Recording medium transducing light spot moving velocity detectio

Details Recording medium transducing light spot moving velocity detectio Recording medium transducing light spot moving velocity detectio

1989-01-31

1991-12-10

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4434, 369 54, G11B 7085

Patent

active

050724347

ABSTRACT:
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.

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patent: 4796113 (1989-01-01), Hayakawa
patent: 4796246 (1989-01-01), Tsuyoshi et al.
patent: 4887253 (1989-12-01), Tateishi

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