JP2008016138A - Slide cone, disk medium holding apparatus, spindle motor, and disk medium driving apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reliably clamp a disk and to center the disk at an accurate position. <P>SOLUTION: A slide cone 1 provided with a main body which is engaged with a hole formed at the center of the disk 8 has a first taper which is formed on this side in the direction of mounting the disk 8 at the periphery of the main body and inclined at a first angle with respect to the direction of the mounting reference surface of the disk 8, and a second taper which is formed on the depth side in the direction of mounting the disk 8 at the periphery of the main body and inclined at a second angle larger than the first angle with respect to the direction of the mounting reference surface. The friction coefficient of the surface of the first taper is made to be smaller than that of the surface of the second taper. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention uses a slide cone for fitting a hole provided in the center of a disk medium to hold the disk medium, a disk medium holding apparatus, a spindle motor using the disk medium holding apparatus, and the spindle motor. The present invention relates to a disk medium driving device.

  A disk medium such as a CD (Compact Disc) or DVD (Digital Versatile Disk) is used to read and write information by rotating a high speed with a spindle motor by fixing a hole provided in the center to a slide cone. Is going. In recent years, disk media capable of high-density recording, such as Blu-ray Disc (registered trademark of Sony Corporation), have appeared, and spindle motors that rotate the disk media at high speed and high accuracy and disk media chucking technology have become necessary. (For example, refer to Patent Document 1).

  Here, FIG. 5 shows a cross-sectional view of a spindle motor having an alignment mechanism using a slide cone. A specific function is shown in FIG. In this spindle motor, the disk 8 is moved by the force of pushing up the slide cone 1 by the coil spring 5 and the force of pushing down the clamper 9 by the suction force of the suction magnet 10 and chucking yoke 4. And the clamper 9, the centering is performed by following the diameter of the disc cone on the truncated cone of the slide cone 1.

  Finally, since the suction force of the suction magnet 10 and the chucking yoke 4 is designed to generate a larger force than the force of the coil spring 5, the disk 8 is turned by this suction force. It is pressed against the table 2 and fixed (chucked).

  As shown in FIG. 7, the slide cone 1 normally has an A portion (first taper: incoming taper) with a gentle inclination and a B portion (second taper: final taper) with a sharp inclination. In part A, the inner diameter part of the disk is generally aligned and the part B is tempted. Part B is the part where the disc is actually fixed. The disc is aligned with the tilt of the slide cone even when external force increases due to unbalance due to high-speed rotation. To prevent it from coming off.

JP 2003-346404 A

  However, the conventional configuration has the following problems. That is, part A of the slide cone has a gentle inclination, so the lateral force acting to align the disk is small. In some cases, the disk cannot be guided to part B and is clamped between part A and the clamper and fixed. It may end up. On the other hand, steep inclination of the portion A would lengthen the mechanical dimension of the disc clamping mechanism in the vertical direction, which would be contrary to the thinning of the set.

  Another method is to use a material having a smaller friction coefficient for the slide cone. However, the disadvantage is that the friction coefficient of part B is also reduced, so that the disk may come off during high-speed rotation. Note that as a countermeasure against this, it is not possible to make the inclination of the portion B more steep because there is a problem that the inner diameter of the disk is caught in the slide cone during the rotation of the disk.

  The present invention has been made to solve such problems. That is, the present invention provides a slide cone having a main body that fits into a hole provided in the center of a disk medium, provided on the front side in the direction in which the disk medium on the outer periphery of the main body is mounted, and a disk medium mounting reference surface A first taper that is inclined at a first angle with respect to the direction and a back side in the direction in which the disk medium on the outer periphery of the main body is mounted, and is larger than the first angle with respect to the direction of the mounting reference plane A second taper inclined at a second angle, and the friction coefficient of the surface of the first taper is made smaller than the friction coefficient of the surface of the second taper.

