HOLOGRAPHIC MEMORY MEDIUM, HOLOGRAPHIC MEMORY DEVICE AND HOLOGRAPHIC RECORDING DEVICE

摘要

PROBLEM TO BE SOLVED: To suppress a tilt error even when the 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 (radial tilt direction). SOLUTION: A reference tilt hologram for specifying a reference incident angle in the radial tilt direction is recorded in advance on a holographic memory medium. During recording and reproducing operations, the reference beam is emitted to a recording position of the reference tilt hologram and the reference incident angle (reference angle Sr) of the reference beam in the radial tilt direction is detected based on a received light state. A tilt actuator 19 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. COPYRIGHT: (C)2008,JPO&INPIT