JPH0466076B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field to which the Invention Pertains] The present invention provides a system for storing still image information, etc. on a rotating magnetic sheet.
The present invention relates to a magnetic sheet device that sequentially moves a magnetic head in the radial direction to form a plurality of tracks for recording/reproducing or both recording and reproducing.

[Background of the Invention] In recent years, electronic cameras and their reproducing devices that record and reproduce still images by rotating a magnetic sheet housed in a small jacket at high speed and sliding a magnetic head that moves intermittently in the radial direction of the rotating magnetic sheet have been developed. Various magnetic sheet devices have been proposed to be incorporated into and used in.

This type of device is used by being built into the main body of the camera or playback device, so it is necessary to be small and at the same time have high magnetic recording density in order to obtain high-quality video signals. be. In addition, in order to maintain compatibility between products, the positional relationship between the magnetic head and the magnetic sheet must be maintained with high accuracy so that performance does not deteriorate even if the magnetic sheet is used interchangeably between multiple products. Is required.

Furthermore, in order to ensure that the recording surface of the rotating magnetic sheet and the magnetic head come into contact with each other for stable recording and reproduction, the position of the magnetic sheet may be regulated by a guide plate or pad so that it comes into contact with the magnetic head. required.

However, when this type of magnetic sheet device is incorporated into a camera or the like, it is expected that the magnetic sheet jacket will be left in the device for a long period of time. In this case, the magnetic sheet is continuously pressed against a pressure plate or the like by a magnetic head, and the sheet is left unrotated for a long period of time, making it easy for the magnetic sheet to be deformed. If the magnetic sheet is deformed and magnetic recording or reproduction is performed as it is, the contact between the magnetic sheet and the magnetic head becomes unstable at that portion, which is undesirable as it causes a decrease in output or dropout.

Therefore, after the magnetic sheet is attached, when there is no recording or reproducing operation, that is, when the magnetic sheet is on standby, the magnetic head and the magnetic sheet may be configured so that they are released from the pressure contact state and are separated from each other, for example, the magnetic head is retracted. One idea is to configure the head so that the pressure plate, etc. can be retracted, but moving the magnetic head poses a problem in maintaining the positional relationship with the magnetic sheet with high accuracy, and moving the pressure plate, etc. This is undesirable because it increases the thickness and dimensions of the member (lid) into which the magnetic sheet is inserted.

[Object of the present invention]

The present invention has been made in view of these problems, and aims to realize a magnetic sheet device that can prevent deformation of the magnetic sheet without impairing the high accuracy of the positional relationship between the magnetic sheet and the magnetic head. It is.

[Summary of the invention]

The device according to the present invention releases the pressed state between the magnetic sheet and the magnetic head during standby, and includes a support member that supports the magnetic head and a guide member that restricts the linear movement of the support member.
In order to enable the support member to move between a position for magnetic recording or reproduction and a standby position for neither recording nor reproduction, the guide member is connected to a first guide shaft fixed to the mounting board. and a second guide shaft fixed to the mounting board at a position opposite to the first guide shaft with the magnetic head interposed therebetween, the magnetic head support member being attached to the first guide shaft. a first guide shaft is rotatably mounted as a rotating shaft, and a pressing means for bringing the magnetic head support member and the second guide shaft into contact with each other; The present invention is characterized in that it includes a rotation drive means for rotating the head support member away from the second guide shaft.

〔Example〕

FIG. 1 is a schematic sectional view showing an example of a magnetic sheet device according to the present invention, in which a magnetic sheet jacket is shown attached. FIG. 2 is a plan view of the same, with the upper cover member and magnetic sheet jacket 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 signals such as still images, and is fixed to a magnetic head support member 11 so that its position can be finely adjusted. Reference numerals 6 and 7 denote 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 the upper cover member 5
The lower guide plates 7 are each fixed to the boss portions 13 (shown in FIG. 3) of the mounting board 1, and are supported so as to be parallel and maintain a predetermined distance across the magnetic sheet 3. . Furthermore, the lower guide plate 7
is provided with a long hole 7a so that the magnetic head 10 can be moved.
The upper cover member 5 supporting the upper guide plate 6 has a well-known position between the operating position (shown) and the retracted position (not shown) so that the magnetic sheet jacket 2 can be replaced and used. It is movably supported by the device body by a mechanism (not shown).

