Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1977-06-30
1978-08-08
Tokar, M.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250568, 365127, 235454, G06K 710
Patent
active
041059263
ABSTRACT:
A scanner for reading binary digit spots on a transparent film includes a laser light beam which is directed through a beam splitter and through the film to a mirror, from which it is reflected back through the film to illuminate a small area on the film. Light which is not blocked by a recorded spot on the film continues back to the beam splitter, from which the beam is directed to a photodetector. The photodetector is positioned to receive light from solely a portion of the illuminated area of the film, to provide high definition scanning not adversely affected by distortion of the illuminating light beam by imperfections in the film and mirror.
REFERENCES:
patent: 3403262 (1968-09-01), Seidel
patent: 3919698 (1975-11-01), Bricot
T. J. Harris, Optical Memory Readout Apparatus, IBM Tech. Bul., vol. 7, No. 12, May 1965, p. 1199.
Herzog Donald G.
Reno Charles W.
Christoffersen H.
Cohen Samuel
Olson Carl V.
RCA Corporation
Tokar M.
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