JPH06162631A - Magnetic recording/reproducing apparatus - Google Patents

Abstract

PURPOSE:To obtain a VTR which can obtain reproduced images without noise bars even at the time of the trick play. CONSTITUTION:A lower drum Dd with a guiding part G for a reference edge of a magnetic tape is fixedly set to a fixed part DB of the apparatus. The guiding part is kept in the state fitted with the lower drum Dd only in the vicinity of a specific face among the faces orthogonal to the center axis of the lower drum Dd in the inner space of the lower drum Db. A supporting member SA is provided to be freely rotatable by two rotating fulcrums 30, 31 arranged on a line passing the central position of the peripheral face of the drum in the winding range of the magnetic tape within the face in the vicinity of the face including the fitting part and the center axis of the lower drum. An axis of the rotating center of an upper drum is inclined within the face including a line passing the center axis of the lower drum among the lines orthogonal to a line connecting the two rotating fulcrums 30, 31 and the center axis of the Lower drum, so that the position of a plane of the rotating locus of a rotary magnetic head is changed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus, and more particularly to a spatial position of a rotary locus surface of a rotary magnetic head in response to a change in running speed of a magnetic tape which runs while slidingly contacting a part of a peripheral surface of a drum. The present invention relates to a magnetic recording / reproducing device in which a rotary magnetic head can satisfactorily track a recording trace by changing

[0002]

2. Description of the Related Art A magnetic tape wound around a part of a peripheral surface of a drum composed of an upper drum and a lower drum is run at a predetermined running speed, and a recording / reproducing operation is performed by using a rotary magnetic head. A typical example of such a magnetic recording / reproducing apparatus is a video tape recorder (VTR). It is well known that the VTR currently in practical use has been significantly improved in image quality and functions due to the tremendous progress made since its development. In using the VTR, in addition to the normal reproduction (normal reproduction) in which the recording information is reproduced at the same magnetic tape traveling speed as during recording, the traveling is different from the traveling speed or traveling direction of the magnetic tape during recording. Trick play in which a magnetic tape is run (including stop) at a speed or a running direction to perform a reproducing operation is also widely used.

Incidentally, the recording trace pattern (track pattern) recorded and formed on the magnetic tape in correspondence with the rotation locus of the rotary magnetic head is as shown in FIG. 13 as the traveling speed of the magnetic tape is different. Will be different. In FIG. 13, a straight line connecting a portion of the lower edge of the magnetic tape T indicated by the arrow as a starting point and a point indicated by x1 on the upper edge of the magnetic tape and a straight line parallel to the straight line. A large number of straight lines are generated when the reproducing operation is performed by running the magnetic tape at the same running speed and running direction and the same running speed and running direction of the magnetic tape at the time of recording (at the time of normal recording / playback ... normal recording / playback). , A rotation locus of the rotary magnetic head drawn on the magnetic tape T, and FIG.
Each of the straight lines drawn when the positions of the points described as +2, +3 ... +7 in 3 and the starting point are connected in the same direction as the running direction of the magnetic tape T at the time of recording (at the time of recording). The running direction of the magnetic tape T in FIG. 2 is indicated by a + sign)
Rotational magnetic head drawn on the magnetic tape T when the reproducing operation is performed by traveling the magnetic tape T at a traveling speed of 2 times ... 7 times (2 times speed, 3 times speed ... 7 times speed) Will show the rotation trajectory of.

Further, the straight lines connecting the positions of the respective points, such as -2, -3 ...- 7 in FIG. 13 and the starting point, are opposite to the running direction of the magnetic tape T during recording. Direction (the running direction of the magnetic tape T opposite to that during recording is represented by a minus sign), the running speed is twice, three times ... seven times the running speed of the magnetic tape T during recording. , The rotation locus of the rotary magnetic head drawn on the magnetic tape T when the reproducing operation is performed while the magnetic tape T is running. Incidentally, in FIG. 13, the straight line connecting the above-mentioned starting point and the point designated as 0 on the upper edge of the magnetic tape T in the figure was used for the reproducing operation with the magnetic tape T stopped. In the case (still reproduction), the rotation locus of the rotary magnetic head drawn on the magnetic tape T is shown.

When the magnetic recording / reproducing apparatus is constructed so as to be continuously reproducible in the standard mode of the VHS (registered trademark) system, the rotary magnetic head mounted on the rotary drum having a diameter of 62 mm is rotated every minute per minute. When the recording / reproducing operation is performed under the condition that the magnetic tape wound around a part of the outer circumference of the drum is rotated 1800 and is transported at the feeding speed of 33.35 mm / sec, the magnetic tape T is moved by the above-mentioned rotating magnetic head. The recording trace (rotational track of the rotating magnetic head) depicted in Fig. 5 shows an angle of 5 ° 58'9.9 "with respect to the reference edge Te of the magnetic head T (video track when the magnetic tape T is running. The angle is ... 5 ° 5
8′9.9 ″}, and in the VHS (registered trademark) system described above, the video track angle is 5 ° 5 when the magnetic tape T is in the stopped state for reproduction.
6′7.4 ″, and for example, the straight line connecting the position of the point and the starting point described as +7 in FIG. 13 described above is 6 ° with respect to the reference edge Te of the magnetic head T. 10'5
4 "is shown, and, for example, in FIG.
The straight line connecting the position of the point described with reference numeral 7 and the starting point is 5 ° 42′2 with respect to the reference edge Te of the magnetic head T.
It shows an angle of 5.7 ".

As will be apparent from the recording trace pattern illustrated in FIG. 13, the starting point position of the lower edge of the magnetic tape T and the point marked with "1" on the upper edge of the magnetic tape. Recording traces indicated by a straight line connecting the lines and a number of straight lines parallel to the straight line, that is, rotation of the rotary magnetic head drawn on the magnetic tape T by the rotary magnetic head during normal recording / reproducing (normal recording / reproducing). The locus and the rotation locus of the rotary magnetic head drawn on the magnetic tape T by the rotary magnetic head during trick play intersect. Therefore, the signal level of the frequency-modulated wave signal of the reproduction signal reproduced during trick play changes greatly every time the rotary magnetic head crosses the recording mark.
Looking at the envelope of the frequency-modulated wave signal of the reproduction signal in the vertical scanning period, a large undulation occurs in one vertical scanning period. Therefore, as a reproduced image at the time of trick play, only a reproduced image of poor quality in which a noise bar is generated in the image can be obtained. In particular, in the consumer digital VTR, since the data amount of the video signal is compressed and recorded by the high-efficiency encoding method, the rotary magnetic head is used for the magnetic tape T such as during fast-forward reproduction and rewind reproduction. When a playback operation is performed across the recording trace,
An image may not be reproduced at all depending on the arrangement state of the blocks of data arranged in a mosaic pattern.

In order to solve the above-mentioned problems, it suffices that the rotation trace of the rotary magnetic head and the recording trace of the magnetic tape T coincide with each other. As an actuator in an open loop control circuit or a closed loop control circuit, conventionally. A rotary magnetic head is attached to the electro-mechanical conversion element to be used, and the rotary magnetic head is displaced by the electro-mechanical conversion element so that the rotary magnetic head can be traced to the recording trace of the magnetic tape T. Kaihei 3-216849
As disclosed in Japanese Unexamined Patent Publication No. Sho 61-158633 and the like, a rotary drum on which a rotary magnetic head is attached and a lower drum are integrally tilted so that the rotary head traces a recording trace of a magnetic tape T. In addition to proposals for other solutions to enable the above, proposals have been made for digital VTRs such as block arrangement as a pixel unit and improvement of error correction capability.

[0008]

However, in the VTR in which the electro-mechanical conversion element used as an actuator is used to control the rotational locus of the rotary magnetic head as described above, the rotary locus of the rotary magnetic head is controlled. Since the electro-mechanical conversion element for controlling the electro-mechanical conversion element must be provided in a narrow space inside the rotating drum, the electro-mechanical conversion element to be used needs to have a small geometrical size. It is difficult for the electro-mechanical conversion element to give a large displacement to the rotary magnetic head, and the rotary magnetic head displaced by the electro-mechanical conversion element does not cause a poor head touch condition with respect to the magnetic tape even when the rotary magnetic head is displaced. However, a small actuator that exhibits good operating characteristics should be used for good recording and reproducing. It is difficult to configure the VTR to perform the operation.

Further, the magnetic recording disclosed in Japanese Patent Laid-Open No. 3-216849 in which the rotary drum and the lower drum are integrally tilted so that the rotary head can trace the recording trace of the magnetic tape T. In the reproducing apparatus, since the magnetic tape T is running in a state where the position of the reference edge Te of the magnetic tape is not guided by the guide portion at the time of trick play, either during fast-forward reproduction or during rewind reproduction. In the case of, the problem is that the noise bar cannot be completely removed. In addition, 61
In the magnetic tape recording / reproducing apparatus disclosed in Japanese Patent Laid-Open No. 158633, a member for guiding the reference edge of the magnetic tape, which is formed separately from the lower drum, is fixed to the fixing portion of the apparatus, and the rotating magnetic The rotary drum to which the head is attached and the lower drum are integrally tilted so that the rotary head can trace the recording trace of the magnetic tape T. In this device, the reference edge Te of the magnetic tape T is guided. Even if the member is fixed to the fixed part of the device, the magnetic tape T
When the lower drum having the sliding contact surface with the lower drum is inclined integrally with the rotating drum, the magnetic tape T running in the sliding contact surface with the lower drum has the sliding contact surface with the lower drum. In order to incline with the lower drum in the state of sliding contact, the reference edge Te of the magnetic tape T is separated from the member for guiding the reference edge Te of the magnetic tape T by the inclination of the upper and lower drums. When the magnetic tape T is displaced in the direction, the above-mentioned member for guiding the reference edge Te of the magnetic tape T causes the magnetic tape T to run while the reference edge Te of the magnetic tape T is not guided. for,
In case of either fast forward playback or rewind playback,
In addition to the problem that it is impossible to completely remove the noise bar, this is not the case.
In the case where the member for guiding the reference edge of the magnetic tape to be fixed to the fixed portion of the device is formed separately from the lower drum, as in the magnetic tape recording / reproducing device disclosed in Japanese Patent No. 58633. Has problems such as being extremely difficult to manufacture. Furthermore, even if the block arrangement as a unit of pixel in the digital VTR and the error correction capability are improved, a good reproduced image cannot be obtained. So
A solution to the problems mentioned above was sought.

[0010]

According to the present invention, a recording / reproducing operation is performed using a rotating magnetic head on a magnetic tape wound around a part of the peripheral surface of a drum composed of an upper drum and a lower drum. In a magnetic recording / reproducing apparatus, a lower drum having a guide portion for a reference edge of a magnetic tape on an outer peripheral surface is fixed to a fixed portion of the apparatus, and a rotary magnetic head is provided in an inner space portion of the lower drum. A support member having a bearing portion for a rotating shaft for rotating a member attached to is fitted to the lower drum only near a specific surface of the above-mentioned surfaces orthogonal to the central axis of the lower drum. A straight line that passes through the central position of the winding range of the magnetic tape with respect to the peripheral surface of the drum and the central axis of the lower drum, and is in a plane orthogonal to the central axis of the lower drum. The straight line in the first reference direction Rotation of the rotary magnetic head described above with a straight line that is orthogonal to both the straight line in the first reference direction and the central axis of the lower drum and that passes through the central axis of the lower drum as the straight line in the second reference direction. In order to change the inclination mode of the trajectory surface, the rotation configured on the straight line in the first reference direction in the plane in the vicinity of the specific plane where the lower drum and the support member are fitted to each other. When the support member is rotated about a fulcrum as a rotation center, the rotation axis is tilted within a plane including the straight line in the second reference direction and the center axis of the lower drum. A magnetic recording / reproducing device in which the supporting member is elastically coupled and supported to a fixed part of the device, or a magnetic tape wound around a part of the peripheral surface of a drum composed of an upper drum and a lower drum, Magnets for recording / reproducing operations using a rotating magnetic head. In the recording / reproducing apparatus, a lower drum having a guide portion for the reference edge of the magnetic tape on the outer peripheral surface is fixed to a fixed portion of the apparatus, and the inner space portion of the lower drum has a drum drive motor The rotor is integrally fixed, and the fixed shaft for fixing the rotation center position of the upper drum is fixed by fitting the bearing fixed to the upper drum to which the rotary magnetic head is attached. The support member is provided in a state of being fitted to the lower drum only near a specific surface of the surface orthogonal to the central axis of the lower drum, and the magnetic tape winding range of the peripheral surface of the drum is set. A straight line passing through the central position and the central axis of the lower drum and lying in a plane orthogonal to the central axis of the lower drum is defined as a straight line in the first reference direction. The line between the straight line and the center axis of the lower drum In order to change the inclination mode of the rotation locus surface of the rotary magnetic head, a straight line that is orthogonal to this direction and that passes through the central axis of the lower drum is used as a straight line in the second reference direction. When the support member is rotated about a rotation fulcrum formed on a straight line in the first reference direction in a plane in the vicinity of a specific plane in which the member is fitted, The support member is fixed to the fixing portion of the apparatus so that the fixed shaft for determining the rotation center position of the upper drum can be tilted in a plane including the straight line in the second reference direction and the central axis of the lower drum. A magnetic recording / reproducing device elastically coupled to and supported by a magnetic recording / reproducing device, and a magnetic recording / reproducing device having means for variably adjusting the inclination of the rotating shaft or the fixed shaft in the magnetic recording / reproducing device. Magnetic recording A magnetic recording / reproducing apparatus having means for changing the inclination of the rotating shaft or the fixed shaft in the reproducing apparatus in correspondence with the running speed of the magnetic tape, and in the magnetic recording / reproducing apparatus described above, the center axis of the lower drum is rotated. An annular cam member is disposed between the fixed portion of the device and the support member in a manner such that the cam member can be rotated about the center of motion, and the cam member is configured in the circumferential direction. The fixing portion of the device, the support member, and the cam member are elastically connected so that the cam contour and the cam follower provided on the support member are in pressure contact with each other, and when the annular cam member is rotated. A magnetic recording / reproducing device which is orthogonal to a straight line connecting the two rotation fulcrums and has tilt adjusting means for changing the tilt of the rotary shaft or the fixed shaft in a plane including the central axis of the lower drum. apparatus To provide.

[0011]

Since the lower drum is fixed to the fixed portion of the apparatus, a part of the peripheral surface of the drum composed of the upper drum and the lower drum is provided regardless of the reproducing mode of the magnetic recording / reproducing apparatus. The magnetic tape in a wound state is made to run or stopped on the peripheral surface of the drum while being guided by the guide portion with respect to the reference edge of the magnetic tape provided on the outer peripheral surface of the lower drum. . A support member having a bearing portion of a rotary shaft for rotating the member to which the rotary magnetic head is attached is provided in the inner space portion of the lower drum fixed to the fixing portion of the apparatus as described above. It is in a state of being fitted to the lower drum only near a specific surface of the surface orthogonal to the central axis of the lower drum, and the peripheral surface of the drum is in the surface near the surface including the fitting portion. The support member is rotatably provided by two rotation fulcrums which are formed on a straight line passing through the center position of the winding range of the magnetic tape with respect to By rotating about a straight line connecting the two rotation fulcrums as a rotation center, a straight line passing through the center axis of the lower drum and a center axis of the lower drum among the straight lines orthogonal to the line connecting the two rotation fulcrums By tilting the rotation axis in the plane containing By changing the position of the rotation locus surface of the head, it is possible to cause the rotary magnetic head to be satisfactorily track recording track of the magnetic tape.

Further, the rotor of the drum driving motor is integrally fixed, and a bearing fixed to the upper drum to which the rotary magnetic head is attached is fitted to determine the rotation center position of the upper drum. In the inner space of the lower drum in which the supporting member having the fixed shaft to be fixed is fixed to the fixing portion of the device as described above, the specific inside of the plane orthogonal to the central axis of the lower drum is specified. The lower drum is fitted to the lower drum only near the upper surface, and the center position of the winding range of the magnetic tape with respect to the peripheral surface of the drum and the lower drum in the surface near the surface including the fitting portion described above. Since it is rotatably provided by two rotation fulcrums that are formed on a straight line that passes through the central axis of the rotation axis, the support member is rotated about a straight line that connects the two rotation fulcrums. Move it, 2 above
A rotation locus of the rotary magnetic head by inclining the rotation axis in a plane that includes the straight axis that passes through the central axis of the lower drum and the straight axis that is orthogonal to the straight line that connects the two rotation fulcrums. It is possible to change the position of the surface so that the rotary magnetic head can satisfactorily follow the recording trace of the magnetic tape.

Further, by changing the inclination of the rotating shaft or the fixed shaft in accordance with the running speed of the magnetic tape, a reproduced image without a noise bar is obtained regardless of the running speed of the magnetic tape. be able to. As a mechanism for changing the position of the rotation locus surface of the rotary magnetic head by the inclination of the rotary shaft or the fixed shaft described above, a mechanism is adopted in which the center axis of the lower drum can be rotated. An annular cam member is disposed between the fixed portion of the device and the support member, and the cam contour of the cam member formed in the circumferential direction and the cam follower provided on the support member are pressed against each other. Since the fixing portion of the above-mentioned device, the supporting member and the cam member are elastically connected to each other so as to be in the state, the two rotations of the annular cam member are performed. It is possible to precisely and easily change the inclination angle of the rotary shaft or the fixed shaft in a plane orthogonal to the straight line connecting the fulcrums and including the central axis of the lower drum.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The specific contents of the magnetic recording / reproducing apparatus of the present invention will be described in detail below with reference to the accompanying drawings. 1 and 14 are perspective views of a magnetic recording / reproducing apparatus of the present invention, FIG. 2 is a plan view of a drum, and FIGS. 3, 7, 11, 11 and 17 and 21 are magnetic recording / reproducing of the present invention. Figures used for explaining the constitutional principle and operation principle of the apparatus, FIG. 4, FIG. 6, FIG. 9, FIG. 10, FIG. 12, FIG. 15, FIG. 18 to FIG. FIGS. 5, 5 and 16 are exploded perspective views of essential parts, FIG. 8 is a view for explaining a cam member for adjusting the inclination of the rotary shaft, and FIG. 13 is a plan view showing a recording mark pattern. 1 and 14 are perspective views of different embodiments of the magnetic recording / reproducing apparatus of the present invention. 1 and 14, DB is a drum base, and a lower drum Dd in a drum structure DA including an upper drum Du and a lower drum Dd is fixed to the drum base DB. The drum structure DA to be used in implementing the magnetic recording / reproducing apparatus of the present invention is the upper drum Du thereof.
Can be used either as a rotating upper drum (rotating drum) or as a non-rotating upper drum, and either configuration can be used. In the drum structure DA in (1), an example in which the upper drum Du thereof is configured as a rotating drum is shown. Needless to say, even if the upper drum does not rotate, a member for rotating the rotary magnetic head is provided.

