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US 7,352,666 B2Granted
Focus-balance calibration method
AssigneeTian Holdings, LLC
InventorGriffen Chen
Life of this patent
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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.
Claims18
A method for calibrating the focus balance of a blank optical disc storing therein inherent information, comprising steps of:
- sequentially emitting a plurality of incident optical signals to and then receiving reflected optical signals from said blank optical disc so as to read said inherent information of said blank optical disc on different focusing conditions;
- generating a plurality of calibration-reference signals in response to said reflected optical signals, wherein different intensities of said calibration-reference signals correspond to different clarity degrees of said read inherent information;
- and
- determining an optimal condition according to said focusing conditions and said calibration-reference signals.
1 more element
Dependencies are inferred from the claim text.