OPTICAL DISC DEVICE
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United States of America Patent
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N/A
Issued Date -
Feb 6, 2014
app pub date -
Aug 2, 2013
filing date -
Aug 2, 2012
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Disclosed is an optical disc device that provides a stable servo signal with a simple configuration during the use of an objective lens showing significant color aberration. At time T0, which is before the start of a write operation (time T2), a defocus application circuit 111 generates a defocus signal DF1 to be added to a focusing error signal FES. A tracking signal gain control circuit 113 changes a tracking signal gain correction amount to be given to a tracking error signal TES to TG1. The defocus signal generated from the defocus application circuit terminates at substantially the same time the write operation starts (time T2). After the focusing error signal FES is no longer offset (at time T3), the tracking signal gain correction amount generated from the tracking signal gain control circuit 113 is restored to a reference value.
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