Copying process with patterned charge injection into charge tran

Details Copying process with patterned charge injection into charge tran Copying process with patterned charge injection into charge tran

1985-03-20

1986-05-06

Martin, Roland E.

Radiation imagery chemistry: process, composition, or product th

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

Post imaging process, finishing, or perfecting composition...

430 31, 430 56, 430 58, 430 59, 430 60, G03G 1322, G03G 514

Patent

active

045871930

ABSTRACT:
A copying process in which a pattern of charged and uncharged areas is superimposed on a charge image by charging and exposing image-wise an electrophotographic element which is provided with a charge-transporting top layer having therebeneath a charge-generating layer which can inject charges into the charge-transporting top layer at areas corresponding to said pattern of uncharged areas, but cannot inject charges into the other areas of the charge-transporting top layer. The charge image is developed with a developing powder having a resistivity of less than 10.sup.12 ohms.multidot.cm and the resulting powder image is transferred to a receiving material and fixed thereon. The pattern of charged and uncharged areas is provided to produce a uniform light-grey image where desired.

REFERENCES:
patent: 2917385 (1959-12-01), Byrne
patent: 3337339 (1967-08-01), Shelling
patent: 3341326 (1967-09-01), Shelling
patent: 3676118 (1972-07-01), Mott et al.
patent: 4369242 (1983-01-01), Armilli et al.
Gamblin, "Electrophotographic Halftone System", IBM Tech. Discl. Bull., vol. 18, No. 10, Mar. 1976.

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