SU1164645A1 - Method of producing electrophotographic image on dielectric film - Google Patents

Description

The invention relates to a reproduction technique by electrophotographic methods and can be used to obtain line images, mainly on films. five

The aim of the invention is to improve the quality of the image.

FIG. 1 - 6 schematically shows the implementation of the proposed method. ten

FIG. 1 shows an electrophotographic layer 1 deposited on a metal substrate 2 and carrying a positive charge 3.

FIG. 75 shows the same layer 1, 15

carrying a hidden negative electrostatic image 3 as a result of exposure of the original-negative 4.

FIG. 3 shows the operation of obtaining on film 5, in contact with layer 1, a latent positive electrostatic image 6 by deposition of positive and negative ions from the source 7 25

in the presence of bias potential.

FIG. 4 shows the operation of developing a latent electrostatic image 3 on a film with 5 particles of liquid electrophotographic developer 8 supplied from a developing device 9.

FIG. 5 shows the operation of the drying of the developed transparency 10 with thermoelement 11. 35

FIG. 6 shows the finished film 12 on the film 5.

Example 1, Make a bar slide projection on the ₄₀ selenium layer of the negative using a photographic enlarger. A selenium plate with a layer thickness of 50–80 μm is charged in a corona discharge to a potential of + 100 V, and then exposed to 0.7 s at

illumination of 20 lux. The exposed plate is then placed on a metal vacuum table, where a sheet of a dacron film 25-30 microns thick is pressed against the selenium layer.

Next, the plate with the film is placed for 1-2 s under the static electricity converter of the radioisotope type ISE — 200. At the same time between the working side of the neutralizer and the substrate of the selenium layer serves a constant potential difference of 75 V, moreover, plus a voltage source connected to the working side of the neutralizer, and minus - with the substrate layer. Then a film with a hidden positive image is separated from the selenium layer. To visualize the latent image, the film is washed off with a liquid electrophotographic developer, having negatively charged particles, for 1-2 s. To fix the developed image, the film is blown with a stream of air heated to 70 ° C for 30 s.

The result is a film with an optical density of the image of 2.5 - 3.0. veils - 0.1. ·

Example p 2. -Diaplate positive as in Example 1, but the image is generated by the magnetic brush method. After thermal fixation of the powder image get a transparency with an optical density of 1.2-1.4 voices - 0.2.

Example A stroke (textual) slide is obtained in the same way as in Example 1, but using an SS-7 flash lamp as a light source. As a result of exposure of the selenium layer within 0.005 s and. for further operations, a text slide is obtained with an optical image density of 2.5–2.7, and a veil of –0.1.

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Claims (1)

A METHOD FOR OBTAINING AN ELECTROPHOTOGRAPHIC IMAGE ON A DIELECTRIC FILM by casting in contact with the surface of a charged and exposed electrophotographic layer, supply of positive and negative ions to the film, separation of the film from the electrophotographic layer and subsequent manifestation and fixation of the image on the film, characterized in that, in order to improve the image quality, positive and negative ions are fed at displacement potential equal in sign to the potential of the electrophotolayer. 3 1 + + + + + + U -1-4-4-1-4-4-4-4-4- + H - / + FIG! $ and „„ 1164645 1 1164645 2