JPS629564Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention uses a sheet-like recording medium such as a magnetic sheet, the sheet-like recording medium is mounted in an arc shape around a rotating head, and the sheet-like recording medium and the rotating head are rotated. The present invention relates to a sheet-shaped recording medium mounting device in a recording/reproducing apparatus configured to perform recording or reproduction by moving the head relatively in the direction of the rotation axis.

As is well known, in this type of recording and reproducing apparatus, the recording and reproducing characteristics are greatly influenced by the contact state of the rotary head with the sheet-shaped recording medium, ie, the quality of the so-called head touch.

By the way, conventionally, an elastic layer such as rubber is pasted on the inner surface of the opening/closing lid that presses the sheet-shaped recording medium in an arc shape around the rotating head, and this elastic layer allows the sheet-shaped recording medium to be held in the rotating head. It had a structure that allowed it to be pressed elastically. However, with this structure, it is difficult to achieve highly accurate roundness of the elastic layer. Next, the rotating head bites into the elastic layer and comes into contact with the sheet-like recording medium.
The load (resistance) at the time of contact is extremely large. Therefore, it is difficult for the rotating head to uniformly contact the entire surface of the sheet-shaped recording medium, and the contact of the rotating head causes rapid partial deformation of the sheet-shaped recording medium, making it easy to damage the sheet-shaped recording medium. The sheet-shaped recording medium had defects such as misalignment, resulting in poor recording and reproduction characteristics.

Conventionally, an arc-shaped sheet receiving guide is arranged on the outside of the sheet-like recording medium facing the rotating head, and an arc-shaped groove is provided on the inner surface of the sheet-receiving guide. There is one in which a part of the groove is pushed into the groove to make contact with the groove. However, in this case as well, there were defects such as sudden partial deformation of the sheet-like recording medium due to contact with the rotary head, which easily caused damage to the sheet-like recording medium or caused misalignment of the sheet-like recording medium.

The present invention has been devised to correct the above-mentioned defects, and is intended to provide a recording/reproducing apparatus with very good head touch.

Embodiments of a magnetic sheet recording/reproducing apparatus to which the present invention is applied will be described below with reference to the drawings.

First, the structure of the recording/reproducing device is shown in Figures 1 to 10.
To explain with reference to the drawings, a main body 2 is mounted on a base 1. As shown in FIG. The main body 2 has a generally semi-cylindrical shape, is hollow inside, and has an opening 3 at the top. The main body 2 is composed of a front wall 4, a rear wall 5, and left and right side walls 6, 7. On the inner surface portions of both the left and right side walls 6 and 7, a substantially semi-circular arc curved upward protrusion extends between the upper end surface 4a of the front wall 4 and the upper end surface 5a of the rear wall 5. A pair of arc-shaped reference surfaces 8a and 8b are provided. Note that both arc-shaped reference surfaces 8a, 8b are formed with vertically rising width regulating surfaces 9a, 9b on both sides.

The main body 2 is provided with an opening/closing lid 10 for opening and closing the opening 3. The opening/closing lid 10 has a substantially semi-cylindrical shape and is inserted between the left and right side walls 6, 7 of the main body 2. Both ends of the fulcrum shaft 11 inserted into one end of the opening/closing lid 10 in the longitudinal direction (in a direction parallel to the axis of the cylinder) are attached to the back wall 5.
It is attached to the left and right side walls 6, 7 at a horizontal position near the upper end, and the opening/closing lid 10 can be moved around its fulcrum shaft 11 into a closed state shown by a solid line in FIG. 7 and an open state shown by a chain line in FIG. It is constructed so that it can be opened and closed at a 90° angle. In the open state, the opening/closing lid 10 is supported by a lid receiving plate 12 mounted on the base 1.

