JPH0522314B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a so-called electronic camera in which still image information, etc. is magnetically recorded by forming a plurality of recording tracks on a magnetic sheet, or a magnetic sheet recorded by the electronic camera. The present invention relates to a small, accurate, and inexpensive feeding mechanism for a recording or reproducing head that is incorporated into a reproducing device for viewing still images.

In recent years, several so-called electronic cameras and their reproducing devices have been proposed, which record and reproduce still images using a disk-shaped magnetic sheet that is stored in a jacket and used in a cassette style. When commercializing this type of device, a small and simple mechanical structure is required in order to make it a low-cost product with high portability and operability. On the other hand, in order to record video signals of a plurality of high-quality screens on a plurality of tracks on a small magnetic sheet, it is necessary to increase the density of magnetic recording. In addition, in order to maintain compatibility between products so that there will be no problems or performance deterioration even if the magnetic sheets are replaced and used in multiple products for such recording and playback, it is necessary to The positioning accuracy of the magnetic head relative to the magnetic sheet must be increased. Furthermore, since the recording wavelength is short for high-frequency signals such as video signals, it is possible to reduce the reduction in reproduction output due to the difference in the angle of inclination of the magnetic head gap with respect to the recording track during recording and reproduction, so-called azimuth loss. Consideration must also be given to

Therefore, for example, magnetic head feeding devices incorporated into electronic cameras and their playback devices need to be made smaller and simpler in order to reduce the size and cost of the main body, while at the same time maintaining compatibility and image quality between products. High precision is required for this purpose.

Conventionally, the mechanism for moving and positioning the magnetic head in the radial direction of a device that records and/or reproduces signals by forming a plurality of concentric recording tracks on a disk-shaped magnetic sheet has been a system that uses a steel belt or a lead screw and a motor. Generally, a combination mechanism for linearly moving a magnetic head support member or a mechanism for disposing a magnetic head on a rotary arm member and rotationally moving the head in the radial direction of a recording track are common. When trying to incorporate a magnetic recording (playback) device using these mechanisms into an electronic camera and its playback device, if the former mechanism is used, the motor must have a high rotation angle accuracy to increase the head positioning accuracy. In addition, it became necessary to use a material that could increase the precision of the winding shaft of the lead screw steel belt, and to make the winding shaft of the lead screw steel belt highly accurate.
This makes it difficult to reduce prices. Also,
When using the latter mechanism, it is easy to make the device smaller and simpler, but it has the disadvantage that it is difficult to maintain compatibility between products because the magnetic head does not move in a straight line and at equal pitches. Furthermore, since the movement of the magnetic head is rotational movement, it is difficult to take into account the reduction of azimuth loss.

SUMMARY OF THE INVENTION The present invention aims to solve these problems and provide a magnetic head feeding device that maintains high precision and compatibility, is small in size and has a simple structure, and is suitable for being incorporated into an electronic camera and its playback device. It is something.

That is, in the magnetic head feeding device of the present invention to achieve such an object, a plurality of concentric recording tracks are formed by controlling the position of a magnetic head on a rotating magnetic sheet housed in a jacket, or a plurality of concentric recording tracks are formed. In a magnetic head feeding device for reproducing recorded signals from a recording track, a magnetic head supporting member for supporting a magnetic head and a magnetic head driving means for moving the magnetic head supporting member toward the rotation center of the rotating magnetic sheet are provided. , a guide member for linear movement, and an adjusting means for rotationally adjusting the direction of the guide member, and the magnetic head driving means is equipped with, for example, a rotary arm and a rotation angle of the rotary arm. and a cam member that regulates the movement, and the cam member is, for example, attached so as to be adjustable.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a schematic cross-section of a magnetic recording/reproducing device equipped with a magnetic sheet jacket including a head feeding device according to the present invention, and FIG. 2 shows a magnetic sheet jacket and an upper guide for regulating the position of the magnetic sheet. FIG. 2 is a plan view of a magnetic recording and reproducing apparatus including a head feeding device according to the present invention, with the upper cover member to which the plate is attached removed.

