US 4,686,163 AGranted

Electrophotographic color imaging method

AssigneeEastman Kodak Company

InventorsYee Seung Ng, Lawrence E. Contois, John D. Mitchell, James D. Walling

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Abstract

An electrophotographic imaging method is described that uses an element comprising a photoconductive layer on an electrically conducting substrate capable of transmitting actinic radiation to which the photoconductive layer is responsive, and a dielectric support, releasably adhered to the substrate, comprising the photoconductive layer or an overcoat thereof forming a surface of the element capable of holding an applied electrostatic charge. To use the element, the surface of the dielectric support is charged, and the photoconductive layer is imagewise-exposed to actinic radiation, thereby forming a developable electrostatic image on the dielectric surface. The electrostatic image, in turn, is developed with toner to form a first color image. A composite color image is formed on the element by repeating the sequence one or more times with imagewise exposure of the photoconductive layer to actinic radiation transmitted through the substrate, and developing over each preceding image with a different color toner. The composite toner image is transferred with the dielectric support to a receiving element to form a color copy such as a three-color filter array or a color proof closely simulating the color print expected from a full press run.

Claims10

Dependent claims

A color imaging method comprising:

(I) forming a first color image on the dielectric support of an electrophotographic element, comprising:
(a) a photoconductive layer on an electrically conductive substrate capable of transmitting actinic radiation to which the photoconductive layer is responsive and
(b) a releasable transparent dielectric support comprising the photoconductive layer or an overcoat thereof, forming a surface of the element capable of holding an applied electrostatic charge, by
(i) overall charging the surface of the dielectric support,
(ii) imagewise-exposing the photoconductive layer to actinic radiation to form a first electrostatic image on the surface of the dielectric support, and
(iii) developing the first electrostatic image with a first color developer composition to form the first color image,
(II) forming a second color image over the first color image on the surface of the dielectric support by
(iv) overall charging the surface of the dielectric support and first color image,
(v) while the dielectric support and first color image are still charged, imagewise-exposing the photoconductive layer to actinic radiation through the substrate to form a second electrostatic image, and
(vi) developing the second electrostatic image with a second color developer composition to form the second color image,
(III) contacting the surface of the dielectric support having the color images thereon with a transparent receiving element, and
(IV) transferring the dielectric support and color images to the receiving element to form a multicolor image transparency.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 06/859,273Filed 2 May 1986 · continuation in part
Priority: 26 Dec 1984
Granted: 11 Aug 1987
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

G03G 5/12
Recording-members for original recording by exposure, e.g. to light, to heat or to electrons; Manufacture thereof; Selection of materials…
G03F 3/105
Checking the colour or tonal value of separation negatives or positives: using electro photographic materials
G03G 13/01
Electrographic processes using a charge pattern: for multicoloured copies
G03G
Electrography