1 and 14, Ha is a rotary magnetic head attached to the upper drum Du. S in the figure
The rotary magnetic head Ha is shown in which the P head and the EP head are arranged adjacent to each other. In addition, the upper drum (rotating drum) Du has 18
A rotary magnetic head Hb (see, for example, FIG. 4) is attached at a position of 0 degree symmetry. The magnetic heads to be attached to the upper drum Du are the rotary magnetic heads Ha and Hb described above.
It goes without saying that it is not limited to this. As described above, the lower drum Dd fixed to the drum base DB that functions as a part of the fixed portion of the magnetic recording / reproducing apparatus has the reference edge Te (see FIG. 13) of the magnetic tape T on the outer peripheral surface thereof. The guide portion G for controlling the position of the magnetic recording / reproducing apparatus is provided, and the magnetic recording / reproducing apparatus is wound around a part of the peripheral surface of the drum, that is, the upper drum Du and the lower drum Dd, regardless of the reproduction mode. The magnetic tape of No. 2 is provided by the guide portion G provided on the outer peripheral surface of the lower drum Dd with respect to the reference edge of the magnetic tape
The reference edge Te of the drum is made to travel or stop on the peripheral surface of the drum while being reliably guided.

In the magnetic recording / reproducing apparatus of the present invention, a part of the outer peripheral surface of the lower drum Dd fixed to the drum base DB that functions as a part of the fixing portion of the apparatus as described above, and the lower drum. The magnetic tape T is wound around a part of the outer peripheral surface of the upper drum Du which constitutes the drum structure DA together with Dd. Needless to say, the outer diameters of the sliding contact portions of the magnetic tape T on both the drums Dd and Du are the same. 2 is a plan view of the drum structure DA showing a state in which the magnetic tape T is wound around a part of the outer peripheral surface of the drum.
Reference numerals 6 and 27 denote inclined poles used as a part of a mechanism for loading the magnetic tape T on the drum surface of the drum structure DA. The magnetic tape T is wound around the outer peripheral surface of the drum of the drum structure DA in a range corresponding to an angle slightly larger than 180 degrees at the center angle of the drum.

In FIG. 2, O indicates the position of the central axis of the lower drum Dd in the drum structure DA, and 90 in the figure.
The degree position is the center position of the winding range of the magnetic tape with respect to the peripheral surface of the drum, and the straight line L1 shown in FIG. 2 is the center position of the winding range of the magnetic tape with respect to the peripheral surface of the drum and the lower drum. The first straight line L1 connecting the position O of the central axis of Dd (the same as the straight line connecting the 90-degree position and the 270-degree position), and the straight line L2 shown in FIG. The lower drum D within the straight line orthogonal to the straight line L1 of 1
It is a straight line passing through the position O of the central axis of d. In the magnetic recording / reproducing apparatus of the present invention, the lower drum Dd
Is fixed to the drum base DB which functions as a part of the fixing portion of the apparatus as described above, the position of the central axis of the lower drum Dd is always shown as a straight line 0-0 in FIG. Is held in place.

In the embodiment of the magnetic recording / reproducing apparatus of the present invention shown in FIG. 1, the upper drum Du, which functions as a member to which the magnetic heads Ha and Hb are attached, is the upper drum D.
The supporting member SA including the bearing portions 5 and 6 of the rotary shaft 1 of the drum drive motor Md for rotating u (see FIGS. 4 and 5).
Is a ring-shaped cam member (annular cam member) CA for tilt adjustment of the rotary shaft, which functions as tilt adjustment means of the rotary shaft.
(See FIG. 4 and FIG. 5)
When tilted in the inner space of, the position of the central axis of the upper drum Du is, for example, the position shown by the one-dot chain line in FIG. 3 (during rewind reproduction operation) and the position shown by the dotted line (during fast-forward reproduction operation). Changes between and. Further, in the embodiment of the magnetic recording / reproducing apparatus of the present invention shown in FIG. 14, the rotor 92 of the drum drive motor DM with respect to the upper drum Du that functions as a member to which the magnetic heads Ha and Hb are attached.
(See FIG. 15) is fixed by screws 103 and 104, and the upper drum Du has a fixed shaft 99 fixed to the bearing portions 93 and 94 fixed to the upper drum Du. (See FIGS. 15 and 16) is an annular cam member (annular cam member) CA for adjusting the inclination of the rotating shaft that functions as the inclination adjusting means of the rotating shaft (see FIGS. 15 and 16).
By tilting in the inner space of the lower drum Dd in cooperation with the position of the central axis of the upper drum Du, the position of the center axis of the upper drum Du is, for example, the position shown by the alternate long and short dash line in FIG. 3 (during rewinding reproduction operation).
And the position indicated by the dotted line (during fast-forward reproduction operation). In FIG. 14, reference numeral 95 denotes a drum motor mounting board, and the drum motor mounting board 95 is mounted on the mounting member 106 with screws 96 and 97. Reference numeral 98 is a connector.

The above-mentioned support member SA provided in the inner space of the lower drum Dd fixed to the drum base DB which functions as a fixing portion of the apparatus is provided on the surface orthogonal to the central axis of the lower drum Dd. Lower drum D only near a specific surface inside
The center position of the winding range of the magnetic tape T with respect to the circumferential surface of the drum and the central axis of the lower drum Dd in the plane near the plane including the above-mentioned fitting portion while being fitted to the d. 2 constructed on a straight line passing through (the straight line L1 in FIG. 2)
It is made rotatable by one rotation fulcrum, and the support member SA is a straight line connecting the two rotation fulcrums (see FIG. 2).
The straight line L1) in the center of rotation
In the plane including the straight line connecting the two rotation fulcrums (straight line L1 in FIG. 2) and passing through the central axis of the lower drum (the straight line L2 in FIG. 2) and the central axis of the lower drum, The rotating shaft 1
Is tilted, the positions of the rotational locus surfaces of the rotary magnetic heads Ha and Hb attached to the upper drum Du change, so that the rotary magnetic heads Ha and Hb can be satisfactorily traced to the recording traces of the magnetic tape T. It becomes possible.

First, the magnetic recording / reproducing apparatus of one embodiment of the present invention shown in FIG. 1 will be described. A longitudinal sectional view of a part of the magnetic recording / reproducing apparatus of the present invention shown in FIG.
2A is a cross-sectional view of the drum structure DA at the 90-270 degree line position in FIG. 2, and FIG. 4B is 0 ° -1 in FIG.
In the sectional view of the drum structure DA at the 80-degree line position}, the lower drum Dd having the guide portion G of the reference edge of the magnetic tape formed on the outer peripheral surface serves as the drum base DB that functions as a fixed portion in the magnetic recording / reproducing apparatus. On the other hand, it is fixed by a plurality of screws 32 (only one screw 32 is shown in FIG. 4, but three screws 32 are shown in the exploded perspective view shown in FIG. 5). . Lower drum D described above
The support member SA provided in the inner space portion formed inward of d has an edge portion 28 protruding from the outer peripheral surface of its upper end portion, that is, the diameter of the inner wall surface of the lower drum Dd. An edge portion 28 configured to have the same diameter as is fitted to the inner wall surface of the lower drum Dd.

The magnetic tape T on the peripheral surface of the drum
Of the support member SA and the lower drum Dd at two positions located on a straight line (a straight line L1 in FIG. 2) passing through the center position of the winding range of the lower drum Dd and the central axis of the lower drum Dd. The members 30 and 31 are rotatably connected. In the embodiment illustrated in FIG. 4, a straight line passing through the center position of the winding range of the magnetic tape T with respect to the peripheral surface of the drum and the central axis of the lower drum Dd (the straight line L1 in FIG. 2).
The rotation fulcrums are formed by the above-described rotation fulcrums members 30 and 31 between the upper end portion of the support member SA at the upper position and the projecting edge 29 provided on the lower drum Dd.

2 which is formed between the lower drum Dd and the supporting member SA by the above-mentioned members 30 and 31 for rotating fulcrums.
The surface including the individual rotation fulcrums and the fitting surface between the edge portion 28 projecting from the outer peripheral surface of the upper end portion of the support member SA and the inner wall surface of the lower drum Dd are extremely close to each other, and The surface including the two rotation fulcrums formed between the lower drum Dd and the support member SA by the above-described rotation fulcrums members 30 and 31 is close to the rotation locus surfaces of the rotary magnetic heads Ha and Hb. Therefore, the support member SA is rotated about the straight line connecting the two rotation fulcrums (the straight line L1 in FIG. 2) as a rotation center, and the straight line connecting the two rotation fulcrums (FIG. The straight line L1) in 2 and the straight line passing through the central axis of the lower drum (the straight line L2 in FIG. 2) and the central axis of the lower drum are inclined in the plane including the central axis of the lower drum. Even in this case, the rotation trajectory of the rotary magnetic heads Ha and Hb is larger than the position of the extension surface of the outer peripheral surface of the lower drum Dd. Destroyed it without, therefore, is inclined rotary shaft 1 by rotating the pivot point that the support member SA by rotary magnetic head H
Even if the rotation loci of a and Hb are changed, the rotating magnetic head H
A good reproduced image can always be obtained without deteriorating the contact state between the magnetic gap portions of a and Hb and the magnetic tape T.

In FIG. 4, a member CA provided between the drum base DB and the supporting member SA is a lower drum D.
Between the d and the supporting member SA, the above-mentioned member 3 for rotation fulcrum is provided.
An annular cam member CA used to rotate the support member SA in a predetermined manner with a straight line (a straight line L1 in FIG. 2) connecting two rotation fulcrums constituted by 0 and 31 as a rotation center. Yes, and a specific configuration example thereof is shown in FIG. As shown in FIG. 5G, the drum base DB has an annular portion 3 of the annular cam member CA.
4 is provided with a guide groove 33 into which the annular cam member CA is fitted into the guide groove 33 provided in the drum base DB, and an annular portion 34 thereof is rotatably fitted. Positioned by The annular portion 34 of the annular cam member CA described above is provided with cam contours 34a and 34b having a predetermined shape.

The circular rack 34 is provided with an arcuate rack 22 via a connecting portion 35. The support member SA and the annular cam member CA are elastically connected to and supported by the drum base DB that functions as a fixing portion of the apparatus by the bias of the springs 38 to 41. The above-mentioned springs 38 and 39 are shown in FIG.
, The holes 44 and 45 provided in the drum base DB and the holes 46 and 47 provided in the support member SA are shown in FIG.
And the springs 40,
41 is holes 48, 4 provided in the drum base DB
9 and holes 50 and 51 provided in the drum motor mounting board 7.

On the arcuate rack 22 of the above-mentioned annular cam member CA, as shown in FIG. 1, the rotational force of the motor Mg is reduced by the speed reducer 19, the rotary shaft 20, and the pinion 21.
And the annular portion 34 of the annular cam member CA is fitted into the guide groove 33 provided in the drum base DB in accordance with the forward / reverse rotation of the motor. When the support member SA is rotated in the state, the support member SA is lowered by the followers 36 and 37 provided on the support member SA engaged with the predetermined-shaped cam contours 34a and 34b formed on the annular portion 34. Between the drum Dd and the support member SA, a straight line connecting the two rotation fulcrums constituted by the above-mentioned rotation fulcrums members 30 and 31 (a straight line L1 in FIG. 2).
The center of rotation of the rotary magnetic heads Ha and Hb changes the position of the rotary magnetic heads Ha and Hb.

A rotary shaft 1 of a drum drive motor Md for driving and rotating the upper drum Du is rotatably supported by bearings 5 and 6 provided on a support member SA. Figure 4
Drum drive motor M shown in longitudinal section inside
d is shown as having an outer rotor type structure, and an annular permanent magnet 14 is fixed to a support plate 8 of the permanent magnet.
It is fixed to the shaft fixing member 11 by 10. The shaft fixing member 11 is fixed to the rotating shaft 1 by a set screw after the rotating shaft 1 is fitted in the center hole thereof. The stator mounting member provided with the stator coils 15 to 18 is fixed to the drum motor mounting substrate 7 and the supporting member SA by screws 12 and 13. Further, the drum motor mounting substrate 7 and the supporting member SA are the screws 4 of FIG.
It is also fixed by 2, 43.

Bearings 5 and 6 provided on the support member SA
The rotary shaft 1 rotatably supported by the upper drum fixing member 2 is fitted and fixed to the upper drum fixing member 2, and the upper drum Du is fixed to the upper drum fixing member 2 by screws 3 and 4. Md rotates the upper drum Du by the rotating shaft 1. Reference numeral 23 is a rotary transformer on the side of the upper drum Du, and 24 is a rotary transformer on the side of the support member SA. Even if the rotating shaft 1 is tilted due to the rotation of the, the gap between the two is kept constant.

The motor M shown in FIGS. 1 and 14.
g is a power source motor of a drive mechanism used when changing the amount of rotation of the support member SA, that is, the amount of inclination of the rotary shaft 1, and this motor Mg is operated by a drive control circuit (not shown). Controlled, the above-mentioned motor Mg
Is transmitted to the cam member (annular cam member) CA for adjusting the inclination of the rotary shaft via the speed reducer 19, the rotary shaft 20, the pinion 21, and the arcuate rack 22. Reference numeral 25 denotes a rotation position detecting device (for example, photo interrupter) of the annular cam member CA, and the rotation position detecting device 25 of the annular cam member CA is fixed to the drum base DB. Detection device 2 in the above-mentioned annular cam member CA
Reference numeral 5 denotes through holes 52 to 54 for position detection, which are provided at specific positions of the arcuate rack 22 in the annular cam member CA.
A position detection signal is generated corresponding to (see FIG. 5).

The position detection signal is used to control the operation of the drive control circuit. Further, in the rotation position detecting device 25 of the annular cam member CA described above, the through holes 55 to 57 for stoppers provided at the specific positions of the arcuate rack 22 in the annular cam member CA (see FIG. 5). ) Is also provided. As the stopper mechanism, for example, a structure having a ball urged by a spring can be used, and a stopper transparent member provided at a specific position of the arcuate rack 22 in the annular cam member CA described above. Selected one of holes 55-57
By engaging the ball in the stopper mechanism with the individual one, the rotational position of the annular cam member CA, that is, the inclination mode of the rotary shaft 1 can be set.

FIG. 7 shows the structure of the rotary shaft which functions as the tilt adjusting means of the rotary shaft as described above in the components near the drum structure DA of the embodiment of the magnetic recording / reproducing apparatus of the present invention shown in FIG. When the annular cam member (annular cam member) CA for tilt adjustment is rotated, the annular cam member CA
Support member SA having cam followers 36, 37 which are in pressure contact with the cam contours 34a, 34b configured in the circumferential direction of
Is rotated about a straight line (a straight line L1 in FIG. 2) connecting the two rotation fulcrums constituted by the two rotation fulcrums members 30 and 31 and is thereby provided on the support member SA. Shaft 1 supported by bearings 5 and 6
Is a straight line that passes through the central axis of the lower drum (a straight line L2 in FIG. 2) that is orthogonal to the straight line that connects the two pivots (the straight line L1 in FIG. 2) and the central axis of the lower drum. 7A is a diagram illustrating a state in which the position of the rotation locus surface of the rotary magnetic heads Ha and Hb attached to the upper drum Du is changed by inclining in a plane including FIG. , (D),
(G) is similar to the longitudinal sectional view shown in (b) of FIG. 4, and is the position along the line AA in FIG.
It is a sectional view of drum structure DA in a 0 degree line position.

The line 0-0 in the sectional view in the vicinity of the drum structure DA shown in each of FIGS. 7A, 7D, and 7G is
As described above, the position of the central axis of the lower drum Dd fixed to the drum base DB that functions as a part of the fixing portion of the apparatus (the same as the position of the straight line 0-0 in FIG. 3) is shown. .
In FIG. 7A, the rotary shaft 1 is brought into a state where it coincides with the central axis of the lower drum Dd (state during normal reproduction).
An annular cam member for adjusting the inclination of the rotating shaft (annular cam member)
It is the figure which shows the state where CA is turning adjusted,
FIG. 7B is a plan view of the ring-shaped cam member CA showing the state of rotation adjustment of the ring-shaped cam member CA at the time of the normal reproduction, and the straight lines L1 and L2 in the drawing are shown in FIG. It corresponds to the straight lines L1 and L2 shown in FIG. Also, FIG.
7C is a side view of the annular cam member CA corresponding to the plan view of the annular cam member CA during the normal reproduction {(b) of FIG. 7}.

FIG. 7D is a sectional view of the vicinity of the drum structure DA when the magnetic recording / reproducing apparatus is performing the fast-forward reproducing operation. In this case, the rotary shaft 1 is shown in FIG. 3B. It is in a state of being inclined in the inclination direction as shown by the dotted line. FIG. 7 (e) is a plan view of the annular cam member CA showing the state of rotation adjustment when the magnetic recording / reproducing apparatus is performing the fast-forward reproducing operation as described above, and the straight lines L1 and L2 in the figure are Straight line L shown in FIG.
1 and L2, and FIG. 7 (f) is a plan view of the annular cam member CA when the magnetic recording / reproducing apparatus is performing the fast-forward reproducing operation as described above (see FIG. 7).
It is a side view of the annular cam member CA corresponding to (e)}. 7 (g) is a cross-sectional view of the vicinity of the drum structure DA when the magnetic recording / reproducing apparatus is performing the rewinding reproducing operation, and the rotary shaft 1 in this case is shown in FIG. 3 (b). It is in a state of being inclined in the inclination direction as shown by the alternate long and short dash line. FIG. 7 (h) is a plan view of the annular cam member CA showing the state of rotation adjustment when the magnetic recording / reproducing apparatus is performing the rewinding reproducing operation as described above. 2 corresponds to the straight lines L1 and L2 shown in FIG. 2, and (i) of FIG. 7 shows an annular cam when the magnetic recording / reproducing apparatus is performing the rewinding reproducing operation as described above. FIG. 8 is a side view of the annular cam member CA corresponding to the plan view of the member CA {(h) of FIG. 7}.

The setting of the reproducing operation mode in the magnetic recording / reproducing apparatus of the present invention is performed by the operator inputting the operation mode information to the operating section of the magnetic recording / reproducing apparatus. When the reproduction operation mode is changed to the normal reproduction mode, the fast-forward reproduction mode, or the rewind reproduction mode, the cam member CA for adjusting the inclination of the rotating shaft corresponds to the change of the reproduction mode. Is required to be accurately rotated to a predetermined rotation position selected on the drum base DB, and then to be fixed in that position, which is as described above. Motor Mg provided in DB,
The power of the motor is applied to the arc-shaped rack 22 provided on the cam member CA (see FIG. 5) for adjusting the inclination of the rotary shaft via the speed reducer 19, the rotary shaft 20, and the pinion 21 (see FIG. 1). By transmitting the circular cam member CA, which is rotatably fitted in the guide groove 33 provided in the drum base DB, to the selected predetermined rotation position, the selection is performed. The annular cam member CA is fixed at the specified rotation position by using, for example, the click stop mechanism as described above.

