Patent ID: 7952776

Claim:
A hologram reading apparatus comprising: a holding unit that holds a hologram recording medium in which data page is recorded by irradiating as a single beam both reference light and signal light which are modulated by a spatial light modulator, wherein the spatial light modulator includes a first pixel area for modulating the reference light and a second pixel area for modulating the signal light based on data page to be recorded, and a direction of an arrangement period of pixels in the first pixel area is different from that in the second pixel area; a Fourier transform lens that subjects reproduction light, which is reproduced by irradiating the reference light to the hologram recording medium, to a Fourier transformation; a filter disposed on a Fourier transform plane of the reproduction light by the Fourier transform lens, wherein the filter shields the reference light at a first spatial frequency band and transmits the signal light at a second spatial frequency band, based on that the reference light and the signal light which are included in the reproduction light differ from each other in direction of a period of image formation positions of a spatial frequency component thereof; and a reading unit that receives the reproduction light transmitted through the filter and reads the data page modulated to the signal light included in the reproduction light, wherein the arrangement period of pixels is an arrangement period of respective physical locations of immediately adjacent pixels, as opposed to an arrangement period of respective light intensities modulated by the pixels.