Patent ID: 9373352
Filing Date: 2016-06-21
CPC Classification: G02B,G03H,G11B

Claim Text:
1. An optical information reproduction apparatus which reproduces information from an optical information recording medium by using holography, the apparatus comprising: a laser beam source which generates a reference beam; a multiplexing angle adjustment element which adjusts an angle of the reference beam in a multiplexing direction; a perpendicular angle adjustment element which adjusts an angle of the reference beam in a direction perpendicular to multiplexing; an imaging device which detects diffraction light which is to be reproduced from the optical information recording medium; an optical axis division element which divides the reference beam into at least two reference beams having different angles in the multiplexing direction; and a light detecting unit which has at least two light receiving surfaces or more detecting diffraction light which is reproduced by irradiating the optical information recording medium with the divided reference beams in a state where an angle of the divided reference beams in the multiplexing direction is shifted from an optimal angle.