Sony Corporation

Masataka Ogawa

Seiji Kobayashi

Hiroshi Sumihiro

Yoshihiro Tsukamura

Masamichi Kondo

A magnetic head applies a magnetic field to a desired area when recording an information signal on the desired recording area of a magneto-optical disk. This magnetic head comprises a printed circuit board and a coil formed on at least one of the surfaces of the printed circuit board by a conductor pattern. This magnetic head can be made smaller, lighter and thinner than conventional magnetic heads.

Printed circuit board magnetic head for magneto-optical recording device

A disk-shaped recording medium has a control record region in each recording region of successive recording tracks and which is divided into a first preformat region, a second preformat region and a focusing servo region arranged in succession in the direction along the respective track and respectively providing traverse data, tracking and clock data, and focusing servo data. An apparatus for reproducing data recorded in the tracks of such disk-shaped recording medium samples a playback output from an optical head scanning a track to detect focusing data from the focusing servo region and tracking data from the second preformat region and, in response thereto, applies focusing servo or tracking servo to the optical head. Further, traverse data is detected in the first preformat region to effect traverse counting of the recording tracks.

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Chiba, Japan

Masataka Ogawa