JP2008016119A - Chucking ring, disk medium holding device, spindle motor, and disk medium driving device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reliable disk alignment mechanism capable of preventing the mis-clamping of a disk and chucking erroneous operation. <P>SOLUTION: In the chucking ring 11 having a body fitted into a hole formed at the center of the disk, the chucking ring includes a leading taper 20 provided at the front side of the outer circumference of the body at this side in a direction in which the disk is mounted and inclined at a first angle with respect to the direction of a disk mounting reference plane; a final taper 21 provided at the deeper side of the outer circumference of the body of the direction in which the disk is mounted and inclined at a second angle larger than the first angle with respect to the direction of the mounting reference plane; and an intermediate taper 22 provided between the leading taper 20 and the final taper 21 at the outer circumference of the body and inclined at a third angle between the first angle and the second angle with respect to the direction of the mounting reference plane. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a chucking ring for holding a disk medium by fitting with a hole provided in the center of 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 apparatus.

Disc media such as CDs (Compact Discs) and DVDs (Digital Versatile Disks) are read and written by rotating a high speed with a spindle motor by fixing a hole provided in the center to a chucking ring. It is carried out. In recent years, disk media capable of high-density recording such as Blu-ray Disc (registered trademark of Sony Corporation) have also 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).

  FIG. 5 is a cross-sectional view illustrating a conventional disk medium holding device, and FIG. 6 is a cross-sectional view illustrating a chucking ring of the conventional disk medium holding device. That is, this disk medium holding device includes a chucking ring 11 that fits into a hole provided in the center of a disk (disk medium) 14, a motor rotor 17 that rotates the disk 14 fixed by the chucking ring 11, and a disk. A clamper 15 that presses 14 toward the chucking ring 11 and a chucking spring 12 that biases the chucking ring 11 toward the clamper 15 are provided.

  The chucking ring 11 is slidably attached to the shaft 13 of the motor, and is pushed into the motor rotor 17 side when the disc 14 is pressed by the clamper 15. A chuck boss 19 made of a magnet is attached to the tip of the shaft 13, and the clamper 15 is attracted by this magnetic force. When the clamper 15 is attracted to the chuck boss 19 and the chucking ring 11 is pushed in, the disk 14 is sandwiched between the clamper 15 and the turntable 16, and the disk 14 is also rotated by the rotation of the motor rotor 17.

In such a disk medium holding device, there are the following standard differences between when the disk 14 is a DVD and when it is a Blu-ray disk (registered trademark of Sony Corporation).
・ Recording capacity: DVD: 4.7 GB, Blu-ray Disc: 25 GB
Track pitch: DVD: 0.74 μm, Blu-ray disc: 0.32 μm
・ Work distance (focus gap) ... DVD: 0.5mm, Blu-ray Disc: 0.26mm
・ Centering accuracy (chucking shake)… DVD: 100 μmpp or less, Blu-ray Disc: 35 μmpp or less

  As described above, a Blu-ray disc (registered trademark of Sony Corporation) is required to have a very high accuracy for holding a disc medium as well as an improvement in recording density.

  Here, as shown in FIG. 6, the conventional chucking ring 11 is provided with a calling taper (first taper) 20 on the front side in the mounting direction of the disk 14 on the outer periphery of the main body, and a final taper on the back side in the mounting direction. A (second taper) 21 is provided. The call-in taper 20 calls the hole by sliding the hole of the disk 14 when the disk 14 is mounted, and has a small inclination with respect to the mounting reference plane direction. On the other hand, the final taper 21 aligns the disk 14 by fitting with the hole of the disk 14 called by the calling taper 20, and has a larger inclination than the calling taper 20 in the direction of the mounting reference surface. Have. When the hole of the disk 14 is fitted to the final taper 21, the pushed-in disk 14 finally remains.

JP 2003-346404 A

  However, the conventional disk medium holding device has the following problems. That is, as shown in FIGS. 7 and 8, the disk 14 may be inclined and inserted into the chucking ring 11. At this time, one side of the disk 14 is fixed by friction with the friction sheet 19, so that the inner diameter edge on the opposite side of the disk 14 slides on the incoming taper 20 but does not slide to the final taper 21 surface. The taper 21 may stop around the intersection. In this case, the disk 14 cannot be clamped, resulting in misclamping.

