OPTICAL INFORMATION REPRODUCTION APPARATUS, OPTICAL INFORMATION REPRODUCTION METHOD, AND OPTICAL INFORMATION RECORDING METHOD

摘要

PROBLEM TO BE SOLVED: To accurately locate a book at a reference-light irradiation position at a time of reproducing a hologram on a recording medium.SOLUTION: An optical information reproduction device for reproducing information from an optical information recording medium 1 includes: a light source emitting reference light; an angle adjustment unit 319 that adjusts an incident angle at which the reference light emitted from the light source is incident on the optical information recording medium 1; a filter unit 314 that suppresses unnecessary light of diffraction light obtained when the reference light angle-adjusted by the angle adjustment unit 319 is radiated on the optical recording medium 1; a photodetector 201 that detects at least part of the diffraction light obtained when the reference light angle-adjusted by the angle adjustment unit 319 is radiated on the optical information recording medium 1; and a control unit that controls the filter unit 314. Information is recorded on at least part of page data in each adjacent book of the optical recording medium with the incident angle of the reference light offset in an angle multiplexing direction. The control unit controls the filter unit 314 on the basis of a signal detected by the photodetector 201.