JPH05151675A - Disk holding device - Google Patents

Abstract

PURPOSE:To facilitate the attaching work of a ball in a disk holding device providing a ball holder housing plural balls applied by pressing force from a center to a peripheral direction on a turntable, inserting the center hole of the disk into the ball holder and holding the disk on the turntable. CONSTITUTION:This device is provided with a window part 4 formed on the outer peripheral wall surface of a ball holder 3 and from which a part of the ball projects, a spring 5 with a smaller diameter than a ball 6 for applying the pressing force to the ball 6 and a setting groove 8 formed on the rear surface of the ball holder 3 from the center facing respectively to respective window parts 4. The setting groove 8 is constituted of a wide width part 8a having a wider width than the diameter of the ball 6 and a narrow width part 8b having a narrow width than the diameter of the ball and the width corresponding to the diameter of the spring 5, and simultaneously, the forming range of the wide width 8a is regarded as by one piece of the ball from the wall surface where the window part 4 is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc holding device for holding a disc on a turntable.

[0002]

2. Description of the Related Art There is known an optical disk device which optically reads a signal recorded on a disk or writes a signal on the disk by using an optical pickup. In such an optical disc device, since the disc is normally rotated at a high speed, a disc holding device for holding the disc on the turntable is required.

As a typical optical disc device, a CD player is well known. As a CD player, a headphone stereo type portable CD player, which is worn on the body and listens to reproduced sound using headphones, is known. is there. In this type of CD player, thinning is one of the most important factors, and for this reason, it is necessary to thin the disc holding device.

In order to achieve a thin disk holding device, a plurality of balls to which a biasing force is applied in the outer peripheral direction from the center are partially projected in the prior art, for example, as disclosed in Japanese Patent Laid-Open No. 3-157859. There is known a disk holding device in which a ball holder housed in a closed state is provided on a turntable, and a center hole of the disk is inserted into the ball holder to hold the disk on the turntable by the ball. There is.

[0005]

By the way, in the disk holding device of the above-mentioned type, conventionally, the balls had to be manually placed one by one at a predetermined position of the ball holder, and there was a problem in workability.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has a window portion formed on an outer peripheral wall surface of a ball holder, through which a part of the ball projects, and an urging force for the ball. A spring having a diameter smaller than that of the ball for applying the electric field, and an installation groove formed on the back surface of the ball holder for installing the ball and the spring from the center toward each window portion. It is composed of a wider part having a wider width and a narrower part having a width corresponding to the diameter of the spring, and the forming range of the wide part is one ball from the wall surface provided with the window.

[0007]

According to the present invention, in the installation groove for installing the ball and the spring of the ball holder, a wide portion having a width wider than the diameter of the ball and a narrow portion having a width smaller than the diameter of the spring corresponding to the diameter of the spring are provided. In addition to providing the wide portion, the forming range of the wide portion is set for one ball from the wall surface provided with the window portion, so that the ball holder is put into a container having a large number of balls and the balls are scooped. The balls are automatically arranged one by one at the predetermined position.

[0008]

1 is a plan view showing an embodiment of the present invention, FIG.
Is a side view thereof.

In the figure, 1 is a spindle motor, 2 is a rotary shaft 1a of the spindle motor 1, and a turntable main body on which a disc is mounted is fixedly mounted.
Is a ball holder that is mounted on the turntable body 2 and into which the center hole of the disc is inserted.

The ball holder 3 has three window portions 4 formed on the outer peripheral wall surface at an angle of 120 degrees from the center and equally divided into three portions. A spring 5 applies an urging force from the center to the outer peripheral direction. The three applied balls 6 are held in a state of partially protruding from the window portion 4 due to the width of the frontage of the window portion 4.

FIG. 3 is a sectional view showing a section from the center of the portion where the balls 6 are arranged. As shown in FIG. 3, the spring 5 used has a diameter smaller than that of the balls 6 and is wound. One end is supported by the inner wall of the center of the ball holder 3, and the other end directly supports the ball 6. Therefore, the ball 6 is rotatably supported with the biasing force applied by the spring 5.

