JPH09293304A - Disk holder for disk player - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to reduce in thickness a disk holder and a disk player by providing a roller rotatable in the radial direction of a disk in a centering member. SOLUTION: The disk holder comprises a turntable 7, a centering member and a roller 19. The turntable 7 has a press-fitted part 9 press-fitted in the rotary shaft 4 of a motor and a placing part for placing a disk D. The centering member 10 is mounted to integrally rotate with the turntable 7 by press-fitting in the part 9 of the turntable 7, and engaged with the central hole of the disk D. The roller 19 is provided rotatably in the radial direction of the disk D in the member 10, and urged outward by a spring 23 from the rotating center axis. Accordingly, the part of the roller 19 is projected out of the opening of the member 10, the roller 19 is brought into pressure contact with the inner wall of the hole of the disk D to press and hold the disk D on the turntable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk player, and more particularly to a disk holding device for mounting and holding a disk 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. When thinning such a disc player, the thickness of the disc holding device for holding the disc on the turntable becomes a problem. As a disk holding device that solves such a problem, for example, a disk holding device called ball chucking using a ball bearing disclosed in Japanese Patent Application Laid-Open No. 5-151675 is generally employed.

[0005]

In a disk holding device using a ball bearing, a resin member is used as a holding member for holding a spherical ball bearing at a predetermined position, but the resin wall portion becomes thick. Therefore, there was a problem in reducing the thickness.

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

[0007]

DISCLOSURE OF THE INVENTION A disk holding device according to the present invention includes a turntable having a press-fitting portion for press-fitting into a rotating shaft of an electric motor and a mounting portion for mounting a disc. A centering member that is mounted to rotate integrally with the turntable by press-fitting into the press-fitting portion of the turntable and that fits into a center hole formed in the disc; and a disc inside the centering member. The roller is provided so as to be capable of rolling displacement in the radial direction, and is composed of a roller urged outward from the rotation center axis by a spring.

[0008]

1 is a front sectional view of a main part showing a disk holding apparatus according to the present invention, and FIG. 2 is a partially broken plan view of the main part. In the figure, reference numeral 1 denotes a substrate on which a drive circuit of an electric motor is incorporated, and a support member 3 for supporting the drive coil 2 is fixed. Reference numeral 4 denotes a rotating shaft constituting the electric motor, which is rotatably supported by bearings 5 and 6 fixed to the support member 3. Reference numeral 7 denotes a turntable which is press-fitted and fixed to the rotary shaft 4 and is formed of metal. The turntable 7 has a mounting portion 8 on which the disk D is mounted and is press-fitted into which the rotary shaft 4 is press-fitted. The portion 9 is formed to extend upward from the upper surface of the mounting portion 8.

Reference numeral 10 denotes a press-fitting portion 9 formed in the turntable 7, which is mounted so as to rotate integrally with the turntable 7, and is fitted into a center hole formed in the disk D. The disk D
A centering member 11 for positioning the engaging portion 1 formed on the lower surface of the mounting portion 8 of the turntable 7;
2 is a rotor attached so as to rotate integrally with the turntable 7 by swaging with a ring-shaped magnet 13 having a ring-shaped magnet 13 adhered and fixed to the inner surface side and a bent portion extending outward at the lower end thereof. 14 are formed.

Reference numeral 15 denotes a retaining member fixed to a fixed substrate (not shown) together with the substrate 1 by screws 16, and a bent portion 14 formed on the rotor 11.
Is formed above the bent piece 17. Reference numeral 18 denotes a ring-shaped elastic sheet that is adhered and fixed to the mounting portion 8 of the turntable 7, and is configured to contact the lower surface of the disk D and support the disk D. Reference numeral 4A denotes a washer attached to and fixed to the rotary shaft 4, and has a function of positioning the turntable 7 with respect to the rotary shaft 4.

Reference numeral 19 denotes a roller provided in the centering member 10 so as to be capable of rolling displacement of the disk D in the radial direction. The roller 19 is formed on the centering member 10 on a shaft 20 formed at the center thereof. Guide section 21
The disc D is provided so as to be capable of rolling displacement in the radial direction by the contact regulation by the roller and the contact support of the roller 19 with the support portion 22 formed on the turntable 8. Reference numeral 23 is a spring provided in the centering member 10, and has a function of pressing and urging the roller 19 outward from the rotation center axis, that is, in the direction of arrow A.

In this structure, the roller 19 is projected to the outside through the opening 10b formed in the outer peripheral surface 10a of the centering member 10, and the protruding position of the roller 19 is the contact of the guide portion 21 with the shaft 20. Determined by contact regulations. The three rollers 19 having such a configuration are provided at equal angles as shown in FIG. Further, a slit 10c is formed at a position on the upper surface of the centering member 10 corresponding to the roller 19, as shown in the drawing, and the upper end of the roller 19 is inserted into the slit 10c and the upper end thereof. Of the centering member 10 is equal to the height of the upper surface of the centering member 10.