  As a countermeasure against the problem that the inner diameter edge of the disk 14 stops at the surface of the incoming taper 20, as shown in FIG. 9, the angle of the surface of the incoming taper 20 is abrupt and the inner edge of the disk 14 is changed to the final taper 21. There is an idea to make it easier to slip into the surface. At this time, the position of the intersection of the incoming taper 20 and the final taper 21 is lowered, so that the position of the final taper 21 is also lowered by A as shown in FIG.

  On the other hand, the required stroke amount of the chucking ring 11 is determined from the design structure, and the operating stroke is set with a margin (see FIG. 7). However, if the countermeasure plan shown in FIG. 9 is applied, in addition to the required stroke amount in the operating stroke shown in FIG. 7, A is required, and there is no room for the operating stroke.

  The present invention has been made to solve such problems. That is, the present invention provides a chucking ring including a main body that fits into a hole provided in the center of the disk medium, and is provided on the front side of the outer periphery of the main body in the direction in which the disk medium is mounted. An inward taper inclined at a first angle with respect to the direction of the reference plane and a back side in the direction in which the disk medium on the outer periphery of the main body is mounted, and more than the first angle with respect to the direction of the mounting reference plane A final taper that is inclined to a large second angle, and a peripheral taper and a final taper on the outer periphery of the main body, and is between the first angle and the second angle with respect to the direction of the mounting reference surface. An intermediate taper inclined at a third angle.

  In the present invention, since the intermediate taper is provided between the incoming taper provided on the outer periphery of the main body of the chucking ring and the final taper, even if the disk medium is mounted obliquely with respect to the incoming taper, The edge of the inner surface of the central hole of the medium is fed from the intermediate taper to the final taper without being caught by the incoming taper, and mischucking can be suppressed.

  In addition, the present invention provides a chucking ring having a main body that is slidably attached to a shaft of a motor that rotates a disk medium, and that fits into a hole provided in the center of the disk medium, and a disk medium. A disk medium holding apparatus comprising: a clamper that presses toward the chucking ring; and a spring that applies an opposing biasing force to the chucking ring when the chucking ring is pushed in the axial direction by pressing the disk medium by the clamper. A king ring 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 a calling taper that is inclined at a first angle with respect to the direction of the disk medium mounting reference surface, and a disk medium on the outer periphery of the main body A second angle that is provided on the back side in the direction in which the is mounted and is larger than the first angle with respect to the direction of the mounting reference plane Inclined at a third angle between the first angle and the second angle with respect to the direction of the mounting reference surface, provided between the final taper that is inclined and the incoming taper and the final taper on the outer periphery of the main body. And an intermediate taper.

  In the present invention, since the intermediate taper is provided between the incoming taper provided on the outer periphery of the main body of the chucking ring and the final taper, even if the disk medium is mounted obliquely with respect to the incoming taper, The inner edge of the inner hole of the central hole of the medium is fed from the intermediate taper to the final taper without being caught by the incoming taper, so that the disk medium can be securely held between the chucking ring and the clamper. .

  Further, the present invention provides a chuck having a motor having a shaft for rotating a disk medium, and a main body that is slidably attached to the shaft of the motor and fits into a hole provided in the center of the disk medium. A spindle motor comprising: a ring; a clamper that presses the disk medium toward the chucking ring; and a spring that applies an opposing biasing force to the chucking ring when the chucking ring is pushed in the axial direction by pressing the disk medium by the clamper The chucking ring is provided on the front side of the outer periphery of the main body in the direction in which the disk medium is mounted, and the incoming taper is inclined at a first angle with respect to the direction of the disk medium mounting reference surface; Provided on the back side in the direction in which the outer peripheral disk medium is mounted, and larger than the first angle with respect to the direction of the mounting reference plane. A final taper inclined to the second angle, a pull-in taper on the outer periphery of the main body, and a final taper, between the first angle and the second angle with respect to the direction of the mounting reference surface. And an intermediate taper inclined at an angle of three.

