Optical scanner with electrooptical feedback for beam positionin

Details Optical scanner with electrooptical feedback for beam positionin Optical scanner with electrooptical feedback for beam positionin

1978-06-05

1980-06-03

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250235, G01J 120

Patent

active

042063485

ABSTRACT:
Apparatus for use in an optical scanner for accurately controlling, from scan to scan, the position in which the horizontal scan line is formed. A closed electrooptical feedback loop is employed to sense, prior to the formation of each horizontal scan line, the vertical position of the scanning light beam in the plane of the recording element and, in the event its position is displaced from a nominal position, to produce an error signal to move the beam to the nominal position.

REFERENCES:
patent: 2540016 (1951-01-01), Sunstein
patent: 2630548 (1953-03-01), Muller
patent: 2634325 (1953-04-01), Bond et al.
patent: 2657257 (1953-10-01), Lesti
patent: 2816246 (1957-12-01), Bliss
patent: 3033073 (1962-05-01), Shuttleworth
patent: 3536950 (1970-10-01), Johnston et al.
patent: 3809806 (1974-05-01), Walker et al.

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