Ricoh Company, Ltd.

Tomoko Kino

Masaki Yoshino

Kazumi Suzuki

Masato Iio

Shingo Sakashita

Jun Aoto

Tsuyoshi Asami

Tatsuya Morita

Hisao Kurosu

Yuta Shimizu

Tojiro Aoyama

Provided is a belt driving roller for a belt driving device configured to drive and rotate an endless belt with at least one driving roller of a plurality of rollers over which the belt is hung by its internal surface, wherein the belt driving roller includes an electroviscosity retaining member of which surface viscosity force reversibly changes under an effect of an electric field.

Belt driving roller including electroviscous force developing member, and belt driving device using same

An overcoat composition for electrophotography includes at least one of compounds having the following formulae (1) to (3): wherein R1 represents a hydrogen atom or a methyl group; wherein R1 represents a hydrogen atom or a methyl group; and n represents an integer of from 4 to 6; and wherein R1 represents a hydrogen atom or a methyl group; and a and b independently represent an integer of from 1 to 5 on the condition that a+b is from 4 to 6.

Overcoat composition for electrophotography, electrophotographic image forming method and electrophotographic image forming apparatus

An anisotropic magnetic material-dispersed resin carrier including: fine magnetic particles; and a binder resin in which at least the fine magnetic particles are dispersed, wherein the anisotropic magnetic material-dispersed resin carrier has a magnetic anisotropy where magnetic fields of the fine magnetic particles are orientated in the same direction, and wherein the anisotropic magnetic material-dispersed resin carrier has a saturation magnetization of 16 emu/g to 30 emu/g, a coercive force of 15 kA/m to 40 kA/m, and a number average particle diameter of 15 &#x3bc;m or more but less than 100 &#x3bc;m.

Anisotropic magnetic material-dispersed resin carrier, electrophotographic developer, and developing device

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Kanagawa, Japan

Tomoko Kino