  In the present invention, since the intermediate taper is provided between the incoming taper provided on the outer periphery of the main body of the chucking ring and the final taper, even if the disk medium is mounted obliquely with respect to the incoming taper, The inner edge of the hole in the center hole of the medium is fed from the intermediate taper to the final taper without being caught by the incoming taper, and the disk medium is rotated while the disk medium is securely held between the chucking ring and the clamper. To be able to.

  Further, the present invention provides a chuck having a motor having a shaft for rotating a disk medium, and a main body that is slidably attached to the shaft of the motor and fits into a hole provided in the center of the disk medium. A disk medium comprising: a ring; a clamper that presses the disk medium toward the chucking ring; and a spring that applies an urging force that opposes the chucking ring when the chucking ring is pushed in the axial direction by pressing the disk medium by the clamper. In the driving device, the chucking ring 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 the incoming taper is inclined at a first angle with respect to the direction of the disk medium mounting reference surface; It is provided on the back side in the direction in which the disk medium on the outer periphery of the main body is mounted, and is more than the first angle with respect to the direction of the mounting reference plane. A final taper inclined at a second threshold angle, and a leading taper and a final taper on the outer periphery of the main body, and between the first angle and the second angle with respect to the direction of the mounting reference surface An intermediate taper inclined at a third angle.

  In the present invention, since the intermediate taper is provided between the incoming taper provided on the outer periphery of the main body of the chucking ring and the final taper, even if the disk medium is mounted obliquely with respect to the incoming taper, The edge of the inner surface of the hole in the center of the medium is fed from the intermediate taper to the final taper without being caught by the incoming taper, and the disk medium is driven with the disk medium securely held between the chucking ring and the clamper. To be able to.

  Therefore, the present invention has the following effects. In other words, since the disk medium is not easily caught by the tapering surface of the chucking ring during disk alignment operation, it becomes a highly reliable disk alignment mechanism with few misclamping and chucking malfunctions, and alignment accuracy can be improved. It becomes. In addition, since the alignment accuracy is improved, in the optical disk drive, signal read / write errors are reduced during recording and reproduction, and it is possible to provide a highly reliable optical disk drive apparatus.

  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 chucking ring of the disk medium holding device according to the present embodiment.

  That is, the disk medium holding device according to this embodiment includes a chucking ring 11 that fits into a hole provided in the center of a disk (disk medium) 14 and a motor rotor that rotates the disk 14 fixed by the chucking ring 11. 17, a clamper 15 that presses the disk 14 toward the chucking ring 11, and a chucking spring 12 that biases the chucking ring 11 toward the clamper 15.

  The chucking ring 11 is slidably attached to the spindle motor shaft 13, and is pushed into the motor rotor 17 side when the disk 14 is pressed by the clamper 15. Since the chucking ring 11 can slide with respect to the shaft 13, a clearance of several μm on one side is provided between the hole 11 a of the chucking ring 11 and the shaft 13.

  A chuck boss 19 made of a magnet is attached to the tip of the shaft 13 by press fitting, and the clamper 15 is attracted by this magnetic force. When the clamper 15 is attracted to the chuck boss 19 and the chucking ring 11 is pushed in, the disk 14 is sandwiched between the clamper 15 and the turntable 16, and the disk 14 is also rotated by the rotation of the motor rotor 17.

  The present embodiment is characterized in that an intermediate taper 22 is provided between the incoming taper 20 and the final taper 21 as the chucking ring 11 used in such a disk medium holding device. As shown in FIG. 2, the main body of the chucking ring 11 is manufactured, for example, by resin molding, and can be aligned with a hole provided in the center of the disk 14. It is like that.

