JPH0588391A - Substrate for electrophotographic sensitive body and its manufacture - Google Patents

Abstract

PURPOSE:To obtain the substrate for an electrophotographic sensitive body and its manufacture, substrate which is manufactured by an easier method compared with the conventional one and suitable for manufacturing the photosen sitive body having excellent property. CONSTITUTION:A substrate for electrophotographic sensitive bodies 1 consists of aluminum or aluminum alloy on whose surface is formed an anodic oxidation coating 12 whose surface is the one which is polished with grinding grains and given random finishing in the >=0.4 to <=0.8mum surface roughness, Ra. range. The substrate is manufactured by cutting or grinding the surface of a substrate 1 consisting aluminum or aluminum alloy before giving it anodic oxidation treatment and polishing the surface of the anodic oxidation coating thus formed with grinding grains.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a substrate for an electrophotographic photosensitive member having a photosensitive layer using an organic photoconductive material and a method for manufacturing the same.

[0002]

2. Description of the Related Art Electrophotographic photoreceptors (hereinafter, referred to as "image forming members" used as image forming members for electrophotographic copying machines, printers, etc.
(Also simply referred to as a photoconductor) is composed of a conductive substrate and a photosensitive layer provided on the conductive substrate and containing a photoconductive material. Aluminum or aluminum alloy is generally used as the material of the conductive substrate. However, in the case of an organic photoreceptor in which the photosensitive layer is formed of an organic material, the quality and shape of the surface of the substrate is the adhesion of the photosensitive layer, The film thickness uniformity and film uniformity are greatly affected, and the electrical characteristics of the photoconductor, fatigue, image quality (image scratches, black spots, white spots, density changes, interference fringe patterns, etc.),
As it has a bad effect on the service life, etc., as a countermeasure, the substrate surface is processed into a specific shape, the cleaning method of the substrate surface is devised, the substrate surface is subjected to anodizing treatment, and the substrate surface has a special coating layer. Is provided.

[0003]

As described above, the quality and shape of the surface of the substrate used has a great influence on obtaining a photoreceptor having excellent characteristics, but conventionally, in order to obtain a suitable substrate. It required advanced technology and equipment, and required time to process it. For example, in order to increase the adhesion of the photosensitive layer, the roughness of the substrate surface may be increased, but if it becomes too rough, there is a problem that uneven film formation occurs in the photosensitive layer and image defects occur. Has a problem that if it has periodicity, it appears in the image, and it is important to uniformly and randomly present the substrate surface with appropriate roughness. To do.
In addition, if cleaning is not performed sufficiently after surface roughening, residual stains may cause uneven film formation on the photosensitive layer, and the cleaning may deteriorate the surface of the substrate to lower the adhesion or adversely affect the photoreceptor characteristics. Since there are some, the cleaning method is also important. When a coating layer is provided on the surface of the substrate to improve the characteristics of the photoreceptor, it is difficult to select the material. For a substrate made of aluminum or an aluminum alloy, an anodic oxide film is formed on the surface to improve the adhesion of the photosensitive layer and the characteristics of the photoconductor. It is difficult to select processing conditions. The present invention has been made in view of the above points, and is a substrate for an electrophotographic photosensitive member suitable for producing a photosensitive member which is obtained by an easier method than conventional ones and has excellent characteristics, and the same. The problem to be solved is to provide a manufacturing method.

[0004]

According to the present invention, the above-mentioned problems are made of aluminum or an aluminum alloy, and an anodic oxide film is formed on the surface thereof, and
An electrophotographic photosensitive member which is a surface which is finely and randomly finished by polishing the surface of the anodic oxide film with abrasive grains so that the surface roughness of the center line average roughness Ra is 0.4 μm or more and 0.8 μm or less. The problem can be solved by using a substrate for use. Such a substrate is obtained by cutting the surface of a substrate made of aluminum or an aluminum alloy and then subjecting it to anodization treatment, and polishing the surface of the formed anodized film with abrasive grains, or from an aluminum or aluminum alloy. It is preferably manufactured by polishing the surface of the base body to be anodized and then subjecting it to anodizing treatment and polishing the surface of the formed anodized film with abrasive grains. The material of the abrasive grains for polishing the surface of the anodized film is preferably Al ₂ O ₃ .

[0005]

According to the present invention, the surface of the anodic oxide film, which is the outermost surface of the electrophotographic photoreceptor substrate, is polished with abrasive grains, and the surface formed thereby determines the performance of the substrate. Therefore, the surface of the substrate made of aluminum or aluminum alloy may be processed by general cutting or polishing, and the subsequent cleaning may be performed by a usual method. Further, most of the residues and stains after the anodizing treatment are mechanically removed by polishing, so that it is not necessary to perform precise cleaning as in the conventional case. Thus, it is possible to obtain a substrate suitable for a photoconductor, which is technically easier than the conventional one and can be obtained in a short time. The surface roughness of the anodized film surface is Ra of 0.4 μm or more and 0.1.
It is necessary to finish polishing with abrasive grains so as to form a finely random shape within a range of 8 μm or less. By using such a substrate, it becomes possible to obtain a photoreceptor having excellent characteristics.

