Konica Minolta Opto, Inc.

Shigeru Yamasaki

Takeshi Endo

Tetsuya Noda

Hiroshi Hatano

Hiroyuki Matsuda

Kazutaka Noguchi

An optical information recording and reproducing apparatus relating to the invention employs a two-beam interference method. In the optical information recording and reproducing apparatus, a moving device moves an information recording medium between a recording and reproducing position and a retracting position, and a mirror moves together with the information recording medium. When the information recording medium moves to the recording and reproducing position, the mirror moves to a position which is displaced from the at least one of the reference beam and the information beam. When the information recording medium moves to the retracting position, the mirror moves to a position where the mirror can reflect the at least one of the reference beam and the information beam toward a detector for detecting a deviation of the at least one of the reference beam and the information beam.

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Saitama, Japan

Shigeru Yamasaki