JPS59217270A - Magnetic head leading device - Google Patents

Abstract

PURPOSE:To reduce the size and simplify the structure while maintaining the high precision and interchangeability by providing a magnetic head driving means, guide member which moves it linearly, and adjusting means which adjusts the direction of a guide member by rotation. CONSTITUTION:A magnetic head support member 11 is supported on a head movement guide shaft 14 so that a magnetic head is moved linearly, and further supported movably on a support guide shaft 16 for height specification. The shafts 14 and 16 are fixed to a support member 18 and fixed parts 23a and 23b respectively, and the head 10 is moved linearly in parallel at specific height. The support member 18 becomes rotatable around the stop shaft 20 by loosening the stop shaft 20 and a stop screw 21, and fixed to a substrate 1 after being adjusted with an eccentric pin 22 for adjustment. Consequently, a bearing block 17 becomes horizontally movable to and away from the support member 11 and deviation in the parallelism between the shafts 14 and 16 resulting from the position adjustment of the support member 18 is absorbed to smooth and secure the movement of the support member 11.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for magnetically recording still image information and the like by forming a plurality of recording tracks on a magnetic sheet. The present invention relates to a small, accurate, and inexpensive feeding mechanism for a recording or reproducing head that is used in two sets, such as a reproducing device for reproducing and viewing still images.

In recent years, still images have been recorded and played back using a disk-shaped magnetic sheet that is stored in a jacket and used as a cassette-type P2.
Several so-called electronic cameras and playback devices for the same have been proposed. When commercializing this type of device,
In order to create a low-cost product with high portability and operability, a small and simple mechanical configuration is required. On the other hand, in order to record high-quality video signals from multiple screens onto multiple tracks on a small magnetic sheet, it is necessary to increase the density of magnetic recording. In order to maintain compatibility between products so that there will be no problems or performance deterioration even if the magnetic sheets are used interchangeably in multiple products, it is necessary to improve the positioning accuracy of the magnetic head relative to the magnetic sheet during magnetic recording and playback. Furthermore, since the recording wavelength becomes shorter for high-frequency signals such as video signals, the reproduction output decreases due to a difference in the angle of inclination of the gap between the magnetic head with respect to the recording track during recording and reproduction. Consideration must also be given to reducing so-called azimuth loss.

Therefore, for example, a magnetic head feeding device incorporated into an electronic camera and its playback device, etc., is designed to reduce the size and cost of the main body, reduce the size of the mechanism, and at the same time, to maintain compatibility between products and image quality. High precision is required.

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, there is a combination mechanism for linearly moving a magnetic head support member, or a mechanism for installing a magnetic head on a rotating arm member and rotating the head in the radial direction of a recording track. When trying to incorporate a magnetic recording (playback) device using these mechanisms into an electronic camera and its playback device, in the case of using the former mechanism, the motor needs to have rotational angle accuracy to increase head positioning accuracy. In addition, it became necessary to make the winding shaft of the lead screw steel belt with high processing precision, which led to the miniaturization of the equipment,
It becomes difficult to achieve simplification and cost reduction. In addition, when using the latter mechanism, it is easier to make the device smaller and simpler, but because the magnetic head does not move in a straight line at equal pitches, it is difficult to maintain compatibility between products. In addition, 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 accuracy 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 the magnetic head (on the rotating magnetic sheet stored in the jacket), In a magnetic head feeding device that reproduces recorded signals from concentric recording tracks, a magnetic head for moving a magnetic head support member supporting a magnetic head and a nuclear magnetic head support member toward the center of rotation of the rotating magnetic sheet. The magnetic head driving means is equipped with a driving means, a guide member for linearly moving the 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 rotating arm and a guide member for linearly moving the moving arm. and a cam member that regulates the rotation angle, 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 and reproducing device equipped with a magnetic sheet jacket including a head feeding device according to the present invention, and FIG. 2 shows an upper guide plate that regulates the position of the magnetic sheet jacket and the magnetic sheet. 1 is a plan view of a magnetic recording and reproducing apparatus including a head feeding device according to the present invention, with an upper cover member attached thereto removed; FIG.

