Method for forming multi-color images

Details Method for forming multi-color images Method for forming multi-color images

1989-11-21

1991-11-05

Goodrow, John

Radiation imagery chemistry: process, composition, or product th

Electric or magnetic imagery, e.g., xerography,...

To produce color reproduction

430126, 355326, G03G 1501

Patent

active

050631276

ABSTRACT:
A first electrostatic latent image on an image bearer is developed with a first toner in a first developing unit, and a second electrostatic latent image thereon is developed with a second toner in a second developing unit, wherein the first toner is transmittable to the image bearer at a lower bias voltage than the second toner, and wherein the second toner and a foreign first toner mixed in the second developing unit are chargeable to the same polarity by friction with a carrier contained in the second developing unit; the second developing unit is put into operation for a non-image forming portion of the image bearer by applying a voltage thereto wherein the voltage is maintained higher than the surface potential of the non-image forming portion so as to enable the foreign first toner to adhere thereto.

REFERENCES:
patent: 4264185 (1981-04-01), Ohta
patent: 4416533 (1983-11-01), Tokunaga et al.
patent: 4822702 (1989-04-01), Hoshi et al.
patent: 4937630 (1990-06-01), Yoshikawa et al.

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