OPTICAL DISC APPARATUS AND LENS SHIFT CORRECTION METHOD
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United States of America Patent
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N/A
Issued Date -
Apr 23, 2009
app pub date -
Feb 28, 2008
filing date -
Oct 19, 2007
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
An optical disc apparatus, which executes tracking control for an objective lens by generating a push-pull signal, includes a determination unit which detects symmetry of the push-pull signal and determines whether balance of signal characteristics of the push-pull signal is good, a lens shift amount detection unit which detects, in a case where the determination unit determines that the balance of the signal characteristics of the push-pull signal is not good, a lens shift amount of the objective lens in such a manner as to improve the balance of the signal characteristics, a memory unit which stores the lens shift amount that is detected by the lens shift amount detection unit, and an addition unit which constantly applies the lens shift amount, which is stored in the memory unit, to a tracking actuator which shifts the objective lens.
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