G - Physics – 03 – G
Patent
G - Physics
03
G
32/12.12, 117/3.
G03G 13/10 (2006.01) G03G 15/10 (2006.01)
Patent
CA 1156879
Abstract of the Disclosure Our invention comprises an applicator roller positioned closely adjacent but not touching a photoconductive surface on which there is a latent electrostatic image to be developed. The surface of the latent image and the surface of the applicator move at synchronous speed and are spaced from each other. The applicator roller is adapted to be wetted with an electrophoretic type of developer liquid. The volume of developer liquid on the roller surface is controlled to within narrow limits. The developer liquid carries charged toner particles enabling the developer liquid to jump the gap between the applicator roller and the latent electrostatic image on the photoconductive surface. Our method and apparatus is such that substantially only the latent electrostatic image is moistened by developer liquid. The control of the volume of developer liquid on the applicator roller may be accom- plished by providing the surface of the applicator roller with re-entrant portions of predetermined capacity. This volume may also be controlled by using a smooth-surfaced applicator roller together with a closely-adjacent but spaced reverse doctor roller adapted to meter the thickness of the film on the smooth applicator roller. Post-transfer electro- phoresis is aided either by a field electrode biased to a potential of the same polarity as the polarity of the latent electrostatic field or by a corona discharge device biased to a potential opposite to that of the latent electrostatic field of the developed image. Owing to the fact that the developer liquid has a lower vapor pressure than the liquid component of liquid developers of the prior art and a higher ratio of toner particles to carrier liquid than the developing liquids of the prior art, substantially no evaporation of the carrier liquid occurs with our method and apparatus and our copies, when transferred to a carrier sheet, are substantially dry.
346257
Gardiner Kenneth W.
Swidler Ronald
Macrae & Co.
Savin Corporation
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