Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – To produce color reproduction
Patent
1995-03-27
1997-07-15
Martin, Roland
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
To produce color reproduction
430126, 399298, G03G 1301, G03G 1314, G03G 1501
Patent
active
056481900
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method of forming a color image and an apparatus used therefor such as an electrophotographic color duplicator, a color printer, a color proofer or a color checker.
TECHNICAL BACKGROUND
Methods of forming color printings, color duplicates or color proofs (proofs for printing) which comprises conducting development with electrophotographic developing agents to form a plurality of over-lapping color toner images directly on the surface of electrophotographic light-sensitive element and transferring the resulting color images at once onto a receiving material such as printing paper have hitherto been known.
The developing methods include a so-called dry type developing method and wet type developing method. Color images obtained by the wet type developing method are preferred because of little color shear and good resolution as compared with those formed with dry toners. However, it is very difficult to directly transfer wet type toner images entirely from the surface of the light-sensitive element to printing paper.
In order to solve this problem, a transfer technique in which a non-aqueous solvent is supplied between a light-sensitive element and a receiving material and then transfer is electrostatically performed is described in JP-A-2-272469 (the term "JP-A" as used herein means an "unexamined published Japanese patent application").
Also, a method in which a transparent film is first laminated on the surface of a light-sensitive element, wet type toner images are formed by an electrophotographic process on the film, and then the film bearing the toner images is separated from the light-sensitive element and stuck on paper, thereby forming transferred images is described in JP-A-2-115865 and JP-A-2-115866. According to the method, the film to be laminated has suitably a thickness of 9 .mu.m. However, the production and handling of a film having such thickness is very troublesome and it is necessary to arrange a special system for them.
Further, in JP-B-2-43185 (the term "JP-B" as used herein means an "examined Japanese patent publication"), a method in which imagewise exposure through a transparent electrophotographic light-sensitive element and development are conducted repeatedly to form over-lapping color separation images on a dielectric support releasably provided on the light-sensitive element and the dielectric support bearing the images is transferred to a receiving material is described. Since the imagewise exposure is performed from the side of substrate for the light-sensitive element according to this method, the substrate is required to be transparent. This is disadvantageous in view of a cost.
On the other hand, an electrophotographic transfer method using a so-called dry type developing method in which a releasable transfer layer is provided on the surface of a light-sensitive element, toner images are formed on the transfer layer and the toner images are transferred together with the transfer layer to printing paper is described in JP-A-1-112264, JP-A-1-281464 and JP-A-3-11347.
Moreover, in EP-A-0534479, a method in which a transfer layer is formed on the surface of light-sensitive element which has releasability, one or more color toner images are formed on the transfer layer by an electrophotographic process and then the toner images are transferred together with the transfer layer onto a receiving material is described. However, a latitude of conditions on the transfer (for example, heating temperature, pressure and transportation speed) of toner images together with the transfer layer is still narrow and unsatisfactory in this method.
In order to obtain good color images by a color image-forming method in which toner images are transferred together with the transfer layer to printing paper various kinds of requirements must be satisfied.
First, it is important that the transfer layer should be uniformly provided in order to perform uniform charging and exposure to light and not degrade electrophotographic characteristics of an ele
REFERENCES:
patent: 3847642 (1974-11-01), Rhodes
patent: 3999481 (1976-12-01), Sankus
patent: 5176974 (1993-01-01), Till et al.
patent: 5370960 (1994-12-01), Cahill et al.
Kato Eiichi
Nakazawa Yusuke
Osawa Sadao
Fuji Photo Film Co. , Ltd.
Martin Roland
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