JP2006185472A - Disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disk device capable of accurately correcting the positional shift of a disk center and preventing the eccentricity of the rotated disk even if the disk is mounted on a turntable in an unmatched state between the disk center and the rotational center of the turntable. <P>SOLUTION: A helical groove 8 is formed at a support shaft 7 formed in the center of the turntable 2, and the engagement part 20 of a movable hub 15 having a tapered part 19 is freely slidably engaged with the groove 8. When a disk 23 is loaded, even if a center hole 24 abuts on the tapered part 19 in an eccentric state, the movable hub 15 is rotated around a center I-I to descend without tilting with respect to a spindle shaft 13. Thus, at the time of mounting the disk 23 on the turntable 2, the center hole 24 is guided by the tapered part 19 so that the center positional shift of the disk 23 is surely corrected, and the eccentricity of the rotated disk 23 is prevented. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a disk device used in an in-vehicle electronic device, a home electronic device, a personal computer, and the like, and in particular, aligns the disk by providing a movable hub that can move up and down on a turntable. The present invention relates to a disk device capable of recording.

  In a conventional disk device, the center diameter of a disk such as a CD (compact disk) or DVD (digital versatile disk) varies, resulting in misalignment between the center of the disk and the rotation center of the turntable. There was a problem that the disc inside was eccentric.

  In order to solve this problem, there is provided a movable hub that has a tapered portion that slides in contact with the inner edge of the center hole of the disk, and that can move in the vertical direction along the rotation center axis of the turntable. There has been proposed a disk device having a configuration capable of correcting the center misalignment. The following Patent Document 1 discloses this type of disk device.

  In FIG. 1 of Patent Document 1, a turntable 14 fixed to a motor shaft 22 via a bearing portion 26 is rotatably installed by a motor 12, and a disk guide 16 (movable hub) is provided inside the turntable 14. There is disclosed a configuration in which a bearing portion 36 that is provided and formed integrally with the disk guide 16 is slidably inserted into the motor shaft 22.

  A coil spring 20 is installed between a spring receiving portion 28 provided on the upper portion of the bearing portion 26 and a spring abutting portion 38 provided on the upper portion of the bearing portion 36, and the disk guide 16 is connected to the coil spring 20. As a result of this action, it is biased upward away from the turntable 14 along the axis of the motor shaft 22.

When the disc 18 is placed on the turntable 14, the center hole of the disc 18 is inserted into the vertical portion 44 formed in the disc guide 16, and then the taper portion 46 expands downward at a predetermined angle. Make sliding contact. At this time, the disk guide 16 is guided by the motor shaft 22 and moved downward. At the same time, the center hole of the disk 18 is guided by the taper portion 46, so that the positions of the rotation centers of both the disk 18 and the turntable 14 are changed. Corrected to match. As a result, eccentricity of the rotating disk 18 can be prevented.
JP 2000-30329 A

  However, in the disk device disclosed in Patent Document 1 described above, if the bearing portion 36 and the motor shaft 22 are loosely fitted, the disk guide 16 accurately aligns the center of rotation of the disk 18. There are times when it is not.

  For example, when the disk 18 is to be placed on the turntable 14 in a state where the rotation centers of the disk 18 and the turntable 14 do not coincide with each other, the center hole of the disk 18 is eccentrically slidably contacted with the tapered portion 46. For this reason, the disc guide 16 is biased to a posture inclined with respect to the motor shaft 22 and may be guided downward along the motor shaft 22 while maintaining this inclined posture.

  If the attitude of the disk guide 16 is inclined, the taper portion 46 cannot make the center of the disk 18 coincide with the rotation center of the turntable 14, and the eccentricity of the disk 18 cannot be prevented. In particular, when the length of the bearing portion 36 cannot be sufficiently secured due to the thinning of the entire disk device, the disk guide 16 is easily tilted.

  The present invention solves the above-mentioned conventional problems, and even when the disc is placed on the turntable in a state where the center of the disc and the rotation center of the turntable do not coincide with each other, the disc center position shifts. It is an object of the present invention to provide a disk device that can accurately correct the rotation and prevent eccentricity of a rotating disk.

