JPS6135550B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a selenium photoreceptor for electrophotography, and more particularly to a selenium-based photoreceptor in which the material of the substrate is selected so as to maintain favorable changes in various properties of the photoreceptor over time. Conventionally, a selenium photoreceptor for electrophotography has been obtained by forming a selenium material on a conductive substrate by a method such as vapor deposition. The selenium layer is first charged with a certain amount of charge and then exposed to a pattern of light to form an electrical latent image. In this process,
Carrier movement occurs between the selenium layer and the conductive substrate, so the characteristics of the photoreceptor are greatly affected by the state of the interface between the selenium layer and the substrate and the material of the substrate. Conventionally, aluminum, SUS, etc. have been commonly used as the substrate for this selenium-based photoreceptor.
Among these, aluminum substrates are most commonly used due to their economic efficiency and ease of handling. Generally speaking, aluminum materials have different types of main additives depending on the date of use, and are broadly classified into the following seven types. (1) Pure aluminum (2) Aluminum-manganese (3) Aluminum-copper (4) Aluminum-silicon (5) Aluminum-magnesium (6) Aluminum-magnesium-silicon (7) Aluminum- The question is which of the above types is most suitable as a substrate for a zinc-based selenium photoreceptor for electrophotography. Therefore, the inventors selected the most suitable substrate for the selenium photoreceptor by mainly investigating the electrostatic properties of the photoreceptor. Regarding the electrostatic properties, we measured not only the initial properties but also the changes over time. When focusing only on the initial characteristics of the photoreceptor as an aluminum substrate for a selenium photoreceptor for electrophotography,
Almost no difference was observed depending on the type of aluminum material. However, regarding changes over time, differences were observed depending on the type of aluminum material. As a photoreceptor for electrophotography, it is essential not only to have good initial characteristics, but also to maintain the initial quality even during continuous copying in a copying machine. Therefore, the characteristics of the photoreceptor must not deteriorate over time. The test was conducted with this perspective in mind.
However, the main uses of the seven representative alloys of aluminum can be summarized as shown in the following table.

【table】

[Table] Among the above materials, the Al-Mn type (JIS3003) shown in the following table is the first choice for the aluminum substrate of selenium photoreceptors for electrophotography due to its main uses and economical efficiency.
Al-Mg system (JIS5052) seems to be suitable. The effects of adding Mn to Al-Mn systems include increased strength and improved workability. It also has the same corrosion resistance as pure aluminum. On the other hand, Mg of Al−Mg system
The effect of addition is an increase in strength. Also, its corrosion resistance is the same as pure aluminum.

[Table] Therefore, we examined the suitability of the above two materials as a substrate. On the two aluminum substrates shown in the above table, 5N selenium was vacuum-deposited to a thickness of about 50μ at a substrate temperature of 75°C, and the electrostatic properties thereof were investigated. Measurements were made by leaving the prepared sample in an environment of 50°C and checking for the deterioration of electrostatic properties after a certain period of time. FIG. 1 is a graph showing changes in surface potential over time. The surface potential (V) is the potential after being charged at +5.7KV for 20 seconds. Figure 2 shows the change in dark decay over time. Dark decay is expressed as the ratio Vo/Vs, where the charged potential is Vs and the potential Vo after being left in the dark for 20 seconds. From these figures 1 and 2, Mn is 1.0 to 1.5.
% aluminum-manganese JIS3003
A selenium photoreceptor using a material as a substrate has almost the same initial characteristics even after approximately 50 hours, whereas a selenium photoreceptor using an aluminum-magnesium-based JIS5052 material as a substrate shows significant deterioration of its initial characteristics. Is recognized. From the above results, when using an aluminum material as a substrate for a selenium photoreceptor for electrophotography, the use of the aluminum-manganese-based aluminum base material according to the present invention provides selenium with good initial properties and changes in properties over time. A photoreceptor can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a graph showing changes in surface potential over time when Al-Mn-based and Al-Mg-based aluminum materials are used as photoreceptor substrates. FIG. 2 is a graph similarly showing the change in dark decay over time. 〓〓〓〓〓

Claims (1)

[Claims] 1 As a substrate for electrophotographic photoreceptor, Mn is 1.0~
A selenium photoreceptor for electrophotography, characterized in that it uses an Al-Mn alloy plate containing 1.5%, and a photosensitive layer mainly composed of selenium is provided on the substrate.