As clearly shown in FIGS. 1, 7, and 8, the inner surface 10c of the opening/closing lid 10 exhibits an arcuate surface.
A flexible and elastic film 13 made of, for example, synthetic resin is attached in an arc shape with an air space 14 in between. At this time, the film 13 is secured to the opening/closing lid 1 by a pair of spacers 15 made of an elastic material, for example, at both ends 13a in the arcuate direction.
0 with adhesive or the like. Note that spacer 1
5 does not necessarily have to be an elastic body.

When the opening/closing lid 10 is in the closed state, the longitudinal direction of the film 13 (direction parallel to the axis of the cylinder)
Both arc-shaped reference surfaces 8a,
8b.

Further, a groove 16 is provided along the rear wall 5 of the main body 2, which is cut downward from the upper surface 5a. The horizontal lower end surface of this V-groove 16 is configured as a horizontal reference surface 17 parallel to the axis of the rotary head shaft, which will be described later.

Next, the rotating magnetic head device built into the main body 2 and its driving device will be explained.

First, a rotary head shaft 19 is provided at the axial center position of a virtual cylindrical surface including both the arcuate reference surfaces 8a and 8b. This rotating head shaft 19 has both ends 19
a, 19b are inserted through the left and right side walls 6, 7, and are rotatably supported by a pair of bearings 20a, 20b made of, for example, oil-less metal and attached to the both side walls 6, 7. Note that this rotating head shaft 19 is configured as a spline shaft,
A plurality of grooves 21 are provided on the circumferential surface thereof in parallel to each other in the axial direction. A rotary head plate 22 is fitted onto the rotary head shaft 19 via its boss portion 23. However, this rotating head plate 22
are engaged with the grooves 21 of the rotary head shaft 19 through steel balls 24, respectively, and the rotary head shaft 1
9 through the steel ball 24, and is configured to be able to slide in the axial direction of the rotary head shaft 19 while being rotated integrally with the rotary head shaft 19. The steel balls 24 allow the rotating head plate 22 to slide with respect to the rotating head shaft 19 with extremely low friction. A pair of rotating magnetic heads 25 are located on the outer periphery of one side of the rotating head plate 22.
a and 25b are magnetic head adjustment mechanisms 26, respectively.
They are attached at an interval of approximately 180° via the pins a and 26b. Note that both magnetic head adjustment mechanisms 26a, 2
6b is schematically illustrated with the detailed structure omitted, but these magnetic head adjustment mechanisms 26a, 26b
Adjustment of the rotation radius of both rotating magnetic heads 25a and 25b (adjustment of contact pressure with respect to the magnetic sheet);
This is used to adjust azimuth, etc.

In addition, a screw shaft 2 is located below the rotating head shaft 19.
8 is provided parallel to this. The screw shaft 28 has both ends 28a and 28b inserted through the left and right side walls 6 and 7, and is rotatably supported by a pair of bearings 29a and 29b made of oil-less metal, for example, attached to the left and right side walls 6 and 7. supported.

Note that this screw shaft 28 is configured to be able to slide in the axial direction with respect to both bearings 29a and 29b, but the movement in the axial direction is restrained by a push spring 30 and an adjustment screw 31, and normally In this state, no movement in the axial direction occurs. That is, as shown in FIG. 10, the push spring 30, which is a compression spring fitted to the other end 28b of the screw shaft 28, is fitted to the other end 28b and comes into contact with the stepped portion 32 of the screw shaft 28. The spring bearing ring 33 is compressed and interposed between the spring bearing ring 33 and the washer 34 which is in contact with the other bearing 29. The spring force of the push spring 30 urges the screw shaft 28 to slide in the left direction in FIG. On the other hand, the adjustment screws 31 are disposed on the lateral side of one end 28a of the screw shaft 28 so as to be substantially coaxial with each other. The adjustment screw 31 is supported by being inserted (screwed) into a screw hole 36 provided in a support wall 35 mounted on the base 1, and its tip surface 31a is connected to one end 28a of the screw shaft 28.
is in contact with the end surface 28c of. Note that a knob 31b is provided at the other end of this adjustment screw 31. Further, the adjustment screw 31 is configured to be held down by a holding screw 37 (see FIG. 6) screwed onto the support wall 35.

