JPH1139787A - Turntable device for disk player - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress an abnormal vibration to be generated at the time of the high speed revolution of a mass eccentric disk by arranging plural pieces of ball bearings and liquid whose viscosity is low in a ring shaped formed in a rotation control member integrally rotating with a turntable. SOLUTION: After ball bearings 11 and liquid 12 are put into the groove 10 of a rotation control member 9, the opening part of the groove 10 is covered with a shielding member 13. When, when a disk D is driven with a spindle motor 1, a rotational center and the position of a rotary shaft 2 do not coincide and the rolling action of the disk D is made to be in an imbalance state. As a result, a centrifugal force is exerted on the ball bearings 11 and the liquid 12 being in the groove 10 and they improve the imbalance state and they are moved. Consequently, the rolling action of the disk D by the spindle motor 1 is made to be in a balance state. Thus, even when the disk D has mass eccentricity, since rolling action of the disk is performed with a satisfactory balance, it is made possible to suppress the abnormal vibration from being generated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turntable device on which a disk is placed and which rotates the disk.

[0002]

2. Description of the Related Art Disk players which read signals recorded on a disk using an optical pickup have become widespread. Such a disk player has a turntable on which the disk is placed. . The disc placed on the turntable is fixedly held on the turntable so as to rotate together with the turntable by means called a clamp,
A device utilizing the attraction force of a magnet has been developed as the clamping means. In the technique of performing the clamping operation of the disk by using the attraction force of the magnet, a magnetic material to be attracted by the magnet is provided on the turntable side. Such a turntable is disclosed in Japanese Utility Model Laid-Open No. 21354/1993. Something was done.

[0003] As a disk player, a CD player is generally used, but recently, a CD called a CD-ROM for recording a data signal used by a computer, not a sound signal of music or the like, is reproduced. -Disk players called ROM players are widespread.

[0004]

The CD-ROM player, unlike the CD player that reproduces an audio signal, requires a high-speed reading operation of a signal. 2. Description of the Related Art Disk players configured to perform a signal reading operation by rotating a disk at a high linear velocity such as 6 times, 8 times, and 10 times have been commercialized.

In order to rotationally drive the disk so that the linear velocity becomes constant at a high speed, an expensive spindle motor with good characteristics and a high-precision drive control circuit are required. Disc players have been commercialized that are configured to control the angular velocity not at a constant linear velocity but at a constant angular velocity.

[0006] Among disks used in such a disk player, there is a disk called an eccentric disk whose center of gravity is shifted from the center. When such a disk is rotated at high speed, abnormal vibration occurs. However, there is a problem that abnormal noise is generated.

An object of the present invention is to provide a turntable device for a disk player which solves such a problem.

[0008]

A turntable device according to the present invention has a mounting portion on which a disk is mounted, a center ring portion inserted into a center hole formed in the disk, and a spindle. A turntable fixed to the rotating shaft of the motor, a rotation control member mounted to rotate integrally with the turntable and having a ring-shaped groove formed therein, and formed on the rotation control member. It comprises a plurality of ball bearings provided in the groove so as to be movable along the groove, and a low-viscosity liquid injected into the groove.

[0009]

FIG. 1 is a side sectional view of a main part showing an embodiment of the turntable device of the present invention, and FIG. 2 is a partially cutaway plan view showing the turntable device of the present invention.

In FIG. 1, reference numeral 1 denotes a spindle motor which rotates when supplied with power when reproducing a signal recorded on a disk D. The spindle motor 1 has a rotating shaft 2 and a screw (not shown) on a fixed substrate S. )). Reference numeral 3 denotes a turntable having a mounting portion 4 on which the disk D is mounted and a press-fitting hole 5 for press-fitting the rotary shaft 2 of the spindle motor 1. The turntable 3 is inserted into a center hole formed in the disk D. A center ring portion 6 is formed.

A tapered portion 6A is formed on the upper side surface of the center ring portion 6, and a positioning hole 7 is formed at the center of the upper surface of the center ring portion 6, and the opening is formed in a mortar shape as shown in the figure. Is formed. 8
Is a ring-shaped magnetic body fixed to the center ring portion 6, and is fixed to a mounting portion provided on the center ring portion by an adhesive or the like.

Reference numeral 9 denotes a rotation control member in which a ring-shaped groove 10 is formed. In the groove 10, a plurality of ball bearings 11 are provided, and a low-viscosity liquid 12 such as water is injected. ing. Reference numeral 13 denotes a shield member that covers the opening of the groove 10 formed in the rotation control member 9, and is formed by a thin film-shaped seal.

