Patent ID: 7206105

Claim:
A hologram record apparatus comprising: a record light source for performing an irradiation with source light including signal light and reference light; a spatial light modulator disposed in an optical path of the signal light and divided into a plurality of cell blocks arranged in a matrix, each cell block divided into a plurality of cells arranged in a matrix of M by N (M, N=natural number not less than 2); an optical system for introducing the signal light passed through the spatial light modulator and the reference light onto a hologram record medium; and a control device for controlling the spatial light modulator to modulate the signal light using one or more cells occupying a part of each cell block as modulation units, depending on each of a plurality of record information to be recorded onto the hologram record medium, wherein the control device controls the spatial light modulator to record the plurality of record information overlappingly one after another, in each of a plurality of record areas corresponding to the plurality of cell blocks on the hologram record medium, by using the signal light modulated by the modulation units, and the modulation units exist in each cell block and have different cell patterns respectively.