Galvo position sensor for track selection in optical data disk s

Details Galvo position sensor for track selection in optical data disk s Galvo position sensor for track selection in optical data disk s

1981-12-21

1984-08-14

McElheny, Jr., Donald

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369 55, 369111, G11B 700

Patent

active

044660880

ABSTRACT:
Disclosed is a radiant energy optoelectronic position monitor system which detects the angular position of a "galvanometer mirror" (beam scanner) used in an optical disk memory arrangement. Using a single infra-red monitor beam, angular motion is converted to linear displacement of an image on a detector cell so as to produce a corresponding electrical signal. This signal is presented to a processing circuit with an analog divider to normalize output scale factor. The result is a high gain electrical circuit for recovering output signals in an environment with strong magnetic interference.

REFERENCES:
patent: 2237902 (1941-04-01), Dimmick
patent: 4264809 (1981-04-01), Fearnside
patent: 4290122 (1981-09-01), Bates et al.
patent: 4330880 (1982-05-01), Van Dijk
patent: 4352984 (1982-10-01), Ohara
patent: 4363116 (1982-12-01), Kleuters et al.
Paul M. Trethewey, "An Infra-Red Based Beam Scanner Position Sensor", Wescon Electronic Show & Convention, Sep. 15-17, 1981, Brooks Hall & Civic Auditorium, Hilton Hotel, San Francisco, California, Region 6, IEEE Student Paper Competition, pp. 1-8.

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