Method for distinguishing unbalanced disc
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United States of America Patent
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Aug 2, 2011
Grant Date -
Apr 29, 2010
app pub date -
Sep 1, 2009
filing date -
Oct 24, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for distinguishing unbalanced disc in an optical disc reproducing/recording apparatus, comprising following steps: moving an optical pickup head to a first position of an optical disc; rotating the optical disc to a predetermined rotating speed; transferring a focus error signal produced by the optical pickup head to a focus control voltage signal; controlling the optical pickup head by the focus control voltage signal to maintain a focus light spot produced by the optical pickup head on the optical disc; and distinguishing if the optical disc is an unbalanced disc according to the focus control voltage signal.
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