When the reproduction operation mode set by the operator with respect to the above-mentioned operation section is, for example, the normal reproduction mode, the above-described motor Mg, decelerator 19, and rotary shaft 20 are used in the control device (not shown). , Pinion 21 (Fig. 1
(See FIG. 5), the arc-shaped rack 22 provided on the cam member CA (see FIG. 5) for adjusting the inclination of the rotary shaft,
When the power of the motor is transmitted to rotate the annular cam member CA rotatably fitted in the guide groove 33 provided in the drum base DB, the circumference of the annular cam member CA is A support member SA having cam followers 36, 37 in pressure contact with the cam contours 34a, 34b arranged in the direction
2 composed of two members 30 and 31 for turning fulcrums
The rotary shaft 1 supported by the bearings 5 and 6 provided on the support member SA by rotating about a straight line connecting the two rotary fulcrums (a straight line L1 in FIG. 2) as a rotary center,
When the state coincides with the central axis of the lower drum Dd, the normal positions in the through holes 52 to 54 (see FIG. 5) for position detection, which are provided at specific positions of the arcuate rack 22 of the annular cam member CA, are set. A position detection signal is generated corresponding to the through hole 53 for the reproduction mode, the operation of the drive control circuit is controlled by the position detection signal, the rotation of the motor Mg is stopped, and the annular cam member CA described above is used. The ball urged by the spring in the stopper mechanism provided in the rotation position detecting device 25 of FIG. 2 is a through hole for a stopper provided in a specific position of the arcuate rack 22 in the annular cam member CA described above. Engage 56,
The above-mentioned annular cam member CA is fixed by the above-mentioned click stop mechanism at a specific rotational position determined corresponding to normal reproduction.

Next, when the reproduction operation mode set by the operator for the above-mentioned operation section is, for example, the fast-forward reproduction mode, the above-described motor Mg, decelerator 19, Rotating shaft 20, pinion 21
(See FIG. 1), through the cam member CA for adjusting the inclination of the rotary shaft.
An annular cam that transmits the power of the motor to an arc-shaped rack 22 provided in (see FIG. 5) and is rotatably fitted in a guide groove 33 provided in the drum base DB. When the member CA is rotated, the annular cam member C
Support member SA having cam followers 36, 37 in pressure contact with cam contours 34a, 34b configured in the circumferential direction of A
Is provided on the support member SA by rotating about a straight line (a straight line L1 in FIG. 2) connecting the two rotation fulcrums constituted by the two rotation fulcrums members 30 and 31 as a rotation center. Rotating shaft 1 supported by bearings 5 and 6
However, when it is in a state of being tilted by a specific angle in the tilt direction as shown by the dotted line in FIG. 3B, the detection device (for example, photo interrupter) 25 of the rotational position of the annular cam member CA is , A through hole 52 for position detection provided at a specific position of the arcuate rack 22 in the annular cam member CA.
54 (see FIG. 5) through hole 54 for fast-forward playback mode
A position detection signal is generated in response to the above, and the operation of the drive control circuit is controlled by the position detection signal to control the motor Mg.
When the rotation of the circular cam member CA is stopped, the ball urged by the spring in the stopper mechanism provided in the detection device 25 of the rotational position of the circular cam member CA described above has an arc shape in the circular cam member CA. Through holes 57 for stoppers provided at specific positions of the rack 22
(See FIG. 5), the above-mentioned annular cam member CA is fixed by the click-stop mechanism at a specific rotational position determined in correspondence with the fast-forward reproduction mode.

Next, when the reproduction operation mode set by the operator with respect to the above-mentioned operation section is, for example, the rewinding reproduction mode, the above-mentioned motor Mg, decelerator 19, Rotating shaft 20, pinion 21
(See FIG. 1), through the cam member CA for adjusting the inclination of the rotary shaft.
An annular cam that transmits the power of the motor to an arc-shaped rack 22 provided in (see FIG. 5) and is rotatably fitted in a guide groove 33 provided in the drum base DB. When the member CA is rotated, the annular cam member C
Support member SA having cam followers 36, 37 in pressure contact with cam contours 34a, 34b configured in the circumferential direction of A
Is provided on the support member SA by rotating about a straight line (a straight line L1 in FIG. 2) connecting the two rotation fulcrums constituted by the two rotation fulcrums members 30 and 31 as a rotation center. Rotating shaft 1 supported by bearings 5 and 6
However, when it is inclined by a specific angle in the inclination direction as shown by the one-dot chain line in FIG. 3B, a detecting device (for example, photo interrupter) 25 of the rotational position of the annular cam member CA is provided. Is a through hole 5 for position detection provided at a specific position of the arcuate rack 22 in the annular cam member CA.
2 to 54 (see FIG. 5) generate a position detection signal corresponding to the through hole 52 for the rewinding reproduction mode, and the operation of the drive control circuit is controlled by the position detection signal to stop the rotation of the motor Mg. At the same time, the ball urged by the spring in the stopper mechanism provided in the detection device 25 for detecting the rotational position of the annular cam member CA identifies the arcuate rack 22 on the annular cam member CA. Through hole 55 for stopper provided at various positions
(See FIG. 5), the annular cam member CA is fixed by the click stop mechanism to a specific rotation position determined in correspondence with the rewinding reproduction mode.

FIG. 8 shows an example of the structure of an annular cam member CA which is rotated in a state where it is fitted in the guide groove 33 provided in the drum base DB and is used in a state where it is positioned at a predetermined rotation position. FIG. 8A is a perspective view of a part of the annular cam member CA, and O in the drawing indicates the center point of the annular portion 34 of the annular cam member CA. In the annular portion 34 of the annular cam member CA, the straight lines Lf2, Lf1, passing through the center point of the annular body 34 described above are provided on both sides of the 90 ° -270 ° line shown in the drawing. Located on Ln, Lb1, Lb2,
Each pair of different cam contours 60 to 69 is configured. FIG. 8B shows the cam contour 6 formed in a part of the annular portion 34 of the annular cam member CA.
It is a side view of the ring-shaped part 34 in the ring-shaped cam member CA which illustrates the structural aspect of 1,63,65,67,69, and is -x11, -x5, 0, + shown in the figure. ×
In the display of 5, + × 11, etc., 0 indicates a cam outline for normal reproduction, − sign indicates rewind (FB) reproduction, and + sign indicates fast forward (FF). ) Indicates reproduction, and x5 indicates 5 times the magnetic tape speed during normal reproduction, and x11 indicates 11 times the magnetic tape speed during normal reproduction. .

FIG. 8C shows the cam profile 60 as described above.
To 69 are used in the annular portion 34, the cam followers 36 of the support member SA are attached to the cam contours 60 to 69 formed in the circumferential direction of the annular cam member CA.
37 is pressed to rotate the support member SA about a straight line (a straight line L1 in FIG. 2) connecting the two rotation fulcrums constituted by the two rotation fulcrums members 30 and 31. At this time, the rotary shaft 1 supported by the bearings 5 and 6 provided on the support member SA is a straight line orthogonal to the straight line (the straight line L1 in FIG. 2) connecting the two rotation fulcrums. The upper drum D is inclined in a plane including the straight line passing through the central axis of the lower drum (the straight line L2 in FIG. 2) and the central axis of the lower drum.
FIG. 7 is a diagram illustrating and explaining a state in which the position of the rotation trajectory surface of the rotary magnetic heads Ha and Hb attached to u is changed. Note that, as illustrated in FIG. 8, the cam contours 60 to 69
Since the rotational driving operation for the cam member CA when the annular cam member CA provided in the annular portion 34 is used can be easily inferred from what has already been described with reference to FIGS. 1 and 7. The detailed description is omitted here.

FIG. 6 shows how the support member SA and the lower drum Dd are fitted in the drum structure DA of the embodiment of the magnetic recording / reproducing apparatus of the present invention described with reference to FIG. 4 and the lower drum Dd. The lower drum D in the drum structure DA of another embodiment of the magnetic recording / reproducing apparatus of the present invention, which is configured differently from the supporting mode for rotatably supporting the supporting member SA.
FIG. 7 is a vertical cross-sectional view showing a related configuration of a portion d and a portion of the supporting member SA, and FIG. 6A is a configuration including a lower drum Dd portion and a supporting member SA portion of the drum structure DA. FIG. 6 shows a cross-sectional view of the portion at a position corresponding to the 90-270 degree line position in FIG.
(B) shows a cross-sectional view of a portion of the drum structure DA including the lower drum Dd and the support member SA at a position corresponding to the 0 ° -180 ° line position in FIG. 2. .

The lower drum D in the drum structure DA of another embodiment of the magnetic recording / reproducing apparatus of the present invention shown in FIG.
In the vertical cross-sectional view showing the related configuration of the portion d and the portion of the supporting member SA, the lower drum Dd having a guide portion G of the reference edge of the magnetic tape on the outer peripheral surface is fixed in the magnetic recording / reproducing apparatus. A plurality of screws 32 (only one screw 32 is shown in FIG. 6) are fixed to the drum base DB functioning as a part. An edge 58 protruding inward is provided at the upper end of the lower drum Dd described above, and the tip of the edge 58 is provided in an inner space formed inside the lower drum Dd. It is fitted on the outer wall surface of the supporting member SA. That is, the edge portion 58 projecting inwardly from the upper end portion of the lower drum Dd is configured such that the inner diameter dimension thereof is the same as the diameter of the outer wall surface of the support member SA. Further, the support member SA described above is provided at two positions located on a straight line (a straight line L1 in FIG. 2) passing through the center position of the winding range of the magnetic tape T with respect to the peripheral surface of the drum and the central axis of the lower drum Dd. And the lower drum Dd are members 30 and 31 for rotation fulcrums.
It is rotatably connected by. In the embodiment illustrated in FIG. 6, a position on a straight line (a straight line L1 in FIG. 2) passing through the central position of the winding range of the magnetic tape T with respect to the peripheral surface of the drum and the central axis of the lower drum Dd. A rotation fulcrum is formed by the above-described rotation fulcrums members 30 and 31 between the upper end of the lower drum Dd and the lower surface of the protrusion 70 provided on the support member SA.

2 which is formed between the lower drum Dd and the support member SA by the above-described members 30, 31 for rotating fulcrums.
The surface including the individual rotation fulcrums and the fitting surface between the edge 58 projecting inward from the upper end of the lower drum Dd and the outer wall surface of the support member SA are extremely close to each other. A surface including two rotation fulcrums formed between the lower drum Dd and the support member SA by the above-described rotation fulcrums members 30 and 31,
The rotational locus surfaces of the rotary magnetic heads Ha and Hb (not shown) are the outer peripheral surface 70 of the protrusion 70 provided on the support member SA.
The upper drum Du (not shown), which is separated by the length in the generatrix direction a, is fixed to the rotary shaft 1 supported by the bearings 5 and 6 provided on the support member SA. The size of the gap formed between the lower end and the upper end of the support member SA (or the distance between the upper end of the support member SA and the rotation locus surfaces of the rotary magnetic heads Ha and Hb fixed to the upper drum) is , Even when the support member SA is rotated by the two rotation fulcrums constituted by the rotation fulcrums members 30 and 31,
Further, the outer peripheral surface of the upper drum Du and the outer peripheral surface 70a of the projecting portion 70 provided on the support member SA, which are not shown, are provided on the rotation fulcrum members 30, 3 described by the support member SA.
Even when the support member SA is rotated by the two rotation fulcrums constituted by 1, the support members SA are kept in a state of being included in the extended surfaces of the other surfaces. Even if the rotary shaft 1 is tilted by rotating the rotary magnetic heads Ha and Hb to change the rotation loci of the rotary magnetic heads Ha and Hb, the contact state between the magnetic gaps of the rotary magnetic heads Ha and Hb and the magnetic tape T does not change. , A good reproduced image can always be obtained.

FIG. 12 is a longitudinal sectional view showing the related construction of the lower drum Dd portion and the supporting member SA portion in the drum structure DA of another embodiment of the magnetic recording / reproducing apparatus of the present invention.
The related components of the lower drum Dd portion and the support member SA portion in the drum structure DA described in (1) are the same as those in the drum structure DA of the magnetic recording / reproducing apparatus described with reference to FIG. Between the lower drum Dd and the upper drum Du (not shown), a supporting member SA having a projecting portion 70 having an outer peripheral surface 70a included in an extended surface of the outer peripheral surface of the upper drum Du is used. However, in the configuration example illustrated in FIG. 12, the support member S
The position of the fitting between A and the lower drum Dd and the position of the rotation fulcrum for rotatably supporting the support member SA with respect to the lower drum Dd are shown in FIG. Unlike the case of the example, it is provided near the lower end of the lower drum Dd. FIG. 12A shows a cross-sectional view of a component portion including the lower drum Dd portion and the support member SA portion of the drum structure DA at a position corresponding to the 90-270 degree line position in FIG. Further, FIG. 12B shows the lower drum Dd portion of the drum structure DA and the support member S.
FIG. 3 is a cross-sectional view of a component portion including the portion A at a position corresponding to the 0-180 degree line position in FIG.

The lower drum Dd in the drum structure DA of the embodiment of the magnetic recording / reproducing apparatus of the present invention shown in FIG.
In the vertical cross-sectional view showing the related configuration of the portion of FIG. 3 and the portion of the support member SA, the lower drum Dd having the guide portion G of the reference edge of the magnetic tape on the outer peripheral surface is a fixed portion in the magnetic recording / reproducing apparatus. The plurality of screws 32 (only one screw 32 is shown in FIG. 6) are fixed to the drum base DB functioning as. In the space provided inside the lower drum Dd described above, as in the case of the configuration example described above with reference to FIG. 6, the outer peripheral surface of the upper drum Du is extended from the lower drum Dd. Protrusion 70 having an outer peripheral surface 70a included in the same plane as the plane
Is provided with a support member SA. The supporting member SA is located at two positions on a straight line (a straight line L1 in FIG. 2) passing through the center position of the winding range of the magnetic tape T with respect to the peripheral surface of the drum and the central axis of the lower drum Dd. The above-mentioned support member SA and the lower drum Dd are rotatably connected to each other by members 30, 31 for rotation fulcrums.

In the embodiment illustrated in FIG. 12, a straight line passing through the central position of the winding range of the magnetic tape T with respect to the peripheral surface of the drum and the central axis of the lower drum Dd (see FIG. 2).
Between the bottom portion of the lower drum Dd and the lower surface of the intermediate step portion 72 of the support member SA at a position on the straight line L1) in the inside,
The rotation fulcrums are constituted by the above-described rotation fulcrums members 30 and 31. Further, an edge portion 71 protruding outward is provided at a portion of the intermediate step portion 72 of the support member SA, and a tip end of the edge portion 71 is fitted to an inner wall surface of the lower drum Dd. . That is, in the portion of the intermediate step portion 72 of the support member SA described above, the outer diameter dimension of the edge portion 71 protruding outward and the diameter of the inner wall surface of the lower drum Dd are configured to be the same.

2 which is formed between the lower drum Dd and the support member SA by the above-mentioned members 30, 31 for rotating fulcrums.
The surface including the individual rotation fulcrums and the fitting surface of the inner wall surface of the lower drum Dd and the edge portion 71 protruding outward from the intermediate step portion 72 of the support member SA are extremely close to each other. There is. Further, a surface including two rotation fulcrums formed between the lower drum Dd and the support member SA by the above-described rotation fulcrums members 30 and 31 and rotation of the rotary magnetic heads Ha and Hb (not shown). Although it is largely separated from the locus surface, it is separated from the lower end portion of the upper drum Du (not shown) fixed to the rotating shaft 1 supported by the bearings 5 and 6 provided on the support member SA. The size of the air gap formed between the upper end of the support member SA (or the distance between the upper end of the support member SA and the rotation locus surfaces of the rotary magnetic heads Ha and Hb fixed to the upper drum) is as described above. There is no change even when the support member SA is rotated by the two rotation fulcrums constituted by the above-described rotation fulcrums members 30 and 31,
Further, the outer peripheral surface of the upper drum Du and the outer peripheral surface 70a of the projecting portion 70 provided on the support member SA, which are not shown, are provided on the rotation fulcrum members 30, 3 described by the support member SA.
Even when the support member SA is rotated by the two rotation fulcrums constituted by 1, it is kept in the state of being included in the same surface, so that the support member SA is rotated by the rotation fulcrum described above. Rotating magnetic head H with axis 1 tilted
Even if the rotation loci of a and Hb are changed, the rotating magnetic head H
The contact state between the magnetic gaps a and Hb and the magnetic tape T does not change, and a good reproduced image can always be obtained.

Next, referring to FIG. 9 showing another embodiment of the magnetic recording / reproducing apparatus of the present invention, the lower drum Dd having the guide portion G of the reference edge of the magnetic tape on the outer peripheral surface is magnetic recording / reproducing. A plurality of screws 32 (only one screw 32 is shown in FIG. 9) are fixed to the drum base DB that functions as a fixing portion in the apparatus.
An edge portion 75 that protrudes inward is provided at the inner upper end portion of the lower drum Dd described above, and the tip end of the edge portion 75 described above is in an inner space portion that is configured inside the lower drum Dd. It is fitted to the outer wall surface of the provided support member SA.
That is, the edge portion 75 protruding inward from the upper end portion of the lower drum Dd has an inner diameter dimension of the support member SA.
The outer wall surface has the same diameter as the outer wall surface. Further, the support member SA described above is provided at two positions located on a straight line (a straight line L1 in FIG. 2) passing through the central position of the winding range of the magnetic tape T with respect to the peripheral surface of the drum and the central axis of the lower drum Dd. The lower drum Dd and the lower drum Dd are rotatably connected to each other by members 30, 31 for rotation fulcrums. In the embodiment illustrated in FIG. 9, the center position of the winding range of the magnetic tape T with respect to the peripheral surface of the drum and the lower drum D.
Between the inner upper end of the lower drum Dd at a position on a straight line (a straight line L1 in FIG. 2) passing through the central axis of d and the lower surface of the connecting portion 76 provided on the support member SA. The rotation fulcrums are constituted by the above-described rotation fulcrums members 30 and 31.

The member CA provided between the drum base DB and the supporting member SA is the lower drum Dd and the supporting member S.
The support member SA is provided in a predetermined manner with a straight line (a straight line L1 in FIG. 2) connecting the two rotation fulcrums constituted by the above-described rotation fulcrums members 30 and 31 between A and A as the rotation center. An annular cam member CA used for rotating {of FIG.
(e) Reference}. Figure 5 for the drum base DB
(G), a guide groove 33 into which the annular portion 34 of the annular cam member CA is to be fitted is provided, and the annular cam member CA is provided on the drum base DB. In the guiding groove 33 which is present, the annular part 3 of it
Positioning is carried out by rotatably fitting the four.
In the annular portion 34 of the annular cam member CA described above,
The cam contours 34a and 34b having a predetermined shape are configured,
The circular rack 34 is provided with the arcuate rack 22 via a connecting portion 35. The support member SA and the annular cam member CA described above are the springs 38 to 41.
Is elastically connected to and supported by the drum base DB that functions as a fixing portion of the device.

