JP3141644B2 - Magnetic recording / reproducing device - Google Patents

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 rotary magnetic head provided such that a rotational trajectory surface is formed at a predetermined position with respect to a fixed portion of a body of the magnetic recording / reproducing apparatus. As a result, recording and reproducing operations are performed on the magnetic tape wound around a part of the drum peripheral surface, and the magnetic tape to be wound around the part of the drum peripheral surface starts winding on the drum peripheral surface. The height of the first and second guide poles individually arranged in the traveling path between the first guide pole and the winding end side is a position close to the first guide pole obtained based on the reproduction signal from the magnetic tape. The recording of the magnetic tape on the rotation locus of the rotary magnetic head is performed by a height control signal generated using the bending information of the recording trace at the position and the bending information of the recording trace at a position near the second guide pole. Traces match A magnetic recording and reproducing apparatus is provided with a height control mechanism for controlling the.

[0002]

2. Description of the Related Art A magnetic tape wound around a part of the peripheral surface of a drum is caused to run at a predetermined running speed, and a specific recording mark pattern (tape pattern) corresponding to the rotation locus of a rotating magnetic head is obtained. ) Is formed on a magnetic tape to perform a recording / reproducing operation, and is widely used as a video tape recorder (VTR). The above-described tape pattern has a specific format for each magnetic recording / reproducing method employed in the magnetic recording / reproducing apparatus, but is designed to operate according to the same magnetic recording / reproducing method. Even with a standard magnetic recording / reproducing device, due to the variation due to the permissible manufacturing error and other causes, each magnetic recording / reproducing device is formed on a magnetic tape corresponding to the rotation locus of the rotating magnetic head. Each tape pattern is usually different.

As described above, since the tape pattern formed on the magnetic tape is different for each magnetic recording / reproducing device, the recorded magnetic tape recorded by the magnetic recording / reproducing device is used for recording. This may be a problem when performing a recording / reproducing operation in a magnetic recording / reproducing device other than the magnetic recording / reproducing device, that is, a so-called compatible recording / reproducing operation. When the track pattern is formed by the recording trace, a serious trouble may occur during the compatible recording / reproducing operation. For example, recently, a new form in which recording and reproduction of so-called high-vision image information can be realized by simultaneously recording three recording marks having a recording mark width of 19 μm on the magnetic tape T in parallel. VTR (what is called W
-VHS type VTR) has been proposed. In this new type of VTR, two adjacent recording marks among three recording marks formed in parallel on the magnetic tape T at the same time are opposite to each other. It is used for recording and reproducing video signals by two rotating magnetic heads having an azimuth angle.
The remaining one recording trace is used for recording and reproducing of an audio signal by another rotating magnetic head, and the recording can be performed by the rotating magnetic head for recording and reproducing the acoustic signal.

[0004] By the way, the allowable value of bending in one recording mark in the above-mentioned VTR is set to about 7 µm. Therefore, when, for example, after-recording is performed by a compatible recording / reproducing operation, the recorded magnetic tape is not recorded. A maximum of 1 between the recording trace and the rotation locus of the rotating magnetic head
There is a possibility that a deviation of about 4 μm may occur. However, if a deviation of 14 μm occurs between the recording trace of the recorded magnetic tape and the rotation locus of the rotating magnetic head as described above, the recording is performed. A rotary magnetic head for recording / reproducing an acoustic signal to be subjected to after-recording for a recording trace of an acoustic signal on a magnetic tape is provided for recording a video signal adjacent to the recording trace for recording an acoustic signal on the recorded magnetic tape by 14 μm. 19
A portion having a width of 14 μm in a recording trace for recording a video signal having a recording trace width of μm is overwritten by an audio signal for after recording, and a recording portion of an original video signal having a width of 5 μm is formed. Only the width portion is left, and the quality of the reproduced video signal is degraded.

[0005] To solve the above-mentioned problems,
What is necessary is to make the rotation locus of the rotating magnetic head coincide with the recording trace of the magnetic tape T. An electromechanical conversion element (for example, a voice coil motor) conventionally used as an actuator in an open loop control circuit or a closed loop control circuit , A bimorph of an electrostrictive element) by driving displacement by a magnetic head driving device configured using
The rotating magnetic head can be traced to the recording mark of the magnetic head.
No. 6, JP-A-61-158633, and the like, the rotating drum on which the rotating magnetic head is mounted and the lower drum are integrally inclined, so that the rotating head has a recording mark on the magnetic tape T. Or the height of the guide pole is changed by a laminated piezoelectric element, as disclosed in, for example, Japanese Patent Application Laid-Open No. 60-115043.
As disclosed in Japanese Patent Publication No. 51, a gear is fixed to a shaft of a guide pole having a screw portion, and the height of the guide pole is changed by rotating the gear with a motor, and various other operations are performed. Solutions have been proposed.

[0006]

However, since about two rotary magnetic heads can be mounted on a single magnetic head drive device having a small size, an acoustic signal is recorded by a so-called deep recording method, for example. It is difficult to mount an audio head used for reproduction on the drive of the magnetic head, and the magnetic head drive is very expensive. The solution is a consumer VTR that needs to be inexpensive
In the magnetic recording / reproducing apparatus in which the rotating drum and the lower drum are integrally inclined so that the rotating head can track the recording trace of the magnetic tape T as in the above-mentioned solution, The disadvantage is that a large driving force is required to incline a member with a large mass, and furthermore, in the above-mentioned solution, the laminated piezoelectric element can obtain only a displacement of several microns with a driving voltage of several hundred volts. It is not practical because it is not provided, and it is extremely difficult to provide a motor and gears on a pole base that is moved during a loading operation. Therefore, a solution without the above-mentioned problems was required.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and a first invention is a drum which rotates integrally with a rotating magnetic head while winding a magnetic tape around a part of a peripheral surface. A first guide pole having a flange for regulating the height direction of the magnetic tape, the first guide pole being movably supported in the height direction of the magnetic tape, and a first guide pole paired with the first guide pole. A first pole base that supports the inclined pole, pulls out the magnetic tape from the cassette, and moves to the winding start side around the drum peripheral surface, and a flange that regulates the height direction of the magnetic tape. Supporting a second guide pole movably in the height direction of the magnetic tape;
And a second pole base that supports a second inclined pole paired with the second guide pole, pulls out the magnetic tape from the cassette, and moves to the end of winding on the peripheral surface of the drum, When loading onto the magnetic tape is completed, the magnetic tape is partially fixed to the peripheral surface of the drum by the first guide pole and the first inclined pole, and the second guide pole and the second inclined pole. During the recording mode, the height of each flange of the first and second guide poles is set to a regular height in the recording mode, while the height is obtained based on the reproduction signal from the magnetic tape in the reproduction mode. The first and second guide control poles are used in response to the height control signals generated using the information on the curvature of the recording trace at a position near the first guide pole and the information on the curvature of the recording trace at a position near the second guide pole. A height control mechanism for the first and second guide poles for controlling the height of each flange of the second guide pole so that the recording trace of the magnetic tape matches the rotation locus of the rotary magnetic head. The height control mechanism of the first and second guide poles is configured to connect each screw portion of each first power transmission member fixed to each shaft of the first and second guide poles to the first and second guide poles. Each second turning power transmission member is screwed into each screw hole screwed in the second pole base and coupled to each of the first turning power transmission members when the loading operation is completed. The motor, the second power transmission member, and the first power transmission member are rotatably provided on the fixed portion side by the driving force of each motor, and each of the motors, the second power transmission members, and the first power transmission members are rotated by the height control signals. , The first and second guide poles A magnetic recording and reproducing apparatus characterized by controlling the height of each flange to the height direction of the magnetic tape. According to a second aspect of the present invention, in the magnetic recording / reproducing apparatus according to the first aspect, each of the first rotational power transmission member and the second rotational power transmission member has a reference position detecting means. And each of the motors is provided with a rotary encoder.

