Patent ID: 9081364
Filing Date: 2015-07-14
Classification: G03H,G11B

Abstract:
1. An optical information recording/reproducing apparatus to record and/or reproduce information on an optical information recording medium by using holography, the apparatus comprising: an angle detection unit which detects first angle information including a reference beam angle suitable to reproduce each of a plurality of angle correction data multiply-recorded on the optical information recording medium; and an angle correction unit which corrects a reference beam angle at the time of recording or reproducing operation based on the first angle information detected by the angle detection unit and second angle information including a reference beam angle at the time of recording each of the plurality of the angle correction data, wherein: when a reference beam angle suitable to reproduce an n-th-recorded angle correction data from a plurality of reference beam angles included in the first angle information is defined as θ the angle correction unit corrects the reference beam angle at the time of recording and reproducing operation by using where α is a coefficient including 1, and N is integer not less than 2.