  In the present invention, when the center hole of the disk medium is fitted into the slide cone, the friction coefficient of the surface of the first taper is smaller than the friction coefficient of the surface of the second taper. The inner surface of the hole can be smoothly guided to the second taper without being caught by the first taper portion.

  The present invention also provides a slide cone having a body that is slidably attached to a shaft of a motor that rotates the disk medium, and that fits into a hole provided in the center of the disk medium, and the disk medium as a slide cone. In a disk medium holding device comprising: a clamper that presses to the side; and a spring that applies an urging force to the slide cone when the slide cone is pushed in the axial direction by the disk medium being pressed by the clamper. The first taper is provided on the front side in the direction in which the disk medium is mounted, and is inclined at a first angle with respect to the direction of the disk medium mounting reference surface, and the disk medium on the outer periphery of the main body is mounted in the mounting direction. A second taper provided on the back side and inclined at a second angle larger than the first angle with respect to the direction of the mounting reference surface. The friction coefficient of the surface of the first taper is intended to be smaller than the friction coefficient of the surface of the second taper.

  In the present invention, when the center hole of the disk medium is fitted into the slide cone, the friction coefficient of the surface of the first taper is smaller than the friction coefficient of the surface of the second taper. The inner surface of the hole can be smoothly guided to the second taper without being caught by the first taper portion, and the disk medium can be reliably held between the slide cone and the clamper. .

  The present invention also provides a slide cone having a motor having a shaft for rotating a disk medium, and a main body slidably attached to the shaft of the motor and fitted in a hole provided in the center of the disk medium. A spindle motor comprising: a clamper that presses the disk medium toward the slide cone; and a spring that applies an opposing biasing force to the slide cone when the slide cone is pushed in the axial direction by pressing the disk medium by the clamper. Is provided on the front side in the direction in which the disk medium on the outer periphery of the main body is mounted, and has a first taper inclined at a first angle with respect to the direction of the disk medium mounting reference surface, and the disk medium on the outer periphery of the main body. A second tape is provided on the back side of the mounting direction and is inclined at a second angle larger than the first angle with respect to the direction of the mounting reference plane. Includes bets, in which the friction coefficient of the surface of the first taper less than the friction coefficient of the surface of the second taper.

  In the present invention, when the center hole of the disk medium is fitted into the slide cone, the friction coefficient of the surface of the first taper is smaller than the friction coefficient of the surface of the second taper. The inner surface of the hole can be smoothly guided to the second taper without being caught by the first taper portion, and the disk medium is rotated while the disk medium is securely held between the slide cone and the clamper. To be able to.

  The present invention also provides a slide cone having a motor having a shaft for rotating a disk medium, and a main body slidably attached to the shaft of the motor and fitted in a hole provided in the center of the disk medium. A disk medium drive device comprising: a clamper that presses the disk medium toward the slide cone; and a spring that applies an urging force to the slide cone when the slide cone is pushed in the axial direction by pressing the disk medium by the clamper. A slide cone is provided on the front side in the direction in which the disk medium on the outer periphery of the main body is mounted, the first taper is inclined at a first angle with respect to the direction of the disk medium mounting reference surface, and the disk on the outer periphery of the main body A second angle provided at a depth side in the direction in which the medium is mounted and inclined at a second angle larger than the first angle with respect to the direction of the mounting reference surface And a chromatography path is for the coefficient of friction of the surface of the first taper less than the friction coefficient of the surface of the second taper.

  In the present invention, when the center hole of the disk medium is fitted into the slide cone, the friction coefficient of the surface of the first taper is smaller than the friction coefficient of the surface of the second taper. The inner surface of the hole can be smoothly guided to the second taper without being caught by the first taper portion, and the disk medium is driven while the disk medium is securely held between the slide cone and the clamper. To be able to.