In FIG. 1, the magnetic sheet 3 in the magnetic sheet jacket 2 supported parallel to the mounting board 1 is
An integrally provided center core 4 is inserted into and supported by a drive spindle 9 of a magnetic sheet rotation motor 8 so as to be rotated at a constant speed. 10
1 is a magnetic head for recording and reproducing still image signals, and is mounted on a magnetic head support member 11 with mounting screws 12 so that its position can be finely adjusted.
Reference numerals 6 and 7 designate an upper guide plate and a lower guide plate for regulating the position of the magnetic sheet so as to maintain stable contact between the magnetic sheet 3 and the magnetic head 10. The upper guide plate 6 is fixed to the upper cover member 5, and the lower guide plate 7 is fixed to the boss portion 13 of the mounting board 1, and they are supported so as to be parallel to each other and maintain a predetermined distance across the magnetic sheet 3. ing. Further, the lower guide plate 7 has a long hole 7 so that the magnetic head 10 can be moved.
The upper cover member 5, which supports the upper guide plate 6, has a hole between the operating position (shown) and the retracted position (not shown) so that the magnetic sheet jacket 2 can be replaced and used. The device body is movably supported by a mechanism (not shown).

As shown in FIG. 2, the magnetic head support member 11
There are two sliding bearings 1 on the head movement guide shaft 14.
5, the magnetic head is supported so as to be linearly movable in the radial direction of rotation of the magnetic sheet 3. The magnetic head support member 11 is further movably supported via a bearing block 17 on a support guide shaft 16 for height regulation. The head movement guide shaft 14 and the support guide shaft 16 have a movement guide shaft support member 18 and a support guide shaft fixing portion that are precisely machined to linearly move the magnetic head 10 parallel to the magnetic sheet 3 at a constant height. 23a, 23
b with shaft holding plates 19 and 24, respectively. The support guide shaft fixing parts 23a and 23b are integrated with the mounting board 1, but when the movable guide shaft support member 18 loosens the stop shaft 20 and the set screw 21, the stop shaft 20 moves against the mounting board 1. After adjusting with the eccentric adjustment pin 22, the mounting board 1 can be rotated with the stop shaft 20 and the stop screw 21.
It is becoming fixed. Therefore, while the sliding bearing 15 is fixed to the magnetic head support member 11, the bearing block 17 is fixed to the support member 11.
The magnetic head support member 11 can be moved in the horizontal direction between the head movement guide shaft 14 and the support guide shaft 16 by absorbing a slight deviation in parallelism between the head movement guide shaft 14 and the support guide shaft 16 due to the position adjustment of the movement guide shaft support member 18. to ensure smooth and reliable movement. The sliding bearing 15 and the bearing block 17 are made of members that generate less frictional force to ensure smooth operation.
For example, by using a self-lubricating material, it is desirable that the fitting clearance between the moving guide shaft 14 and the support guide shaft 16 be minute in order to improve the positional accuracy of the magnetic head.

Further, the mechanism of the device according to the present invention is illustrated in FIG. 3, which is a detailed plan view of an embodiment, and FIG. 4, which is a sectional view thereof.

As mentioned above, the boss portion 17a, which is a cylindrical projecting portion of one portion of the rectangular bearing block 17, is loosely fitted into the magnetic head support member 11. Further, the upper surface of the bearing block 17 is in contact with the flat surface of the head support member 11 due to the pressing force of the leaf spring 25 attached to the support member 11 via the spacer 25', and as a result, the magnetic head support The member 11 is movable relative to the bearing block 17 in parallel to the magnetic sheet 3 and in the radial direction of the support guide shaft 16 by a slight amount (by the amount of the gentle fitting gap).

In the above configuration, the behavior of the bearing block 17 when the head movement guide shaft 14 is out of parallel with the support guide shaft 16 due to azimuth adjustment of the magnetic head 10 will be explained using FIG. . In FIG. 5a, the magnetic head 10 is connected to the magnetic sheet 3.
When moving near the outermost periphery (toward the top of the diagram),
FIG. 5b shows the case where the magnetic head 10 has moved near the innermost circumference of the magnetic sheet 2 (downward in the figure). In addition, in these figures, the inclination of the head movement guide 14 is exaggerated compared to the actual state in order to explain the behavior of the bearing block 17. In the figure, the head movement guide shaft 14 has a V-shape with respect to the support guide shaft 16 in order to adjust the azimuth of the magnetic head 10, and the distance between the two shafts becomes wider toward the bottom.

