Dynamic information storage or retrieval – With particular cabinet structure
Reexamination Certificate
1998-05-19
2002-09-24
Letscher, George J. (Department: 2652)
Dynamic information storage or retrieval
With particular cabinet structure
Reexamination Certificate
active
06456580
ABSTRACT:
FIELD OF INVENTION
The present invention relates to the dynamic absorber for disc player such as CD disc player or DVD player.
BACKGROUND OF INVENTION
It is well known that a key to achieve a much higher operation speed of a disc player is to limit the vibration generated from the rotation source within the disc player during high speed operation. Typically, there are four categories as stated below with respect to the vibration absorber system of conventional disc player.
As shown in one conventional approach of
FIG. 1
, a damper (K,C) is provided between the traverse module
11
and tray motion control module
13
to absorb the vibration generated thereof due to the external force F. The damper in the system functions to lower the vibration of the traverse module
11
and then stabilizes the disc read operation. However, since the resonance frequency of the design is much higher than the disc operating frequency, this design induces a much higher vibration on the casing of the disc player. In succession, the vibration of the casing of the disc player induces resonance on the computer casing which houses the disc player. As a result, during high speed operation, the computer casing give rise to a substantial noise according to this approach.
As shown in another conventional approach of
FIG. 2
, an isolator (K, C) is provided between the traverse module
21
and the tray motion control module
23
to perform the isolation function. The approach successfully reduces the vibration of the disc player casing. However, since the resonance frequency of this design is much lower than the disc operating frequency, this design could not transmit the vibration of the transverse module
21
outwardly and experiences a higher vibration of the traverse module
21
. As a result, the disc read operation is not stable in some occasions and the disc speed must be lowered to achieve a stable read operation. It is known in the arts, the isolator differs from the damper in regard to the values of K and C. K is spring constant of the component and C is damping ratio of the component. The isolator has a smaller K value which keeps the vibration within the system generating the vibration. The damper has a bigger K value which lowers the vibration while the vibration is propagated outwardly from the system generating the vibration.
As shown in another conventional approach of
FIG. 3
which adopting the concept of the dynamic absorber, the traverse module
31
is connected to the tray motion control module
33
by a damper (K
1
, C
1
), and the tray motion control module
33
is further connected to the disc player's casing
35
by an isolator (K
2
, C
2
). In other words, the tray motion control module
33
, other than its conventional functions, also functions as a dynamic absorber which absorbs most of the vibration energy of the traverse module
31
. The inward or outward movement of the tray (not shown) poses a clearance requirement on the corresponding contact parts of the tray motion control module
33
. Therefore, a patting phenomenon is inadvertently created as a result of the tray motion control module
33
acting as the dynamic absorber.
As shown in another conventional approach of
FIG. 4
, a damper (K
1
, C
1
), a dynamic absorber
43
and an isolator (K
2
, C
2
) are provided between the traverse module
41
and the tray motion control module
45
to function as the vibration absorber. In this design, the dynamic absorber
43
experiences a substantial vibration while the traverse module
41
and the tray motion control module
45
achieves a much lower vibration. It is important to note that the dynamic absorber
43
is disposed between the traverse module
41
and the tray motion control module
45
. Therefore, as the disc player is disposed vertically during operation, the dynamic absorber
43
will be in contact with the tray motion control module
45
due to gravity effect. And due to the vibration of the dynamic absorber
43
is substantial, knocking or patting between the dynamic absorber
43
and the tray motion control module
45
will also be substantial. As the result, during high speed operation, not only the noise thereof is annoying to the user, but the resonance of the computer system's housing is undesiredly created. On the other hand, the damper (K
1
, C
1
) as well as the isolator (K
2
, C
2
) are made of the deformable rubber material upon which the assembly dimension accuracy is difficult to impose. An, in this design, dimension tolerances of the damper, isolator, the dynamic absorber and the assembly relationship inherently exist between the traverse module
41
and the tray motion control module
45
. In overall, the effective vibration absorbing capability of this design heavily depends on the control of the dimension tolerances mentioned above.
Due to the drawbacks recited above with respect to the conventional approaches, the present invention intends to provide a simple and effective way to lower the vibration associating with high speed operation of the disc player without the drawbacks mentioned above.
SUMMARY OF INVENTION
A disc player is provided to include a tray motion control module, a traverse module and a dynamic absorber. The tray motion control module supports the tray and, responsive to the instruction, performs in-out operation of the tray. The traverse module, via an isolator, connects to the tray motion control module. The dynamic absorber, via a damper, connects to the traverse module for absorbing the vibration caused by the rotational source on the traverse module. The damper with high damping value transmits most vibration energy from traverse module to dynamic absorber to lower the traverse's vibration. The isolator keeps the vibration within the traverse module.
REFERENCES:
patent: 4703470 (1987-10-01), Castagna et al.
patent: 5357500 (1994-10-01), Yanagisawa
patent: 5610892 (1997-03-01), Choi
patent: 2-260191 (1990-10-01), None
patent: 2144191 (1990-12-01), None
patent: 3-69336 (1991-07-01), None
patent: 1002168 (1998-01-01), None
ASUSTek Computer Inc.
Letscher George J.
Rabin & Berdo P.C.
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