  Therefore, the present invention has the following effects. That is, since the disk can be aligned at an accurate position, it can be prevented that the disk is clamped in an eccentric state. In addition, it is possible to make it difficult to remove the clamped disc even when the external force due to unbalance increases at high speed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view illustrating a disk medium holding device according to the present embodiment, and FIG. 2 is a cross-sectional view illustrating a slide cone of the disk medium holding device according to the present embodiment.

  That is, the disk medium holding device according to the present embodiment includes a slide cone 1 that fits into a hole provided in the center of a disk (disk medium) 8, and a rotor 7 that rotates the disk 8 fixed by the slide cone 1. A stator 6 corresponding to the rotor 7, a clamper 9 that presses the disk 8 toward the slide cone 1, and a coil spring 5 that biases the slide cone 1 toward the clamper 9.

  The slide cone 1 is slidably attached to the shaft 3 of the spindle motor. When the disk 8 is pressed by the clamper 9, the slide cone 1 is pushed into the motor rotor 7 side. Since the slide cone 1 can slide with respect to the shaft 3, a clearance of several μm on one side is provided between the central hole of the slide cone 1 and the shaft 3.

  A chucking yoke 4 is attached to the tip of the shaft 3 by press-fitting, and the clamper 9 is attracted by a magnetic force with the attraction magnet 10 provided on the clamper 9. When the clamper 9 is attracted to the chuck yoke 4 and the slide cone 1 is pushed in, the disk 8 is sandwiched between the clamper 9 and the turntable 2, and the disk 8 is also rotated by the rotation of the rotor 6.

  In such a disk medium holding device, the present embodiment is characterized by the taper portion of the slide cone 1 that is aligned with the hole of the disk 8 for alignment. That is, the spindle motor that rotates the disk 8 is positioned inside the turntable 2 on which the disk 8 is mounted, is in contact with the inner diameter of the hole of the disk 8, and aligns the rotation center of the disk 8 with the rotation center of the motor (alignment). In the slide cone 1 that is provided in order to move in the axial direction of the motor, the friction coefficient of the surface in contact with the inner diameter of the hole of the disk 8 is reduced at the portion that is roughly aligned, and the portion that is aligned with high accuracy The feature is that it has been enlarged.

  FIG. 3 is a cross-sectional view illustrating features of the slide cone of the present embodiment. The characteristic slide cone 1 of the present embodiment is provided on the front side in the direction (vertical direction in the figure) in which the disk on the outer periphery of the main body is mounted, and with respect to the direction of the disk mounting reference plane (lateral direction in the figure). A portion (first taper: incoming taper) that is inclined at a first angle and a rear side in the direction in which the disk on the outer periphery of the main body is mounted, and from the first angle with respect to the direction of the mounting reference plane B portion (second taper: final taper) that is inclined at a larger second angle, and the friction coefficient of the surface of this A portion is made smaller than the friction coefficient of the surface of B portion.

  More specifically, the friction coefficient can be reduced with respect to the surface of the B portion by subjecting the surface of the A portion to a texture or fine unevenness. As a result, when the disc is fitted to the slide cone 1, even if the corner portion of the center hole of the disc contacts the A portion, the friction coefficient is small so that it is difficult to be caught and can be smoothly guided to the B portion. become.

  That is, when the disc 8 is sandwiched and held between the clamper 9 and the turntable 2 shown in FIG. 2, the center hole of the disc 8 is roughly aligned at the A portion of the slide cone 1 and guided to the B portion. And by aligning with B part, exact alignment and holding | maintenance can be performed. In such a clamping and alignment operation of the disk 8, even if the position of the hole of the disk is slightly deviated before the disk 8 is clamped, the misalignment is corrected by the inclination of the A part and can be guided to the B part. It has become.

  However, if the position of the disk 8 is large or the disk 8 tries to enter obliquely, the corner of the inner surface of the hole of the disk is caught by the A portion, and the disk is clamped as it is, so-called mischucking occurs. Become.

