Single pass, two-color electrophotographic reproduction machine

Details Single pass, two-color electrophotographic reproduction machine Single pass, two-color electrophotographic reproduction machine

1988-12-12

1990-06-26

Grimley, A. T.

Photocopying

Contact printing

Light boxes

355326, G03G 1501

Patent

active

049376365

ABSTRACT:
A reproduction device forms a two-color output copy in a single pass mode. An original document, modified by the formation of a colored fluorescent material on selected portions thereof, is illuminated by a light source. The light reflected from the document is transmitted through a colored filter and is projected onto the surface of a monopolar photoreceptor. Light incident on a fluorescent material is absorbed over a specific wavelength range and is re-admitted at a higher wavelength. This light, and light reflected from the white background, are transmitted through a filter of a color associated with the re-emited wavelength. Light reaching the photoreceptor discharges charged areas thereon at two energy levels. The resulting latent image incorporates three separate discharge levels corresponding to the black image information, color fluorescent areas, and background areas. The black and color areas are developed with appropriate colored toner by developer units biased at the appropriate levels.

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patent: 4068938 (1978-01-01), Robertson
patent: 4078929 (1978-03-01), Gundlach
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patent: 4264185 (1981-04-01), Ohta
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patent: 4731634 (1988-03-01), Stark
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patent: 4777510 (1988-10-01), Russel
patent: 4849795 (1989-07-01), Spehrley, Jr. et l.

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