Patent ID: 7362687

Claim:
A holographic recording method for recording information as phase information of light by projecting a signal beam and a reference beam onto a recording medium, wherein an X direction is defined as the direction of a line of intersection between a plane including the optical axes of the signal beam and reference beam (incidence plane) and the recording plane of the recording medium, and the Y direction is defined as the direction of a line lying normal to the incidence plane and intersecting said line of intersection, comprising the steps of: using the reference beam modulated with a first phase code to record a first hologram at a predetermined position; using the reference beam modulated with a second phase code whose pattern is different from that of the first phase code to record at a position shifted in the Y direction a second hologram that partially overlaps the first hologram; and using the reference beam modulated with a third phase code whose pattern is different from that of first and second phase codes to record at a position shift in the Y direction a third hologram that partially overlaps the first and second holograms wherein a correlation between the third phase code and the second phase code is set lower than a correlation between the third phase code and the first phase code.