JPS6346928Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention provides recording or The present invention relates to a rotating magnetic sheet device useful for use in a recording/reproducing device for a rotating recording medium to be reproduced.

The applicant has already developed a novel rotating magnetic head that can record and/or reproduce required still image signals on a magnetic sheet while intermittently moving a magnetic head in the radial direction of a magnetic sheet that rotates at high speed. We are proposing a seat device.

As described above, this type of device magnetically records or reproduces video signals by bringing the magnetic head into sliding contact with a magnetic sheet, so it achieves highly reliable and stable recording and reproduction. In doing so, it is particularly important to obtain stable sliding contact between the magnetic sheet and the magnetic head during high speed rotation.

Therefore, in order to obtain stable sliding contact between the magnetic sheet and the magnetic head, the applicant provided a guide plate in the vicinity of the magnetic head to stabilize the rotation of the magnetic sheet. The guide plate includes a regulating plate having a sheet regulating surface substantially parallel to the sheet guiding surface of the guide plate at a position facing the plate, that is, at a position opposite to the guide plate with the magnetic sheet sandwiched therebetween. A rotating magnetic sheet device has been proposed in which the rotating magnetic sheet device is provided at a predetermined distance from the magnetic sheet.

By the way, in the above-mentioned rotating magnetic sheet device, each opposing surface of the guide plate and the regulating plate is formed of a hard material such as metal. Therefore, the upper and lower sheet surfaces of the flexible magnetic sheet come into contact with the opposing surfaces of the guide plate and the regulating plate at the time of starting rotation, etc., and there is a risk of being damaged by the opposing surfaces. To this end, conventionally, the opposing positions of the guide plate and the regulating plate are set with high precision to prevent damage to the sheet surface of the magnetic sheet. However, this method inevitably has the disadvantage that the cost of the entire device increases because the positions of each guide plate and regulation plate must be set with high precision.

The present invention eliminates these conventional drawbacks and uses a rotating magnet that can prevent damage to the sheet surface of the magnetic sheet even if the installation mechanism of the guide plate and regulation plate is relatively rough. This paper proposes a seat device.

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

FIG. 1 shows a state before a magnetic sheet jacket is attached to a magnetic recording device incorporating a rotating magnetic sheet device according to the present invention.

In FIG. 1, a jacket holder 4 into which a magnetic sheet jacket 3 can be inserted and removed is attached to a mounting board 2 on which a magnetic recording device 1 is mounted so as to be openable and closable via a hinge shaft 5a.
A flexible disk-shaped magnetic sheet 6 is rotatably housed in a jacket housing 5 constituting the outer housing portion of the magnetic sheet jacket 3. Video signals such as image information are magnetically recorded to form a plurality of annular tracks. A window portion 7 is formed in a part of the jacket housing 5.
A portion of the magnetic recording surface 6a of the magnetic sheet 6 is exposed to the outside. One or more (one in this embodiment) magnetic head 8 is inserted into the window 7, and the magnetic head 8 magnetically records a plurality of video signals on the magnetic sheet 6. ing. This magnetic head 6 has a window 7
The magnetic sheet 6 is inserted into the magnetic sheet 6 and moves in the radial direction of the magnetic sheet 6 (for example, from the inner circumferential side position to the outer circumferential side position) every rotation of the magnetic sheet 6.
Video signals are magnetically recorded in a ring on the top.

Further, on the mounting board 2, there is a sheet rotating table 10 on which a reinforcing member 9 provided at the center of rotation of the magnetic sheet 6 is placed, 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 and/or reproducing image information, etc.
, a guide plate 12 for stabilizing the contact state of the magnetic head 8 with the magnetic sheet 6, and a head movement operation section for automatically and intermittently feeding the magnetic head 8 in the radial direction of the magnetic sheet 6. 13
A drive motor 14 and the like for rotationally driving the sheet rotating table 10 and the like are provided.

The magnetic head 8 is attached to the middle part of the moving arm 15 that constitutes the head moving operation section 13.
The head protrusion window 16 formed in the guide plate 12 for stabilizing the contact with the head is viewed from a lower position. A pair of height control pins 17, 17 are installed on this guide plate 12. These pins 17, 17 are provided so as to provide a predetermined distance between the guide plate 12 and a regulating plate 19, which will be described later, provided on the side of the case cover 18 facing thereto.

Note that the movable arm 15 is provided with a spring 2.
One end 20a of the arm 15 is locked, and the movable arm 15 is constantly pulled in the direction of the arrow A in FIG. 1 about the pivot 21.

A fixed shaft 23 that is inserted into the insertion hole 22 on the side of the magnetic sheet jacket 3 is arranged approximately in the center of the mounting board 2, and around this fixed shaft 23, the rotary table 10 rotates. It can be installed freely. A belt 25a is stretched between the rotating table 10 and a belt pulley 25 attached to the drive shaft 14a of the drive motor 14.

