Patents by Inventor Kazuhiro Koseki
Kazuhiro Koseki has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20110293926Abstract: A lead frame for optical semiconductor devices in which a layer 2 composed of silver or a silver alloy is formed on an electrically-conductive substrate 1, having: a surface layer 4 composed of a metal or alloy thereof excellent in corrosion resistance as an outermost layer, wherein a concentration of a metallic component excellent in corrosion resistance of the surface layer is 50% by mass or more at the uppermost portion of the surface layer, and wherein a solid-solution layer 3 of silver and a metallic material which is a main component of the surface layer is formed between the surface layer and the layer composed of silver or a silver alloy.Type: ApplicationFiled: June 24, 2011Publication date: December 1, 2011Applicant: FURUKAWA ELECTRIC CO., LTD.Inventors: Yoshiaki KOBAYASHI, Kazuhiro KOSEKI, Shin KIKUCHI
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Publication number: 20110217640Abstract: An electrophotographic photoconductor includes a base, an undercoat layer that contains a metal oxide and an electron-accepting material and has a thickness of about 3 ?m or more and about 15 ?m or less, and a photosensitive layer containing a polymer having a repeating unit represented by general formula (1) where R1 and R2 each independently represent a halogen atom, an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 5 to 7 carbon atoms, or an aryl group having 6 to 12 carbon atoms; and m and n each independently represent an integer of 0 to 4.Type: ApplicationFiled: August 18, 2010Publication date: September 8, 2011Applicant: FUJI XEROX CO., LTD.Inventors: Shigeto Hashiba, Kazuhiro Koseki, Satoya Sugiura, Kenta Ide, Fuyuki Kano
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Publication number: 20100196810Abstract: An electrophotographic photoreceptor, includes: a conductive support; and a photosensitive layer provided on or above the conductive support, the photosensitive layer including an outermost surface layer at the farthest location from the conductive support, wherein the outermost surface layer contains: coated insulating inorganic particles obtained by subjecting insulating inorganic particles having a specific surface area of not more than about 300 m2/g to a coating treatment with an aromatic functional group-containing compound; and fluorine-containing organic particles.Type: ApplicationFiled: October 20, 2009Publication date: August 5, 2010Applicant: FUJI XEROX CO., LTD.Inventors: Shigeto HASHIBA, Kazuhiro KOSEKI, Kaori IEMURA, Kenta IDE, Satoya SUGIURA, Fuyuki KANO, Kazuyuki NAKAMURA
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Patent number: 7473503Abstract: An electrophotographic photoreceptor comprising: a conductive support; and a photo-sensitive layer on the conductive support, wherein the photo-sensitive layer comprises a functional layer comprising a cured product of a curable resin composition, the curable resin composition comprising an alcohol-soluble, curable resin and a polyether-modified silicone oil.Type: GrantFiled: September 28, 2005Date of Patent: January 6, 2009Assignee: Fuji Xerox Co., Ltd.Inventors: Wataru Yamada, Katsumi Nukada, Masahiro Iwasaki, Kenji Yao, Kazuhiro Koseki
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Publication number: 20090004583Abstract: According to the invention, there is provided an electrophotographic photoreceptor comprising a conductive substrate and a photosensitive layer provided on a surface of the conductive substrate, an outermost layer of the photosensitive layer containing a crosslinked product composed of a guanamine compound and at least one charge transporting material having at least one substituent selected from the group consisting of —OH, —OCH3, —NH2, —SH, and —COOH.Type: ApplicationFiled: March 17, 2008Publication date: January 1, 2009Applicant: FUJI XEROX CO., LTD.Inventors: Katsumi NUKADA, Wataru YAMADA, Masahiro IWASAKI, Kazuhiro KOSEKI
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Publication number: 20080220356Abstract: An electrophotographic photoreceptor including a photosensitive layer provided including a first functional layer including a compound represented by the following Formula (I). In Formula (I), F represents an n-valent organic group having hole transportation ability; R1, R2, and R3 each independently represents a hydrogen atom, a halogen atom, or a monovalent organic group; L represents a divalent organic group; n represents an integer of 1 to 4; and j represents an integer of 0 or 1.Type: ApplicationFiled: September 28, 2007Publication date: September 11, 2008Applicant: FUJI XEROX CO., LTD.Inventors: Wataru Yamada, Katsumi Nukada, Masahiro Iwasaki, Kazuhiro Koseki