  On the outer periphery of the main body of the chucking ring 11, a calling taper (first taper) 20 that is inclined at a first angle is provided on the front side in the direction in which the disk 14 is mounted (hereinafter referred to as “mounting direction”). A final taper (second taper) 21 that is inclined at a second angle is provided on the back side in the mounting direction. In the present embodiment, an intermediate taper 22 that is inclined at an angle between the first angle and the second angle (third angle) is provided between the incoming taper 20 and the final taper 21.

  The first angle provided in the incoming taper 20 is a smaller (loose) angle with respect to the direction of the mounting reference plane of the disk 14 (direction perpendicular to the mounting direction), and is provided at the center of the disk 14. Even if the formed holes are displaced, they are easily drawn by the inclination of the drawing taper 20.

  Further, the second angle provided in the final taper 21 is larger (steep) than the first angle of the pull-in taper 20, and an error in the inner diameter of the hole provided in the center of the disk 14 is taken into consideration. It is an angle. By setting the second angle of the final taper 21 and the external dimension of the final taper 21, the hole of the disk 14 is surely fitted somewhere in the final taper 21. The alignment accuracy of the disk 14 is determined by the fitting of the disk 14 at the final taper 21.

  The intermediate taper 22 provided between the incoming taper 20 and the final taper 21 is set to a third angle that is between the first angle and the second angle. By providing the intermediate taper 22, even when the disk 14 is mounted obliquely, the inner edge of the hole of the disk 14 does not get caught by the terminal end portion of the calling taper 20, and the intermediate taper 22 can be reliably connected. It is possible to call up to the final taper 21.

  FIG. 3 is a diagram illustrating an example of dimensions of each taper of the chucking ring according to the present embodiment. This figure shows an example of the height of each taper along the mounting direction (vertical direction in the figure) and the inclination angle of each taper with respect to the direction of the disk mounting reference surface (lateral direction in the figure).

  In the example shown in FIG. 3, the height of the calling taper 20 is 0.6 cm, the inclination angle is 25 °, the height of the final taper 21 is 0.93 cm, and the inclination angle is 75 °. The height is 0.72 cm and the inclination angle is 41 °.

  The intermediate taper 22 has an angle between the incoming taper 20 and the final taper 21, but is closer to the incoming taper 20 (the angle of the incoming taper 20 than the intermediate angle between the incoming taper 20 and the final taper 21. It is desirable to be close. As a result, the angle per intersection between the incoming taper 20 and the intermediate taper 22 can be made moderate, and it becomes easy to prevent the inner edge of the hole of the disk 14 from being caught.

  In addition, the height and inclination angle of each taper shown in FIG. 3 are examples, and may be appropriately set so as to fulfill each role.

  FIG. 4 is a schematic cross-sectional view for explaining the operation when the disk is mounted obliquely on the chucking ring of this embodiment. By providing the intermediate taper 22 on the outer periphery of the main body of the chucking ring 11, the inner diameter edge of the central hole of the disk 14 is prevented from riding on the end of the incoming taper 20, and the final taper 21 is transmitted along the intermediate taper 22. It becomes easy to slip in.

  Conventionally, as shown in FIG. 8, when the disk 14 is mounted obliquely on the chucking ring 11, the inner edge of the hole of the disk 14 is caught around the intersection of the incoming taper 20 and the final taper 21. This causes mischucking.

  By providing the intermediate taper 22 between the incoming taper 20 and the final taper 21 as in this embodiment, even if the disk 14 is mounted obliquely, the inner diameter edge of the hole is not caught and is transmitted through the intermediate taper 22. Thus, it is smoothly guided to the final taper 21.

  Further, unlike the present embodiment, by providing the intermediate taper 22 between the incoming taper 20 and the final taper 21, no countermeasure (see FIG. 9) by making the inclination angle of the incoming taper 20 steep is required. Further, since the position of the final taper 21 is not lowered, the extension of the stroke (see A in the figure) as shown in FIG. 9 does not occur. Thereby, the thickness reduction of the chucking ring 11 can be maintained.

  Further, due to the action of the intermediate taper 22 as described above, since the stroke of the chucking ring 11 is sufficient, the sliding operation can be stabilized, misclamping and malfunction can be suppressed, and the disc alignment operation can be stabilized. it can.

