Patent ID: 7576899

Claim:
A hologram recording device for recording interference fringes between reference light and signal light modulated by data displayed in a spatial modulator in a hologram recording material, said hologram recording device compnsing: the spatial modulator comprised of a plurality of pixels, which is configured to display a minimum unit of display data over multiple pixels of the spatial modulator, the minimum unit of display data being a size less than a total number of pixels in the spatial modulator; a phase mask for diffusing light and comprised of a plurality of pixels, said phase mask being disposed in an optical system that said signal light passes through, wherein a minimum unit of a light diffusing pattern formed in said phase mask is a size that is a natural number of times the size of the minimum unit of display data of said spatial modulator, and the light diffusing pattern is a distribution of one or more portions of the phase mask which perform phase modulation on the signal light passed through the signal modulator, the minimum unit of the light diffusing pattern being a size that is less than a total number of pixels used in the light diffusing pattern.