JPS62273651A - Disc clamping device - Google Patents

Abstract

PURPOSE:To suppress the surface deflection of a disk and to improve the slip stop effect by providing a clamp face keeping the disk horizontally and a slip stop keeping the friction against the disk rotation, individually. CONSTITUTION:A ring slot 14 having the same turning center as that of a turntable 1' of a disk clamper is formed and a slip stop Z' made of a rubber member such as a foamed urethane or chloroprene having a narrower width than the slot width is projected from the clamp face 13 and pressed to the bottom of the slot 14. In depressing a disk 5 to be clamped onto the table 1' by a clamp spring 8, the slip stop Z' is deformed and stored in the slot 14. Only the clamp face 13 is adhered to the disk 5 in such a state and the disk 5 is held horizontally and a strong friction force is delivered to the disk 5 to suppress the face deflection of the disk 5.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a disc clamping device for a disc drive device, such as a compact disc, an optical disc, or a cartridge disc.

(Prior Art) FIG. 3 is a half-sectional view showing the structure of a conventional disk clamp device. In fig.

1 is a turntable, which has a non-slip member 2 bonded to it;
It is rotationally driven by a motor shaft 3. 4 is a centering piece for perfectly aligning the center of rotation of the disk with the center of the motor shaft 3; 5 is a clamped disk; the turntable 1 is guided by the slide 6 and the centering piece 4;
After being placed on the clamp spring 8 via the clamper 7
is pressed against the anti-slip 2. Further, the clamper holder 9 is connected to the magnet 11 by the magnet lO.
12 is a centering spring, and 13 is a disk clamping surface (hereinafter simply referred to as a clamping surface).

This type of disk clamp device first uses a disk 5.
is positioned at the center of the motor shaft 3 by the centering piece 4 and pressed against the turntable 1 by the clamp spring 8 in order to transmit one rotation driving force. At this time, it is necessary to transmit a large torque to the disk 5 in order to shorten the start/stop time of the drive motor, and the turntable 1
A non-slip member 2 made of a friction member such as rubber is adhered to the surface of the slider.

(Problems to be solved by the invention) The conventional disk clamp device formed in this way is
The use of the anti-slip 2 to obtain a large frictional force with the disk 5 substantially deteriorates the machining accuracy of the clamping surface 13,
Therefore, there is a drawback that surface runout of the disk 5 cannot be avoided during rotational driving.

The present invention aims to eliminate the drawbacks of the conventional disk clamp device as described above, and provides a disk clamp device that almost completely suppresses surface runout.

(Means for Solving the Problems) The present invention achieves the above object by providing an annular groove centered on the rotation center of the turntable on the clamping surface of the turntable of a disc clamping device, and A rubber material such as foamed urethane or chloroprene with a width slightly narrower than the groove width is used to prevent slipping, and is placed higher than the groove (height and depth) and protrudes beyond the clamping surface of the turntable to prevent slipping due to the rubber material. This is accomplished by deforming the stop and pressing the disk against the clamp surface to hold it horizontally, suppressing surface runout, and ensuring the frictional force applied to the disk.

(Function) The present invention suppresses surface run-out of the disk by separately providing a clamping surface that maintains the disk horizontally and a non-slip surface that maintains a frictional force that resists the rotation of the disk. At the same time, it is possible to ensure a great anti-slip effect.

(Example) Hereinafter, the present invention will be explained in detail by way of an example using the drawings. FIG. 1 is a half-sectional view showing the configuration of a disk clamping device according to an embodiment of the present invention, and FIG. 2 is an enlarged view of the main parts of FIG. 1. Hereinafter, unexplained symbols are the same as those in FIG. It refers to something.

In both figures, 1' is a turntable, and an annular groove 14 is formed around the rotation center of the turntable.

A non-slip 2' made of a rubber material such as urethane foam or chloroprene, which is slightly narrower than the groove width and has a width of about 80% of the groove width, is about 2 m or 2 m higher than the groove height (depth).
It is bonded to the bottom of the groove so as to protrude beyond the clamp surface 13 of the turntable 1', and the other configurations are the same as in FIG. 3. That is, the centering piece 4 moves up and down guided by the motor shaft 3, and a centering spring 12 pushes up the slide 6, which is screwed to the motor shaft 3 by a magnetic attachment 11. The disk 5 to be clamped is pressed against the clamp surface 13 of the turntable 1' by a clamp spring 8 via a clamper 7.

Further, the magnet 10 fixes the clamper holder 9 to the magnetic attachment 11.

Since the present invention has such a configuration, the disk 5 is pressed against the clamp surface 13 of the turntable 1' by the clamper 7, and at this time, the disk 5 is made of foamed rubber that deforms with a force smaller than the force with which the clamper 7 is pressed. Prevents materials from slipping 2'
If the material is selected, horizontal holding of the disk 5 and surface runout are determined only by the accuracy of the clamping surface 13. Therefore, if the clamping surface 13 is made of a material that can be easily machined with high precision, such as metal, it becomes possible to suppress the surface runout of the disk 5 to an extremely small level. ', it is possible to secure a friction force that is 5 to 10 times greater than when the disk 5 is supported only by the metal clamping surface 13, and it is extremely effective even when large torques for starting and stopping the rjjA drive motor are transmitted to the disk 5. This allows for small slippage.

(Effect of the invention) As is clear from the above description, according to the present invention.

(1) If the turntable in contact with the disk is made of metal or the like with good workability and a clamping surface is formed, surface runout of the disk can be easily suppressed, and (2)
)1 Since a turntable with a ring-shaped non-slip layer made of foam material is used, compared to a case where only a metal surface is used,
It has the effect of increasing the frictional force with the disk by 5 to 10 times. Therefore, great effects can be obtained if applied to various floppy disk devices that have recently become popular.

[Brief explanation of drawings]

FIG. 1 is a half-sectional view of a disc clamping device according to an embodiment of the present invention, FIG. 2 is an enlarged view of the main part thereof, and FIG. 3 is a half-sectional view of a conventional disc clamping device. 1.1'... Turntable, 2.2'... Anti-slip, 3... Motor shaft, 4... Centering piece, 5... Disc, 6... Slide, 7.
... Clamper, 8... Clamp spring, 9...
Clamper holder, 10... Magnet, 11...
Magnet attachment, 12... Centering spring, 13.
...Disc clamp surface, 14... annular groove. Fig. 1 7゛° Clamp t (8-Clamp Spring 9°°゛ Clasiva Main Luk゛ 10... Mag Kit 13... De'4 or 7 Flang ta
+4・-4 tripping number number 2

Claims (1)

[Claims] In a disk drive device, a turntable on which a disk is fixedly placed and rotated is formed as a flat surface with an annular groove that can hold the disk horizontally, and the bottom of the annular groove has a surface that is deeper than the depth of the annular groove. A non-slip material made of a foam material with a high height is glued to the surface, and when the disc to be clamped is pressed against the turntable, the non-slip material is deformed and accommodated in the annular groove, so that only the flat surface is attached to the disc. A disk clamping device characterized in that the disk is held horizontally by close contact and a strong frictional force is transmitted to the disk.