Dynamic information storage or retrieval – With particular cabinet structure – With mechanism to place disc on a turntable
Patent
1995-04-21
1998-12-01
Levy, Stuart S.
Dynamic information storage or retrieval
With particular cabinet structure
With mechanism to place disc on a turntable
G11B 3304
Patent
active
058448730
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a disc reproducing apparatus such as a CD player, a CD-ROM drive, an optical magnetic disc drive, or the like.
RELATED ART
In recent years, the size and weight of disc reproducing apparatuses such as CD players and CD-ROM drives that use optical discs as recording mediums have been reduced. In addition, disc reproducing apparatuses that are mounted on computers have been developed. In conventional disc reproducing apparatuses, a tray that holds a disc is unloaded and loaded from and into a cabinet.
FIGS. 17, 18A, and 18B are schematic diagrams showing a conventional disc reproducing apparatus.
In these drawings, reference numeral 1 is a cabinet. In the cabinet 1, a chassis 2 is disposed. The chassis 2 comprises an optical pickup 3, a tray 4, a turn table 12, and a clamper 5. The pickup 3 reads record information from a disc 10. The pickup 3 is supported by a guide shaft 13 secured to a base 6 and movable along the guide shaft 13 in arrow directions A-B. The tray 4 is supported by guide grooves 2a, 2a formed on both sides of the chassis 2. The tray 4 is movable along the guide grooves 2a and 2a in the arrow directions A-B. The tray 4 can be pulled out of the cabinet 1 in the arrow direction A for a predetermined amount. The clamper 5 is held by a plate 7 in such a manner that the clamper 5 is vertically movable. A motor 11 that drives the turn table 12 is secured to the base 6 of the pickup 3. The turn table 12 is secured to the rotating shaft of the motor 11. A disc chuck 12a is formed on the upper surface of the turn table 12. The disc chuck 12a fits into a center hole 10a of the disc 10. One edge portion is rotatably supported by the main body of the chassis 2 through a shaft 14. The other edge portion of the base 6 is connected to a rotating cam 16 through a pin 15. The rotating cam 16 has a spiral groove on the peripheral portion. The pin 15 is inserted into the spiral groove. When the rotating cam 16 is rotated, the position of the pin 15 varies in upper and lower directions. When the pin 15 moves in the upper and lower directions, the base 6 rotates in arrow directions C-D about the rotating shaft 14. Thus, the position of the turn table 12 is switched between a first position and a second position. At the first position, the disc 10 is nipped by the clamper 5 and the turn table 12. At the second position, a disc loading opening is formed by the clamper 5 and the turn table 12.
As shown in FIG. 18A, when the tray 4 is unloaded from the cabinet 1, the base 6 is inclined and the turn table 12 is placed at the second position, where the disc loading opening is open. After the tray 4 is loaded into the cabinet 1, the rotating cam 16 rotates in a predetermined direction. As shown in FIG. 18B, when the rotating cam 16 rotates, the base 6 rotates in the arrow direction C about the rotating shaft 14 for a predetermined angle. Thus, the turn table 16 rises and the disc 10 held on the tray 4 is nipped between the turn table 12 and the damper 5.
As described above, the disc reproducing apparatus has a mechanism that moves the turn table 12 in the upper and lower directions. However, since this mechanism occupies a large space in the cabinet 1, it is improper for accomplishing a compact disc reproducing apparatus.
To solve such a problem, a disc reproducing apparatus in which a tray that holds a disc drive mechanism including for example a turn table and a disc motor along with a disc can be unloaded and loaded from and into a cabinet has been developed. In this disc reproducing apparatus, since a means for holding a disc on a turn table while securing the disc is provided, a disc clamping mechanism or the like can be omitted from the cabinet and thereby the thickness of the apparatus can be reduced.
It is important to properly maintain the disc reproducing operation against an external shock. In particular, a disc reproducing apparatus mounted on a car should withstand strong shock as its essential requirement. In the disc reproducing apparatus shown in FIG.
REFERENCES:
patent: 4536865 (1985-08-01), Kenmostu et al.
patent: 5012462 (1991-04-01), Tsujita
patent: 5187701 (1993-02-01), Verheyen
Aoyama Noboru
Nakane Hiroshi
Ono Takuro
Davis David D.
Kabushiki Kaisha Toshiba
Levy Stuart S.
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