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Patent number: 7420723Abstract: An optical deflector, a method of producing the optical deflector, an optical scanning device, and an image forming apparatus are disclosed that are able to save resources, provide high reliability at low cost, and enable stacked and relatively-offset polygon mirrors to be arranged precisely. The optical deflector includes a rotary member supported by a bearing with plural polygon mirrors fixed thereon. The polygon mirrors are stacked along a rotation axis of the rotary member, the polygon mirrors are relatively offset by a predetermined angle in a rotation plane of the rotary member, and an effective deflection area of each of the reflection surfaces of any one of the polygon mirrors is positioned away from a center of the corresponding reflection surfaces of the other one of the polygon mirrors in the direction of the rotation axis.Type: GrantFiled: December 26, 2006Date of Patent: September 2, 2008Assignees: Ricoh Company, Ltd., Tohoku Ricoh Co., Ltd.Inventors: Yukio Itami, Kazuhiro Koseki, Makoto Endo, Yoshihiro Takahashi, Tomotaka Takamura, Noriyuki Kadowaki, Takeshi Kikuchi, Hidetoshi Kojima, Takao Abe, Masao Hatayama
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Publication number: 20070153349Abstract: An optical deflector, a method of producing the optical deflector, an optical scanning device, and an image forming apparatus are disclosed that are able to save resources, provide high reliability at low cost, and enable stacked and relatively-offset polygon mirrors to be arranged precisely. The optical deflector includes a rotary member supported by a bearing with plural polygon mirrors fixed thereon. The polygon mirrors are stacked along a rotation axis of the rotary member, the polygon mirrors are relatively offset by a predetermined angle in a rotation plane of the rotary member, and an effective deflection area of each of the reflection surfaces of any one of the polygon mirrors is positioned away from a center of the corresponding reflection surfaces of the other one of the polygon mirrors in the direction of the rotation axis.Type: ApplicationFiled: December 26, 2006Publication date: July 5, 2007Inventors: Yukio Itami, Kazuhiro Koseki, Makoto Endo, Yoshihiro Takahashi, Tomotaka Takamura, Noriyuki Kadowaki, Takeshi Kikuchi, Hidetoshi Kojima, Takao Abe, Masao Hatayama
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Publication number: 20060292465Abstract: A curable resin composition for use as a constituent material of an electrophotographic photoreceptor, the curable resin composition comprising: a phenolic resin having an (MwH/MwL) value of approximately 1.90 or less in a molecular weight distribution measured by gel permeation chromatography, wherein MwH is a peak area for a weight average molecular weight of approximately 200 or more; and MwL is a peak area for a weight average molecular weight of less than approximately 200.Type: ApplicationFiled: December 14, 2005Publication date: December 28, 2006Applicant: FUJI XEROX CO., LTD.Inventors: Wataru Yamada, Katsumi Nukada, Masahiro Iwasaki, Kazuhiro Koseki
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Publication number: 20060292464Abstract: An electrophotographic photoreceptor comprising: a conductive support; and a photo-sensitive layer on the conductive support, wherein the photo-sensitive layer comprises a functional layer comprising a cured product of a curable resin composition, the curable resin composition comprising an alcohol-soluble, curable resin and a polyether-modified silicone oil.Type: ApplicationFiled: September 28, 2005Publication date: December 28, 2006Applicant: FUJI XEROX CO., LTD.Inventors: Wataru Yamada, Katsumi Nukada, Masahiro Iwasaki, Kenji Yao, Kazuhiro Koseki
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Patent number: 7105257Abstract: An electrophotographic photoreceptor comprising a conductive support and a photosensitive layer disposed on the conductive support, wherein the photosensitive layer comprises a silicon compound-containing layer containing a silicon compound, and the silicon compound-containing layer further contains a resin, and wherein the photosensitive layer has a peak area in the region of ?40 to 0 ppm (S1) and a peak area in the region of ?100 to ?50 ppm (S2) in a 29Si-NMR spectrum satisfying the following equation (1): S1/(S1+S2)?0.5.Type: GrantFiled: August 27, 2003Date of Patent: September 12, 2006Assignee: Fuji Xerox Co., Ltd.Inventors: Wataru Yamada, Katsumi Nukada, Kazuhiro Koseki, Takayuki Yamashita, Masahiro Iwasaki, Takahiro Suzuki