A slide plate 39 is disposed vertically between the rotary head shaft 19 and the screw shaft 28. The upper end 39a of this slide plate 39 is connected to the boss portion 23 of the rotary head plate 22 by a rotary support mechanism 40.
It is rotatably supported by. Further, a screw hole 41 is provided at the lower end 39b of this slide plate 39, and the screw shaft 28 is inserted (threaded) into this screw hole 41.

On the other hand, a recording or reproducing motor 43 is arranged on one side of the main body 2. This motor 43 is mounted on the base 1, and its motor shaft 44 and one end 19a of the rotary head shaft 19 are connected to an intermediate shaft 45, pulleys 46a, 46b, and belt 4.
7. They are interlocked via a belt transmission mechanism consisting of pulleys 48a, 48b and a belt 49. The intermediate shaft 45 is supported between a pair of support plates 50a and 50b mounted on the base 1, and the pulleys 46b and 48b also serve as flywheels.

On the other hand, a motor 52 for fast forwarding and rewinding is arranged on the other side of the main body 2. This motor 5
2 is mounted on the base 1 by a mounting base 53, and the motor shaft 54, the other end 19b of the rotary head shaft 19, and the other end 2 of the screw shaft 28
8b is provided with a gear clutch mechanism. This gear clutch mechanism includes a gear 55 fixed to a motor shaft 54, and two other ends 19b, 28b.
It is composed of gears 56, 57 fixed to the three gears 55, 56, 57, and a slide gear 58 arranged so as to be able to engage with these three gears 55, 56, 57. The slide gear 58 is constituted by a wide gear, and is slidably supported by a guide shaft 60 fixed to a support plate 59 mounted on the base 1. Further, another guide shaft 61 parallel to the guide shaft 60 is fixed to the support plate 59, and a sliding rod 62 for slidingly operating the slide gear 58 slides on both guide shafts 60, 61. It is inserted so that it can move freely. An electromagnetic plunger 63 is mounted on the base 1, and a conversion lever 65, one end of which is interlocked with the suction rod 64, is connected to the base 1 via a fulcrum shaft 66.
It is rotatably supported on the top. The other end of the conversion lever 65 is interlocked with the sliding rod 62 via a pin 67 and a long hole 68. The conversion lever 65 is urged to rotate clockwise in FIG. 4 by a return spring 69 made of a tension spring.
This rotational bias causes the slide gear 58 to slide to the left via the sliding rod 62 as shown by the solid line in FIG. 2, and the slide gear 58 engages with the gears 56 and 57. It has been removed from gear 55.

Further, as shown in FIG. 9, a pair of sheet presser levers 71a and 7 are provided on the back side of the main body 2 at positions facing the backs of both the arcuate reference surfaces 8a and 8b.
1b is placed. Both levers 71a,
71b has a symmetrical shape bent into a substantially L-shape, and is rotatably supported on the base 1 by fulcrum shafts 73a, 73b at these horizontal parts 72a, 72b. . The upper ends of the vertical parts 74a, 74b of these levers 71a, 71b are opposed to the back surfaces of both arcuate reference surfaces 8a, 8b, and sheet presser rubbers 75a, 75b are bonded or otherwise attached to the front surfaces of the upper ends, respectively. It is attached at. Further, an electromagnetic plunger 76 is attached to the base 1, and a suction plate 78 is attached to the tip of the suction rod 77. A pin 79 fixed to the suction plate 78 is engaged with an elongated hole 80 provided at the tip of the horizontal portions 72a, 72b of both sheet presser levers 71a, 71b, respectively. Note that the suction plate 78 is moved to the fourth position by a return spring 81.
As shown in the figure, the sheet presser levers 71a and 71b are urged to rotate clockwise and counterclockwise in FIG. 4, respectively.
Then, due to the rotational force, the sheet presser rubber 75
a, 75b are spaced apart from both arcuate reference surfaces 8a, 8b.

