SU1234800A1 - Method of recording and printing powder images - Google Patents

Abstract

The invention relates to a method of recording and replicating images in the field of electrophotography and will allow improving the quality of replication. The toner image is mounted on an electrophotographic printed form. The image is replicated by repeated repetition of the form charging, illumination of it, the appearance of the latent electrostatic image and the transfer of the developed image to the terminal carrier. The photocarrier (FN) of the dielectric-photoconductor-dielectric structure is used as an electrofautographic printing plate. The primary toner image is formed on one of the sides of the FN. Replication is carried out on the other side of the FN, the illumination of which is carried out from the side of the primary toner image. An FN consisting of a 80 µm thick selenium amorphous layer, enclosed on both sides with 2 µm thick polyethylene terephthalate films, serves as a print media. 5 nl. (L

Description

The invention relates to electrophotography and can be used in electrophotographic rotaprints and in electrophotographic devices for recording a synthesized optical image.

The purpose of the invention is to duplicate the quality of replication.

FIG. Figure 1 shows the distribution of charges in the structure of the photocarrier (p. 1, red) by exposure; in fig. 2 is the same after recording the hidden electrostatic image; in fig. 3 - the same, before the manifestation; in fig. 4- primary primary toner image on one side of the photocarrier and copy image of the replicated image after the latent electrostatic image is developed; in fig. 5 - the remainder and transferred to the terminal media developed image. .

PRI me R. A photocarrier consisting of a 80 µm thick selenium amorphous layer 1 enclosed between 20 µm thick polyethylene terephthalate films 2 and 3 is used as a print forum.

At first, Light is charged with a printed form in the corona discharge up to a voltage of 1.5 kV. In the light, selenium layer 1 does not hold charges; therefore, the dielectric layer 2 is positively charged, and the dielectric layer 3 is negative and the entire voltage is applied to them. Then the form in the same charge device is recharged with charge of opposite polarity so that the total voltage drop on the form is close to zero and an image is displayed on it. The exposed photocarrier is then again additionally discharged to zero potential, and an electrostatic image is formed. Before the formation of the latent electrostatic image formed, the shape is uniformly illuminated to reveal the electrostatic contrast potential. The concealed electrostatic image appears in a positive-inverse scheme, after which a toner image is formed on the side of film 2, which is not specifically fixed, because

adhesion is enough to keep it on the side of the dielectric film 2 during the entire process of replication, but not enough to prevent the eraser from erasing with a soft roller before forming a subsequent circulation image on the same photo carrier.

In the process of replication, first, as described above, the foral is uniformly charged in the light (Fig. 1), then recharged, combined with the exposure of the form, carried out by illumination from the primary toner image.

The charging voltage for the indicated photocarrier is approximately 3 kV, and it is advisable to select the same recharging level as close to zero. After recharging, the charges are distributed as indicated in FIG. 2, and FIG. 3 shows the distribution of the charges after uniform illumination of the manifestation necessary for the realization. A hidden electrostatic image of positive polarity, formed on dielectric layer 3, exhibits SchSch-43, in which the toner particles are negatively charged. An electrophotographic printed form with developed replicated image 4 and a positive copy of this image 5 on the other side is shown in FIG. 4. Next, the toner image of copy 5 is brought into contact with an image sheet of paper 6 that receives the image (Fig. 5) and this image is transferred to paper with the help of a conducting cut-off roller 7. The transferred image is thermally fixed.

All replication operations are carried out on a moving (5 cm / s) electrophotographic printed form, which ensures a continuous replication process at a speed of 15 copies / scientific research institute.

(Formula of the invention

The method of recording and grinding powder images, including the formation of the primary toner image on the electrophotographic image and the subsequent replication of the image by repeated-bit-charging operations on its illumination, the appearance of the latent electrostatic image and the transfer of the developed image to the terminal carrier and in order to improve the quality of replication, a photo-carrier of the dielectric structure is used as an exemplary photographic print media. - fotonrovodnik - dielectric primary toner .- Images llllltl

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The radiation is formed on one side of the photocarrier, after which the photocarrier on the other side is replicated, and the photocarrier is illuminated from the side of the primary toner image.

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Editor L. Veselovska

Compiled by V. Aksenov

Tehred V. Kada ($ Proofreader L. Pilipenko

Order 2982 / А9Тираж 436Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

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

Claims (1)

Claim A method of recording and duplication of powder images, including the formation on an electrophotographic printing form of a primary toner image and subsequent replication of the image by repeatedly repeating the operations of charging the form, highlighting it, revealing a latent electrostatic image, and transferring the developed image to an end medium, and with the fact that, in order to improve the quality of replication, as an electrophotographic. printing forf! they use a photo-carrier of a dielectric structure — a photo-conductor dielectric, the primary toner image is formed on one side of the photo-carrier, after which replication is performed on the other side of the photo-carrier, and photo5 of the carrier is illuminated from the side of the primary toner image. I I, I Fi * .1 fi * .2 4 Phi *. 3 Phi *. 4 FIG. 5