[0006]

EXAMPLE An outer surface of a cylindrical substrate made of Al alloy is machined by cutting or polishing and washed, and then a film thickness of 5 μm is formed on the surface.
An anodized film of 10 μm is formed. The surface of the anodic oxide film is polished by the polishing apparatus shown in the conceptual diagram of FIG. 4, FIG. 4 (a) shows a side view of the device,
FIG. 4B shows a top view of the apparatus, and 108 is a tape polishing unit including a tape pressing roller 102, a tension roller 103, a tape supply reel 104, and a tape take-up reel 105, 101 is a base, and 106 is a polishing. The oil supply nozzle 107 is a polishing tape. While rotating the cylindrical substrate 101 in the direction of arrow A, while pouring the polishing oil from the polishing oil supply nozzle 106, the surface of the cylindrical substrate 101 is fed from the tape supply reel 104 and travels in the direction of arrow C to wind the tape take-up reel. The surface of the substrate 101 is polished by pressing the polishing tape 107 wound around the substrate 105 with the pressing roller 102 and moving the tape polishing unit 108 in the direction of arrow E. The tension roller 103 applies tension so that the polishing tape 107 does not loosen during polishing. With such a polishing apparatus, the surface of the anodized film of the substrate was about 1 μm under the conditions shown in Table 1 below.
Polishing is performed to obtain a randomly shaped surface having a roughness Ra of 0.4 μm to 0.8 μm.

[0007]

[Table 1]

The polishing tape is made of abrasive grain material Al ₂ O ₃ ,
An abrasive having a grain size of 12 μm (Supplied by Sumitomo 3M Co., Ltd .: wrapping film # 1200) was used, and the polishing oil was HS-5 manufactured by Idemitsu Kosan Co., Ltd. A schematic cross-sectional view of the base body before polishing is shown in FIG. 2, and a schematic cross-sectional view of the base body after polishing is shown in FIG. Before polishing, as shown in FIG. 2, Al alloy substrate 1
1 and the surface of the anodized film 12 are rough, but after polishing, as shown in FIG.
The surface of No. 2 has almost no plane and has a shape close to a plane.

A photosensitive layer is formed on the surface of the substrate manufactured as described above, and A as shown in the schematic sectional view of FIG.
By preparing a photoreceptor having the photosensitive layer 2 on the substrate 1 composed of the substrate 11 and the anodic oxide film 12, it is possible to obtain a photoreceptor having excellent characteristics and good images. Further, FIG. 5 is a schematic cross-sectional view showing an example of a different photoreceptor, in which a photosensitive layer 2 comprising a charge generating layer 21 and a charge transport layer 22 is provided on a substrate 1 comprising an Al substrate 11 and an anodized film 12. is there. In such a function-separated type photoreceptor,
The charge generation layer needs to be an extremely thin film,
Since the substrate according to the present invention has a substantially flat surface, a charge generation layer having a uniform film thickness and a uniform thickness can be easily formed thereon, and the effect of the present invention is more remarkable.

Further, in order to see the effect of the present invention, a photoconductor was prepared by using a substrate manufactured by changing the manufacturing method of the substrate as shown in Table 2 below, and the obtained image was evaluated. The results are also shown in Table 2.

[0011]

[Table 2]

As shown in Table 2, the surface of the Al substrate was cut or polished, followed by anodizing to form a film, and the surface of the anodized film was polished by abrasive grains. Photoreceptor manufactured using the substrate
No. 6 is a photoreceptor having very few image defects and excellent characteristics, and the effect of the present invention is clear.

[0013]

According to the present invention, the surface of a substrate made of aluminum or an aluminum alloy is subjected to cutting or polishing and then anodized, and the surface of the formed anodic oxide film is polished with abrasive grains. Therefore, it is possible to easily manufacture a substrate suitable for manufacturing a photoconductor having excellent characteristics as compared with the related art. It is excellent to use a substrate produced by such a method and having a finely and randomly finished surface within a range of 0.4 μm or more and 0.8 μm or less in surface roughness average center line Ra. It becomes possible to manufacture an electrophotographic photosensitive member having characteristics and capable of stably obtaining a high-quality image.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of an embodiment of a photoconductor of the present invention.

FIG. 2 is a schematic cross-sectional view of a substrate before polishing an anodized film surface.

FIG. 3 is a schematic cross-sectional view of a substrate after polishing the surface of an anodized film.

FIG. 4 is a conceptual diagram of an example of a polishing apparatus used for polishing the surface of the anodized film of the present invention.

FIG. 5 is a schematic cross-sectional view of another embodiment of the photoconductor of the present invention.

[Explanation of symbols]

 1 Substrate 2 Photosensitive Layer 11 Al Substrate 12 Anodized Film 21 Charge Generation Layer 22 Charge Transport Layer 101 Substrate 102 Tape Pressing Roller 103 Tension Roller 104 Tape Supply Reel 105 Tape Winding Reel 106 Polishing Oil Supply Nozzle 107 Polishing Tape 108 Tape Polishing Unit

Claims (4)

[Claims] 1. An aluminum or aluminum alloy, an anodized film is formed on the surface of the anodized film, and the surface of the anodized film is polished with abrasive grains so that the surface roughness is a center line average roughness Ra. A substrate for an electrophotographic photoreceptor, which has a finely and randomly finished surface within a range of 0.4 μm or more and 0.8 μm or less. 2. A surface of a substrate made of aluminum or an aluminum alloy is cut and then anodized,
A method of manufacturing a substrate for an electrophotographic photosensitive member, which comprises polishing the surface of the formed anodic oxide film with abrasive grains. 3. A surface of a substrate made of aluminum or an aluminum alloy is polished and then anodized,
A method of manufacturing a substrate for an electrophotographic photosensitive member, which comprises polishing the surface of the formed anodic oxide film with abrasive grains. 4. The method of claim 2 or 3 material of the abrasive grains to polish the surface of the anodized film is characterized in that it is a Al ₂ O ₃
A method for producing a substrate for an electrophotographic photoreceptor as described above.