JP2002269878A - Disk driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk driving device whose clamper aligning mechanism does not obstruct thinning of the device or does not generate nuisance abnormal sounds when the clamp is in operation. SOLUTION: A clamper aligning hub 10 with a tapered side 10a which can come into slidable contact with a clamper 5 and center the clamper 5 to an rotary shaft 1a, and a coil spring 9 which elastically supports the clamper aligning hub 10 making it freely ascendable and descendable in the axial direction of the rotary shaft 1a are equipped around the rotary shaft 1a of a driving motor 1. The clamper 5 is centered thrusting the clamper aligning hub 10 when the clamp of the disk D is in operation. Thus, the clamper 5 can be smoothly centered since the sliding resistance between the tapered side 10a and the clamper 5 becomes small even if the inclined angle of the tapered side 10a of the clampler aligning hub 10 is made gentle, then large projection of the clamper aligning hub 10 to the clamp 5 side or large projection of a part of the clamper 5 to the turntable 2 side is not required.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive for rotating a disk-shaped recording medium (hereinafter, simply referred to as a disk) such as an optical disk or a magneto-optical disk.
In particular, the present invention relates to a clamper centering mechanism for centering a clamper with respect to a motor rotation axis during a disk clamping operation.

[0002]

2. Description of the Related Art FIG. 4 is a sectional view for explaining a conventional disk drive. In FIG. 1, a drive motor 1 is fixed to a chassis (not shown).
A turntable 2 made of synthetic resin is fixed around the axis of the rotary shaft 1a by press-fitting or the like. Turntable 2
A metal disk centering hub 3 is mounted around the cylindrical portion 2a in a vertically movable manner. The disk centering hub 3 is elastically mounted on the turntable 2 via a coil spring 4. Supported. The disc centering hub 3 is formed with a tapered surface 3a. The tapered surface 3a functions as a guide surface that slides on the edge of the center hole D1 of the disk D. The rotatable clamper 5 disposed above the turntable 2 is supported by a clamper supporting means (not shown) so as to be able to approach and separate from the turntable 2. The clamper 5 is provided with a central guide portion 6 and a pressing table portion 7. The lower end of the central guide portion 6 is slightly protruded from the lower surface of the pressing table portion 7 (disc pressing surface) toward the turntable 2. is there. The center guide portion 6 is provided with an engagement hole 6b having a tapered surface 6a on the lower opening side, and the upper end of the rotating shaft 1a can be inserted into the engagement hole 6b while being guided by the tapered surface 6a. I have. The pressing table unit 7 is integrated with the central guide unit 6 and can press the disk D.

[0003] In the disk drive device constructed as described above, first, the disk D transported by the transport mechanism (not shown) is positioned between the turntable 2 and the clamper 5, and is inserted into the center hole D 1 of the disk D. By inserting the disk alignment hub 3, the disk D is held by the disk alignment hub 3 as shown in FIG. Next, the clamper 5 is lowered to approach the turntable 2. At this time, first, the taper surface 6a of the center guide portion 6 abuts on the upper edge of the rotary shaft 1a, and the clamper 5 moves the rotary shaft 1a into the engagement hole 6b along the tapered surface 6a.
Are inserted, and in this process, the centering of the clamper 5 with respect to the rotating shaft 1a is performed. Also, the rotating shaft 1a
Is inserted into the engagement hole 6b, the clamper 5
Press table 7 comes into contact with the upper surface of the disk D, and the disk D is pushed downward together with the disk alignment hub 3. At this time, the disc centering hub 3 descends while compressing the coil spring 4, and its tapered surface 3a
Centering the disk D with respect to the rotating shaft 1a by the guide function of (1). When the pressing table 7 of the clamper 5 presses the disk D onto the turntable 2, the disk D is clamped between the clamper 5 and the turntable 2.

After the disk D is clamped in this way, when the drive motor 1 drives the turntable 2 via the rotary shaft 1a, the centered clamper 5 and the disk D are integrated with the turntable 2 without eccentricity. To rotate. Then, information can be read or written on the rotating disk D by an optical pickup device (not shown) or the like.

