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AssigneeSharp Kabushiki Kaisha
InventorsYuriko Shindoh, Kazushige Morita, Hiroko Ishibashi, Yoshihide Shimoda, Masanori Matsumoto
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An electrophotographic image forming apparatus according to the present invention includes: a multiple number of image forming stations for multiple development colors including black, each station having a photoreceptor, an exposure device, a developing device for developing each static latent image with the toner of each development color; a recording media conveyer belt conveying, along the photoreceptors, a recording medium on which a monochrome toner image is formed or a color image is formed by overlapping multiple colors of toner images, wherein each of the photoreceptors has a charge transport layer composed of a binder resin that is a blend of at least two kinds of resins, the blended ratio of at least two kinds of binder resins for the photoreceptor for black is made different from that of the binder resins for the photoreceptors for the other development colors so that the photoreceptor for black presents a greater abrasion resistance than the photoreceptors for other development colors. This arrangement makes it possible to use all the photoreceptors for black and colors, for and within, a concurrent period and provide a low-cost apparatus.
An image forming apparatus comprising a multiple number of electrophotographic image forming stations for multiple development colors including black, arranged in line in the paper feed direction, each image forming station having a photoreceptor, a charger, an exposure device, a developing device, a transfer device and a cleaning device, characterized in that each of the photoreceptors has a charge transport layer which is formed of a charge transport material and a blend of, at least, two kinds of binder resins, the blended ratio of at least two kinds of binder resins for the photoreceptor for black is made different from that of the binder resins for the photoreceptors for the other development colors so that the photoreceptor for black presents a greater abrasion resistance than the photoreceptors for the other development colors.
Dependencies are inferred from the claim text.