| 摘要 |
PURPOSE:To prevent black spots by sealing pinholes of the anodized film on an aluminum substrate with a sealant composed essentially of nickel fluoride. CONSTITUTION:The pinhole treatment is executed by dipping the anodized film formed on the aluminum substrate into an aqueous solution containing nickel fluoride as a main component in the most effective concentration of 3-6g/l, preferably, at a temperature of 25-40 deg.C and a pH of 4.5-6.5. A preferable thickness of the sealed anodized film is 0.5-20nm. It is preferred to form the laminate type photoconductive layer composed of an electric charge generating layer and a charge transfer layer on the anodized film. Since this sealing step can be processed at low temperature, occurrence of defects, such as uneven drying, on the surface of the anodized film is reduced. |
