JPS58162975A - Electrophotographic receptor - Google Patents

Abstract

PURPOSE:To prevent the multiplex reflection of incident light and to enhance adhesive strength by using a support having 500- 10,000Angstrom surface roughness and a light scattering effect. CONSTITUTION:The surface roughness of the metallic drum 1 of an electrophotographic receptor is regulated to 500- 10,000Angstrom , preferably 800- 5,000Angstrom . In case of < 500Angstrom , the drum has inferior adhesive strength. In case of > 10,000Angstrom , the drum has a satisfactory effect of preventing the multiplex reflection of light but has inferior adhesive strength and causes deterioration of image quality. The surface of the metallic drum 1 is worked by any method as far as the roughness is within the proper value. The numerical value of the surface roughness is the distance from a center line 3 shown in the figure to each protrusion and each recess. In the figure, 2 is a photoconductive layer.

Description

[Detailed description of the invention] The present invention relates to an electrophotographic photoreceptor.

In particular, the present invention relates to an electrophotographic photoreceptor suitable for an electrophotographic process in which an image is recorded by performing optical scanning on the photoreceptor using ms exposure of semiconductor radar light in accordance with digital image information.

Conventionally, metal drums have been commonly used as drums for electrophotographic photoreceptors due to their workability and mechanical strength.
Among them, the cylinder is the most commonly used melam material due to its cost, and when a metal drum is used, its surface shape is improved by using photoconductive layer cages, marks, etc. For example, in order to obtain the surface of a photosensitive layer with as little unevenness as possible, it is necessary to process the surface to a mirror surface with a small difference in unevenness, and when using a photoconductive material with high internal stress among materials with poor adhesion, when cutting a metal drum. Alternatively, some degree of unevenness is created after cutting to improve adhesion.

However, there is no clear indication value for the surface condition of the metal drum, and it has been found that in certain electrophotographic processes, the surface condition of the metal drum is an important factor in image quality.

In other words, in the electrophotographic process KTo, which uses semiconductor radar light for image exposure and optically scans the surface of a photoreceptor, if the light absorption coefficient of the photoconductive layer is small, the light reaches the metal drum surface and causes damage to the metal surface. It will be reflected again, causing a multiple reflection phenomenon. This multiple reflection of light apparently increases the incident light aperture of the semiconductor radar, resulting in a good condition, and the quality of the image obtained is significantly degraded.

An object of the present invention is to provide an electrophotographic photoreceptor that can prevent multiple reflections of incident light and has strong adhesion.

The electron 4 true photoreceptor of the present invention has a surface roughness KTo of the bare surface of a metal drum in the range of ±500x to ±100001, preferably ±8001 to ±±.
The range is 50001. Surface roughness is ±500
If it is less than X, the adhesion will not be good and the effect of preventing multiple reflections of light will be small. If it is more than ±100001, the effect of preventing multiple reflections of light will be obtained, but the adhesion will be poor, and The influence of unevenness appears on the surface Km of the photosensitive layer, which is undesirable because it causes a deterioration in image quality.

The surface of the metal drum according to the present invention can be processed by any method as long as the roughness is within an appropriate value, and a precision cutting method such as diamond cutting is generally suitable.

Next, the present invention will be explained in detail with reference to Examples and Comparative Examples.

One side finished 9 At drum, unevenness ±1000X
A photoconductive film of amorphous silicon is formed on three types of At drums by a dazzling discharge method and used as photoreceptors. The 9mm L drum has a mirror finish, and there is some peeling of the G on the edge of the I ram, and the unevenness is ±l100OX.
Larger peeling was observed on the K-processed drum.

We compared this photoreceptor with a Rede beam printer that uses 780-meter semiconductor Rede light for image exposure, and tested the durability of the drum. On the other hand, the image quality of the Mut" drum with unevenness ± 100 OIK processing was good and the image quality was good. In addition, in the durability test, the mirror finish At drum and the unevenness ± 100 OIK processing drum showed a decrease in the number of durability tests. Peeling of the photoconductive layer progresses,
In a trench that cannot be used for practical purposes, K is 9. On one side, unevenness is ±1.
The At drum processed to 000X did not peel off at all even after being used 1 million times.

From the above examples and the results of numerous experiments, it has been found that there is an optimal value for the roughness of the surface of the metal drum.
In order to prevent multiple reflections of incident light by scattering the light, the surface roughness must be ±500X or more, and
To obtain a photoreceptor with strong adhesion, the roughness of the surface should be ±5.
It is certain that the condition of 001 or more and ±10000X or less is necessary.

The value of the roughness of the surface of the ceramic according to the present invention is the distance between the convex portion and the concave portion O from the center 11I3 shown in the drawing. In the figure, 1 indicates the metal drum and 2 indicates the photoconductive layer.

[Brief explanation of drawings]

The drawing is an explanatory diagram of an example photoconductor of the present invention. 1: Metal drum, 2: Photoconductive layer, 3: Center of unevenness.

Claims (1)

[Claims] In an electrophotographic photoreceptor having a support and a single leading layer, the surface roughness of the support is from ±5001 to ±1000.
An electrophotographic photoreceptor characterized by having a layer having a light scattering effect in the 0XO range.