Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Minoru Yonezawa0
Hideaki Ohsawa0
Date of Patent
November 7, 2006
Patent Application Number
10898568
Date Filed
July 26, 2004
Patent Primary Examiner
Patent abstract
An optical disk apparatus has a first optical system having an objective lens with a first NA, a second optical system having an objective lens with a second NA lower than the first NA, an addition mechanism for adding focus error signals detected by the first and second optical systems, and an alignment mechanism for aligning the objective lens in accordance with the addition result of the addition mechanism.
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