Electrophotographic process using separate photoconductive eleme

Details Electrophotographic process using separate photoconductive eleme Electrophotographic process using separate photoconductive eleme

1975-03-31

1976-06-15

Martin, Jr., Roland E.

Gas separation: apparatus

Magnetic separating means

96 1LY, 96 1SD, G03G 1304, G03G 1306, G03G 1322

Patent

active

039634876

ABSTRACT:
An electrophotographic process comprising (1) arranging (a) a main photoconductive layer disposed on a conductive base, on the surface of which a charge is uniformly provided, and (b) an auxiliary photoconductive layer, disposed on a light transmissive conductive layer on the surface of which is provided charge opposite to that on the main photoconductive layer, to face each other across a small distance, (2) simultaneously forming, by image exposure to the same original from the back of the auxiliary photoconductive layer, electrostatic latent images on both the layers where the product of relative sensitivity ratio and relative exposure ratio of the main photoconductive layer is 2 to 1000 times greater or less than the product of relative sensitivity ratio and relative exposure ratio of the auxiliary photoconductive layer, and (3) thereafter supplying a developer between the layers while still facing each other for developing the latent image on the main photoconductive layer, the developed image reproducing gradations in tone of the original due to the latent image on the auxiliary photoconductive layer.

REFERENCES:
patent: 3311490 (1967-03-01), Fauser et al.
patent: 3551145 (1970-12-01), Trachtenberg
patent: 3620798 (1971-11-01), Honjo et al.
patent: 3888666 (1975-06-01), Matsumoto et al.

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