JP2006065907A - Disk clamp device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disk clamp device whose disk holding force can be improved with simple constitution and which can be made thin, lightweight, and low-cost. <P>SOLUTION: The disk clamp device has the rotor 1 of a motor rotationally driving a disk 3 and a clamper 6 clamping the disk 3 with the rotor 1, and the clamper 6 has a centering part 6b which is fitted in the center hole 3a of the disk 3 and centers the disk 3. The centering part 6b is provided with a magnet 7, which attracts the rotor 1 as a magnetic body to hold the disk 3 with the rotor 1 and clamper 6. The rotor 1 and clamper 6 are provided with rubber magnets 8 and 9 opposed to each other across the disk 3, and the facing surfaces of the rubber magnets 8 and 9 are magnetized to the opposite polarities. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a disk clamping device for rotatably holding a disk as an information recording medium such as an optical disk.

FIG. 3 is a longitudinal sectional view schematically showing an example of such a conventional disk clamping device. In the figure, reference numeral 1 denotes an iron rotor having a substantially cap shape, for example, which is a member of a spindle motor (not shown) for rotationally driving the disk, and rotates integrally with a rotation axis X passing through the center. . A convex portion 1 a that protrudes upward is formed at the center of the upper surface of the rotor 1. On the upper surface of the convex portion 1 a, for example, a resin turntable 2 having a substantially disk shape is coaxially attached and fixed to the rotor 1.

A substantially cylindrical centering portion 2a for centering the disk is erected from the center of the upper surface of the turntable 2, and a tapered inclined surface 2b is formed on the upper peripheral edge of the centering portion 2a. Yes. Further, the rotation axis X penetrates the center of the turntable 2 and protrudes upward. When the disc 3 as an information recording medium is placed on the turntable 2, the center hole 3a of the disc 3 is guided by the inclined surface 2b and is fitted into the centering portion 2a.
As a result, the disk 3 is centered on the turntable 2.

A sheet member 4 made of ring-shaped rubber or felt or the like is attached to the outer periphery of the upper surface of the turntable 2, thereby preventing the disk 3 from slipping and preventing damage. Although not shown, a claw member or the like that is biased outward is provided on the outer peripheral surface of the centering portion 2a, thereby pressing the inner peripheral surface of the center hole 3a of the disk 3 fitted to the centering portion 2a. The disc 3 may be held while being centered.

A small ring-shaped iron yoke 5 is embedded in the upper surface of the centering portion 2a. On the other hand, above the turntable 2, for example, a resin-made clamper 6 having a substantially disk shape sandwiching the disk 3 therebetween is located, and a small ring-shaped magnet 7 is provided at the center of the lower surface. Buried. Then, when the magnet 7 attracts the yoke 5, the disk 3 is sandwiched and held between the sheet member 4 on the turntable 2 and the clamper 6.

At this time, the upper portion of the rotation shaft X is inserted and fitted into a center hole 6a formed in the center of the clamper 6, and the clamper 6 is centered. However, it is not limited to such a configuration,
For example, the clamper 6 may be fitted with the centering portion 2a of the turntable 2 and centered.

For example, the clamper 6 is rotatably attached to a support body (not shown), and the disk 3 is conveyed by a tray (not shown) and placed on the turntable 2 with the support body raised. Then, when the support is lowered, the disk 3 is turned into the turntable 2.
And the clamper 6. However, it is of course not limited to the configuration using such a support or tray.

In addition, the disc clamping mechanism holds the disc firmly to the turntable with almost stable holding force even if the disc thickness varies, and has a pressing force that prevents the disc itself from floating even at high speeds. Japanese Patent Application Laid-Open No. H10-228688 discloses a device that has low magnetic noise and is compatible with a thin motor.
JP 2003-187510 A

However, with respect to such information recording / reproducing with respect to the optical disc, in recent years, an increase in the speed has been increasingly demanded, and accordingly, the speed of the spindle motor has become indispensable. Therefore, in the disk clamp device, the holding force of the disk must be further improved to prevent the disk from slipping. On the other hand, there is a constant demand for reduction in the thickness and weight of the device, cost reduction, and the like.

