Image forming apparatus having at least two-color image print fu

Details Image forming apparatus having at least two-color image print fu Image forming apparatus having at least two-color image print fu

1987-10-21

1988-12-13

Prescott, A. C.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 3DD, 355 3R, G03G 1500

Patent

active

047914521

ABSTRACT:
Single-colored image printing and multi-colored image printing are carried out by an image forming apparatus in response to color signals. The image forming apparatus includes an image carrier, a first image forming unit having a first developer wherein a first color developing agent is stored, and a second image forming unit having a second developer wherein a second color developing agent is stored.
A single color image is formed on the image carrier when only a first color signal is received by the apparatus in the single-colored image printing. When a single-colored image printing is carried out by the first developer, a prescribed bias voltage is applied to the second developer to prevent the second color developing agent from the contamination by the first color developing agent of the single color image formed on the image carrier.

REFERENCES:
patent: 3936171 (1976-02-01), Brooke
patent: 4294534 (1981-10-01), Snelling
patent: 4552449 (1985-11-01), Wakamatsu et al.
patent: 4572651 (1986-02-01), Komatsu et al.
patent: 4705394 (1987-11-01), Watanabe
Nikkei Electronics, pp. 123-132, issued Oct. 6, 1986 "Two Color Laser Printer Which is Looking About the Timing of Sale".

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