Bearings 5 and 6 provided on the support member SA
The rotary shaft 1 rotatably supported by the upper drum fixing member 2 is fitted and fixed to the upper drum fixing member 2, and the upper drum Du is fixed to the upper drum fixing member 2 by screws 3 and 4. Md rotates the upper drum Du by the rotating shaft 1. Reference numeral 73 is a hollow cylindrical rotary transformer on the upper drum Du side, and 74 is a hollow cylindrical rotary transformer on the support member SA side. The upper drum Du that is driven and rotated by the rotating shaft 1 is on a straight line (a straight line L1 in FIG. 2) that passes through the center position of the winding range of the magnetic tape T with respect to the peripheral surface of the drum and the central axis of the lower drum Dd. Since the rotary shaft 1 is supported by the support member SA that is rotatably connected by the rotary fulcrum members 30 and 31 at the two positions located at, the rotary shaft 1 is rotatably supported with respect to the lower drum Dd. The hollow-cylindrical rotary transformer 74 attached to the supporting member SA and the hollow-cylindrical rotary transformer 73 attached to the upper drum Du are also interlocked with each other by the above-described rotational movement of the supporting member SA. Since the interval is kept constant, the reproduction output from the rotary magnetic head does not fluctuate even when the inclination angle of the rotary shaft 1 is changed. Even in the case of the magnetic recording / reproducing apparatus illustrated in FIG. 4, the annular rotary transformer 23 attached to the upper drum Du and the annular rotary transformer 24 attached to the support member SA are connected to each other. Since the interval is not changed even when the tilt angle of the rotary shaft 1 is changed, the reproduction output from the rotary magnetic head does not change in signal level.

The cam member CA for adjusting the inclination of the rotary shaft used in each of the structural examples described so far as each embodiment of the magnetic recording / reproducing apparatus of the present invention is, for example, FIG. 5 (e). As illustrated in FIG. 8 and the like, when the power of the motor is transmitted to the arcuate rack 22, the annular portion 34 is rotated in the guide groove 33 formed in the drum base DB. On the other hand, although the cam contour is configured such that the height from the bottom surface of the guide groove 33 provided in the drum base DB is changed, the magnetic recording of the present invention shown in FIG. In the embodiment of the reproducing apparatus, as the cam member CAc for adjusting the inclination of the rotating shaft, for example, as shown in FIG.
A hollow cylindrical body 77 having a flat cross-sectional shape as illustrated in (b), (d) and (f) is used. The inclination adjusting cam member CAc (annular cam member CAc) configured as the hollow cylindrical body 77 is the same as the annular cam member CA described with reference to FIGS. Similarly, when the power of the motor is transmitted to the arcuate rack 22 of the annular cam member, the outer peripheral surface 77a is fitted to the wall surface 33a of the guide groove in the guide groove 33 formed in the drum base DB. The inner peripheral surface 77b of the hollow cylindrical body 77 that rotates in this state constitutes a cam profile in a state of being eccentric with respect to the outer peripheral surface 77a.

FIG. 10 (a) is a sectional view of a portion of the drum structure DA, which is composed of the lower drum Dd and the support member SA, at a position corresponding to the 90-270 degree line position in FIG. 2B shows the structure of the drum structure DA including the lower drum Dd and the supporting member SA.
The sectional view in the position corresponding to the 0-180 degree line position in the inside is shown. In FIG. 10, the lower drum Dd having a guide portion G of the reference edge of the magnetic tape formed on the outer peripheral surface is provided with a plurality of screws 32 (see FIG. Only one screw 32 is shown inside). An edge portion 75 that protrudes inward is provided at the inner upper end portion of the lower drum Dd described above, and the tip end of the edge portion 75 described above is in an inner space portion that is configured inside the lower drum Dd. It is fitted to the outer wall surface of the provided support member SA. That is, the edge portion 75 protruding inward from the upper end portion of the lower drum Dd is configured such that the inner diameter dimension thereof is the same as the diameter of the outer wall surface of the support member SA.

Further, the magnetic tape T on the peripheral surface of the drum
Of the support member SA and the lower drum Dd at two positions located on a straight line (a straight line L1 in FIG. 2) passing through the center position of the winding range of the lower drum Dd and the central axis of the lower drum Dd. The members 30 and 31 are rotatably connected. In the embodiment illustrated in FIG. 10, a straight line passing through the central position of the winding range of the magnetic tape T with respect to the peripheral surface of the drum and the central axis of the lower drum Dd (the straight line L in FIG. 2).
1) Between the inner upper end of the lower drum Dd at the upper position and the lower surface of the connecting portion 76 provided on the support member SA, the rotation fulcrum members 30, 31 described above are used for the rotation fulcrum. Is configured. Hole 8 in the drum base DB
The holes 0, 83, 86, 89 and the holes 82, 85, 88, 91 provided in the drum motor mounting substrate 7 correspond to each other and are shown in FIGS. 10 (a) and 10 (b). Individual springs 81, 84, 87, 91
Is installed. As a result, the support member SA and the upper drum Du are connected to the lower drum D via the two rotary fulcrum members 30 and 31 provided between the lower drum Dd and the support member SA.
It is elastically connected to and supported by d.

An outer peripheral surface 77a is formed on the wall surface 33a of the guide groove 33 (see FIG. 5 (g)) provided in the drum base DB.
The support member SA is projected on the inner peripheral surface 77b of the cam member CAc (annular cam member CAc) for adjusting the inclination of the rotating shaft, which is configured as a hollow cylindrical body 77 which is fitted and rotated. Although the cam followers 78 and 79 are pressed against each other, the cam followers 78 and 79 are formed, for example, as hemispherical shapes. As described above, when the power of the motor is transmitted to the arcuate rack 22 of the cam member CAc for adjusting the inclination of the rotary shaft, the guide groove wall surface 33a in the guide groove 33 formed in the drum base DB is transmitted. The inner peripheral surface 77b of the hollow cylindrical body 77 which rotates with the outer peripheral surface 77a fitted to the outer peripheral surface 77a is displaced while being eccentric to the outer peripheral surface 77a. As a result, the cam followers 78, 7 that are in pressure contact with the cam contour formed by the inner peripheral surface 77b of the hollow cylindrical body 77.
9 is a hollow cylindrical body 77 which functions as the above-mentioned cam contour.
According to the eccentric movement of the inner peripheral surface 77b of the cam follower 78,
The support member SA to which 79 is fixed is displaced.

In the magnetic recording / reproducing apparatus illustrated in FIG. 10, the rotational force of a motor (motor Mg in FIG. 1) (not shown) is passed through a speed reducer, a rotary shaft and a pinion, and a cam member for adjusting the inclination of the rotary shaft. (Circular cam member) When transmitted to the arcuate rack of the CAc, as described above with reference to FIG. 1, the rotational position detecting device 25 of the circular cam member in FIG. 1 is detected.
Generates a position detection signal corresponding to a through hole for position detection provided at a specific position of an arcuate rack (not shown) in the annular cam member CAc, and operates a drive control circuit (not shown). To control. By the operation of the drive control circuit, an annular cam member (annular cam member) C for adjusting the inclination of the rotary shaft that functions as a tilt adjusting means for the rotary shaft.
The support member SA having the cam followers 78 and 79, which are in pressure contact with the cam contour formed by the inner peripheral surface 77b of the annular cam member CAc when the Ac is rotated, is for two rotation fulcrums. It rotates about a straight line (a straight line L1 in FIG. 2) connecting the two rotation fulcrums composed of the members 30 and 31 as a center of rotation, whereby the bearings 5 and 6 provided on the support member SA described above. A straight line passing through the central axis of the lower drum (a straight line L2 in FIG. 2) of the supported rotary shaft 1 which is orthogonal to the straight line connecting the two rotation fulcrums (the straight line L1 in FIG. 2). The position of the rotation locus surface of the rotary magnetic head mounted on the upper drum (not shown) is changed by inclining in a plane including the center axis of the lower drum.

11 (a), (c), and (e) are the same as the longitudinal sectional view shown in FIG. 10 (b), respectively.
FIG. 3 is a cross-sectional view of the drum structure DA taken along the line AA in FIG. 1 (line position 0 ° -180 ° in FIG. 2). Of FIG.
The line 0-0 in the cross-sectional views near the drum structure DA shown in each of (a), (c), and (e) is the drum that functions as a part of the fixing portion of the device as described above. The position of the central axis of the lower drum Dd fixed to the base DB (the straight line 0 in FIG.
The same as the position of −0). FIG. 11A shows an annular cam member (annular cam for adjusting the inclination of the rotary shaft 1 so that the rotary shaft 1 is in a state where it coincides with the central axis of the lower drum Dd (state during normal reproduction). FIG. 12B is a view showing a state in which the member) CA is rotationally adjusted, and FIG.
Is an annular cam member CAc during the normal reproduction.
FIG. 11 is a plan view of a related portion of the annular cam member CAc and the support member SA, which shows a state in which the rotation is adjusted, and FIG. FIG. 4 is a cross-sectional view around the drum structure DA in the case where the rotating shaft 1 is in a tilted state such as a one-dot chain line shown in FIG. Become.

FIG. 11 (d) shows an annular cam member CAc and a support member S showing the state of rotation adjustment when the magnetic recording / reproducing apparatus is performing the rewinding reproducing operation as described above.
11 is a plan view of a portion related to A, and FIG. 11 (e) is a cross-sectional view of the vicinity of the drum structure DA when the magnetic recording / reproducing apparatus is performing the fast-forward reproduction operation. 1 is in a state of being tilted in a tilting direction such as the dotted line shown in FIG. Figure 1
(F) of 1 is a plan view of a portion related to the annular cam member CAc and the support member SA, which shows a state of rotation adjustment when the magnetic recording / reproducing apparatus is performing the fast-forward reproducing operation as described above. .

Next, the magnetic recording / reproducing apparatus of one embodiment of the present invention shown in FIG. 14 will be described. FIG. 1 is a longitudinal sectional view of a part of the magnetic recording / reproducing apparatus of the present invention shown in FIG.
5 (a) is a sectional view of the drum structure DA at the 90-270 degree line position in FIG. 2, and FIG. 15 (b) is a sectional view of the drum structure DA at the 0-180 degree line position in FIG. In FIG. 15, the lower drum Dd having the guide portion G of the reference edge of the magnetic tape on the outer peripheral surface is provided with a plurality of screws 32 (see FIG. 15) with respect to the drum base DB that functions as a fixing portion in the magnetic recording / reproducing apparatus. Although only one screw 32 is shown in FIG. 16, three screws 32 are shown in the exploded perspective view of FIG.
Are shown). The support member SA provided in the inner space portion formed inside the lower drum Dd described above has an edge portion 28 projecting from the outer peripheral surface of the upper end portion thereof, that is, the lower drum Dd. An edge portion 28 configured to have the same diameter as the inner wall surface is fitted to the inner wall surface of the lower drum Dd.

In the magnetic recording / reproducing apparatus shown in FIG. 14, the upper drum Du to which the rotor 92 of the drum drive motor DM is fixed by screws 103 and 104 as shown in FIG. 15 is attached to the upper drum Du. The bearings 93, 94 are fitted on a fixed shaft 99 fixed to the support member SA. A drum motor mounting board 95 to which the stator 105 of the drum drive motor DM is mounted is fixed to the mounting member 106 fitted and fixed to the fixed shaft 99 by screws 96 and 97. A rotary transformer 23 is fixed to the lower end of the upper drum Du. Bearings 93 and 94 fixed to the upper drum Du are fitted to a fixed shaft 99 fixed to the support member SA, and the upper drum D
Since the u and the supporting member SA have the above-mentioned fixed shaft 99 as a common central axis, the stator 1 of the drum drive motor DM
When the rotor 92 is rotated by supplying driving power to the coil No. 05, the rotary transformer 23 on the upper drum Du side that rotates integrally with the rotor 92, and the support member S.
With respect to the rotary transformer 24 on the A side, even if the fixed shaft 99 is inclined, the gap between the two is kept constant.

As described above, the support member SA and the lower drum Dd, which are always held in the concentric state by the fixed shaft 99 fixed to the support member SA, are the magnetic tape T on the peripheral surface of the drum. Rotation fulcrum members 30, 31 at two positions located on a straight line (a straight line L1 in FIG. 2) passing through the center position of the winding range and the central axis of the lower drum Dd.
It is rotatably connected by. In the embodiment illustrated in FIG. 15, a position on a straight line (a straight line L1 in FIG. 2) passing through the central position of the winding range of the magnetic tape T with respect to the peripheral surface of the drum and the central axis of the lower drum Dd. Between the upper end of the above-mentioned support member SA and the projecting edge 29 provided on the lower drum Dd, as shown in FIG. A rotation fulcrum is constituted by.

2 which is formed between the lower drum Dd and the support member SA by the above-described members 30, 31 for pivoting fulcrum.
The surface including the individual rotation fulcrums and the fitting surface between the edge portion 28 projecting from the outer peripheral surface of the upper end portion of the support member SA and the inner wall surface of the lower drum Dd are extremely close to each other, and The surface including the two rotation fulcrums formed between the lower drum Dd and the support member SA by the above-described rotation fulcrums members 30 and 31 is close to the rotation locus surfaces of the rotary magnetic heads Ha and Hb. Therefore, the support member SA is rotated around the straight line connecting the two rotation fulcrums (the straight line L1 in FIG. 2) as a rotation center, and the straight line connecting the two rotation fulcrums (see FIG. 2 is a center of rotation of the upper drum Du in a plane that includes a straight line (straight line L2 in FIG. 2) passing through the central axis of the lower drum among the straight lines orthogonal to the straight line L1) in FIG. Even when the fixed shaft 99 described above is tilted, the rotating magnetic heads Ha and Hb rotate. Marks without largely deviated from the position of the extended surface of the outer circumferential surface of the lower drum Dd, thus tilting the fixed shaft 99 by pivoting the support member SA pivot point that said rotary magnetic head Ha, Hb
Even if the rotation locus of the rotating magnetic head is changed,
The contact state between the magnetic gap portion and the magnetic tape T does not deteriorate, and a good reproduced image can always be obtained.

In FIG. 15, the member CA provided between the drum base DB and the support member SA is the lower drum D.
Between the d and the supporting member SA, the above-mentioned member 3 for rotation fulcrum is provided.
An annular cam member CA used to rotate the support member SA in a predetermined manner with a straight line (a straight line L1 in FIG. 2) connecting two rotation fulcrums constituted by 0 and 31 as a rotation center. Yes, and a specific configuration example thereof is shown in FIG. As shown in FIG. 16 (g), the drum base DB is provided with a guide groove 33 into which the annular portion 34 of the annular cam member CA is fitted,
The annular cam member CA described above is positioned by the annular portion 34 of the annular cam member CA being rotatably fitted in the guide groove 33 provided in the drum base DB. The annular portion 34 of the annular cam member CA described above is provided with cam contours 34a and 34b having a predetermined shape.

The circular rack 34 is provided with an arcuate rack 22 via a connecting portion 35. The support member SA and the annular cam member CA described above are the spring 3
By the biasing force from 8 to 41, the drum base DB functioning as a fixed part of the apparatus is elastically connected and supported. As shown in FIG. 15A, the springs 38 and 39 are inserted into the holes 44 and 45 provided in the drum base DB and the holes 46 and 47 provided in the support member SA. , The above springs 40, 41
Are inserted into the holes 48 and 49 provided in the drum base DB and the holes 101 and 102 provided in the inhibition plate 100.

As shown in FIG. 14, the rotating force of the motor Mg is applied to the arcuate rack 22 of the annular cam member CA described above by the speed reducer 19, the rotating shaft 20, and the pinion 2.
1, and the annular portion 34 of the annular cam member CA is fitted into the guide groove 33 provided in the drum base DB in accordance with the forward and reverse rotation of the motor Mg. The driven member 36 provided on the support member SA engaged with the cam contours 34a, 34b of the predetermined shape formed on the annular portion 34 when the driven member 36,
By 37, the support member SA is a straight line connecting the two rotation fulcrums constituted by the above-mentioned rotation fulcrums members 30 and 31 between the lower drum Dd and the support member SA (a straight line L1 in FIG. 2). The rotation shaft surface of the rotary magnetic heads Ha, Hb is changed by rotating the rotary magnetic heads Ha, Hb by rotating the rotary magnetic heads Ha, Hb.

The motor Mg, which is the power source of the drive mechanism used when changing the amount of rotation of the support member SA, that is, the amount of inclination of the fixed shaft 99, is operated by a drive control circuit not shown in FIG. Performs controlled rotation. The rotational force of the motor Mg described above is transmitted to the tilt adjusting cam member (annular cam member) CA of the rotating shaft via the speed reducer 19, the rotating shaft 20, the pinion 21, and the arcuate rack 22. Reference numeral 25 denotes a rotation position detecting device (for example, photo interrupter) of the annular cam member CA, and the rotation position detecting device 25 of the annular cam member CA is fixed to the drum base DB. The detection device 25 in the annular cam member CA described above corresponds to the through holes 52 to 54 (see FIG. 16) for position detection provided in a specific position of the arcuate rack 22 in the annular cam member CA, To generate a position detection signal used for controlling the operation of the drive control circuit.

Further, in the above-mentioned rotational position detecting device 25 of the annular cam member CA, the through holes 55 to 57 for stoppers provided at specific positions of the arcuate rack 22 of the annular cam member CA (see FIG. 16) is also provided. As the stopper mechanism, for example, a structure having a ball urged by a spring can be used, and a through hole for a stopper provided at a specific position of the arcuate rack 22 in the annular cam member CA described above. By engaging a ball in the stopper mechanism with a selected one of 55 to 57, the rotational position of the annular cam member CA, that is, the fixed shaft 99 described above.
The inclination mode of can be set.

FIG. 17 shows a rotary shaft functioning as the tilt adjusting means of the rotary shaft as described above in the components near the drum structure DA of the embodiment of the magnetic recording / reproducing apparatus of the present invention shown in FIG. When the annular cam member (annular cam member) CA for tilt adjustment is rotated, the cam follower 36 that is in pressure contact with the cam contours 34a and 34b formed in the circumferential direction of the annular cam member CA. , 37 having a support member S
A rotates about a straight line (a straight line L1 in FIG. 2) connecting the two rotation fulcrums constituted by the two rotation fulcrums members 30 and 31 as a rotation center, thereby causing the support member SA to be described above.
A fixed shaft 99 fixed to the above is a straight line that passes through the central axis of the lower drum among the straight lines that intersect the above-described two rotation fulcrums (the straight line L1 in FIG. 2) (the straight line in FIG. 2). L2) and the center axis of the lower drum are tilted in a plane, and the positions of the rotation locus surfaces of the rotary magnetic heads Ha and Hb attached to the upper drum Du are changed and illustrated. Therefore, (a), (d), and (g) of FIG. 17 are similar to the longitudinal sectional view shown in (b) of FIG.
FIG. 3 is a cross-sectional view of the drum structure DA at a line A position (0 ° -180 ° line position in FIG. 2).

