Photocopying – Contact printing – Light boxes
Patent
1993-04-29
1994-04-19
Grimley, A. T.
Photocopying
Contact printing
Light boxes
346108, 346160, 355208, 355328, G03G 1501
Patent
active
053050690
ABSTRACT:
An image forming apparatus includes an electrophotographic photosensitive member; charging device for electrically charging the photosensitive member; one information light source for emitting light information to the photosensitive member, the light source being actuatable by electric power supply; light quantity control device for controlling the light source to produce a controlled quantity of light from the light source in accordance with image information; developing device for developing an electrostatic latent image formed on the photosensitive member, the developing device comprises first developing device for developing it with first toner, and second developing device for developing it with second toner having a color different from that of the first toner; wherein the control device comprises a reference current source for supplying a predetermined reference current, and a color current source for supplying currents predetermined for respective colors, and wherein in exposure for a pixel, the light source is supplied with a current which is a sum of a current from the reference current source and a current from the color current source, so that an electrostatic latent image having different potentials in accordance with colors of the image information is formed by a single image information exposure step.
REFERENCES:
patent: 4879576 (1989-11-01), Naito
patent: 4958189 (1990-09-01), Yoshida
patent: 4984021 (1991-01-01), Williams
patent: 4998118 (1991-03-01), Ng
patent: 5153609 (1992-10-01), Ando et al.
patent: 5255062 (1993-10-01), Oka et al.
Brase Sandra L.
Canon Kabushiki Kaisha
Grimley A. T.
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