[0008]

The rotating magnetic head, which is driven and rotated so that the position of the rotation locus plane occupies a predetermined position with respect to the fixed portion of the body of the magnetic recording / reproducing apparatus, is wound around a part of the drum peripheral surface. Record signals on a magnetic tape,
It plays back recorded signals. The running path of the magnetic tape on the drum peripheral surface of the magnetic tape wound around a part of the drum peripheral surface is a first guide disposed in the running path of the magnetic tape on the winding start side on the drum peripheral surface. The height can be changed by changing the height of the pole and the height of the second guide pole disposed in the running path of the magnetic tape on the end side of the drum peripheral surface, based on the reproduction signal from the magnetic tape. The obtained bending information of the recording trace at a position close to the first guide pole and the second
The height of the recording track at a position close to the guide pole is generated by using a height control signal, and the recording trace of the magnetic tape is aligned with the rotation locus of the rotating magnetic head. The height of the second guide pole is changed by the height control mechanism.

A first power transmission member is fixed to a shaft of a guide pole provided with a screw portion to be screwed into a screw hole screwed into a pole base provided in the loading mechanism. In the state where the loading operation is completed, a second rotation power transmission member coupled to the first rotation power transmission member is provided on the fixed portion side of the body, and a height control signal is provided to the second rotation power transmission member. In the magnetic recording / reproducing apparatus provided with a guide pole height control mechanism configured to give a driving force of a motor driven by a motor, a first rotating power transmission member provided on a loading mechanism side; And a second rotating power transmitting member provided on the fixed portion side of the second rotating power transmitting member when the loading operation is completed, and the driving force of the motor driven by the height control signal is changed to the second rotating power transmitting portion. From is transmitted to the first turning force transmitting member.

The first rotating power transmission member is fixed to a shaft of a guide pole provided with a screw portion to be screwed into a screw hole screwed into a pole base provided in the loading mechanism. Therefore, the shaft of the guide pole is displaced vertically in the screw hole screwed into the pole base by the turning operation of the first turning power transmission member. Therefore, the height of the first and second guide poles is
The position of the magnetic tape traveling path is changed so that the recording trace of the magnetic tape matches the rotation trajectory of the rotary magnetic head in accordance with the rotation operation of the first rotation power transmission member. Further, by using a reference position signal obtained from a reference position detecting means provided on either the first rotating power transmitting member or the second rotating power transmitting member and an output signal from a rotary encoder provided on the motor. , And the heights of the first and second guide poles can be set with high accuracy.

[0011]

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a magnetic recording / reproducing apparatus according to the present invention. FIGS. 1, 3, 5 to 9 and 12 are perspective views showing different configurations of the magnetic recording / reproducing apparatus according to the present invention, and FIGS. 2, 4, 10, 11 and 13 and FIG. FIG. 3 is a diagram showing details of some components of the magnetic recording / reproducing apparatus of the present invention. FIGS. 1, 3, 5 to 9 and 12 showing perspective views of different configurations of the magnetic recording / reproducing apparatus of the present invention are shown in FIGS. On the other hand, recording and recording on a magnetic tape wound around a part of the drum peripheral surface by a rotating magnetic head provided so that a rotation trajectory surface is formed at a predetermined position.
A reproducing operation is performed, and the first and first magnetic tapes to be wound around a part of the drum peripheral surface are individually arranged on a traveling path between a winding start side and a winding end side around the drum peripheral surface.
The height of the second guide pole is determined based on the read signal from the magnetic tape, and the information on the curvature of the recording trace at a position near the first guide pole and the position at the position near the second guide pole. A magnetic recording / reproducing apparatus having a height control mechanism for controlling a recording track of a magnetic tape to match a rotation track of the rotary magnetic head with a height control signal generated using the bending information of the recording track. 2 shows a schematic configuration of a part of.

In each of the drawings, DB is a drum base, and the drum base DB is fixed to a fixed portion of the body of the magnetic recording / reproducing apparatus.
B is also a component that functions as a fixing part of the body of the magnetic recording / reproducing apparatus. Dd is a lower drum integrally formed with the drum base DB, and Du is an upper drum, and the upper drum Du and the lower drum Dd form a drum structure. In the following description, it is assumed that the upper drum Du is a rotating drum. H is a rotating magnetic head that rotates at a predetermined number of revolutions in the gap G between the upper drum Du and the lower drum Dd, and the rotating magnetic head H is fixed with respect to a fixed portion of the body of the magnetic recording / reproducing apparatus. Is formed at the position of. Needless to say, a required number of rotating magnetic heads H are used according to the magnetic recording / reproducing method applied to the magnetic recording / reproducing apparatus.

Further, BC is a base catcher,
This bass catcher BC is the drum base D described above.
B. When the loading operation of the magnetic tape performed by the loading mechanism is completed, the magnetic tape is wound in a predetermined range on the outer peripheral surface of the upper drum Du and the lower drum Dd constituting the drum assembly DA. Is done. The loading mechanism pulls out the magnetic tape housed in the magnetic tape cassette during the loading operation, and in a state where the loading operation is completed, the magnetic tape wound around a part of the drum peripheral surface. A first guide pole disposed in a traveling path on a winding start side around a drum peripheral surface;
In cooperation with the guide pole, the magnetic tape housed in the magnetic tape cassette is pulled out, and when the loading operation is completed, the drum circumference of the magnetic tape wound around a part of the drum circumferential surface is removed. A second guide pole arranged in the traveling path on the winding end side of the surface and an inclined pole paired with each of the first and second guide poles are provided. It has two pole bases PB.

The two pole bases PB are fixed to, for example, a link constituting a loading mechanism, and can move along a predetermined moving path from the position of the magnetic tape cassette to the position of the drum structure DA. It has such a configuration. When the loading operation of the magnetic tape by the loading mechanism (not shown) is completed, the pole base PB is configured to transfer the magnetic tape to the upper drum Du and the lower drum Dd constituting the drum assembly DA in advance. The pole base PB provided with the first guide pole and the inclined pole paired with the first guide pole so that the first base pole is wound in a predetermined range, the tip end of the pole base PB has the pole base PB. The first guide pole and the inclined pole paired with the first guide pole are wound around a part of the drum peripheral surface by being positioned by being engaged with a base catcher BC provided correspondingly to the first guide pole. The magnetic tape is arranged at a predetermined position in the traveling path on the side of the winding start side of the drum peripheral surface, and the second guide pole and the paired tilt are paired with the second guide pole. The pole base PB towards the poles and is provided, by which it tip portion is positioned in engagement with the base catcher BC provided in correspondence with the pole base PB,
The second guide pole and the inclined pole forming a pair with the second guide pole are arranged at predetermined positions in a running path on the end side of the drum peripheral surface of the magnetic tape wound around a part of the drum peripheral surface. State.