In FIG. 5a, when the magnetic head 10 is close to the outermost periphery of the magnetic sheet 3, the distance between the head movement guide shaft 14 and the support guide shaft 16 is narrow, so the bearing block 17 is positioned within the above-mentioned fitting gap. It moves to the left with respect to the head support member 11 as far as it allows. On the other hand, in FIG. 5b, the magnetic head 10
When the magnetic sheet is close to the innermost circumference of the magnetic sheet, the distance between the head movement guide shaft 14 and the support guide shaft 16 is wide, so that the bearing block 17 is moved as far as the above-mentioned fitting clearance allows with respect to the head support member 11. Move to the right. When the magnetic head support member 11 and the bearing block 17 move in the thrust direction of the support guide shaft 16, the bearing block 17 moves between the leaf spring 25 and the bent portion of the magnetic head support member 11 (the boss 17a and the magnetic head support member 11). The bearing block 17 does not fall off from the magnetic head support member 11. Further, the leaf spring 25 adjusts the vertical height of the magnetic head support member 11 to the head movement guide shaft 14 and the support guide shaft 16, and at the same time generates an appropriate frictional force between the magnetic head support member 11 and the support guide shaft 16. The magnetic head 10 operates to attenuate vibrations of the apparatus body from being transmitted to the magnetic head 10.

As described above, even if the two guide shafts are not parallel, the bearing block 17 moves in the radial direction of the support guide shaft 16 and in the direction parallel to the magnetic sheet 3, thereby smoothly moving the head support member 11. It can be moved, and the magnetic head 10 and magnetic sheet 3
The contact between the two is certain. Furthermore, since the bearing block 17 does not move in the direction perpendicular to the magnetic sheet 3, as a result, the contact distance between the magnetic head 10 and the magnetic sheet 3 does not change, and the state of contact between the magnetic sheet 3 and the magnetic head 10 does not change. remains constant.

Pin 27 implanted in the magnetic head support member 11
A tension spring 26 is applied to the head movement guide shaft 14 and the sliding bearing 15 due to the tension force between the tension spring 26 and the pin 28 attached to the mounting board. Eliminating backlash and further backlash between a mechanism for regulating the amount of movement of the magnetic head and the magnetic head support member 11, which will be described later,
This enables highly accurate positioning of the magnetic head 10.

The magnetic head moving arm 29 is rotatably attached to the mounting board 1 by a rotating shaft 31 and a bearing 30 which is elongated so as to reduce vibration in the vertical direction (direction perpendicular to the magnetic sheet). A rotary roller 32 that abuts the hanging portion 11a of the magnetic head support member is mounted approximately in the center of the head moving arm 29, and a rotary roller 33 that abuts the head position regulating cam 34 is rotatably attached to the tip of the head moving arm 29. It is being Ball bearings may be used for the rotating rollers 32 and 33 to ensure smooth movement.

On the other hand, the mounting board 1 is provided with a mechanism for automatically feeding the magnetic head 10 according to the number of recording tracks concentrically recorded on the magnetic sheet 3. This feeding mechanism includes a ratchet gear 36 disposed coaxially with the first gear 35, and a second gear 37 fixedly disposed coaxially with the ratchet gear 36.
A third gear 38 meshing with the third gear 38, the aforementioned head position regulating cam 34 coaxially fitted with this gear and integrated with the adjusting and fixing screw 39, and a rotating roller abutting the head position regulating cam 34. The ratchet portion 36 of the ratchet gear 36 is intermittently pressed in order to rotate the head moving arm 29 to which the head position regulating cam 33 is attached and the head position regulating cam 34 in a predetermined direction, thereby rotating the head moving arm 29. It is composed of a ratchet feed pawl 40. The ratchet feed pawl 40 is rotatably attached to one end 41a of a substantially L-shaped swing link 41, and the feed pawl 40 is located near the feed pawl 40.
A guide pin 42 is implanted on the mounting board 1 to guide the 0 correctly. The above swing link 41
The other end 41b is rotatably connected to one end 43a of the reciprocating link 43. This reciprocating link 43
The other end 43b extends so as to come into contact with the eccentric cam 44. The eccentric cam 44 is connected to a shaft 45 that is linked to a drive motor (not shown) of a mechanical part of the camera body (for example, a shutter or a reflection mirror mechanism of a single-lens reflex camera).
The rotation of the drive motor is converted into the reciprocating motion of the reciprocating link 43. In the case of a playback device, the shaft 45 is linked to a dedicated motor for moving the head, or the reciprocating link 43
What is necessary is to configure it so that it can be operated directly by a solenoid device. Note that the other end of a tension spring 46 whose one end is latched to the mounting board 1 is hung in the middle of the reciprocating link 43, and urges the reciprocating link 43 in the direction of the eccentric cam 44. .