[0005]

In the above-mentioned conventional example,
In order to center the clamper 5 with respect to the rotation shaft 1a, a central guide portion 6 having a tapered surface 6a is protruded toward the turntable 2 by a predetermined amount. This is the tapered surface 6
a to reduce the sliding resistance between the rotating shaft 1a and the
If the center guide portion 6 has a small amount of protrusion and the inclination angle of the tapered surface 6a is gentle, the sliding resistance increases, so that the rotating shaft 1a is caught on the tapered surface 6a, and the clamping is performed. Operation may be hindered. However, if the configuration in which the central guide portion 6 is protruded by a predetermined amount toward the turntable 2 as described above is employed, the overall thickness dimension of the clamper 5 increases.
This has been an obstacle in promoting the thinning of the device. In order to suppress the thickness of the clamper 5, a configuration in which the upper end portion of the rotating shaft 1a or its vicinity protrudes toward the clamper 5 can be considered, but this also hinders the thinning of the device. Further, in such a conventional example, the centering portion 6 is forcibly moved toward the center of the rotating shaft 1a for centering by inserting the rotating shaft 1a into the engaging hole 6b along the tapered surface 6a. The rotation axis 1a
There is also a problem that an unpleasant noise is likely to be generated when the upper end is disengaged from the tapered surface 6a and is inserted into the engagement hole 6b.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances of the prior art, and an object thereof is to provide a clamper alignment mechanism which does not hinder the thinning of the apparatus, and which causes unpleasant noise during the clamping operation. An object of the present invention is to provide a disk drive device that does not cause such a problem.

[0007]

According to the present invention, there is provided a clamper centering hub elastically supported so as to be able to move up and down along the axial direction of a rotary shaft of a drive motor, and to provide a clamper during clamping operation. When the hub for aligning the clamper is pushed in, the hub for aligning the clamper is elastically lowered while centering the clamper using the tapered surface as a guide surface. As a result, even if the inclination angle of the tapered surface of the clamper centering hub is made gentle, the sliding resistance generated between the tapered surface and the clamper is reduced, and the clamper can be smoothly centered. There is no need to protrude the centering hub largely toward the clamp or to protrude a part of the clamper largely toward the turntable.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a disk drive according to the present invention,
A drive motor having a rotating shaft protruding therefrom, a turntable integrated and rotated around the axis of the rotating shaft, and a clamper for pressing a disk-shaped recording medium onto the turntable; In a disk drive device that rotates the recording medium in a clamped state sandwiched between the clamper and the recording medium by the drive motor, the disk drive device has a tapered surface around the rotation shaft that can slidably contact the clamper. A clamper centering hub for centering with respect to the rotating shaft; and an elastic supporting member elastically supporting the clamper centering hub and capable of moving up and down along the axial direction of the rotating shaft. In some cases, the clamper is centered while pushing the clamper centering hub.

In the disk drive device constructed as described above, when the clamper comes into contact with and pushes in the clamper aligning hub during the clamping operation, the clamper aligning hub is elastically lowered along the axial direction of the rotating shaft. Therefore, a large sliding resistance does not occur between the clamper and the hub for centering the clamper. Therefore, the hub for centering the clamper can smoothly center the clamper even if the inclination angle of the tapered surface is gentle. As a result, there is no need to protrude the clamper centering hub largely to the clamper side, or to protrude a part of the clamper largely to the turntable side, so that the apparatus can be made thinner. Moreover, the clamper is centered while elastically pushing the hub for aligning the clamper,
No harsh collision noise is generated when the centering is completed.

In the above configuration, if the clamper centering hub can be moved up and down by using the outer peripheral surface of the rotating shaft as a sliding surface, the clamper centering hub can be moved up and down smoothly along the axis of the rotating shaft. This is preferable because the rotation center of the hub for aligning the clamper can be easily aligned with the axis of the rotation shaft.

In the above structure, it is preferable that the clamper centering hub is disposed in a space inside the disk centering hub for centering the disk. In this case, the space for incorporating the clamper centering hub is provided. Can be secured without difficulty, and the assemblability can be improved.

[0012]

Embodiments will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of the disk drive device according to the first embodiment at the start of the clamping operation, FIG. 2 is a cutaway perspective view of the disk drive device shown in FIG. 1 at the completion of the clamping operation, and FIG. FIG. 9 is a cross-sectional view of the disk drive device at the start of the clamping operation, and portions corresponding to FIG. 4 used for describing the conventional example are denoted by the same reference numerals.

