Electro-static photo-copier machine

Details Electro-static photo-copier machine Electro-static photo-copier machine

1987-07-08

1989-04-11

Grimley, Arthur T.

Photocopying

Including fiber optics

355 3CH, 355 14CH, G03G 1500

Patent

active

048210765

ABSTRACT:
The copying machine of the present invention is capable of executing a reversal image forming mode wherein a toner is only deposited onto a non-image portion of the latent image to visualize. When the reversal image forming mode is designated, a screen member, which is movable to intrude into or extrude from the light path of the exposing means, is controlled to intrude into the light path of the exposing means to form a reversal image.

REFERENCES:
patent: 3967891 (1976-07-01), Rippstein
patent: 4014607 (1977-03-01), Cherian
IBM Technical Disclosure Bulletin, vol. 12, No. 8, Jan. 1970, Elzinga, "Reversal Development of Large Black Areas in an Electrophotographic Process", p. 1222.

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