Canon Kabushiki Kaisha

Hidetoshi Hirano

Hideki Anayama

Masato Tanaka

Toshiyuki Yoshihara

Hideyuki Ainoya

Atsushi Fujii

Itaru Yamazaki

Kan Tanabe

Takakazu Tanaka

Wataru Kitamura

Mayumi Kimura

Kazue Asakura

Akira Yoshida

Harunobu Ogaki

Hirotoshi Uesugi

Tetsuro Fukui

Atsushi Okuda

Shinji Takagi

Masataka Kawahara

Tsutomu Nishida

Yuka Ishiduka

Ryuji Higashi

Kaname Watariguchi

Kimihiro Yoshimura

Daisuke Miura

Hajime Miyazaki

Kazushige Nakamura

Jumpei Kuno

Yukihiro Abe

Hirofumi Kumoi

Junpei Kuno

An electrophotographic photosensitive member includes a support and a photosensitive layer in this order. The photosensitive layer contains a chlorogallium phthalocyanine crystal obtained by mixing a hydroxygallium phthalocyanine crystal and an aqueous hydrochloric acid solution.

Electrophotographic photosensitive member, process cartridge and electrophotographic apparatus, and chlorogallium phthalocyanine crystal and method for producing the same

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

Provided is an electrophotographic photosensitive member in which friction memory does not easily occur, and a process cartridge and an electrophotographic apparatus which have the electrophotographic photosensitive member. The electrophotographic photosensitive member having a photosensitive layer has a surface layer having a plurality of depressed portions which are independent from one another, where the minor axis diameter of the depressed portions is Rpc and the depth indicating the distance between the innermost part of a depressed portion and the opening surface thereof is Rdv, the depressed portions have a ratio of depth to minor axis diameter (Rdv/Rpc) on a surface of the photosensitive member of 1.0 or less, and the photosensitive layer has a charge transporting material with an ionization potential of 4.5 eV or more and 5.3 eV or less.

Electrophotographic photosensitive member, process cartridge, and electrophotographic apparatus

In an electrophotographic photosensitive member having a support, and provided thereon a photosensitive layer, a surface layer of the electrophotographic photosensitive member contains an electrically insulating binder resin and a random-copolymer type high-molecular-weight charge-transporting material having two kinds of specific repeating structural units. Also disclosed are a process cartridge and an electrophotographic apparatus which have such an electrophotographic photosensitive member.

Electrophotographic photosensitive member, process cartridge and electrophotographic apparatus

An electrophotographic photosensitive member has a support and a photosensitive layer provided thereon. The photosensitive layer contains a carixarene compound having specific structure. Also disclosed are a process cartridge and an electrophotographic apparatus which have the electrophotographic photosensitive member.

An electrophotographic photosensitive member exhibiting a high sensitivity and a potential stability on repetitive use and capable of suppressing image defects, such as black spots in a reversal development scheme, is provided. The photosensitive member includes a support, and a phthalocyanine layer formed on the support and a novel phthalocyanine crystal, which comprises a phthalocyanine compound and a substituted or unsubstituted condensed polycyclic hydrocarbon compound.

Phthalocyanine crystal, production process therefor, and electrophotographic photosensitive member, process cartridge and apparatus using the crystal

Electrophotographic photosensitive member, and process cartridge and electrophotographic apparatus including the photosensitive member

An electrophotographic photosensitive member comprises a conductive support and a photosensitive layer which comprises a charge generation layer and a charge transport layer, characterized in that the charge generation layer contains a polycarbonate resin, and the electrophotographic photosensitive member is electrostatically charged by applying a direct current voltage to a charging member in contact with the surface of said electrophotographic photosensitive member.

Electrophotographic apparatus with DC contact charging and photosensitive layer with polycarbonate resin in charge generation layer

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):

The present invention includes an electrophotographic photosensitive member having a surface layer containing a polyphenylene resin, and a process cartridge and an electrophotographic apparatus both having the electrophotographic photosensitive member.

Electrophotographic photosensitive member, and process cartridge and electrophotographic apparatus provided with the electrophotographic member

An electrophotographic photosensitive member has a support and a photosensitive layer provided on the support. The photosensitive layer containing a polysilane compound which has a structural unit represented by the following Formula (1) and has as a terminal group of the polymer chain a group selected from the group consisting of hydroxy, alkoxy and aryloxy ##STR1## wherein R.sub.1 represents a hydrogen atom, an alkyl group or an aralkyl group; R.sub.2 represents an ethyl group, a cycloalkyl group, a vinyl group, or an alkyl group or unsaturated hydrocarbon group having 3 or more carbon atoms, whose carbon atom directly bonded to the phenyl group is a primary carbon atom or a secondary carbon atom.

Electrophotographic photosensitive member, and process cartridge and

An electrophotographic photosensitive member is constituted by at least a support, a photosensitive layer disposed on the support, and a protective layer disposed on the photosensitive layer. The protective layer comprises a cured product obtained from a condensation product between a silyl acrylate compound and colloidal silica. The protective layer is effective in providing the photosensitive member with improved potential stability against a change in environmental conditions and an excellent durability.

Electrophotographic photosensitive member and electrophotographic

A surface layer of a photosensitive layer contains a resin comprising a structural unit represented by the following general formula (1), and at least one compound of a triarylamine compound represented by the following general formula (2) and a styryl compound represented by the following general formula (3): ##STR1## wherein, X is --CR.sub.13 R.sub.14 --, substituted or unsubstituted cycloalkylidene, substituted or unsubstituted .alpha.,.omega.-alkylene, single bond, --O--, --S--, --SO-- or --SO.sub.2 --, wherein R.sub.13 and R.sub.14 are each hydrogen, trifluoromethyl, or substituted or unsubstituted alkyl or aryl, and R.sub.1 to R.sub.12 are each hydrogen, halogen, or substituted or unsubstituted alkyl or aryl; ##STR2## wherein Y is hydrogen, halogen, substituted or unsubstituted alkyl or alkoxy, or ##STR3## wherein R.sub.15 ' to R.sub.24 ' are each hydrogen, halogen, substituted or unsubstituted alkyl or alkoxy, R.sub.15 to R.sub.27 are each hydrogen, halogen, substituted or unsubstituted alkyl or alkoxy, and R.sub.28 and R.sub.29 are each hydrogen or substituted or unsubstituted alkyl, aralkyl or aryl; ##STR4## wherein Z is --CH.sub.2 CH.sub.2 -- or --CH.dbd.CH--, R.sub.30 and R.sub.31 are each substituted or unsubstituted alkyl, aralkyl, aryl or heterocyclic, R.sub.32 to R.sub.39 are each hydrogen, substituted or unsubstituted alkyl or alkoxy, and Ar is substituted or unsubstituted arylene or heterocyclic.

Growing community of inventors

Shizuoka-ken, Japan

Hidetoshi Hirano