Ricoh Company, Ltd.

Tomio Kondoh

Hitoshi Iwatsuki

Shinichiro Yagi

Kohsuke Suzuki

A carrier contains a core; and a cover layer located overlying the core, wherein the cover layer comprises a binder resin, a first particulate material and a second particulate material, wherein the following relationships are satisfied: 1&#x3c;(D1/h)&#x3c;10, and 0.001&#x3c;(D2/h)&#x3c;1, wherein D1(&#x3bc;m) represents a volume average particle diameter of the first particulate material, D(&#x3bc;m) represents a volume average particle diameter of the second particulate material, and h (&#x3bc;m) represents a thickness of the cover layer, and wherein the second particulate material has a volume resistivity of not greater than 1.0&#xd7;10&#x3a9;&#xb7;cm.

Electrophotographic carrier, developer, developer container, process cartridge, image forming apparatus and image forming method

A carrier containing a core material and a resin coating layer located overlying the surface of the core material. The resin coating layer contains resin and electroconductive particles having an oil absorption amount of from 10 to 300 ml/100 g. The electroconductive particle contains a base material particle and an electroconductive coating layer located overlying the surface of the base material particle. The electroconductive coating layer contains an underlayer containing tin dioxide and an upper layer containing indium oxide and tin dioxide, located overlying the underlayer.

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Numazu, Japan

Tomio Kondoh