In FIG. 1, the magnetic sheet 3 in the magnetic sheet jacket 2 supported in parallel to the mounting board 1 has an integrally provided center core 4 that is connected to the drive spindle of the magnetic sheet rotation motor 8. It is inserted and supported by the motor and rotated at a constant speed. 1° is a magnetic head for recording and reproducing signals such as still images, and is attached to a magnetic head support member 11 with screws 12 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 1o. 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 16 of the mounting board 1, and they are supported so as to be parallel and maintain a predetermined distance with the magnetic sheet 6 in between. has been done. moreover,
The lower guide plate 7 is provided with a long hole 7α so that the magnetic head 10 can be moved, and the upper cover member 5 that supports the upper guide plate 6 can be used by replacing the magnetic sheet jacket 2. It is supported by the apparatus main body so as to be movable between an operating position (shown) and a retracted position (not shown) by a known mechanism (not shown).

As shown in FIG. 2, the magnetic head support member 11 supports the magnetic head on the head movement guide shaft 14 via two sliding bearings 15 so as to be movable linearly in the rotation radial direction f of the magnetic sheet 3. has been done. The magnetic head support member 11 further includes a bearing block 17 on a support guide shaft 16 for height regulation.
Similarly, it is movably supported through. The head movement guide shaft 14 and the support guide shaft 16 are connected to the magnetic head 10.
The movement guide shaft support member 18 is precisely machined in order to linearly move the magnetic sheet 3 at a constant height parallel to the magnetic sheet 3.
and is fixed to the support guide shaft fixing parts 26α and 23b with shaft presser plates 19 and 24, respectively.

The support guide shaft fixing parts 23α and 23b are integrated with the mounting board 1, but the movable guide shaft support member 18
When the stop shaft 20 and stop stop 21 are loosened, the mounting board 1
It can be rotated around a stop shaft 20, and after adjustment with an adjustment eccentric pin 22, it is fixed to the mounting board 1 with a stop shaft 20 and a stop stop 21. Therefore,
While the sliding bearing 15 is fixed to the magnetic head support member 11, the bearing block 17 is movable in the horizontal direction between it and the support member 11, and can be moved by adjusting the position of the moving guide shaft support member 18. A slight deviation in parallelism between the head movement guide shaft 14 and the support guide shaft 16 is absorbed to ensure smooth and reliable movement of the magnetic head support member 11. The sliding bearing 15 and the bearing block 17 are made of a material that generates little friction, such as a self-lubricating material, to ensure smooth operation, and the moving guide shaft 14 and support guide are used to improve the positional accuracy of the magnetic head. It is desirable that the fitting clearance with the shaft 16 be minute.

Further, the mechanism of the apparatus according to the present invention is illustrated in FIG. 6, which is a detailed plan view of the embodiment, and FIG. 4, which is a sectional view of the gutter.

As described above, the rectangular bearing block 17 is movable because the boss portion 17α, which projects in a cylindrical shape, fits loosely into the magnetic head support member 11. In order to eliminate play between the support member 11 and the support guide shaft 16 in the vertical direction (direction perpendicular to the magnetic sheet) and to prevent the bearing block 17 from separating from the magnetic head support member 11, the leaf spring 25 presses the spacer 26. It is attached to the support member 11 via the support member 11 . The leaf spring 25 aligns the magnetic head support member 11 with the head movement guide shaft 14 and the support guide shaft 16 to regulate the height in the vertical direction, and at the same time generates an appropriate frictional force between the magnetic head support member 11 and the support guide shaft 16. It operates to attenuate the transmission of the image of the device main body to the magnetic head.

A tension spring 26 is applied to the pin 27 implanted in the magnetic head support member 11, and the tension between the pin 27 and the pin 28 attached to the mounting board causes the head movement guide shaft 14 and the sliding bearing 15 to move. The high precision of the magnetic head 10 is eliminated by eliminating the backlash caused by the very slight gap between Allows positioning.

The magnetic head moving arm 29 has a long bearing 3Q to reduce vibration in the vertical direction (direction perpendicular to the magnetic sheet).
Six rotary rollers are attached to the mounting board 1 by means of a rotary shaft 31 and a rotary shaft 31.A rotary roller 32 is also mounted approximately in the center of the head moving arm 29 and comes into contact with the sagging portion 11α of the magnetic head support member. At the tip (2), rotary roller rollers that come into contact with the head position regulating cam 3'4 are each rotatably attached. Also good.

