Document reader with light source control

Details Document reader with light source control Document reader with light source control

1986-09-10

1987-06-30

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250235, 358293, G01J 132, H04N 110

Patent

active

046772871

ABSTRACT:
A document reader has a light source which is turned on upon energization, a read unit for reading an image of a document illuminated by the light source and a control circuit for controlling the energization of the light source. The read unit reads an intensity of a light reflected by a reference density pattern arranged externally of a document area prior to reading of the document and controls the energization of the light source in accordance with the detected light intensity.

REFERENCES:
patent: 4097732 (1978-06-01), Krause et al.
patent: 4174528 (1979-11-01), White
patent: 4250488 (1981-02-01), Haupt
patent: 4250526 (1981-02-01), Fuwa et al.
patent: 4270131 (1981-05-01), Tompkins et al.
patent: 4352553 (1982-10-01), Hirahara

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