The line 0-0 in the sectional view near the drum structure DA shown in each of FIGS. 17 (a), (d) and (g) is the fixed portion of the apparatus as described above. The position of the central axis of the lower drum Dd fixed to the drum base DB functioning as a part (the same as the position of the straight line 0-0 in FIG. 3) is shown. FIG. 17A shows an annular cam member (annular cam) for adjusting the inclination of the rotary shaft so that the fixed shaft 99 is in a state where it coincides with the central axis of the lower drum Dd (state during normal reproduction). FIG. 17B is a diagram showing a state where the member CA is rotationally adjusted, and FIG. 17B is a circular cam showing the state of the rotational adjustment of the annular cam member CA during the normal reproduction. It is a plan view of the member CA, and a straight line L1,
L2 corresponds to the straight lines L1 and L2 shown in FIG. Further, FIG. 17C is a side view of the annular cam member CA corresponding to the plan view of the annular cam member CA at the time of the normal reproduction (FIG. 17B).

FIG. 17D is a sectional view of the vicinity of the drum structure DA when the magnetic recording / reproducing apparatus is performing the fast-forward reproduction operation. In this case, the fixed shaft 99 is shown in FIG. It is in a state of being inclined in the inclination direction as shown by the dotted line. FIG. 17E is a plan view of the annular cam member CA showing the state of rotation adjustment when the magnetic recording / reproducing apparatus is performing the fast-forward reproducing operation as described above, and the straight lines L1 and L2 in the figure are Straight line L shown in FIG.
17 (f) corresponds to 1 and L2, and FIG. 17 (f) is a plan view of the annular cam member CA when the magnetic recording / reproducing apparatus is performing the fast-forward reproducing operation as described above (see FIG. 17).
It is a side view of the annular cam member CA corresponding to (e)}.

Further, FIG. 17 (g) shows the drum structure D when the magnetic recording / reproducing apparatus is performing the rewinding reproducing operation.
FIG. 4 is a cross-sectional view of the vicinity of A, and the fixed shaft 99 in this case is in a state of being tilted in a tilt direction such as the one-dot chain line shown in FIG. FIG. 17 (h) shows an annular cam member CA showing the state of rotation adjustment when the magnetic recording / reproducing apparatus is performing the rewinding reproducing operation as described above.
In the plan view of FIG. 17, straight lines L1 and L2 in the figure correspond to the straight lines L1 and L2 shown in FIG. 2, and (i) in FIG.
FIG. 18 is a side view of the annular cam member CA corresponding to the plan view {(h) of FIG. 17} of the annular cam member CA when the magnetic recording / reproducing apparatus is performing the rewinding reproducing operation as described above.

In the magnetic recording / reproducing apparatus of the present invention shown in FIG. 14, the operator inputs information on the operation mode to the operating section of the magnetic recording / reproducing apparatus, and the reproducing operation mode of the magnetic recording / reproducing apparatus is changed. , Normal playback mode, fast forward playback mode, rewind playback mode,
Corresponding to the change in the reproduction mode, the cam member CA for adjusting the inclination of the rotary shaft is accurately rotated to a predetermined rotation position selected on the drum base DB, and then fixed at that position. It is necessary that the motor Mg, the speed reducer 19, the rotary shaft 20, and the pinion 2 provided on the drum base DB as described above.
1 (see FIG. 1), the power of the motor is transmitted to the arc-shaped rack 22 provided on the cam member CA (see FIG. 16) for adjusting the inclination of the rotary shaft, so that it is transferred to the drum base DB. After rotating the annular cam member CA, which is rotatably fitted in the provided guide groove 33, to the selected predetermined rotational position, the annular cam member CA is rotated at the selected specific rotational position. The fact that the cam member CA is fixed by using the click stop mechanism as described above is the same as in the embodiment of the magnetic recording / reproducing apparatus of the present invention described with reference to FIG. is there.

That is, when the reproduction operation mode set by the operator for the above-mentioned operation section is, for example, the normal reproduction mode, the above-described motor Mg, decelerator 19, and rotation are controlled by the control device (not shown). The power of the motor is transmitted to the arc-shaped rack 22 provided on the cam member CA (see FIG. 16) for adjusting the inclination of the rotary shaft via the shaft 20 and the pinion 21 (see FIG. 14). Base D
When the annular cam member CA, which is rotatably fitted in the guide groove 33 provided in B, is rotated, the cam contours 34a, 3 are formed in the circumferential direction of the annular cam member CA.
The support member SA having the cam followers 36 and 37 in pressure contact with 4b connects the two rotation fulcrums formed by the two rotation fulcrums members 30 and 31 (the straight line L in FIG. 2).
When the fixed shaft 99, which is supported by the bearings 5 and 6 provided on the support member SA, is brought into alignment with the central axis of the lower drum Dd by rotating about 1) as the center of rotation. , A position detecting through hole 52 provided at a specific position of the arcuate rack 22 in the annular cam member CA.
54 to 54 (see FIG. 16), a position detection signal is generated corresponding to the through hole 53 for the normal reproduction mode, the operation of the drive control circuit is controlled by the position detection signal, and the rotation of the motor Mg is stopped. At the same time, the ball urged by the spring in the stopper mechanism provided in the detection device 25 for detecting the rotational position of the annular cam member CA is located at a specific position of the arcuate rack 22 on the annular cam member CA. Through hole 5 for stopper provided in
By engaging with 6, the above-mentioned annular cam member CA is fixed by the above-mentioned click stop mechanism at a specific rotational position determined corresponding to normal reproduction.

Next, when the reproduction operation mode set by the operator for the above-mentioned operation section is, for example, the fast-forward reproduction mode, the above-mentioned motor Mg, speed reducer 19, Rotating shaft 20, pinion 21
(See FIG. 14), through the cam member C for adjusting the inclination of the rotary shaft.
The circular rack 22 provided at A (see FIG. 16) is an annular rack that is rotatably fitted to a guide groove 33 provided at the drum base DB by transmitting the power of the motor. When the cam member CA is rotated, the support member S having the cam followers 36 and 37 that are in pressure contact with the circumferentially formed cam contours 34a and 34b of the annular cam member CA.
The support member SA described above is obtained by rotating A around a straight line (a straight line L1 in FIG. 2) connecting the two rotation fulcrums constituted by the two rotation fulcrums members 30 and 31 as the rotation center.
When the fixed shaft 99 fixedly mounted on the cam shaft is inclined by a specific angle in the inclination direction as shown by the dotted line in FIG. 3B, the rotational position of the annular cam member CA is detected. A device (for example, a photo interrupter) 25 is a through hole for the fast-forward reproduction mode in the through holes 52 to 54 (see FIG. 16) for position detection provided at a specific position of the arcuate rack 22 in the annular cam member CA. 54, a position detection signal is generated, the operation of the drive control circuit is controlled by the position detection signal to stop the rotation of the motor Mg, and the rotation position of the annular cam member CA is detected. The ball urged by the spring in the stopper mechanism provided in the device 25 serves as a stopper provided at a specific position of the arcuate rack 22 in the annular cam member CA described above. Engaged with the holes 57 (see FIG. 16), in particular rotational position determined to correspond to the fast-forward reproduction mode cam member CA of the annular, it is fixed by the click stop mechanism.

Next, when the reproduction operation mode set by the operator for the above-mentioned operation section is, for example, the rewinding reproduction mode, the above-mentioned motor Mg, decelerator 19, Rotating shaft 20, pinion 21
(See FIG. 14), through the cam member C for adjusting the inclination of the rotary shaft.
The circular rack 22 provided at A (see FIG. 16) is an annular rack that is rotatably fitted to a guide groove 33 provided at the drum base DB by transmitting the power of the motor. When the cam member CA is rotated, the support member S having the cam followers 36 and 37 that are in pressure contact with the circumferentially formed cam contours 34a and 34b of the annular cam member CA.
The support member SA described above is obtained by rotating A around a straight line (a straight line L1 in FIG. 2) connecting the two rotation fulcrums constituted by the two rotation fulcrums members 30 and 31 as the rotation center.
When the fixed shaft 99 fixedly mounted on the cam member CA is tilted by a specific angle in the tilt direction as shown by the alternate long and short dash line in FIG. A detection device (for example, a photo interrupter) 25 is used for rewinding reproduction mode in position detecting through holes 52 to 54 (see FIG. 16) provided at specific positions of the arcuate rack 22 in the annular cam member CA. A position detection signal is generated in correspondence with the through hole 52, the operation of the drive control circuit is controlled by the position detection signal to stop the rotation of the motor Mg, and the rotational position of the annular cam member CA described above. The ball urged by the spring in the stopper mechanism provided in the detection device 25 of FIG. 2 is a stopper provided at a specific position of the arcuate rack 22 of the annular cam member CA described above. Through the through hole 55 (see FIG. 16) to fix the above-mentioned annular cam member CA to the specific rotation position determined in correspondence with the rewinding reproduction mode by the click stop mechanism. .

FIG. 18 shows how the support member SA and the lower drum Dd are fitted in the drum structure DA of the embodiment of the magnetic recording / reproducing apparatus of the present invention described with reference to FIG. 15 and the lower drum Dd. Of the lower drum Dd and the support member SA in the drum structure DA of another embodiment of the magnetic recording / reproducing apparatus of the present invention, which has a different support mode for rotatably supporting the support member SA. FIG. 19A is a vertical cross-sectional view showing a configuration related to a portion, and FIG. 18A shows a configuration portion including a portion of the lower drum Dd and a portion of the support member SA in the drum structure DA, which is indicated by 90 in FIG. Degree-270
FIG. 18 shows a cross-sectional view at a position corresponding to the parallel line position, and FIG. 18 (b) shows a portion of the drum structure DA including a lower drum Dd portion and a supporting member SA portion in FIG. The cross-sectional view at the position corresponding to the 0-180 degree line position of FIG.

FIG. 18 is a vertical cross-sectional view showing the related construction of the lower drum Dd portion and the supporting member SA portion of the drum structure DA of another embodiment of the magnetic recording / reproducing apparatus of the present invention. The lower drum Dd having a guide portion G of the reference edge of the magnetic tape formed on the outer peripheral surface thereof is a drum base DB that functions as a fixed portion in the magnetic recording / reproducing apparatus.
A plurality of screws 32 (in FIG. 18, one screw 3
(Only 2 shown). The upper end of the lower drum Dd is provided with an inwardly projecting edge 58, and the tip of the edge 58 is the lower drum Dd.
It is fitted to the outer wall surface of the support member SA provided in the inner space portion formed inward of d. That is, the edge portion 58 projecting inwardly from the upper end portion of the lower drum Dd is configured such that the inner diameter dimension thereof is the same as the diameter of the outer wall surface of the support member SA.

Further, the magnetic tape T on the peripheral surface of the drum
Of the support member SA and the lower drum Dd at two positions located on a straight line (a straight line L1 in FIG. 2) passing through the center position of the winding range of the lower drum Dd and the central axis of the lower drum Dd. The members 30 and 31 are rotatably connected. In the embodiment illustrated in FIG. 18, a straight line passing through the center position of the winding range of the magnetic tape T with respect to the peripheral surface of the drum and the central axis of the lower drum Dd (the straight line L in FIG. 2).
1) the upper end of the lower drum Dd described above in the upper position,
Between the lower surface of the protrusion 70 provided on the support member SA,
The rotation fulcrums are constituted by the above-described rotation fulcrums members 30 and 31. And the above-mentioned member 3 for rotation fulcrum
A surface including two rotation fulcrums formed between the lower drum Dd and the support member SA by 0 and 31, and an edge portion 58 protruding inward from the upper end portion of the lower drum Dd described above. It is extremely close to the fitting surface of the support member SA with the outer wall surface.

Further, the above-mentioned members 30, 31 for rotation fulcrum.
A surface including two rotation fulcrums formed between the lower drum Dd and the supporting member SA by the rotating magnetic heads Ha, H.
The rotation locus surface of b (not shown) is separated by the length in the generatrix direction of the outer peripheral surface 70a of the protrusion 70 provided on the support member SA, but is fixed to the support member SA described above. The upper drum Du in which the bearings 93 and 94 fixedly mounted on the upper drum Du are fitted to the fixed shaft 99 existing therein.
The gap size formed between the lower end of the support member SA (not shown) and the upper end of the support member SA (or the upper ends of the support member SA and the rotary magnetic heads Ha, Hb fixed to the upper drum).
(Distance from the rotation locus surface of 2) of the support member SA formed by the rotation fulcrum members 30 and 31 described above.
It does not change even when it is rotated by the individual rotation fulcrums, and the outer peripheral surface 70a of the protrusion 70 provided on the support member SA and the outer peripheral surface of the upper drum Du (not shown).
Means that even when the support member SA is rotated by the two rotation fulcrums constituted by the rotation fulcrums members 30 and 31, the supporting member SA is included in the extended surfaces of the other surfaces. Since the support member SA is rotated by the above-described rotation fulcrum, the fixed shaft 9 is maintained.
Even if the rotation loci of the rotary magnetic heads Ha and Hb are changed by inclining 9, the contact state between the magnetic gap portion of the rotary magnetic heads Ha and Hb and the magnetic tape T does not change, and a good reproduced image is always obtained. To be

FIG. 19 is a vertical cross-sectional view showing the related structure of the lower drum Dd portion and the supporting member SA portion in the drum structure DA of another embodiment of the magnetic recording / reproducing apparatus of the present invention.
18 is a perspective view showing a structure related to the lower drum Dd portion and the supporting member SA portion in the drum structure DA described in FIG.
Drum structure DA of the magnetic recording / reproducing apparatus described above with reference to FIG.
In the same manner as in the above case, between the lower drum Dd and the upper drum Du (not shown), a projecting portion 70 having an outer peripheral surface 70a that is included in an extension surface of the outer peripheral surface of the upper drum Du is provided. The supporting member SA is used, but in the configuration example illustrated in FIG. 19, the supporting member S is used.
The position of the fitting between A and the lower drum Dd and the position of the rotation fulcrum for rotatably supporting the support member SA with respect to the lower drum Dd are shown in FIG. Unlike the case of the example, it is provided near the lower end of the lower drum Dd.

FIG. 19 (a) is a sectional view of a portion of the drum structure DA, which is composed of the lower drum Dd portion and the support member SA portion, at a position corresponding to the 90-270 degree line position in FIG. FIG. 19B is a diagram showing the structure of the drum structure DA, which includes the lower drum Dd and the supporting member SA.
The sectional view in the position corresponding to the 0-180 degree line position in the inside is shown. The lower drum Dd in the drum structure DA of the embodiment of the magnetic recording / reproducing apparatus of the present invention shown in FIG.
In the vertical cross-sectional view showing the related configuration of the portion of FIG. 3 and the portion of the support member SA, the lower drum Dd having the guide portion G of the reference edge of the magnetic tape on the outer peripheral surface is a fixed portion in the magnetic recording / reproducing apparatus. The plurality of screws 32 (only one screw 32 is shown in FIG. 18) are fixed to the drum base DB functioning as.

In the space provided inside the lower drum Dd, the outer periphery of the upper drum Du projects from the lower drum Dd as in the case of the configuration example described above with reference to FIG. A support member SA is provided that includes a protrusion 70 having an outer peripheral surface 70a included in the same surface as the extended surface of the surface. The supporting member SA is located at two positions on a straight line (a straight line L1 in FIG. 2) passing through the center position of the winding range of the magnetic tape T with respect to the peripheral surface of the drum and the central axis of the lower drum Dd. The support member SA described above,
The lower drum Dd is rotatably connected to the lower fulcrum members 30 and 31. In the embodiment illustrated in FIG. 19, a position on a straight line (a straight line L1 in FIG. 2) passing through the central position of the winding range of the magnetic tape T with respect to the peripheral surface of the drum and the central axis of the lower drum Dd. A rotation fulcrum is formed between the bottom portion of the lower drum Dd and the lower surface of the intermediate step portion 72 of the support member SA by the above-described rotation fulcrums members 30 and 31. In addition, the above-mentioned support member S
An edge portion 71 protruding outward is provided at a portion of the intermediate step portion 72 in A, and a tip end of the edge portion 71 is fitted to an inner wall surface of the lower drum Dd. That is, in the portion of the intermediate step portion 72 of the support member SA described above, the outer diameter dimension of the edge portion 71 protruding outward and the diameter of the inner wall surface of the lower drum Dd are configured to be the same.

The rotary fulcrum members 30 and 31 are provided between the lower drum Dd and the supporting member SA.
The surface including the individual rotation fulcrums and the fitting surface of the inner wall surface of the lower drum Dd and the edge portion 71 protruding outward from the intermediate step portion 72 of the support member SA are extremely close to each other. There is. Further, a surface including two rotation fulcrums formed between the lower drum Dd and the support member SA by the above-described rotation fulcrums members 30 and 31 and rotation of the rotary magnetic heads Ha and Hb (not shown). The upper drum Du is separated from the fixed surface 99 (not shown in FIG. 19), which is largely separated from the locus surface, but is fitted and fixed in the shaft hole 108 provided in the support member SA. A lower end portion of an upper drum Du (not shown) fitted with bearings 93 and 94 fixed to the upper drum Du,
Void size formed between the upper end of the support member SA (or the distance between the upper end of the support member SA and the rotation locus surface of the rotary magnetic heads Ha and Hb fixed to the upper drum).
Is a member 3 for the rotation fulcrum described above by the support member SA.
It does not change even when it is rotated by the two rotation fulcrums constituted by 0 and 31, and the outer peripheral surface (not shown) of the upper drum Du and the protruding portion 70 provided on the support member SA. The outer peripheral surface 70a is kept in a state of being included in the same surface even when the support member SA is rotated by the two rotation fulcrums constituted by the rotation fulcrums members 30 and 31. Therefore, even if the fixed shaft 99 is tilted by changing the rotation locus of the rotary magnetic heads Ha and Hb by rotating the support member SA by the above-described rotation fulcrum, the magnetic force of the rotary magnetic heads Ha and Hb is reduced. The contact state between the void and the magnetic tape T does not change, and a good reproduced image can always be obtained.

Next, in FIG. 20 showing another embodiment of the magnetic recording / reproducing apparatus of the present invention, the lower drum Dd having the guide portion G of the reference edge of the magnetic tape formed on the outer peripheral surface is the magnetic recording / reproducing apparatus. The plurality of screws 32 (only one screw 32 is shown in FIG. 20) are fixed to the drum base DB functioning as the fixing portion in FIG. An edge portion 75 that protrudes inward is provided at the inner upper end portion of the lower drum Dd described above, and the tip end of the edge portion 75 described above is in an inner space portion that is configured inside the lower drum Dd. It is fitted to the outer wall surface of the provided support member SA. That is, the edge portion 75 protruding inward from the upper end portion of the lower drum Dd is configured such that the inner diameter dimension thereof is the same as the diameter of the outer wall surface of the support member SA.

