Nok Corporation

Synztec Co., Ltd.

Nok Klueber Co., Ltd.

Kousuke Oura

Kenji Sasaki

Shogo Suzuki

Satoshi Fukuoka

Masaki Tahara

Hiroshi Ogura

An electroconductive roll includes a core member, a rubber base material disposed around the core member, and a surface layer disposed around the rubber base material. The arithmetic mean peak curvature Sof a surface of the surface layer is equal to or greater than 1,880 (1/mm), and is equal to or less than 14,024 (1/mm).

Electroconductive roll

An electroconductive roll includes a core member, a rubber base material disposed around the core member, and a surface layer disposed around the rubber base material. The surface area of the surface layer per unit projected area is equal to or greater than 1.255, and is equal to or less than 6.635.

Charging roll

An electroconductive roll includes a core member, a rubber base material disposed around the core member, and a surface layer disposed around the rubber base material. The density of peaks Sof the surface of the surface layer is equal to or greater than 93,406 (1/mm), and is equal to or less than 153,027 (1/mm).

This conductive roll includes: at least one elastic layerincluding primarily a conductive rubber body and provided along the outer periphery of a core; and a coating layerprovided along the outer periphery of the elastic layer. The conductive roll satisfies the following expressions: circumference Sm1&#x2264;135 &#x3bc;m and circumference Sm1&#x3c;circumference Sm2 wherein circumference Sm1 represents an average interval Sm of irregularities along the circumferential direction of the elastic layer, and circumference Sm2 represents an average interval Sm of irregularities along the circumferential direction of the coating layer

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Fujisawa, Japan

Kousuke Oura