Photocopying – Contact printing – Light boxes
Patent
1990-06-19
1992-02-18
Pendegrass, Joan H.
Photocopying
Contact printing
Light boxes
355328, 430 42, G03G 1501
Patent
active
050898477
ABSTRACT:
An electrophotographic printing machine in which a color highlighted original document having black indicia and non-black indicia thereon is reproduced in a single cycle. An optical system exposes the charged portion of the photoconductive member to record an optical electrostatic latent image corresponding to the black indicia of the original document. The optical electrostatic latent image is developed with black marking particles. Thereafter, the photoconductive member is recharged and a raster exposure system exposes the charged portion of the photoconductive member to record a raster electrostatic latent image corresponding to the non-black indicia of the original document. The raster electrostatic latent image is then developed with non-black marking particles. The black and non-black marking particles are transferred to a copy sheet and permanently fused thereto forming a highlight color copy of the original document.
REFERENCES:
patent: 4027961 (1977-06-01), Starkweather
patent: 4045219 (1977-08-01), Bean
patent: 4236809 (1980-12-01), Kermisch
patent: 4255040 (1981-03-01), Weigl et al.
patent: 4374617 (1983-02-01), Fisli
patent: 4403848 (1983-09-01), Snelling
patent: 4660059 (1987-04-01), O'Brien
patent: 4731634 (1988-03-01), Stark
patent: 4937629 (1990-06-01), Maruyama et al.
Beck J. E.
Fleisher H.
Pendegrass Joan H.
Xerox Corporation
Zibelli R.
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