The present invention has a motor provided with a spindle shaft and a turntable fixed to the spindle shaft for rotation, and a disk device for rotating the disk by placing the disk on a mounting portion formed on the turntable. In
The turntable is provided with a support shaft that is coaxial with the spindle shaft and has a spiral groove formed in the periphery thereof, and the support shaft has a tapered portion that slides in contact with the center hole of the disc and positions the disc. And a movable hub having an engaging portion that slides in the groove is supported so as to be vertically movable while rotating along the support shaft, and the movable hub is interposed between the turntable and the movable hub. An urging member for urging the hub upward is provided.

  In the above configuration, when the disc is about to be placed on the turntable in a state where the center of the disc and the rotation center of the turntable do not coincide with each other, the center hole of the disc abuts the taper portion, so that the movable hub is Move down. At this time, the movable hub descends while rotating around the spindle axis without being inclined with respect to the spindle axis by the action of the spiral groove part and the engaging part sliding in the groove part. Therefore, when the disk is placed on the turntable, the center hole of the disk is guided by the taper portion, and the misalignment of the center is surely corrected, and the eccentricity of the rotating disk can be prevented.

In the above configuration, the support shaft can be formed integrally with the turntable or the spindle shaft.
With this configuration, it is possible to suppress an increase in the number of parts.

In the above configuration, it is preferable that a sliding member is interposed between at least one of the biasing member and the turntable and between the biasing member and the movable hub.
If comprised in this way, the friction between an urging member and a turntable and / or between a movable hub and an urging member can be reduced, and a movable hub can be operated more smoothly.

  In the present invention, even when the disc is about to be placed on the turntable in a state where the center of the disc and the rotation center of the turntable do not coincide with each other, the positional deviation of the center of the disc can be accurately corrected, The eccentricity of the rotating disk can be prevented.

  1 is a perspective view showing a disk device according to an embodiment of the present invention, FIG. 2 is a side view thereof, FIG. 3 is an exploded perspective view thereof, FIG. 4 is an exploded side sectional view thereof, and FIG. FIG. 6 is a perspective view of a movable hub, and FIG. 7 is an exploded side sectional view showing a second embodiment. In the figure, arrows Y1-Y2 indicate the vertical direction of the turntable 2, and also indicate the moving direction of the movable hub 15. An axis II indicates the rotation center of the turntable 2 and the spindle shaft 13.

  The disk device of the present embodiment shown in FIGS. 1 to 6 includes a motor 11 and a turntable unit 1 on which a disk 23 is placed. As shown in FIG. 4, the motor 11 has a motor body 12 and a spindle shaft 13 formed of a cylindrical shaft body rotatably supported by the motor body 12. ) Is installed in a state of protruding from the motor body 12.

  As shown in FIGS. 3 and 4, the turntable unit 1 includes a turntable 2, a movable hub 15, and a spring (biasing member) 21. The turntable 2 is formed in a substantially disc shape with resin or metal. On the upper surface side of the turntable 2, an annular recess 3 and a disk 23 provided on the outer peripheral edge of the recess 3 are placed. The mounting portion 6 and a support shaft 7 formed of a cylindrical protrusion centered on the axis II are integrally formed. The support shaft 7 is provided with a shaft hole 5 penetrating in the vertical direction. By press-fitting the spindle shaft 13 into the shaft hole 5, the turntable 2 can rotate integrally with the spindle shaft 13.

  Note that the shaft hole 5 is not formed as a through-hole and the Y1 side end is closed, or the upper end of the spindle shaft 13 is provided with a convex stopper at the Y1 side end. It is good also as a shape where the part 14 does not slip out above the support shaft 7. On the outer peripheral surface of the support shaft 7, a spiral groove portion 8 is formed coaxially with the axis II and in an arbitrary rotation direction. A locking groove 9 for installing the slit washer 22 is formed on the outer peripheral surface on the upper end side of the support shaft 7. For the purpose of preventing slipping of the rotating disk 23, an elastic member 4 such as a thin rubber formed in an annular shape is attached to the surface of the mounting portion 6.

  The movable hub 15 is formed in a substantially disk shape with resin or metal, and a hub hole 16 centering on the axis II is opened at the center. On the inner peripheral surface of the hub hole 16, a pair of engaging portions 20 that slide in a spiral groove portion 8 formed on the support shaft 7 are provided so as to project. The movable hub 15 moves in the vertical direction (Y1-Y2 direction) along the axis II while rotating in the A1-A2 direction centering on the axis II with respect to the support shaft 7 by the engagement. Be able to. The shape of the engaging portion 20 is not limited to a pair of protrusions, and may be a single protrusion, three or more protrusions, or a spiral shape that is screwed into the groove 8.