Further, the magnetic tape T on the peripheral surface of the drum
Of the support member SA and the lower drum Dd at two positions located on a straight line (a straight line L1 in FIG. 2) passing through the center position of the winding range of the lower drum Dd and the central axis of the lower drum Dd. The members 30 and 31 are rotatably connected. In the embodiment illustrated in FIG. 20, a straight line passing through the center position of the winding range of the magnetic tape T with respect to the peripheral surface of the drum and the central axis of the lower drum Dd (the straight line L in FIG. 2).
1) Between the inner upper end of the lower drum Dd at the upper position and the lower surface of the connecting portion 76 provided on the support member SA, the rotation fulcrum members 30, 31 described above are used for the rotation fulcrum. Is configured.

The member CA provided between the drum base DB and the supporting member SA is the lower drum Dd and the supporting member S.
The support member SA is provided in a predetermined manner with a straight line (a straight line L1 in FIG. 2) connecting the two rotation fulcrums constituted by the above-described rotation fulcrums members 30 and 31 between A and A as the rotation center. An annular cam member CA used for rotating {of FIG.
(e) Reference}. Figure 1 for the drum base DB
As shown in FIG. 6 (g), the annular cam member CA
Is provided with a guide groove 33 into which the annular portion 34 is fitted, and the annular cam member CA has the annular portion 34 rotatably in the guide groove 33 provided in the drum base DB. Positioned by fitting. The ring-shaped portion 34 of the ring-shaped cam member CA is provided with cam contours 34a and 34b having a predetermined shape, and the ring-shaped portion 34 is provided with the arcuate rack 22 via a connecting portion 35. ing. The support member SA and the annular cam member CA described above are the springs 38-4.
1 is provided between the drum base DB functioning as a fixing part of the apparatus and the restraining plate 100, the drum base D
B is elastically connected and supported.

In the upper drum Du in which the bearings 93, 94 fixedly mounted in the upper drum Du are fitted to the fixed shaft 99 fitted and fixed in the shaft hole 108 provided in the above-mentioned supporting member SA. Is the rotor 9 of the drum drive motor DM
2 is fixed and the rotor 9 of the drum drive motor DM
During the rotation of 2, the upper drum Du rotates about the fixed shaft 99 described above. Reference numeral 73 is a hollow cylindrical rotary transformer on the upper drum Du side, and 74 is a hollow cylindrical rotary transformer on the support member SA side. The above-mentioned upper drum Du is located at two positions on a straight line (a straight line L1 in FIG. 2) passing through the center position of the winding range of the magnetic tape T with respect to the peripheral surface of the drum and the central axis of the lower drum Dd. Since it is driven and rotated about the fixed shaft 99 fixed to the support member SA rotatably connected by the rotation fulcrums 30 and 31, it is rotatable with respect to the lower drum Dd. The hollow-cylindrical rotary transformer 74 attached to the support member SA and the hollow-cylindrical rotary transformer 73 attached to the upper drum Du are mounted on the support member SA. Since the mutual distance is kept constant, the signal level of the reproduced output from the rotary magnetic head does not fluctuate even when the tilt angle of the fixed shaft 99 is changed. Even in the case of the magnetic recording / reproducing apparatus illustrated in FIG. 15, the annular rotary transformer 23 attached to the upper drum Du and the annular rotary transformer 24 attached to the support member SA are connected to each other. Since the interval does not change even when the inclination angle of the fixed shaft 99 is changed, the reproduction output from the rotary magnetic head does not change in signal level.

The fixed shaft inclination adjusting cam member CA used in each of the structural examples described so far as each embodiment of the magnetic recording / reproducing apparatus of the present invention is, for example, FIG. 16 (e). As shown in FIG. 8 and the like, when the power of the motor is transmitted to the arcuate rack 22, the annular portion 34 is rotated in the guide groove 33 formed in the drum base DB. On the other hand, the cam contour is configured such that the height from the bottom surface of the guide groove 33 provided in the drum base DB is changed, but the magnetic recording of the present invention shown in FIG. In the embodiment of the reproducing apparatus, as the fixed shaft inclination adjusting cam member CAc, for example, as shown in FIG.
A hollow cylindrical body 77 having a flat cross-sectional shape as illustrated in (b), (d) and (f) is used. The fixed shaft inclination adjusting cam member CAc (annular cam member CAc) configured as the hollow cylindrical body 77 is shown in FIG.
Similar to the case of the annular cam member CA described above with reference to FIG. 16 and the like, when the power of the motor is transmitted to the arcuate rack 22 of the annular cam member, the drum base D
In the guide groove 33 configured in B, the wall surface 33a of the guide groove
The hollow cylindrical body 7 that rotates with the outer peripheral surface 77a fitted to the
The inner peripheral surface 77b of No. 7 constitutes a cam contour in a state of being eccentric with respect to the outer peripheral surface 77a.

FIG. 22 (a) is a sectional view of a portion of the drum structure DA, which is composed of the lower drum Dd portion and the support member SA portion, at a position corresponding to the 90-270 degree line position in FIG. FIG. 22 (b) shows a structural portion including a portion of the lower drum Dd and a portion of the supporting member SA in the drum structure DA, and FIG.
The sectional view in the position corresponding to the 0-180 degree line position in the inside is shown. In FIG. 22, the lower drum Dd having a guide portion G of the reference edge of the magnetic tape on the outer peripheral surface is provided with a plurality of screws 32 (see FIG. 22) with respect to the drum base DB that functions as a fixing portion in the magnetic recording / reproducing apparatus. Only one screw 32 is shown inside). An edge portion 75 that protrudes inward is provided at the inner upper end portion of the lower drum Dd described above, and the tip end of the edge portion 75 described above is in an inner space portion that is configured inside the lower drum Dd. It is fitted to the outer wall surface of the provided support member SA. That is, the edge portion 75 protruding inward from the upper end portion of the lower drum Dd is configured such that the inner diameter dimension thereof is the same as the diameter of the outer wall surface of the support member SA.

Further, the magnetic tape T for the peripheral surface of the drum is used.
Of the support member SA and the lower drum Dd at two positions located on a straight line (a straight line L1 in FIG. 2) passing through the center position of the winding range of the lower drum Dd and the central axis of the lower drum Dd. The members 30 and 31 are rotatably connected. In the embodiment illustrated in FIG. 22, a straight line passing through the central position of the winding range of the magnetic tape T with respect to the peripheral surface of the drum and the central axis of the lower drum Dd (the straight line L in FIG. 2).
1) Between the inner upper end of the lower drum Dd at the upper position and the lower surface of the connecting portion 76 provided on the support member SA, the rotation fulcrum members 30, 31 described above are used for the rotation fulcrum. Is configured. Hole 8 in the drum base DB
0,83,86,89 and holes 82,8 provided in the restraining plate 100 attached to the supporting member SA by the screws 106,107.
The corresponding holes at 5,88,91 are shown in FIG.
As shown in 2 (a) and (b), individual springs 81, 84, 87 and 90 are mounted. As a result, the support member SA and the upper drum Du are elastically connected to and supported by the lower drum Dd via the two rotary fulcrum members 30 and 31 provided between the lower drum Dd and the support member SA. Has been done.

An outer peripheral surface 77 is formed on the wall surface 33a of the guide groove 33 (see (g) of FIG. 16) provided in the drum base DB.
On the inner peripheral surface 77b of the rotary shaft inclination adjusting cam member CAc (annular cam member CAc) configured as a hollow cylindrical body 77 which is fitted and rotated by a, the supporting member SA is projected. Although the cam followers 78 and 79 are pressed against each other, the cam followers 78 and 79 are formed, for example, as hemispherical shapes. As described above, when the power of the motor is transmitted to the arcuate rack 22 of the cam member CAc for adjusting the inclination of the rotary shaft, the guide groove wall surface 33a in the guide groove 33 formed in the drum base DB is transmitted. The inner peripheral surface 77b of the hollow cylindrical body 77 which rotates with the outer peripheral surface 77a fitted to the outer peripheral surface 77a is displaced while being eccentric to the outer peripheral surface 77a.
As a result, the cam follower 78 that is in pressure contact with the cam contour formed by the inner peripheral surface 77b of the hollow cylindrical body 77,
79 is a hollow cylindrical body 7 which functions as the above-mentioned cam contour.
In accordance with the eccentric movement of the inner peripheral surface 77b of the cam follower 7
The support member SA to which 8, 79 are fixed is displaced.

In the magnetic recording / reproducing apparatus illustrated in FIG. 22, the rotational force of a motor (motor Mg in FIGS. 1 and 14) (not shown) passes through the speed reducer, the rotary shaft, and the pinion.
Cam member (annular cam member) CAc for adjusting the inclination of the rotary shaft
1 or 14 when transmitted to the arc-shaped rack of FIG.
As described above with reference to FIG.
A position detection signal is generated corresponding to a through hole for position detection provided in a specific position of an arc-shaped rack (not shown) in Ac to control the operation of a drive control circuit (not shown). By the operation of the drive control circuit, when the annular cam member (annular cam member) CAc for adjusting the inclination of the rotating shaft that functions as the inclination adjusting means of the rotating shaft is rotated, the annular cam member CAc is rotated. Cam followers 78 and 7 that are in pressure contact with the cam contour formed by the inner peripheral surface 77b
The support member SA having 9 has two rotary fulcrum members 3
The fixed shaft 99 fixed to the support member SA is rotated about a straight line (a straight line L1 in FIG. 2) connecting two rotary fulcrums composed of 0 and 31 as a rotation center.
Is a straight line that passes through the central axis of the lower drum (a straight line L2 in FIG. 2) that is orthogonal to the straight line that connects the two pivots (the straight line L1 in FIG. 2), and The position of the rotation locus surface of the rotary magnetic head attached to the upper drum (not shown) is changed by inclining in a plane including

21 (a), (c), and (e) are similar to the longitudinal sectional view shown in FIG. 22 (b), and are taken along line A--A in FIG. 14 (see FIG. 2). FIG. 22 is a cross-sectional view of the drum structure DA taken along the line (0 ° -180 ° line position in the drawing), showing a cross-section near the drum structure DA shown in each of FIGS. 21 (a), 21 (c), and 21 (e). The 0-0 line in the figure is the position of the central axis of the lower drum Dd fixed to the drum base DB that functions as a part of the fixing portion of the apparatus as described above (the straight line 0-0 in FIG. 3). The same as the position). FIG. 21A shows an annular cam member (annular cam for adjusting the inclination of the fixed shaft so that the fixed shaft 99 is aligned with the central axis of the lower drum Dd (state during normal reproduction). Material) CA
FIG. 21B is a view showing a state in which the rotation is adjusted, and FIG. 21B shows the state in which the rotation of the annular cam member CAc is adjusted during the normal reproduction. And FIG. 21C is a plan view of a portion related to the support member SA, and FIG. 21C is a cross-sectional view of the vicinity of the drum structure DA when the magnetic recording / reproducing apparatus is performing the rewinding reproducing operation, The fixed shaft 99 in this case is shown in FIG.
(B), the state is such that it is inclined in the inclination direction as indicated by the alternate long and short dash line.

FIG. 21D shows an annular cam member CAc and a supporting member S which show the state of rotation adjustment when the magnetic recording / reproducing apparatus is performing the rewinding reproducing operation as described above.
FIG. 22 is a plan view of a portion related to A, and FIG. 21 (e) is a sectional view near the drum structure DA when the magnetic recording / reproducing apparatus is performing the fast-forward reproduction operation. 1 is in a state of being tilted in a tilting direction like a dotted line shown in FIG. Figure 2
(F) of 1 is a plan view of a portion related to the annular cam member CAc and the support member SA, which shows a state of rotation adjustment when the magnetic recording / reproducing apparatus is performing the fast-forward reproducing operation as described above. .

As a constituent member for adjusting the inclination of the rotary shaft 1 (or the fixed shaft 99) used in the respective structural examples described so far as the respective embodiments of the magnetic recording / reproducing apparatus of the present invention. Is, for example, FIG. 5 {or (e) of FIG. 16 or FIG.
Etc., when the power of the motor is transmitted to the arc-shaped rack 22, the annular portion 34 rotated in the guide groove 33 formed in the drum base DB, A cam member CA for adjusting the inclination of the rotating shaft 1 (or the fixed shaft 99), which has a cam profile having a configuration in which the height from the bottom surface of the guide groove 33 provided in the drum base DB changes. Like the constituent member for adjusting the inclination of the rotary shaft 1 (or the fixed shaft 99) used in the respective configuration examples shown in FIGS. 10 and 22, the rotary shaft 1 (or the fixed shaft 9)
As the inclination adjusting cam member CAc of 9), for example, as shown in FIG.
(b), (d), (f) {or (b) of FIG. 21,
A hollow cylindrical body 77 having a cam profile in which the wall thickness of the cylinder changes in a predetermined direction in the circumferential direction as shown in the plan sectional shape in (d) and (f)} is used. However, in the magnetic recording / reproducing apparatus of the present invention, the rotating shaft 1
(Or the fixed shaft 99) as a component for adjusting the inclination of the rotary shaft 1 (or the fixed shaft 99) that should be used to bring the rotary shaft 1 (or the fixed shaft 99) into a predetermined tilt mode according to the operation mode. It is not limited to the tilt adjusting cam members CA and CAc (or the fixed shaft 99).

That is, in the magnetic recording / reproducing apparatus of the present invention, in order to make the rotating shaft 1 (or the fixed shaft 99) in a predetermined inclination mode according to the operation mode, the rotating shaft 1 (or the fixed shaft 99), or The components such as the support member SA and the upper drum, which are configured to be able to be tilted integrally with the rotary shaft 1 (or the fixed shaft 99), have a predetermined tilt mode according to the operation mode of the magnetic recording / reproducing apparatus. It is possible to adopt any desired configuration mode that can be tilted at any angle. For example, a supporting member SA itself configured to be able to tilt integrally with the rotating shaft 1 (or the fixed shaft 99) or a non-rotating component part that can rotate integrally with the supporting member SA is illustrated in FIG. 2 is provided with drive displacement means for displacing in the direction of the second straight line L2, and the displacement amount is changed according to the operation mode of the magnetic recording / reproducing apparatus, and the rotary shaft 1 (or fixed shaft) is fixed. The shaft 99) can be configured to have a predetermined inclination mode. For example, as the drive displacement means, a plunger, a stepping motor or the like is used as a power source, and the power from the power source is For example, a supporting member S is formed as a linear displacement by a steel wire.
A is transmitted to A itself or a non-rotational component that can rotate integrally with the support member SA, and its position is regulated by a spring and one stopper so that it is always held in a predetermined inclined state, for example. Supporting member SA described above
By displacing itself or a non-rotational component capable of rotating integrally with the support member SA to the position of the other stopper, the rotary shaft 1 (or the fixed shaft 99) is set to a predetermined inclination mode. It can be implemented as a structure that is displaced so that

In FIG. 23, the inclination of the rotary shaft 1 rotatably supported by the bearings 5 and 6 provided on the support member SA and fixed to the upper drum Du is determined by the operation of the magnetic recording / reproducing apparatus. It is a configuration example of a magnetic recording and reproducing apparatus of the present invention configured to directly change according to the mode,
Further, FIG. 24 shows the bearing 9 provided on the upper drum Du.
According to the present invention, the inclination of the fixed shaft 99 fixed to the supporting member SA and fixed to the supporting members SA is directly changed according to the operation mode of the magnetic recording / reproducing apparatus. FIG. 25 is a configuration example of the recording / reproducing apparatus, and FIG. 25 is a drive displacement mechanism used to change the tilted state of the rotary shaft 1 or the fixed shaft 99 in the magnetic recording / reproducing apparatus illustrated in FIGS. 23 and 24. It is a perspective view showing the example of composition of composition.

First, a configuration example of the magnetic recording / reproducing apparatus of the present invention illustrated in FIG. 23 will be described. FIG. 23
2A is similar to the case of FIG.
FIG. 6 is a cross-sectional view of the drum structure DA at a 90-270 degree line position in the inside, and a guide portion G of the reference edge of the magnetic tape is provided on the outer peripheral surface.
The lower drum Dd configured as described above is fixed by a plurality of screws 32 (only one screw 32 is shown in FIG. 23) to the drum base DB that functions as a fixing portion in the magnetic recording / reproducing apparatus. Has been done. The support member SA provided in the inner space portion formed inside the lower drum Dd described above has an edge portion 28 projecting from the outer peripheral surface of the upper end thereof, that is, the lower drum Dd. Edge 2 configured to have the same diameter as the inner wall surface
8 is fitted to the inner wall surface of the lower drum Dd.

Further, the magnetic tape T on the peripheral surface of the drum
Of the supporting member SA and the lower drum Dd at two positions located on a straight line (a straight line L1 in FIG. 2) passing through the center position of the winding range of the lower drum Dd and the central axis of the lower drum Dd. A straight line that is rotatably connected by the members 30 and 31 and that passes through the center position of the winding range of the magnetic tape T with respect to the peripheral surface of the drum and the central axis of the lower drum Dd (see FIG. 2).
A rotation fulcrum is formed by the rotation fulcrums members 30 and 31 between the upper end of the support member SA at a position on the straight line L1) and the protruding edge 29 provided on the lower drum Dd. Has been done. Rotational fulcrum members 30, 3 described above
1, a surface including the two rotation fulcrums 30, 31 formed between the lower drum Dd and the support member SA, and an edge portion 28 projecting from the outer peripheral surface of the upper end portion of the support member SA described above.
And the fitting surface between the inner surface of the lower drum Dd and the inner wall surface of the lower drum Dd are extremely close to each other, and the two rotations formed between the lower drum Dd and the support member SA by the above-described rotation fulcrum members 30, 31. Since the plane including the dynamic fulcrum is close to the rotational trajectory planes of the rotary magnetic heads Ha and Hb, the support member SA is rotated by a straight line (a straight line L1 in FIG. 2) connecting the two rotary fulcrums. A straight line (straight line L2 in FIG. 2) which is rotated about the center of movement of the lower drum among straight lines that are orthogonal to the straight line (the straight line L1 in FIG. 2) connecting the two pivots described above. Even when the rotary shaft 1 is tilted in a plane including the central axis of the lower drum, the rotation loci of the rotary magnetic heads Ha and Hb do not largely deviate from the position of the extended surface of the outer peripheral surface of the lower drum Dd. Therefore, the support member SA should be rotated by the above-described rotation fulcrum. Even if the rotary shaft 1 is tilted to change the rotation loci of the rotary magnetic heads Ha and Hb, the contact state between the magnetic gap portion of the rotary magnetic heads Ha and Hb and the magnetic tape T is not deteriorated and is always good. A reproduced image can be obtained. Note that, of the drawing reference numerals used in FIG. 23, the constituent parts indicated by the same drawing reference numerals as those used in FIG. 4 correspond to the constituent parts shown in FIG. It is the constituent part.

