Patent ID: 7903310

Claim:
A hologram recording and reproducing apparatus for recording holograms to be formed by a signal beam carrying certain two-dimensional data, and a reference beam to be emitted from a light source for emitting the signal beam in a certain recording area of a hologram recording medium multiple times, and for reproducing the recorded holograms by irradiating the reference beam, the apparatus comprising: a reaction rate information acquiring section for acquiring reaction rate information representing a reaction rate at which the hologram having an intended diffraction efficiency is formed for recording in the hologram recording medium by the light irradiation; a recording interval time determining section for determining a recording interval time from the point of time when light is irradiated to record a certain hologram of the holograms to be multiplex-recorded to the point of time when light is irradiated to record a succeeding hologram in such a manner that at least parts of the holograms are recorded one over the other in the certain recording area based on the reaction rate information acquired by the reaction rate information acquiring section; and a controlling section for controlling the light to be irradiated from the light source depending on the recording interval time determined by the recording interval time determining section.