Holographic memory medium, holographic memory device and holographic recording device
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United States of America Patent
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Jan 27, 2009
Grant Date -
Sep 20, 2007
app pub date -
Mar 20, 2006
filing date -
Mar 20, 2006
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Even when a tilt error is caused in a holographic memory in a direction perpendicular to a surface including optical axes of a signal beam and a reference beam, the signal beam and the reference beam are allowed to enter the holographic memory at adequate angles relative thereto at all times by suppression of the tilt error. During recording and reproducing operations, the reference incident angle of the reference beam in the radial tilt direction is detected based on a received light state. A tilt actuator for displacing the holographic memory medium in the radial tilt direction is driven to adjust an incident angle of the reference beam in the radial tilt direction to the reference angle Sr. Then, the signal beam and the reference beam are emitted to the holographic memory medium to execute the recording and reproducing operations.
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