The state shown in FIG. 1 shows a state in which the disk D is placed on the turntable 7, and the roller 19 is rotated by the elastic biasing force of the spring 23.
In a state of being urged outward with the center at the center. As a result of the displacement force of the roller 19 in the direction of arrow A acting on the corner portion D1 of the inner wall forming the central hole formed in the disc D, the force for pressing the disc D against the mounting portion 8 of the turntable 7 is increased. Will work. As a result of such force acting on the mounting portion 8 of the turntable 7, the disc D is brought into a state of rotating with the turntable 7 due to the frictional force between the elastic sheet 18 and the lower surface of the disc D. Therefore, the disk D can be rotated by the rotation driving operation of the turntable 7 by the rotation operation of the rotating shaft 4 of the electric motor.

As described above, the holding operation of the disk D by the roller 19 is performed, but when the disk D is pulled up, the roller 19 resists the urging force of the spring 23 and moves in the central axis direction, that is, the arrow B direction. The disk D can be removed from the mounting portion 8 of the turntable 7 since it can be displaced. Then, in such a case, the displacement operation of the roller 19 in the direction of the arrow B is performed by the rotation operation of the roller 19, that is, the rolling operation, so that the displacement operation of the roller 19 can be smoothly performed. Therefore, the operation of removing the disk D from the mounting portion 8 of the turntable 7 can be easily performed. In this way, the operation of removing the disc D from the mounting portion 8 of the turntable 7 is performed, but conversely, the turntable 7 is removed.
The mounting operation of the disk D on the mounting portion 8 can be similarly smoothly performed.

In the present embodiment, the turntable 7 is used as the upper plate of the rotor that constitutes the electric motor, but the turntable 7 and the rotor can be implemented in separate driving devices. Further, according to the present invention, since the turntable 7 is configured to be used as the upper plate of the rotor constituting the electric motor, it is possible to eliminate the gap between the turntable and the rotor and to reduce the thickness of the disk drive mechanism. You can do it.

[0016]

Since the disk holding device of the present invention uses the roller as a means for mounting and holding the disk on the turntable, the diameter of the roller is smaller than that of the ball bearing. It can be made smaller than the diameter. Therefore, according to the present invention, the height of the disc holding mechanism can be reduced, and the present invention has a very great effect in reducing the thickness of the disc player.

Further, according to the present invention, when the disc is placed on the turntable and when the disc is removed from the turntable, the roller rotates and is displaced in the radial direction of the disc. The present invention has an advantage that the disk mounting / removing operation can be smoothly performed.

Further, the disk holding device of the present invention constitutes the electric motor of a turntable which is press-fitted and fixed so as to rotate integrally with the rotary shaft of the electric motor and has a mounting portion on which the disk is mounted. Since it is configured to be used as a top plate of a rotor, the gap between the electric motor and the turntable can be eliminated. Therefore, the present invention is very suitable for thinning the disc player. It has a great effect.

Further, according to the present invention, since the slit is formed on the upper surface of the centering member and the upper end of the roller is inserted into the slit, the centering member can be made thin. Further, according to the present invention, since the height of the upper end portion of the roller is matched with the height of the upper surface of the centering member, the height of the disk holding device can be minimized.

[Brief description of drawings]

FIG. 1 is a front sectional view of a main part showing a disk holding device of the present invention.

FIG. 2 is a partially broken plan view of a main part showing the disk holding device of the present invention.

[Explanation of symbols]

 1 substrate 2 drive coil 3 support member 4 rotating shaft 7 turntable 8 mounting portion 9 press-fitting portion 10 centering member 10b opening 10c slit 11 rotor 13 magnet 19 roller 23 spring

Claims (4)

[Claims] 1. A turntable having a press-fitting part for press-fitting into a rotary shaft of an electric motor and a mount part for mounting a disk, and the press-fitting into the press-fitting part of the turntable, A centering member that is mounted so as to rotate integrally with the turntable and that fits into a center hole formed in the disc, and is provided inside the centering member to allow radial displacement of the disc in the radial direction. And a roller urged outward from the center axis of rotation by a spring, and a part of the roller is projected to the outside from an opening provided in the centering member and the roller is centered on the disk. The disc is pressed and held on the turntable by pressing it against the corner of the inner wall that forms the hole. A disc holding device for a disc player. 2. The turntable is used as a top plate of a rotor constituting an electric motor.
3. The disk holding device according to claim 1. 3. The disk holding device according to claim 1, wherein a slit is formed on the upper surface of the centering member, and the upper end of the roller is inserted into the slit. 4. The disk holding device according to claim 3, wherein the height of the upper end of the roller is made to coincide with the upper surface of the centering member.