Nakamichi Corporation

Tosihiko Otomo

Gohji Uchikoshi

A moving velocity detection circuit to detect the moving velocity and direction of motion for an optical spot. Detectors provide sine wave signals having periods inversely proportional to the moving velocity and having phases advanced or delayed opposite the direction of rotation. Deformed and differential signals derived from the detection signals are used to provide half wave signals which are added and subtracted in a predetermined combination, the polarity of which indicate direction of movement and the absolute value of which indicate velocity.

Recording medium transducing light spot moving velocity detection circuit

An optical spot position detection device for an optical disk apparatus able to detect a track position of an optical spot on the recording tracks of an optical disk by dividing a space between centers of adjacent recording tracks into four areas and indicating one of the four areas where the optical spot exists so that a control signal for the optical spot can be provided.

Growing community of inventors

Tokyo, Japan

Tosihiko Otomo