In addition, SW ₁ is a magnetic sheet attachment detection switch, which is composed of, for example, a leaf switch.
It is provided in a notch 83 provided approximately in the center of the back wall 5 of the main body 2. Also SW ₂ ,
SW ₃ is a position detection switch for regulating the reciprocating stroke of the rotating magnetic heads 25a, 25b, and is composed of, for example, a leaf switch, and is installed near the left and right side walls 6, 7 in the main body 2. There is.

Further, 85 to 90 are push buttons attached to predetermined positions such as the front wall 4 of the main body 2, and these include, for example, a rewind button 85, a stop button 86, a play button 87, a fast forward button 88, a record button 89, and an endless play button. It is composed of buttons 90 and the like. And these push buttons 85~
The reference numeral 90 is composed of, for example, a feather touch type push button or a touch switch. The two rotating magnetic heads 25a and 25b are connected to the rotating head plate 2.
It is electrically connected to a predetermined circuit via a slip ring 91 provided on the boss portion 23 of No. 2 and a brush 92 attached to the slide plate 39 in contact with the slip ring 91.

Next, as shown in FIGS. 11 to 13, the magnetic sheet 9 is
3, this magnetic sheet 93 is made of a material with appropriate rigidity, such as a polyester film, for example.
Synthetic resin film material 94 having elasticity, softness, etc.
is used, and a magnetic film 95 is formed on one side (or both sides) of the film material 94.
The magnetic sheet 93 is constructed such that a recording track 96 having a length A is sequentially recorded over a width B along its longitudinal direction. Thus, the recording track 96 is inclined by a very small angle θ with respect to the longitudinal direction of the magnetic sheet 93. A guard band 97 is provided between each recording track 96, and the width _t1 of the recording track 96 is, for example, 0.6 mm, and the width _t2 of the guard band 97 is, for example, 0.4 mm.
The track pitch _T3 is 1mm. In addition, the magnetic sheet 93 implemented here
The size is almost the size of a postcard.

On the other hand, the feed pitch of the rotary head plate 22 is 2 mm.
The recording track 96 is configured such that the pair of rotating magnetic heads 25a and 25b alternately form one recording track 96 having the width t1 for each half-rotation operation of the rotating head plate ₂₂ in one rotation. has been done.

Next, how to use the magnetic sheet recording/reproducing apparatus described above will be explained.

First, the opening/closing lid 10 is opened as shown by the chain line in FIG. Next, one end 93a of the magnetic sheet 93 is
Insert into the V-groove 16 as shown in the figure (dashed line) and FIG. At this time, one end 93a of the magnetic sheet 93
comes into contact with the horizontal reference surface 17 to restrict the insertion depth, and one end 93a thereof is parallel to the axis of the rotary head shaft 19. Also magnetic sheet 9
Both left and right ends 93b, 93 on the one end 93a side of 3
c is brought into contact with both arcuate reference surfaces 8a and 8b, and the longitudinal position of the magnetic sheet 93 is regulated by both width regulating surfaces 9a and 9b.

When the magnetic sheet 93 is inserted, one end 93a of the magnetic sheet 93 is connected to the attachment detection switch.
Press SW ₁ to switch this to the on state. Then, the electromagnetic plunger 76 is energized, and its suction rod 77 is suctioned upward in FIG. 4 against the return spring 81. As a result, both sheet presser levers 71a and 71b are simultaneously rotated counterclockwise and clockwise in FIG. Both left and right ends of the side 93b, 93c
are simultaneously crimped onto both arcuate reference surfaces 8a and 8b.