A pole base PB provided in the loading mechanism shown in FIGS. 1, 3, 5 to 9 and 12 is composed of a second guide pole and a pair of inclined poles. And a pole base PB provided with a first guide pole and a pair of inclined poles in the figures.
Is not shown. That is, the pole base PB provided with the first guide pole and the inclined pole paired with the first guide pole, and the first guide pole provided on the pole base PB and the paired inclined pole are drums. It is not shown because it exists on the opposite side of the structure DA. However, in the magnetic recording / reproducing apparatus shown in each of the drawings, the control mechanism for the height of the first guide pole and the control mechanism for the height of the second guide pole are respectively used. In the following description, since the magnetic tape has the same configuration, it is wound around a part of the drum surface when the loading operation of the magnetic tape by the loading mechanism is completed. A pole base P provided with a second guide pole disposed at a predetermined position in a running path on the end surface side of the drum peripheral surface of the wound magnetic tape and a pair of inclined poles with the second guide pole
B, and a description of only the control mechanism for the height of the second guide pole, using terms such as simply the guide pole without distinguishing between the first and second guide poles. Sometimes expressed. The position of the magnetic tape on the running path of the peripheral surface of the drum is determined by the height of the lower flange 7 of the first and second guide poles. Instead of the expression of the height of the lower flange 7, it may be expressed as the height of the first and second guide poles or the height of the guide poles.

First, in the magnetic recording / reproducing apparatus shown in FIG. 1, GP is a guide pole and SP is a tilt pole.
(A) shows a top view of the pole base PB, the guide pole GP, the inclined pole SP, and the magnetic tape T.
FIG. 2B is a longitudinal sectional view of the guide pole GP. Reference numeral 1 denotes a guide pole shaft. The guide pole shaft 1 is inserted into a hole 2 formed in the pole base PB near the lowermost end thereof. The moving direction of the shaft 1 is guided.
A projection 3 functioning as a first power transmission member is fitted and fixed to the shaft 1 of the guide pole,
A screw 4a is formed on the outer periphery of the cylindrical portion 4 provided below the base of the projection 3 described above. The screw 4a formed in the cylindrical portion 4 is a pole base PB.
Is screwed into the female screw 5 provided in the above. Female screw 5 mentioned above
Is set to be longer than the screw 4a formed in the cylindrical portion 4, the shaft 1 of the guide pole is rotated in the direction of the center line of the shaft 1 of the guide pole. It can be displaced.

The projection 3 functioning as the first power transmitting member shown in FIG. 2 is a plate member whose width gradually decreases from the base to the tip in a planar shape, and is below the base. The screw 4a is formed on the outer periphery of the cylindrical portion 4 provided in the pole base P.
A screw to be screwed into the female screw 5 provided in B may be provided on the outer peripheral portion of the shaft 1 of the guide pole. 6,
Reference numeral 7 denotes upper and lower flanges fixed to the guide pole shaft 1, and reference numeral 8 denotes a roller having a length equal to the width of the magnetic tape T. M is a motor, and a pulse motor is used as the motor M, for example. Motor M
A gear 10 is fixed to the rotating shaft 9 of the gear, and the gear 10 functions as a second rotating power transmission member.
Are engaged. Reference numeral 12 denotes a rotation shaft of the gear 11 functioning as the second power transmission member. And
The gear 11 functioning as the second power transmission member described above.
Is formed with a notch 13 that can be engaged with the projection 3 functioning as the first power transmission member described above.

The operation of the loading mechanism (not shown) causes the pole base PB to move along the predetermined movement path from the position of the magnetic tape cassette to the position of the drum assembly DA, and the loading operation of the magnetic tape by the loading mechanism is performed. In the completed state, when the distal end portion 14 of the pole base PB is positioned by engaging with the base catcher BC provided corresponding to the pole base PB, the first turning power transmission member is used. The functioning projection 3 enters into the notch 13 of the gear 11 functioning as the second rotational power transmission member, and the tip 14 of the pole base PB is provided corresponding to the pole base PB. Base catcher B
In the state in which the positioning is completed by engaging with C, the protrusion 3 functioning as the first power transmission member described above;
The notch 13 of the gear 11 functioning as the second power transmission member is properly engaged. In this state, the height of the lower flange 7 of the guide pole, which is determined by the rotation angle of the projection 3 functioning as the first rotation power transmission member, is a regular height determined for the magnetic recording apparatus. It is determined in.

As described above, the tip 1 of the pole base PB
4 completes the loading operation of the magnetic tape by the loading mechanism which is positioned by engaging with the base catcher BC provided corresponding to the pole base PB, and functions as the first power transmission member described above. The rotation angle of the projection 3 functioning as the first rotation power transmission member in a state where the notch 13 of the gear 11 functioning as the second rotation power transmission member is properly engaged with the protrusion 3 A state in which the height of the lower flange 7 of the guide pole determined by the position is arranged at a predetermined position in the traveling path on the start side of winding on the drum peripheral surface of the magnetic tape wound on a part of the drum peripheral surface. The lower flange 7 of the first guide pole and the predetermined position in the running path of the magnetic tape wound around a part of the drum peripheral surface on the winding end side of the drum peripheral surface. When each of the lower flanges 7 of the second guide poles in the placed state is set to a regular height determined for the magnetic recording apparatus, the magnetic recording apparatus operates in the recording mode in this state. Then, a recorded magnetic tape having a standard recording trace pattern can be obtained.

The magnetic tape traveling path on the drum peripheral surface of the magnetic tape wound around a part of the drum peripheral surface is arranged in the magnetic tape traveling path on the winding start side on the drum peripheral surface. By changing the height of the lower flange 7 of the first guide pole and the height of the lower flange 7 of the second guide pole disposed in the running path of the magnetic tape at the end of winding of the drum peripheral surface. When the loading operation of the magnetic tape by the loading mechanism is completed, the predetermined position in the traveling path on the start side of the winding of the magnetic tape around the drum peripheral surface of the magnetic tape wound on a part of the drum peripheral surface as described above can be changed. And a state where the first guide pole is disposed at a predetermined position in the running path on the end side of the winding of the drum peripheral surface of the magnetic tape wound around a part of the drum peripheral surface. The second The height of the lower flange 7 is set to a regular height determined for the magnetic recording device with respect to each of the id poles, and the above-mentioned second position is set when the magnetic recording / reproducing device is in the reproducing mode. The height control signal generated by using the bending information of the recording trace at the position near the first guide pole obtained based on the reproduction signal from the magnetic tape to determine the height of the lower flange 7 of the first guide pole The height of the lower flange 7 of the second guide pole is set at a position close to the second guide pole obtained based on a reproduction signal from the magnetic tape. The height control signal generated by using the bending information of the recording trace is changed by a height control mechanism to record the magnetic tape on the rotation locus of the rotary magnetic head. By performing a control operation such marks fit, it is possible to realize good reproduction operation.

