Method of preventing colors from being mixed for a two-color ima

Details Method of preventing colors from being mixed for a two-color ima Method of preventing colors from being mixed for a two-color ima

1992-04-28

1994-01-04

Pendegrass, Joan H.

Photocopying

Contact printing

Light boxes

355326, 430 45, G03G 1308

Patent

active

052764877

ABSTRACT:
A method of preventing colors from being mixed in a two-color image forming apparatus. The surface of a photoreceptor is uniformly charged. A first latent electrostatic image formed on the photoreceptor surface is developed with a one-component developer so as to form a first toner image. A second latent electrostatic image formed on the photoreceptor surface is developed with a two-component developer so as to form a second toner image. The first and second toner images are simultaneously transferred onto a recording medium. In a preferred embodiment, the one-component developer is a magnetic toner, while the two-component developer is the combination of a nonmagnetic toner and a magnetic carrier. The magnetic toner and the magnetic carrier are preferably powder made of substantially the same materials.

REFERENCES:
patent: 4882247 (1989-11-01), Marugama et al.
patent: 4937630 (1990-06-01), Yoshikawa et al.
patent: 5009973 (1991-04-01), Yoshida et al.
patent: 5036362 (1991-07-01), Stelter

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