- 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 65.
, the third gear 38 meshing with the second gear 37 fixedly disposed on the same axis of the ratchet gear 66, and the aforementioned head fitted coaxially with this gear and integrated with the adjusting and fixing screw 39. The head moving arm 29 is attached with a position regulating cam 64, a rotating roller 63 that contacts the head position regulating cam 64, and the head position regulating cam 34 is rotated in a predetermined direction to rotate the head moving arm 29. For this purpose, the ratchet feed pawl 40 is configured to intermittently press the double-stroke portion 36 of the ratchet gear 36. The ratchet feed pawl 40 is rotatably attached to one end 41α of an abbreviated swing link 41,
A guide pin 42 for correctly guiding the feed pawl 40 is installed on the mounting board 1 near the feed pawl 40. The other end 41b of the swing link 41 One end is rotatably connected to 43α.

The other end 43b of this reciprocating link 43 extends so as to come into contact with the eccentric cam 44. The eccentric cam 44 is fixed 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), and the rotation of the drive motor is controlled by the reciprocating movement of the reciprocating link 43. g2 conversion. In the case of a playback device, the shaft 45 may be linked to a dedicated motor for moving the head, or the reciprocating link 43 may be configured to be operated directly by a renoid device. Among them, the other end of a tension spring 46 whose one end is locked to the mounting board 1 is hung in the middle of this reciprocating link 46, and urges the reciprocating link 43 in the direction of the eccentric cam 44. .

At a position near the reciprocating link 43, a ratchet reverse prevention pawl 47 for preventing the ratchet gear 66 from reversing is pivotally attached to the substrate 50 (two rotations) on the feed mechanism. A spring (not shown) is applied to the ratchet portion 66α of the gear 36 so that the engaging portion 47a is always engaged.
A release pin 48 is disposed at a position facing the pressed portion 47b on the opposite side to 7α, and operates to release the engagement between the retaining portion 47α and the two-way joint portion 66α when replacing the magnetic sheet jacket 2. do. That is, when the magnetic sheet jacket 2 is set.

The release pin 48 is in the position shown in FIG.
The ratchet portion 36α is configured to elastically engage with the ratchet portion 36α, but when a jacket detection member (not shown) detects that the magnetic sheet jacket 2 is removed from the apparatus main body for replacement, The release pin 48 moves in the direction of the arrow against the biasing force of the spring to release the pressed portion 47.
6 is pressed so that the anti-reverse claw 47 is brought to a position where it can be rotated counterclockwise. On the other hand, the third gear 38 that is integrally fixed to the head position regulating cam 64 includes:
One end 49α of the reversing spring 49 is applied to bias clockwise rotational force. The other end of this reversing spring 49 is hung on the substrate 5o on the feed mechanism, and is connected between the third gear 38 and the second gear 67 and between the ratchet part 36a of the ratchet gear 36 and the engaging part 47α of the pawl 47. It operates to eliminate play caused by the engagement clearance between the two. Furthermore, reversal spring 4
9 rotates the third gear 68 clockwise and attaches it to the fifth gear when the anti-reverse claw 47 and the ratchet gear 36 are disengaged when the magnetic sheet jacket 2 is replaced and taken out. The pin 38 (X) is moved back to the head feed start position (the state shown in FIG. 6) where the pin 38 (X) contacts the stopper protrusion 50αC of the substrate 50 on the feed mechanism.

Note that the track position indicating pin 52 arranged 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 67 , the fifth gear 38 , and the head position regulating cam 64 . The magnetic head 10 rotates in conjunction with a series of rotational operations to indicate the feeding position of the magnetic head 10. Further, if a counter indicating the number of recorded still images is provided in the magnetic sheet jacket housing, the counter can be advanced in conjunction with the track position indicating pin 5SM2.

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 2 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 is operated and still image information is magnetically recorded by the magnetic head 10 to form an annular recording track on the lower surface of the outermost periphery of the magnetic sheet 3 where the video signal obtained from the imaging device rotates at high speed.

