Copying machine having detectors for the background color and de

Photocopying – Projection printing and copying cameras – Combined with or convertible to a contact printer

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355 14E, 118691, G03G 1500

Patent

active

043726747

ABSTRACT:
An apparatus for facilitating creation of an improved quality reproduction of an original to be copied includes a first sensor for producing a signal in accordance with the density of the background or nonimage are of the original, a second sensor for producing a signal in accordance with the color of its background, and electronic circuit means for generating a bias voltage based on the sensed density and color of the background of the original for application to a developing apparatus.

REFERENCES:
patent: 2956487 (1960-10-01), Giaimo, Jr.
patent: 3876106 (1975-04-01), Powell et al.
patent: 4025184 (1977-05-01), Mochizuki
patent: 4043293 (1977-08-01), Ruckdeschel
patent: 4087171 (1978-05-01), Yano
patent: 4111151 (1978-09-01), Ruckdeschel
patent: 4153364 (1979-05-01), Suzuki et al.
patent: 4239374 (1980-12-01), Tatsumi et al.

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