Therefore, when the disk 7 is set on the turntable body 2, when the edge portion of the center hole of the disk 7 is brought into contact with each ball 6 of the ball holder 3,
The center hole of the disk 7 can be smoothly inserted into the ball holder 3 by pressing the ball 6 in the central direction while rotating.

On the other hand, the disk 7 is attached to the turntable body 2
The disk 7 can be smoothly pulled out from the ball holder 3 by the rotation of the ball 6 even when it is removed from the ball holder 3.

By the way, as shown in FIG. 4 showing the back surface of the ball holder 3, installation grooves 8 for installing the springs 5 and the balls 6 are formed on the back surface of the ball holder 3 from the center toward the respective window portions 4. ing. The installation groove 8 has a smaller allowable width than the diameter of the ball 6, a wide portion 8a formed on the outer peripheral side, and a width smaller than the diameter of the ball 6, and a narrow width on the inner peripheral side of the width corresponding to the diameter of the sub ring. And part 8b. The wide portion 8a is formed within the range of one ball 6 from the wall surface provided with the window portion 4. Therefore, when the balls 6 are set in the ball holder 3, the ball holder 3 is put into a container (not shown) in which a large number of balls 6 are placed, and the balls 6 are scooped. The balls 6 are automatically inserted one by one into the wide portion 8a of the installation groove 8 .

The term "one ball 6 from the wall surface in the forming range of the wide portion 8a" means the range in which one ball 6 can be inserted, as shown by the alternate long and short dash line in FIG. Including those shorter than the diameter.

Here, the wide portion 8a has a groove depth deeper than that of the narrow portion 8b. Therefore, when the ball holder 3 is placed on the back side, the ball 6 inserted in the wide portion 8a naturally rolls to the position shown by the chain double-dashed line in FIG. 4, and a part thereof is projected from the window portion 4. Is located in.

In this state, when the spring 5 is compressed and inserted into the narrow portion 8b, the spring 5 and the ball 6 are held by the ball holder 3 by the urging force of the spring 5.

The ball holder 3 holding the spring 5 and the ball 6 is attached to the turntable body 2 such that the center hole 3a is inserted into the center axis 2a of the turntable body 2. Is provided with a concentric mounting groove 9 having a smaller diameter than the outer circumference of the ball holder 3, and the ball holder 3 is provided with a downward mounting hole 9 corresponding to a position where each window portion 4 of the outer peripheral wall is formed. The mounting groove 9
The attachment piece 10 that is engaged with is projected. Therefore, the ball holder 3 can be attached to the turntable body 2 by engaging the attachment piece 10 with the attachment groove 9.

By the way, the ball holder 3 is formed of a synthetic resin molded product, but the mounting piece 10 is engaged with the mounting groove 9 so that the mounting piece 10 is prevented from being deformed even at a high temperature. 6 can be prevented from popping out.

[0020]

As described above, according to the present invention, a ball holder accommodating a plurality of balls to which an urging force is applied in the outer peripheral direction is provided on a turntable, and a center hole of a disc is inserted into the ball holder. In a disk holding device configured to hold a disk on a turntable, there is an advantage that the work of attaching the ball can be facilitated.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a cross-sectional view from the center of FIG.

FIG. 4 is a plan view showing the back surface of the ball holder 3 of FIG.

[Explanation of symbols]

 2 turntable body 3 ball holder 4 window 5 spring 6 ball 8 installation groove 8a wide part 8b narrow part

Claims (1)

[Claims] 1. A ball holder accommodating a plurality of balls to which a biasing force is applied from the center to the outer periphery is provided on a turntable, and a center hole of the disc is inserted into the ball holder to place the disc on the turntable. A disk holding device for holding, a window formed on an outer peripheral wall surface of the ball holder, through which a part of the ball projects, and a spring having a diameter smaller than that of the ball for applying a biasing force to the ball. And a mounting groove formed on the back surface of the ball holder so as to mount the ball and the spring from the center toward the respective windows, and the mounting groove has a wide portion wider than the diameter of the ball and a diameter of the ball. The width is narrower, and it is composed of a narrow portion having a width corresponding to the diameter of the spring, and the forming range of the wide portion is one ball from the wall surface provided with the window portion. A disk holding device characterized by: