JP2002358706A - Disk clamp mechanism and disk drive provided with the disk clamp mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk clamp mechanism highly accurately and reliably maintaining centering though a simple structure even when used at high-speed rotation by solving horizontal slippage by centrifugal force during the high-speed rotation due to the mass eccentricity of a disk, and to provide a disk drive provided with the disk clamp mechanism. SOLUTION: To the end part of a shaft 3 passing through the rotor yoke 2 of a spindle motor 1, a turntable 4 is fixed. A center guide 4b to fit the center hole of the disk is provided on the center of the disk mounting surface 4a of the turntable 4 and a magnet 5 is housed in a ring shape in the center opening part. Also, a clamper device 11 is arranged above the disk mounting surface 4a of the turntable 4. The clamper device 11 is constituted by fitting a clamper 8 and a yoke 9 in the ring shape at the center and fixing them to a clamper base 10. The clamper device 11 is supported by its own weight in the axial direction of the shaft 3 of the spindle motor 1 to which the turntable 4 is fixed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk recording / reproducing apparatus, and more particularly to a disk clamp mechanism for mounting a disk on a turntable and a disk drive provided with the disk clamp mechanism.

[0002]

2. Description of the Related Art Usually, a media disk serving as a removable recording medium is made of a synthetic resin, and has a center hole at the center thereof. Also, when recording and reproducing such a media disk, the center hole of the disk is mounted on a turntable of a recording and reproducing apparatus for the media disk and rotated. The variation is relatively large, causing the center of the disc to be displaced with respect to the turntable, making it difficult for the recording / reproducing head to follow, and preventing good recording / reproducing. Has become. For this reason, it is usually necessary to provide a centering mechanism on the turntable of the disk drive so that the center of the disk always coincides with the rotation axis of the spindle motor that rotates the media disk.

Conventionally, there are two types of the centering mechanism, namely, a center cone type and a multi-jaw type.

In the center cone method, a center guide which is slidable in the axial direction and has a truncated cone shape is provided at an end at the center of the turntable on the side where the disc is mounted. The shape of the truncated cone of the center guide is such that the base diameter is larger than the maximum allowable value of the center hole diameter of the disc, and the end part serves as a guide when the disc is inserted. It is configured to be much smaller than the minimum allowable value of the diameter, so that it can slide in the rotation axis direction of the spindle motor. The slide is performed by a coil spring or the like fitted into the bottom of the mounting hole of the center guide of the turntable and the cylinder of the center guide.

When a disk is mounted on a turntable having such a structure, first, the disk is set on a disk tray of a disk recording / reproducing apparatus and slid laterally.
When stopped at the insertion position, the center hole is inserted into the end of the center guide of the turntable, and at the same time, the clamper descends from above in parallel with the disk mounting surface of the turntable to push down the disk. Thus, the center hole of the disk is mounted on the disk mounting surface of the turntable while being supported by the tapered portion of the truncated cone. The disc mounted in this way can be rotated coaxially with the rotation axis of the spindle motor without play.

On the other hand, in the multi-jaw method, a plurality of centering claws for centering the loaded disk are provided on a center guide provided at the center of the turntable on the disk loading side. The centering claw has a spring property, and a plurality of the centering claws are arranged on a coaxial circle with the spindle motor shaft,
The circumferential diameter indicated by the envelope at the upper end is much smaller than the minimum allowable value of the diameter of the center hole of the disc because it acts as a guide when the center hole of the disc is inserted. Since the circumferential diameter indicated by the line has a function of radially pressing the peripheral wall of the center hole of the disc, the circumferential diameter is set to be larger than the maximum allowable value of the diameter of the center hole of the disc.

When a disc is placed on a turntable having such a structure, first, the disc is set on a disc tray of a disc recording / reproducing apparatus and slid laterally.
When stopped at the insertion position, the center hole is inserted into the end of the center guide of the turntable, and at the same time, the clamper descends from above in parallel with the disk mounting surface of the turntable to push down the disk. As a result, the center hole of the disc is fitted into the center guide claw, and the peripheral wall of the center hole of the disc is pressed uniformly in the radial direction by the centering claw. The disc mounted in this way can be rotated coaxially with the rotation axis of the spindle motor without play. Further, this method has a slightly lower holding force in the radial direction than the above-described method, but can be used to form an inexpensive and thin device.

In either system, a disk placed on a turntable by a centering mechanism is clamped by a clamper. Specifically, the disk is sandwiched and fixed between the turntable and the clamper by a magnetic attraction effect generated by a permanent magnet provided at the center of the center guide of the turntable and a yoke provided at the center of the clamper. Conversely, a permanent magnet may be provided on the clamper side, and a yoke may be provided on the turntable side to use the magnetic attraction function.

[0009]

However, the disc mounted on the disc clamp device constructed as described above also has a problem of eccentricity mainly due to weight. When an object having an eccentric center is rotated, a centrifugal force proportional to the square of the number of rotations is generated, and thus a biasing force that cannot be expected at high speed rotation may be generated. This means that if a disk centered and held using magnetic force as described above is used at high speed, if the disk itself has an eccentricity, a strong centrifugal force will be generated due to it, and the movable center guide Distorting the disc, causing the disc itself to slide sideways, deteriorating the centering, and further increasing the eccentricity, thereby increasing the centrifugal force that is generated and moving the disc itself to one side, resulting in worse recording and reproduction. I have

Therefore, the present invention solves the side slip during high speed rotation due to centrifugal force caused by the eccentricity of the disk,
It is an object of the present invention to provide a disk clamp mechanism which has a simple structure but maintains the centering with high accuracy and reliability even when used at high speed rotation, and a disk drive device provided with this disk clamp mechanism.

[0011]

In order to solve the above-mentioned problems, a turntable having a centering mechanism for centering and mounting a disk is provided, and the disk is pressed and clamped. This can be achieved by providing a means for preventing the mounted disk from skidding in a disk clamp mechanism having a clamper that performs the above operation.

The anti-skid means may be mounted on a clamper and a turntable, or on a clamper or a turntable, as in the second aspect of the invention, as in the third aspect of the invention. A plurality of elastic portions for vertically pressing the disk toward the clamper or the turntable are provided to prevent the disk from slipping on the surface of the clamper or the turntable facing the mounted disk as in the invention according to claim 5. This can be achieved by providing a zone or the like.

According to a seventh aspect of the present invention, there is provided a disk drive device provided with a turntable on which a media disk is mounted on a spindle motor and a clamper for holding the disk, the disk drive mechanism having the above-described disk clamp mechanism. This can be achieved by:

[0014]

Embodiments of the present invention will be described below based on embodiments shown in the drawings. FIG. 1 is a cross-sectional view of a main part showing a first embodiment of the disk clamp mechanism of the present invention. FIG. 2 is a perspective view showing the turntable in FIG. 1, and FIG. 3 is a perspective view showing the clamper in FIG. FIG. 4 is a cross-sectional view of a main part of the first embodiment when a disc is mounted.

Referring to FIG. 1, a turntable 4 is fixed to an end of a shaft 3 that penetrates a rotor yoke 2 of a spindle motor 1. The motor base 7 of the spindle motor 1 is fixed to a frame member (not shown) of the disk recording / reproducing apparatus. A center guide 4b for fitting a center hole of the disk is provided at the center of the disk mounting surface 4a of the turntable 4, and a ring-shaped magnet 5 is housed in a center opening of the center guide 4b. A clamper device 11 is arranged above the disk mounting surface 4a of the turntable 4. This clamper device 11
A clamper 8 is fitted with a yoke 9 in a ring shape at the center thereof, and further fixed to a clamper base 10. The clamper device 11 has a clamper support angle (not shown) of a disk recording / reproducing device fitted in an outer space between the clamper 8 and the clamper base 10 and a turntable 4 fixed to the spindle motor 1.
Is supported by its own weight in the axial direction of the shaft 3.

FIG. 2 is a perspective view showing the turntable 4 in FIG. The turntable 4 in FIG. 2 is of a multi-claw type, and has a plurality of centering claws 4 which are separated from a truncated conical center guide 4b and are movable in the radial direction.
c are arranged in the circumferential direction, and the magnet 5 is fixed in a ring shape at the center thereof. A non-slip member 6 made of rubber or synthetic resin and having a large coefficient of friction, which prevents the disk mounted on the periphery of the disk mounting surface 4a from skidding, is fixed. Instead of fixing the non-slip member 6, a structure in which a part of the disk mounting surface 4a is made convex and its upper surface is roughened to particularly increase the friction coefficient may be used.

FIG. 3 is a perspective view showing the clamper 8 shown in FIG. In FIG. 3, on a surface 8a of the clamper 8 facing the disk, a plurality of pressing arms 8b for pressing the disk in a direction perpendicular to the surface 8a are arranged in a circumferential direction. The holding arm 8b is formed integrally with the clamper 8 made of a synthetic resin and has a spring property. The holding arm 8b may be made of a material different from that of the clamper 8 and may be attached to this portion as long as the holding arm 8b has a spring property and the pressing portion does not damage the disk. A non-slip member 12 made of rubber or synthetic resin and having a large friction coefficient is fixed to the periphery of the surface 8a of the clamper 8 facing the disk, which prevents the disk from skidding. Instead of fixing the non-slip member 12, a structure may be used in which a part of the surface 8a of the clamper facing the disk is convex and the upper surface is roughened to particularly increase the friction coefficient.

FIG. 4 is a cross-sectional view of a main part of the first embodiment when a disc is mounted. The center hole 13a of the disc 13 is inserted into the upper end of the center guide 4b of the turntable, and
Is inserted into the centering claw 4c and is pushed downward by the clamper 8, so that a force is generated on the centering claw 4c to uniformly press the peripheral wall of the center hole 13a of the disk in the radial direction. At the same time, due to the attraction of the magnet 5 of the turntable 4 and the yoke 9 of the clamper device 11, the disc 13 is sandwiched between the turntable 4 and the clamper 8 and placed on the turntable 13. The disc mounted in this way is mounted coaxially with the rotation axis of the spindle motor without play.

The disc 13 is further pressed firmly against the mounting surface by the holding arm 8b of the clamper 8, thereby preventing the skid from causing the eccentricity at the time of high-speed rotation and preventing the disc 13 from having a large friction coefficient. By means of 6 and 12, it is possible to prevent a side slip which tends to make the disk 13 eccentric during high-speed rotation.

FIGS. 5 and 6 are cross-sectional views of a main part showing a second embodiment of the present invention. In FIG. 5, a turntable 14 is fixed to an end of a shaft 3 that penetrates a rotor yoke 2 of a spindle motor 1. The motor base 7 of the spindle motor 1 is fixed to a frame member (not shown) of the disk recording / reproducing apparatus. Also, at the center of the disk mounting surface 14a of the turntable 14,
Center guide 14b for fitting the center hole of the disc and centering claw 1 for centering the center hole of the disc
4c is provided, and a yoke 19 is housed in a ring shape in the central opening. A non-slip member 16 made of rubber or synthetic resin and having a large coefficient of friction for preventing a disk mounted on the periphery of the disk mounting surface 14a from skidding.
Is fixed. Instead of fixing the anti-slip member 16, a structure may be used in which a part of the disk mounting surface 14a is convex and the upper surface thereof is roughened to particularly increase the friction coefficient.

Disk mounting surface 14 of turntable 14
A clamper device 21 is disposed above “a”. The clamper device 21 has a configuration in which a magnet 15 is fitted in a ring shape at the center of the clamper 18 and further fixed to a clamper base 20. A non-slip member 22 made of rubber or synthetic resin and having a large friction coefficient is fixed to the periphery of the surface 18a of the clamper 18 facing the disk to prevent the disk from skidding. Instead of fixing the non-slip member 22, a structure in which a part of the surface 18a facing the disk is made convex and the upper surface thereof is roughened to particularly increase the friction coefficient may be used. The clamper device 21 includes a clamper supporting angle (not shown) of the disc recording / reproducing device and a clamper 18 and a clamper base 20.
The spindle motor 1 to which the turntable 14 is fixed is supported by its own weight in the axial direction of the shaft 3.

