JPS5894164A - Magnetic recorder and reproducer - Google Patents

Abstract

PURPOSE:To perform stable recording and reproduction for information signals, by bringing a magnetic head into contact with a recording plane of a rotating magnetic sheet surely. CONSTITUTION:In turning off a release operating member (not shown) serving as a recording operation switch, a head slider 29 is attracted downward with an electromagnet 53, a magnetic head (not shown) is detached from a magnetic recording plane 6b of a sheet 6, and in turning on the member, the slider 29 is moved upward with a plate spring 33 and the magnetic head is in contact with the magnetic recording plane 6b. Further, at a lower side 41A of a sheet supporting block 41, a sheet supporting pad 43 made, e.g., of felt is stuck to a part opposing to a sheet slide plane 8A of the magnetic head. The magnetic recording plane 6b of the pad 43 is pressed on a sheet slide plane 8A with a coil spring 45.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording and reproducing apparatus that records and/or reproduces information signals such as still images using a magnetic head that is moved in the radial direction of a rotating magnetic sheet.

The applicant has already developed a novel magnetic field in which a magnetic head is intermittently moved in the radial direction of a rotating magnetic sheet that rotates at high speed, and a required still image signal, etc. is recorded and/or reproduced on the magnetic sheet. We are proposing a recording/playback device.

In this type of device, as mentioned above, the magnetic head slides into contact with the magnetic recording surface of the magnetic sheet to magnetically record or reproduce video signals, so it is highly reliable and stable recording and reproduction. In achieving this, it is particularly important to obtain stable sliding contact between the magnetic sheet and the magnetic head during high-speed rotation.

By the way, since the above-mentioned sheet is formed in an extremely thin sheet shape, there is a possibility that the portion of the sheet in sliding contact with the head may fluctuate in the vertical direction, especially at the initial stage of rotation start and the stage of rotation end. Yes. If the sheet moves as described above during recording or playback and escapes to the other side opposite to the head position, stable recording or playback of image signals, etc. cannot be performed. It's extremely inconvenient.

The present invention was proposed in view of the above circumstances, and it is possible to stably record and/or reproduce information signals by bringing a magnetic head into reliable contact with the recording surface of a rotating magnetic sheet. The purpose is to do so.

Hereinafter, one embodiment of the present invention will be specifically described based on the drawings.

FIG. 1 is a perspective view showing the main parts of a magnetic recording device according to the present invention, showing the state before a magnetic sheet jacket is loaded into the device, and FIG. 2 is a diagram showing the state after loading the jacket into the device. FIG. In this magnetic recording device 1, a base plate 2 on which a magnetic heald 8 is arranged has a structure in which a magnetic sheet jacket 3 can be inserted and removed.
A case cover 4 having a jacket holder 4a is attached by a hinge member 5 so as to be openable and closable.

Inside the jacket housing 5 constituting the outer housing portion of the magnetic sheet jacket 3, a rotating fast air sheet 6 formed into a disk shape by an extremely thin sheet is rotatably housed. For example, video signals such as still image information are magnetically recorded to form a plurality of annular tracks. A window 7 is formed in a part of the jacket housing 5, and the magnetic sheet 6
A part of the magnetic recording surface 6b is exposed to the outside. One or more (one in this embodiment) magnetic heald 8 is inserted into the window 7, and this magnetic heald 8 is inserted into the window 7.
Accordingly, a plurality of video signals are magnetically recorded on the magnetic recording surface 6b of the magnetic sheet 6. This magnetic head 8
is inserted into the window 7 and extends the magnetic sheet 6 in the radial direction of the magnetic sheet 6 (for example, from the inner circumferential side position to the outer circumferential side position).
The image signal is moved every rotation of the magnetic sheet 6, and a video signal is magnetically recorded on the magnetic sheet 6 each time.

Further, on the base plate 2, there is also a sheet rotary table 10 on which a reinforcing member 9 provided at the center of rotation of the magnetic sheet 6 is placed under suction, and a sheet rotating table 10 that is stationary, for example, with respect to the magnetic sheet 6 in the magnetic sheet jacket 3. The magnetic head 8 for recording image information, etc., a head moving operation unit 13 for automatically and intermittently feeding the magnetic head 8 in the radial direction of the magnetic sheet 6, a sheet rotating table 10, etc. A driving motor 14 and the like for rotational driving are provided.

Note that the motor 14 is provided with a servo for controlling the rotational phase and rotational speed of the seat 6 in order to rotate the seat 6 at a constant speed at a predetermined rotational phase.

The magnetic head 8 has the head movement operation unit 13 configured so as to face the magnetic recording surface 6b of the sheet 6 through a head protrusion window 16 formed in the lower substrate 12 fixed to the base plate 2. The head moving arm 15 is disposed in the middle of the head moving arm 15.