That is, the normal recording mark bend appearing in the recording trace of the recorded magnetic tape to be reproduced in the magnetic recording / reproducing apparatus is S-shaped, and the S-shaped bend of the recording trace is the drum peripheral surface. The height of the lower flange of the first guide pole (the magnetic tape) which is arranged at a predetermined position in the running path on the side of the winding start side of the magnetic tape wound around the drum peripheral surface of the magnetic tape wound around a part of the magnetic tape Of the magnetic tape wound around a part of the drum peripheral surface, and the lower portion of the second guide pole disposed at a predetermined position in the traveling path on the end side of the winding of the drum peripheral surface. The height of the flange 7 (the position of the running path of the magnetic tape) and the opposite direction, namely,
If one is raised, the other is lowered, and so on, by correcting the heights of the first and second guide poles in directions opposite to each other. A first guide pole arranged on the running path of the magnetic tape on the winding start side on the drum peripheral surface so that the correction is performed, and a first guide pole arranged on the magnetic tape on the running path of the winding end side of the drum peripheral surface on the magnetic tape. The height of the lower flange 7 with respect to the second guide pole is controlled by a height control mechanism to which a control signal obtained on the basis of the information on the curvature of the recording trace is controlled, so that the curvature of the recording trace can be easily adjusted. And a good reproduction signal free from the influence of the above can be obtained.

The state of the envelope of the reproduced FM signal obtained from the magnetic recording / reproducing apparatus in the reproducing mode is wavy corresponding to the S-shaped curve of the recording trace. Thus, after the reproduced FM signal is detected by the amplitude detector, for example, a signal portion near the head and a signal portion near the end of the envelope signal corresponding to each one recording trace sequentially output from the amplitude detector, for example. A signal sampled from a signal portion close to the head in the envelope signal corresponding to each of the above-described sequential recording traces by performing sampling at a time position where a signal portion and an intermediate signal portion can be extracted. For changing the height of the lower flange 7 of the first guide pole disposed in the traveling path on the winding start side on the drum peripheral surface, based on the signal extracted from the intermediate signal portion. A height control signal having a height and a direction is generated and supplied to the motor M of the height control mechanism of the lower flange 7 of the first guide pole.

Also, based on the signal sampled from the signal portion near the end and the signal extracted from the intermediate signal portion in the envelope signal corresponding to each of the recording traces in sequence, the drum peripheral surface is determined. A height control signal having a magnitude and a direction for changing the height of the lower flange 7 of the second guide pole arranged in the traveling path on the end side of the winding is generated, and the control signal is generated. The second guide pole is supplied to the motor M of the height control mechanism of the lower flange 7 of the guide pole. The magnitude of the signal sampled from the intermediate signal portion of the envelope signal corresponding to the reproduced FM signal reproduced from one recording trace changes the height of the first and second guide poles. It does not change much. The information on the change in height can be easily obtained by comparing successive sample values on the time axis at the same position in the reproduced FM signal and the corresponding envelope signal reproduced from each one recording trace in sequence. . The height control signal can be generated by a control device including a microprocessor.

The different heights for changing the height of the lower flange 7 of the first and second guide poles to which the drive signal corresponding to the height control signal generated as described above is supplied. The motor M in the control mechanism of the above (1) is controlled by the drive signal corresponding to the height control signal having the magnitude and direction individually supplied thereto in the forward (or reverse) direction according to the signal, and Rotate by the appropriate amount.
The rotational force of the motor M is the gear 1 fixed to the rotating shaft 9.
0, a gear 1 functioning as a second rotating power transmission member
1 to rotate the gear 11 in the forward (or reverse) direction. The notch 13 provided in the gear 11 functioning as the second power transmission member is engaged with the projection 3 functioning as the first power transmission member.
The gear 11 functioning as the second power transmission member described above.
Body 3 whose rotation functions as a first rotation power transmission member
, The shaft 1 of the guide pole GP to which the projection 3 is fixed is rotated in the direction of arrow R in FIG.

A screw 4a formed on the outer periphery of a cylindrical portion 4 provided below the base of the projection 3 fitted and fixed to the shaft 1 of the guide pole GP.
Is screwed into the female screw 5 provided on the pole base PB, so that the protrusion 3 functioning as the first rotational power transmitting member rotates the gear 11 functioning as the second rotational power transmitting member. By being rotated by each operation, the shaft 1 of the guide pole is displaced in the direction of the center line of the shaft 1 of the guide pole. Therefore, the position of the lower flange 7 fixed to the shaft 1 of the guide pole is The projection 3 is displaced in the direction of the arrow Y in FIG. 2B in accordance with the amount of rotation of the projection 3 functioning as the first power transmission member.

In the magnetic recording / reproducing apparatus of the present invention which has been described with reference to FIGS. 1 and 2, the projection 3 functioning as the first rotating power transmission member is gradually formed from the base to the tip in a planar shape. It is a plate member having a narrow width, and the projection 3 is engaged with the notch 13 provided in the gear 11 functioning as the second rotational power transmitting member, so that the second rotational power transmitting member Since the mechanism having the configuration in which the rotating power is transmitted to the first rotating power transmission member is used, the pole base PB is moved from the position of the cassette of the magnetic tape to the position of the drum assembly DA during the operation of the loading mechanism. Move along the predetermined movement path, and
Position of the protrusion 3 functioning as the first power transmission member when the tip portion 14 of B is positioned by engaging with the base catcher BC provided corresponding to the pole base PB. Even if the position of the notch 13 in the gear 11 functioning as the second rotational power transmitting member is slightly deviated for some reason, the projection 3 functioning as the first rotational power transmitting member is It smoothly enters into the notch 13 of the gear 11 functioning as the second power transmission member, and the tip 14 of the pole base PB
Is engaged with a base catcher BC provided in correspondence with the pole base PB, and when the positioning is completed, the projection 3 functioning as the first power transmission member described above; There is an advantage that the notch 13 in the gear 11 functioning as the rotating power transmission member is properly engaged.

However, as described above, the transmission of the rotational power is achieved by the engagement between the projection 3 functioning as the first rotational power transmitting member and the notch 13 of the gear 11 functioning as the second rotational power transmitting member. In this case, since a large amount of rotation cannot be transmitted, a projection functioning as a first rotating power transmitting member that rotates by rotating the gear 11 functioning as a second rotating power transmitting member. If it is desired to increase the amount of displacement of the guide pole in the vertical direction even with a small amount of rotation of the body 3, it is necessary to use a screw 4 having a large pitch as a screw 4. It may be difficult to increase the positional accuracy of the flange 7.