FIG. 6 is a cross-sectional view of a main part of the second embodiment when a disc is mounted. The center hole 13a of the disc 13 is inserted into the upper end of the center guide 14b of the turntable, and
a is inserted through the centering claw 14c,
When pressed downward, a force is generated in the centering claw 14c to uniformly press the peripheral wall of the center hole 13a of the disk in the radial direction. At the same time, the yoke 19 of the turntable 14 and the magnet 15 of the clamper device 21 attract,
The disc 1 is turned by the turntable 14 and the clamper 18.
3 is held and mounted on the turntable 14. The disk 13 thus mounted is mounted coaxially with the rotation axis of the spindle motor without play.

The disk 13 is a turntable 14
Is further pressed firmly against the mounting surface by the holding arm 14d to prevent side slippage which tends to cause the eccentricity at the time of high-speed rotation, and to prevent the slipping members 16 and 2 from having a large friction coefficient.
2 can prevent the skid that tends to make the disk 13 eccentric during high-speed rotation.

The above magnet and yoke may be provided on either side. Further, the structure of the turntable of the disk clamp device of the present invention has been described in the multi-claw system, but the structure provided with the anti-skid means in the center cone system is as described above.

[0025]

As described above, according to the first aspect of the present invention, a disk clamp having a turntable having a centering mechanism for centering and mounting a disk, and a clamper for pressing and holding the disk. In the mechanism, by providing means for preventing the mounted disk from skidding on the disk clamping mechanism, it is possible to prevent the mounted disk from skidding during high-speed rotation.

The anti-skid means may be mounted on a clamper and a turntable, or on a clamper or a turntable, as in the invention described in claim 2, as in the invention described in claim 3. By providing a plurality of elastic portions for vertically pressing the disk toward the clamper or the turntable, and by providing a side slip prevention zone of the disk on the surface facing the mounted disk as in the invention according to claim 5. To provide a disk clamp mechanism that solves sideslip during high-speed rotation due to the centrifugal force caused by the eccentricity of the disk, and has a simple structure even when used at high speed, but maintains the centering with high accuracy and reliability. Can be.

According to a seventh aspect of the present invention, there is provided a disk drive device provided with a turntable on which a media disk is mounted on a spindle motor and a clamper for holding the disk, the disk drive mechanism having the above-described disk clamp mechanism. This provides a disk drive that resolves sideslip during high-speed rotation due to the centrifugal force caused by the eccentricity of the disk, and has a simple structure even when used at high speed, but maintains the centering with high accuracy and reliability. it can.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a disk clamp mechanism according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing the turntable in FIG. 1;

FIG. 3 is a perspective view showing a clamper in FIG. 1;

FIG. 4 is a cross-sectional view of a main part of the disc clamp mechanism when a disc is mounted according to the first embodiment of the present invention.

FIG. 5 is a sectional view of a main part of a disk clamp mechanism according to a second embodiment of the present invention.

FIG. 6 is a cross-sectional view of a main part of a disc clamp mechanism when a disc is mounted according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spindle motor 2 Rotor yoke 3 Shaft 4 Turntable 5 Magnet 6,12 Non-slip member 7 Motor base 8 Clamp 9 Yoke 10 Clamp base 11 Clamp device

Claims (7)

[Claims] 1. A turntable having a centering mechanism for centering and mounting a disk, and a disk clamp mechanism having a clamper for holding the disk, wherein a means for preventing the mounted disk from skidding is provided. Features a disk clamp mechanism. 2. The disk clamp mechanism according to claim 1, wherein said side slip prevention means is provided on a clamper and a turntable, or on a clamper or a turntable. 3. The disk clamp mechanism according to claim 2, wherein said sideslip prevention means comprises a plurality of elastic portions for vertically pressing the mounted disk surface toward a clamper or a turntable. 4. The disk clamp mechanism according to claim 3, wherein the elastic portion to be pressed is a protrusion having a spring property provided on a surface of the clamper or the turntable facing the disk. 5. The disk clamp mechanism according to claim 2, wherein said side slip prevention means is a disk side slip prevention zone portion provided on a surface of a clamper or a turntable facing the mounted disk. 6. The disk clamp mechanism according to claim 5, wherein the side skid prevention zone portion is made of a friction material. 7. A disk drive device provided with a turntable on which a disk is mounted on a spindle motor and a clamper for holding the disk, wherein the disk drive device includes the disk clamp mechanism according to claim 1.