  On the outer peripheral portion of the movable hub 15, a guide portion 17 chamfered as a guide when the disc 23 is mounted, and an inner peripheral surface of the center hole 24 of the disc 23 formed continuously below the guide portion 17 are fitted. And a taper portion 19 is provided. The shape of the taper portion 19 is a taper shape that expands toward the bottom (Y2 direction). The inner diameter D1 shown in FIG. 2 is smaller than the diameter of the center hole 24, and the outer diameter D2 is the center hole 24. It is larger than the diameter. In addition, the shape of the taper part 19 and the guide part 17 is not limited to a taper surface (conical surface), A partial spherical surface may be sufficient.

As shown in FIG. 4, the spring 21 is disposed between the lower surface 18 of the movable hub 15 attached to the support shaft 7 and the inner bottom surface of the recess 3 of the turntable 2.
The spring 21 is a compression coil spring inserted through the outer periphery of the support shaft 7, and its inner diameter is set to be approximately the same as or slightly larger than the outer diameter of the support shaft 7, and is provided without rattling with respect to the support shaft 7. ing. And the movable hub 15 is always urged | biased upwards (Y1 direction) which is the direction away from the turntable 2. As shown in FIG.

  Note that the end portions of the spring 21 are not rubbed or caught with the lower surface 18 of the movable hub 15 or the inner bottom surface of the recess 3 of the turntable 2 as the movable hub 15 rotates. It is good also as a closed end by grinding. Thereby, the movable hub 15 can be rotated smoothly, and it can prevent that abnormal noises, such as a rubbing sound, generate | occur | produce. Further, as shown in FIGS. 4 and 5, lubricating sheets 300 and 301 are interposed between the spring 21 and the lower surface 18 of the movable hub 15 and between the spring 21 and the inner bottom surface of the recess 3 of the turntable 2, respectively. May be.

  The lubrication sheets 300 and 301 are formed by forming a thin resin sheet material having lubricity on the surface of a silicon base or the like in a ring shape, and the outer diameter of each of the lubrication sheets 300 and 301 is that of the spring 21 when contracted. The outer diameter is larger than the outer diameter and the inner diameter is slightly larger than the outer diameter of the support shaft 7 and is inserted through the support shaft 7. Therefore, when the movable hub 15 rotates, the upper and lower ends of the spring 21 are not directly rubbed or caught with the lower surface 18 of the movable hub 15 or the inner bottom surface of the recess 3 of the turntable 2. It can turn more smoothly.

  Further, the spring (biasing member) 21 may be formed of an elastic body such as a rubber ring having a high slidability instead of a metal coil spring, so that the movable hub 15 can be rotated smoothly. In addition, although it is preferable that both the lubricating sheets 300 and 301 are installed, only one of them may be installed.

  A slit washer 22 having an outer diameter larger than that of the hub hole 16 and having a thickness substantially equal to the groove width of the locking groove 9 is fitted into the locking groove 9 of the support shaft 7. The movable hub 15 biased by the spring 21 is prevented from coming out upward from the support shaft 7.

  Although not particularly illustrated, the disk device of the present embodiment emits laser light toward the disk 23 placed on the turntable 2 and receives return light reflected by the recording surface of the disk 23. Accordingly, an optical pickup for reading information recorded on the disk 23 and a pickup transfer mechanism for transferring the optical pickup in the radial direction of the disk 23 are provided.

Next, the operation of the disk device having the above configuration will be described.
1 to 4 show a state in which the disk 23 is not placed on the turntable unit 1. At this time, the movable hub 15 is positioned at the upper moving end in contact with the slit washer 22 by receiving a biasing force in the Y1 direction by the spring 21, and is in a state of waiting for the disk 23 to be mounted. In this state, the disk 23 is transported into the disk device by a disk transport mechanism (not shown), and the center hole 24 of the disk 23 faces the movable hub 15 above the movable hub 15.