Further, the guide plate 12 is inserted into the window portion 7 of the magnetic sheet jacket 3, as shown in FIG.
The purpose of this guide plate 12 is to guide the magnetic sheet 6 inside the sheet jacket 3 so that it rotates in a stable state. It is formed from a plate-shaped horizontal part 27 disposed on the horizontal part 27, and a proximal end block 28 integrally formed at the proximal end of the horizontal part 27.
On the upper end surface, there is a flat opposing surface (hereinafter referred to as a sheet guide surface) 27 for guiding the magnetic sheet 6 so as to be substantially parallel to its rotating surface.
a is formed. This sheet guide surface 27a
This is for regulating the position of the sheet 6 from the bottom side around the head abutting portion where the magnetic head 8 abuts against the magnetic sheet 6. Also,
The buffer member 26 prevents the sheet lower surface 6b including the magnetic recording surface of the magnetic sheet 6 from being damaged by the sheet guide surface 27a of the guide plate 12 when the magnetic sheet 6 starts rotating. At the same time, it is provided for the purpose of reducing the rotational load torque applied during rotation of the magnetic sheet 6 and stabilizing its rotational speed control. As the material for forming the buffer member 26, for example, a fibrous material with relatively high elasticity such as a nonwoven fabric, a porous material, or the like is used.

Further, on the lower surface of the base end block 28, there are guide surfaces 28d, 28d parallel to the sheet guide surface 27a.
are formed, but these guide surfaces 28d, 28
d is a head slider 2 having a magnetic head 8;
The contact sliding portions 29a, 29a on the top surface of both ends of the holder 9 are the portions that come into sliding contact.

The above-mentioned window portion 16 for protruding the magnetic head is formed penetrating approximately the center of the horizontal portion 27 and the buffer member 26 . In order to perform magnetic recording on the magnetic sheet 6, this window portion 16 allows the magnetic head 8 to cover the entire recording track between the innermost track and the outermost track of the sheet 6, as shown in FIG. The opening is provided to allow the head tip of the magnetic head 8 to protrude onto a buffer member 26 disposed on the guide plate 12 for sufficient tracking.

Next, as described above, the head moving operation section 13 moves the magnetic head 8 intermittently in the radial direction of the magnetic sheet 6 while moving the magnetic head 8 over the magnetic sheet 6, for example from the innermost track to the outermost track. This is for tracking operation of the magnetic head 8 so that required information can be magnetically recorded sequentially over different positions. In the illustrated example, the main body is an L-shaped head moving arm 15 rotatably supported by a pivot 21 mounted on the mounting board 2, and the head moving arm 15 is attached to a midway portion of the head moving arm 15. The magnetic head 8 is integrally mounted on the head slider 29 as described above.

The head slider 29 and the head moving arm 1
A pressing means 30 for bringing the magnetic head 8 into contact with the magnetic sheet 6 is arranged between the magnetic head 5 and the magnetic sheet 6. This pressing means 30 is driven in conjunction with the operation of the release operation member, etc., and in this embodiment, it guides the head slider 29 made of a magnetic material and the head slider 29 only in the vertical direction. an electromagnet 32 fixed between each guide pin 31, 31 and on the head moving arm 15; It is composed of a leaf spring 33 interposed between the arm 15 and the arm 15.

On the other hand, the case cover 18 is provided with a regulation plate 19, which is a rectangular sheet regulation plate for regulating the position of the magnetic sheet 6 from the top side, as shown in FIG. The guide plate 12 is formed from a plate-shaped mounting portion 19b integrally formed on the upper surface of the regulating portion 19a.
It is arranged at a position on the side of the case cover 18 facing the case cover 18. Note that, as shown in FIG. 2, the regulating plate 19 is supported by four locking pins 34 erected on the case cover 18 so as to be movable in the axial direction thereof.

Further, a compression spring 35 is interposed between the case cover 18 and the regulating plate 19.
Therefore, due to the elastic force of the compression spring 35, the restriction plate 19 is always elastically biased in the direction of the guide plate 12 along each of the locking pins 34. Note that a guide plate 12 is provided at the tip of the mounting portion 19b.
The spacing adjustment screw 36 that comes into contact with the distal end surface of the fixed shaft 23 described above is screwed onto the distal end of the distal end.

Further, on the lower end surface of the sheet regulating portion 19a constituting the regulating plate 19, a flat opposing surface (hereinafter referred to as a sheet regulating surface) 19 as shown in FIG.
c is formed.

In addition, when the magnetic head 8 is brought into sliding contact with the magnetic sheet 6, a relief portion of the magnetic sheet 6 is formed near the center of the sheet regulating surface 19c at a position facing the magnetic head protrusion window 16. A semicircular concave portion 19d is formed so as to form a groove.

