JPH0546028B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a turntable device for a disc in a player that uses a disc for recording and reproducing signals.

Conventional Structures and Their Problems In recent years, the use of disks for magnetically or optically recording and reproducing signals has been remarkable. In players using such disks, signals are often detected from the bottom side of the disk mounted on the turntable, and the turntable can only be made with a relatively small diameter. On the other hand, since signal detection accuracy is required, high accuracy is required to minimize vertical vibrations around the outer periphery of the disk. Furthermore, since the turntable has a small diameter, several times higher precision is required for the vertical vibration of the turntable.

FIG. 1 shows a conventional example. In FIG. 1, reference numeral 1 denotes a substrate to which a bearing 2 is fixed. A motor shaft 4 is supported at the center of bearing metals 3, 3 provided in this bearing 2.
A motor rotor 5 is fixed to the lower end of the motor rotor 5, and is driven and rotated by an opposing motor drive coil 6. A thrust bearing 8 is fixed to the stator 7 that supports the motor drive coil 6. 9
is an optical pickup for picking up signals, and 10 is its lens. The optical pickup 9 is the substrate 1
The disk is moved in the radial direction using a shaft 11 fixed to the disk as a guide. A turntable 12 is made of a magnetic material and is fixed to the motor shaft 4 with a set screw 13. Reference numeral 14 denotes a centering ring, which is supported so as to be movable up and down with the motor shaft as a guide.
Pushed by the spring 15, the tapered portion 14a at the tip enters the center hole 17a of the disk 17 for centering. 16 is a retaining ring for the centering ring 14. On the other hand, clamper magnet 18
is fixed to the yoke 19. magnet 18
is attracted to the turntable 12 and clamps the disc 17. The clamper 20 and the yoke 19 are fixed to each other. Reference numeral 21 denotes a clamper support, which is separated from the clamper 20 during performance, but is used to pull the clamper 20 away from the turntable 12.

However, in the conventional turntable device described above, since high accuracy is required for the vertical vibration of the turntable 12, the turntable 12 is
It is manufactured by cutting a metal rod using a high-precision processing machine, and has the disadvantage that processing is difficult and expensive.

Purpose of the invention The present invention solves the above-mentioned conventional problems.
It is an object of the present invention to provide a turntable device for a disk that has a simple configuration, is inexpensive, and has good productivity.

Structure of the Invention In order to achieve the above-mentioned object, the turntable device of the present invention press-works a metal plate to provide a mounting part to the motor shaft in the center part, and has a flat part perpendicular to the motor shaft in the outer peripheral part. The device is characterized in that it has a main body portion provided with a flat plate portion, and a soft material such as rubber or resin is provided on the surface of the flat plate portion constituting the main body portion. According to this configuration, the main body can be made of a metal plate with good workability, and by processing the soft material formed on the surface of the flat plate on the outer periphery of the main body using the attachment part to the motor shaft. This has the advantage that a turntable with good runout accuracy can be manufactured.

DESCRIPTION OF THE EMBODIMENT FIG. 2 shows an embodiment of the present invention. In FIG. 2, the structure other than the structure of the turntable is the same as that of the conventional example, so a description thereof will be omitted here. In FIG. 2, 22 is a turntable main body, and a boss 23 is provided at the central mounting part of this main body 22.
is fixed, and the screw 1 to be tightened into this boss 23
3 to the motor shaft 4. There is a flat plate part perpendicular to the motor shaft 4 on the outer periphery of the main body part 22, and a soft material 24 such as rubber or resin is fixedly formed on the surface of this flat plate part.

Here, the main body part 22 is made of a soft material in order to absorb the vertical vibration of the flat plate part on the outer periphery of the main body part 22 obtained by pressing a magnetic metal plate.
4 is provided. The soft material 24 is provided with a boss 23 at the center attachment part of the main body part 22, and is formed to have a thickness greater than the vertical swing width of the flat plate part when rotated around the boss 23. The surface of the soft material 24 is shaved and polished. Therefore, when the turntable processed in this manner is fastened to the motor shaft 4 with the screws 13, the vertical vibration of the upper surface of the soft material 24 with respect to the motor shaft 4 becomes highly accurate.

In addition, in the above embodiment, the disc is clamped using the suction force of the magnet, but when the disc is clamped using the elastic force of the spring, the tightening force of the screw, etc., the main body part is not attached. It may also be configured by pressing a magnetic metal plate. In this way, since the non-magnetic metal plate has good workability, productivity can be further improved.

Effects of the Invention As described above in detail, according to the present invention, a flat plate portion is provided on the outer peripheral portion of the main body portion provided with the recessed portion in the center portion,
Since a soft material is provided on the surface of this flat plate part, the main body part can be constructed by pressing a metal plate.
Further, the soft material formed on the flat plate portion of the outer peripheral portion can be processed mainly around the attachment portion. This makes it possible to realize a turntable with high productivity, low cost, and high precision.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of a conventional turntable device.
FIG. 2 is a sectional view of a turntable device showing an embodiment of the present invention. 4...Motor shaft, 22...Main body, 23
...boss, 13...screw, 24...soft material.

Claims (1)

[Claims] 1. A main body formed by press forming a metal plate and having a central part provided with an attachment part to the motor shaft, and a flat plate part provided on the outer periphery so as to have a flat part perpendicular to the motor shaft, and the main body part A soft material such as rubber or resin that is thicker than the vertical vibration width of the turntable when the motor rotates is formed on the surface of the flat plate part constituting the motor, and is machined and polished to eliminate vertical vibration of the turntable. A disc turntable device characterized by: