Clamping device of disc

Details Clamping device of disc Clamping device of disc

2000-09-28

2003-06-24

Nguyen, Hoa T. (Department: 2652)

Dynamic information storage or retrieval

Dynamic mechanism subsystem

Specific detail of storage medium support or motion production

Reexamination Certificate

active

06584064

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a clamping device of disc (optical recording medium) applied to a compact disc-read only memory (CD-ROM), a CD player, a digital versatile system (DVS), a digital versatile disc ROM (DVD ROM), a digital versatile disc (DVD) play and the like.
DESCRIPTION OF THE PRIOR ART
A clamping device of disc according to the prior art includes, as illustrated in
FIG. 1
, a spindle motor
10
mounted within a deck body (not shown), a turntable rotor
14
rotably disposed on the spindle motor
10
to be contacted to an inner non-recoding surface
12
a
formed underneath a disc
12
, a clamping york
16
centrally protruded at the turntable rotor
14
to be inserted into a setting hole
12
b
centrally formed at the disc
12
, a clamp
18
for pressing the inner non-recording surface
12
a
formed on the disc
12
liftably mounted underneath a deck cover (not shown) secured to an upper surface of the body, and a clamping magnet
20
centrally mounted at the clamping
18
for being coupled to the clamping york
16
by magnetic force when the clamp
18
is downwardly checked.
However, there is a problem in the clamping device of disc thus constructed according to the prior art in that only the inner non-recoding surface
12
a
of the disc
12
is pressed when the clamp
18
presses the disc
12
mounted on the turntable rotor
14
, such that the disc
12
cannot be evenly flattened when the disc
12
warped in the opposite (upward) direction of a disc pick-up is placed on the turntable rotor
14
for clamping via the clamp
18
, thereby generating a raising phenomenon where outer tracks of the disc
12
are gradually more raised upwards than inner tracks of the disc
12
, resulting in improper reproduction of data from the disc
12
due to uneven optical pattern when the rotating bottom recording surface
12
c
of the disc
12
is reproduced by a reproduction apparatus (not shown).
SUMMARY OF THE INVENTION
The present invention is disclosed to solve the afore-mentioned problems and it is an object of the present invention to provide a clamping device of disc adapted to flatten a defective disc warped in the opposite direction (upward direction) of disc pick-up for enabling an easy reproduction of data recorded in the disc.
In accordance with the object of the present is invention, there is provided a clamping device of disc, the clamping device of disc so constructed as to allow a disc placed on a tray to be arranged between a turntable rotor mounted at a deck body and a clamp mounted at a deck cover for clamping, wherein the clamp is integrally formed with a plurality of press protruders at an outer periphery and disc pressing surface at an inner periphery to simultaneously press an inner non-recording surface and an outer non-recording surface of the disc accommodated on the turntable rotor.


REFERENCES:
patent: 4387454 (1983-06-01), Yamamura et al.
patent: 4390979 (1983-06-01), Saito et al.
patent: 4786997 (1988-11-01), Funabashi et al.
patent: 5006945 (1991-04-01), Furusawa
patent: 5824388 (1998-10-01), Freund et al.
patent: 6108294 (2000-08-01), Iwanaga
patent: 6201782 (2001-03-01), Tanaka et al.
patent: 6275465 (2001-08-01), Shirashima et al.

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