JPH0580565A - Substrate for electrophotographic photoreceptor and method for producing the same - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide an electrophotographic photoreceptor substrate capable of favorably producing an electrophotographic photoreceptor capable of obtaining a high-quality image in which an interference fringe pattern does not occur, and a method for producing the same. In an electrophotographic photoreceptor substrate having an anodized film formed on the surface of a substrate made of aluminum or an aluminum alloy, the surface of the anodized film, which is the substrate surface, has a surface roughness Ra of 0.10 μm or more. The substrate for an electrophotographic photosensitive member is roughened within a range of 13 μm or less. Such a substrate has a liquid temperature of 2 on the surface of the substrate made of mirror-finished aluminum or aluminum alloy.
By performing anodizing treatment using an electrolytic solution at a temperature of less than 0 ° C., or having a triangular corrugated shape and a surface roughness Ra of 0.1.
The surface of the anodic oxide film formed after anodizing the surface of the substrate made of aluminum or aluminum alloy roughened to 5 μm or more with an electrolytic solution having a liquid temperature of 20 ° C. or higher Can be manufactured by roughening so that Ra is in the range of 0.10 μm or more and 0.13 μm or less.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conductive substrate for an electrophotographic photosensitive member provided with a photosensitive layer made of an organic photoconductive material and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, inorganic materials such as Se, CdS and ZnO have been widely used as photoconductive materials for electrophotographic photoreceptors. However, electrophotographic photoreceptors using these inorganic materials have not always satisfied the performance required in terms of heat resistance, durability, toxicity and the like. In recent years, organic materials have been attracting attention in place of these inorganic materials. When an organic material is used, there is an advantage that the manufacturing cost can be particularly reduced. As a conductive substrate of an electrophotographic photosensitive member using such an organic photoconductive material, generally, in order to prevent image defects due to burrs of the substrate, the surface of the substrate made of aluminum or aluminum alloy is triangular with a bite. A conductive substrate having a corrugated surface roughened and then anodized to form an anodized film is used.

[0003]

However, in the electrophotographic photoreceptor using a conductive substrate having an anodized film formed on the surface of a substrate made of aluminum or an aluminum alloy as described above, the electrophotographic application to be mounted is carried out. When the exposure light of the device (writing light to the electrophotographic photosensitive member) is coherent light such as laser light or light emitting diode light, the exposure light may pass through the anodized film depending on the wavelength and may be aluminum or aluminum. There is a problem that the exposure light that reaches the surface of the base made of an alloy, and the exposure light reflected there interferes with the exposure light reflected on the surface of the anodized film, and an interference fringe pattern is generated on the obtained image. This interference fringe pattern tends to occur when the semiconductor laser light is used as the exposure light. Further, there is a problem that an interference fringe pattern is generated on an image obtained by the interference of the exposure light reflected multiple times in the photosensitive layer and the exposure light reflected on the surface of the anodized film.

The present invention solves the above-mentioned problems and provides an electrophotographic photoconductor substrate and a method for producing the same, which makes it possible to favorably produce an electrophotographic photoconductor capable of obtaining a high-quality image in which no interference fringe pattern occurs. It is a task to try to solve.

[0005]

According to the present invention, the above object is to provide an electrophotographic photoconductor substrate having an anodized film formed on the surface of a substrate made of aluminum or an aluminum alloy. Is solved by using a substrate for an electrophotographic photosensitive member that is roughened so that the centerline average roughness Ra is in the range of 0.10 μm or more and 0.13 μm or less. Such a substrate for an electrophotographic photoreceptor can be manufactured by subjecting the surface of a substrate made of aluminum or an aluminum alloy to mirror finishing and then subjecting it to an anodic oxidation treatment using an electrolytic solution having a liquid temperature of less than 20 ° C. Further, the surface of the base body made of aluminum or aluminum alloy is roughened so as to have a center line average roughness Ra of 0.15 μm or more in a triangular corrugated shape, and then anodized. It can also be manufactured by roughening the center line average roughness Ra so that it falls within the range of 0.10 μm or more and 0.13 μm or less.

[0006]

The center line average roughness Ra of the surface of the anodic oxide film, which is the outermost surface of the electrophotographic photoreceptor substrate, is 0.10 μm or more and 0.1.
By roughening the surface so that it falls within the range of 13 μm or less, the exposure light incident on the electrophotographic photosensitive member is diffusely reflected on the surface of the anodized film, passes through the anodized film, and is the surface of the substrate made of aluminum or an aluminum alloy. It is possible to prevent optical interference with the exposure light reflected from the photosensitive layer and optical interference with the exposure light reflected multiple times in the photosensitive layer. When the surface roughness Ra of the anodized film surface is less than 0.10 μm, the effect of roughening is reduced, and when Ra exceeds 0.13 μm, the film forming property of the photosensitive layer formed thereon is impaired. It is not preferable.

