Disc reproducing apparatus with motor base bearing system

Details Disc reproducing apparatus with motor base bearing system Disc reproducing apparatus with motor base bearing system

1997-09-05

2001-11-27

Miller, Brian E. (Department: 2153)

Dynamic information storage or retrieval

Dynamic mechanism subsystem

Specific detail of storage medium support or motion production

Reexamination Certificate

active

06324152

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a disc reproducing apparatus for playing the optical disc such as CD (Compact Disc), CD-ROM, DVD (Digital Versatile Disc), DVD-ROM, and more particularly, to a skew adjusting system of the disc reproducing apparatus.
BACKGROUND OF THE INVENTION
In the disc drive for playing high-density optical discs such as CD players, DVD players, CD-ROM drives or DVD-ROM drives, it is necessary to adjust the direction of the optical axis of the optical pickup to intersect at the right angle the disc surface (skew adjustment) in the assembly process. As the skew adjustment, the following methods have been conventionally performed.
FIG. 23
shows the skew adjustment by adjusting the heights of three fulcrums among four fulcrums which are rotatably mounted on a chassis for supporting respective ends of two guide rods
102
,
102
for guiding the optical pickup
101
along a disc surface. The height of each fulcrum is adjusted by rotating the fulcrum itself so that a helical cam
103
defined on the fulcrum lifts up or down its associated end of the guide rod
102
.
FIG. 24
shows another conventional skew adjustment in which three portions of a motor base supporting a motor
104
are adjusted their heights by screws
105
.
The skew adjustment is comprised of a tangential skew adjustment and a radial skew adjustment. The tangential skew adjustment adjusts the optical axis of the optical pickup to intersect at the right angle the disc surface, seen from the direction of a trace of the beam spots of the optical pickup, i.e., a normal on the disc surface. The radial skew adjustment adjusts the optical axis of the optical pickup to intersect at the right angle the normal line, seen from the direction intersecting at the right angle the disc surface.
The conventional skew adjustments as shown in
FIGS. 21 and 22
have a following. For example, in the former one (FIG.
21
), i.e., the skew adjustment by adjusting the attitude of optical pickup, the adjustment at each end of guide rods badly influences with each other. That is, since it is impossible to independently perform the tangential skew adjustment and the radial skew adjustment, there is required a lot of times and labors for completing the skew adjustment. Because the tangential skew adjustment deteriorates the formerly completed result of the radial skew adjustment, and vice versa. The latter one (FIG.
22
), i.e., the skew adjustment by adjusting the attitude of motor also has a similar problem.
SUMMARY OF THE INVENTION
The present invention has been made for solving the problems in the conventional skew adjustments. It is, therefore, an object of the present invention to provide the disc reproducing apparatus which is able to independently carried out the tangential skew adjustment and the radial skew adjustment, thus able to perform them accurately and efficiently.
In order to achieve the above object, a disc reproducing apparatus according to one aspect of the present invention includes, a motor for driving the disc, a turntable coupled to a motor shaft of the motor, a motor base for mounting the motor, a chassis for supporting the motor, a motor base bearing system mounted on the chassis for bearing the pendulum swing of the motor base above the chassis around a first axis along a trace of a beam spot of an optical pickup to a disc placed on the turntable and the flapping of the motor base around a second axis on the motor base for intersecting at the right angle the beam spot trace in parallel with the disc surface, a device for holding the motor base on the motor base bearing system, a first adjusting member mounted on the chassis for adjusting the pendulum swing attitude of the motor base around the first axis and a second adjusting member mounted on the chassis for adjusting the flapping attitude of the motor base around the second axis.
In order to achieve the above object, a disc reproducing apparatus according to another aspect of the present invention includes, a turntable for rotatably supporting a disc, a turntable base for mounting the turntable, a chassis for supporting the turntable base, a turntable base bearing system mounted on the chassis for bearing the pendulum swing of the turntable base above the chassis around a first axis along a trace of a beam spot of an optical pickup to the disc placed on the turntable and the flapping of the turntable base around a second axis on the turntable base for intersecting at the right angle the beam spot trace in parallel with the disc surface, a device for holding the motor base on the motor base bearing system, a first adjusting member mounted on the chassis for adjusting the pendulum swing attitude of the motor base around the first axis and a second adjusting member mounted on the chassis for adjusting the flapping attitude of the motor base around the second axis.
According to disc reproducing apparatus of the first aspect of the present invention, it is able to perform the tangential skew adjustment without causing a normal line aberration by adjusting the pendulum swing attitude around the first axis of the motor base on the motor base bearing system. Further, it is able to perform the radial skew adjustment without causing the normal line aberration by adjusting the flapping attitude around the second axis of the motor base on the motor base bearing system. Accordingly, it is possible to independently perform the tangential skew adjustment and the radial skew adjustment, thus achieving accurate and efficient skew adjustment.
Here, it is desirable to define the second axis on the position extending through the center of the disc. The motor base bearing system can be constructed by the member having an epicycloid surface around the first axis.
Further, by supporting the motor base in the condition that it is pressed resiliently to the chassis, it is able to prevent the play of the motor base on a chassis.
According to disc reproducing apparatus of the second aspect of the present invention, it is also able to perform the tangential skew adjustment without causing a normal line aberration by adjusting the pendulum swing attitude around the first axis of the turntable base on the turntable base bearing system. Further, it is able to perform the radial skew adjustment without causing the normal line aberration by adjusting the flapping attitude around the second axis of the turntable base on the turntable base bearing system. Accordingly, it is possible to independently perform the tangential skew adjustment and the radial skew adjustment, thus achieving accurate and efficient skew adjustment.
Here, it is desirable to define the second axis on the position extending through the center of the disc. The turntable base bearing system can be constructed by the member having an epicycloid surface around the first axis.
Further, by supporting the turntable base in the condition that it is pressed resiliently to the chassis, it is able to prevent the play of the turntable base on a chassis. Additional objects and advantages of the present invention will be apparent to persons skilled in the art from a study of the following description and the accompanying drawings, which are hereby incorporated in and constitute a part of this specification.


REFERENCES:
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patent: 5267089 (1993-11-01), Yamamoto et al.
patent: 5768248 (1998-06-01), Lee
Patent Abstract of Japan vol. 008, No. 182 (M-319), Aug. 22, 1984 & JP 59 073621 A (Sanyo Denki KK; Others: 01), Apr. 25, 1984.
Patent Abstracts of Japan vol. 010, No. 351 (P-520), Nov. 27, 1986 & JP 61 150162 A (Ricoh Co Ltd), Jul. 8, 1986.
GB 2 085 635 A (Victor Company of Japan) Apr. 28, 1982.
Patent Abstracts of Japan vol. 010, No. 284 (P-501), Sep. 26, 1986 & JP 61 104335 A (Asahi Optical Co Ltd), May 22, 1986.
Patent Abstracts of Japan vol. 010, No. 225 (P-484), Aug. 6, 1986 & JP 61 061268 A (Mitsubishi Electric Corp), Mar. 29, 198

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