Next, the opening/closing lid 10 is rotated counterclockwise in FIG. 7 to bring it into the closed state as shown by the solid line. At this time, the magnetic sheet 93 is pushed by the opening/closing lid 10, and the magnetic sheet 93 slides into the inside of the opening/closing lid 10 while being gradually curved against its elasticity. When the opening/closing lid 10 is completely closed as shown by the solid line in FIG. Reference planes 8a, 8b
is closely attached to the magnetic sheet 9 by the film 13.
3 is attached in an arc shape around both rotating magnetic heads 25a and 25b with a winding angle of 180 degrees or more. The film 13 is in close contact with the entire outer periphery of the magnetic sheet 93 to hold it.

At this time, one end 93a of the magnetic sheet 93 is regulated by the horizontal reference surface 17, and the one end 93a
With both left and right ends 93b, 93c of the sides pressed and fixed (locked) by a pair of sheet presser levers 71a, 71b, this magnetic sheet 93 is pressed down with the opening/closing lid 10, and both circular arc-shaped reference surfaces 8a, 8b are pressed. Since the magnetic sheet 93 is placed in close contact with the magnetic sheet 93, the magnetic sheet 93 does not cause any inconvenience such as positional deviation when it is installed, and the magnetic sheet 93 is accurately installed in the arc shape.

At this time, the magnetic sheet 93 can be sufficiently pressed by the own weight of the opening/closing lid 10, but if necessary, use a toggle spring or the like to actively press the opening/closing lid 10 in the counterclockwise direction as shown in FIG. You can.

Next, with the magnetic sheet attached, press the record button 8, for example.
Press 9. Then, the motor 43 rotates, and the rotational force of the motor shaft 44 is applied to the pulley 46a and the belt 4.
7, pulley 46b, intermediate shaft 45, pulley 48a,
The speed is decelerated and transmitted to the rotary head shaft 19 via the belt 49 and pulley 48b, and this is rotated counterclockwise in FIG. Note that both belts 47, 4
9 absorbs vibration, and both pulleys 46b, 48b
Since the rotary head shaft 19 exerts a flywheel effect, the rotary head shaft 19 is smoothly rotated at a predetermined speed.

Then, the rotary head plate 2 is rotated by the rotary head shaft 19.
Both rotating magnetic heads 25a and 25b are driven to rotate in the same direction through the magnetic head 2.

On the other hand, the rotational force of the rotating head shaft 19 is transmitted through the gear 56,
It is transmitted to the screw shaft 28 via 58 and 57, and drives the screw shaft 28 to rotate counterclockwise in FIG.

When the screw shaft 28 is rotated, the slide plate 39 is screwed to the left at a predetermined speed in FIG. sent.

As a result of the above, both rotating magnetic heads 25a and 25b are rotated around the rotating head shaft 19, and are moved along the rotating head axis 19 from the starting position shown by the one-dot chain line in FIG. is moved laterally to the left toward the stopped position. At this time, both rotating magnetic heads 25a and 25b are attached to the magnetic film 95 on the inner surface of the magnetic sheet 93 that is elastically wrapped by the film 13 of the opening/closing lid 10.
They are rotated in alternate elastic contact at a rotation angle of 180°. Then, for each half-rotation operation of the rotary head plate 22 during one rotation, the two rotary magnetic heads 25a, 25
A desired recording operation is performed by alternately recording recording tracks 96 having the length A and width _t1 on the magnetic sheet 93 one by one.

Note that when the playback button 87 is pressed, the same operation as described above is performed, but at this time, both rotating magnetic heads 25a,
The recorded tracks 96 of the magnetic sheet 93 on which the data 25b are recorded in advance are sequentially reproduced.

Also, when the fast forward button 88 is pressed, the motor 43
is not rotated, and the motor 52 is rotated forward at the same time as the electromagnetic plunger 63 is energized. Then, by energizing the electromagnetic plunger 63, the suction rod 64
is attracted to the left in FIG. 4 against the return spring 69, the conversion lever 64 is rotated counterclockwise in FIG. 4, and the sliding rod 62 is slid to the right in FIG. . Then, the slide gear 58 is slid from the solid line position to the chain line position in FIG. 2, this slide gear 58 is removed from the gear 56, and the gears 55 and
7. Then, the positive rotational force of the motor shaft 54 is transmitted to the screw shaft 28 through gears 55, 58, 57.
is transmitted at a high speed, and the screw shaft 28 is rotated counterclockwise in FIG. 5 at a high speed.