In the magnetic recording / reproducing apparatus of the present invention shown in FIG. 3, a gear 17 is used as the first rotating power transmitting member, and the gear 17 and the gear 1 functioning as the second rotating power transmitting member are used.
2, and a configuration example in which a mechanism having a configuration in which the rotational power is transmitted from the second rotational power transmission member to the first rotational power transmission member is used. In the magnetic recording / reproducing apparatus shown in FIG. 3, GP is a guide pole, SP is a tilt pole, and a pole base P shown in FIG.
FIG. 4B shows the relationship between the guide pole GP, the inclined pole SP, and the magnetic tape T. FIG. 4B is a longitudinal sectional view of the guide pole GP. It is shown. Reference numeral 1 denotes a guide pole shaft. The guide pole shaft 1 is inserted into a hole 2 formed in the pole base PB near the lowermost end thereof. The moving direction of the shaft 1 is guided.

The shaft 1 of the guide pole is fitted and fixed to a gear 17 functioning as a first rotating power transmitting member, and has a cylindrical portion 18 provided below the base of the gear 17 described above. Is provided with a screw 18a. The screw 18a formed on the cylindrical portion 18
Is screwed into a female screw 5 provided on the pole base PB. Since the length of the female screw 5 is set to be longer than the screw 18a formed in the cylindrical portion 18, the guide pole shaft 1 is rotated to rotate the guide pole shaft 1. It can be displaced in the direction of the center line. The gear 17 functioning as the first rotating power transmission member shown in FIG. 4 has a screw 18a formed on the outer periphery of a cylindrical portion 18 provided below the base thereof. A screw to be screwed into the female screw 5 provided on the base PB may be provided on the outer peripheral portion of the shaft 1 of the guide pole.

Reference numerals 6 and 7 denote upper and lower flanges fixed to the guide pole shaft 1, and 8 denotes a magnetic tape T.
Is a roller having a length equal to the width of the roller. M is a motor, and a pulse motor is used as the motor M, for example. A gear 10 is fixed to the rotating shaft 9 of the motor M, and a gear 16 functioning as a second power transmission member is meshed with the gear 10. Reference numeral 12 denotes a rotation shaft of the gear 16 functioning as the above-described second power transmission member. The gear 16 functioning as the second rotational power transmitting member can transmit the rotational power by meshing with the gear 17 functioning as the first rotational power transmitting member.

The operation of the loading mechanism (not shown) causes the pole base PB to move along the predetermined movement path from the position of the magnetic tape cassette to the position of the drum structure DA, and the loading operation of the magnetic tape by the loading mechanism is performed. In the completed state, when the distal end portion 14 of the pole base PB is positioned by engaging with the base catcher BC provided corresponding to the pole base PB, the first turning power transmission member is used. The functioning gear 17 is gradually meshed with the gear 16 functioning as a second rotational power transmission member, and the tip end portion 14 of the pole base PB has a base catcher BC provided corresponding to the pole base PB. In the state where the engagement and positioning are completed, the first rotation power transmission member is used as the above-described first rotation power transmission member. A gear 17 that ability, the gear 16 which serves as a second turning force transmitting member, is in the state of being combined properly meshed. In this state, the height of the lower flange 7 of the guide pole determined by the rotation position of the gear 17 functioning as the first rotation power transmission member is set to a regular height determined for the magnetic recording apparatus. I will decide.

As described above, the tip 1 of the pole base PB
4 completes the loading operation of the magnetic tape by the loading mechanism which is positioned by engaging with the base catcher BC provided corresponding to the pole base PB, and functions as the first power transmission member described above. The above-described first gear in a state where the gear 17 that rotates and the gear 16 that functions as the second rotational power transmission member are correctly meshed.
The height of the lower flange 7 of the guide pole, which is determined by the rotation position of the gear 17 functioning as the rotation power transmitting member, is the winding start side of the magnetic tape wound around a part of the drum peripheral surface on the drum peripheral surface. And a lower flange 7 of the first guide pole arranged at a predetermined position on the traveling path of the drum, and a lower end of the magnetic tape wound around a part of the drum peripheral surface on the drum peripheral surface. If each of the second guide pole and the lower flange 7 of the second guide pole arranged at a predetermined position in the traveling path are set to the regular height determined for the magnetic recording device, in this state, If the magnetic recording apparatus is operated in the recording mode, a recorded magnetic tape having a standard recording trace pattern can be obtained.

In the magnetic recording / reproducing apparatus shown in FIG. 3 as well, after the reproduced FM signal is detected by the amplitude detector in the reproducing mode, for example, one recording trace is sequentially output from the amplitude detector. For the corresponding envelope signal, sampling is performed at a time position such that a signal portion near the head, a signal portion near the end, and an intermediate signal portion can be extracted. Based on a signal sampled from a signal portion close to the head and a signal extracted from an intermediate signal portion in a corresponding envelope signal, a first one arranged in a running path on the winding start side around the drum peripheral surface. A height control signal having a size and a direction for changing the height of the lower flange 7 of the guide pole of the first guide pole, and transmitting the control signal to the height control mechanism of the lower flange 7 of the first guide pole. Supplied to the motor M. Further, based on the signal sampled from the signal portion near the end of the envelope signal corresponding to each of the recording traces in sequence and the signal extracted from the intermediate signal portion, the winding around the drum peripheral surface is performed. A height control signal having a magnitude and a direction for changing the height of the lower flange 7 of the second guide pole disposed in the end traveling path is generated, and is transmitted to the second guide pole. It is supplied to the motor M of the height control mechanism of the lower flange 7 of the pole.

Accordingly, the motors M in the control mechanisms of different heights for changing the heights of the lower flanges 7 of the first and second guide poles have different sizes and directions supplied individually. By a drive signal corresponding to a control signal having a height having a forward rotation (or a reverse rotation) according to the aforementioned signal.
In a direction corresponding to the signal, the rotational force of the motor M is applied to the gear 10 fixed to the rotating shaft 9.
Gear 16 functioning as a second power transmission member via
Conveyed to. When the gear 16 rotates in the forward (or reverse) direction, the gear 17 functioning as a first power transmission member engaged with the gear 16 functioning as a second power transmission member rotates. Thereby, the shaft 1 of the guide pole GP to which the gear 17 functioning as the first power transmission member is fixed is rotated in the direction of arrow R in FIG. Shaft 1 of the guide pole GP
The screw 1 formed on the outer periphery of the cylindrical portion 4 provided below the base of the gear 17 fitted and fixed to the
8a is screwed into the female screw 5 provided on the pole base PB, so that the gear 17 functioning as the first rotating power transmitting member rotates the gear 11 functioning as the second rotating power transmitting member. By being rotated by each operation, the shaft 1 of the guide pole is displaced in the direction of the center line of the shaft 1 of the guide pole. Therefore, the position of the lower flange 7 fixed to the shaft 1 of the guide pole is
The gear 17 functioning as the above-mentioned first rotation power transmission member
Is displaced in the direction of arrow Y in FIG.

In the magnetic recording and reproducing apparatus of the present invention described above with reference to FIGS. 1 to 4, the control of the position of the lower flange 7 fixed to the shaft 1 of the guide pole is performed by the control device. , It is difficult to control the position of the lower flange 7 fixed to the guide pole shaft 1 with high accuracy. FIGS. 5 to 8 show examples of the configuration of the magnetic recording / reproducing apparatus of the present invention shown in FIGS. 1 and 3 in which the above-mentioned problem does not occur. The configuration example of the magnetic recording / reproducing apparatus shown in each of FIGS. 5 and 6 is a configuration in which a reference position detecting unit and a rotary encoder are added to the magnetic recording / reproducing apparatus described with reference to FIG. The configuration example of the magnetic recording / reproducing apparatus shown in FIGS. 7 and 8 is different from the magnetic recording / reproducing apparatus described with reference to FIG. A magnetic recording / reproducing apparatus having a configuration in which means and a rotary encoder are added.