In the first embodiment shown in FIGS. 1 and 2, a drive motor 1 is fixed to a chassis (not shown), and a turntable 2 made of synthetic resin is provided around the rotation shaft 1a of the drive motor 1. Is press-fitted and fixed. Around the cylindrical portion 2a of the turntable 2, a metal disk centering hub 3 elastically supported by a coil spring 4 is mounted so as to be movable up and down. The tapered surface 3a of the disk centering hub 3 functions as a guide surface that slides on the edge of the center hole D1 of the disk D, and the retaining ring 8 prevents the disk centering hub 3 from falling off. A metal clamper centering hub 10 elastically supported by a coil spring 9 is incorporated in a space inside the disk centering hub 3, and the clamper centering hub 10 is an outer peripheral surface of the rotating shaft 1 a. Can be moved up and down as a sliding surface. The hub 10 for aligning the clamper is a tapered surface 1 having a gentle inclination that functions as a guide surface for the clamper 5.
0a, and a retaining ring 11 locked to the upper part of the rotating shaft 1a prevents the hub 10 for aligning the clamper from falling off.

A rotatable clamper 5 is disposed above the turntable 2, and the clamper 5 is supported by clamper support means (not shown) so as to be able to approach and separate from the turntable 2. The clamper 5 has a central guide portion 6 having an engagement hole 6b, and a pressing table portion 7 integrated with the central guide portion 6 and capable of pressing the disk D.
However, the lower end of the central guide portion 6 is located substantially in the same plane as the lower surface (disc pressing surface) of the pressing table portion 7. That is, since the center guide portion 6 does not protrude toward the turntable 2 as in the above-described conventional example, the thickness of the clamper 5 is reduced accordingly.

In the disk drive configured as described above, first, the disk D transported by the transport mechanism (not shown) is positioned between the turntable 2 and the clamper 5, and is inserted into the center hole D1 of the disk D. By inserting the hub 3 for disk alignment, the disk D is held by the hub 3 for disk alignment. Next, clamper 5
Is lowered to approach the turntable 2, the lower end of the center guide portion 6 of the clamper 5 first comes into contact with the tapered surface 10 a of the hub 10 for aligning the clamper, and the tapered surface 10 a
While sliding along a, the clamper centering hub 10 is pushed downward against the elastic force of the coil spring 9. At this time, since there is no large sliding resistance between the center guide portion 6 of the clamper 5 and the tapered surface 10a of the hub 10 for centering the clamper, even if the inclination angle of the tapered surface 10a is gentle, the clamper 5 is not moved. Are smoothly centered, and the center of rotation of the clamper 5 is set in a state of being coincident with the axis of the rotating shaft 1a. If the central guide portion 6 receives an excessive reaction force from the clamper centering hub 10 during the centering operation of the clamper 5, the leaf spring (not shown) incorporated in the clamper 5 bends and the central guide portion 6 is bent. 6 retreats.

Further, as the central guide portion 6 slides along the tapered surface 10a, the rotary shaft 1a is inserted into the engagement hole 6b, and the pressing table portion 7
The disc D is pushed downward together with the disc centering hub 3 by contacting the upper surface of the disc D. Therefore, the disk centering hub 3 descends while compressing the coil spring 4, and the disk D is centered by the guide function of the tapered surface 3a. The pressing table 7 of the clamper 5
When the disc D is pressed onto the turntable 2, the disc D is in a clamped state sandwiched between the clamper 5 and the turntable 2, as shown in FIG.

After the disk D is thus clamped, when the drive motor 1 drives the turntable 2 via the rotary shaft 1a, the centered clamper 5 and the disk D are integrated with the turntable 2 without eccentricity. To rotate. Then, information can be read or written on the rotating disk D by an optical pickup device (not shown) or the like.

As described above, in this embodiment, the rotating shaft 1a
For centering the clamper supported up and down along the axis
The taper surface 10a guides and centers the clamper 5 during the clamping operation, so that no large sliding resistance is generated between the clamper 5 and the taper surface 10a, and therefore, the inclination angle of the taper surface 10a is moderate. However, the clamper 5 can be smoothly centered. As a result, it is not necessary to protrude the clamper centering hub 10 largely to the clamper 5 side or to protrude the center guide portion 6 of the clamper 5 largely to the turntable 2 side, thereby promoting the thinning of the disk drive device. can do. In addition, since the clamper 5 is centered while elastically pushing the hub 10 for aligning the clamper, there is no fear of generating an unpleasant collision sound when the centering of the clamper 5 is completed.