Near the reciprocating link 43, a ratchet reverse prevention pawl 47 for preventing the ratchet gear 36 from reversing is rotatably mounted on the base plate 50 on the feed mechanism. This reversal prevention pawl 47 has an engaging portion 47a that engages with the ratchet portion 36a of the ratchet gear 36.
A spring (not shown) is applied to keep the body pressed in at all times. Furthermore, a release pin 48 is disposed at a position facing the pressed portion 47b on the opposite side of the engaging portion 47a of the claw 47, and the release pin 48
It operates to release the engagement between the engaging portion 47a and the ratchet portion 36a when replacing. That is, when the magnetic sheet jacket 2 is set,
The release pin 48 is in the position shown in FIG. 3 so that the engaging portion 47a and the ratchet portion 36a are elastically engaged, but the magnetic sheet jacket 2
When a jacket detection member (not shown) detects that the release pin 48 is removed from the main body of the apparatus for replacement, the release pin 48 moves in the direction of arrow A against the biasing force of the spring to release the pressed part. 47b is pressed so that the anti-reverse rotation claw 47 is brought to a position where it can be rotated counterclockwise. On the other hand, one end 49a of a reversing spring 49 is applied to the third gear 38, which is integrally fixed to the head position regulating cam 34, so as to apply a clockwise rotating force. The other end of this reversing spring 49 is hung on the base plate 50 on the feed mechanism, and is connected between the third gear 38 and the second gear 37 and the ratchet portion 36a of the ratchet gear 36.
It operates to eliminate looseness due to the engagement clearance between the engagement portion 47a of the claw 47 and the engagement portion 47a of the claw 47. Furthermore, reversal spring 4
9 rotates the third gear 38 clockwise when the engagement between the anti-reverse pawl 47 and the ratchet gear 36 is released when the magnetic sheet jacket 2 is replaced and removed. The provided pin 38a is operated to return the head to the head feed start position (the state shown in FIG. 3) where it comes into contact with the stopper protrusion 50a of the substrate 50 on the feed mechanism.

The track position indicating pin 52, which is disposed coaxially with the counter drive gear 51 that meshes with the first gear 35, is connected to the first gear 35, the ratchet gear 36, the second gear 37, the third gear 38, and the head position regulating cam 34. The magnetic head 10 rotates in conjunction with a series of rotational operations to indicate the feeding position of the magnetic head 10. Also,
If a counter indicating the number of recorded still images is provided in the magnetic sheet jacket housing, it is also possible to advance the counter in conjunction with the track position indicating pin 52.

Next, the operation of the apparatus of the present invention having the above configuration will be explained.

First, the operation when the present invention is incorporated into a so-called electronic camera that records still images will be described. When the shutter button of the camera is pressed with the magnetic sheet jacket 2 inserted into the magnetic recording device within the camera body, the magnetic sheet rotation motor 8 rotates the magnetic sheet 3 via the drive spindle 9. Thereafter, the shutter operates, and still image information is magnetically recorded by the magnetic head 10 on the bottom surface of the outermost periphery of the magnetic sheet 3, where the video signal obtained from the imaging device rotates at high speed so as to form an annular recording track. .

Immediately after the recording operation by one revolution of the magnetic sheet 3 is completed, the drive motor that drives the operations of each mechanical part of the camera (for example, shutter charge, return operation of the reflection mirror automatic aperture mechanism in the case of a single-lens reflex camera, etc.) is activated. The shaft 45 rotates, and the shaft 45 also rotates in conjunction with the rotation. The axis 45 rotates once (360°) for each screen shot, and the first half of the rotation is 1/2 (180°).
The reciprocating link 43 is moved to the right in the figure by the pressure of the eccentric cam 44. In accordance with this movement, the swing link 41 rotates counterclockwise, and the feed pawl 40 also moves in the direction of arrow B in the figure. The feed claw 40 is in the direction of arrow B.
When it starts to move in the direction, its tip 40a first sinks into the ratchet part 36a of the ratchet gear 36, and when it moves further, the ratchet gear 36 is rotated clockwise by an angle that is more than one ratchet thread and less than two ratchet threads. Therefore, the reversal prevention claw 47
falls into the valley of the ratchet part 36 next to the peak.
After that, when the shaft 45 makes the second half rotation (180° rotation), the reciprocating link 43 returns to the left direction in the figure.
In conjunction with this, the swing link 41 also returns clockwise, and the feed pawl 40 also returns in the direction opposite to arrow B. At this time, the ratchet gear 36 is also rotated counterclockwise by the biasing force of the reversing spring 49, but the engaging portion 47a of the reversing prevention pawl 47
It falls into the trough of a and is locked, so it stops at the position where it has been moved by exactly one ratchet tooth. In this way, the reciprocating link 4 is operated by one rotation of the shaft 45.
When one reciprocating operation of 3 is completed, the magnetic head feeding mechanism has been moved for one screen by the photographing operation for one screen. Ratchet gear 3
6 rotates clockwise by one ratchet tooth, the second gear 37 and the third gear 38
The head position regulating cam 34 fixed to the third gear 38 also rotates counterclockwise. Further, since the biasing force of the tension spring 26 is applied to the magnetic head moving arm 29 via the magnetic head support member 11 and the rotating roller 32, the head position regulating cam 3
4, the magnetic head moving arm 29 rotates clockwise and the magnetic head support member 11 moves in the direction of arrow C (inner circumferential direction of the recording track).

