Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
September 15, 2009
Patent Application Number
10580819
Date Filed
November 10, 2004
Patent Primary Examiner
Patent abstract
A method and apparatus for performing reproduction position servo-control without reducing the recording capacity of a holographic recording medium. Upon the reproduction of a holographic recording medium 18, part of a reproduction beam serving as a servo beam is projected onto a recording layer 18A of the holographic recording medium 18 from the side opposite to the side of the reproduction beam (a reference beam) along the same optical axis as that of the reproduction beam, and the diffraction beam thereof is detected by a photodetector 26C through a polarizing beam splitter 26B.
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