Also, as in the present embodiment, if the clamper centering hub 10 is configured to move up and down with the outer peripheral surface of the rotary shaft 1a as a sliding surface, the clamper centering hub 10 is moved to the rotary shaft 1a. Can be smoothly moved up and down along the axial direction of the shaft, and the center of rotation of the hub 10 for aligning the clamper can be easily made to coincide with the axis of the rotating shaft 1a, so that the clamper 5 can be centered with high precision. Further, since the clamper centering hub 10 is arranged in the space inside the disk centering hub 3, a space for incorporating the clamper centering hub 10 can be secured without difficulty, and the assembling property is improved.

The second embodiment shown in FIG. 3 is different from the first embodiment in the shape of the clamper centering hub 10 and the shape of the central guide portion 6 of the clamper 5. Basically the same. That is, in the second embodiment, a mortar-shaped engaging hole 10b is provided at the top of the hub 10 for centering the clamper, and the wall surface of the engaging hole 10b is formed with a tapered surface 10a for guiding the central guide portion 6 of the clamper 5. A downwardly projecting hemispherical projection 6c is provided on the central guide portion 6, and the lower end of the hemispherical projection 6c is
Are located in substantially the same plane as the lower surface (disc pressing surface) of the disk.

In the disk drive configured as described above, when the disk D is clamped, the clamper 5
The semi-spherical projection 6c abuts on the tapered surface 10a of the hub 10 for centering the clamper and slides.
When the hemispherical projection 6c is completely pushed into the engagement hole 10b,
Centering of the clamper 5 is completed.

[0022]

The present invention is embodied in the form described above, and has the following effects.

A clamper aligning hub elastically supported so as to be able to move up and down along the axis of the rotation shaft of the drive motor is provided. When the clamper pushes the clamper aligning hub during a clamping operation, the clamper aligning hub is turned on. Is configured to center the clamper with its tapered surface as a guide surface while elastically descending, so that even if the inclination angle of the tapered surface of the hub for clamper centering is moderated, the gap between the tapered surface and the clamper is reduced. The resulting sliding resistance is reduced and the clamper can be smoothly centered. Therefore, it is not necessary to protrude the clamper centering hub largely to the clamp side or to protrude a part of the clamper largely to the turntable side, so that the device can be made thinner. In addition, since the clamper is centered while elastically pushing the hub for centering the clamper, an unpleasant collision sound is not generated when the centering is completed.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a disk drive device according to a first embodiment of the present invention when a clamping operation is started.

FIG. 2 is a cutaway perspective view of the disk drive device shown in FIG. 1 when a clamping operation is completed.

FIG. 3 is a cross-sectional view of a disk drive according to a second embodiment of the present invention at the start of a clamping operation.

FIG. 4 is a sectional view of a disk drive device showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drive motor 1a Rotating shaft 2 Turntable 3 Disc centering hub 4, 9 Coil spring (elastic support member) 5 Clamp 6 Central guide part 6b Engagement hole 6c Hemispheric projection 7 Press table part 8, 11 Retaining ring 10 Hub for centering clamper 10a Tapered surface D disk

Claims (3)

[Claims] 1. A drive motor having a rotating shaft protruding therefrom, a turntable integrated around the rotating shaft and driven to rotate, and a clamper for pressing a disk-shaped recording medium onto the turntable. A disk drive device configured to rotate the recording medium in a clamped state sandwiched between the turntable and the clamper by the drive motor, the tape drive having a tapered surface around the rotation shaft that can slide on the clamper. A clamper centering hub for centering the clamper with respect to the rotation shaft; and an elastic support member elastically supporting the clamper centering hub and capable of moving up and down along the axial direction of the rotation shaft. The clamper is configured to be centered while pushing in the clamper centering hub when the recording medium is clamped. Disk drive unit. 2. The disk drive according to claim 1, wherein the clamper centering hub is vertically movable with an outer peripheral surface of the rotating shaft as a sliding surface. 3. A disk alignment hub according to claim 1, wherein a disk centering hub inserted into a center hole of said recording medium and centering said recording medium is provided around said rotary shaft so as to be movable up and down. A disk drive device, wherein the clamper centering hub is arranged inside a core hub.