OPTICAL INFORMATION RECORD-PLAYBACK DEVICE AND OPTICAL INFORMATION RECORD-PLAYBACK METHOD

摘要

An optical information record-play device comprises a first controller unit, a reflector element, a second controller unit, and an image capture unit. The first controller unit controls a recording medium, whereon information is recorded as a hologram by interference between an information beam which includes the information that is recorded and which is emitted by a coherent light source and a reference beam having the same wavelength as that of the information beam, to rotate in a constant direction in a first period. The reflector element reflects the reference beam that passes through the recording medium. The second controller unit controls the reflector element to rotate such that an angle of incidence of a reflected reference beam that is reflected from the reflector element to the recording medium is constant in a second period. The image capture element captures a playback beam of the reflected reference beam passing through the recording medium in a third period within the second period.