Canon Kabushiki Kaisha

Hirofumi Kumoi

Masato Tanaka

Takashi Anezaki

Daisuke Miura

Takeshi Murakami

Kazumichi Sugiyama

Yota Ito

Masataka Kawahara

Akihiro Maruyama

Shoma Hinata

Hirotoshi Uesugi

Hiroyuki Tomono

Kazuhisa Shida

Masashi Nishi

Tatsuya Yamaai

Yuki Yamamoto

Masahiro Watanabe

Harunobu Ogaki

Shinji Takagi

Tsutomu Nishida

Taichi Sato

Kaname Watariguchi

Tomohito Taniguchi

Kazushige Nakamura

Jumpei Kuno

Hidetoshi Hirano

Atsushi Uematsu

Isao Kawata

Takehiko Aoyama

Yukihiro Abe

Yuto Ito

Noboru Miyagawa

Junpei Kuno

Kazuko Sakuma

An electrophotographic photosensitive member includes a substrate and a photosensitive layer containing a phthalocyanine pigment. The crystalline particles of the phthalocyanine pigment have a crystallite correlation length r and a particle size R of 400 nm or less, and a parameter k defined by r/R is in the range of 0.17 to 0.42.

Electrophotographic photosensitive member, process cartridge, electrophotographic apparatus, and phthalocyanine pigment

An electrophotographic photosensitive member has a support, a charge generation layer, and a charge transport layer in this order, the charge transport layer containing a charge transport material. The charge transport layer is a surface layer of the electrophotographic photosensitive member and contains a polycarbonate resin having a structural unit selected from group A and a structural unit selected from group B.  

Electrophotographic photosensitive member, method for manufacturing electrophotographic photosensitive member, process cartridge, and electrophotographic apparatus

An electrophotographic photosensitive member includes a hole transporting layer containing a polyester resin having a structural unit expressed by formula (1) as a hole transporting substance.

Electrophotographic photosensitive member, process cartridge, and electrophotographic apparatus

An electrophotographic photosensitive member has a support, a charge generation layer, and a charge transport layer in this order, the charge transport layer containing a charge transport material. The charge transport layer is a surface layer of the electrophotographic photosensitive member and contains a polycarbonate resin having a structural unit selected from group A and a structural unit selected from group B (groups A and B defined in the disclosure).

A charge transporting layer of an electrophotographic photosensitive member contains a polysiloxane resin having a terminal structure represented by the formula (1), at least one selected from the group consisting of a polycarbonate resin A having a structural unit represented by the formula (A) and a polyarylate resin B having a structural unit represented by the formula (B), and a charge transporting substance, wherein the content of the siloxane structure in the polysiloxane resin is not less than 0.5% by mass and not more than 10% by mass based on the total mass of whole resin in the charge transporting layer.

Provided an electrophotographic image forming apparatus comprising an electrophotographic photosensitive member and a charging member. The electrophotographic photosensitive member includes a charge transport layer as a surface layer having a matrix-domain structure including specific resins. The charging member comprises an electro-conductive substrate, and an electro-conductive elastic layer. The electro-conductive elastic layer comprises a binder, and holding a bowl-shaped resin particle having an opening, so that at least a part of the bowl-shaped resin particle is exposed, and the charging member has a concavity derived from the opening of the bowl-shaped resin particle on the surface thereof, and a protrusion derived from an edge of the opening of the bowl-shaped resin particle on the surface thereof.

Electrophotographic image forming apparatus having charge transport layer with matrix-domain structure and charging member having concavity and protrusion

A surface layer of an electrophotographic photosensitive member contains (&#x3b1;) a particular siloxane-modified resin, (&#x3b2;) a particular compound, and a charge transporting substance. (&#x3b2;) is at least one compound selected from the group consisting of hexanol, heptanol, cyclohexanol, benzyl alcohol, ethylene glycol, 1,4-butanediol, 1,5-pentanediol, diethylene glycol, diethylene glycol ethyl methyl ether, ethylene carbonate, propylene carbonate, nitrobenzene, pyrrolidone, N-methylpyrrolidone, methyl benzoate, ethyl benzoate, benzyl acetate, ethyl 3-ethoxypropionate, acetophenone, methyl salicylate, dimethyl phthalate, and sulfolane.

The charge transporting layer as the surface layer of an electrophotographic photosensitive member includes a charge transporting substances represented by any one of formulae (1) to (5), a specific compound, and a specific resin (binder resin). The specific compound is hexanol, heptanol, cyclohexanol, benzyl alcohol, ethylene glycol, 1,4-butanediol, 1,5-pentanediol, diethylene glycol, diethylene glycol ethyl methyl ether, ethylene carbonate, propylene carbonate, nitrobenzene, pyrrolidone, N-methylpyrrolidone, methyl benzoate, ethyl benzoate, benzyl acetate, ethyl 3-ethoxypropionate, acetophenone, methyl salicylate, dimethyl phthalate, or sulfolane.

Electrophotographic photosensitive member, process cartridge and electrophotographic apparatus

In an electrophotographic photosensitive member having a support, a conductive layer formed on the support, an intermediate layer formed on the conductive layer, and a photosensitive layer formed on the intermediate layer, the conductive layer has been formed by using a conductive layer coating fluid which contains TiOparticles coated with oxygen deficient SnOhaving an average particle diameter of from 0.20 &#x3bc;m or more to 0.60 &#x3bc;m or less, and has a volume resistivity of from more than 8.0&#xd7;10&#x3a9;cm to 1.0&#xd7;10&#x3a9;cm or less. The electrophotographic photosensitive member can keep charging lines from occurring.

Electrophotographic photosensitive member, process cartridge and electrophotographic apparatus, and process for producing electrophotographic photosensitive member

Growing community of inventors

Suntou-gun, Japan

Hirofumi Kumoi