Canon Kabushiki Kaisha

Hirotoshi Uesugi

Masato Tanaka

Daisuke Miura

Harunobu Ogaki

Masataka Kawahara

Takashi Anezaki

Kazushige Nakamura

Yukihiro Abe

Nobumichi Miki

Hirofumi Kumoi

Takeshi Murakami

Akira Yoshida

Atsushi Okuda

Hiroyuki Tomono

Kazumichi Sugiyama

Akihiro Maruyama

Hideki Anayama

Yota Ito

Itaru Yamazaki

Hidetoshi Hirano

Tatsuya Yamaai

Shoma Hinata

Akira Shimada

Shinji Takagi

Tsutomu Nishida

Kazunori Noguchi

Akio Maruyama

Toshihiro Kikuchi

Atsushi Ochi

Wataru Kitamura

Hiroki Uematsu

Takayuki Sumida

Yoichi Kawamorita

Takakazu Tanaka

Akio Koganei

Junpei Kuno

Kyoichi Teramoto

Takao Soma

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 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).

An electrophotographic photosensitive member having a surface layer which contains a silicon-containing compound in an amount of less than 0.6% by mass based on the whole solid content in the surface layer, where the silicon-containing compound in the surface layer has a siloxane moiety in an amount of 0.01% by mass or more, based on the whole solid content in the surface layer, and its surface has specific depressions. Also disclosed are a process cartridge and an electrophotographic apparatus which have the electrophotographic photosensitive member.

Electrophotographic photosensitive member, process cartridge, and electrophotographic apparatus

An electrophotographic photosensitive member having excellent electrophotographic properties while being prevented from the generation of blade turn-up, a method of manufacturing the electrophotographic photosensitive member, and a process cartridge and an electrophotographic apparatus each having the electrophotographic photosensitive member are provided. The surface layer of the electrophotographic photosensitive member contains a polymer having a specific repeating structural unit.

Electrophotographic photosensitive member, method of manufacturing 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

An electrophotographic photosensitive member is provided which has a photosensitive layer formed on a support. The electrophotographic photosensitive member has a surface layer containing a silicon-containing compound or a fluorine-containing compound. The surface layer has a plurality of depressed portions which are independent from one another, on the surface. When the major axis diameter of the depressed portion is represented by Rpc and the distance between the deepest part and the opening surface of the depressed portion is represented by Rdv, Rdv is 0.1&#x3bc; or more to 10.0 &#x3bc;m or less, and the ratio of the depth (Rdv) to the major axis diameter (Rpc), Rdv/Rpc, is more than 0.3 to 7.0 or less.

Electrophotographic photosensitive member, process cartridge and electrophotographic apparatus

An electrophotographic photosensitive member has a surface having a plurality of depressed portions, having a major-axis diameter Rpc of 0.1 to 10 &#x3bc;m, a minor-axis diameter Lpc of 0.1 to 10 &#x3bc;m and a deepest-part to opening distance Rdv of 0.1 to 10 &#x3bc;m. Where the surface is equally divided into 4 regions in the rotational direction, which are then equally divided into 25 regions in the direction falling at right angles with the rotational direction, to obtain 100-spot regions A in total, and, in each thereof, square regions B of 50 &#x3bc;m each per side one side of which is parallel to the rotational direction are provided and the regions B are each equally divided into 500 zones by straight lines parallel to the rotational direction, 400 to 499 lines among the straight lines pass through the depressed portions in each of the regions B.

An electrophotographic apparatus adopts a contact development system as a development system, which hardly causes toner fusion, and which hardly causes fogging in an output image; and a process cartridge is detachably attached to a main body of the electrophotographic apparatus. Specifically, provided are: an electrophotographic apparatus equipped with an electrophotographic photoreceptor having a surface layer containing a diorganopolysiloxane having a specific repeating structural unit; and a process cartridge that is detachably attached to a main body of the electrophotographic apparatus.

Electrophotographic apparatus and process cartridge

The present invention provides an electrophotographic photosensitive member capable of maintaining high transfer efficiency without causing large transfer current for a long-term use, obtaining an excellent image, and achieving those effects especially when being applied to a color electrophotographic apparatus. The invention also provides a process cartridge and an electrophotographic apparatus each having such a photosensitive member. The present invention includes an electrophotographic photosensitive member having a photosensitive layer on a support, a surface layer containing diorganopolysiloxane having specific repeating structure units &#x3b1; and &#x3b2;, and having a weight-average molecular weight of 1,000 to 1,000,000; in which a content of the diorganopolysiloxane in the surface layer is 0.01 to 20% by weight based on the entire weight of the surface layer (except in the case where the surface layer contains fluorine atom-containing resin particles).

Electrophotgraphic photosensitive member, process cartridge, and electrophotgraphic apparatus

A process for producing an electrophotographic photosensitive member which has a charge-generating layer and a charge-transporting layer on a substrate, has steps of applying a solution containing a charge-transporting material, binder resin, dimethoxymethane, and an aromatic hydrocarbon-based solvent having a boiling point of 130&deg; C. or higher, and drying the solution, to form the charge-transporting layer.

Process for producing electrophotographic photosensitive member and electrophotographic photosensitive member

The present invention provides an electrophotographic photosensitive member having a surface layer containing diorganopolysiloxane having, as substituents, a perfluoro group, and a group having a substituted or unsubstituted polystyrene chain, a closed terminal and a degree of polymerization of 3 or more. The present invention also provides a process cartridge having the electrophotographic photosensitive member, and an electrophotographic apparatus.

An electrophotographic photosensitive member is constituted by a support and a photosensitive layer disposed on the support. The electrophotographic photosensitive member has a surface layer comprising a polyester resin having a recurring unit represented by the following formula (1):

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Numazu, Japan

Hirotoshi Uesugi