JPH06138683A - Production of electrophotographic sensitive body - Google Patents

Abstract

PURPOSE:To improve the adhesiveness and to obtain a good picture characteristic having no striped pattern by forming a supporting body surface to a specific rough surface in a photosensitive body provided with a photoconductive layer on a supporting body directly or via an intermediate layer. CONSTITUTION:Ruggednesses 1a, 1b of almost serration groove shape forming the rough surface of the cylindrical supporting body 1 made of aluminium are respectively formed by a grinding wheel machining white keeping a regularity of being almost parallel in a radial direction of the cylindrical supporting body 1. A mountain height, that is a distance between 1a and 1b, is set. 0.3 to 2mum and a mutual distance between mountains, that is a distance between 1a and 1a', is set below 20mum. In the surface roughening, a parameter changing the mountain height is determined by particle sizes and pressure of the grinding wheel and the distance between mountains is determined by a sending speed of the grinding wheel. In such a manner, the adhesiveness of the photoconductive (photosensitive) layer is improved, the generation of interference fringes is also reduced and good pictures are obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a photoconductor for electrophotography, which improves adhesion between a photosensitive layer and a support,
The purpose is to reduce or prevent the occurrence of interference fringes in an image in electrophotography.

[0002]

2. Description of the Related Art Generally, in an amorphous photoconductor, aluminum or aluminum alloy is used as a support, and selenium or selenium as a main component is formed on the aluminum or aluminum alloy.
The e, S, and As alloys are made amorphous by vacuum vapor deposition to a thickness of about 60 μm.

In this vapor deposition, since glass is laminated on metal, the adhesiveness between them is poor and the adhesiveness is enhanced by various means. One of them is to roughen the surface of the support.For example, abrasive grains are used in both sand plast method and liquid honing method, the former is dispersed in air and the latter is dispersed in water. It is sprayed on a substrate to make irregularities on its surface and roughen it. The height shape of the unevenness can be changed by changing the size, shape, and type of the abrasive grains and the air pressure or water pressure.
It can be processed to a height of 5 to 20μ. Generally, if the thickness is 5 μm or more, the adhesion between the photosensitive layer and the supporting substrate is not good. On the other hand, at the height of this ridge, unevenness appears on the surface of the deposited selenium, and toner adheres to the surface, which is inconvenient for the image. Another method is to provide an intermediate layer between the substrate and the photosensitive layer. That is, this is a method in which the surface of the support is processed by an ultra-precision lathe called so-called mirror finishing, and a mirror surface having an unevenness of 0.1 μm or less is covered with a resin layer as an intermediate layer between the finishing photoconductive layer. Typical resin layers are, for example, vinyl chloride, polyethylene, polystyrene, and polycarbonate.

This intermediate layer is a method in which a resin is dissolved in an organic solvent to prepare a solution, and the support is dipped and coated. According to this method, a photoreceptor with good adhesion can be obtained,
On the other hand, since the base is a mirror surface, particularly in a recording apparatus using a monochromatic light as a light source, there is a drawback that interference occurs due to reflection from the support mirror surface and a stripe pattern is recorded on an image.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems and provides a method for producing an electrophotographic photosensitive member which enhances adhesion and obtains good image characteristics without stripes.

[0006]

The present invention relates to an electrophotographic photoreceptor in which a photoconductive layer is provided on a support having a roughened surface directly or through an intermediate layer, the roughened surface being processed by a grindstone. It has almost flat groove-like irregularities and 0.3 μm to 2
The method for producing an electrophotographic photosensitive member is characterized in that the photoconductor for electrophotography is formed in a concavo-convex shape in which the height of the peaks of μm and the mutual distance between the peaks are 20 μm or less.

Description will be made with reference to the following drawings. Figure 1a,
b and c are perspective views of a support according to an embodiment of the present invention, and FIG.
In the cross-sectional view and enlarged view of the main part of FIG. A-A ', 1 is a cylindrical support made of aluminum, and 1a and 1b are substantially flat groove-shaped irregularities forming the rough surface of the support 1, respectively It is formed with a regularity substantially parallel to one direction, that is, the radial direction. The height of the mountain, that is, the distance between 1a and 1b is 0.
3 μm to 2 μm, mutual distance between mountains 1a, 1a ′
Interval) is set to 20 μm or less.

FIG. 2 is a sectional view showing the structure of another embodiment of the present invention, in which 2 is an intermediate layer made of an organic resin and 3 is a photoconductive layer (photosensitive layer).

Table 1 compares the relationship between the adhesiveness, interference fringes, and vapor deposition appearance of the conventional device and the device of the embodiment of the present invention when the thickness of the photosensitive layer 3 is substantially constant.

