Multiple beam optical scanning device wherein scanning control s

Details Multiple beam optical scanning device wherein scanning control s Multiple beam optical scanning device wherein scanning control s

1991-09-09

1992-10-13

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4438, 369 4441, G11B 700

Patent

active

051557177

ABSTRACT:
A scanning device including an optical head which generates three radiation beams for scanning a track in an information plane of a record carrier. The radiation from the record carrier produced by the respective beams is detected by respective detection systems. The resulting detection signals are combined to derive scanning control signals as well as a reference signal which corresponds to variations in and differences between the beam intensities. A divider circuit uses the reference signal to stabilize the control signals against such variations and differences in the beam intensities.

REFERENCES:
patent: 4446545 (1984-05-01), Van Dijk
patent: 4533826 (1985-08-01), van Alem
patent: 4797870 (1989-01-01), Nakai et al.
patent: 4983002 (1991-01-01), Shikama et al.

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