  In addition, the chucking ring 11 of the present embodiment is manufactured by molding with resin, but the surface of the intermediate taper 22 may be subjected to embossing or fine uneven processing. As a result, when the disk 14 is called in, the contact area of the disk 14 at the intermediate taper 22 can be reduced to reduce the contact resistance, and the sliding can be further improved and reliably led to the final taper 21.

  The disk medium holding device according to the above-described embodiment may be configured as a spindle motor including the chucking ring 11, the chucking spring 12, the turntable 16, and the chuck boss 19. 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 chucking ring of the disc medium holding | maintenance apparatus which concerns on this embodiment. It is a figure explaining an example of the dimension of each taper of the chucking ring concerning this embodiment. It is a schematic cross-sectional view for explaining the operation when a disk is mounted obliquely on the chucking ring of the present embodiment. It is sectional drawing explaining the conventional disc medium holding | maintenance apparatus. It is sectional drawing explaining the chucking ring of the conventional disc medium holding | maintenance apparatus. It is sectional drawing (the 1) explaining a state when a disc is mounted inclining. It is sectional drawing (the 2) explaining a state when a disc is inclined and mounted | worn. It is sectional drawing explaining the example of a conventional countermeasure.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Chucking ring, 11a ... Hole, 11b ... Recessed part, 12 ... Chucking spring, 13 ... Shaft, 14 ... Disc, 15 ... Clamper, 16 ... Turntable, 17 ... Motor rotor, 18 ... Motor stator, 20 ... Calling taper , 21 ... Final taper, 22 ... Intermediate taper

Claims (6)

In the chucking ring comprising a body that fits into a hole provided in the center of the disk medium,
A calling taper provided on the 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 the direction of the mounting reference surface of the disk medium;
A final 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;
Provided between the leading taper and the final taper on the outer periphery of the main body, and inclined at a third angle between the first angle and the second angle with respect to the direction of the mounting reference surface A chucking ring comprising an intermediate taper. The chucking ring according to claim 1, wherein the third angle is closer to the first angle than the second angle. The chucking ring according to claim 1, wherein a surface of the intermediate taper is textured. A chucking ring 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;
A clamper for pressing the disk medium toward the chucking ring;
A disk medium holding device comprising: a spring that applies an urging force to the chucking ring when the chucking ring is pushed in the axial direction by the pressing of the disk medium by the clamper;
The chucking ring is
A calling taper provided on the 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 the direction of the mounting reference surface of the disk medium;
A final 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;
An intermediate taper provided between the leading taper and the final taper on the outer periphery of the main body, and inclined at a third angle between the first angle and the second angle with respect to the direction; A disk medium holding device comprising: A motor having a shaft for rotating a disk medium;
A chucking ring having a body that is slidably attached to the shaft of the motor and that fits into a hole provided in the center of the disk medium;
A clamper for pressing the disk medium toward the chucking ring;
A spindle motor comprising: a spring that applies an urging force that opposes the chucking ring when the chucking ring is pushed in the axial direction by the pressing of the disk medium by the clamper;
The chucking ring is
A calling taper provided on the 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 the direction of the mounting reference surface of the disk medium;
A final 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;
An intermediate taper provided between the leading taper and the final taper on the outer periphery of the main body, and inclined at a third angle between the first angle and the second angle with respect to the direction; A spindle motor characterized by comprising: A motor having a shaft for rotating a disk medium;
A chucking ring having a body that is slidably attached to the shaft of the motor and that fits into a hole provided in the center of the disk medium;
A clamper for pressing the disk medium toward the chucking ring;
A disk medium driving device comprising: a spring that applies an urging force facing the chucking ring when the chucking ring is pushed in the axial direction by the pressing of the disk medium by the clamper;
The chucking ring is
A calling taper provided on the 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 the direction of the mounting reference surface of the disk medium;
A final 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;
Provided between the leading taper and the final taper on the outer periphery of the main body, and inclined at a third angle between the first angle and the second angle with respect to the direction of the mounting reference surface A disk medium driving device comprising an intermediate taper.

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