RU1797089C - Method for developing charge image - Google Patents

Abstract

The invention relates to semiconductor integrated technology and is intended to provide a potential image. in photocopiers. The essence of the method lies in the fact that the formation of a potential relief on the surface of the recording material is carried out by the leakage of electric charges on the surface of the recording material. The recording material is a dielectric layer deposited on a rigid base with unipolar transistors uniformly distributed over its surface with a metal-insulator-semiconductor structure. 2 ill.

Description

The invention relates to semiconductor integrated technology and is intended to provide a potential image in photocopiers.

The greatest distribution in electrography during the formation of a latent electrostatic image was obtained by a method, including the creation of electron-hole pairs in a photosensitive electrophotographic (EFG) layer by absorbing optical radiation and separating them in an electric field.

A known method for capturing a potential image includes the following two steps: electrifying the photosensitive EFG layer and exposing the layer. In the first dose, static charges were applied to the photosensitive EFG layer using an electrizer. In the second method, the image of the original is projected onto the charged photosensitive EFG layer using an optical system. Photons reflected from the bright areas of the original surface are absorbed by the photosensitive EPG layer, creating electron-hole peers in it, which are separated in an electric field. The action of the light flux leads to the draining of static electricity charges from the illuminated portions of the photosensitive EFG layer, while the charge remains in unlit portions. Moreover, the amount of charge in the unlit portions of the photosensitive layer decreases over time. As a result, a potential image corresponding to the original image appears on the surface of the photosensitive EPG layer. Thus, in the known method, the discharge of static electricity charges from the illuminated areas of photoXI

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sensitive EFG layer, leading to the formation of a potential image of the original on the photosensitive EEG layer.

The disadvantages of the known method used in the copying technique are:

- large geometric dimensions of potential image acquisition devices in which optical systems occupy the bulk;

- the recording semiconductor material must necessarily have good photosensitivity;

- aging of the photosensitive layer during the copying process yields only about 50,000 copies;

- low print run;

- the difficulty of obtaining copies of various formats ;,

- when obtaining a potential image, light sources are used, the utilization rate of which is very low:

- use of a high voltage of 5-12 kV. .

Of the known technical solutions, the closest object to the claimed object and selected as a prototype at the same time as the basic object is a laser printing device (MPI). A printing method using healthcare facilities includes the following steps:

- preparing a digital or analog signal at the input of the medical facility carrying contrast-tone information about the image raster element; .

- conversion of code information into a modulated luminous flux of laser radiation projected onto the surface of the EF layer;

- the formation of a latent electrostatic image on the EPG layer under the action of laser radiation,

In the healthcare facility, the EFG process described in detail above is used to form a latent electrostatic image.

The disadvantages of this method are:

- the effect of corona discharge and

- the light exposure of the laser radiation to a change in the structure of the photosensitive layer, leading to a decrease in its photosensitivity with time;

- limited print run;

- low mechanical strength of the EFG layer.;.

- use of laser technology;

- use of high voltage.

The aim of the method is to improve image quality by increasing the resolution of the recording material and increasing its printability.

In FIG. 1. is a schematic diagram of one line of the device; in FIG. 2 diagram of the potential relief of the image

The essence of the method lies in the fact that the formation of a potential relief is carried out by the leakage of electric charges on the surface of the recording material. The electronic image of the original (text, figure) contained in the computer memory is transmitted via the communication interface to the surface of the recording material, which is a dielectric layer deposited on a rigid base with unipolar transistors uniformly distributed over its surface with a metal-metal structure semiconductor dielectric.

An example of the method. At present, in the computer memory, the electronic image of the original is displayed line by line on the surface of the recording material of the carrier matrix, which is a dielectric layer deposited on a hard layer. a base with unipolar transistors evenly distributed over its surfaces. The number of such transistors per surface unit satisfies the resolution of the copying process. Existing technologies make it possible to obtain the sixth degree of integration of elements over an area of 1 mm2. While for the proposed material, the first degree of integration is sufficient. it

0 due to the fact that about 10 cells fit into 1 mm, since it is this number that determines the resolution of electrographic devices (5-10 strokes per millimeter) associated with the dimensions

5 toner particles (200-300 microns), without which image transfer onto paper is not without. The device for obtaining a potential image includes an address bus 1, a demultiplexer 2, transistors 3, a protective layer 4, and the voltage supplied from the power supply + U. A potential elevation diagram of the image of the raster line is indicated by 5.

The device operates as follows, Before filling in the line, the potential source of all transistors is zero. From the computer memory via the address bus 1 to the input of the demultiplexer 2 are sequentially supplied codes of image raster elements that open the corresponding transistors 3. As a result, the sources of open transistors are charged to potential + U. The sources of closed transistors remain at zero potential. Thus, potentials are formed on the surface of the carrier matrix, the relief shown in Fig. 2.

The magnitude of the potential to be applied to the cells of the carrier matrix lies in the range of capabilities of modern MIS structures from which field effect transistors are made. Field technology has long been used in technology.

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transistors capable of operating at voltages up to 450 V. The capacitance of the source output of a cell is on the order of 15 pF. With the resistance of the open Stoke-Source transition equal to 50 Ohms and the closed Stoke-Source-order transition of about 1012 Ohms, the charge and discharge time constants of the cell will be respectively s and 10 s. It follows that when the image is transferred to the carrier matrix, it will be stored on it for 10 s, i.e., enough time to repeatedly update the information on it using a computer.

Claims (1)

The claims A method of obtaining a potential image, which consists in forming a potential relief from electric charges on the recording material, and so on, so that, in order to improve image quality by increasing. resolution of the recording material and its increase 4 As a recording material, a dielectric layer deposited on a rigid base with unipolar transistors with a metal-dielectric-semiconductor structure uniformly distributed over its surface is used as a recording material, while the formation of a potential relief is carried out by the leakage of electric charges on the surface of the recording material. $ Ig. I. XL Jdl -Oh. figure 2