DE1295374C2 - PROCESS FOR CREATING A CHARGE IMAGE ON AN INSULATING LAYER THAT CANNOT BE DELETED BY THE EFFECT OF LIGHT - Google Patents

Description

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> The invention relates to a method for applying curler powder. This developer production of a powder that is not powdered solely by the action of light can be fixed on the IsoJatorschicht. A detectable charge image on an insulator sheet. In connection with the awareness of a

Processes of the above-mentioned type are known in the case of electroretts containing a photoconductive layer One side of an insulator layer is pushed into the bioconductive layer in front of the exterior lighting Influence area of the electric field of a corona charge. The photo charge is brought to the other side of the conductive layer, initially exposed uniformly Insulator layer is a uniform electrical consequence of the fact that the pbotolett-colored Schietielek charge is applied. As a result, the insulator layer becomes triscbly conductive and any electrostatic charge located on one of its upper layers in the configuration of the above-mentioned charge surface takes up a charge as a counter-image. So that is then on this overlapping page, then is derived Insulator layer is unaffected by the action of light, the photoconductive layer by corona charging A charge image that remains flowing is produced and charged with the opposite polarity. Est after

Further, a method of transferring a 15 charge is done when the image is exposed. In addition to the known VerFolie considered above, transfer the charge image from the insulating front side of a second to the insulating front side of a second photoconductive recording sheet. In this known method, advertising materials for the electrophotography print mean that the two surfaces of the foils are in contact or know, with the aid of which charge images are brought into close proximity to one another. In addition to the exposure to activating radiation, an electrical preceding electrostatic charge generating field is applied between the foils, one of which is relieved of the charge distribution. These recording materials contain a speaking charge transfer between the two, an insulating effect that causes the loss of charge in the dark. interfering layer between the conductive

In connection with a method of the support and the photoconductive layer as well The latter type is also already known to have a very thin image recording surface, which is evenly insulating with the selected folarity, very close to a faiis insulating outer layer, which is the photoconductive photoconductive layer Bring shift. It is covered in a capable layer.

of the photoconductive layer by image-wise loading, but it is also already a recording material

primarily a conductivity pattern is formed. A 30 known to generate a charge image in which

The charge image corresponding to the conductivity image is covered by a protective insulator coating

a photoconductive layer is then applied directly to the insulating surface of the skin

produced in that is supported by <\ nlaying a conductive carrier layer.

Potential to the photoconductive layer is known to be conductive to all of the above

are process and arrangements appropriately distributed in an image-wise manner, insofar as they are the

electric field between the two surfaces creates an unaffected by exposure to light

is procreated. permanent charge pattern flows on an insulator

In addition to the previously-considered known VCR layer relate to each taken measures to take is already a method for producing the electrophotographic on a Aufzeichvon charge images by the photoconductive Materi- * ₀ clot material produced in each case charge image on known. In this known method, a separate insulating layer is to be transferred. The one light image through a transparent layer of just mentioned insulator layer is to be brought up to the electrically conductive material and through a transparent photoconductive layer lying on it from the rial. This type of production, however, a high resistance to an unaffected remaining by the action of light located with this in contact ^ _5, but separable layer of electrically charge image on an insulator layer is an insulating material, which adversely by a supporting in the sense that deposited as difficulties metal layer kt . thrown. Here, a relation to the trans- insulator layer with the respective electrophotographic ent, electrically conductive layer ₅₀ entgegen- photographic recording material to occur in view of the proper contacting of the metal supporting layer. Presented potential applied, whereupon on the upper over is disadvantageous that separate front surface of the insulating material after its separation directions for bringing the insulator from the photoconductive layer into contact with a charge image layer with the respective electrophotographic carries, a dispersion of carbon powder z. B. are required in a recording material,
not suffering cylinder is applied and the image _5S The invention now has the object to show moderate coking optionally on a one way, such as a light exposure surface other by being transmitted to change. non-erasable charge image on an insulator layer

There is also already a method for electrophoto- can be produced in a relatively simple manner,

graphic reproduction of images known without the previously known method for

to which one side of an insulator layer adheres electrostatically to produce such charge images

is charged, while the other side disadvantages have to be accepted. Solved

this insulating layer with a photoconductive one is used in a method of the opening paragraph

Layer is brought into contact. According to the invention by a named type in that in

Exposure corresponding to a photograph of the electrophotographic known per se

photoconductive layer is applied to the first-mentioned 65 recording material, consisting of a conductive

Side of the insulator layer generates a charge image. the substrate and a photoconductive layer,

On the just mentioned side of the insulator layer which is covered with an insulator layer in which the

may now an electrostatically attractable decision insulator layer adjacent boundary layer of the photo-

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conductive layer in a known manner a charge image is generated and that after the generation of this Charge pattern the isolator layer of an alternating current or DC orakarona charging.