After the shooting operation for one screen is completed, if the shutter release operation of the camera is performed again, the shooting of the second screen and subsequent screens, magnetic recording, and movement of the magnetic head (switching of recording tracks) will be repeated in the same manner as above. It turns out. Note that the lift amount of the cam surface for each rotation angle of one screen of the head position regulating cam 34 is determined by the rotating roller 3 attached to the magnetic head moving arm 29 that rotates to follow this.
If the cam shape is determined so that the movement component in the direction parallel to the head movement guide shaft 14 (that is, the radial direction of the recording track) is constant, the magnetic head 10 fixed to the magnetic head support member 11 can be moved easily.
The feed amount can be made constant for each screen. As a result, the circular recording tracks such as still image information magnetically recorded on the magnetic sheet 3 can be arranged at almost equal pitches. Furthermore, as in the embodiment of the present invention, of the two rotating rollers urged by the magnetic head moving arm 29, the shaft 31 of the rotating roller 33 that contacts the head position regulating cam 34
By configuring the rotation radius around the shaft 31 of the rotary roller 32 that contacts the magnetic head support member 11 to be smaller (approximately 1/2 in this embodiment) than the rotation radius around the magnetic head support member 11, the head position regulating cam 3
The error in the feed amount of the magnetic head 10 due to the manufacturing error of No. 4 is reduced. As mentioned above, the rotation angle of the head position regulating cam is determined by the ratchet gear 36.
At the same time, it is securely held by the anti-reverse claw 47,
Since the play in each part of the head feeding mechanism is eliminated by the tension spring 26 and the reversing spring 49, it is possible to make the linear movement accuracy of the magnetic head 10 very high.

Further, in the embodiment of the present invention, the ratchet gear 36
The feed pawl 40 can be placed in a position where it does not come into contact with the ratchet teeth 36a of the ratchet gear 36 after the end of the photographing operation and before starting the next photographing operation. Regardless of the number of photographic frames, if the magnetic sheet jacket is removed and replaced, the magnetic head feeding mechanism is constructed so that it can be returned to the starting position by the biasing force of the reversing spring 49, as described above.

Above, we have explained the operation when the device according to the present invention is incorporated into a so-called electronic camera.
When this device is incorporated into a playback device for an electronic camera, the operation is completely the same except for some operations. That is, in a still image reproducing apparatus, unlike a camera, the head is moved not by operating a shutter button but by operating a head feeding button which is operated at any time. Therefore, in the feed mechanism shown in FIGS. 2 and 3, the reciprocating link 43 is configured to operate in response to the operation of the head feed button. Therefore, the eccentric cam 44 is operated at any time by a dedicated motor instead of the camera mechanism drive motor, or the reciprocating link 43 is configured to be operated by direct button pressure or a solenoid that responds to button operation, but the reciprocating link The operations below 43 are accomplished in exactly the same way.

Furthermore, the apparatus according to the present invention allows precise adjustment of the position of the recording/reproducing head 10 so that high-quality signal recording and reproduction is possible even when the magnetic sheet jackets are exchanged between a plurality of products. This adjustment will be explained below.