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Patent number: 7094511Abstract: The present invention relates to an electrophotographic photoreceptor comprising a conductive support having formed thereon a specific photosensitive layer. The photosensitive layer comprises a siloxane resin-containing layer containing a siloxane resin having a structural unit represented by general formula (1) shown below, a structural unit represented by general formula (2) shown below, and an organic group derived from a compound having hole transport capability, or comprises a siloxane resin-containing layer containing a siloxane resin obtained by using an organic silicon compound having a structural unit represented by general formula (1) shown below and a hydrolytic group, and a compound represented by general formula (3) shown below: The formulas are defined in the specification.Type: GrantFiled: September 25, 2003Date of Patent: August 22, 2006Assignee: Fuji Xerox Co., Ltd.Inventors: Wataru Yamada, Katsumi Nukada, Kazuhiro Koseki, Masahiro Iwasaki, Takayuki Yamashita
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Patent number: 7074540Abstract: An image forming apparatus is capable of performing image formation at a processing speed of not lower than 150 mm/s. An electrophotographic photoreceptor comprises a surface layer containing a siloxane-bases resin having charge-transporting properties and a crosslinked structure. A cleaning device comprises a brush member disposed such that the leading end of said brush comes in contact with said electrophotographic photoreceptor. The product (Rz×We) of the surface roughness (Rz [?m]) of said electrophotographic photoreceptor after 200,000 rotations thereof and the wear rate of said electrophotographic photoreceptor per 1,000 rotations (We [nm]) is not greater than 20.Type: GrantFiled: November 1, 2004Date of Patent: July 11, 2006Assignee: Fuji Xerox Co., Ltd.Inventors: Katsumi Nukada, Kazuhiro Koseki, Wataru Yamada, Takayuki Yamashita, Masahiro Iwasaki, Takahiro Suzuki, Kiyoshi Chatani, Yoshinari Ueno, Hidekazu Yaguchi, Kazuhiko Yanagida
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Patent number: 6936387Abstract: An electrophotographic photoreceptor that can sufficiently prevent occurrence of filming, whereby defects on an image can be sufficiently prevented, and an electrophotographic process cartridge and an electrophotographic apparatus using the electrophotographic photoreceptor are to be provided. The electrophotographic photoreceptor contains an electroconductive substrate having provided thereon a photosensitive layer, and an outermost layer of the photosensitive layer has a dynamic hardness of about from 13.0×109 to 100.0×109 N/m2. According to the invention, occurrence of flaws on the surface of the photoreceptor can be sufficiently prevented, and cracking of a member made in contact with the photoreceptor can also be sufficiently prevented. Therefore, occurrence of filming is sufficiently prevented, and occurrence of defects on an image is also sufficiently prevented.Type: GrantFiled: December 13, 2001Date of Patent: August 30, 2005Assignee: Fuji Xerox Co., Ltd.Inventors: Kenji Yao, Wataru Yamada, Kazuhiro Koseki, Katsumi Nukada
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Patent number: 6933088Abstract: Provided are a photoreceptor of an electophotographic system satisfactorily high in resistance to contamination with a developer or corona products and durability to a contact electrification unit or a cleaning blade and capable of preventing occurrence of film defects in the production, and a process cartridge and an image forming apparatus in which a good image quality can be obtained over a long period of time. The photoreceptor includes a conductive substrate and a silicon compound-containing layer located on the substrate and containing a cyclic siloxane compound and/or derivatives thereof. The cyclic siloxane compound has a cyclic structure containing a repeating unit represented by formula (1) wherein A1 and A2, which may be the same or different, each represent a monovalent organic group.Type: GrantFiled: April 17, 2003Date of Patent: August 23, 2005Assignee: Fuji Xerox Co., Ltd.Inventors: Wataru Yamada, Kazuhiro Koseki, Katsumi Nukada