As a result of the above, both rotating heads 25a and 25b are moved laterally at high speed to the left in FIG. 8 along the rotating head axis 19 while their rotation is stopped.

Note that when the rewind button 85 is pressed, the electromagnetic plunger 63 is energized and at the same time the motor 52 is rotated in the reverse direction. For this reason, the screw shaft 28 is reversely rotated clockwise at high speed in FIG. 5, and both rotating magnetic heads are moved laterally at high speed to the right in FIG. 8 along the rotary head axis 19 with their rotation stopped. Ru.

If the stop button 86 is pressed during any operation such as recording, playback, fast forwarding, rewinding, etc., both the motors 43 and 52 are stopped, and both rotating magnetic heads 25a and 25b are stopped at that position. . If the fast-forwarding or rewinding operation is in progress, the electromagnetic plunger 63 is de-energized, and the conversion lever 65 is rotated clockwise in FIG. 4 by the return spring 69.
The slide gear 58 is moved back to the position shown in solid line in FIG.

Furthermore, when both rotating magnetic heads 25a and 25b reach the stop position during recording, playback, or fast forwarding, the position detection switch _SW2 contacts the slide plate 39 to detect the position, and the motor 43 or 52 stops. be done. Similarly, when both rotating magnetic heads 25a and 25b reach the start position during the rewinding operation, the position detection switch is activated.
The SW ₃ contacts the slide plate 39, its position is detected, and the motor 52 is stopped.

Note that if the endless playback button 90 is pressed during the playback operation, the motor 43 will continue to rotate;
When the motor 52 is not rotated, the electromagnetic plunger 63
is energized. As a result, the slide gear 58 is removed from the gear 56, the screw shaft 28 is stopped,
The lateral movement of both rotary magnetic heads 25a, 25b is stopped, and both rotary magnetic heads 25a, 25b perform only rotational operation at their stopped positions. At this time, both rotating magnetic heads 25a and 25b repeatedly reproduce one recording track 96, that is, endlessly reproduce it.

In this magnetic sheet recording and reproducing apparatus, track position adjustment can be performed extremely easily. That is, when the adjusting screw 31 is rotated and adjusted as shown in FIG. 10, the screw shaft 28 is adjusted to move in the axial direction due to the cooperative action of mutual pressing between the adjusting screw 31 and the push spring 30. As a result, the slide plate 39 screwed onto the screw shaft 28 is moved and adjusted together with the screw shaft 28, and the rotating head plate 22
The two rotary magnetic heads 25a, 25b are adjusted to move along the rotary head axis 19 via the rotary magnetic heads 25a, 25b. With this adjustment, the recording track 9 of the magnetic sheet 93
The position adjustment of both rotating magnetic heads 25a, 25b with respect to 6, that is, the track position adjustment is performed. Note that since the track pitch of the recording track 96 is 1 mm, the above track position adjustment is a so-called fine adjustment operation within this 1 mm.

When removing the magnetic sheet 93, first open the opening/closing lid 10 as shown by the chain line in FIG. Then, the magnetic sheet 93 stands up as shown by the chain line in FIG. 7 due to its own elastic restoring force. At this time, if the coefficient of friction between the magnetic sheet 93 and the film 13 is below a certain value, the magnetic sheet 93 will
It does not stay stuck to the film 13, but it surely slides out from the film 13, and can stand up smoothly as shown by the chain line in FIG.

Next, when the magnetic sheet 93 is pulled upward slightly, the attachment detection switch _SW1 is turned off. As a result, the electromagnetic plunger 76 is de-energized, the suction rod 77 and the suction plate 78 are pulled back downward in FIG. The sheet presser rubbers 75a and 75b are moved back counterclockwise to separate them from the magnetic sheet 93. After this, the magnetic sheet 93 can be pulled out upwardly from inside the V-groove 16 with great ease.

