JPH09147479A - Turntable device for disk player - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a device facilitating the loading/unloading operation of a disk by providing a disk holding member and a turntable to which the urethane coating is applied on the disk placing surface. SOLUTION: A bearing 8 is in the state being pressed outward, i.e., in the direction of the arrow A, taking a rotary shaft 2 as a center by the elastic force of a spring 9. In this case, the displacing force to the direction of the arrow A of the bearing 8 is exerted on a corner part D1 on the inner wall of a center hole formed on the disk D. Thus, the force pressing the disk D onto the placing part 5 of the turntable 4 is exerted thereon. As the result of the exertion of such a force, the disk D is rotated with the turntable 4 by the frictional force between the disk placing surface 5A coated with urethane and the lower surface of the disk D. Consequently, the disk D is rotatable by the rotation driving operation of the turntable 4 in company with the rotational operation of a motor 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc player, and more particularly to a disc holding device for placing and holding a disc on a turntable.

[0002]

2. Description of the Related Art An optical disk player configured to read a signal recorded on a disk using an optical pickup has become widespread, and such a disk player has a disk mounted thereon. And a turntable for rotating the disk.

[0003] As a typical optical disc player, a CD player is generally well known. Some of such CD players include a headphone stereo type which is configured to listen to reproduced sound through headphones. There is a portable CD player. Recently, a CD-R used in combination with a computer
OM players are widespread.

The above-mentioned headphone stereo type portable CD player and CD-ROM player incorporated in a personal computer are required to reduce the size, especially the thickness, of the apparatus main body. As a disk holding device used in such a player, there are various types, but a so-called ball chucking holding device using a ball bearing disclosed in Japanese Utility Model Laid-Open No. 5-73746 is commercially available.

[0005]

The above-described ball chucking device has an advantage that the disc player can be thinned because a member for clamping the disc from above is not necessary, but the disc holding device has the advantage. There is a problem of small power. In the case of an audio disc player in which the disc rotation speed is driven at a specified linear velocity, there was no problem even if the holding power of the disc was small. A disc player driven at a linear velocity has a problem of insufficient disc holding power.

As a method of solving such a problem, there is a method of increasing the elastic force of a spring provided to press and urge the ball bearing which performs the chucking operation in the outer peripheral direction. There is a problem that the attachment / detachment operation cannot be easily performed.

The present invention intends to provide a turntable device for a disc player which solves the above problem.

[0008]

DISCLOSURE OF THE INVENTION A disk holding device of the present invention is a turntable which is press-fitted and fixed to a rotary shaft of an electric motor and has a disk mounting surface on which a disk is mounted, which is coated with urethane. It is composed of a disk holding member which is mounted so as to rotate integrally with the turntable by press-fitting into a rib formed in the central portion and has a ball bearing inside which holds a disk.

[0009]

According to the present invention, the holding force of the disc is increased by applying urethane coating to the disc mounting surface of the turntable on which the disc is mounted.

[0010]

1 is a front sectional view of a main part of a turntable device according to the present invention, and FIG. 2 is a plan view of a main part of the turntable device according to the present invention.

In the figure, reference numeral 1 is an electric motor for rotationally driving a disk D, which has a rotary shaft 2 protruding upward and is fixedly mounted on a fixed substrate 3. A turntable 4 is press-fitted into the rotary shaft 2 so as to be rotationally driven by the electric motor 1. A turntable 4 on which a disk D is placed is formed, and an elastic ring is formed in the center thereof. The rib 6 is formed. The disk mounting surface 5A formed on the outer peripheral side of the mounting portion 5 of the turntable 4 is coated with urethane paint having a high friction coefficient. The coating operation of such urethane paint is performed by spraying.