One end 20a of a tension carp JL/spring 20 is locked to the head moving arm 15, and this head moving arm 15 is always resiliently biased in the direction of the arrow in the figure of the cylinder 1 about the pivot 21. has been done.

Approximately in the center of the base plate 2 is a positioning fixed shaft 2 that fits into the shaft insertion hole 22 on the side of the magnetic sheet jacket 3.
3 is arranged, and the rotary table 10 is rotatably attached around this fixed shaft 23. A bell 25a is provided between the rotary table 10 and a belt pulley 25 attached to the drive shaft 14a of the drive motor 14.

The lower substrate 12 has a plate-shaped horizontal portion 2 as shown in FIG.
7 and a proximal end block 28 integrally formed at the proximal end thereof. A guide surface 28d parallel to the magnetic recording surface 6b of the sheet 6 is formed on the lower surface of the base end block 2B. The upper surfaces of both ends of the head slider 29, which supports the magnetic head 8, are stopped by the guide surface 28d so as to be slidable.

The above-described window portion 16 for protruding the magnetic head is formed penetrating approximately at the center of the horizontal portion 27 . This window portion 16 is provided so that the magnetic head 8 can sufficiently track the entire recording track between the innermost track and the outermost track of the sheet 6 for magnetic recording on the magnetic sheet 6. , an opening is provided to allow the head chip of the magnetic helad 8 to protrude above the lower substrate 12 .

As described above, the head moving operation section 13 moves the magnetic head 8 from the innermost track to the outermost track on the S air sheet 6 while intermittently moving the magnetic head 8 in the radial direction of the magnetic sheet 6. This is for tracking operation of the magnetic radar 8 so that required video signals can be sequentially magnetically recorded over the positions. In the illustrated example, the main body is an L-shaped head moving arm 15 that is rotatably supported by a pivot 21 installed on the base plate 2, and the head moving arm 15 is As mentioned above, the magnetic helad 8 is integrally attached on the helad slider 29 attached to the section.

A pressing means 30 for bringing the magnetic helad 8 into contact with the magnetic sheet 6 is disposed between the helad slider 29 and the head moving arm 15.

This pressing means 30 is driven in conjunction with the operation of a release operation member serving as a recording operation switch, and in this embodiment, it moves the head slider 29 and the head slider 29 made of a magnetic material up and down. An electromagnet 32 is fixed to the head moving arm 15 between the id pin 31.31 and each of these guide pins 31.31, and a rad slider is attached to the above so as to cover the upper part of the electromagnet 32. 29 and head moving arm 15
and a leaf spring 33 interposed between the two. That is, when the release operation member is turned OFF, the f1 head slider 29 is attracted downward by the electromagnet 3, the magnetic head 8 is separated from the magnetic recording surface 6b of the sheet 6, and the release operation member is turned ON. Then, the head slider 29 is moved upward by the spring force of the plate spring 33, and the magnetic head 8 is moved toward the sheet 6.
The magnetic recording surface 6b is brought into contact with the magnetic recording surface 6b.

On the other hand, on the back side of the case cover 4, the cover 4
An upper substrate 19 is provided at a position facing the lower substrate 12 when the lid is closed. The upper board 19 is slid into a second position by an id pin 34 and a compression coil spring 35.
It is attached to the case cummer 4 so as to be movable in the vertical direction in the figure. The upper substrate 19 also includes a height position in the vertical direction of the substrate 19 and a height position of the lower substrate 12.
Two spacing adjustment screws 36 for adjusting the inclination to
．． 36 are provided. The tips 36a, 36a of each of these screws 36.degree. 36 abut on position regulating pins 37, 37 erected on the lower substrate 12, and are stopped. Further, the tip m19a of the upper substrate 19 protrudes to a position ahead of the lower substrate 19 (a position on the drive motor 14 side), and the tip m19a has the fixed shaft 2.
A spacing adjustment screw 38 is provided which comes into contact with the tip end surface of 3. Note that a sheet rotation position detection coil 39 is provided at the tip end 19a of the upper substrate 19.

On the other hand, in the upper substrate 19, a rectangular opening 4 is provided at a portion facing the heald 8 with the sheet 6 therebetween.
0 is formed. As shown in FIG. 3, a seat support block 41 is rotatably mounted in the opening 40 by a hinge pin 42. As shown in FIG. As shown in FIGS. 4 and 5, the lower surface 41A of the block 41
In this case, a sheet supporting pad 43 made of felt, for example, is attached to a portion of the head 8 facing the sheet sliding contact surface 8A via a sealing material 44 containing permalloy so as to cover the head movement area.

The block 41 has a coil portion 45a fitted into the hinge pin 42, and one end 45a is locked to the upper surface 19A of the upper substrate 19, and the other end 45C is locked to the upper surface 41B of the block 41. It is always biased by a torsion coil spring 45 to rotate counterclockwise in FIG.

