Ricoh Company, Ltd.

Noboru Toriu

Mitsuaki Hirose

Akihiro Sugino

Keisuke Shimoyama

Tomoharu Asano

Tadayoshi Uchida

Hideki Nakamura

Yohta Sakon

Masahiro Ohmori

Shinji Nohsho

Hideo Nakamori

Daisuke Kubo

Hiroki Orii

Shuya Sugimoto

Kaori Harada

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

In a photoreceptor including an electroconductive substrate; a photosensitive layer; and a protective layer, the protective layer includes a crosslinked resin having a residual group of a polycarboxylic acid compound and a group having the below-mentioned formula (10), and at least one of a compound having the below-mentioned formula (2) and a compound having the below-mentioned formula (3). wherein each of R5 and R6 independently represents a hydrogen atom, or a substituted or unsubstituted alkyl group having 1 to 3 carbon atoms. wherein each of Rand Rindependently represents a hydrogen atom, or an alkyl group having 1 to 4 carbon atoms, and Zrepresents a vinylene group, a divalent aromatic hydrocarbon group having 6 to 14 carbon atoms, or a 2,5-thiophenediyl group. wherein each of Arand Arindependently represents an aromatic group having 6 to 14 carbon atoms, Zrepresents a divalent aromatic hydrocarbon group having 6 to 14 carbon atoms, and each of Rand Rindependently represents a hydrogen atom, or a methyl group.

Photoreceptor, method for preparing photoreceptor, and image forming apparatus and process cartridge using the photoreceptor

An image forming apparatus, including a photoreceptor; a charger; an irradiator; an image developer; a transferer; a fixer; and a cleaning blade formed of a strip-shaped elastic blade, removing a powder from the surface of the photoreceptor passing an edge line of the blade while contacting thereto, wherein the photoreceptor includes a crosslinked resin surface layer formed of at least one of an acrylic resin and a methacrylic resin, and the cleaning blade includes a contact point with the photoreceptor, including a substrate; a mixed layer formed of at least one of an acrylic resin and a methacrylic resin, located at the surface of the substrate; and a surface layer formed of at least one of an acrylic resin and a methacrylic resin, located on the surface of the substrate.

Image forming apparatus and process cartridge

An electrophotographic photoconductor drum having a cylindrical hollow support with a length L (cm), provided that L is 30 cm or more, a photoconductive layer provided on an external surface of the cylindrical hollow support, with a total weight of the support and the photoconductive layer being W1 (g), and a weight-controlling member, with a total weight of the above-mentioned weight W1 (g) and the weight-controlling member being W2 (g), the length L, the weight W1 and the weight W2 satisfying the relationship of formula (1) of log(W1/L.sup.3).ltoreq.-2.4 and the formula (2) of log(W2/L.sup.3)&gt;-2.4.

Electrophotographic photoconductor drum with weight-controlling member

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Shizuoka, Japan

Noboru Toriu