Patent ID: 7489427

Claim:
A hologram recording device configured to perform multiple recording of data in a same recording region by varying an angle of incidence of a reference beam on a hologram recording medium at a time of recording an interference fringe of said reference beam and a signal beam on said hologram recording medium, said hologram recording device comprising: a reference beam incidence angle control unit configured to determine a plurality of angles of incidence of the reference beam within a predetermined range, by determining for at least a first angle of incidence of the plurality of angles of incidence a first angular pitch based on the first angle of incidence, and determining a second angle of incidence of the plurality of the angles of incidence by adding the first angular pitch to the first angle of incidence, and determining a second angular pitch based on the second angle of incidence, wherein respective angular pitches correspond to respective differences between the plurality of angles of incidence and said respective angular pitches have varying values.