Therefore, the pad 43 is resiliently biased in the direction of the magnetic head 8 by the spring force of the coil spring 45, and the magnetic recording surface 6b of the magnetic sheet 6 disposed between the pad 43 and the head 8. can be pressed against the sheet sliding surface 8A of the head 8. The radial inclination and circumferential inclination of the pad 43 with respect to the seat 6 can be adjusted by the three spacing adjustment screws 36, 36, 38, and the pressing surface 43 of the pad 43
It can be supported so that A is always parallel to the 6th surface of the sheet. Further, the block 41 is stopped at a predetermined position by a stopper locking piece 46 protruding from the tip 41a of the block 41 coming into contact with a stepped portion 47 formed on the upper substrate 19. Therefore, when the case cover 4 is raised from the base plate 2 in order to remove the jacket 3 from the recording apparatus 1, the block 41 can be held so as not to separate from the upper substrate 19.

In addition, in the seat support block 41, a suction plate 50 formed of a magnetic material is attached to the lower surfaces 48A and 49A of the side plate portions 48 and 49 into which the hinge pin 42 is inserted by means of set screws 51 and 51. Both side plate parts 48.
It is constructed and fixed between 49 spaces. An electromagnet 52 is disposed above the suction plate 50. This electromagnet 52
As shown in FIG. 6, the upper surface 1 of the upper substrate 19 is
The attachment whose one end 54a is fixed to 9A with a set screw 53 is positioned and fixed to the other end 54b of the plate 54.

The electromagnet 52 is for releasing the suppressing action of the pad 43 on the sheet 6 in connection with the operation of the release operation member, and
When the FF operation is being performed, the suction plate 50 is sucked, the block 41 is rotated clockwise in FIG. 6, the pad 43 is lifted off the upper surface 6a of the seat 6, and the release operation member is turned on. and the above suction plate 50
It is configured to release the suction operation of.

Therefore, the magnetic recording surface 6b of the sheet 6 is brought into contact with the sheet sliding surface 8 of the head 8 by the pad 43 only during recording.
It is configured to be pressed against A. That is, the sheet 6 is configured to be pressed against the pad 8 only when necessary, and the sheet 6 is pressed against the pad 43 only when necessary.
Permanent deformation of the signal can be prevented, and signal dropout can be prevented. Note that a keep solenoid plunger may be used as the separation operation device for the pad 43 with respect to the sheet 6.

Further, if the pad 43 is made of conductive carbon fiber, and the seat support block 41, hinge pin 42, and upper substrate 19 are made of a metal material, when the seat 6 is rotated, Generation of static electricity due to the pad 43 slidingly contacting the upper surface of the sheet 6 can be prevented.

Although the above embodiment has been described as having only a recording function, the present invention may also be a device having only a playback function, or even a device having both recording and playback functions. It is self-evident that this is a good thing.

As described above, the present invention provides a magnetic recording/reproducing device that uses a rotating magnetic sheet as a recording medium, in which a sheet support pad is provided to cover a head movement area at a position facing the sheet sliding contact surface of a magnetic head, with the sheet interposed therebetween. The magnetic head can be brought into reliable contact with the magnetic recording surface of the sheet, and information signals can be stably recorded and/or reproduced.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the main parts of a magnetic recording device showing one embodiment of the present invention, Fig. 2 is an enlarged sectional view of the main parts, Fig. 3 is an enlarged bottom view of the upper substrate, and Fig. 4 is a sheet support. FIG. 5 is an enlarged longitudinal side view of the block, FIG. 5 is an enlarged bottom view of the block, and FIG. 6 is an enlarged longitudinal side view of the upper substrate. 1... Magnetic recording device 6... Rotating magnetic sheet 8
...Magnetic head 8A...Seat sliding contact surface ゛4
3... Patent application for seat support pad - Person Sony Corporation Representative Patent Attorney Kodo Koike 1) Sakae Mura -

Claims (3)

[Claims] (1) In a magnetic recording/reproducing device using a rotating magnetic sheet as a recording medium, a sheet support pad is provided to cover the head movement area at a position facing the sheet sliding surface of the magnetic head, with the sheet interposed therebetween. Features of magnetic recording and reproducing device. (2) The pad is supported so as to elastically protrude in the head direction, and the magnetic recording surface of the sheet is in pressure contact with the sheet sliding surface of the head. The magnetic recording/reproducing device according to item (1). (3) The pad is supported so as to elastically protrude toward the head only during recording or reproduction, and the magnetic recording surface of the sheet is separated from the sheet sliding surface of the head under normal conditions. Claim No. (1)
The magnetic recording and reproducing device described in 2.