HOLOGRAM REPRODUCING DEVICE AND HOLOGRAM REPRODUCING METHOD

摘要

A hologram reproducing device is provided with a reproduction reference beam splitting means (11) for splitting a reference beam (R'), at the time of reproduction, into a main beam (R0) in a main incidence direction to a hologram recording medium (H) and sub-beams (R1, R2) in incidence directions spatially shifted from the main beam; an incidence direction variable irradiation means (20) which changes incidence directions of the main beam (R0) and the sub-beams (R1, R2); a servo beam detecting means (50) for detecting a part of a reproduction beam (P) generated corresponding to the sub-beams (R1, R2) as servo beams (P1, P2); a beam receiving means (32) for receiving the main portion (P0) of the reproduction beam (P) generated corresponding to the main beam (R0); and a reproduction means (60) for reproducing an image obtained from the beam receiving means (32), after the main beam (R0) is aligned with an incidence direction where a beam receiving quantity of the beam receiving means (32) is at a prescribed level or more when the intensity of the reference beam is made constant, based on the results of detection of the servo beams (P1, P2).