In the conventional configuration described in FIG. 3 and the configuration described in Patent Document 1, the turntable on which the disc is placed is indispensable, and this improves the holding force of the disc. It is difficult to reduce the thickness, weight and cost of the above devices.

In view of the above problems, the present invention provides a disc clamping device that can improve the holding force of a disc with a simple configuration, and that can be reduced in thickness, weight, and cost. With the goal.

In order to achieve the above object, according to the present invention, there is provided a rotor of a motor for rotationally driving a disk, and a clamper for sandwiching the disk between the rotor, and the clamper is fitted into a center hole of the disk. And a centering section for centering the disk.

Further, a magnet is provided in the centering portion, and the rotor is held by the rotor and the clamper by attracting the rotor, which is a magnetic body, with the magnet.

Further, the rotor and the clamper are provided with rubber magnets so as to face each other with the disk interposed therebetween, and are magnetized so that the opposing surfaces of the rubber magnets are counter electrodes.

In addition, the clamper is centered by inserting a rotation shaft of the motor into a center hole of the clamper.

According to the present invention, it is possible to provide a disc clamping device that can improve the holding force of a disc with a simple configuration, and that can be reduced in thickness, weight, and cost.

Specifically, the conventional turntable is omitted, and the role is given to the rotor and the clamper, so that the thickness, weight, and cost can be reduced. In addition, by providing a magnet in the centering portion of the clamper and attracting the rotor, which is a magnetic body, with the magnet, a magnetic circuit can be easily formed between the magnet and the rotor. A suction force can be obtained.

In addition, a rubber magnet is provided on the rotor and clamper so as to face each other across the disk, and the magnets are magnetized so that the opposing surfaces of the rubber magnet are opposite to each other, thereby assisting the attractive force by the magnet and the rotor, The holding power of the disk can be improved. Furthermore, since the rubber magnet serves to prevent the disk from slipping and to prevent scratches, the cost of the apparatus can be reduced while improving the performance of the apparatus.

In addition, the configuration in which the clamper is centered by inserting the rotation shaft of the motor into the center hole of the clamper can prevent a recording / reproduction failure caused by the center shake of the clamper.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the part which carries out the same function as the said conventional structure, and detailed description is abbreviate | omitted suitably.

FIG. 1 is a longitudinal sectional view schematically showing a disk clamp device according to Embodiment 1 of the present invention. In this embodiment, the conventional turntable 2 is deleted, and the role is given to the rotor 1 and the clamper 6. Specifically, the disc 3 is placed on the rotor 1 and the clamper 6
Thus, the disk 3 is centered. The clamper 6 has a substantially cylindrical centering portion 6b for centering the disk 3 projecting downward from the center of the lower surface thereof, and a tapered inclined surface 6c is formed on the outer peripheral lower edge of the centering portion 6b. ing.

On the other hand, a concave portion 1b is formed in the central portion of the upper surface of a substantially cap-shaped rotor 1 made of, for example, iron (or any magnetic material). The rotation axis X protrudes upward from the center of the rotor 1. After the disc 3 as the information recording medium is placed on the rotor 1, the center hole 3a of the disc 3 is guided by the inclined surface 6c and fitted into the centering portion 6b.
As a result, the disk 3 is centered on the rotor 1.

On the outer periphery of the upper surface of the rotor 1, a sheet member 4 made of an elastic body such as a ring-shaped rubber or felt or the like is affixed, thereby preventing the disk 3 from slipping and preventing scratches. . Although not shown, a claw member or the like that is biased outward is provided on the outer peripheral surface of the centering portion 6b, thereby pressing the inner peripheral surface of the center hole 3a of the disk 3 fitted to the centering portion 6b. The disc 3 may be held while being centered.

A small ring-shaped magnet 7 is embedded in the lower surface of the centering portion 6b. When the disk 3 is clamped, the centering portion 6 b enters the recess 1 b of the rotor 1, and the magnet 7 attracts the rotor 1, so that the disk 3 is interposed between the sheet member 4 on the rotor 1 and the clamper 6. Is held between. In this case, since the magnet 7 enters the recess 1b of the rotor 1 and a magnetic circuit is easily formed between the magnet 7 and the rotor 1, a stronger attractive force can be obtained than when the conventional yoke 5 is used. Can do.