A buffer member 37 is integrally disposed on the entire lower part of the regulating surface 19c. This buffer member 3
7 is also a buffer member 26 provided on the guide plate 12 described above.
It was established for the same purpose.

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

First, when the magnetic sheet jacket 3 is loaded in a predetermined position in the jacket holder 4 and the jacket holder 4 is pushed into the magnetic recording device 1,
A center hole 38 formed in the center of this jacket 3
Through this, the fixed shaft 23 is inserted into the insertion hole 22 of the reinforcing member 9 provided at the center of rotation of the magnetic sheet 6 in the jacket housing 5. At the same time, the buffer member 37 provided on the regulating portion 19a of the regulating plate 29 and the buffer member 26 provided on the horizontal portion 17 of the guide plate 12 are spaced apart from each other by a predetermined distance, and the magnetic sheet jacket 13
are inserted into the window 17 of the window 17, and are opposed to each other within the window 17. Therefore, the upper and lower surfaces 6a and 6b of the magnetic sheet 16 are held between the pair of buffer members 37 and 26 at a predetermined distance.

Next, the magnetic sheet 6 is rotated by rotationally driving the drive motor 14, and when the rotation speed reaches a predetermined value, the pressing means 30 is driven to push the head tip of the magnetic head 8. It is pressed against the magnetic recording surface formed on the lower surface 6b of the magnetic sheet 6. Then, a required video signal is magnetically recorded on the lower surface of the innermost or outermost circumference of the magnetic recording surface so as to form an annular recording track.

In this case, since the magnetic sheet 6 is a flexible sheet, its outer periphery may fluctuate in the vertical direction, for example, at the initial stage of rotation start and at the stage of rotation end, but if such a fluctuation occurs, However, since the buffer members 26 and 37 are provided at the upper part of the guide plate 12 and the lower part of the regulation plate 19, the magnetic sheet 6 is placed on the sheet guide surface 27a of the guide plate 12 and the sheet regulation surface 19c of the regulation plate 19. The upper and lower surfaces 6a and 6b of the seat are cushioned and protected by the pair of cushioning members 37 and 26 without being in direct contact with each other. Therefore, the upper and lower surfaces 6 of the magnetic sheet 6
Damage to parts a and 6b can be prevented.
Furthermore, since each of the buffer members 26 and 37 is made of a material such as a nonwoven fabric, it also contributes to reducing the rotational load torque when the magnetic sheet 6 is rotated.

Further, as described above, the upper and lower surfaces 6a and 6b of the magnetic sheet 6 are connected to the pair of buffer members 37 and 2.
6, and therefore do not come into direct contact with the guide plate 12 and the regulation plate 19. Therefore, the mechanical accuracy of the arrangement relationship (for example, the arrangement interval, etc.) of the guide plate 12 and the regulation plate 19 that constitute the guide regulation mechanism section is reduced. It is possible to reduce the Therefore, the cost of the entire device can be reduced.

By the way, in the above embodiment, the buffer members 26 and 37 are provided on both the guide plate 12 and the regulation plate 19. Even if the buffer member 37 is provided, the above-mentioned problems of the conventional one are solved,
The above objective can be achieved.

As described above, the present invention includes a guide plate that is closely opposed to one surface of the magnetic sheet and disposed near the magnetic head, and a guide plate that is closely opposed to the other surface of the magnetic sheet. and a regulating plate disposed opposite to each other, and a buffering member is disposed on the surface of at least one of the guide plate and the regulating plate facing the magnetic sheet, so that the magnetic sheet is prevented by the buffering member. The sheet surface can be protected and damage can be reliably prevented. Furthermore, since the magnetic sheet surface can be protected by the buffer member, there is no need for high precision in configuring the guide regulation mechanism section consisting of the regulation plate, guide plate, etc. It is also possible to reduce the manufacturing cost.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing a state before a magnetic sheet jacket is attached to a magnetic recording device to which a rotating magnetic sheet device according to the present invention is applied, and Fig. 2 shows the surroundings of a regulating plate and a guide plate constituting the present invention. FIG. 2 is an enlarged sectional view of a main part. 1... Magnetic recording device, 3... Magnetic sheet jacket, 6... Rotating recording medium (magnetic sheet), 8...
...magnetic head, 12... guide plate, 19... regulating plate, 19c... opposing surface of regulating plate (sheet regulating surface),
26, 37...buffer member, 27a... opposing surface of guide plate (sheet guide surface).

Claims (1)

[Scope of utility model registration request] a guide plate that is closely opposed to one surface of the magnetic sheet and disposed near the magnetic head; and a regulation plate that is closely opposed to the other surface of the magnetic sheet and is disposed opposite to the guide plate. Prepare,
A rotating magnetic sheet device comprising a buffer member disposed on a surface of at least one of the guide plate or the regulation plate facing the magnetic sheet.