Multicolor image forming apparatus using chargers with opposite

Details Multicolor image forming apparatus using chargers with opposite Multicolor image forming apparatus using chargers with opposite

1989-09-21

1992-03-17

Grimley, A. T.

Photocopying

Contact printing

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355225, 355326, G03G 1501

Patent

active

050972960

ABSTRACT:
An image forming apparatus wherein a multicolored image of an original is formed in color on a sheet in one cycle of image forming operation. The apparatus comprises a plurality of developing devices which are filled with respective developers colored differently from each other and a scorotoron charger disposed between the developing devices for recharging on electrostatic latent image on a photosensitive member processed by the upstream developing device with the polarity opposite to the polarity charged beforehand. The developing device located upstream of the scorotron charger functions to develop the imaged portions including primary information which were charged with first potential. The scorotron charger recharges the electrostatic latent image with the opposite polarity, thereby lowering the potential of the other imaged portions including background information which were charged with second potential. The image portions charged with the second potential are developed in low density by the downstream developing device, portions with the second potential finely contrast with each other can be formed.

REFERENCES:
patent: 4562130 (1985-12-01), Oka
patent: 4794062 (1988-12-01), Oka et al.
patent: 4821071 (1989-04-01), Oka et al.
patent: 4984021 (1991-01-01), Williams
patent: 4994854 (1991-02-01), Miyamato

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