Electrophotographic method for the formation of two-colored imag

Details Electrophotographic method for the formation of two-colored imag Electrophotographic method for the formation of two-colored imag

1984-06-15

1985-06-18

Welsh, John D.

Radiation imagery chemistry: process, composition, or product th

Electric or magnetic imagery, e.g., xerography,...

To produce color reproduction

430 45, 430 55, 355 4, G03G 1301

Patent

active

045241171

ABSTRACT:
An electrophotographic method for the formation of two-colored images comprising: (1) uniformly charging the surface of a photoreceptor having a conductive substance and a photoconductive layer formed on the conductive substance, said photoconductive layer being sensitive to a first color, (2) exposing a two-colored original, to form on said photoconductive layer an electrostatic latent image, which corresponds to a second color region in the original, with the same polarity as the electric charges on the surface of said photoconductive layer, (3) subjecting the surface of said photoreceptor to a reversal development treatment by the use of a photoconductive color toner charged with the same polarity as the electric charges constituting said electrostatic latent image, to develop the non-charged region with the photoconductive color toner, (4) subjecting said electrostatic latent image to a normal development treatment by the use of an insulative toner having a color different from the color of said photoconductive color toner, and (5) charging the color toners on said photoconductive layer with a different polarity from the charging polarity in process (1) and simultaneously exposing said original through a filter shielding against said first color, thereby providing a practical method for the formation of a desired two colored distinct image corresponding to the original.

REFERENCES:
patent: 3748125 (1973-07-01), Hercock et al.
patent: 4007045 (1977-02-01), Ishida et al.

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