This measure has the advantage that only the electrophotographic recording material which is already present is used to produce a charge image which remains unaffected by the action of light. Thereby, advantageously the ^ ₀ procedure the abovementioned known for the production of unaffected residual by exposure to light charge images on an insulator layer adhered disadvantages, such as the difficulties of Inkontaktbringes such insulator layers with the respective electrophotographic recording materials, is avoided.

The invention is explained in more detail below with reference to drawings.

Fig. 1 and 2 illustrate the known method of forming a charge image in a elekiro- _ao photographic material;

F i g. 3 and 4 illustrate the invention Process steps for producing a charge image that remains unaffected by the action of light on an insulator layer of the electrophotographic recording material.

Before the method according to the invention is explained in more detail with reference to the drawings, the details shown in the drawings should first be considered in more detail. The electrophotographic recording material used is a layer structure 31 which, in a known manner, consists of a photoconductive layer U, an insulator layer 14 located above it and a conductive layer carrier 13 located below it. The conductive layer carrier 13 and / or _3S the insulator layer 14 can be transparent.

In the drawings, a corona charger 30 is further shown, a positive charge listed _4C can be introduced with the aid of which the insulator layer of the electrophotographic recording material 31st Furthermore, a light source 32 is provided, the emitted light of which is used to expose the electrophotographic recording material 31. Between this light source 32 and the electrophotographic recording material 31, as shown in FIG. 2 illustrates a translucent image 33 may be arranged.

As mentioned earlier, FIG. 1 and 2 the known type of generation of a charge image corresponding to the image 33 in the boundary layer of the photoconductive layer 11 of the electrophotographic recording material 31 adjacent _{to the 5P of the insulator layer 14} positive charge applied. The knee charging device 30 performs a relative movement to the photographic recording material 3Ϊ, as indicated by the arrows shown in FIG. 1. After the electrophotographic recording material 31 has been charged, an image-wise exposure is carried out. The consequence of this imagewise exposure is that in those areas of the photoconductive layer 11 on which light has struck, a charge equalization takes place in the boundary layer of the photoconductive layer II adjacent to the insulator layer 14. This is indicated in FIG. 2 by minus signs at the relevant locations on the photoconductive layer H.

From the boundary layer of the photoconductive layer 11 adjacent to the insulator layer 14 The charge image generated on the electrophotographic recording material 31 now becomes a corresponding one The charge pattern on the insulator layer 14 is produced in that, according to FIG. 3 that through the Charge image image-wise differentiated surface potential of the insulator layer 14 is compensated. For this purpose, a positive charge is applied to the insulator layer 14. The charge will as in Fig. 3 illustrates only those areas recorded, dereu charge carriers by charge carriers of opposite polarity on the photoconductive layer 11 are bonded. This charge image can only be used by '/. < Exposure cannot be erased.

F i g. 4 illustrates total exposure of the photoconductive layer 11 with the aid of the light source 32. As a result of this total exposure, the imagewise exposure of the electrophotographic Recording material 31 unbound charge carriers on the insulator layer 14 in the boundary area bonded between this insulator layer 14 and the photo-conductive layer 11. The consequence of this is that the insulator layer 14 now has a positive charge carrier corresponding to the image 33 carries formed charge image, which remains unaffected by the action of light.

Finally, it should be noted that, in deviation from those shown and explained above Ratios according to which the charge on the insulator layer 14 by a DC corona discharge was applied, the charge on the insulator layer 14 was also applied by an alternating current corona discharge can be applied.

Claims (2)

Patent claims: 1. Process for the production of a charge image that cannot be erased solely by the action of light on an insulator layer, thereby ge e i c h η c t that in a known electrophotographic Recording material (31). consisting of a conductive layer support (13) and a photoconductive layer (11). with an Isolalorschicht (14) is coated in which the Isolato'schicht (14) adjacent boundary layer of the photoconductive layer (11) in a known Way in which the charge image is generated, and that Hugh of the generation of this charge image is the insulator layer (14) is subjected to AC or DC corona charging. 2. The method according to claim 1, characterized in that according to the alternating current or DC corona charging the photoconductive layer (11) is totally exposed. 1 sheet of drawings