US 4,542,084 AGranted

Method for forming a colored image

AssigneeSony Corporation

InventorsHaruo Watanabe, Junetsu Seto, Kiyosuke Suzuki, Toshiaki Fukuma

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Abstract

A method for forming a color image includes a step of spraying three kinds of photoconductive toners with a sensitization wavelength band different from its absorption wavelength band, a step of electrically charging these different toners, a step of exposing these sprayed and electrically charged photoconductive toners to light for selectively removing electrostatic charges, and a step of removing the toners freed of electrostatic charges from the substrate. The magenta color photoconductive toners sensitive to red light, yellow color photoconductive toners sensitive to green light, and the cyan color photoconductive toners sensitive to blue light, are used as aforementioned three kinds of photoconductive colors.

Claims8

Dependent claims

A method for forming a colored image comprising the steps of:

(a) uniformly forming three kinds of photoconductive toners on a substrate, each of said photoconductive toners having an absorption wavelength band corresponding to one of red, green and blue light components of a natural light, each of said photoconductive toners having a sensitization wavelength band corresponding to one of red, green and blue light components of the natural light, and each of said photoconductive toners having said absorption wavelength band and said sensitization wavelength band different from each other;
(b) uniformly charging said photoconductive toners;
(c) obtaining three colors corresponding to three primary colors, that is, red, green, blue, from an original image to be reproduced;
(d) converting said three primary colors into three primary colors mutually different therefrom;
(e) exposing said photoconductive toners to a light with each of the converted three primary colors for selectively removing charges from a portion of said photoconductive toners;
and
(f) removing toners freed of charges from said substrate.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 06/634,151Filed 25 Jul 1984
Granted: 17 Sep 1985
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

G03G 13/016
For multicoloured copies: in which the colour powder image is formed directly on the recording material, e.g. DEP methods
G03G 2217/0058
Process where the image-carrying member is always completely covered by a toner layer: where the toner layer is being charged
Y10S 430/101
Electric or magnetic imagery, e.g., xerography, electrography, magnetography, etc. Process, composition, or product: photoconductive powder
G03G
Electrography