Patent ID: 7394581

Claim:
A hologram recording apparatus comprising: a laser light source for emitting first laser light; a first light splitter for splitting the first laser light emitted from the laser light source into a first signal beam and a first reference beam; a light modulator for modulating the first signal beam split by the first light splitter; a phase modulator for phase-modulating the first reference beam split by the first light splitter; an optical system for collecting the first signal beam modulated by the light modulator and the first reference beam phase-modulated by the phase modulator onto almost the same collecting position on a hologram recording medium; a collecting-position control mechanism for controlling the collecting position along a surface of the hologram recording medium; and a distance control mechanism for controlling the distance between the phase modulator and the hologram recording medium; and further wherein the collecting-position control mechanism includes an optical system driving unit that drives the optical system and the phase modulator to control the collecting position alone the surface of the hologram recording medium.