FIG. 23B is a sectional view taken along line 0 ° -180 ° in FIG. 2, and FIGS. 23A and 23B are sectional views.
In, the rotary shaft 1 of the drum drive motor Md that drives and rotates the upper drum Du is rotatably supported by bearings 5 and 6 provided on the support member SA. The configuration of the drum drive motor Md is the same as that described above with reference to FIG. 4, and therefore detailed description thereof will be omitted here. The rotary shaft 1 rotatably supported by the bearings 5 and 6 provided on the support member SA has one end fitted and fixed to the upper drum fixing member 2, and the upper drum fixing member 2 The upper drum Du is fixed by screws 3 and 4, and the drum drive motor Md rotates the upper drum Du by the rotating shaft 1. The drum drive motor M described above
A bearing 114 is fitted to the other end of the rotating shaft 1 of d, and the casing 118 of the bearing 114 has a rectangular (or square) plane cross section orthogonal to the rotating shaft 1. Has been done. The casing 118 of the bearing 114 is inserted into the rectangular hole 117 formed in the substrate 109, and the casing 1 of the bearing 114 is rotated even if the rotary shaft 1 rotates.
Eighteen rotations are blocked. The substrate 109 is fixed to the drum base DB with screws 110.

Further, when the rotary shaft 1 is inclined in a plane including the straight line L2 in FIG. 2 and the center axis of the lower drum Dd, the two surfaces 118a, 118 of the bearing 114 on the side of the housing 118 are formed.
The c moves in the rectangular hole 117 while slidingly contacting the side surface of the rectangular hole 117 formed in the substrate 109.
One side surface 118d of the casing 118 of the bearing 114 inserted into the rectangular hole 117 formed in the substrate 109 is provided at one side in the longitudinal direction of the rectangular hole 117. The spring 115 is stretched between the stud 116 and the stud 116, and the other side surface 118b of the casing 118 of the bearing 114 is provided on the other side in the longitudinal direction of the rectangular hole 117. It is connected by a steel wire 113 to the operating rod 112 of the plunger 111 (see also FIG. 25). 119,1
Reference numeral 22 denotes a stopper mounting member that is mounted on the substrate 109 by screws 120 and 123, and adjusting screws 121 and 124 for stoppers are screwed into the stopper mounting members 119 and 122, respectively. The stopper mounting members 119 and 122 have through holes 125 through which the steel wire 113 passes.
Alternatively, the through hole 12 for passing the spring 115
6 is provided.

In the magnetic recording / reproducing apparatus having the structure shown in FIG. 23, the operating rod 112 is located at any one of the two positions of the operating rod 112 which is determined in correspondence with the energized state of the plunger 111. Depending on whether or not the one side surface 118b of the casing 118 of the bearing 114 is positioned by the tip of the adjusting screw 121 for the stopper, and the casing 118 of the bearing 114 described above.
The side surface 118d of the rotary shaft 1 is positioned by the tip of the adjusting screw 124 for the stopper, so that the rotary shaft 1 rotatably supported by the bearing 114 is tilted. Is set.

Next, a structural example of the magnetic recording / reproducing apparatus of the present invention illustrated in FIG. 24 will be described. 24A is a cross-sectional view of the drum structure at the 90-270 degree line position in FIG. 2, similarly to the embodiment described above with reference to FIG. Rotor 92 of drum drive motor DM
The upper drum Du, to which the screws are fixed by screws 103 and 104, has a fixed shaft 9 in which bearing portions 93 and 94 attached to the upper drum Du are fixed to the support member SA.
It is fitted to the 9. The drum drive motor DM is attached to the mounting member 106 fitted and fixed to the fixed shaft 99.
The drum motor mounting board 95 to which the stator 105 of FIG. 1 is mounted is fixed by screws 96 and 97.
A rotary transformer 23 is fixed to the lower end of the upper drum Du. The upper drum Du has bearings 93 and 94 fixedly mounted on the fixed shaft 99 fixed to the support member SA, and the upper drum Du and the support member SA have the fixed shaft 99 described above. Since the center axis is common, when the drive power is supplied to the coil of the stator 105 of the drum drive motor DM to rotate the rotor 92, the rotation on the upper drum Du side that rotates integrally with the rotor 92 is performed. Even if the fixed shaft 99 is inclined, the gap between the transformer 23 and the rotary transformer 24 on the support member SA side is kept constant.

As described above, the support member SA and the lower drum Dd which are always held in the concentric state by the fixed shaft 99 fixed to the support member SA are the magnetic tape T on the peripheral surface of the drum. Rotation fulcrum members 30, 31 at two positions located on a straight line (a straight line L1 in FIG. 2) passing through the center position of the winding range and the central axis of the lower drum Dd.
It is rotatably connected by. The center position of the winding range of the magnetic tape T on the peripheral surface of the drum and the lower drum Dd
The upper end of the support member SA at a position on a straight line (a straight line L1 in FIG. 2) passing through the central axis of the lower drum D
A rotation fulcrum is formed by the above-described rotation fulcrums members 30 and 31 between the protruding edge 29 provided at d. A surface including the two rotation fulcrums 30, 31 formed between the lower drum Dd and the support member SA by the above-described rotation fulcrums members 30, 31 and the outer periphery of the upper end portion of the support member SA described above. The edge 28 projecting from the surface and the fitting surface of the inner wall surface of the lower drum Dd are extremely close to each other, and the lower drum Dd and the support member SA are provided by the above-described rotation fulcrum members 30 and 31. The surface including the two rotation fulcrums formed between the two is close to the rotation locus surface of the rotary magnetic heads Ha and Hb. Then, by rotating the support member SA with the straight line connecting the two rotation fulcrums (the straight line L1 in FIG. 2) as the rotation center, the straight line connecting the two rotation fulcrums (FIG. 2). In the plane that includes the straight line (straight line L2 in FIG. 2) passing through the central axis of the lower drum among the straight lines orthogonal to the straight line L1) and the central axis of the lower drum, the rotation center of the upper drum Du is determined. Even when the fixed shaft 99 described above is tilted, the rotation loci of the rotary magnetic heads Ha and Hb do not largely deviate from the position of the extended surface of the outer peripheral surface of the lower drum Dd, and therefore the support member SA is The fixed shaft 9 is rotated by rotating the two rotating fulcrums 30, 31.
Even if the rotation loci of the rotary magnetic heads Ha and Hb are changed by inclining 9, the contact state between the magnetic gap portions of the rotary magnetic heads Ha and Hb and the magnetic tape T does not deteriorate, and always a good reproduced image. Is obtained. In addition, among the drawing reference numerals used in FIG. 24, the constituent parts indicated by the same drawing reference numerals as those used in FIG. 15 correspond to the constituent parts shown in FIG. It is the constituent part.

FIG. 24 (b) is a sectional view taken along line 0 ° -180 ° in FIG. 24 (a), (b)
At the bearing portion 9 attached to the upper drum Du to which the rotor 92 of the drum drive motor DM is fixed
3, 94 are fitted to the fixed shaft 99 fixed to the support member SA as described above, but the end portion 99a of the fixed shaft 99 is a rectangle formed in the substrate 109. Inserted into the hole 117. The substrate 109 is fixed to the drum base DB with screws 110. When the fixed shaft 99 tilts in a plane including the straight line L2 in FIG. It moves in the rectangular hole 117 while slidingly contacting the side surface of the rectangular hole 117 provided. The end 99a of the fixed shaft 99 inserted into the rectangular hole 117 formed in the substrate 109 and the rectangular hole 117 described above.
A spring 115 is stretched between a stud 116 provided on one side in the longitudinal direction of the shaft, and the end portion 99a of the fixed shaft 99 and the other of the rectangular hole 117 in the longitudinal direction. The operating rod 112 of the plunger 111 provided on the side is connected by a steel wire 113.

Reference numerals 119 and 122 denote stopper mounting members mounted on the above-mentioned substrate 109 with screws 120 and 123.
Adjustment screws 121 and 124 for stoppers are screwed into the respective parts. In addition, the stopper mounting member 11 described above
9 and 122 are provided with a through hole 125 for passing the above-mentioned steel wire 113 or a through hole 126 for allowing the spring 115 to pass through. In the magnetic recording / reproducing apparatus having the configuration illustrated in FIG. 24 described above, it depends on which position of the two operating rods 112 the operating rod 112 is positioned in, which is determined according to the energized state of the plunger 111. , The fixed shaft 99 described above
The peripheral surface of the end 99a of the fixed shaft 99 is positioned by the tip of the adjusting screw 121 for the stopper, and the peripheral surface of the end 99a of the fixed shaft 99 is the adjusting screw 1 for the stopper.
By setting either one of the positioning state by the tip of 24 and the fixed state of the fixed shaft 99 fixed to the support member SA.

In each of the embodiments described so far with reference to the drawings, a structure is provided between the lower drum Dd fixed to the fixing portion of the apparatus and the supporting member SA. The fulcrum of rotation is the lower drum Dd and the supporting member SA described above.
2 in the vertically opposed components of and
Although it is configured by using the three rotary fulcrums members 30 and 31, in implementing the present invention, the lower drum Dd described above,
The rotation fulcrum formed between the support member SA and the lower drum Dd and the support member SA are provided on the two parts of the rotation fulcrum 30, which are opposed to each other in the left-right direction.
Of course, it may be configured to use 31. Further, even when the magnetic tape is intermittently fed to perform slow motion reproduction, by applying the magnetic recording / reproducing apparatus of the present invention, it is possible to easily obtain a good slow motion reproduced image without a noise bar. Nor.

[0105]

As is clear from the above description, in the magnetic recording / reproducing apparatus of the present invention, since the lower drum is fixed to the fixed portion of the apparatus, the reproduction of the magnetic recording / reproducing apparatus is performed. Regardless of the mode, the magnetic tape wound around a part of the peripheral surface of the drum consisting of the upper drum and the lower drum is provided on the outer peripheral surface of the lower drum fixed to the fixed part of the device. In the magnetic recording / reproducing apparatus of the present invention, how the reproduction mode is changed because the magnetic recording / reproducing apparatus of the present invention is in the state of running or stopping on the peripheral surface of the drum while being guided by the guide portion for the reference edge of the magnetic tape. However, even if the position of the reference edge of the magnetic tape is always held at the normal position, the rotation locus of the rotating magnetic head is changed so as to match the recording mark. Reproduced image in Oite also always it is possible to obtain a satisfactory reproduced image having no noise bars. That is, in the magnetic recording / reproducing apparatus of the present invention, in the inner space of the lower drum fixed to the fixed portion of the apparatus, the lower portion is provided only near a specific surface of the surfaces orthogonal to the central axis of the lower drum. While being fitted to the drum, it passes through the center of the winding range of the magnetic tape with respect to the peripheral surface of the drum and the central axis of the lower drum in the plane near the plane including the above-mentioned fitting part Since it is rotatably provided by two rotation fulcrums configured on a straight line, the above-described support member is rotated about a straight line connecting the two rotation fulcrums as a rotation center. By tilting the central axis of the upper drum in a plane that includes the straight axis that passes through the central axis of the lower drum and the central axis of the lower drum among the straight lines that connect the two pivots, Change the position of the rotation trajectory plane to move the rotating magnetic head. It is possible to make it possible to satisfactorily track the recording trace of the magnetic tape, and by changing the inclination of the central axis of the upper drum in accordance with the traveling speed of the magnetic tape, the traveling speed of the magnetic tape can be improved. In any case, a good reproduced image without a noise bar can be obtained. Further, as a mechanism for changing the position of the rotation locus surface of the rotary magnetic head by the inclination of the central axis of the upper drum, an apparatus is provided in which the central axis of the lower drum can be rotated about the rotational center. An annular cam member is disposed between the fixed portion of the cam member and the support member, and the cam contour formed in the circumferential direction of the cam member and the cam follower provided on the support member are in a pressure contact state. By using a structure in which the fixing portion of the above-mentioned device, the support member and the cam member are elastically connected to each other, the two pivot fulcrums described above are formed by pivoting the annular cam member. Orthogonal to the line connecting
Moreover, the inclination angle of the central axis of the upper drum can be precisely and easily changed within the plane including the central axis of the lower drum.

[Brief description of drawings]

FIG. 1 is a perspective view of a magnetic recording / reproducing apparatus of the present invention.

FIG. 2 is a plan view of a drum.

FIG. 3 is a diagram used for explaining a configuration principle and an operation principle of a magnetic recording / reproducing apparatus of the present invention.

FIG. 4 is a sectional view of a magnetic recording / reproducing apparatus of the present invention.

FIG. 5 is an exploded perspective view of a main part.

FIG. 6 is a sectional view of a magnetic recording / reproducing apparatus of the present invention.

FIG. 7 is a diagram used for explaining a configuration principle and an operation principle of a magnetic recording / reproducing apparatus of the present invention.

FIG. 8 is a diagram illustrating a cam member for adjusting the inclination of a rotating shaft.

FIG. 9 is a sectional view of a magnetic recording / reproducing apparatus of the present invention.

FIG. 10 is a sectional view of a magnetic recording / reproducing apparatus of the present invention.

FIG. 11 is a diagram used for explaining a configuration principle and an operation principle of the magnetic recording / reproducing apparatus of the present invention.

FIG. 12 is a sectional view of a magnetic recording / reproducing apparatus of the present invention.

FIG. 13 is a plan view showing a recording trace pattern.

FIG. 14 is a perspective view of a magnetic recording / reproducing apparatus of the present invention.

FIG. 15 is a sectional view of a magnetic recording / reproducing apparatus of the present invention.

FIG. 16 is an exploded perspective view of a main part.

FIG. 17 is a diagram used for explaining a configuration principle and an operation principle of the magnetic recording / reproducing apparatus of the present invention.

FIG. 18 is a sectional view of a magnetic recording / reproducing apparatus of the present invention.

FIG. 19 is a sectional view of a magnetic recording / reproducing apparatus of the present invention.

FIG. 20 is a sectional view of a magnetic recording / reproducing apparatus of the present invention.

FIG. 21 is a diagram used for explaining a configuration principle and an operation principle of the magnetic recording / reproducing apparatus of the present invention.

FIG. 22 is a sectional view of a magnetic recording / reproducing apparatus of the present invention.

FIG. 23 is a sectional view of a magnetic recording / reproducing apparatus of the present invention.

FIG. 24 is a sectional view of a magnetic recording / reproducing apparatus of the present invention.

FIG. 25 is a perspective view of constituent members.

[Explanation of symbols]

DB ... Drum base, Du ... Upper drum, Dd ... Lower drum, DA ... Drum structure, Md, DM ... Drum drive motor, Ha, Hb ... Rotating magnetic head, T ... Magnetic tape, T
e ... Reference edge of magnetic tape, SA ... Support member, CA, CA
c ... An annular cam member (annular cam member) for adjusting the inclination of the rotary shaft (or fixed shaft), G ... Guide portion of the reference edge of the magnetic tape, Mg ... Motor, 1 ... Rotation shaft of the drum drive motor Md, 5, 6 ... Bearing of rotating shaft 1, 7, 95 ... Drum motor mounting substrate, 19 ... Reducer, 20 ... Rotating shaft, 21 ... Pinion, 22 ... Arc rack, 23, 24, 73, 74 ... Rotating transformer, 25 ... Device for detecting rotational position of annular cam member CA, 26, 27 ... Inclined pole, 28, 58, 75 ...
Edges, 30, 31 ... Rotation fulcrum member, 32 ... Screw, 33
... Guide groove, 34 ... Annular portion, 34a, 34b, 61, 6
3, 65, 67, 69, 77b ... Cam contour, 35 ... Coupling portion, 36,37,78,79 ... Cam follower, 38-41
... Spring, 70 ... Projection part of support member SA, 72 ... Intermediate step part of support member, 77 ... Hollow cylindrical body, 92 ... Rotor,
93, 94 ... Bearings, 99 ... Fixed shaft, 100 ... Restraint plate,
105 ... Stator, 106 ... Mounting member, 109 ... Board,
111 ... Plunger, 112 ... Operating rod of plunger 111, 113 ... Steel wire, 114 ... Bearing, 115 ...
Spring, 116 ... Stud, 117 ... Rectangular hole formed in substrate 109, 118 ... Housing of bearing 114, 119, 122 ... Screws 120, 123 in substrate 109
Stopper mounting member, 121,
124 ... adjusting screw for stopper, 125, 126 ... through hole,

Claims (16)

