Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Mechanism control by the control signal
Reexamination Certificate
2007-03-23
2010-12-28
Huber, Paul (Department: 2627)
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Mechanism control by the control signal
C369S053230, C369S053280
Reexamination Certificate
active
07859964
ABSTRACT:
The present invention relates to a method and an apparatus of adjusting a focusing servo in an optical disc device. According to an embodiment of the present invention, a focusing servo is coarsely adjusted using a tracking error signal for a blank disc, data is recorded in a predetermined area of the disc, and then the focusing servo is finely adjusted using the characteristics of a reproduced signal for the recorded data. In this case, the focusing servo is adjusted to adjust a focusing position of an objective lens, and the predetermined area is a region provided on the disc to detect optimum recording power. The characteristics of the reproduced signal include magnitude and/or jitter value of the reproduced RF signal. Therefore, the present invention can optimally adjust a focusing servo even for a blank disc, and can improve data recording quality.
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Birch & Stewart Kolasch & Birch, LLP
Huber Paul
LG Electronics Inc.
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