As shown in FIG. 2, the magnetic head support member 11
supports the magnetic head 10 so as to be linearly movable in the rotational radial direction of the magnetic sheet 3 via two sliding bearings 15 which are rotatably and slidably fitted to the head movement guide shaft 14. has been done. The magnetic head support member 11 further has a bifurcated tip 11a.
and 11b, and these tip portions 11a, 1
A support guide shaft 16 for height regulation is supported between 1b so as to be inserted with a predetermined gap length. The head movement guide shaft 14 and the support guide shaft 16 are round bars with high linearity and external diameter machining accuracy.
Shaft fixing blocks 17a, 17 integrated with mounting board 1
b, 19a, 19b are provided with shaft holding plates 18, 2, respectively.
0 and are fixed parallel to each other.
The two sliding bearings 15 are connected to the magnetic head support member 11.
The magnetic head 10 is fixed at a distance so that the bearing length is sufficiently long, and in order to improve the positional accuracy of the magnetic head 10, the fitting clearance with the moving guide shaft 14 is kept small (for example, several μm). .

The magnetic head support member 11 includes an electromagnet support plate 2.
An electromagnet 22 is attached via 1. The attracting iron piece 23 facing the yoke of this electromagnet 22 is
It is fixed to the mounting board 1 with an adjustment washer 24 (shown in FIG. 4) so that the mounting height can be adjusted.

FIG. 3 is a plan view showing each part in FIG. 2 in more detail, FIG. 4 is a cross-sectional view taken along line XX in FIG. 3, FIG. indicates a standby state.

In these figures, a head substrate 10a to which a magnetic head 10 is fixed is attached to a magnetic head support member 11 with attachment screws 12. Reference numerals 11d and 11e are eccentric adjustment pins that abut and fit into the V-shaped groove and U-shaped groove provided at both ends of the head board 10a, respectively, and are rotatably implanted in the magnetic head support member 11. has been done.
In addition, a leaf spring 25 is attached near the bifurcated tips 11a and 11b, and in the direction of pressing one of the bifurcated tips 11a against the support guide shaft 16.
A biasing force is applied to the magnetic head support member 11.

Due to the biasing force of the leaf spring 25, the magnetic head support member 11 is rotated clockwise (in the direction in which the magnetic head 10 moves away from the magnetic sheet 3) in the clockwise direction in FIG. In the normal (standby state), as shown in FIG. There is almost no contact between the two, and the two are slightly separated from each other.

When performing magnetic recording and reproduction on the magnetic sheet 3 from a standby state as shown in FIG. 4b, the electromagnet 22 is energized to bring the state as shown in FIG. 4a. It is assumed that the electromagnet 22 is connected to a sequence control circuit (not shown) that is energized only during recording and reproduction.

That is, when the electromagnet 22 is energized, the magnetic head support member 11 rotates counterclockwise against the biasing force of the leaf spring 25 due to the attractive force between the yoke portion of the electromagnet 22 and the adsorption iron piece 23. Then, the state shown in FIG. 4a is reached. At this time, a gap is created between the one end 11a of the magnetic head support member 11 and the support guide shaft 16, and the magnetic head 10
is pushed into the magnetic sheet 3 and comes into contact with it, and becomes ready for recording or reproduction.

The position after rotation of the magnetic head support member 11 is determined by the amount of rotation until the yoke portion of the electromagnet 22 and the attraction piece 23 come into contact. In this embodiment, the amount (rotation amount) of the magnetic head 10 pushed into the magnetic sheet 3 during magnetic recording and reproduction is
3 from the mounting board 1 is changed depending on the thickness of the adjustment washer 24, so that it can be adjusted during product assembly.