At the same time, the upper portion of the rotary shaft X is inserted and fitted into a center hole 6a formed in the center of the clamper 6, and the clamper 6 is centered. However, the present invention is not limited to such a configuration. For example, the centering portion 6b of the clamper 6 may be fitted to the concave portion 1b of the rotor 1 and centered.

For example, the clamper 6 is rotatably attached to a support body (not shown), and the disk 3 is transported by a tray (not shown) and placed on the rotor 1 with the support body raised. Then, the disk 3 is sandwiched between the rotor 1 and the clamper 6 by lowering the support. However, it is of course not limited to the configuration using such a support or tray.

FIG. 2 is a longitudinal sectional view schematically showing a disc clamp device according to a second embodiment of the present invention. In this embodiment, instead of the sheet member 4, a rubber magnet 8, which is a magnet having elasticity, is attached to the outer periphery of the upper surface of the rotor 1 in the configuration of the first embodiment. In addition, a rubber magnet 9, which is also a magnet having elasticity, is embedded in the outer periphery of the lower surface of the clamper 6 so as to face the rubber magnet 8 across the disk 3.

The rubber magnets 8 and 9 are preliminarily magnetized and provided so that the surfaces facing each other are counter electrodes, so that an attractive force is generated between them. For example, if the surface of the rubber magnet 8 provided on the rotor 1 is set to N pole, the surface of the rubber magnet 9 provided on the clamper 6 is set to S pole. Thereby, the attraction force by the magnet 7 and the rotor 1 is assisted, and the holding force of the disk 3 is improved.

Here, since the rubber magnet 8 also serves as the sheet member 4, the cost of the apparatus can be reduced while improving the performance of the apparatus. Furthermore, since the rubber magnet is cheaper than the sheet member at present, when a high speed spindle motor is required, the rubber magnets 8 and 9 can be attracted to each other as in this embodiment. It becomes possible to respond at a relatively low cost.

In the configuration of the first embodiment shown in FIG. 1, a rubber magnet 8 may be used instead of the sheet member 4. In this case, it is not necessary to have the function of a magnet. However, as described above, since the rubber magnet is cheaper than the sheet member at present, the cost can be reduced if the sheet member is a rubber magnet.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view schematically showing a disk clamp device according to Embodiment 1 of the present invention. The longitudinal cross-sectional view which shows typically the disc clamp apparatus which concerns on Example 2 of this invention. The longitudinal cross-sectional view which shows typically an example of the conventional disc clamp apparatus.

Explanation of symbols

1 Rotor 2 Turntable 3 Disc 4 Sheet member 5 Yoke 6 Clamper 7 Magnet 8, 9 Rubber magnet

Claims (5)

A rotor of a motor that drives the disk to rotate, and a clamper that sandwiches the disk between the rotor, and the clamper includes a centering portion that is fitted in a center hole of the disk and centers the disk;
By providing a magnet in the centering portion and attracting the rotor that is a magnetic body with the magnet, the disk is held by the rotor and the clamper,
The rotor and the clamper are each provided with a rubber magnet so as to face each other with the disk interposed therebetween, and are magnetized so that the respective facing surfaces of the rubber magnet are counter electrodes,
The disc clamp device characterized in that the clamper is centered by inserting a rotation shaft of the motor into a center hole of the clamper. A rotor of a motor that drives the disk to rotate, and a clamper that sandwiches the disk between the rotor, and the clamper includes a centering portion that is fitted in a center hole of the disk and centers the disk A disc clamping device characterized by that. 3. The disk according to claim 2, wherein a magnet is provided in the centering portion, and the rotor is held by the rotor and the clamper by attracting the rotor that is a magnetic body with the magnet. Clamping device. 4. A rubber magnet is provided on each of the rotor and the clamper so as to face each other with the disk interposed therebetween, and the rubber magnets are magnetized so that opposite surfaces of the rubber magnets are opposed to each other. The disc clamp device according to 1. The disk clamp device according to any one of claims 2 to 4, wherein the clamper is centered by inserting a rotating shaft of the motor into a center hole of the clamper.

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