JPH10275389A - Disk holder for disk player - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily load/unload a disk to a turn table without requiring large power by arranging a disk pressing member, which has a dogleg-shaped protruding part on its cross section, inside a centering member while turning the protruding part toward the diameter direction of the disk, and energizing that member in the diameter direction of the disk through a spring. SOLUTION: A protruding part 6C of the disk pressing member 6 is composed of dogleg-shaped cross sections, namely, included parts 6D and 6E. The disk pressing member 6 is energized in a direction A by the elastic energizing fore of the spring 7, the included part 6E is abutted to an upper corner part D1 in the center hole of the disk D, and the disk D is pressed onto a placing part 3 of the turn table 2. The inclined parts 6D and 6E are inclined at a smooth angle. Thus, operation for placing the disk D onto the turn table 2 and operation for unloading the disk from the turn table 2 can be easily performed, and power for holding the disk D can be fixed regardless of the thickness of the disk D.

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 disk is turned by utilizing the biasing force of a spring provided to bias the ball bearing outward from a rotation center axis. It is configured to be placed and held on a table. In such a device, when the disc is placed on the turntable or removed from the turntable, the ball bearing needs to be displaced in the direction of the rotation center axis against the urging force of the spring. A large force is required when placing or removing the disk on the table, and as a result, there is a problem that the operation of attaching and detaching the disk cannot be performed easily.

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

[0007]

A disk holding device according to the present invention comprises a turntable having a press-fit portion for press-fitting into a rotating shaft of an electric motor and a mounting portion on which a disc is mounted. A centering member which is mounted to rotate integrally with the turntable by press-fitting the turntable into a press-fitting portion and which fits into a center hole formed in the disc; A radially displaceable projection is urged outward from a rotation center axis by a spring, and a projecting portion having a U-shaped cross section projects outward from an opening provided in the centering member. It is composed of a disc pressing member which is urged.

[0008]

1 is a front sectional view of a main part showing a disk holding apparatus according to the present invention, FIG. 2 is an enlarged plan view of the main part, and FIG. 3 is a bottom view of the main part. In the figure, reference numeral 1 denotes a rotary shaft constituting an electric motor, and 2 denotes a turntable which is press-fitted and fixed to the rotary shaft 1 and is formed of metal. And a press-fit portion 4 into which the rotary shaft 1 is press-fitted.

Reference numeral 5 denotes a press-fitting portion 4 formed in the turntable 2, which is mounted so as to rotate integrally with the turntable 2 and is fitted into a center hole formed in the disk D. It is a centering member for positioning the disk D.

Reference numeral 6 denotes a disc pressing member provided in the centering member 5 so as to be capable of sliding displacement of the disc D in the radial direction. The disc pressing member 6 has guide portions 5A and 5B formed on the centering member 5 and guides. A protrusion 6C configured to perform a displacement operation in the radial direction by an engagement guide operation with the grooves 6A and 6B and protruding outside through an opening 5C formed in the centering member 5 is provided. Is formed. The protrusion 6
C is configured such that the cross-sectional shape of the turntable 2 cut in the radial direction becomes a V-shape, that is, an upper first inclined portion 6D and a lower second inclined portion 6E. The lower second inclined portion 6E is configured to be steeper than the upper first inclined portion 6D.

A spring 7 is housed in a housing 5D provided in the centering member 5. The spring 7 presses and biases the disk pressing member 6 outward from the rotation center axis, that is, in the direction of arrow A. have. The spring 7 is configured to be wound around a convex portion 6F formed on the pressing surface of the disk pressing member 6. Reference numeral 5E denotes a support portion formed on the centering member 5, and has a function of supporting a lower portion of the protrusion 6C of the disc pressing member 6. FIG. 3 is a bottom view showing the centering member 5 according to the present invention, in which a reinforcing rib 5 is provided.
F is formed in a ring shape. Further, in such a configuration, the three disk pressing members 6 are provided at equal angles around the rotation shaft 1.

The state shown in FIG. 1 shows a state in which the disk D is placed on the turntable 2, and the disk pressing member 6 is moved outward about the rotating shaft 1 by the elastic biasing force of the spring 7. It is in a state of being pressed and urged. In such a state, the second inclined portion 6E of the projecting portion 6C formed on the disc pressing member 6 has the upper corner portion D of the inner wall forming the center hole formed on the disc D.
1, the displacement force of the disc pressing member 6 in the direction of arrow A causes the disc D to turn on the turntable 2.
Will act as a force pressing against the mounting portion 3.
As a result of such a force acting on the mounting portion 3 of the turntable 2, the disk D rotates with the turntable 2 due to the frictional force between the upper surface of the mounting portion 3 and the lower surface of the disk D. . Therefore, the disk D can be rotated by the rotation driving operation of the turntable 2 by the rotation operation of the rotating shaft 1 of the electric motor.

As described above, the holding operation of the disk D by the disk pressing member 6 is performed. However, when the disk D is pulled up, the upper corner portion D of the disk D is raised.
The upward displacement force acts on the second inclined portion 6 </ b> E formed on the disc pressing member 6. As a result, the disc pressing member 6 is displaced in the direction of the central axis, that is, in the direction of the arrow B against the urging force of the spring 7, so that the disc D can be removed from the mounting portion 3 of the turntable 2.

