Patent ID: 7672209

Claim:
A hologram reproducing apparatus for reproducing recorded information from a holographic recording medium in which an interference pattern is recorded, the interference pattern being formed from object light corresponding to the information and reference light, said hologram reproducing apparatus comprising: an irradiating device for irradiating the reference light onto the holographic recording medium; a data generating device for generating detection data including recorded information, on the basis of detection light generated by the irradiation of the reference light; a setting device for setting a target irradiation position of the reference light on a surface of the holographic recording medium, on the basis of a positional relationship of markers included in the detection data; an error signal generating device for generating an error signal indicating a shift between a position of a guide, which is formed in advance on the holographic recording medium and indicates a reference irradiation position of the reference light, and a position which is actually irradiated with the reference light; a displacing device for displacing said irradiating device, relative to the holographic recording medium and along the surface, so as to irradiate the reference light in the target irradiation position, on the basis of the target irradiation position and the error signal; and a data demodulating device for correcting positions of pixels included in the detection data by performing geometric correction, on the basis of the positional relationship of the markers.