G - Physics – 03 – G
Patent
G - Physics
03
G
314/14
G03G 15/04 (2006.01) G03G 13/09 (2006.01)
Patent
CA 1168298
ABSTRACT OF THE DISCLOSURE A bimodal electrophotographic apparatus and process which incorporates capabilities for making both positive and reversal copies. One surface of a layer of a zinc oxide coated paper, or the like, is given an initial electrostatic charge. The charged surface is then exposed to an image having light and dark areas for causing surface charge to dissipate, in varying degree depending on the amount of light striking the charged paper, in the exposure areas. A charged toner is applied to the zinc-oxide-coated paper by a magnetic brush. In the reversal mode, the brush has a bias potential. The brush is formed by an aggregation of magnetic toner particles clinging to the outside of a cylindrical sleeve while magnets inside the sleeve rotate. The toner collects on the paper to form an image depending upon where the charge is dissipated. A paper supporting shoe having an electrically insulated structure is located beneath the coated paper, with the insulation in the area where it passes adjacent the magnetic brush so that no current can pass through the toner after it is deposited onto the coated paper. Preferably, a pair of fuser rollers are electrically insulated so that when they come in contact with the surface of the coated material, after the toner is deposited thereon, they do not dissipate the image-caused charge. The fusing rollers may also be given a bias corresponding to the bias on the toner, for the same reason.
366866
Bell & Howell Company
Meredith & Finlayson
LandOfFree
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