JPH10106090A - Clamp device for disk - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clamp device for clamping a disk in a mounting part formed on a turntable. SOLUTION: The clamp device is composed of the turntable 3 formed with the mounting part 4 to be mounted with the disk D and a center ring part 6 to be inserted into a center hole formed in the disk D, a magnetic body 8 fixed to the center ring part 6, a clamp member 9 for holding the disk D between itself and the mounting part 4 at the time of its clamping operation, fixedly fitted with a magnet 12 for attracting the magnetic body 8 and a center member 13 provided in a central part of the clamp member 9 and also inserted with its tip part into a positioning hole 7 formed in a central part of an upper surface of the center ring part 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamp device for placing a disk having a hole at the center on a turntable.

[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]

A disk clamping operation is performed by mounting a disk on a mounting portion formed on a turntable and then mounting a clamp member on the turntable from above. If the positional relationship between the clamp member and the turntable is not made accurate, there is a problem that uneven load on the turntable causes uneven rotation and vibration. There is a problem that such adverse effects due to rotation unevenness and vibration increase as the disk rotation speed increases to twice or four times.

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

[0005]

According to the present invention, there is provided a clamp apparatus comprising: a turntable having a mounting portion on which a disk is mounted and a center ring portion inserted into a center hole formed in the disk; A magnet that clamps the disk between the magnetic body fixed to the center ring portion and the mounting portion of the turntable at the time of the clamp operation and attracts the magnetic body of the center ring portion is attached and fixed. It comprises a clamp member and a center member provided at the center of the clamp member and having a tip inserted into a positioning hole formed at the center of the upper surface of the center ring.

[0006]

FIG. 1 is a side sectional view of an essential part showing an embodiment of the clamp device of the present invention, FIG. 2 is a plan view showing a center member constituting the clamp device of the present invention, and FIG. 3 is a clamp of the present invention. FIG. 4 is a front view showing a center member constituting the apparatus, and FIG. 4 is a plan view showing a mounting board constituting the clamp apparatus of the present invention.

In FIG. 1, reference numeral 1 denotes an electric motor which rotates when supplied with power when reproducing a signal recorded on a disk D. The electric motor 1 has a rotating shaft 2 and a screw on a fixed substrate (not shown). (Not shown) or the like. Reference numeral 3 denotes a turntable having a mounting portion 4 on which the disk D is mounted and a press-fit hole 5 for press-fitting the rotary shaft 2 of the electric motor 1, and is inserted into a center hole formed in the disk D. A centering 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 clamp member which constitutes a clamp means, and includes a pressing portion 9A for pressing the disk D from above and a concave portion 10 into which the upper portion of the center ring portion 6 is inserted.
And a holding portion 9B that forms The insertion edge 9C of the holding portion 9B forming the concave portion 10 is inclined so as to have a shape corresponding to the tapered portion 6A of the center ring portion 6.

Reference numeral 11 denotes a mounting substrate which is fixedly united with the clamp member 9 and is made of a magnetic material. A ring-shaped magnet 12 is bonded and fixed. The magnet 12 is
The mounting substrate 11 is mounted and fixed to a predetermined position of the clamp member 9 by the mounting operation to the clamp member 9 and the holding operation by the holding portion 9B. 13 is a fitting hole 11A formed in the center of the mounting board 11.
The center member has a positioning portion 13A formed therein and an insertion portion 13B inserted into a positioning hole 7 formed in the center of the upper surface of the center ring portion 6. Center hole 12 of magnet 12
The insertion portion 13B has a tapered portion 13C that is configured to be inserted into the insertion portion 13A and that has a shape corresponding to the mortar-shaped opening of the positioning hole 7 on the main body side of the insertion portion 13B.

The shape of the fitting hole 11A formed in the mounting board 11 and the shape of the positioning portion 13A formed in the center member 13 have the same shape as shown in FIGS. In the state where the positioning portion 13A formed on the center member 13 is fitted into the fitting hole 11A formed on the mounting substrate 11, the magnet 12 is attached to the mounting substrate 11. The center member 1 is bonded and fixed.
3 is mounted and fixed on the mounting substrate 11.

The clamping device of the present invention is configured as described above. Next, the operation of clamping the disk D will be described. FIG. 1 shows a state in which the disk D is clamped on the turntable 3. As is clear from FIG. 1, the magnet 12 and the magnetic body 8 fixed to the center ring 6 of the turntable 3 are connected. Since they face each other, the attraction force of the magnet 12 acts on the magnetic body 8.

Accordingly, a downward urging force acts on the clamp member 9 to which the magnet 12 is attached and fixed. As a result, the pressing portion 9A formed on the clamp member 9 is Since the surface of D is pressed against the mounting portion 4 of the turntable 3, the disc D is pressed and held on the turntable 3 by the clamp member 9.

When the turntable 3 is driven to rotate by the rotation of the electric motor 1 as a result of the above-mentioned clamping operation, the rotation driving operation of the disk D is performed, and the signal recorded on the disk D is picked up. Reading operation can be performed.

The clamping operation when the disk D is mounted on the mounting portion 4 of the turntable 3 is performed as described above. In this state, the lower surface of the magnet 12 and the centering portion 6 It is set so that a gap is formed between the upper surface of the device. Therefore, the attractive force of the magnet 12 is applied to the surface of the disk D via the clamp member 9,
The holding operation of the disk D can be performed.