When anodizing the surface of a substrate made of aluminum or an aluminum alloy, the liquid temperature should be 2
When an electrolyte solution of 0 ° C or higher is used, an anodized film whose bottom surface and surface are almost parallel to each other is formed. Therefore, the exposure light reflected on the anodized film surface and the anodized film are transmitted through the aluminum. Or, it is not possible to prevent light interference with the exposure light reflected from the surface of the aluminum alloy substrate, and when the surface of the aluminum or aluminum alloy substrate is mirror-finished. In addition, since the surface of the anodic oxide film also becomes a mirror surface, it is not possible to prevent optical interference between the exposure light reflected on the surface of the anodic oxide film and the exposure light multiply reflected in the photosensitive layer. When the above-described anodizing treatment is performed using an electrolytic solution having a liquid temperature of less than 20 ° C., the anodized film is formed in a state where the surface is roughened, so that it is possible to prevent any of the above-mentioned optical interference. Even when the above-mentioned anodizing treatment is performed using an electrolytic solution having a liquid temperature of 20 ° C. or higher, roughening the surface of the anodized film as a post-treatment can prevent any of the above optical interference. It will be possible. Therefore, by using the electrophotographic photoreceptor substrate according to the method of the present invention,
It is possible to obtain an electrophotographic photosensitive member that can obtain a high-quality image in which no interference fringe pattern occurs.

[0008]

Embodiments of the present invention will be described below. Example 1 A mirror-finished surface was applied to the outer surface of a cylindrical substrate made of aluminum, and then anodization was performed for 10 minutes at a current density of 2.5 A / dm ² using an electrolytic solution having a liquid temperature of 18 ° C. and a sulfuric acid concentration of 100 g / l. A anodic oxide film having a film thickness of 7 μm was formed by treatment, and subsequently, sealing treatment was performed with a warm water solution having a liquid temperature of 97 ° C. and a nickel acetate concentration of 10 g / l to prepare a substrate for an electrophotographic photoreceptor. The surface roughness of this substrate was 0.12 μm in terms of center line average roughness Ra. Example 2 The outer surface of a cylindrical substrate made of aluminum was roughened with a cutting tool so as to have a triangular corrugated shape and a surface roughness Ra of 0.16 μm, and then the temperature of the anodizing electrolytic solution was adjusted to 2
The film thickness was 7 μm in the same manner as in Example 1 except that the temperature was 1 ° C.
The anodized film of No. 1 was formed, and then the sealing treatment was carried out in the same manner as in Example 1. Then, the surface roughness of the anodized film was Ra with a polishing tape (Micro Finishing Film made by 3M, 9 μm). A substrate for an electrophotographic photosensitive member was produced by roughening the surface to 11 μm. Comparative Example 1 In Example 1, the liquid temperature of the electrolytic solution for the anodizing treatment was set to 21.
A substrate for an electrophotographic photosensitive member was produced in the same manner as in Example 1 except that the temperature was set to ° C. The surface roughness Ra of this substrate is 0.
It was 04 μm. Comparative Example 2 An electrophotographic photosensitive member substrate was prepared in the same manner as in Example 2 except that the surface of the anodized film was not roughened with the polishing tape. The surface roughness Ra of this substrate was 0.16 μm.

A photosensitive layer formed by sequentially stacking a charge generation layer and a charge transport layer made of an organic material on each of these electrophotographic photoreceptor substrates is provided, and Example 1, Example 2, Comparative Example 1, Comparative An electrophotographic photosensitive member of Example 2 was produced. The electrophotographic photoreceptor thus obtained is mounted on a commercially available semiconductor laser beam printer to display an image, and the exposure light reflected on the surface of the anodized film and the light transmitted through the anodized film and reflected from the surface of the aluminum substrate. An interference fringe pattern due to optical interference with the incoming exposure light (referred to as an interference fringe pattern A), and an interference fringe pattern due to optical interference between the exposure light reflected on the surface of the anodic oxide film and the exposure light multiply reflected within the photosensitive layer ( The occurrence of interference fringe pattern B) was examined. The results are the processed and finished state (referred to as finish) of the outer surface of the cylindrical substrate made of aluminum, which is the main manufacturing condition of the electrophotographic photoreceptor substrate, the temperature of the electrolytic solution used for the anodizing treatment (electrolyte temperature Ra) indicating the presence or absence of roughening of the surface of the anodized film (referred to as surface roughening) with a polishing tape and the roughness of the surface of the anodized film.
It is shown in Table 1 together with (denoted as Ra).

