OPTICAL PICKUP APPARATUS
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United States of America Patent
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N/A
Issued Date -
Apr 4, 2013
app pub date -
Oct 1, 2012
filing date -
Sep 29, 2011
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An optical pickup apparatus including a photodetector including first to fourth quadrant light-receiving portions, a first generating unit configured to generate a focus error signal based on respective signals from the first to fourth light-receiving portions, a second generating unit configured to generate a tracking error signal based on respective signals from the first to fourth light-receiving portions, first to fourth low-pass filters configured to allow respective signals to be input thereto from the first to fourth light-receiving portions, a third generating unit configured to generate a first correction signal for correcting the focus error signal by performing subtraction on an addition signal obtained by adding respective signals from the first and fourth low-pass filters, and an addition signal obtained by adding respective signals from the second and third low-pass filters, and a correction unit configured to correct the focus error signal based on the first correction signal.
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