Patent ID: 8228577
Filing Date: 2012-07-24
Classification: G03H,G11B

Abstract:
1. A hologram recording apparatus wherein holograms corresponding to incident angles of reference light are multiple-recorded onto a hologram recording medium by interferences between recording light and the reference light, comprising: a recording light projection unit projecting the recording light modulated in accordance with recording information, onto a region of the hologram recording medium; a reference light projection unit projecting the reference light onto the hologram recording medium by intermittently changing an incident angle relative to the region; an incident-angle variation projection unit moving the reference light projection unit for intermittently changing the incident angle of the reference light; an incident-angle switching instruction unit giving an instruction for switching the incident angle; a feed-back control unit operating said incident-angle variation projection unit by a feed-back control when the switching instruction of the incident angle has been given; and a feed-forward compensation unit learning a feed-back control signal which is outputted every switching instruction of the incident angle from said feed-back control unit, and making a feed-forward compensation as to a next feed-back control signal on the basis of a result of the learning.