Title: Hologram recording and reproducing apparatus
Application Number: 200610058344 Application Date: 2006.03.03
Publication Number: 1838267 Publication Date: 2006.09.27
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: G11B7/0065,G11B7/09,G11B7/007,G11B7/13,G03H1/22
Applicant(s) Name: Fujitsu Ltd. Address:
Inventor(s) Name: Uno Kazushi, Tezuka Kouichi
Attorney & Agent: zhao shuping
Abstract:
     A hologram recording and reproducing apparatus minimizes reproduction errors by servo control on the tilting of a reference beam relative to a hologram recording medium. The apparatus includes an optical detector for servo control and an optical sensor for reproduction signal conversion. A pixel pattern generator generates, on a wave surface of the recording beam, a discretely distributed recording pixel pattern corresponding to the information to be recorded, and a specifically shaped and localized servo pixel pattern for the servo control. A beam splitter splits the reflected beam from the hologram recording medium into a reproduction beam directed to the optical detector for reproduction signal conversion and a servo beam directed to the optical detector for servo control. A servo controller controls the tilting of the reference beam relative to the hologram recording medium, based on an output signal from the servo control optical detector.
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