OPTICAL INFORMATION RECORDING/REPRODUCING APPARATUS, DIFFRACTION-GRATING FABRICATING APPARATUS, OPTICAL INFORMATION RECORDING MEDIUM, AND POSITIONING CONTROL METHOD

摘要

PROBLEM TO BE SOLVED: To attain a correct multiple recording by appropriately detecting servo information by a simple configuration even in either case of information recording and information reproducing.;SOLUTION: The optical information recording/reproducing apparatus includes: an optical system that collects an information beam and a reference beam to a holographic memory recording medium 10 having a hologram recording layer 13 and a diffraction grating 15 disposed in the hologram recording layer 13, and guides a servo laser beam A into the diffraction grating 15 to transmit it; photodetectors 1 and 3 that detect diffracted transmitted beams A1 and A3 diffracted and transmitted by the diffraction grating 15; an actuator 242 that moves the holographic memory recording medium 10; and an adjusting unit 240 that controls the actuator 242 based on intensities of the diffracted transmitted beams A1 and A3 detected by the photodetectors 1 and 3, and adjusts a position or an angle of the holographic memory recording medium 10.;COPYRIGHT: (C)2009,JPO&INPIT