DE2937098A1 - High quality photosensitive plate for photocopier - has coated conducting sub-layer to eliminate surface spots - Google Patents

Abstract

A high quality photosensitive plate for a photocopier has a smooth layer (2) applied to a prepared base, with the photosensitive emulsion (3) coated over the top. The coated layer has a min. of defects and is superior to a polished finish. The intermediate layer is conductive on a non-conducting base. It can be vacuum coated aluminium or similar material. It provides a high quality, low cost base preparation for the photosensitive emulsion.

Description

Imaging surface for electrophotographic or

xeroradiographic transfer printing and process for making same.

The invention relates to an imaging surface for the electrophotographic or xeroradiographic transfer printing, consisting of one applied to a carrier photoconductive layer. The invention also relates to a manufacturing method for such an imaging surface.

Illumination areas of the type mentioned at the beginning are known (DE-OS 26 54 096). These can be plates, binders or frox eln. For one Perfect transfer printing, it is native that the photoconductive layer is smooth and has a flawless surface. The surface roughness should be less than 0.5 µm.

In the commonly used coating process by vacuum vapor deposition Defects arise from geometric and chemical inhomogeneities on the carrier on the surface of the photoconductive layer (e.g. 3rd surveys or Wells). These errors lead to visible printing errors. So far it has been tried the surface defects by thorough cleaning and chemical or electrochemical Removal of a thin surface layer of the carrier. About a caustic attack and thus a roughening of the carrier during the chemical or electrochemical To prevent the cleaning process, high-purity material, e.g.

Pure aluminum, used as a carrier substance. The handling and the disposal of the cleaning or etching baths caused considerable additional costs Costs for the production of the imaging surfaces.

Furthermore, a method is already known (DE-OS 26 54 096) to subsequently polishing the finished coating smooth by mechanical rubbing. With this method, however, there is the risk that existing bumps during polishing break out, creating a hole in the coating.

The present invention is based on the object of an imaging surface of the type mentioned at the beginning with greatly reduced surface defects and a simple one and to specify cost-effective manufacturing processes therefor. This object is achieved according to the invention solved in that between the photoconductive layer and the carrier a conductive vapor deposition.

This intermediate layer gives you a very clean surface of one cm for further vapor deposition of the photoconductive layer. The intermediate layer is the same also geametric bumps to a certain extent and takes care of their high degree of chemical purity for uniform germination of the following Layer.

Aluminum can advantageously be used for the intermediate layer will. This eliminates the need to use metal substrates as a blank for the carrier to use. At least less pure and therefore cheaper carrier material can be used (e.g. low-purity aluminum or steel) can be used. Through the conductive vapor deposition, it is even possible to use plastic for the carrier.

In an advantageous method for producing the inventive. The image surface is the conductive vapor deposition layer immediately before the photoconductor coating upset. To make the additional effort for this conductive vapor deposition layer so low As far as possible, it is also intended that both layers should have the same principles be evaporated without intermediate ventilation. The intermediate layer thereby forms a Ultra-clean surface for further steaming, which is caused by further post-handling could no longer be improved. The conductive intermediate layers can, for example can be generated by electron beam evaporation or also by crucible evaporation. For the photoconductive layer, e.g. selenium, selenium with low levels of arsenic, Arsenic compounds and the like in question.

In the following, an embodiment of the invention is based on a figure Imaging surface and the corresponding manufacturing process described in more detail and explained.

An aluminum plate (AlMn) 1 serves as the carrier. At a pressure of 1.1 6 mbar is an aluminum intermediate layer 2 of about 0.1 / um by evaporation of pure aluminum with an electron beam gun. brings. In order to ensure good adhesion of this aluminum intermediate layer 2 to the carrier 1, the carrier is heated to approx. 170 ° C. Immediately after applying the aluminum intermediate layer 2 becomes an approx. 20 μm thick photoconductive layer (As2Se3) (3) by means of crucible evaporation manufactured.

First attempts could be made by light microscopic examinations a reduction in surface defects by a factor> 2 compared to the case can be established without a conductive vapor deposition layer.

1 Figure 5 claims Blank page

Claims (5)

Patent claims: imaging surface for electrophotographic or xeroradiographic transfer printing, consisting of one applied to a carrier photoconductive layer, characterized in that it is located between the photoconductive layer (3) and the carrier (1) is a conductive vapor deposition layer (2). 2. Imaging surface according to claim 1, characterized in that g e -k e n n z e i c h n e t that the vapor deposition layer (2) consists of aluminum. 3. Imaging surface according to claim 1 or 2, characterized in that g e k e n n z e i c h n e t that plastic is provided as carrier (i). 4. A method for producing an imaging surface according to one of the Claims 1 to 3, in which the photoconductive layer is applied to the support in a recipient is vapor-deposited, thereby noting that immediately before the photoconductor coating the conductive vapor deposition layer (2) is applied. 5. A method for producing an imaging surface according to claim 4, in that both layers (2, 3) are in the same recipient be absorbed without intermediate ventilation.