Sony Corporation

Tooru Tanaka

Mamoru Osato

Keiichi Ohta

A disk recording and/or reproducing apparatus performs recording information on and/or reproducing information from a disk-like recording medium within a sealed receptacle by the use of a head. In the apparatus, an optical encoder for detecting positions of the head with respect to the disk-like recording medium has such a scale plate as to be swingable on the arm shaft of a head arm together with the head arm, as to have scale marks engraved in the radius direction of the arm shaft, and as to consist of a single member in whole, so that a trouble such as the head is off the track due to a thermal influence and so forth, never occurs.

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Kanagawa, Japan

Tooru Tanaka