5 to 8, reference symbol RE denotes a rotary encoder, which has a function of generating and outputting a pulse having information on the rotation direction and the amount of rotation of the rotating shaft of the motor. A rotary encoder having an appropriate configuration can be selected and used from among known rotary encoders having various configurations. Further, PH in each figure is a position sensor used as a detecting means of a reference position. As the position sensor PH, for example, in a light path between a light emitting element and a light receiving element which are arranged to face each other. In addition, a photo interrupter having a configuration in which the light shielding plate SPP can be moved can be used. In the magnetic recording / reproducing apparatus shown in FIGS. 5 and 7, the light shielding plate SPP fixed to the rotating shaft 9 of the motor M is rotated by the position sensor P fixed to the drum base DB when the motor M rotates.
H is configured to be movable in an optical path between a light emitting element and a light receiving element which are arranged to face each other.

In the magnetic recording / reproducing apparatus shown in FIG. 5, the light shielding plate SPP in the position sensor PH is used.
Is positioned out of the optical path between the light emitting element and the light receiving element disposed opposite to each other, and the position at which the light of the light emitting element is received by the light receiving element is defined as a reference position for the light shielding plate SPP. When the light-shielding plate SPP is in the reference rotation phase, the notch 13 in the gear 11 functioning as the second rotation power transmission member engaged with the gear 10 when the light shielding plate SPP is in the reference rotation phase is correctly engaged. The rotation phase of the projection 3 functioning as the first rotation power transmission member in the state in which the rotation is performed is defined as its reference rotation phase, and the rotation phase of the projection 3 functioning as the first rotation power transmission member is determined. The position of the lower flange 7 fixed to the shaft 1 of the guide pole when in the above-described reference rotation phase is set to the regular height determined for the magnetic recording / reproducing apparatus.

In the magnetic recording / reproducing apparatus shown in FIG. 7, the light shielding plate SPP in the position sensor PH is used.
Is positioned out of the optical path between the light emitting element and the light receiving element disposed opposite to each other, and the position at which the light of the light emitting element is received by the light receiving element is defined as a reference position for the light shielding plate SPP. When the light-shielding plate SPP is in the reference rotation phase, the first rotation power transmission member is engaged with the gear 16 functioning as the second rotation power transmission member. The rotation phase of the gear 17 functioning as the first power transmission member is defined as the rotation phase of the gear 17 in a state where the gear 17 functioning as the first gear is properly meshed with the rotation phase of the gear 17 serving as the reference rotation phase. However, the position of the lower flange 7 fixed to the shaft 1 of the guide pole when in the above-described reference rotation phase is set to the regular height determined for the magnetic recording / reproducing apparatus.

In the magnetic recording / reproducing apparatus shown in FIGS. 6 and 8, the light shielding plate SPP fixed to the shaft 1 of the guide pole GP rotates the guide integrally with the first power transmission member. When the shaft 1 of the pole GP rotates, the pole GP is configured to be movable in an optical path between a light emitting element and a light receiving element which are arranged opposite to each other in the position sensor PH fixed to the pole base PB. In the magnetic recording / reproducing apparatus shown in FIG.
The light-shielding plate SPP is moved out of the optical path between the light-emitting element and the light-receiving element disposed opposite to each other, and the position at which the light of the light-emitting element is received by the light-receiving element is referred to as the light-shielding plate SPP And the rotation phase of the projection 3 functioning as the first rotation power transmission member when the light shielding plate SPP is in the reference rotation phase is defined as the reference rotation phase. The position of the lower flange 7 fixed to the shaft 1 of the guide pole when the rotation phase of the projection 3 functioning as the first rotation power transmission member is at the reference rotation phase is as described above. The height is set to a regular height determined for the magnetic recording / reproducing apparatus.

In the magnetic recording / reproducing apparatus shown in FIG. 7, the light shielding plate SPP in the position sensor PH is used.
Is positioned out of the optical path between the light emitting element and the light receiving element disposed opposite to each other, and the position at which the light of the light emitting element is received by the light receiving element is defined as a reference position for the light shielding plate SPP. The rotation phase of the gear 17 functioning as the first rotation power transmission member when the light shielding plate SPP is in the reference rotation phase is defined as the reference rotation phase.
The gear 17 functioning as the above-mentioned first rotation power transmission member
The position of the lower flange 7 fixed to the shaft 1 of the guide pole when the rotation phase of the rotation phase is the above-mentioned reference rotation phase is the normal height determined for the magnetic recording / reproducing apparatus. It is to be.

In the magnetic recording / reproducing apparatus shown in FIGS. 5 to 8, a signal corresponding to the reference phase of the first power transmission member obtained from the position sensor PH and the signal output from the rotary encoder RE are output. A pulse having information on the direction of rotation of the rotating shaft of the motor and information on the amount of rotation is supplied to the control device, and the first and
A control signal for the height of the second guide pole can be generated, which can drive the motor M of the height control device, so that the lower and upper guide poles fixed to the shaft 1 of the first and second guide poles can be driven. It is easy to set the height of each of the flanges 7 with high accuracy. That is, the height of the lower flange 7 fixed to the shaft 1 of the guide pole is determined based on the height when the rotation phase of the first power transmission member is at the reference rotation phase. By knowing the amount of rotation of the first turning power transmission member from the reference position corresponding to the reference height thus set, the first rotation power transmission member can be obtained.
The reference position of the first power transmission member is known from the output signal from the position sensor PH, and the amount of rotation of the first power transmission member from the reference position is known from the number of output pulses of the rotary encoder. Therefore, the height of the lower flange 7 fixed to the shaft 1 of the first and second guide poles is determined by a position sensor output signal output when the lower flange 7 is at a reference height. A counter preset to a numerical value is detected by counting the number of pulses output from a rotary encoder RE provided on a motor M used to rotate the first power transmission member. Because you can.

The magnetic recording / reproducing apparatus of the present invention described above with reference to FIGS. 1 to 8 controls the position of the lower flange 7 fixed to the shaft 1 of the guide pole. And a first rotating power transmitting member provided on the pole base PB side and a second rotating power transmitting member provided on the drum base DB side. Next, the magnetic recording and reproducing apparatus of the present invention shown in FIGS. 9 and 12 has a hole provided in a pole base PB provided in a loading mechanism as a height control mechanism of first and second guide poles. A configuration in which the other end of a piezoelectric bimorph plate having one end fixed to a guide pole slidably inserted therein through an insulator member is fixed to a pole base PB is used. Recording when configured An example of the configuration of raw device. In the magnetic recording / reproducing apparatus shown in FIGS. 9 and 12, the magnetic recording / reproducing apparatus is attached to a loading mechanism (not shown in FIGS. 10, 11, and 13; a part indicated by reference numeral 24 is a part of the loading mechanism). The inclined pole SP is fixed to the pole base PB.

