Two color electrostatic copying machine

Details Two color electrostatic copying machine Two color electrostatic copying machine

G - Physics

03

G

314/12

G03G 15/01 (2006.01)

Patent

CA 1114004

ABSTRACT OF THE DISCLOSURE: A photoconductive drum is formed with inner and outer photoconductive layers of different spectral sensitivi- ties. First and second chargers apply electrostatic charges of opposite polarities to the drum to form a stratified charge pattern. Radiation of a light image onto the drum causes electrostatic images to be formed in the layers according to color, the net surface potential being negative in areas cor- responding to one color such as red, positive in areas corres- ponding to another color such as black and zero in white background areas. Firts and second developing units apply positively charged red toner and negatively charged black toner respectively to the drum to form a two color toner image. Where only one charger and only one developing unit is actuated for operation, a positive or negative copy in either color may be produced. The copying machine is operative in either of five copying modes merely by selectively actuating the chargers and developing units in correspondingly different combinations.

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