  In the process in which the disk 23 transported by the disk transport mechanism approaches the turntable unit 1 relatively and is attached to the turntable unit 1, first, the center of the disk 23 coincides with the axis II. When mounted, the center hole 24 of the disk 23 abuts on the tapered portion 19 concentrically. That is, almost the entire circumference of the peripheral edge of the center hole 24 comes into contact with the circumferential surface of the tapered portion 19.

  Accordingly, it is not necessary to correct the displacement of the disk 23 by the taper portion 19, and the movable hub 15 that has received the urging force of the disk 23 toward the turntable 2 rotates in the Y2 direction while rotating along the axis II. Can descend. Therefore, even when the disk 23 is placed on the turntable 2, the concentric relationship between the center hole 24 and the movable hub 15 is maintained. Therefore, when the disk 23 rotates together with the spindle shaft 13 and the turntable 2 by the driving force of the motor 11 thereafter, no eccentricity occurs in the rotating disk 23.

  Next, when the disc 23 is mounted on the turntable unit 1 in a state where the center of the disc 23 does not coincide with the axis II, the center hole 24 abuts against the tapered portion 19 in an eccentric state. At this time, only a part of the peripheral edge portion of the center hole 24 abuts on the peripheral surface of the tapered portion 19.

  When the disk 23 approaches the turntable 2 in this state, the movable hub 15 receives an urging force in a direction inclined with respect to the axis II from the disk 23. However, in the present embodiment, since the engaging portion 20 provided on the movable hub 15 is slidably engaged with the spiral groove portion 8, the movable hub 15 does not tilt, but the axis II. It is possible to descend in the Y2 direction while rotating about.

  Therefore, when the disk 23 is placed on the turntable 2, the center of the disk 23 is guided by the tapered portion 19 so as to coincide with the axis II, and the positional deviation is reliably corrected, Thereafter, eccentricity of the rotating disk 23 can be prevented.

Next, a second embodiment shown in FIG. 7 will be described.
The second embodiment is a modification of the configuration of the turntable 2 and the spindle shaft 13 in the first embodiment. Since the configuration other than the turntable 2 and the spindle shaft 13 is the same as that of the first embodiment, the same reference numerals are given and detailed description thereof is omitted.

  In the second embodiment, the spiral groove 8 into which the engaging portion 20 of the movable hub 15 is slidably formed is formed directly on the outer peripheral surface of the spindle shaft 202, and on the lower end portion side of the spindle shaft 202. A shaft hole 201 provided in the turntable 200 is fitted and integrated.

  In this configuration, since the movable hub 15 is directly inserted into the spindle shaft 202 without using a turntable, the alignment accuracy between the center of the movable hub 15 and the center of the spindle shaft 202 is increased.

1 is a perspective view showing a disk device according to an embodiment of the present invention. The side view of the disc apparatus of FIG. FIG. 2 is an exploded perspective view of the disk device of FIG. 1. FIG. 2 is an exploded side sectional view of the disk device of FIG. 1. The sectional side view which shows the state in which the disc was mounted. The perspective view of a movable hub. The sectional side view which shows the disc apparatus which is the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Turntable unit 2 Turntable 5 Shaft hole 6 Mounting part 7 Supporting shaft 8 Groove part 11 Motor 13, 202 Spindle shaft 15 Movable hub 19 Taper part 20 Engagement part 21 Spring 23 Disk 24 Center hole 300, 301 Lubrication sheet

Claims (4)

In a disk device that includes a motor provided with a spindle shaft and a turntable that is fixed to the spindle shaft and rotates, and a disk is mounted on a mounting portion formed on the turntable and is driven to rotate.
The turntable is provided with a support shaft that is coaxial with the spindle shaft and has a spiral groove formed in the periphery thereof, and the support shaft has a tapered portion that slides in contact with the center hole of the disc and positions the disc. And a movable hub having an engaging portion that slides in the groove is supported so as to be vertically movable while rotating along the support shaft, and the movable hub is interposed between the turntable and the movable hub. A disk device comprising a biasing member that biases the hub upward.   The disk device according to claim 1, wherein the support shaft is formed integrally with the turntable.   2. The disk apparatus according to claim 1, wherein the support shaft is formed integrally with the spindle shaft. 4. A sliding member is interposed between at least one of the urging member and the turntable and between the urging member and the movable hub. The disk device described.

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