Patent ID: 7031038

Claim:
A hologram apparatus for hologram recording and/or reproducing information data with a recording medium by use of a coherent light beam, comprising: a light beam generating section for generating a reference light beam and a coherent light beam coherent to the reference light beam; a spatial light modulator for spatially modulating the coherent light beam; a signal light beam generating section for driving the spatial light modulator by superimposing distortion-detecting data for detecting a distortion of a hologram-reproduced image on the information data to generate a signal light beam; a light beam interfering section for allowing the reference light beam and the signal light beam to enter the recording medium and causing interference, so as to form a hologram recording region by means of interference light; a reproducing section for allowing the reference light beam to be incident on the hologram recording region and generating a reproduced light corresponding to the signal light beam; an image sensor section for receiving the reproduced light to detect a hologram-reproduced image; a distortion determining section for detecting the distortion-detecting data from the hologram-reproduced image to determine a distortion of the hologram-reproduced image; a distortion corrector for correcting a distortion of the hologram-reproduced image; and a controller for adjusting the distortion corrector in accordance with a distortion determined by the distortion determining section to correct a distortion of the hologram-reproduced image.