Ricoh Company, Ltd.

Takeo Araki

Tsuyoshi Imamura

Makoto Nakamura

Kyoichi Ashikawa

Kenji Narita

Kenichi Ishiguro

Kyota Koetuka

Takahiro Yasunaga

Fumio Okuya

Hisatsugu Nagano

Yasuhiro Hujimori

A cylindrical structural body for use in an image forming apparatus and a method of producing the same are disclosed. The structural includes a cylindrical sleeve and flanges or similar end members respectively affixed to opposite ends of the sleeve. The flanges can be firmly and easily affixed to the sleeve without causing the sleeve to deform. The structural body is therefore low cost and highly accurate.

Cylindrical structural body for use in an image forming apparatus and

A developing roller of monocomponent developing system, in which a low hygroscopic material is used for a dielectric layer, thereby suppressing a change of electric properties of the layer caused by water absorption, that is, a dielectric layer using a low hygroscopic material, namely, a low hygroscopic elastomer or a low hygroscopic polymer is used at an outer surface of a conductive supporting body where, as a concrete example of the elstomer or the polymer, polyethylene, polypropylene, ethylenic copolymer, rigid polyvinyl chloride, fluoro resin, acetal resin or mixtures thereof, or the elastomer or the polymer in which manganese-aluminum magnet, strontium ferrite, barrium ferrite of mixtures thereof is dispersed.

Developing roller of monocomponent developing system

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Isehara, Japan

Takeo Araki