Canon Kabushiki Kaisha

Michiko Orihara

Masayoshi Shimamura

Yasuhide Goseki

Kenji Fujishima

Kazunori Saiki

Satoshi Otake

Naoki Okamoto

Takuya Toyooka

Mayoko Maruyama

A developer carrying member for carrying a developer is includes a substrate and a resin coat layer which is formed on the surface of the substrate and contains a binder resin and a conductive fine powder. The binder resin is composed of a copolymer having a monomeric unit of a methyl methacrylate monomer (M) and a monomeric unit of a nitrogen-containing vinyl monomer (N). A copolymerization molar ratio of the methyl methacrylate monomer (M) to the nitrogen-containing vinyl monomer (N) in the copolymer fulfills the following condition: M:N=4:1 to 999:1. The binder resin has a weight-average molecular weight (Mw) of from 3,000 to 50,000.

Developer carrying member for carrying developer, apparatus unit

A developer carrying member is comprised of a substrate and a coat layer which covers the surface of the substrate. The coat layer contains at least a binder resin, conductive spherical particles having a number average particle diameter of from 0.3 .mu.m to 30 .mu.m and a true density of 3 g/cm.sup.3 or below, and a nitrogen-containing heterocyclic compound, the particles and the compound being dispersed in the binder resin.

Developer carrying member, comprising a coat layer containing a

A developer carrying member includes a substrate, the surface of which is covered with a conducting layer. The conducting layer contains a binder resin and conducting spherical particles dispersed therein having a number average particle diameter of from 0.3 .mu.m to 30 .mu.m and a true density of 3 g/cm.sup.3 or below.

Developer carrying member, developing assembly, image forming apparatus,

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Tokyo, Japan

Michiko Orihara