SU1339484A1 - Method of producing multicolour image on electrophotographic medium - Google Patents

Abstract

The invention relates to methods for producing a multi-color image on electrophotographic information carriers. The purpose of the invention is to improve the image quality by eliminating parasitic charge contrast in the open and closed areas of the carrier colored particles. On the carrier, after the final, for each color, charging, color separation exposure, and the development of the latent image are carried out. The potential of the subsequent charge exceeds the potential of the first charge. This makes it possible to compensate for the most rapid dark decrease in the potential in the areas covered by the colored particles. During exposure, uniform illumination of the carrier is carried out. In this case, the microfiche is moved over the line light source. 2 "(LS)

Description

The invention relates to electrophotography, in particular, to methods for producing a multi-color image on electrophotographic information carriers, and can be used to produce multi-color slides and microfilms.

The purpose of the invention is to improve the quality of the image by eliminating the parasitic charge contrast in the open and closed areas of the carrier colored particles.

Example. A negative-positive image is obtained on an electrophotographic carrier consisting of a substrate, a conducting and photosensitive layer made from a sanitized polyepoxypropylcarbazole. When recording a first color, the carrier is corona-charged to a potential of .300 B, and then exposed and develop an appropriate liquid propellant, which is a suspension of colored particles in a liquid carrier. The development is carried out when the information carrier is moved. Above is a development site that creates a developer meniscus with which the surface of the photosensitive layer contacts. When forming a second color image, the carrier is charged to a potential of 325–360 V in order to compensate for the most rapid dark decrease in potential in the areas covered with particles stained.

After exposure, the carrier is uniformly illuminated during the movement of the microfiche over the linear source of light. The intensity of the illumination is chosen so that the areas of the carrier with a layer of the prodReditor V. Petrash

Compiled by B.Aksenov Tehred M.Dvdyk

Order 4217/35 Circulation 420 Subscription

VNIIPI USSR State Committee for Inventions and Discoveries 4/5, Raushsk nab., Moscow, 113035

Production and printing company, Uzhgorod, st. Project, 4

bodies and without it acquired the same potential, which excludes the imposition of a second color developer on a previously

about vennoe.

If the illumination is insufficient to eliminate the parasitic charge contrast, the developer of the second and subsequent colors will lie directly on the edge of the previously developed image. In the case of greater than what is required to equalize the potential, the illumination deposition is performed next to the previously developed image, giving it a color edging.

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Claims (1)

Invention Formula A method of obtaining a multi-color image on an electrophotographic carrier, which consists in sequentially forming images of each color on it by means of electric charging of the carrier, color separation and the development of the latent image with corresponding colored particles, characterized in that, in order to improve image quality by eliminating parasitic charging fine contrast in the open and closed portions of the colored particles of the carrier; each subsequent charge is adjusted to the potential, n evsh ayuschego first charge potential by an amount equal to the capacity decline TeMHOBOKS carrier portions closed colored particles ,, wherein before a subsequent exposure npioBo- d t dosage illumination carrier for equalizing the potential on the open and closed portions of the carrier .. Proofreader N.Korol