  In this embodiment, since the process of reducing the friction coefficient of the portion A is performed, the disc 8 has a large positional deviation or the disc 8 tends to enter obliquely, and the corner portion of the inner surface of the hole of the disc 8 is A. Even if it comes into contact with the portion, the disc 8 can be guided accurately to the B portion by smoothly guiding along the inclination of the A portion. For this reason, it is possible to prevent the occurrence of a problem that the disk is sandwiched between the A part and the clamper without being guided to the B part and fixed.

  Furthermore, since the surface of the B portion has a larger coefficient of friction than the surface of the A portion, when the central hole of the disc 8 is fitted and fixed to the B portion, the disc 8 can be reliably fixed by the frictional force, and the high speed It is possible to make it difficult to remove the disk 8 even during rotation.

  Here, although the specific friction coefficient of the A part and the B part of the slide cone 1 varies depending on various design matters, the smooth disk 8 is called in the A part as described above, and the B part is in the B part. Any value can be used as long as the fixing of the disk 8 can be surely performed. For example, the friction coefficient of the A part with respect to the friction coefficient of the B part applied in the general manufacture of the slide cone for aligning the disk 1. The effect by said A part can be acquired by making small. Further, in the slide cone 1 in which the friction coefficient of the A part is reduced, the friction coefficient of the B part in the slide cone 1 of the present embodiment is made larger than the friction coefficient of the B part applied in the manufacture of the above general slide cone. Thereby, the effect by the said A part and B part can be obtained.

  FIG. 4 is a cross-sectional view for explaining another example of the slide cone of the present embodiment. The appearance of the slide cone 1 is the same as that of the slide cone shown in FIG. That is, the A section provided on the front side in the direction in which the disk on the outer periphery of the main body is mounted (vertical direction in the figure) and inclined at a first angle with respect to the direction of the disk mounting reference plane (lateral direction in the figure) (First taper) and a B portion (first taper) provided on the back side in the direction in which the disk on the outer periphery of the main body is mounted and inclined at a second angle larger than the first angle with respect to the direction of the mounting reference surface 2 taper).

  In another example shown in FIG. 4, in order to make the friction coefficient of the A part smaller than that of the B part, a material having a smaller friction coefficient is used for the A part, and a material having a larger friction coefficient than the A part is used for the B part. I use it. Thereby, the effect similar to the structure of the slide cone shown in FIG. 3 can be given.

  Here, when the material is changed between the A part and the B part in the slide cone 1, the connection between the A part and the B part can be realized by adhesion, press-fitting, caulking, two-color molding, or the like.

  In addition to the embodiment described above, as a process for reducing the friction coefficient of the A part, a coating film for reducing the friction coefficient of a fluororesin or the like may be applied to the surface of the A part of the slide cone 1. As a result, similarly to the above, it is possible to suppress the catching of the disk at the portion A and perform smooth calling.

  What has been described above shows an example in which the inclination of the slide cone is two steps. Even if a multi-step or curved line is drawn, the surface that finally clamps the disc and the surface that leads to that position It is clear that the above-mentioned effect can be obtained by changing the friction coefficient, and such a structure is also included in the present invention.

  The disk medium holding device according to the embodiment described above may be configured as a spindle motor including the slide cone 1, the coil spring 5, the turntable 2, and the chuck yoke 4. In addition, this disk medium holding device is applied as a drive mechanism (disk medium drive device) of a device that records and reproduces disk media, and is stable as a drive mechanism of a large-capacity recording medium such as a Blu-ray disc (registered trademark of Sony Corporation). Thus, it is possible to perform chucking and highly accurate disk alignment.

