Ricoh Company, Ltd.

Sumitomo Bakelite Company Limited

Michio Kimura

Toshiyuki Kabata

Hideo Nakamori

Akihiro Sugino

Tomoyuki Shimada

Chiaki Tanaka

Nozomu Tamoto

Yoshiki Yanagawa

Takaaki Ikegami

Jun Aoto

Tetsuya Toshine

Hiromi Tada

Izumi Aiso

Shinji Nousyo

Yasuo Suzuki

Yasushi Nakazato

Shinichi Kawamura

Mitsuru Hashimoto

Masahide Yamashita

Masafumi Ohta

Eiji Kurimoto

Naohiro Toda

Jun Yamane

Yasuyuki Yamashita

Yoshiaki Kawasaki

Keisuke Shimoyama

Kohji Ue

Tomoharu Asano

Takeshi Takada

Toshio Fukagai

Katsuichi Ohta

Mikiko Imazeki

Hirofumi Yamanami

Kenji Seki

Satoshi Igari

Noriyuki Ohigashi

Haruo Murakami

Kazuya Ishida

Satomi Mochizuki

Junichiroh Hashimoto

An object of the present invention is to provide an epoxy resin composition that provides, when used for an insulation layer of a multilayer printed wiring board, a multilayer printed wiring board which is excellent in plating adhesion, heat resistance and moisture resistance reliability and capable of forming fine wiring. Another object of the present invention is to provide a resin sheet, a prepreg, a method for producing a multilayer printed wiring board, a multilayer printed wiring board and a semiconductor device. These objects are achieved by an epoxy resin composition comprising (A) an epoxy resin, (B) a phenoxy resin having a specific bisphenol acetophenone structure and (C) a curing agent, wherein the content of the phenoxy resin (B) is 10 to 30% by weight of the total solid content of the resin composition.

Epoxy resin composition, resin sheet, prepreg, multilayer printed wiring board and semiconductor device

An image forming apparatus having an image bearing member, a charger to charge the surface of the image bearing member, an irradiator to irradiate the image bearing member to form the latent image, a developing device to develop the latent electrostatic image with toner to obtain a visible image, a transfer device to transfer the visible image to a transfer medium by a transfer bias applied to a transfer area between the image bearing member and the transfer member, and a voltage detector to measure a first surface voltage and a second surface voltage under different conditions, and a life expectancy identification device to identify whether or when the expected working life of the image bearing member has come to the end based on a comparison of the first surface voltage and the second surface voltage.

Image forming apparatus

An image carrier deterioration degree evaluating apparatus for evaluating a degree of deterioration of an image carrier of an image forming apparatus, the image carrier deterioration degree evaluating apparatus including: an image deletion detecting unit that detects image deletion by obtaining latent image information written on the image carrier; an image deletion reducing unit that performs a process of reducing image deletion when the image deletion detecting unit detects image deletion, and an image carrier deterioration degree evaluating unit that drives the image deletion detecting unit and the image deletion reducing unit alternately one or more times each, and evaluates a degree of deterioration of the image carrier by using the latent image information obtained one or more times by the image deletion detecting unit.

Image carrier deterioration degree evaluating device, image carrier failure predicting device, and image forming apparatus

The present invention provides a resin composition which can produce a multilayer printed wiring board not causing peeling and crack in a thermal shock test such as a cooling/heating cycle, and having high heat resistance and low-thermal expansion characteristics, when the resin composition is used for an insulating layer of the multilayer printed wiring board; and also an insulating sheet provided on a base, a prepreg, a multilayer printed wiring board and a semiconductor device using thereof. The resin composition is used for forming an insulating layer of the multilayer printed wiring board, wherein a surface roughness parameter Rvk value of the insulating layer is from 0.1 &#x3bc;m to 0.8 &#x3bc;m, measured after the insulating layer being formed with the resin composition, and subject to roughening treatment.

Resin composition, insulating sheet with base, prepreg, multilayer printed wiring board and semiconductor device

An object of the present invention is to provide an image forming apparatus containing an electrophotographic photoconductor, a charging unit, an exposing unit, a developing unit, a transfer unit and a cleaning unit, 

Electrophotographic photoconductor, and image forming apparatus, process cartridge and image forming method using the same

A method for preparing a photoreceptor including forming a photosensitive layer overlying an electroconductive substrate; coating a liquid including a radically polymerizable compound to form a protective layer; irradiating the protective layer with light to crosslink the protective layer; and then contacting the protective layer with a fluid, which is selected from the group consisting of supercritical fluids and subcritical fluids and which includes a charge transport material. A photoreceptor prepared by the method. An image forming method, an image forming apparatus and a process cartridge using the photoreceptor.

Method for preparing photoreceptor, photoreceptor prepared by the method, and image forming method and apparatus and process cartridge using the photoreceptor

The present invention provides an electrophotographic photoconductor capable of reducing latent electrostatic image stability defects caused by adhesion/adsorption of an electric discharge product formed by a charger in an image forming process, degradation of charge transportability and cleaning defects caused when removing a residual toner. The electrophotographic photoconductor has a conductive substrate, and a photosensitive layer which contains at least a binder, a charge generating material and a charge transporting material and is formed on the substrate, wherein the photosensitive layer contains an injection material composed of at least any one of one wax selected from paraffin waxes, Fisher-Tropsh waxes, polyolefin waxes and a polyorganosiloxane compound in an area from the surface of the photosensitive layer to 50% of the thickness thereof in the thickness direction of the electrophotographic photoconductor, and the content of the injection material is 3% by mass or more to the content of the binder.

Electrophotographic photoconductor, method for producing the same, image forming process, image forming apparatus and process cartridge

An image forming apparatus includes a photoconductor, a cleaning blade for cleaning the photoconductor, and a blade holder holding the cleaning blade and having a first bent portion for increasing its rigidity. In the apparatus, blade holder has at least one of a protrusion and a second bent portion.

Image forming apparatus using a cleaning unit for preventing noises

Image forming apparatus using a cleaning member for preventing noises and process cartridge therefor

An endless belt including an endless body having opposite side edges and an interior surface, and a pair of spaced apart parallel guides bonded to the interior surface of the endless body at positions adjacent to the side edges thereof and extending longitudinally along the side edges, wherein each of the guides is made of an elastic material and has inside and/or outside surfaces having specific roughness.

Apparatus having endless belt with roughened guide

An electrophotographic copying apparatus is provided with a belt-shaped photoconductor comprising. A magnetic electroconductive support and a photoconductive layer are formed on the photoconduction. A magnetic cleaning member is positioned for cleaning the surface of the belt-shaped photoconductor.

Electrophotographic copying apparatus having photoconductor with

A repeatedly usable electrophotographic photoconductor comprising (a) an electroconductive support, (b) an undercoat layer containing therein at least one salt selected from the group consisting of carboxylates, amino carboxylates, phosphates, polyphosphates, phosphites, phosphate derivatives, borates, sulfates and sulfites, and (c) a photoconductive layer, which layers are successively overlaid on the electroconductive support.

Electrophotographic photoconductor layered element comprising salt

An electrophotographic photoconductor an electroconductive substrate, an intermediate layer comprising a charge generating azo pigment and a thermosetting resin, a charge generating layer and a charge transporting layer, which layers are successively overlaid on the electroconductive substrate, the charge generating azo pigment being any of the azo pigments (1) through (4): ##STR1##

Electrophotographic photoconductor

Growing community of inventors

Numazu, Japan

Michio Kimura