A hole 20 (see FIGS. 10 and 13) formed in the pole base PB is movably provided with a guide pole GP.
Of the guide pole is guided by the hole 20. Upper and lower flanges are fixed to the shaft 1 of the guide pole GP, and the upper and lower flanges 6,
7, a magnetic tape T is attached to the shaft 1 of the guide pole.
A roller 8 having a length equal to the width of the roller 8 is rotatably inserted. A connecting member 21 made of an insulator is fixed to the shaft 1 of the guide pole below the portion where the lower flange 7 is fixed, and the connecting member 21 made of the insulating material and the end of the pole base PB. Projection 19 provided on
, The ends of the piezoelectric bimorph plate 22 are respectively fixed. Reference numeral 23 denotes a flexible connection line used to supply a drive voltage to the piezoelectric bimorph plate 22 described above. 9, 10, 12, and 13, between the coupling member 21 made of an insulator fixed to the shaft 1 of the guide pole and the protrusion 19 provided at the end of the pole base PB. In addition, one piezoelectric bimorph plate 22
Is shown, but a coupling member 21 made of an insulator fixed to the shaft 1 of the guide pole,
As shown in FIG. 11, between the projections 19 provided at the end of the pole base PB, a configuration in which a plurality of piezoelectric bimorph plates 22 are fixed at intervals is used. You may.

In the magnetic recording / reproducing apparatus shown in FIG. 9, the operation of a loading mechanism (not shown) causes the pole base PB to move along the predetermined moving path from the position of the magnetic tape cassette to the position of the drum structure DA. The pole base PB is moved, and the pole base PB is positioned by the engagement between the tip end portion 14 of the pole base PB and the base catcher BC provided corresponding to the pole base PB, and the magnetic tape is loaded by the loading mechanism. After the operation is completed, in the operation in various operation modes performed by the magnetic recording / reproducing apparatus, the height of the lower flange 7 of the guide pole GP is set to a required height according to each operation mode. For example, when the magnetic recording / reproducing apparatus operates in the recording mode, the height of the lower flange 7 of the guide pole GP has a size and a polarity so as to be a regular height determined for the magnetic recording apparatus. The driving voltage is supplied to the piezoelectric bimorph plate 22 via a flexible connection line 23. If the magnetic recording apparatus is operated in the recording mode in this state, a recorded magnetic tape having a standard recording trace pattern can be obtained.

When the magnetic recording / reproducing apparatus shown in FIG. 9 operates in the reproducing mode, the reproduced FM signal is detected by the amplitude detector and then output from the amplitude detector. With respect to the envelope signal corresponding to each one recording trace in sequence, sampling is performed at a time position such that a signal portion near the head, a signal portion near the end, and an intermediate signal portion can be extracted. Each one
Based on the signal sampled from the signal part near the head and the signal extracted from the intermediate signal part of the envelope signal corresponding to the record mark of the book, it is arranged on the running path on the winding start side on the drum peripheral surface based on the signal extracted from the intermediate signal part A control signal (drive voltage) having a height and a size for changing the height of the lower flange 7 of the first guide pole is generated, and the control signal (drive voltage) is connected to a flexible connection line 23. Via the piezoelectric bimorph plate 2 of the height control mechanism of the lower flange 7 of the first guide pole
Feed to 2. Further, based on the signal sampled from the signal portion near the end of the envelope signal corresponding to each of the recording traces in sequence and the signal extracted from the intermediate signal portion, the winding around the drum peripheral surface is performed. Lower flange 7 of the second guide pole arranged in the end traveling path
A control signal (drive voltage) of a height having a magnitude and a direction for changing the height of the second guide pole via a flexible connection line 23 is generated. To the piezoelectric bimorph plate 22 of the height control mechanism.

As described above, the flexible connection line 23 is used.
When a driving voltage is applied to the piezoelectric bimorph plate 22 through the piezoelectric actuator, the piezoelectric bimorph plate 22 is displaced by the driving voltage applied thereto, and the displacement is changed via the coupling member 21 made of an insulator. Is displaced. Therefore, the heights of the first and second guide poles are respectively changed as required according to the displacement of the piezoelectric bimorph plate 22, and the height of the magnetic tape is adjusted so that the recording trace of the magnetic tape matches the rotation locus of the rotary magnetic head. The position of the tape path can be changed. FIGS. 10A to 10C show a piezoelectric bimorph plate 22 via a connection line 23 having flexibility.
Of the guide pole GP due to the displacement of the piezoelectric bimorph plate 22 when a driving voltage is applied to the shaft 1
FIG. 11 is a diagram showing a change state of the height of the lower flange 7, and an arrow Y in FIGS. 10A and 10C is a moving direction of the shaft 1 of the guide pole GP. FIG. 10B shows that the driving voltage having a magnitude and a polarity such that the height of the lower flange 7 of the guide pole GP becomes a regular height determined for the magnetic recording device is applied to the piezoelectric bimorph plate 22. The state given is shown.

In the magnetic recording / reproducing apparatus of the present invention shown in FIG. 9, since the position of the lower flange 7 fixed to the shaft 1 of the guide pole is controlled by open control by the control device, Although it is difficult to control the position of the lower flange 7 fixed to the guide pole shaft 1 with high accuracy, the magnetic recording / reproducing apparatus of the present invention shown in FIG. An example of the configuration of a magnetic recording / reproducing apparatus in which the position sensor 26 is added to the recording / reproducing apparatus so that the above-described problem does not occur is shown. In FIGS. 12 and 13, reference numeral 25 denotes a light-shielding plate attached to a coupling member 21 made of an insulator fixed to the shaft 1 of the guide pole, and reference numeral 26 denotes a position sensor used as a reference position detecting means. is there.

As the position sensor 26, for example, a photo interrupter having a configuration in which the light shielding plate 25 can be moved in an optical path between a light emitting element and a light receiving element arranged opposite to each other may be used. it can. (A) of FIG.
14 (c) are front views {FIG. 14 (a)}, side sectional views {FIG. 14 (b)}, and top views {FIG. (C)} is shown, and in FIG. 14, 27 is a light emitting element,
Numerals 28 and 29 are light receiving elements for receiving the light emitted from the light emitting element 27 described above. In FIG. 14, the light receiving element 2
The magnitude of the output signal from the light-receiving element 8 changes according to the amount of displacement of the light-shielding plate 25 that moves in and out of the optical path between the light-emitting element 27 and the light-receiving element 28, and is displaced. The light from the light emitting element 27 is incident irrespective of the displacement amount of the plate 25, and the influence of the drift due to the temperature change in the light receiving elements 28 and 29 is obtained by using the output signal from the light receiving element 29. Can be removed (see JP-A-5-81630).

The light shielding plate 2 in the position sensor 26 described above
The position at which the light from the light emitting element is received by the light receiving element is removed from the optical path between the light emitting element and the light receiving element disposed opposite to each other. The position, that is, the position of the lower flange 7 fixed to the shaft 1 of the guide pole is set to a regular height defined for the magnetic recording / reproducing apparatus.
In the magnetic recording / reproducing apparatus shown in FIG. 12, the position signal obtained from the position sensor PH is supplied to the control device, and the control device controls the height of the first and second guide poles. Since the signal can be generated and the piezoelectric bimorph plate 22 of the height control device can be operated, the height of the lower flange 7 fixed to the shaft 1 of the first and second guide poles can be respectively adjusted. It is easy to set with high accuracy.

