Focus-balance calibration method
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United States of America Patent
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Apr 1, 2008
Grant Date -
Jan 27, 2005
app pub date -
Jul 20, 2004
filing date -
Jul 21, 2003
priority date (Note) -
Expired
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Abstract
Absolute time in pre-groove (ATIP) signals or gain amplification signals corresponding to the ATIP signals for auto gain control (AGC) are used for focus-balance calibration of a blank optical disc. The ATIP signals are obtained in response to the movement of an optical pickup head to different positions. The ATIP signals or gain amplification signals are referred to locate an optimal position of the optical pickup head relative to the blank optical disc, therby accomplishing the focus-balance calibration.
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