Optical drive device and amplification rate determining method
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United States of America Patent
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May 29, 2012
Grant Date -
Feb 25, 2010
app pub date -
Aug 24, 2009
filing date -
Aug 25, 2008
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Abstract
An optical drive device generates a first push-pull signal and a first sum signal based on a light receiving amount in two light receiving areas of which each width in a signal light tangent direction is smaller than a diameter of a spot of signal light, generates a first normalized push-pull signal by normalizing the first push-pull signal by using the first sum signal, and generates a tracking error signal based on the first normalized push-pull signal.
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