Ricoh Company, Ltd.

Semiconductor Energy Laboratory Co., Ltd.

Hiroshi Ikuno

Tetsuro Suzuki

Hiroshi Tamura

Hidetoshi Kami

Kazukiyo Nagai

Yohta Sakon

Eiji Kurimoto

Nozomu Tamoto

Tatsuya Niimi

Yuuji Tanaka

Naohiro Toda

Yoshiki Yanagawa

Shunpei Yamazaki

Takeo Tsukamoto

Takashi Okada

Shinji Matsumoto

Chiaki Tanaka

Tamotsu Aruga

Akihiko Matsuyama

Daisuke Goto

Shigenori Hayashi

Tamotsu Horiuchi

Toshiya Sagisaka

Masafumi Torii

Tomoyuki Shimada

Hiroshi Nakai

Tsukuru Kai

Nobutaka Takeuchi

Masafumi Ohta

Hidetoshi Yano

Yasuo Suzuki

Nekka Matsuura

Narihito Kojima

Hiroshi Nagame

Kei Yasutomi

Satoshi Yamamoto

Hongguo Li

Yukio Fujiwara

Tetsuya Toshine

Takafumi Iwamoto

Tomoharu Asano

Kazuhiro Egawa

Yoshiaki Kawasaki

Keisuke Shimoyama

Katsuichi Ohta

Takahiko Tokumasu

Yasuhito Kuboshima

Takuji Kato

Takeshi Orito

Masataka Mohri

Toshihiro Ishida

Ryohichi Kitajima

Yuka Miyamoto

Akihiro Kotsugai

Toshihiko Baba

Kimitoshi Yamaguchi

Akihiro Sugino

Masahiko Shakuto

Masahiro Ohmori

Hirokatsu Suzuki

Jun Aoto

Masanobu Gondoh

Shinji Nohsho

Kaori Toyama

Shohei Gohda

Masao Yoshikawa

Mitsuaki Hirose

Kohichi Ohshima

Hideo Nakamori

Noboru Tsukude

Nobuya Mori

Hongguo Ll

Kazahiko Watanabe

An electrophotographic photoconductor, including: an electroconductive substrate; and at least a photoconductive layer and a surface layer in this order over the electroconductive substrate, wherein the surface layer includes a resin having no charge transport properties, and first inorganic fine particles, and wherein the first inorganic fine particles are inorganic fine particles having surfaces modified with at least one of a primary amino group and a secondary amino group, and a volume resistivity of the first inorganic fine particles is 1&#xd7;10&#x3a9;&#xb7;cm or less.

Electrophotographic photoconductor, image forming apparatus, and process cartridge

An image forming apparatus, which contains: an image bearing member; a charging unit; an exposing unit; a developing unit; a transferring unit; and a cleaning unit, wherein the image bearing member contains an electrically conductive support, a photoconductive layer formed on the electrically conductive support, and a surface layer containing a binder resin and particles formed on a surface of the photoconductive layer, or contains the electrically conductive support, and the photoconductive layer formed on the electrically conductive support, wherein the cleaning unit contains a cleaning blade, which contains a cured composition containing a curing agent in a region of the cleaning blade, which is to be in contact with the image bearing member, and wherein the curing agent contains a polycyclic aliphatic hydrocarbon group, and a (meth)acryloyloxy group.

Image forming apparatus and process cartridge including a cleaning blade which includes a cured composition

An electrophotographic photoreceptor, including an electroconductive substrate; a photosensitive layer overlying the electroconductive substrate; and a surface layer overlying the photosensitive layer, wherein the surface layer includes a resin having no charge transportability; and an inorganic particulate material, wherein the inorganic particulate material is a zinc oxide doped with a boron group, and wherein the electrophotographic photoreceptor has a surface specific resistivity (R1) not less than 10&#x3a9;/cmwhen the surface layer has an electric field intensity of 1&#xd7;10V/cm, and a ratio (R1/R15) of the surface specific resistivity (R1) to a surface specific resistivity (R15) when the surface layer has an electric field intensity of 1.5&#xd7;10V/cm of from 100 to 5,000.