[0010]

[Table 1]

In the above table, samples (A) to (D) are conventional examples, and (E) and (F) are examples devices. Samples A and B have a peak height of 0.5 μm by the liquid honing method. . If the resin layer is not present (B), the adhesiveness is poor, and if the resin layer is present, (A) the abrasive grains are attached to cause blistering in the vapor deposition appearance. Samples C and D are mirror-finished and the peak height is 0.
When the thickness is 1 μm or less and the resin layer is present (C), the adhesion is good, but interference fringes occur. (D) without resin layer is
Poor adhesion.

On the other hand, in Examples (E) and (F) of the present invention, the height of the ridges and grooves is 0.3 μm, and the mutual distance between the ridges is 20 μm.
m or less. The sample (F) having no resin (intermediate layer) has relatively good low-temperature deposition of Se-Te and Se-S in which the photosensitive layer 3 is vapor-deposited at a high temperature.
Not enough for the system. However, those coated with a resin layer had good (E) adhesiveness, no interference or fringes appeared, and the surface after vapor deposition was also good. The parameters that change the height in surface finishing (roughening) are determined by the grindstone, the grain size, and the pressing pressure. The distance between the peaks is determined by the feed speed of the grindstone. That is, when the feed is fast, the distance is long, and when the feed is slow, the distance is short. By the way, the higher the height of the mountain, the better the adhesion. Also, the occurrence of interference fringes is reduced because diffuse reflection increases, but when the thickness is 2.0 μm or more, unevenness appears on the surface of the evaporated selenium and toner adheres to the image, which is inconvenient. Also, if the distance (pitch) between peaks is short, dense peaks are formed and the adhesiveness is improved. If it is too short (about 0.1 μm), it causes interference fringes as described above and, at the same time, the regularity of concave and convex grooves. (Alignment) is poor, and the thickness of the intermediate layer is not uniform when the intermediate layer is used.

Therefore, considering the processing performance, etc., 0.3 μm
To 20 μm is suitable. Regarding the generation of interference fringes, there was no occurrence of unevenness of about 0.3 μm. However, if it does occur, it can be easily done by etching with an aqueous solution of NaOH to make the uneven surface even finer. Can be prevented. The present invention will be described below with reference to examples.

[0014]

[Example] 120φ aluminum drum (JIS, H4
0803003 material is used for a specified length (eg 300m)
Cut into m) and perform spigot processing on both ends. Next, in order to obtain the outer diameter dimension, a lapping process, which is commonly called roughing, is performed, and then finishing is performed. The surface roughness in this state has a height of 3 μm, and the distance between the peaks is 40 μm.

Next, without removing the work piece from the lathe, a grindstone is pressed to perform surface finishing. The processing conditions are as follows. Drum rotation speed: 250 to 300 rpm Grinding stone feed speed: 0.4 m / min to 0.48 m / mi
n Grinding stone holding pressure: 0.8 to 1.2 Kg / cm ² Grinding stone grain size: 1000 #

Under the above conditions, the peak height is 0.5 μm Rma
x, the mutual distance between the peaks is 2 μm, and a substrate having a groove-shaped concavo-convex shape is formed.
The OH aqueous solution is immersed in a solution heated to 40 ° C., and etching is performed for 15 seconds. As a pretreatment, the surface is washed with a surface active agent before etching to make the etching uniform. After the etching, as a desalting step, it is immersed in nitric acid and then washed with water and dried. Then, as a resin layer, it is dipped in a 1% solution of polycarbonate in acetone to cover the resin layer. The solvent is completely evaporated in a vacuum, and selenium and tellurium alloys have a substrate temperature of 78 ° C.
Was deposited to a thickness of 60 μm to prepare a photoconductor. This photoreceptor was subjected to a life test of continuous 50,000 copies in an atmosphere of 35 ° C. with a blade and an electrophotographic apparatus of a cleaning method using monochromatic light as a light source, and as a result, selenium peeling on the surface of the photoreceptor did not occur. In addition, the pattern of interference fringes did not occur in the image, and no other abnormality was observed, and good results were obtained.

[0017]

In the above embodiments, an example in which a cylindrical (drum) -shaped support is used as the support has been described, but it is obvious that a flat support or a flexible support can be used. As is apparent from the above description, according to the present invention, the adhesiveness of the photosensitive layer can be improved, and a good image quality with less generation of interference fringes can be obtained, which is a great practical effect.

[Brief description of drawings]

FIG. 1 is a structural diagram of an embodiment of the present invention.

FIG. 2 is a structural diagram of an embodiment of the present invention.

[Explanation of symbols]

 1 Support 1a Concavo-convex part 1a 'Concavo-convex part 1b Concavo-convex part 2 Intermediate layer 3 Photoconductive (photosensitive) layer

Claims (1)

[Claims] 1. An electrophotographic photosensitive member comprising a support having a roughened surface and a photoconductive layer directly or through an intermediate layer, wherein the roughened surface has a substantially flat groove-like unevenness formed by grinding. A method for producing an electrophotographic photosensitive member, which is characterized in that it is formed in an uneven shape having a peak height of 0.3 μm to 2 μm and a mutual distance between peaks of 20 μm or less.