It is sectional drawing explaining the disk medium holding | maintenance apparatus which concerns on this embodiment. It is sectional drawing explaining the slide cone of the disc medium holding | maintenance apparatus which concerns on this embodiment. It is sectional drawing explaining the characteristic of the slide cone of this embodiment. It is sectional drawing explaining another example of the slide cone of this embodiment. It is sectional drawing of the conventional spindle motor with the alignment mechanism which uses a slide cone. It is sectional drawing explaining the function of a slide cone. It is sectional drawing explaining the structure of the conventional slide cone.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Slide cone, 2 ... Turntable, 3 ... Axis, 4 ... Chucking yoke, 5 ... Coil spring, 6 ... Stator, 7 ... Rotor, 8 ... Disc, 9 ... Clamper, 10 ... Suction magnet

Claims (7)

In a slide cone provided with a main body that fits into a hole provided in the center of the disk medium,
A first taper provided on a front side of the outer periphery of the main body in a direction in which the disk medium is mounted, and inclined at a first angle with respect to a direction of a mounting reference surface of the disk medium;
A second taper provided on the outer side of the outer periphery of the main body in the direction in which the disk medium is mounted, and inclined at a second angle larger than the first angle with respect to the direction of the mounting reference surface. And
The slide cone characterized by making the friction coefficient of the surface of said 1st taper smaller than the friction coefficient of the surface of said 2nd taper. The slide cone according to claim 1, wherein the surface of the first taper is textured. The slide cone according to claim 1, wherein the first tapered portion and the second tapered portion of the main body are made of different materials. The slide cone according to claim 1, wherein a coating film is applied to a surface of the first taper. A slide cone that is slidably attached to the shaft of a motor that rotates the disk medium, and has a main body that fits into a hole provided in the center of the disk medium;
A clamper for pressing the disk medium toward the slide cone;
In a disk medium holding device comprising: a spring that applies an urging force to the slide cone when the slide cone is pushed in the axial direction by pressing the disk medium by the clamper;
The slide cone is
A first taper provided on a front side of the outer periphery of the main body in a direction in which the disk medium is mounted, and inclined at a first angle with respect to a direction of a mounting reference surface of the disk medium;
A second taper provided on the outer side of the outer periphery of the main body in the direction in which the disk medium is mounted, and inclined at a second angle larger than the first angle with respect to the direction of the mounting reference surface. And
The disk medium holding device, wherein the friction coefficient of the surface of the first taper is smaller than the friction coefficient of the surface of the second taper. A motor having a shaft for rotating a disk medium;
A slide cone that is slidably attached to the shaft of the motor and has a main body that fits into a hole provided in the center of the disk medium;
A clamper for pressing the disk medium toward the slide cone;
In a spindle motor comprising: a spring that applies an urging force to the slide cone when the slide cone is pushed in the axial direction by the pressing of the disk medium by the clamper;
The slide cone is
A first taper provided on a front side of the outer periphery of the main body in a direction in which the disk medium is mounted, and inclined at a first angle with respect to a direction of a mounting reference surface of the disk medium;
A second taper provided on the outer side of the outer periphery of the main body in the direction in which the disk medium is mounted, and inclined at a second angle larger than the first angle with respect to the direction of the mounting reference surface. And
A spindle motor, wherein a friction coefficient of a surface of the first taper is smaller than a friction coefficient of a surface of the second taper. A motor having a shaft for rotating a disk medium;
A slide cone that is slidably attached to the shaft of the motor and has a main body that fits into a hole provided in the center of the disk medium;
A clamper for pressing the disk medium toward the slide cone;
In a disk medium driving device comprising: a spring that applies an urging force facing the slide cone when the slide cone is pushed in the axial direction by pressing the disk medium by the clamper;
The slide cone is
A first taper provided on a front side of the outer periphery of the main body in a direction in which the disk medium is mounted, and inclined at a first angle with respect to a direction of a mounting reference surface of the disk medium;
A second taper provided on the outer side of the outer periphery of the main body in the direction in which the disk medium is mounted, and inclined at a second angle larger than the first angle with respect to the direction of the mounting reference surface. And
The disk medium driving device characterized in that the friction coefficient of the surface of the first taper is smaller than the friction coefficient of the surface of the second taper.

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