Once the recording operation of the magnetic sheet 6 is completed,
Immediately after that, the drive motor that drives the operation of each mechanism of the camera (for example, the shutter charge, the rear operation of the automatic reflection mirror mechanism in the case of an eye reflex camera, etc.) rotates, and the shaft 45 also rotates in conjunction with this. The axis 45 rotates once (660 degrees) for each screen shot, and rotates 1/2 of the first half.
During rotation (180c'), the reciprocating link 43 moves to the right in the figure due to the compression of the eccentric cam 44. According to this movement, the swing link 41 rotates counterclockwise, and the feed 1.
The claw 40 also moves in the direction of arrow B in the figure. When the feed pawl 40 begins to move in the direction of arrow B, its tip 40α first sinks into the ratchet portion 66a of the ratchet gear 66, and as it moves further, it rotates the ratchet gear 36 by an angle that is more than one ratchet thread but less than two ratchet threads. Rotate in the direction.

Therefore, at the time of reverse rotation, the first claw 47 is connected to the ratchet part 66 next to the first thread.
falls into the valley of After that, the shaft 45 rotates the second half of the rotation (
When the reciprocating link 46 is rotated 180', the reciprocating link 46 returns to the left in the figure, and 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 66 also rotates counterclockwise due to the urging force of the reversing spring 49, but the reversing prevention pawl 47
The engaging portion 47α falls into the trough of the ratchet portion 66α and engages +h, so it stops at position C, which has been moved by exactly one ratchet tooth. In this way, by completing one reciprocating motion of the reciprocating link 43 due to one rotation of the shaft 45,
Send the magnetic head by shooting one screen! This means that seven mechanisms have been moved by one screen. When the ratchet gear 66 rotates clockwise by one ratchet tooth,
In conjunction with this, the second gear 37 and the third gear 38 also rotate clockwise and counterclockwise by one screen, respectively, and the head position regulating cam 34 fixed to the sixth gear 3 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 magnetic head moves by following the counterclockwise rotation of the head position regulating cam 34. Clockwise rotation of moving arm 29 and magnetic head support member 1
1 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. become. The lift amount of the cam surface for each rotation angle 62 of the head position regulating cam 64 is determined by the rotating row 23 attached on the magnetic head moving arm 29 that rotates to follow this.
2 in a direction parallel to the head movement guide axis 14 (i.e.,
If the cam shape is determined so that the movement component in the radial direction of the recording track is constant, the magnetic head support member 11
The amount of feed of the magnetic head 1o fixed to can be made constant for each screen.

As a result, the circular recording tracks of still image information, etc., magnetically recorded on the magnetic sheet can be made to have almost even pitches. Further, as in the embodiment of the present invention, of the two rotating rollers attached to the magnetic head moving arm 29, the rotating roller 3 that comes into contact with the head position regulating cam 34
By configuring the rotation radius around the shaft 31 of the rotary row 232 that contacts the magnetic head support member 11 to be smaller (approximately 172 mm in this embodiment) than the rotation radius around the shaft 31 of the rotary row 232 in contact with the magnetic head support member 11, the head position can be adjusted. Errors in the feed amount of the magnetic head 1o due to manufacturing errors of the regulating cam 34 are reduced.

As described above, the rotation angle of the head position regulating cam is reliably held by the ratchet gear 36 and the anti-reverse claw 47, and at the same time, the play in each part of the head feeding mechanism is eliminated by the tension spring 2.
6 and the reversing spring 49, it is possible to make the linear movement accuracy of the magnetic head 10 very high.

Furthermore, in the embodiment of the present invention, after the end of the photographing operation, the feed pawl 40 of the ratchet gear 3B is moved to a position where it does not come into contact with the ratchet teeth 364 of the ratchet gear 3B until the next photographing operation (until two people are present). The magnetic head feeding mechanism is started by the biasing force of the reversing spring 49, as described above, by removing the magnetic sheet jacket and replacing it regardless of the number of shooting frames except when the camera is in shooting operation. It is constructed so that it can be returned to its position.

Above, we have explained the operation when the device according to the present invention is incorporated into a so-called electronic camera, but the operation when this device is incorporated into a playback device for an electronic camera is also the same except for some operations. belongs to. That is, in the still image reproducing device C2, unlike a camera, the head movement operation is performed not by operating a shutter button but by operating a head movement button that is operated at any time. Therefore, FIGS. 2 and 6 (reciprocating link 4 in a dual feed mechanism)
6 is configured to operate in response to the operation of the head forwarding button 9. Therefore, the eccentric cam 44 is configured to be 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 lunoid that responds to button operation.
The operation of the reciprocating link 43 and below is accomplished in exactly the same way.

