Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Patent
1994-11-25
1998-05-05
Codd, Bernard P.
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
430 47, 430132, 156277, 399159, 399298, 204492, 204499, G03G 1314, G03G 1301, G03G 1516
Patent
active
057472149
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/JP94/00487 filed Mar. 25, 1994.
TECHNICAL FIELD
The present invention relates to a method of forming an electrophotographic color transfer image and an apparatus used therefor, and more particularly to a method of forming an electrophotographic color transfer image which forms color images free from color shear, by which toner images are completely transferred onto a receiving material without being accompanied by degradation of image quality upon the transfer and which provides color duplicates having good storage stability, and an apparatus used therefor.
TECHNICAL BACKGROUND
Methods of forming color printings, color duplicates or color proofs (proofs for printing) which comprises providing a plurality of overlapping color toner images directly on the surface of electrophotographic light-sensitive element using an electrophotographic development process and transferring at once the resulting color images onto a receiving material such as printing paper are 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 a receiving material such as 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 a 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 image-wise exposure is performed from the side of the substrate for the light-sensitive element according to this method, the substrate is required to be transparent. This is disadvantageous in view of 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.
However, 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 a printing paper various kinds of requirements must be satisfied.
First, it is important that the transfer layer be uniform in order to perform uniform charging and exposure to light and not degrade electrophotographic characteristics of an electrophotographic light-sensitive element since toner images are formed upon an electrophotographic process. Also, the transfer layer is desired to have good releasability from an electrophotog
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English Translation of JP 48-33183 Makino et al., Oct. 12, 1973.
Kato Eiichi
Nakazawa Yusuke
Osawa Sadao
Codd Bernard P.
Fuji Photo Film Co. , Ltd.
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