[Claims] 1. A magnetic recording / reproducing apparatus in which a rotating magnetic head is used to perform recording / reproducing operation on a magnetic tape wound around a part of a peripheral surface of a drum composed of an upper drum and a lower drum. A lower drum having a guide portion for the reference edge of the magnetic tape on its surface is fixed to the fixed portion of the device, and a member having a rotary magnetic head attached is rotated in the inner space of the lower drum. A supporting member having a bearing portion for the rotating shaft for causing the rotating drum is provided in such a state that the supporting member is fitted to the lower drum only near a specific surface of the surface orthogonal to the central axis of the lower drum. A straight line passing through the center position of the winding range of the magnetic tape with respect to the peripheral surface of the lower drum and the central axis of the lower drum and lying in a plane orthogonal to the central axis of the lower drum in the first reference direction. And the above-mentioned first reference direction The straight line that is orthogonal to both the straight line and the central axis of the lower drum and that passes through the central axis of the lower drum is the straight line in the second reference direction. In order to achieve the above, the rotation fulcrum formed on the straight line in the first reference direction in the plane in the vicinity of the specific plane where the lower drum and the support member are fitted is used as the rotation center. The support member is fixed to the device so that when the support member is rotated, the rotation shaft can be tilted in a plane including the straight line in the second reference direction and the central axis of the lower drum. A magnetic recording / reproducing device that is elastically connected to and supported by a section. 2. A magnetic recording / reproducing apparatus in which a rotating magnetic head is used to perform a recording / reproducing operation on a magnetic tape wound around a part of a peripheral surface of a drum composed of an upper drum and a lower drum. A lower drum having a guide portion for the reference edge of the magnetic tape on its surface is fixed to the fixed portion of the device, and a member having a rotating magnetic head attached is rotated in the inner space of the lower drum. The supporting member provided with the bearing portion of the rotating shaft for allowing the supporting member to be fitted to the lower drum only near a specific surface of the surface orthogonal to the central axis of the lower drum is described above. Within a plane near the center of the winding range of the magnetic tape with respect to the peripheral surface of the drum and the center axis of the lower drum, and near a specific plane where the lower drum and the supporting member are fitted. 2 on the existing straight line
And a means for elastically connecting and supporting the above-mentioned support member to a fixed portion of the device, the rotation support point being provided between the lower drum and the lower drum so as to be rotatable. Perpendicular to the straight line connecting the two pivots
And, in the plane including the central axis of the lower drum described above,
A magnetic recording / reproducing apparatus comprising: means for variably adjusting the inclination of the rotating shaft. 3. A magnetic recording / reproducing apparatus in which a rotating magnetic head is used to perform a recording / reproducing operation on a magnetic tape wound around a part of a peripheral surface of a drum composed of an upper drum and a lower drum. The lower drum, which has a guide part for the reference edge of the magnetic tape on its surface and has a space inside, is fixed to the fixed part of the device. A specific surface of the support member on which the rotary shaft bearing of the upper drum, on which the rotary magnetic head and the rotary transformer are mounted, and the rotary transformer, which is orthogonal to the central axis of the lower drum. It is fitted to the lower drum only in the vicinity, passes through the center position of the winding range of the magnetic tape with respect to the peripheral surface of the drum and the central axis of the lower drum, and supports the lower drum. Parts and Is provided so as to be rotatable by two rotation fulcrums formed between the lower drum and two positions on a straight line in a plane near the surface where the support member is fitted. Means for elastically connecting and supporting to the fixed part of the above, and further, in the plane orthogonal to the straight line connecting the two rotation fulcrums and including the central axis of the lower drum, the rotation described above. A magnetic recording / reproducing apparatus comprising means for variably adjusting the tilt of the shaft. 4. A magnetic recording / reproducing apparatus in which a rotating magnetic head is used for recording / reproducing operation on a magnetic tape wound around a part of a peripheral surface of a drum composed of an upper drum and a lower drum. The lower drum, which has a guide part for the reference edge of the magnetic tape on its surface and has a space inside, is fixed to the fixed part of the device. A support member having a bearing portion for a rotating shaft for rotating a member to which a magnetic head is attached is fitted to the lower drum only near a specific surface of the above-mentioned surfaces orthogonal to the central axis of the lower drum. And make sure that
A surface which passes through the center position of the winding range of the magnetic tape with respect to the peripheral surface of the drum and the central axis of the lower drum, and near a specific plane where the lower drum and the support member are fitted to each other. It is provided as a rotatable state by a rotation fulcrum formed between the lower drum and two positions on a straight line inside
Furthermore, in the plane orthogonal to the straight line connecting the two rotation fulcrums and including the center axis of the lower drum, the inclination of the rotation axis corresponds to the running speed of the magnetic tape. A magnetic recording / reproducing apparatus comprising means for changing. 5. A magnetic recording / reproducing apparatus in which a rotating magnetic head is used for recording / reproducing operation on a magnetic tape wound around a part of the peripheral surface of a drum composed of an upper drum and a lower drum. A lower drum having a guide portion for the reference edge of the magnetic tape on its surface and a space portion provided inwardly is fixed to the fixing portion of the apparatus, and in the inner space portion of the lower drum described above, A rotary shaft for rotating a member to which a rotary magnetic head is attached, which has a component portion having the same outer diameter dimension as that of the upper and lower drums and protruding from the lower drum. The supporting member provided with the bearing portion of the above is brought into a state of being fitted to the lower drum only near a specific surface of the surface orthogonal to the central axis of the lower drum, and with respect to the peripheral surface of the drum. Center of winding range of magnetic tape Between the lower drum and two positions on a straight line passing through the position and the central axis of the lower drum, and in a plane in the vicinity of the specific plane where the lower drum and the support member are fitted. And a means for elastically connecting and supporting the above-mentioned support member to a fixed portion of the device, the support member being provided in a rotatable state by the configured rotation fulcrum.
A magnetic field which is orthogonal to a straight line connecting the two rotation fulcrums and which makes it possible to variably adjust the inclination of the rotating shaft in a plane including the central axis of the lower drum. Recording / playback device. 6. A magnetic recording / reproducing apparatus in which a recording / reproducing operation is performed by using a rotary magnetic head on a magnetic tape wound around a part of a peripheral surface of a drum composed of an upper drum and a lower drum. A lower drum having a guide portion for the reference edge of the magnetic tape on its surface and a space portion provided inwardly is fixed to the fixing portion of the device, and in the inner space portion of the lower drum described above, In addition to the above-described upper drum having the same outer diameter as that of the lower drum and having a component protruding from the lower drum, the upper drum to which the rotary magnetic head and the rotary transformer are attached The support member to which the bearing of the rotary shaft and the rotary transformer are attached is brought into a state of being fitted to the lower drum only near a specific surface of the surface orthogonal to the central axis of the lower drum, The above In the plane near the center of the winding range of the magnetic tape with respect to the peripheral surface of the ram and the center axis of the lower drum, and in the vicinity of a specific plane where the lower drum and the support member are fitted. Means for elastically connecting and supporting the above-mentioned support member to a fixed portion of the device, the support member being provided in a rotatable state by a rotation fulcrum formed between the lower drum and the two positions on a straight line; Also, the above 2
A magnetic recording / reproducing apparatus including means for variably adjusting the inclination of the rotating shaft in a plane orthogonal to the straight line connecting the rotation fulcrums and including the central axis of the lower drum. . 7. A magnetic recording / reproducing apparatus in which a rotating magnetic head is used to perform recording / reproducing operation on a magnetic tape wound around a part of a peripheral surface of a drum composed of an upper drum and a lower drum. A lower drum having a guide portion for the reference edge of the magnetic tape on its surface and a space portion provided inward is fixed to the fixing portion of the device, and in the inner space portion of the lower drum described above, A rotary shaft for rotating a member to which a rotary magnetic head is attached, which has a component portion having the same outer diameter dimension as that of the upper and lower drums and protruding from the lower drum. The supporting member having the bearing portion of the above is brought into a state of being fitted to the lower drum only in the vicinity of a specific surface of the surface orthogonal to the central axis of the lower drum, and with respect to the peripheral surface of the drum. Center of winding range of magnetic tape Between the lower drum and two positions on a straight line passing through the position and the central axis of the lower drum, and in a plane in the vicinity of the specific plane where the lower drum and the support member are fitted. And a means for elastically connecting and supporting the above-mentioned support member to a fixed portion of the device, the support member being provided in a rotatable state by the configured rotation fulcrum.
A means for changing the inclination of the rotating shaft in a plane orthogonal to the straight line connecting the two rotation fulcrums and including the central axis of the lower drum in correspondence with the running speed of the magnetic tape; A magnetic recording / reproducing apparatus comprising: 8. A magnetic recording / reproducing apparatus in which a rotating magnetic head is used to perform recording / reproducing operation on a magnetic tape wound around a part of a peripheral surface of a drum composed of an upper drum and a lower drum. A lower drum having a guide portion for the reference edge of the magnetic tape on its surface is fixed to the fixed portion of the device, and a member having a rotary magnetic head attached is rotated in the inner space of the lower drum. A supporting member having a bearing portion for the rotating shaft for causing the rotating drum is provided in such a state that the supporting member is fitted to the lower drum only near a specific surface of the surface orthogonal to the central axis of the lower drum. A straight line passing through the center position of the winding range of the magnetic tape with respect to the peripheral surface of the lower drum and the central axis of the lower drum and lying in a plane orthogonal to the central axis of the lower drum in the first reference direction. And the above-mentioned first reference direction The straight line that is orthogonal to both the straight line and the central axis of the lower drum and that passes through the central axis of the lower drum is the straight line in the second reference direction, and the inclination mode of the rotation trajectory surface of the rotary magnetic head is changed. In order to achieve the above, the rotation fulcrum formed on the straight line in the first reference direction in the plane in the vicinity of the specific plane where the lower drum and the support member are fitted is used as the rotation center. The support member is fixed to the device so that when the support member is rotated, the rotation shaft can be tilted in a plane including the straight line in the second reference direction and the central axis of the lower drum. An annular cam between the fixing portion of the device and the above-mentioned supporting member in such a manner that the means for elastically connecting and supporting the lower drum with the central axis of the lower drum can be rotated. The members are arranged and the cam members are structured in the circumferential direction. The fixed portion of the device described above is elastically connected to the support member and the cam member so that the cam contour and the cam follower provided on the support member are in pressure contact with each other. A magnetic field which is perpendicular to a straight line connecting the above-mentioned two rotation fulcrums and which changes the inclination of the rotating shaft in a plane including the central axis of the lower drum when moving. Recording / playback device. 9. A magnetic recording / reproducing apparatus in which a rotating magnetic head is used to perform recording / reproducing operation on a magnetic tape wound around a part of a peripheral surface of a drum composed of an upper drum and a lower drum. The lower drum having a guide portion for the reference edge of the magnetic tape on the surface is fixed to the fixed portion of the device, and the rotor of the drum drive motor is integrally fixed to the inner space of the lower drum. The above-mentioned support member has a fixed shaft for fixing the rotation center position of the upper drum by mounting a bearing fixed to the upper drum to which the rotary magnetic head is attached. Provided in a state of being fitted to the lower drum only near a specific surface of the surface orthogonal to the central axis of the lower drum, the center position of the winding range of the magnetic tape with respect to the peripheral surface of the drum described above and the lower drum. Passes through the central axis, The straight line in the plane orthogonal to the central axis of the lower drum described above as the straight line in the first reference direction,
Further, a straight line orthogonal to both the straight line in the first reference direction and the central axis of the lower drum and passing through the central axis of the lower drum is set as a straight line in the second reference direction, and In order to change the inclination of the rotation trajectory plane,
The support member is configured with a rotation fulcrum formed on a straight line in the first reference direction in a plane in the vicinity of a specific plane where the lower drum and the support member are fitted as a rotation center. When rotated, the fixed shaft for determining the rotation center position of the upper drum can be tilted in a plane including the straight line in the second reference direction and the center axis of the lower drum,
A magnetic recording / reproducing apparatus in which the above-mentioned supporting member is elastically connected to and supported by a fixed portion of the apparatus. 10. A magnetic recording / reproducing apparatus in which a rotating magnetic head is used to perform a recording / reproducing operation on a magnetic tape wound around a part of a peripheral surface of a drum composed of an upper drum and a lower drum. The lower drum, which has a guide part for the reference edge of the magnetic tape on the surface, is fixed to the fixed part of the device,
The rotor of the drum drive motor is integrally fixed to the inner space of the lower drum described above, and the bearing fixed to the upper drum to which the rotary magnetic head is attached is fitted. The supporting member having a fixed shaft for fixing the rotation center position of the upper drum is fixed to the lower drum only near a specific surface of the above-mentioned surfaces orthogonal to the central axis of the lower drum. And a specific position in which the lower drum and the support member are fitted to each other while passing through the center position of the winding range of the magnetic tape with respect to the peripheral surface of the drum and the central axis of the lower drum. It is provided so as to be rotatable by two rotation fulcrums formed between it and the lower drum at two positions on a straight line within a plane near the plane, and further, the above-mentioned support member is attached to a fixed portion of the device. Means for spontaneously connecting and supporting , The inclination of the fixed shaft for determining the rotation center position of the upper drum can be variably adjusted in a plane orthogonal to the straight line connecting the two rotation fulcrums and including the central axis of the lower drum. And a magnetic recording / reproducing apparatus. 11. A magnetic recording / reproducing apparatus in which a rotating magnetic head is used for recording / reproducing operation on a magnetic tape wound on a part of a peripheral surface of a drum composed of an upper drum and a lower drum. The lower drum, which has a guide portion for the reference edge of the magnetic tape on its surface and has an inner space portion, is fixed to the fixed portion of the device, and the inner space portion of the lower drum is , The rotor of the drum drive motor is integrally fixed, and the bearing fixed to the upper drum on which the rotary magnetic head and the rotary transformer are mounted is fitted to determine the rotation center position of the upper drum. The supporting member having a fixed shaft to be fixed is fitted to the lower drum only in the vicinity of a specific surface of the surface of the lower drum, which is orthogonal to the central axis of the lower drum. Magnetism around the surface 2 on a straight line passing through the center position of the winding range of the air tape and the central axis of the lower drum and in the plane near the surface where the lower drum and the support member are fitted to each other.
Means for elastically connecting and supporting the above-mentioned support member to a fixed portion of the apparatus, the rotary member being provided in a rotatable state by a rotation fulcrum formed between the lower drum and the lower drum at one position. It is possible to variably adjust the inclination of the fixed shaft that should determine the rotation center position of the upper drum in a plane that is orthogonal to the straight line connecting the two rotation fulcrums and that includes the central axis of the lower drum. And a magnetic recording / reproducing apparatus. 12. A magnetic recording / reproducing apparatus in which a rotating magnetic head is used to perform a recording / reproducing operation on a magnetic tape wound around a part of a peripheral surface of a drum composed of an upper drum and a lower drum. The lower drum, which has a guide portion for the reference edge of the magnetic tape on its surface and has a space portion inside, is fixed to the fixed portion of the device, and the inner space portion of the lower drum described above includes a drum. The rotor of the drive motor is integrally fixed, and a fixed shaft for fixing the rotation center position of the upper drum is fixed by fitting a bearing fixed to the upper drum to which the rotary magnetic head is attached. The supporting member is made to fit into the lower drum only near a specific surface of the surface orthogonal to the central axis of the lower drum, and the magnetic tape is attached to the peripheral surface of the drum. Center of winding range And the central axis of the lower drum,
Also, the lower drum and the supporting member can be freely rotated by two rotation fulcrums formed between the lower drum and the lower drum at two positions on a straight line in a plane in the vicinity of a specific plane. Fixed in such a state that the rotation center position of the upper drum is determined in a plane that is orthogonal to the line connecting the two rotation fulcrums and includes the center axis of the lower drum. A magnetic recording / reproducing apparatus comprising: means for changing the inclination of the shaft in accordance with the running speed of a magnetic tape. 13. A magnetic recording / reproducing apparatus in which a rotating magnetic head is used for recording / reproducing operation on a magnetic tape wound around a part of a peripheral surface of a drum composed of an upper drum and a lower drum. A lower drum having a guide portion for the reference edge of the magnetic tape on its surface and a space portion provided inwardly is fixed to the fixing portion of the apparatus, and in the inner space portion of the lower drum described above, As described above, it has a component portion having the same outer diameter dimension as that of the lower drum and protruding from the lower drum, and the rotor of the drum drive motor is integrally fixed, The central shaft of the lower drum is a support member having a fixed shaft fixed to the upper drum to which the rotary magnetic head is attached and having a fixed shaft for fixing the rotation center position of the upper drum fixed thereto. Within the plane orthogonal to While being fitted to the lower drum only near a fixed surface, it passes through the central position of the winding range of the magnetic tape with respect to the peripheral surface of the drum and the central axis of the lower drum, and The lower drum and the support member are provided in a rotatable state by two pivotal fulcrums formed between the lower drum and the lower drum at two positions on a straight line in a plane in the vicinity of a specific plane. A means for elastically connecting and supporting the support member to a fixed part of the apparatus, and further including a central axis of the lower drum which is orthogonal to a straight line connecting the two rotation fulcrums. A magnetic recording / reproducing apparatus provided with means for variably adjusting the inclination of the fixed shaft for determining the rotation center position of the upper drum in the plane. 14. A magnetic recording / reproducing apparatus in which a rotating magnetic head is used for recording / reproducing operation on a magnetic tape wound around a part of a peripheral surface of a drum composed of an upper drum and a lower drum. The lower drum having a guide portion for the reference edge of the magnetic tape on its surface and having a space portion inwardly is fixed to the fixing portion of the device, and the inner space portion of the lower drum described above, As described above, it has a component portion having the same outer diameter dimension as that of the lower drum and protruding from the lower drum, and the rotor of the drum drive motor is integrally fixed, A support member having a fixed shaft fixed to the upper drum, on which the rotary magnetic head and the rotary transformer are mounted, is fixed to fix the rotation center position of the upper drum. Drum center While being fitted to the lower drum only in the vicinity of a specific surface of the surface orthogonal to the axis, the central position of the winding range of the magnetic tape with respect to the peripheral surface of the drum and the central axis of the lower drum. And a rotation fulcrum formed between the lower drum and the lower drum at two positions on a straight line within a plane near a specific plane where the lower drum and the support member are fitted to each other. Provided as a movable state,
Further, means for elastically connecting and supporting the above-mentioned supporting member to the fixing portion of the apparatus, and a plane orthogonal to a straight line connecting the above-mentioned two rotation fulcrums and including the above-mentioned central axis of the lower drum. And a means for variably adjusting the inclination of the fixed shaft for determining the rotational center position of the upper drum. 15. A magnetic recording / reproducing apparatus in which a rotating magnetic head is used to perform a recording / reproducing operation on a magnetic tape wound around a part of a peripheral surface of a drum composed of an upper drum and a lower drum. A lower drum having a guide portion for the reference edge of the magnetic tape on its surface and a space portion provided inward is fixed to the fixing portion of the device, and in the inner space portion of the lower drum described above, As described above, it has a component portion having the same outer diameter dimension as that of the lower drum and protruding from the lower drum, and the rotor of the drum drive motor is integrally fixed, The central shaft of the lower drum is a support member having a fixed shaft fixed to the upper drum to which the rotary magnetic head is attached and having a fixed shaft for fixing the rotation center position of the upper drum fixed thereto. Within the plane orthogonal to While being fitted to the lower drum only near a fixed surface, it passes through the central position of the winding range of the magnetic tape with respect to the peripheral surface of the drum and the central axis of the lower drum, and The lower drum and the support member are provided in a rotatable state by two pivotal fulcrums formed between the lower drum and the lower drum at two positions on a straight line in a plane in the vicinity of a specific plane. A means for elastically connecting and supporting the support member to a fixed part of the apparatus, and further including a central axis of the lower drum which is orthogonal to a straight line connecting the two rotation fulcrums. A magnetic recording / reproducing apparatus comprising: a means for changing the inclination of the fixed shaft for determining the rotation center position of the upper drum in the plane in correspondence with the running speed of the magnetic tape. 16. A magnetic recording / reproducing apparatus in which a recording / reproducing operation is performed by using a rotary magnetic head on a magnetic tape wound around a part of a peripheral surface of a drum composed of an upper drum and a lower drum. The lower drum, which has a guide for the reference edge of the magnetic tape on the surface, is fixed to the fixed part of the device,
The rotor of the drum drive motor is integrally fixed to the inner space of the lower drum, and the bearing fixed to the upper drum to which the rotary magnetic head is attached is fitted. The support member having a fixed shaft for fixing the rotation center position of the upper drum is fixed to the lower drum only near a specific surface of the above-mentioned surfaces orthogonal to the central axis of the lower drum. A straight line that passes through the central position of the winding range of the magnetic tape with respect to the peripheral surface of the drum and the central axis of the lower drum, and is in a plane orthogonal to the central axis of the lower drum. A straight line in the first reference direction, which is orthogonal to both the straight line in the first reference direction and the center axis of the lower drum and which passes through the center axis of the lower drum in the second reference direction. Rotation of the rotating magnetic head described above as a straight line Rotation configured on a straight line in the first reference direction in a plane in the vicinity of a specific plane where the lower drum and the support member are fitted to each other in order to change the inclination mode of the trace surface. When the support member is rotated about a fulcrum as a rotation center, the fixed shaft for determining the rotation center position of the upper drum includes the straight line in the second reference direction and the center shaft of the lower drum. By means of elastically connecting and supporting the above-mentioned supporting member to the fixing portion of the apparatus so that the supporting member can be tilted in the plane, and a mode in which the central axis of the lower drum can be rotated about the central axis. An annular cam member is arranged between the fixed portion of the device and the support member, and the cam contour formed in the circumferential direction of the cam member and the cam follower provided on the support member are in pressure contact with each other. In order to achieve In a plane that is elastically connected to the member and is orthogonal to the line connecting the two rotation fulcrums at the time of rotation of the annular cam member, and that includes the central axis of the lower drum. A magnetic recording / reproducing apparatus comprising: tilt adjusting means for changing the tilt of a fixed shaft for determining the rotation center position of the upper drum.