Note that the amount of rotation of the magnetic head support member 11 can be controlled by controlling one side 11b of the bifurcated tip of the magnetic head support member 11, without changing the height of the adsorption iron piece 23 from the mounting board 1. It may be regulated by contact with the support guide shaft 16. In this case, the yoke part of the electromagnet 22 and the adsorption iron piece 23 do not come into close contact with each other.
They become attracted to each other with a slight gap left.

When the recording and reproduction on the magnetic sheet 3 is completed and the power supply to the electromagnet is cut off, the magnetic head support member 11
Due to the biasing force of the leaf spring 25 again, the standby state shown in FIG. 4B is established, and the magnetic head 10 is slightly separated from the magnetic sheet 3.

By the above-described operation, the pressure contact state between the magnetic sheet 3 and the magnetic head 10 is released during standby.
Deformation of the magnetic sheet 3 can be prevented.

Next, the operations of other components in FIG. 3 will be explained.

Pin 27 implanted in the magnetic head support member 11
A tension spring 26 with a relatively weak biasing force 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. Highly accurate positioning of the magnetic head 10 is made possible by eliminating play caused by a slight fitting clearance and also play between the mechanism for regulating the amount of movement of the magnetic head and the magnetic head support member 11, which will be described later. .

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 11c 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 in accordance with recording track numbers recorded concentrically on the magnetic sheet 3. This feeding mechanism includes a ratchet gear 36 disposed coaxially with the first gear 35, and a second gear 3 fixedly disposed coaxially with the ratchet gear 36.
The third gear 38 meshes with the third gear 7, the aforementioned head position regulating cam 34 coaxially fitted with this gear and integrated with the adjusting and fixing screw 39, and the rotating gear that comes into contact with 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 roller 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 4 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).
5, and converts the rotation of the drive motor into reciprocating motion of the reciprocating link 43. In the case of a playback device, the shaft 45 shall be linked to a dedicated motor for moving the head, or the reciprocating link 4
3 may be configured to 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-mentioned configuration will be described, assuming that the present invention is incorporated into a so-called electronic camera that records still images. 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 is operated and the video signal obtained from the imaging device is magnetically recorded on the lower surface of the outermost periphery of the magnetic sheet 3 rotating at high speed by the magnetic head 10 so as to deform the annular recording track. . During this time, power is supplied to the electromagnet 22, and the electromagnetic head support member 11 is moved to the fourth position as described above.
The magnetic head 10 is in the position shown in Figure a, and is in sliding contact with the magnetic sheet 3.

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. The rotation angle of the head position regulating cam 34 is reliably held by the ratchet gear 36 and the reversal prevention pawl 47, and at the same time, the tension spring 26 and the reversal spring 49 are set to eliminate play in each part of the head feeding mechanism. The pitch error of the equally spaced rectilinear movement of the magnetic head 10 is kept extremely small. Therefore,
Furthermore, in order to maintain a predetermined distance from the center of rotation of the magnetic sheet 3 of the magnetic head 10 for recording, the head position regulating cam 34 attached to the third gear 38 is coaxially rotated by a small angle. Adjust and fix with set screws 39 to accurately 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.
By this adjustment, when recording an annular recording track, it is possible not only to move the magnetic head 10 so that the tracks are arranged at equal pitches, but also to perform highly accurate positioning of the absolute position for each track number. This results in high compatibility with fewer variations between multiple products.

Further, in the embodiment of the present invention, the ratchet gear 36
The feed claw 40 of the magnetic head 10 can be placed in a position where it does not come into contact with the ratchet gear 36a of the ratchet gear 36 after the end of the photographing operation until the start of the next photographing operation. Regardless of its position, if the magnetic sheet jacket is removed and replaced, the magnetic head feeding mechanism is constructed so that it can always return to the starting position by the biasing force of the reversing spring 49, as described above.