[0010]

[Table 1]

As shown in Table 1, in the electrophotographic photosensitive member of Example 1, neither the interference fringe pattern (A) nor the interference fringe pattern (B) is generated on the image, but the electrophotographic photosensitive member of Comparative Example 1 is on the image. Both the interference fringe pattern (A) and the interference fringe pattern (B) are generated. The difference occurs because both of them use a mirror-finished aluminum substrate whose surface has been subjected to anodizing treatment, because the anodizing conditions are different. When an electrolytic solution having a liquid temperature of 20 ° C or higher is used, a film whose bottom surface and surface are substantially parallel is formed, but when an electrolytic solution having a liquid temperature of less than 20 ° C is used, the bottom surface of the film is smooth. Even with this, a film with a rough surface is formed. As a result, the substrate used in Comparative Example 1 was almost mirror-like both on the surface of the aluminum substrate and on the surface of the anodic oxide film, and the roughness Ra was 0.04 μm, which was extremely small, and interference fringe patterns A and B were observed.
Both of them occur, but the surface of the anodized film of the substrate used in Example 1 has a Ra of 0.12 μm, and the interference fringe pattern does not occur. The method for producing the electrophotographic photoreceptor substrate of the present invention in which the surface of the mirror-finished aluminum substrate is subjected to anodizing treatment using an electrolytic solution having a liquid temperature of less than 20 ° C., and the effect of the substrate obtained by the method are it is obvious. Further, in the electrophotographic photosensitive member of Example 2, neither the interference fringe pattern (A) nor the interference fringe pattern (B) is generated on the image as in the electrophotographic photosensitive member of Example 1, but the electrophotographic photosensitive member of Comparative Example 2 An interference fringe pattern (A) is generated on the body. Comparative example 2
In this example, a triangular corrugated aluminum substrate roughened to a Ra of about 0.16 μm is anodized on the surface of the aluminum substrate using an electrolytic solution having a liquid temperature of 21 ° C. The surface of the anodized film, which is the surface of the substrate of Example 2, was further appropriately treated with an abrasive tape.
Therefore, the surface of the anodized film of the former substrate and the surface of the aluminum substrate are substantially parallel and at substantially the same level, and the exposure light reflected by the surface of the anodized film, which is the surface of the substrate, and the anodized film pass through the aluminum substrate. Interference with the exposure light reflected on the surface causes an interference fringe pattern (A) on the image,
The latter substrate surface has an Ra of 0.11 μm, which is appropriate regardless of the rough surface shape of the aluminum substrate, so that no optical interference occurs and no interference fringe pattern (A) or interference fringe pattern (B) appears on the image. Does not occur. Ra is 0.16μ in triangular waveform
Liquid temperature 2 on the surface of the aluminum substrate roughened to about m
A method for producing a substrate for an electrophotographic photoreceptor of the present invention, in which an anodized film is formed by using an electrolytic solution at 1 ° C. to form an anodized film, and the surface thereof is roughened with a polishing tape, and a substrate obtained by the method. The effect of is also clear. In Example 2 described above, the surface of the anodic oxide film was roughened with a polishing tape, but the roughening method is not limited to this.

[0012]

According to the present invention, in an electrophotographic photoconductor substrate having an anodized film formed on the surface of a substrate made of aluminum or an aluminum alloy, the surface of the anodized film, which is the substrate surface, has a center line average roughness. Ra is 0.
The electrophotographic photoreceptor substrate is roughened so as to be in the range of 10 μm or more and 0.13 μm or less. Such a substrate for an electrophotographic photoreceptor is obtained by subjecting the surface of a substrate made of aluminum or an aluminum alloy to mirror finishing and then subjecting it to anodization treatment using an electrolytic solution having a liquid temperature of less than 20 ° C. The surface of the base body made of an alloy has a triangular wavy shape and a center line average roughness Ra.
Is roughened to 0.15 μm or more and then anodized, and then the center line average roughness Ra of the anodized film surface is adjusted to be in the range of 0.10 μm or more and 0.13 μm or less. It can be produced by roughening, but by using such a substrate for an electrophotographic photoreceptor, it is preferable to produce an electrophotographic photoreceptor capable of obtaining a high-quality image in which an interference fringe pattern does not occur. Is possible.

Claims (3)

[Claims] 1. An electrophotographic photosensitive substrate comprising an aluminum or aluminum alloy substrate having an anodized film formed on the surface thereof, wherein the anodized film has a center line average roughness Ra of 0.10 μm to 0.13 μm. A substrate for an electrophotographic photosensitive member, which is roughened within the following range. 2. A method for producing a substrate for an electrophotographic photoreceptor, which comprises subjecting the surface of a substrate made of aluminum or an aluminum alloy to mirror finishing and then subjecting the substrate to an anodic oxidation treatment using an electrolytic solution having a liquid temperature of less than 20 ° C. .. 3. A surface of a substrate made of aluminum or aluminum alloy is roughened so as to have a center line average roughness Ra of 0.15 μm or more in a triangular corrugated shape, and then anodized. A method for producing a substrate for an electrophotographic photosensitive member, which comprises performing a roughening process so that a center line average roughness Ra is within a range of 0.10 μm or more and 0.13 μm or less.