Electrophotographic photoreceptor, image forming apparatus and process cartridge

An image forming apparatus including at least a photoreceptor; and a cleaning blade formed of a strip-shaped elastic blade to contact an edge line to the surface of the photoreceptor, wherein the photoreceptor includes a surface layer comprising a particulate material, and the edge line of the cleaning blade includes a substrate of the elastic blade; a mixed layer having a thickness not less than 1.0 &#x3bc;m, formed of the substrate and at least one of an acrylic resin and a methacrylic resin, located at the surface of the substrate; and a surface layer having a thickness not less than 0.1 &#x3bc;m, formed of at least one of an acrylic resin and a methacrylic resin, located on the surface of the substrate.

Image forming apparatus and process cartridge

A photoreceptor including an electroconductive substrate; a photosensitive layer which is located overlying the electroconductive substrate and which is not radically crosslinked; and an outermost layer which is located overlying the photosensitive layer and which includes a radically crosslinked material, wherein the radically crosslinked material includes a unit having a specific formula. An image forming method, an image forming apparatus, and a process cartridge, which use the photoreceptor.

Electrophotographic photoreceptor, and image forming method and apparatus using the same

An image bearing member having an electroconductive substrate, a photosensitive layer overlying the electroconductive layer, and a cross-linked surface layer overlying the photosensitive layer, which contains a cross-linked polymer and a first compound consisting essentially of a nitrogen atom and a phenyl group, biphenyl group, and condensed polycyclic hydrocarbon group, or a second compound consisting essentially of a nitrogen atom and hydrogen atoms, halogen atoms, alkyl groups, alkoxy groups, or aryl groups, substituted or non-substituted alkyl groups, substituted or non-substituted alkoxy groups, substituted or non-substituted aralkyl groups, substituted or non-substituted aryl group, substituted or non-substituted alkylene groups, cyano groups, nitro groups, or &#x2014;OCO&#x2550;CHR16, in which R16 represents a hydrogen atom, a substituted or non-substituted alkyl group, a substituted or non-substituted alkoxy group, or a substituted or non-substituted aryl group.

Image bearing member and image forming method, image forming apparatus, and process cartridge using the same

A photoreceptor including an electroconductive substrate; a photosensitive layer on the electroconductive substrate; and a protection layer on the photosensitive layer, wherein the protection layer includes a radical polymerizable compound having three or more radical polymerizable groups without a charge transportable group, a monofunctional radical polymerizable compound having a specific charge transportable group and a non-radical polymerizable compound having a specific charge transportable group.

Photoreceptor, process cartridge and image forming apparatus

An image forming apparatus having a rotary image bearing member, a charging device to charge the image bearing member. an irradiator to irradiate the image bearing member to form a latent electrostatic image thereon, a developing device to develop the latent electrostatic image with a developing agent containing toner to obtain a visible image, a transfer device to transfer the visible image to a recording medium, a first cleaner that slidably contacts the image bearing member to remove toner remaining thereon, a driving mechanism to drive the image bearing member at different linear speeds, a noise detector provided in the vicinity of the image bearing member to detect noise, and an abnormal noise predictor device to predict whether abnormal noise hear during image formation based on noise detected by the noise detector when the image bearing member is driven not during image formation at a linear speed different from that during image formation.

Image forming apparatus

A photoreceptor including an electroconductive substrate; a photosensitive layer located overlying the electroconductive substrate; and a crosslinked outermost layer located overlying the photosensitive layer and including a crosslinked material and a specific carbazole compound serving as a charge transport material. An image forming apparatus including the photoreceptor; a charger to charge the photoreceptor; an irradiator to irradiate the charged photoreceptor to form an electrostatic latent image thereon; a developing device to develop the electrostatic latent image with a developer including a toner to form a toner image on the photoreceptor; and a transferring device to transfer the toner image onto a recording material.

