Color electrophotographic process

Details Color electrophotographic process Color electrophotographic process

1974-11-14

1977-02-08

Martin, Jr., Roland E.

Gas separation: apparatus

Magnetic separating means

96 14, 355 4, G03G 1322

Patent

active

040070441

ABSTRACT:
An overcoated photoconductive material is uniformly illuminated in the presence of an electric field to create persistent internal polarization. Minute, translucent toner particles are then applied onto the surface of the photoconductive member, and a colored light image is projected onto the surface of the photoconductive member through the toner particles. Equal numbers of the toner particles are colored in three primary colors respectively to form a tri-color mosaic pattern on the surface of the photoconductive member. Each particle absorbs light of its complementary color during the imaging step so that the internal polarization is dissipated in a pattern corresponding to a colored positive of the light image as quantized by the colored mosaic of toner particles. The particles which absorbed light, constituting a colored negative of the light image, are then selectively frictionally removed from the surface of the photoconductive member since the charge holding them to the surface is weak. The remaining particles, constituting a quantized positive of the light image, are then electrostatically transferred to a sheet of recording paper and fixed thereto to provide a positive colored copy. The particles which absorbed light may also be electrostatically transferred to a sheet or film of recording medium as a negative colored copy.

REFERENCES:
patent: 2924519 (1960-02-01), Bertelsen
patent: 3100426 (1963-08-01), Kaprelian
patent: 3166418 (1965-01-01), Gunolach
patent: 3392642 (1968-07-01), Germer
patent: 3413117 (1968-11-01), Gaynor
patent: 3807998 (1974-04-01), Kinoshita
patent: 3884686 (1975-05-01), Bean

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