The disk D is placed on the turntable 3
When the clamp member 9 is mounted on the turntable 3 in a state where the clamp member 9 is not mounted on the mounting portion 4, the tapered portion 13 C of the center member 13 and the center ring portion 6
The positioning position of the positioning hole 7 formed in the center of the upper surface of the slab is in contact with the mortar-shaped portion, or the magnetic body 8 is disposed below the upper end surface of the centering portion 6 as is clear from FIG. Thus, a gap is set between the lower surface of the magnet 12 and the upper surface of the magnetic body 8. Therefore, the attraction force between the magnet 12 and the magnetic body 8 does not become unnecessarily large, and the detachment operation of the clamp member 9 from the turntable 3 can be performed with a small force. Therefore, when the clamping operation by the clamp member 9 is performed on a disc player configured to perform the rotation by the electric motor, an electric motor with a small torque can be used.

As described above, the clamping operation of the clamping device in this embodiment is performed.
The operation of attaching the clamp member 9 to the clamp will be described. The mounting operation of the clamp member 9 on the turntable 3 is performed in association with the moving operation of a tray or the like for displacing the disk D from the mounting / dismounting position to the operating position. When such operation is performed, if the positional relationship between the turntable 3 and the clamp member 9 is shifted, the insertion portion 13B of the center member 13 provided on the clamp member 9 is inserted into the center ring portion 6. Is inserted into the positioning hole 7 while being guided by the mortar-shaped portion of the positioning hole 7 formed at the center of the upper surface of the. As a result, the guiding operation of the insertion portion 13B of the center member 13 by the positioning hole 7, that is, the centering operation is performed, and the centering portion 6 of the turntable 3 is inserted into the concave portion 10 formed in the clamp member 9. Is performed.

FIG. 1 shows a state in which the above-described operation has been performed, and the insertion portion 13B of the center member 13 provided on the clamp member 9 is inserted into the center ring portion 6.
Is inserted into the positioning hole 7 formed in the center of the upper surface of the turntable 3, so that the positional relationship of the clamp member 9 with respect to the centering portion 6 of the turntable 3 can be set in the best condition.

As described above, the clamping operation of the clamping device of the present invention is performed. Next, the assembling operation will be described. As shown in FIG. 4, a fitting hole 11A having the same shape as the positioning portion 13A of the center member 13 is formed in the mounting board 11 constituting the clamp device of the present invention, and the center is formed in the fitting hole 11A. In a state where the positioning portion 13A of the member 13 is fitted, the magnet 12 is bonded and fixed to the mounting substrate 11. At this time, since the attracting force of the magnet 12 acts on the mounting substrate 11 made of a magnetic material, it is not necessary to use an adhesive when a large mounting fixing force is obtained.

In this way, the clamp means can be formed by combining the mounting substrate 11 on which the magnets 12 and the center member 13 are mounted with the clamp member 9, and such a combining operation is performed by the clamp member 9. This can be performed by engaging the formed engaging claws 9D with the engaging holes 11B formed in the mounting board 11. The clamp device can be assembled by attaching the clamp means thus assembled to a clamp mechanism (not shown) for moving the clamp means on the turntable 3 at the time of the clamp operation so that the clamp means can be rotated and vertically displaced.

[0021]

According to the clamp device of the present invention, the tip of the center member provided at the center of the clamp member in the positioning hole formed at the center of the upper surface of the center ring of the turntable for driving the disk. Since the clamp member is positioned by inserting the part, the mounting position of the clamp member on the turntable can be made accurate. As a result, the unbalanced load of the turntable can be reduced, and the present invention has an extremely large effect of reducing the rotation unevenness and vibration of the disk.

Further, in the present invention, since the shape of the opening of the positioning hole formed in the center of the upper surface of the center ring portion of the turntable is formed in a mortar shape, the positional relationship between the turntable and the clamp member is shifted. Even so, the operation of inserting the center member into the positioning hole can be reliably performed, and as a result, the operation of attaching the clamp member to the turntable can be performed without any trouble.

According to the present invention, since the fixing operation of the center member to the mounting substrate is performed by the attracting force of the magnet, an assembling operation for fixing the center member is not required and the assembling work is simplified. It has the advantage of becoming. Further, since the positioning portion is formed in the center member and the fitting hole in which the positioning portion is fitted is formed in the mounting substrate, the thickness of the mounting substrate can be used. This has the effect that the device can be made thinner.

[Brief description of the drawings]

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

FIG. 2 is a plan view showing a center member constituting the clamp device of the present invention.

FIG. 3 is a front view showing a center member constituting the clamp device of the present invention.

FIG. 4 is a plan view showing a mounting board constituting the clamp device of the present invention.

[Explanation of symbols]

 D disk 1 motor 2 rotating shaft 3 turntable 4 mounting part 6 centering part 7 positioning hole 8 magnetic body 9 clamp member 11 mounting board 12 magnet 13 center member

Claims (4)

[Claims] 1. A turntable having a mounting portion on which a disk is mounted and a center ring portion inserted into a center hole formed in the disk, and a magnetic member fixed to the center ring portion. Body, a clamp member which clamps a disk between the mounting portion of the turntable at the time of the clamp operation and a magnet for attracting the magnetic body of the center ring portion, and a center portion of the clamp member. A disk clamping device comprising: a center member provided and a tip portion inserted into a positioning hole formed in a center portion of an upper surface of the center ring portion. 2. The clamping device according to claim 1, wherein the shape of the opening forming the positioning hole is mortar-shaped. 3. The clamping device according to claim 1, wherein the center member is attached to and fixed to a mounting substrate constituting a clamp member by an attraction force of a magnet. 4. The clamping device according to claim 3, wherein a positioning portion is formed in the center member, and a fitting hole in which the positioning portion is fitted is formed in the mounting board.