Patent ID: 7583424

Claim:
A hologram information reproducing device comprising: a light source unit that emits reference light; an optical system that irradiates with the reference light, a recording medium on which information is recorded in a multiplex manner; and detecting means that is disposed on the same side as the light source unit with respect to the recording medium and that detects reproduction light that is obtained as a result of diffracting the reference light at the recording medium, wherein the optical system includes a lens that transmits the reference light emitted from the light source unit, a mirror that directs the light transmitted through the lens towards the recording medium, and a first driver that changes the orientation of the lens, and wherein the first driver changes the orientation of the lens in a multiplex direction of the information recorded on the recording medium when the information is reproduced from the recording medium, the multiplex direction corresponding to a direction substantially perpendicular to a surface of the recording medium.