Up to this point, we have mainly described the movement of the magnetic head among the operations of the electronic camera to which the device of the present invention is applied.Next, we will discuss how to ensure the positioning accuracy of the magnetic head relative to the magnetic sheet, and how it can be moved by contact with the head of the magnetic sheet. The operation of the device of the present invention, which is capable of preventing deformation, will be explained using an example in which it is applied to an electronic camera.

In general, among the functions necessary to make a magnetic recording and reproducing device for video signals, etc. using a magnetic sheet as high as possible by minimizing the deterioration in signal quality that occurs during recording and reproducing, there are two functions that are necessary: The main points regarding positioning are as follows.

() When reproducing a magnetic sheet, a decrease in output due to deviation in the plane direction of the magnetic sheet from the annular recording track of the magnetic head is minimized.

() Minimize the reduction in reproduction output (space loss) due to a gap created between the contact surfaces of the magnetic sheet and the magnetic head when they come into sliding contact.

() Minimize the drop in output (azimuth loss) due to the inclination of the magnetic head gap during recording with respect to the gap of the magnetic head during reproduction.

Regarding the track deviation during recording/reproduction in (), the eccentricity due to the mechanism for linear movement of the magnetic head support member 11 mentioned above, the center core 4 integrated with the magnetic sheet 3, and the drive spindle 9 is fixed as much as possible. This can be achieved by a known mechanism such as that seen in, for example, Japanese Utility Model Application Publication No. 57-195674. Regarding the gap between the magnetic sheet and the magnetic head in parentheses, the amount by which the magnetic head 10 is pushed into the magnetic sheet 3 whose position is regulated is adjusted to a predetermined value by the upper guide plate 6 and the lower guide plate 7. By doing so, it is possible to achieve stable contact without vibration etc. with an extremely small gap (for example, 1 μm or less). In this embodiment, by adjusting the mounting height and inclination of the adsorbing iron piece 23 facing the electromagnet 22 to the mounting board 1, a predetermined position can be achieved over the entire movement range of the magnetic head support member 11 (all recording and reproducing tracks). The value is within the range. Furthermore, contact pressure is generated between the magnetic head 10 and the magnetic sheet 3 only when the electromagnet 22 is energized, so that the magnetic sheet 3 will not deform even if the magnetic sheet jacket is left attached to the device for a long period of time. It will not be damaged or damaged. ()
In order to reduce the drop in output due to differences in the azimuth angle of the magnetic head during recording and reproduction, even if magnetic sheet jackets are exchanged between multiple products, the gap of the magnetic head 10 relative to the magnetic sheet 3 must be It is necessary to manufacture the plurality of products so that the angles formed are approximately the same for each recording track. In the device of the present invention, the center of the gap of the magnetic head 10 remains on a straight line passing through the center of the drive spindle 9, which precisely regulates the center of rotation of the magnetic sheet 3, over the movement range of the magnetic head 10. (with an error of about 0.01 mm), so that the magnetic head supporting member 11 of the magnetic head 10 is moved as much as possible while minimizing the rattling and misalignment of the magnetic head supporting member 11 with respect to the head movement guide shaft 14 so that the magnetic head 10 can track with good reproducibility. The mounting position can be precisely adjusted.

That is, as described above, the magnetic head support member 11 has two sliding bearings 15 which have a very small fitting gap (several μm) with the head movement guide shaft 14 and are fixed at two locations spaced apart so that the bearing length is sufficiently long. , movement and rotation other than linear movement in a plane parallel to the magnetic sheet 3 are extremely small (about a few micrometers of movement and 1 inch or less of rotation).Therefore, the head substrate 10a to which the magnetic head 10 is fixed The magnetic head support member 11
When the magnetic head 10 is installed in If the position of the head board 10a is finely adjusted so that the distance from the guide shaft 14 to the center of the drive spindle 9 is finely adjusted, the center of the gap of the magnetic head 10 will hardly deviate from the straight line passing through the center of the drive spindle 9. You can now move the track with . To adjust the position of the head board 10a during installation, for example, as shown in this embodiment, before completely tightening the mounting screws 12 to the magnetic head support member 11, rotate the eccentric adjustment pin 11d to adjust the position of the head board 10a. This can be easily done by configuring the head substrate 10a to be moved minutely in a direction perpendicular to the head movement guide shaft 14 by pressing the V-shaped groove.