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

First, when attaching the magnetic head 10 to the magnetic head support member 11, use the mounting screws 12 so that the gap between the magnetic head 10 and the two sliding bearings 15 is a constant distance and parallel to the axis passing through the two bearings. conclude. Thereafter, the moving guide shaft support member 18 that supports the head moving guide shaft 14 that determines the moving direction of the magnetic head supporting member 11 is
The adjustment eccentric pins 22 are rotated to adjust the rotation by a minute angle around the stop shaft 20. Through this adjustment, it is possible to reduce the torsion error and parallel misalignment error in the angle of the gap of the magnetic head with respect to the center of rotation of the magnetic sheet 3 over the entire movement range of the magnetic head 10 to below the allowable value, so-called unmass loss during recording and reproduction. can be made very small. After the adjustment described above, by tightening the stop shaft 20 and the stop screw 21, the magnetic head 10 can 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 is as described above. With this configuration, the pitches are maintained at equal intervals by the head position regulating cam 34. Therefore, furthermore, the distance i from the coaxial center of the magnetic sheet B of the magnetic head 1o for recording and reproduction is
In order to make the magnetic head 1o have a predetermined value, the head position regulating cam 34 attached to the sixth gear 38 is coaxially adjusted by a small angle and fixed with a set screw 39 to set the movement start position of the magnetic head 1o. Decide precisely. The head position regulating cam 34 is configured with precision fitting to the rotating shaft.
4α is a tool hole for rotation adjustment. With this adjustment,
When recording and reproducing information on annular recording tracks, the movement of the magnetic head 10 not only allows the tracks to be spaced at equal pitches, but also enables highly accurate positioning for the absolute position of each track number (2). .

As described above, according to the present invention, a concentric trunk is formed on a rotating magnetic sheet, or a magnetic head feeding device for reproducing recorded numbers from the concentric track can be made highly accurate, compact, and without using a stepping motor or the like. It can have a simple configuration.

Furthermore, it is possible to make adjustments to ensure the compatibility necessary for electronic cameras and their playback devices, in which the magnetic sheet is housed in a jacket to make a cassette, and the cassette is used interchangeably, that is, to unify the recording format. Because
A magnetic head feeding device suitable for incorporation into an electronic camera and its playback device can be provided.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view of an embodiment of a magnetic recording/reproducing apparatus including a head feeding apparatus according to the present invention, FIG. 2 is a plan view of a magnetic recording/reproducing apparatus including a head feeding apparatus according to the present invention, and FIG. 6 is the same. A detailed plan view of the embodiment, FIG. 4 is a sectional view taken along the line X--X in FIG. 3. 1... Mounting board, 2... Magnetic sheet jacket, 6
...Magnetic sheet, 8...Magnetic sheet rotation motor, 1
0...Magnetic head, 11...Magnetic head support member,
14... Head movement guide shaft, 15... Sliding bearing,
16... Support guide shaft, 17... Bearing block, 1
8...Movement guide shaft support member, 20...Stop shaft, 2
2... Eccentric pin for adjustment, 25... Leaf spring, 26...
・Tension spring, 29...Magnetic head moving arm, 32
．． 33... Rotating roller, 34... Head position regulating cam, 35... First gear, 36... Ratchet gear,
57...2nd gear, Ro8...6th gear, 40...
Ratchet feed pawl, 41... Swing link, 42...
Guide pin, 43... Reciprocating link, 44... Eccentric cam, 47... Ratchet reverse prevention pawl, 48... Release pin, 49... Reverse rotation spring, 51... Counter drive gear, 52... ...Track position indication pin. Agent Patent Attorney Sanro Kimura Figure q + 2 Figures

Claims (3)

[Claims] (1) In a magnetic head feeding device that controls the position of a magnetic head on a rotating magnetic sheet housed in a jacket to form a plurality of concentric recording tracks, or reproduces recorded signals from the concentric recording tracks, a magnetic head support member for supporting a magnetic head; a magnetic head drive means for moving the magnetic head support member toward the center of rotation of the rotating magnetic sheet; and a guide member for making the movement linear. 1. A magnetic head feeding device comprising: adjusting means for rotationally adjusting the direction of the guide member. (2) The magnetic head feeding device according to claim 1, wherein the magnetic head driving means includes a rotary arm and a cam member that regulates the rotation angle of the rotary arm. (3) The magnetic head feeding device according to claim 2, wherein the cam member is attached so as to be adjustable.