Electrophotographic photoreceptor, and image forming apparatus and process cartridge using same

A [1]benzothieno[3,2-b][1]benzothiophene compound expressed by General Formula (I): General Formula (I) where X and Y are each independently a hydrogen atom; a halogen atom; or a functional group having a straight or branched aliphatic alkyl group optionally having a halogen atom, a functional group having an alicyclic alkyl group optionally having a halogen atom, a functional group having a straight or branched aliphatic alkenyl group optionally having a halogen atom, a functional group having an alicyclic alkenyl group optionally having a halogen atom, a functional group having a carboxyl group, or a functional group having a thiol group, as a partial structure; and X and Y are the same or each independently different, provided that at least one of X and Y has a straight or branched aliphatic alkenyl group, an alicyclic alkenyl group, a carboxyl group or a thiol group, as a partial structure. 

[1]benzothieno[3,2-B][1]benzothiophene compound and method for producing the same, and organic electronic device using the same

A benzobisthiazole compound having a specific formula, and a benzobisthiazole polymer having a specific benzothiazole structure. An organic film including the benzobisthiazole polymer, the benzobisthiazole compound and/or a polymer obtained from the benzobisthiazole compound. An organic thin-film transistor including an organic semiconductor layer including the organic film; a pair of electrodes configured to flow an electric current through the organic semiconductor layer; and a third electrode configured to apply a voltage to the organic semiconductor layer.

Benzobisthiazole compound, benzobisthiazole polymer, organic film including the compound or polymer and transistor including the organic film

An image bearing member including an electroconductive substrate, a charge generating layer located overlying the electroconductive substrate, a charge transport layer located overlying the charge generating layer, the charge transport layer comprising a charge transport material and a protective layer having a thickness of from 3 to 15 &#x3bc;m located overlying the charge transport layer, wherein the density of the charge transport material in the protective layer at depth of 2 &#x3bc;m from the surface of the charge transport layer satisfies the following relationship:10(%)&#x2266;(Charge transport material)/{(Radical polymerizable monomer having a charge transport structure)+(Radical polymerizable monomer having no charge transport structure)+(Charge transport material)}&#xd7;100&#x2266;30(%).

Image bearing member, process cartridge, image forming apparatus and method of forming image bearing member

An electrophotographic photoreceptor, including an electroconductive substrate; a photosensitive layer, located overlying the electroconductive substrate; and a crosslinked resin surface layer, located overlying the photo sensitive layer, wherein the crosslinked resin surface layer includes a crosslinked body of trimethylolpropanetriacrylate, isocyanate including a radical polymerizable functional group and a heat or a light-curable charge transport material.

Electrophotographic photoreceptor, and process cartridge and image forming apparatus using the photoreceptor

An object of the present invention is to provide an electrophotographic photoconductor having an extremely low increase in friction coefficient and wear, while also having superior cleanability even after long-term or large-volume printing, and to provide an electrophotographic apparatus for forming an image using a polymerization toner without providing a unit for externally supplying a lubricant to a photoconductor. Namely, the present invention provides an electrophotographic photoconductor having a photosensitive layer and a crosslinked resin surface layer over a conductive substrate, wherein the crosslinked resin surface layer at least contains trimethylolpropane triacrylate, a dimethylpolysiloxane having a radically polymerizable functional group, and lubricating fine particles.

Electrophotographic photoconductor, electrophotographic process cartridge containing the same and electrophotographic apparatus containing the same

The present invention provides an electrophotographic photoconductor including, an uppermost crosslinked surface layer including a cured product of a crosslinked surface layer composition containing a tri- or more functional radical-polymerizable monomer having no charge transportable structure, organosilica sol, an isocyanate group-containing radical-polymerizable monomer, and a curable charge transport material.

Electrophotographic photoconductor, process cartridge, and image forming apparatus

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Yokohama, Japan

Hiroshi Ikuno