Patent ID: 7940629

Claim:
An information recording apparatus that causes information light and reference light to interfere with each other and records an interference image on a recording medium, the information recording apparatus comprising: A fixed light source that emits coherent light; a modulation element that modulates incident light to emit modulated light as information light having information that should be recorded on the recording medium; a splitting optical system that splits the light emitted from the light source into two light beams, leads one of the light beams to the modulation element, and leads the other to the recording medium as reference light; a Fourier transform optical system that leads the light emitted from the modulation element to the recording medium; and an optical path shifter located between the Fourier transform optical system and the recording medium and having an optical device configured to move relatively with respect to the fixed light source so as to move a recording spot in a circular shape around an optical axis of the Fourier transform optical system when the interference image is recorded.