According to the magnetic sheet recording and reproducing apparatus described above, the film 13 is attached in an arcuate manner with the inner surface 10c of the opening/closing lid 10 with the air layer 14 interposed therebetween.
The magnetic sheet 93 is configured to be elastically wrapped around the magnetic sheet 93 from the outside in an arc shape. and the rotating magnetic head 25 relative to the magnetic sheet 93.
When the magnetic sheets 93a and 25b come into contact, the rotating magnetic heads 25a and 25b push up the film 13 against its elasticity, and the contact pressure of the rotating magnetic heads 25a and 25b against the magnetic sheet 93 is obtained as a reaction force. There is.

Therefore, the rotating magnetic heads 25a and 25b can uniformly contact the entire surface of the magnetic sheet 93 with a predetermined contact pressure. Further, the load (resistance) at the time of the contact is very small, and the magnetic sheet 93 curves smoothly and effortlessly at the time of the contact, so that the magnetic sheet 93 is not subjected to sudden partial deformation. Further, since the left and right ends 93b, 93c of the magnetic sheet 93 are securely pressed and fixed to the arc-shaped reference surfaces 8a, 8b by the film 13, no displacement of the magnetic sheet 93 occurs at all.

In other words, the rotating magnetic heads 25a, 25b uniformly contact the entire surface of the magnetic sheet 93, and even though the load (resistance) at the time of contact is small, the so-called head touch is extremely effective. be in good condition. As a result, the recording and reproducing characteristics of this magnetic sheet recording and reproducing apparatus are extremely high.

Further, according to the magnetic sheet recording and reproducing apparatus described above, the recording track 96 is configured to record linearly and parallelly along the width direction of the magnetic sheet 93, as shown in FIG. This is a so-called parallel recording method with equal intervals. Therefore length A
The magnetic sheet 9 covers the recording track 96 over the width B.
You can effectively record on almost the entire area of 3 without any waste,
The use effect of the magnetic sheet 93 is very good, and high-density magnetic recording is possible. Furthermore, when performing magnetic transfer on the magnetic sheet 93, a bias magnetic field can be applied linearly. Therefore, the bias magnetic field can be applied very easily, and the structure of the bias magnetic field generator can be made very simple.
Moreover, the magnetic transfer can be performed very easily.

Further, in the embodiment described above, the rotating magnetic head 25
A so-called two-head system using two rotating magnetic heads 25a and 25b is adopted, and the two rotating magnetic heads 25a and 25b alternately scan the magnetic sheet 93 mounted in a semicircular arc shape with a winding angle of 180 degrees or more. However, it is possible to change to a 3-head system, a 4-head system, etc. In the case of a 3-head system, the above-mentioned winding angle may be 120° or more, and in the case of a 4-head system, the above-mentioned winding angle may be 90° or more.

Although the opening/closing lid 10 is shown as an opaque component in the drawings, the opening/closing lid 10 may be made transparent or translucent by molding, for example, acrylic resin, and the elastic layer 1
If magnetic sheet 93 is provided only in the portion along both arcuate reference surfaces 8a and 8b, magnetic sheet 93 can be directly viewed from the outside through opening/closing lid 10 during operations such as recording and reproduction. In this case, the magnetic film 95 of the magnetic sheet 93
It is very convenient to display headings, pictures, characters, etc. on the opposite side and to be able to view these directly from the outside during recording and playback operations.

Furthermore, in the embodiments described above, a magnetic sheet and a magnetic head were used as the sheet-like recording medium and rotary head referred to in the present invention, but the present invention is not limited to these, and can be used to record or reproduce information using various methods. Various sheet-like recording media and rotating heads may be used.