In this embodiment, after adjusting the position of the center of the gap of the magnetic head 10, the adjustment eccentric pin 11e fitted in the V-shaped groove of the head substrate 10a is rotated to adjust the gap of the magnetic head 10 relative to the recording track. The angle (azimuth angle) can be adjusted. At this time, when the V-shaped groove of the head board 10a is pressed against the adjustment pin 11d, the head board 10a rotates about the adjustment pin 11d. Therefore, the adjustment pin 11
If d is placed close to the magnetic head 10 as shown in FIG. 3, and the adjusting eccentric pin 11e is placed far enough away from the magnetic head 10, the rotation of the adjusting eccentric pin 11e is prevented. Therefore, the azimuth angle of the gap of the magnetic head 10 can be easily adjusted at a minute angle. Since the configuration is such that the position adjustment using the above two adjustment pins is performed so that the azimuth angle between multiple products becomes a predetermined value, and then the fixing is performed using the mounting screw 12, the playback output decreases due to azimuth loss. can be held down to a minimum.

In addition, in this embodiment, the movement of the magnetic head 10 and the magnetic sheet 3 toward and away from each other in order to prevent deformation of the magnetic sheet 3 is performed using a head movement guide shaft 14 that is a guide shaft for linear movement of the magnetic head support member 11. Since the sliding bearing 15 for linear movement, which has rotational movement around the rotation center and has a sufficiently long bearing length, is used as the bearing for this rotational movement, the positioning accuracy of the magnetic head 10 of the linear movement mechanism for the magnetic head can be improved. A mechanism for preventing deformation of the magnetic sheet has been realized with a simple structure and without deterioration.

In the embodiment of the present invention, the action of rotating the magnetic head support member 11 and bringing the magnetic head 10 into contact with the magnetic sheet 3 is performed by the attraction force of the attraction type electromagnet 22. A similar effect can be obtained by using a release type permanent magnet composite electromagnet instead. Further, in the above description, a recording-only device was described as an example in which the present invention is applied to an electronic camera, but the present invention may be applied to a reproduction-only device or a device for both recording and reproduction.

[Effects of the present invention]

As explained above, according to the present invention, in magnetic recording and/or reproduction, it is possible to record and/or reproduce high-quality video signals while maintaining the position of the magnetic head with respect to the magnetic sheet with high accuracy, and the apparatus A magnetic sheet device can be realized in which deformation and damage to the magnetic sheet can be prevented even when the magnetic sheet jacket is continuously worn inside the jacket for a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing an example of the device according to the present invention, FIG. 2 is a plan view, FIG. 3 is a plan view showing each part in FIG. 2 in more detail, and FIG.
It is a XX sectional view in a figure. DESCRIPTION OF SYMBOLS 1... Mounting board, 2... Magnetic sheet jacket, 3... Magnetic sheet, 10... Magnetic head, 1
DESCRIPTION OF SYMBOLS 1...Magnetic head support member, 14...Movement guide shaft, 15...Sliding bearing, 16...Support guide shaft,
22... Electromagnet, 23... Adsorption piece of iron.

Claims (1)

[Scope of Claims] 1. A mounting board, a driving means for rotationally driving a magnetic sheet, a magnetic head for recording and/or reproducing information on the magnetic sheet, and the magnetic head is movable in the radial direction of the magnetic sheet. A magnetic sheet device comprising: a magnetic head support member that supports the magnetic head; and a guide member that guides the movement of the magnetic head support member; a second guide shaft fixed to the mounting board at a position opposite to the first guide shaft across the magnetic head, and the magnetic head support member is attached to the first guide shaft. a pressing means for bringing the magnetic head support member and the second guide shaft into contact with each other; A magnetic sheet device comprising: rotation driving means for rotating the magnetic head support member away from the second guide shaft.