Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
August 24, 2010
Patent Application Number
11874547
Date Filed
October 18, 2007
Patent Primary Examiner
Patent abstract
A phase plate and an optical head device are provided, which are capable of suppressing changes of the amount of light incident on a light-receiving unit even if the phase difference caused by transmission through a protective layer of an optical recording medium differs depending on the type of optical recording medium.
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