FOCUS CONTROL METHOD AND OPTICAL DISC DRIVE
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United States of America Patent
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Issued Date -
Apr 3, 2008
app pub date -
Aug 10, 2007
filing date -
Sep 29, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
By a controller, land and groove areas of an optical disc are tracked, two focus error signals are detected in PID portions in the respective land and groove areas, a difference of focus offset is calculated on the basis of the detection, and the two focus error signals are corrected so as to set the difference to zero.
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