Ricoh Company, Ltd.

Yamanashi Electronics Co., Ltd.

Tadayoshi Uchida

Hajime Suzuki

Hideki Nakamura

Eiji Kurimoto

Noboru Toriu

Naoki Nakatake

Takaaki Ikegami

Keisuke Shimoyama

Atsushi Takehara

Kohsuke Yamamoto

Mitsuaki Hirose

Toshihiko Koizumi

Hiroki Orii

Tsuyoshi Ueda

Kaori Harada

Shuya Sugimoto

Takumi Shinohara

Ryoji Kobayashi

An electrophotographic photoconductor is provided that includes a conductive substrate, an undercoat layer overlying the conductive substrate, and a photosensitive layer overlying the undercoat layer. The undercoat layer contains zinc oxide particles and a binder resin and has a volume resistivity of 0.03&#xd7;10&#x3a9;&#xb7;cm or less in an electrical field of 5 V/&#x3bc;m at a temperature of 23 degrees C. and a relative humidity of 55%. The photosensitive layer contains a compound represented by the following general formula (1): where each of Rto Rindependently represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 6 carbon atoms which may have a substituent, or a substituted or unsubstituted aryl group having 6 to 12 carbon atoms.

Electrophotographic photoconductor, image forming apparatus, and process cartridge

A photoconductor is used for an image-forming apparatus, and the photoconductor has a surface including irregularities having an arithmetic average roughness of 0.1 &#x3bc;m or more and 0.5 &#x3bc;m or less in a cycle length from 867 to 1,654 &#x3bc;m.

Photoconductor, image-forming apparatus, and cartridge

An electrophotographic photoconductor including: an electroconductive substrate; an intermediate layer; and a photoconductive layer, the intermediate layer and the photoconductive layer being on the electroconductive substrate, wherein the intermediate layer includes an inorganic pigment and a binder resin, wherein a volume ratio of the inorganic pigment in the intermediate layer is 30% by volume to 50% by volume, wherein the inorganic pigment comprises titanium oxide and a content of the titanium oxide in the inorganic pigment is 70% by mass to 90% by mass, wherein the inorganic pigment has a specific surface area of 70 m/g to 140 m/g, and wherein the intermediate layer has a volume resistivity at an electrical field intensity of 2.5&#xd7;10V/cm of 5&#xd7;10&#x3a9;&#xb7;cm to 1&#xd7;10&#x3a9;&#xb7;cm.

Electrophotographic photoconductor, electrophotographic apparatus and process cartridge

An electrophotographic photoconductor including an electroconductive support and a photoconductive layer provided thereon, wherein the photoconductive layer includes a charge generating material, an electron transporting material and a hole transporting material, the electron transporting material being a diphenoquinone compound represented by formula (1) described herein, the hole transporting material being a compound represented by formula (2) described herein.

Electrophotographic photoconductor

To provide an electrophotographic photoconductor including: a substrate; a charge generating layer; and a charge transporting layer, the charge generating layer and the charge transporting layer being disposed over the substrate, wherein the charge transporting layer contains a charge transporting material represented by General Formula (I) below and an additive represented by General Formula (II) below: where R, Rand Reach independently denote any one of a hydrogen atom, a halogen atom, an alkyl group which may contain a substituent, and an alkoxy group which may contain a substituent, where Rand Reach denote a tertiary butyl group, and Rand Reach independently denote one of an alkyl group which may contain a substituent, and an aryl group which may contain a substituent.

Electrophotographic photoconductor, process cartridge and image forming apparatus

An electrophotographic photoreceptor that without detriment to excellent electrophotographic performance, realizes coating of any defects on a conductive substrate and excels in repetition stability and environmental performance. There is provided an electrophotographic photoreceptor having a photoreceptive layer superimposed via an undercoat layer on a conductive support, characterized in that the undercoat layer contains a polyimide resin and that at least one of the compounds of the following formulae is contained as a charge transfer agent of the photoreceptive layer. 

Electrophotographic photoreceptor with an undercoat layer containing a polyimide resin and electrophotographic apparatus with the photoreceptor

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Yamanashi, Japan

Tadayoshi Uchida