First, the magnetic head 1 is mounted on the magnetic head support member 11.
0, the mounting screws 12 are fastened so that the gap of the magnetic head 10 is at a constant distance from the two sliding bearings 15 and parallel to the axis passing through the two bearings. Thereafter, the head movement guide shaft 1 determines the moving direction of the magnetic head support member 11.
The movable guide shaft support member 18 supporting the moving guide shaft 4 is rotated by a minute angle around the stop shaft 20 by rotating the two adjustment eccentric pins 22. With this adjustment, the magnetic head 1 is moved through the movable guide shaft 14 fixed to the movable guide shaft support member 18.
It is possible to keep the torsion error and parallel deviation error of the gap angle of the magnetic head with respect to the center of rotation of the magnetic sheet 3 to below the allowable value over the entire range of movement of the magnetic sheet 3, and the so-called azimuth loss during recording and reproduction can be kept very small. can be taken as a thing. If the stop shaft 20 and the set screw 21 are tightened after the above adjustment, the magnetic head 10 will reliably move in a straight line with very little twist or deviation from the center of rotation of the magnetic sheet 3, and the movement pitch will be the same as described above. Due to the structure, the pitch is maintained at equal distances by the head position regulating cam 34. Therefore, in order to further set the distance from the rotation axis center of the magnetic sheet 3 of the magnetic head 10 for recording and reproduction to a predetermined value, a third
Head position regulating cam 34 attached to gear 38
The magnetic head 10 is rotated by a minute angle on the same axis and fixed with a set screw 39 to precisely determine the movement start position of the magnetic head 10. The head position regulating cam 34 is precisely fitted to the rotating shaft, and 34a is a tool hole for rotation adjustment. With this adjustment, when recording and playing back a circular recording track,
The movement of the magnetic head 10 is not only made so that the tracks are equally spaced, but also highly accurate positioning is possible with respect to the absolute position of each track number.

As described above, according to the present invention, concentric tracks are formed on a rotating magnetic sheet, or a magnetic head feeding device for reproducing recorded numbers from the concentric tracks can be created with high accuracy and in a small size without using a stepping motor or the like. Moreover, it can have a simple configuration.
Furthermore, in cases where the magnetic sheet is housed in a jacket to form a cassette and the cassette is used interchangeably, for example, in the case of electronic cameras and their playback devices, it is possible to ensure the necessary compatibility, that is, to unify the recording format. Therefore, it is possible to provide a magnetic head feeding device suitable for incorporation into an electronic camera and its playback device.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view of an embodiment of a magnetic recording and reproducing apparatus including a head feeding device according to the present invention, FIG. 2 is a plan view of a magnetic recording and reproducing device including a head feeding device according to the present invention, and FIG. Example detailed floor plan,
FIG. 4 is a sectional view taken in the direction of the arrow in FIG. 3. Fifth
The figure is a schematic plan view of a magnetic recording/reproducing device for explaining the behavior of a bearing block in the same embodiment. DESCRIPTION OF SYMBOLS 1... Mounting board, 2... Magnetic sheet jacket, 3... Magnetic sheet, 8... Magnetic sheet rotating motor, 10... Magnetic head, 11... Magnetic head support member, 14... Head movement guide shaft, 15...
...Sliding bearing, 16...Support guide shaft, 17...Bearing block, 18...Movement guide shaft support member, 2
0... Stop shaft, 22... Eccentric pin for adjustment, 25...
...Plate spring, 26...Tension spring, 29...Magnetic head moving arm, 32, 33...Rotating roller, 3
4... Head position regulating cam, 35... First gear,
36...Ratchet gear, 37...Second gear, 3
8...Third gear, 40...Ratchet feed pawl, 4
1... Swing link, 42... Guide pin, 43...
... Reciprocating link, 44 ... Eccentric cam, 47 ... Ratchet reverse prevention pawl, 48 ... Release pin, 49 ...
Reversing spring, 51... Counter drive gear, 52...
Track position indication pin.

Claims (1)

[Scope of Claims] 1. Magnetic recording and reproduction in which a plurality of concentric recording tracks are formed by controlling the position of a magnetic head on a rotating magnetic sheet housed in a jacket, or recording signals are reproduced from the concentric recording tracks. In the apparatus, a magnetic sheet rotation drive signal that rotates a magnetic sheet, a mounting board that fixes and holds the magnetic sheet rotation driving means, and a magnetic sheet that moves relative to the mounting board in a plane parallel to a rotation plane of the magnetic sheet. first possible
The guide shaft, the second guide shaft fixed to the mounting board, and the first guide shaft are slidable in the axial direction, and the second guide shaft and the magnetic a support member for supporting the head; a magnetic head drive means for moving the magnetic head support member along the first and second guide shafts with respect to the rotation center of the magnetic sheet rotation drive means; azimuth angle adjusting means provided on the mounting board so as to make the mounting position of the first guide shaft relative to the mounting board movable in order to adjust the azimuth angle after the head is mounted on the magnetic head support member; A magnetic recording and reproducing device characterized by comprising: