Optical information reproducing apparatus and optical information recording apparatus using holography

摘要

An optical information reproducing apparatus using holography is provided. The holographic optical information reproducing apparatus includes an objective lens (160) irradiating a reference beam to a predetermined position on a recording medium (200) and receiving a reproducing beam reproduced from the recording medium, an optical information detector (170) detecting the reproducing beam passing through the objective lens, a driving unit (196) changing a distance between the optical information detector (170) and the objective lens (160) and an image adjusting unit (180) adjusting magnification and a focus between an output image resulting from the reproducing beam passing through the objective lens and a detected image detected by the optical information detector with a variation in distance between the optical information detector and the objective lens.