In the above-mentioned embodiment, the screw shaft 28 is rotated intermittently at regular intervals by a pulse motor or the like, so that the rotating head is rotated along the rotating head shaft 1.
If the rotating head is configured to step feed the recording medium at a constant pitch along the recording head 9 and the rotating head is configured to scan the recording medium while the step feed movement of the rotating head is stopped, it is possible to record a recording track that is completely perpendicular to the longitudinal direction of the recording medium, which is convenient for performing endless playback, etc.

Further, in the above-described embodiment, the magnetic sheet 93 is fixed and the rotating magnetic heads 25a and 25b are rotated and moved in the direction of their rotational axes. However, according to the present invention, the rotating magnetic heads 25a and 25b are moved at a fixed position. While rotating, the sheet-like recording medium can also be held by a reciprocating carriage, and the sheet-like recording medium can be moved in the direction of the rotation axis by the carriage.

Furthermore, in the embodiments described above, a pair of sheet holding levers 74a and 74b driven by a driving means such as an electromagnetic plunger 76 are used as means for locking the end of the sheet-like recording medium. Although a structure is adopted in which the left and right ends 93b and 93c are held down and locked, it is also possible to provide a locking hole at the end of the magnetic sheet 93, and insert a plate spring or the like into the locking hole. A structure that locks the stop part and a V-groove 1 into which the end of the magnetic sheet 93 is inserted.
A structure in which the magnetic sheet 93 is locked using the frictional force between the inner wall surface of the magnetic sheet 93 and various other effective locking structures can be used.

As described above, the present invention wraps a sheet-shaped recording medium in an arc shape with a flexible film attached in an arc shape on the inner surface of an opening/closing lid with an air layer in between. The recording medium is configured such that both ends thereof are pressed and fixed to a pair of arc-shaped reference surfaces, and a rotary head is elastically brought into contact with a sheet-shaped recording medium held by the film to perform recording or reproduction. Since it is constructed as follows, the head touch is very good. Further, there is an advantage that recording and reproduction can be performed with extremely high precision without damaging the sheet-shaped recording medium or causing any positional shift in the sheet-shaped recording medium during recording or reproduction.

[Brief explanation of the drawing]

The drawings show an embodiment in which the present invention is applied to a magnetic sheet recording/reproducing device, in which Fig. 1 is a perspective view, Fig. 2 is a front view, Fig. 3 is a rear view, and Fig. 4 is a plan view. Fig. 5 is Fig. 4 - line arrow view, Fig. 6
The figure is Fig. 4 - line arrow view, Fig. 7 is Fig. 4 -
Fig. 8 is a cross-sectional view taken along lines taken from Fig. 4, Fig. 9 is a perspective view showing the locking structure at the insertion end of the magnetic sheet, and Fig. 10 shows the track position adjustment device. 11 is a plan view showing the recording surface of the magnetic sheet, FIG. 12 is an enlarged sectional view of the same, and FIG. 13 is an enlarged plan view of the recording track portion of the same. Also, in the symbols used in the drawings, 8a, 8
b... Arc-shaped reference surface constituting an example of a pair of reference surfaces, 10... Opening/closing lid, 13... Film, 14...
...air layer, 25a, 25b...rotating magnetic head constituting an example of a rotary head, 93...magnetic sheet constituting an example of a sheet-like recording medium.

Claims (1)

[Scope of utility model registration request] A recording and reproducing device configured to perform recording or reproducing by mounting a sheet-like recording medium in an arc shape around a rotating head and moving the sheet-like recording medium and the rotating head relatively in the direction of the rotation axis of the rotating head, the recording and reproducing device is characterized in that it is equipped with a pair of arc-shaped reference surfaces provided at both ends of the rotating head in the direction of the rotation axis, an opening and closing lid that holds the sheet-like recording medium in an arc shape, and a flexible film attached in an arc shape to the inner surface of the opening and closing lid with an air layer between them, the sheet-like recording medium is wrapped in an arc shape with the film, and both ends of the sheet-like recording medium are pressed and fixed against the pair of reference surfaces.