Optical image reader for reading an image on a given manuscript

Details Optical image reader for reading an image on a given manuscript Optical image reader for reading an image on a given manuscript

1984-08-28

1987-01-13

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

358213, 358294, H04N 1032

Patent

active

046366504

ABSTRACT:
An optical image reader is disclosed which effects the reading of an image on a given manuscript by projecting beams pf light on the manuscript, receiving the reflected beams of light from the read points in a plurality of optical fibers and discerning the image in accordance with the amount of light received in the optical fibers. This optical image reader is so constructed as to detect variations in the output voltage levels of an amplifier serving to amplify detection signals derived from the read points and, based on the variations so detected, cause the output voltage levels of the amplifier to be constantly controlled at a fixed level. Thus, the adjustment required for stabilizing the reading of an image is simplified and the reading of an image is effected accurately and precisely in spite of aging.

REFERENCES:
patent: 4225883 (1980-09-01), Van Atta et al.
patent: 4554460 (1985-11-01), Klein

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