Ricoh Company, Ltd.

Satoshi Terashima

Masaki Watanabe

Makoto Nakamura

Kyohta Koetsuka

Tsuyoshi Imamura

Noriyuki Kamiya

Yoshiyuki Takano

Sumio Kamoi

Hiroya Abe

Yutaka Narita

Taisuke Tokuwaki

Tadayuki Oshima

Hiroki Furubayashi

Mieko Terashima

Shigeharu Nakamura

A development roller, including a development sleeve disposed near a photo conductive drum, a magnetic roller disposed in the development sleeve, and a supplying device configured to supply a developer including a toner and a magnetic carrier to the photo conductive drum uniformly, the development sleeve having an outer surface on which the developer including the toner and the magnetic carrier is adsorbed by a magnetic force of the magnetic roller.

Development roller including a development sleeve, surface treatment device that treats an outer surface of the development sleeve and wire member that roughens the outer surface of the development sleeve

A magnet compound material to be compression molded, said magnet compound material comprising a magnetic powder and a binder resin particles, wherein a ratio of Dv to Dn is in a range of 1.1 to 1.3, Dv and Dn of the binder resin particles denote the volume average particle diameter and the number average particle diameter, respectively.

Magnet compound material to be compression molded, a molded elongate magnetic, a magnet roller, a developing agent-carrying body, a developing apparatus and an image-forming apparatus

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Zama, Japan

Satoshi Terashima