Dynamic information storage or retrieval – Dynamic mechanism subsystem – Having power driven transducer assembly
Reexamination Certificate
1996-07-26
2002-05-07
Korzuch, William (Department: 2652)
Dynamic information storage or retrieval
Dynamic mechanism subsystem
Having power driven transducer assembly
C369S249100
Reexamination Certificate
active
06385160
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a pickup in an optical disk player and, more particularly, to a pickup adjusting apparatus which enables fine adjustments to the tilt of a pickup so that the pickup can be maintained horizontal with respect to a disk.
In an optical disk player such as a CDP (compact disk player), an LDP (laser disk player) or a DVDP (digital video disk player), a pickup should be maintained horizontal with respect to a disk so that a laser beam emitted from the pickup is vertically incident on the disk.
FIG. 1
illustrates the pickup portion of a typical disk player. As shown in the drawing, a turntable
1
for receiving a disk (not shown) and a pair of guide shafts
2
for supporting a pickup
3
are installed on a deck
4
. To one side of the pickup
3
, a tooth gear portion (not shown) for engaging with a screw shaft
5
is formed. The screw shaft
5
is driven by a driving motor
6
.
In the disk player having the above structure, when the driving motor
6
rotates the screw shaft
5
, the rotation of the screw shaft
5
slides the pickup
3
along the guide shafts
2
. Accordingly, as the pickup
3
moves in a radial direction of the disk, information recorded on the disk is read by the pickup
3
.
When reading information from the disk, the laser beam emitted from the pickup
3
should be perpendicularly incident on a desired position on the disk. However, pickup errors, due to a focusing error or an inclination error of the pickup
3
, sometimes occur. The focusing error occurs when the laser beam does not appropriately converge on the disk according to the distance between the disk and the pickup
3
. The inclination error occurs when the pickup
3
is inclined in a radial direction or a tangential direction with respect to the disk. Such errors can be compensated for by the focusing and tracking servo mechanism of the pickup
3
, but only to a limited degree since the guide shafts
2
, which support the pickup
3
, are fixedly mounted to the deck
4
by fixing portions
7
during the assembling process. Thus, complete compensation for the errors may not be possible. Further, in the case where accuracy is low during assembly and there is a large tolerance, correction for the above-mentioned errors becomes impossible.
SUMMARY OF THE INVENTION
To solve the above problems, it is an object of the present invention to provide a pickup adjusting apparatus in an optical disk player which enables fine adjustment to the tilt of a pickup to thereby correct inclination errors in a radial direction of a disk.
Accordingly, to achieve the above object, there is provided a pickup tilt adjustment apparatus in a disk player which includes a deck and a pickup. The pickup adjusting apparatus includes at least one pair of guide shafts installed on the deck and for supporting and guiding the pickup. Each of the guide shafts has a hole at least one end thereof, an adjusting means inserted into each hole and threadedly engaged with the deck, and a spring installed between each of the guide shafts and the deck and for providing a resistive force against a rotation of the adjusting means and biasing the guide shafts away from the deck, thereby to maintain an appropriate distance between the deck and each of the guide shafts.
REFERENCES:
patent: 4947481 (1990-08-01), Ikedo et al.
patent: 5036507 (1991-07-01), Yamashita
patent: 5124974 (1992-06-01), Kato et al.
patent: 5375115 (1994-12-01), Shimegi et al.
patent: 5488526 (1996-01-01), Sakashita et al.
patent: 5621713 (1997-04-01), Sato et al.
patent: 63-313370 (1988-12-01), None
patent: 1-282739 (1989-11-01), None
Korzuch William
Samsung Electronics Co,. Ltd.
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