Two color electrostatic copying machine

Details Two color electrostatic copying machine Two color electrostatic copying machine

1978-10-05

1980-02-19

Moses, R. L.

Photocopying

Including fiber optics

118645, 355 10, 355 14R, G03G 1501

Patent

active

041892240

ABSTRACT:
A photoconductive drum (22) is formed with first and second photoconductive layers of different spectral sensitivities. First and second chargers (12), (14) apply electrostatic charges of opposite polarities to the drum (22) to form a stratified charge pattern. Radiation of a light image onto the drum (22) causes electrostatic images to be formed in the layers according to color, the net surface potential being negative in areas corresponding to one color such as red, positive in areas corresponding to another color such as black and zero in white background areas. First and second developing units (27), (28) apply positively charged red toner and negatively charged black toner respectively to the drum (22) to form a two color toner image. Where only one charger (12), (14) and only one developing unit (27), (28) is actuated for operation, a positive or negative copy in either color may be produced. The copying machine (21) is operative in either of five copying modes merely by selectively actuating the chargers (12), (14) and developing units (27), (28) in correspondingly different combinations.

REFERENCES:
patent: 3960445 (1976-06-01), Drawe
patent: 4076404 (1978-02-01), Nagamatsu et al.

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