The operation of removing the disk D from the mounting portion 3 of the turntable 2 is performed as described above. Next, the operation of mounting the disk D on the mounting portion 3 of the turntable 2 will be described. The mounting operation of the disk D on the mounting portion 3 of the turntable 2 is performed so that a center hole formed in the disk D is inserted into the centering member 5 from above. The lower corner portion D2 of the inner wall forming the center hole of the disk D comes into contact with the first inclined portion 6D of the protrusion 6C formed on the disk pressing member 6 at the position where the disk pressing member 6 projects. Then, the disc pressing member 6 is actuated by the contact pressing force.
Is slidably displaced in the direction of arrow B against the urging force of the spring 7, so that the disc D is mounted on the mounting portion 3 of the turntable 2.
Can be placed on

As described above, the operation of placing the disk D on the turntable 2 is performed. When such an operation is performed, the force acting below the disk pressing member 6, that is, the load is formed on the centering member 5. Since the supporting portion 5E is received, the posture of the disc pressing member 6 does not tilt, and the sliding displacement operation can be performed accurately.

As described above, the operation of mounting the disk D on the turntable 2 and the operation of removing the disk D from the turntable are performed, but the inclination angle of the second inclined portion 6E is changed to the inclination angle of the first inclined portion 6D. Since the angle is set to be steeper than that of the disk D, the force required for the operation of removing the disk D can be reduced, and at the time of the operation of mounting the disk D, the inclination angle of the first inclined portion 6D is smaller. The fitting operation with the center hole formed in D can be easily performed.

In this embodiment, the pressing force of the disk D against the turntable 2 is provided by the second inclined portion 6E of the projecting portion 6C formed on the disk pressing member 6. If the angle of the second inclined portion 6E is constant even if the thicknesses of the discs are different, the holding force of all the discs can be made the same.

Further, in this embodiment, the centering member 5
Is pressed into a press-fitting portion 4 formed on the turntable 2 so as to rotate integrally with the turntable 2. However, the turntable 2 and the centering member 5 are formed by integral molding. You can do it.

[0019]

According to the disk holding device of the present invention, the shape of the protrusion of the disk pressing member provided as means for mounting and holding the disk on the turntable is formed in a V shape. Not only can the mounting operation on the turntable and the removing operation from the turntable be performed easily, but also the holding force of the disk can be made constant irrespective of the thickness of the disk.

Further, according to the present invention, since the centering member into which the disc pressing member is incorporated and the turntable are integrally formed, there is an advantage that the number of parts is reduced and the assembling operation can be facilitated. .

According to the present invention, a convex portion is provided on the surface of the disk pressing member pressed by the spring, and the spring is wound around the convex portion. Therefore, the positional relationship between the spring and the disk pressing member is determined. It can be held accurately and the assembling operation can be easily performed.

Further, according to the present invention, since the supporting portion for supporting the lower portion of the projecting portion of the disc pressing member is formed on the centering member, the load received by the disc pressing member at the time of mounting the disc on the turntable is reduced. Can be received at As a result, the present invention has an advantage that the occurrence of the inclination of the posture in which the disc pressing member is inclined can be suppressed, and the sliding displacement operation of the disc pressing member in the radial direction of the disc can be performed accurately. doing.

[Brief description of the drawings]

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

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

FIG. 3 is a bottom view of a main part showing the disk holding device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotation axis 2 Turntable 3 Placement part 5 Centering member 5E Support part 6 Disc pressing member 6C Projection part 7 Spring D Disk

Claims (4)

[Claims] 1. A turntable having a press-fit portion for press-fitting into a rotating shaft of an electric motor and a mounting portion on which a disc is mounted, and a press-fit of the turntable into the press-fit portion. A centering member mounted to rotate integrally with the turntable and fitted into a center hole formed in the disk; and a centering member provided inside the centering member so as to be capable of radially displacing the disk. A disc pressing member urged outward from a rotation center axis by a spring, and a protruding portion of the disc pressing member protruding outside from an opening provided in the centering member. A disk holder for a disk player, characterized in that the shape of the turntable (cut in the radial direction) is in a V shape. 2. A turntable having a press-fitting portion for press-fitting into a rotating shaft of an electric motor and a mounting portion on which a disk is mounted, and a disk formed integrally with the turntable. A centering portion that fits with a center hole formed in the centering portion, and is provided inside the centering portion so as to be able to be displaced in the radial direction of the disk, and is urged outward from the rotation center axis by a spring, and The protruding portion comprises a disk pressing member protruding outside from an opening provided in the centering portion, and the cross-section (cut in the radial direction of the turntable) of the protruding portion is formed into a V shape. A disk holding device for a disk player. 3. The disk holding device according to claim 1, wherein a convex portion on which the spring is wound is formed on a pressing surface of a spring constituting the disk pressing member. 4. The disk holding device according to claim 1, wherein a supporting portion for supporting a lower portion of the projecting portion is formed on a centering member.