Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Patent
1996-12-11
1998-12-29
Rodee, Christopher D.
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
430100, G03G 1309
Patent
active
058539417
ABSTRACT:
A method and apparatus for reducing triboelectrically generated background development on a photoconductive primary image member bearing an electrostatic latent image pattern including background portions. In an electrophotographic black and white or color copier/printer, the primary image member is moved through a development zone. The image member includes a photoconductive element and a thin protective overcoat layer, the overcoat layer being between 0.1 .mu.m and 15 .mu.m in thickness and of a composition having between about 0.1% and about 10% by weight of a material that is an ionic conducting material and containing an electronegative group. The latent electrostatic image pattern is formed on the overcoat layer. Electrographic developer includes hard magnetic carrier particles and electrically insulative toner particles and moves through the development zone in contacting developing relation with the electrostatic charge pattern. The developer is transported through the zone in response to rotation of a series of alternating polarity magnets formed in a core which effects tumbling of the carrier in the development zone. The toner particles are tribocharged so that substantially all of the particles are negatively charged and the toner particles have a volume weighted diameter of less than 9 .mu.m.
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Leone Salvatore
Rimai Donald Saul
Eastman Kodak Company
Rodee Christopher D.
Rushefsky Norman
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