By being press-fitted into an annular rib 6 formed on the turntable 4, 7 is attached so as to rotate integrally with the turntable 4 and fits with a central hole provided in the disk D. The disc holding member 8 is a ball bearing which is provided in the disc holding member 7 by a known structure and is urged outward by the spring 9 about the rotation shaft 2, and the disc D is turned on the turntable. 4 has a function of being pressed and mounted on the mounting portion 5. Then, such a ball bearing 8 is formed at an equal angle as shown in FIG.
One is provided. A slit 10 is formed on the upper surface of the disc holding member 7 at a position corresponding to the ball bearing 8 as shown in the drawing.

In such a structure, the upper end of the ball bearing 8 is inserted into the slit 10 and the height of the upper end of the ball bearing 8 coincides with the height of the upper surface of the disc holding member 7. There is. Further, a thick portion 11 is formed above the press-fitting portion of the disc holding member 7 into the annular rib 6.

In such a structure, the disc holding member 7 having the ball chucking device incorporated therein is press-fitted into the annular rib 6 formed on the turntable 4 to attach the disc holding member 7 to the turntable 4. In addition, the disk holding device of the present invention can be assembled by press-fitting the turntable 4 assembled in this manner onto the rotary shaft 2 of the electric motor 1.

When such an assembling operation is performed, since the thick portion 11 is formed on the upper portion of the press-fitting portion of the disc holding member 7 into the annular rib 6, the disc holding member 7 is cracked when the above-mentioned press-fitting operation is performed. The occurrence of such an accident can be prevented.

The state shown in FIG. 1 shows a state in which the disc D is placed on the turntable 4, and the ball bearing 8 is rotated by the elastic force of the spring 9 to the rotary shaft 2.
It is in a state of being pressed and urged outward with respect to, that is, in the direction of arrow A. The displacement force of the ball bearing 8 in the direction of arrow A acts on the corner portion D1 of the inner wall of the center hole formed in the disc D, and as a result, the force that pushes the disc D against the mounting portion 5 of the turntable 4 acts. Will be done. As a result of such force acting on the mounting portion 5 of the turntable 4, the disc D moves together with the turntable 4 due to the frictional force between the disc mounting surface 5A coated with urethane paint and the lower surface of the disc D. It will rotate. Therefore, the disk D can be rotated by the rotation driving operation of the turntable 4 by the rotation operation of the electric motor 1.

In this embodiment, urethane coating is applied to the disk mounting surface of the turntable, but it is possible to increase the frictional force between the disk and the disk by baking and coating the resin. You can also

[0018]

In the turntable device of the present invention, urethane coating is applied to the disk mounting surface of the turntable on which the disk is mounted, so that the frictional force between the disk and the disk can be increased. As a result, the holding force of the disc by the ball chucking device can be increased, which is very effective when applied to a disc player having a high disc rotation speed. Further, since the urethane coating is applied in order to increase the frictional force of the disc mounting surface, the mounting portion of the turntable can be made thinner than in the case where an elastic material such as rubber is stuck. Has a great effect on making the disc player thinner.

Further, according to the present invention, since the slit is formed on the upper surface of the disk holding member so that the height of the upper end portion of the ball bearing matches the height of the upper surface of the disk holding member, the height of the disk holding device is minimized. It has the advantage of being able to

[Brief description of the drawings]

FIG. 1 is a front sectional view of an essential part showing a turntable device of the present invention.

FIG. 2 is a plan view of an essential part showing a turntable device of the present invention.

[Explanation of symbols]

 1 Electric Motor 2 Rotating Shaft 4 Turntable 5 Placement Part 5A Disc Placement Surface 7 Disc Holding Member 8 Ball Bearing 9 Spring 10 Slit D Disc

Claims (2)

[Claims] 1. A turntable, which is press-fitted and fixed to a rotary shaft of an electric motor and on which a disc is mounted, and integrally rotated with the turntable by press-fitting to a rib formed in the center of the turntable. A turntable device for a disc player, comprising a disc holding member which is mounted in a suitable manner and holds a disc therein, and a urethane coating is applied to a disc mounting surface of the turntable. 2. The turntable device according to claim 1, wherein a slit is formed on the upper surface of the disk holding member so that the height of the upper end of the ball bearing matches the upper surface of the disk holding member.