Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Ryoichi Ishikawa0
Date of Patent
August 21, 2007
0Patent Application Number
106073050
Date Filed
June 27, 2003
0Patent Primary Examiner
Patent abstract
In an optical disk apparatus, when a focus deviation occurs, amplitude driving of a pickup is performed for focus pull-in immediately without a waiting time. The amplitude driving is performed with a first amplitude a given number of times, and when detection of a focusing point fails, amplitude driving with a second amplitude larger than the first amplitude is performed.
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