[0051]

As is apparent from the above description, the magnetic recording / reproducing apparatus of the present invention is arranged such that the position of the rotation locus plane occupies a predetermined position with respect to the fixed portion of the body of the magnetic recording / reproducing apparatus. When recording a signal on a magnetic tape wound around a part of the drum peripheral surface or reproducing a recorded signal by a rotating magnetic head that is driven and rotated, The magnetic tape traveling path on the drum peripheral surface of the magnetic tape wound around a part of the drum peripheral surface is located in the magnetic tape traveling path on the magnetic tape winding start side on the drum peripheral surface. The height of the first guide pole and the height of the second guide pole disposed in the running path of the magnetic tape at the end of winding of the drum peripheral surface are obtained based on the reproduction signal from the magnetic tape. First guide Of the recording track at a position close to the second guide pole and a height control signal generated using the bending information of the recording track at a position close to the second guide pole. The height of the first and second guide poles used when changing the running path of the magnetic tape wound around a part to match the recording trace of the magnetic tape with the rotation locus of the rotary magnetic head. As a height control mechanism for changing the height, a first rotating power transmission is performed on a shaft of a guide pole provided with a screw portion screwed into a screw hole screwed into a pole base provided in the loading mechanism. The second rotating power transmission member coupled to the first rotating power transmitting member in a state where the loading operation is completed is provided on the fixed portion side of the body while the members are fixed. Things, also, the first
Each of the rotation power transmission member and the second rotation power transmission member is provided with each detection means for the reference position, and the reference position signal obtained from the reference position detection means and the second rotation power transmission member are driven. Since the height of each of the first and second guide poles can be set with high precision by using the output signal from the rotary encoder attached to the motor, the magnetic recording / reproducing apparatus of the present invention is simple. With the device having the simple configuration, it is easy to control the displacement amount of the magnetic tape traveling path large and to control it precisely. According to the present invention, the above-mentioned conventional problems can be solved well. can do.

[Brief description of the drawings]

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

FIG. 2 is a diagram showing details of some components of the magnetic recording / reproducing apparatus of the present invention.

FIG. 3 is a perspective view of a magnetic recording / reproducing apparatus of the present invention having a different configuration.

FIG. 4 is a diagram showing details of some components of the magnetic recording / reproducing apparatus of the present invention.

FIG. 5 is a perspective view of a magnetic recording / reproducing apparatus of the present invention having a different configuration.

FIG. 6 is a perspective view of a magnetic recording / reproducing apparatus of the present invention having a different configuration.

FIG. 7 is a perspective view of a magnetic recording / reproducing apparatus of the present invention having a different configuration.

FIG. 8 is a perspective view of a magnetic recording / reproducing apparatus of the present invention having a different configuration.

FIG. 9 is a perspective view of a magnetic recording / reproducing device of the present invention having a different configuration.

FIG. 10 is a diagram showing details of some components of the magnetic recording / reproducing apparatus of the present invention.

FIG. 11 is a diagram showing details of some components of the magnetic recording / reproducing apparatus of the present invention.

FIG. 12 is a perspective view of a magnetic recording / reproducing device of the present invention having a different configuration.

FIG. 13 is a diagram showing details of a part of a magnetic recording / reproducing apparatus of the present invention.

FIG. 14 is a diagram showing details of some components of the magnetic recording / reproducing apparatus of the present invention.

[Explanation of symbols]

DB: drum base, Dd: lower drum, Du: upper drum, H: rotary magnetic head, BC: base catcher,
DA: drum structure, PB: pole base, M: motor,
GP: Guide pole, SP: Inclined pole, T: Magnetic tape, RE: Rotary encoder, PH, 26: Position sensor, SPP, 25: Light shield plate, 1: Guide pole shaft, 3: Projecting body, 4: Cylindrical part 5, Pole base PB
Female screw provided at 6; upper flange fixed to guide pole shaft 1; 7: guide pole shaft 1
, A roller, 9 ... a rotating shaft of a motor M, 10, 12, 16, 17 ... a gear, 13 ...
Notch, 14 ... Pole base PB tip, 18 ... Cylinder, 19 ... Protrusion provided at end of pole base PB, 21 ... Insulating coupling member, 22 ... Piezo bimorph plate, 23 ... Possible Flexible connection line, 27 light emitting element, 2
8, 29 ... light receiving element,

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-4-283456 (JP, A) JP-A-4-167256 (JP, A) JP-A-3-252957 (JP, A) JP-A-2- 71452 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) G11B 15/60 G11B 15/61 G11B 15/665

Claims (2)

(57) [Claims] 1. A magnetic head comprising: a drum which rotates integrally with a rotary magnetic head while winding a magnetic tape around a part of a peripheral surface; and a first guide pole having a flange for regulating a height direction of the magnetic tape. The magnetic tape is pulled out of the cassette and wound on the peripheral surface of the drum by supporting the tape so as to be movable in the height direction of the tape, and supporting the first inclined pole paired with the first guide pole. A first pole base that moves to the start side, and a second guide pole that has a flange that regulates the height direction of the magnetic tape, is movably supported in the height direction of the magnetic tape, and A second pole base that supports a second inclined pole paired with the second guide pole, pulls out the magnetic tape from the cassette, and moves toward the end of winding on the peripheral surface of the drum; Rohde The magnetic tape was wound around a part of the peripheral surface of the drum by the first guide pole and the first inclined pole and the second guide pole and the second inclined pole at the completion of the At this time, the height of each flange of the first and second guide poles is set to a regular height in the recording mode, and the first guide obtained based on the reproduction signal from the magnetic tape in the reproduction mode. The first and second guide poles are generated by each of the height control signals generated using the bending information of the recording trace at a position near the pole and the bending information of the recording trace at a position near the second guide pole. And a height control mechanism of first and second guide poles for controlling the height of each of the flanges so that the recording trace of the magnetic tape matches the rotation trajectory of the rotary magnetic head. Second guide The height control mechanism of the first and second guide poles is configured to screw the respective screw portions of the respective first power transmission members fixed to the respective shafts of the first and second guide poles on the first and second pole bases. Each of the second rotational power transmission members coupled with the first rotational power transmission members in a state where the loading operation is completed is screwed into each of the screw holes thus formed, and each of the second rotational power transmission members is driven toward the fixed portion side of the apparatus by driving each motor. The first and second rotational power transmitting members are rotated by the respective height control signals, and the first and second rotational power transmitting members are rotated by the respective height control signals. A magnetic recording / reproducing apparatus, wherein the height of each flange of the guide pole is controlled in the height direction of the magnetic tape. 2. The magnetic recording / reproducing apparatus according to claim 1, wherein each of the first rotational power transmitting member or the second rotational power transmitting member is provided with a detecting means for a reference position. A magnetic recording / reproducing apparatus, wherein each motor is provided with each rotary encoder.