In such a configuration, the rotation control member 9 is formed of a synthetic resin. After a plurality of ball bearings 11 and a liquid 12 are put in a groove 10 formed in the rotation control member 9, the rotation control member 9 is formed. The rotation control member 9 is assembled by covering the opening of the groove 10 with the shield member 13. By attaching the rotation control member 9 assembled in this way to the lower surface of the turntable 3 with an adhesive, the rotation control member 9 is attached to the turntable 3 so as to rotate integrally with the turntable 3. Can be done.

The press-fit hole 5 formed in the turntable 3 assembled as described above is pressed into the rotary shaft 2 of the spindle motor 1 to fix the turntable 3 to the rotary shaft 2 of the spindle motor 1. I can do it. Further, in such a configuration, the number of the ball bearings 11 housed in the grooves 10 formed in the rotation control member 9 is such that when all the ball bearings 11 are connected, the position of the ball bearings 11 is changed. The angle on the circumference of the circle is set to be less than 180 degrees.

In the turntable device having such a configuration, when the disk D is driven to rotate by the spindle motor 1, the position of the center of rotation does not coincide with the position of the center of rotation, that is, the position of the rotating shaft 2, so that the disk D Is performed in an unbalanced state. As a result, the grooves 10 formed in the rotation control member 9 are
A centrifugal force acts on the ball bearing 11 and the liquid 12 disposed therein to improve the state of imbalance, and the ball bearing 11 and the liquid 12 move to a position corresponding to the degree of imbalance. Become.

As a result of the movement of the ball bearing 11 and the liquid 12 to the position where the unbalanced state is improved, the rotational driving operation of the disk D by the spindle motor 1 is performed in a balanced state. Therefore, even if the disk D is an eccentric disk, the disk D
Can be performed in a well-balanced rotational drive operation,
The occurrence of abnormal vibration can be suppressed.

The illustrated state shows a state in which all the ball bearings 11 are connected, and this state is a case where the position of the center of gravity of the disk D is largely shifted.
That is, in the case of a disc whose center of gravity is not largely displaced, the ball bearing 1 according to the position of the center of gravity of rotation is used.
1 is a complicated positional relationship such as a state where all ball bearings are separated from each other or a state where two ball bearings are in contact with each other.

Also, the groove 1 together with the ball bearing 11
The liquid injected into the cylinder 0 is moved in a direction to improve the unbalanced state by the centrifugal force caused by the rotation, and the moving operation is performed together with the ball bearing 11 to improve the unbalanced state. Done. Since the moving operation of the ball bearing 11 is performed together with the liquid, it is possible to suppress the generation of the sliding noise accompanying the movement of the ball bearing 11.

[0019]

According to the turntable device of the present invention, a plurality of balls are provided in a ring-shaped groove formed in a rotation control member mounted to rotate integrally with a turntable on which a disk is mounted. Since the bearing and the liquid with low viscosity are arranged, even when the position of the center of gravity and the rotation axis do not coincide with each other, such as an eccentric disk, the ball bearing and the liquid are moved to a position where the unbalanced state is improved to balance the liquid. Therefore, the disk can be rotationally driven in a well-balanced state.
Therefore, according to the present invention, it is possible to suppress abnormal vibration that has occurred when the eccentric disk is rotated at high speed, so that it is possible to prevent the generation of abnormal noise and to read signals from the disk. Can be improved.

In addition, according to the present invention, since not only the ball bearing but also the liquid is injected into the groove of the rotation control member, it is possible to suppress the occurrence of sliding noise accompanying the movement of the ball bearing. ing.

Further, according to the present invention, since the opening of the groove formed in the rotation control member is configured to be covered with the shield member, it is possible to prevent the leakage of the liquid at the time of assembling. Can be easily performed.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a main part showing one embodiment of a turntable device of the present invention.

FIG. 2 is a partially cutaway plan view showing the turntable device of the present invention.

[Explanation of symbols]

 D disk 1 spindle motor 2 rotating shaft 3 turntable 4 mounting part 6 centering part 9 rotation control member 10 groove 11 ball bearing 12 liquid 13 shield member

Claims (3)

[Claims] A turntable formed with a mounting portion on which a disk is mounted and a center ring portion inserted into a center hole formed in the disk, and fixed to a rotating shaft of a spindle motor; A rotation control member mounted to rotate integrally with the turntable and having a ring-shaped groove formed therein, and a rotation control member provided in the groove formed in the rotation control member so as to be movable along the groove. A turntable device for a disc player, comprising: a plurality of ball bearings, wherein a low-viscosity liquid is injected into the groove. 2. A ball bearing and a liquid are charged into a groove formed in the rotation control member, and then the opening of the groove is covered with a shield member, and between the upper surface of the opening and the lower surface of the turntable. The turntable device according to claim 1, wherein the rotation control member is attached to the turntable such that the shield member is interposed. 3. The number of ball bearings is set so that when the ball bearings are all connected, the angle on the circumference where the ball bearings are located is less than 180 degrees. 2. The turntable device according to 1.