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Publication number: 20050089788Abstract: An image forming apparatus is capable of performing image formation at a processing speed of not lower than 150 mm/s. An electrophotographic photoreceptor comprises a surface layer containing a siloxane-bases resin having charge-transporting properties and a crosslinked structure. A cleaning device comprises a brush member disposed such that the leading end of said brush comes in contact with said electrophotographic photoreceptor. The product (Rz×We) of the surface roughness (Rz [?m]) of said electrophotographic photoreceptor after 200,000 rotations thereof and the wear rate of said electrophotographic photoreceptor per 1,000 rotations (We [nm]) is not greater than 20.Type: ApplicationFiled: November 1, 2004Publication date: April 28, 2005Applicant: Fuji Xerox Co., Ltd.Inventors: Katsumi Nukada, Kazuhiro Koseki, Wataru Yamada, Takayuki Yamashita, Masahiro Iwasaki, Takahiro Suzuki, Kiyoshi Chatani, Yoshinari Ueno, Hidekazu Yaguchi, Kazuhiko Yanagida
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Patent number: 6876371Abstract: The invention provides an image forming apparatus comprising at least: an electrophotographic photoreceptor comprising at least a conductive substrate and a photosensitive layer provided on the conductive substrate; a charging device; an exposure device; a developing device; and a transfer device, wherein the exposure device is of a multi beam exposure system which has a surface emitting laser array having two or more light-emitting elements as an exposure light source and which scan the electrophotographic photoreceptor with plural light beams thereby forming electrostatic latent image, and wherein the outermost layer in the electrophotographic photoreceptor, positioned most distant from the conductive substrate, contains a silicon-containing resin containing at least a charge transporting compound or a characteristic group derived from a charge transporting compound, and having a structure in which bonds formed by crosslinking of an O atom with neighboring Si atoms are formed three dimensionally.Type: GrantFiled: October 14, 2003Date of Patent: April 5, 2005Assignee: Fuji Xerox Co., Ltd.Inventors: Takahiro Suzuki, Taketoshi Hoshizaki, Katsumi Nukada, Mitsuhide Nakamura, Kazuhiro Koseki, Takayuki Yamashita, Wataru Yamada, Koji Bando
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Patent number: 6835520Abstract: An apparatus for forming an image is provided that can sufficiently prevent occurrence of nibbled images without any damage of the photoreceptor and the intermediate transfer body, whereby good image quality can be stably obtained for a long period of time. In an apparatus for forming an image having an intermediate transfer body, the surface of the photoreceptor has a dynamic hardness of 8×109 N/m2 or more, and the surface of the intermediate transfer body has a dynamic hardness larger than that of the surface of the photoreceptor, and a difference between the dynamic hardness of the surface of the photoreceptor and the dynamic hardness of the surface of the intermediate transfer material is 2×1010 N/m2 or less.Type: GrantFiled: November 8, 2002Date of Patent: December 28, 2004Assignee: Fuji Xerox Co., Ltd.Inventors: Koji Bando, Masahiko Hodumi, Takahiro Suzuki, Kazuhiro Koseki
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Publication number: 20040197690Abstract: The present invention relates to an electrophotographic photoreceptor comprising a conductive support having formed thereon a specific photosensitive layer.Type: ApplicationFiled: September 25, 2003Publication date: October 7, 2004Applicant: FUJI XEROX CO., LTD.Inventors: Wataru Yamada, Katsumi Nukada, Kazuhiro Koseki, Masahiro Iwasaki, Takayuki Yamashita
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Publication number: 20040183883Abstract: The invention provides an image forming apparatus comprising at least: an electrophotographic photoreceptor comprising at least a conductive substrate and a photosensitive layer provided on the conductive substrate; a charging device; an exposure device; a developing device; and a transfer device, wherein the exposure device is of a multi beam exposure system which has a surface emitting laser array having two or more light-emitting elements as an exposure light source and which scan the electrophotographic photoreceptor with plural light beams thereby forming electrostatic latent image, and wherein the outermost layer in the electrophotographic photoreceptor, positioned most distant from the conductive substrate, contains a silicon-containing resin containing at least a charge transporting compound or a characteristic group derived from a charge transporting compound, and having a structure in which bonds formed by crosslinking of an O atom with neighboring Si atoms are formed three dimensionally.Type: ApplicationFiled: October 14, 2003Publication date: September 23, 2004Applicant: FUJI XEROX CO., LTD.Inventors: Takahiro Suzuki, Taketoshi Hoshizaki, Katsumi Nukada, Mitsuhide Nakamura, Kazuhiro Koseki, Takayuki Yamashita, Wataru Yamada, Koji Bando