Patents by Inventor Hidemi Nukada
Hidemi Nukada 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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Patent number: 9720343Abstract: A conductive member includes a substrate, an elastic layer formed on the substrate, and a surface layer formed on the elastic layer, wherein the surface layer has a sea-island structure that includes a sea portion at least containing a first resin and a conductive agent and island portions at least containing a second resin, the island portions have an average diameter of approximately at least 100 nm and not greater than 1/10 of the thickness of the surface layer, and the conductive agent contained in the sea portion is unevenly distributed in the vicinity of the interface of the sea portion with the island portions.Type: GrantFiled: March 4, 2016Date of Patent: August 1, 2017Assignee: FUJI XEROX CO., LTD.Inventors: Yukiko Kamijo, Taketoshi Hoshizaki, Hidemi Nukada
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Publication number: 20170003616Abstract: A conductive member includes a substrate, an elastic layer formed on the substrate, and a surface layer formed on the elastic layer, wherein the surface layer has a sea-island structure that includes a sea portion at least containing a first resin and a conductive agent and island portions at least containing a second resin, the island portions have an average diameter of approximately at least 100 nm and not greater than 1/10 of the thickness of the surface layer, and the conductive agent contained in the sea portion is unevenly distributed in the vicinity of the interface of the sea portion with the island portions.Type: ApplicationFiled: March 4, 2016Publication date: January 5, 2017Applicant: FUJI XEROX CO., LTD.Inventors: Yukiko KAMIJO, Taketoshi HOSHIZAKI, Hidemi NUKADA
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Patent number: 9291923Abstract: An electrophotographic photoreceptor includes a cylindrical conductive substrate, an undercoat layer containing a cured product of a resin and a blocked isocyanate and being disposed on the conductive substrate, and a photosensitive layer on the undercoat layer. The degree of curing of the undercoat layer defined by the equation below is about 1.5 or less in both a region A and a region B defined below: Region A (B): A region between a position distant from a first (second) end of the conductive substrate by about ? of a length of the conductive substrate and a position distant from the first (second) end of the conductive substrate by about ? of the length of the conductive substrate Degree of curing=[Amount (g) of blocking agent separated from blocked isocyanate in undercoat layer]/weight of undercoat layer (g)×100.Type: GrantFiled: September 8, 2014Date of Patent: March 22, 2016Assignee: FUJI XEROX CO., LTD.Inventors: Hidemi Nukada, Shigeto Hashiba
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Publication number: 20150268569Abstract: An electrophotographic photoreceptor includes a cylindrical conductive substrate, an undercoat layer containing a cured product of a resin and a blocked isocyanate and being disposed on the conductive substrate, and a photosensitive layer on the undercoat layer. The degree of curing of the undercoat layer defined by the equation below is about 1.5 or less in both a region A and a region B defined below: Region A (B): A region between a position distant from a first (second) end of the conductive substrate by about ? of a length of the conductive substrate and a position distant from the first (second) end of the conductive substrate by about ? of the length of the conductive substrate Degree of curing=[Amount (g) of blocking agent separated from blocked isocyanate in undercoat layer]/weight of undercoat layer (g)×100.Type: ApplicationFiled: September 8, 2014Publication date: September 24, 2015Applicant: FUJI XEROX CO., LTD.Inventors: Hidemi NUKADA, Shigeto HASHIBA
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Patent number: 9098007Abstract: A charging member includes a conductive elastic layer, and a conductive surface layer that is disposed on the conductive elastic layer, is in contact with an image holding member, and contains a resin, porous resin particles, and silicone oil, wherein a content of the porous resin particles is from 3 parts by weight to 25 parts by weight based on 100 parts by weight of the resin, and a content of the silicone oil is from 0.1 part by weight to 10 parts by weight based on 100 parts by weight of the resin.Type: GrantFiled: April 22, 2014Date of Patent: August 4, 2015Assignee: FUJI XEROX CO., LTD.Inventors: Minoru Rokutan, Hidemi Nukada, Satoya Sugiura, Akihiro Nonaka, Takuro Hagiwara, Minoru Oshima
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Publication number: 20150125183Abstract: A charging member includes a conductive elastic layer, and a conductive surface layer that is disposed on the conductive elastic layer, is in contact with an image holding member, and contains a resin, porous resin particles, and silicone oil, wherein a content of the porous resin particles is from 3 parts by weight to 25 parts by weight based on 100 parts by weight of the resin, and a content of the silicone oil is from 0.1 part by weight to 10 parts by weight based on 100 parts by weight of the resin.Type: ApplicationFiled: April 22, 2014Publication date: May 7, 2015Applicant: FUJI XEROX CO., LTD.Inventors: Minoru ROKUTAN, Hidemi NUKADA, Satoya SUGIURA, Akihiro NONAKA, Takuro HAGIWARA, Minoru OSHIMA
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Patent number: 8802338Abstract: The present invention provides an electrophotographic photoreceptor that includes: at least a photosensitive layer on a conductive support; a surface layer that contains fluororesin particles and a fluorocarbon comb graft polymer containing a repeating unit derived from a macromonomer and a repeating unit derived from a monomer having a fluoroalkyl group having 1 to 8 carbon atoms; wherein the surface layer contains phosphorus in an amount of about 5 ppm or less, and a process cartridge and electrophotographic apparatus, which use the photoreceptor.Type: GrantFiled: September 10, 2009Date of Patent: August 12, 2014Assignee: Fuji Xerox Co., Ltd.Inventors: Hidemi Nukada, Takahiro Suzuki
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Patent number: 8802337Abstract: An electrophotographic photoreceptor includes a support; an undercoat layer which is provided on the support and contains at least a binder resin, metal oxide particles, and an electron-accepting compound having an anthraquinone structure, in which a content of the electron-accepting compound is from 0.5% by weight to 1.5% by weight with respect to the metal oxide particles and a contact angle of the metal oxide particles with respect to water is from 7° to 12°; and a photosensitive layer which is provided on the undercoat layer.Type: GrantFiled: November 8, 2012Date of Patent: August 12, 2014Assignee: Fuji Xerox Co., Ltd.Inventors: Akihiro Kawasaki, Shigeto Hashiba, Hirofumi Nakamura, Hidemi Nukada, Satoya Sugiura
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Publication number: 20130316275Abstract: An electrophotographic photoreceptor includes a support; an undercoat layer which is provided on the support and contains at least a binder resin, metal oxide particles, and an electron-accepting compound having an anthraquinone structure, in which a content of the electron-accepting compound is from 0.5% by weight to 1.5% by weight with respect to the metal oxide particles and a contact angle of the metal oxide particles with respect to water is from 7° to 12°; and a photosensitive layer which is provided on the undercoat layer.Type: ApplicationFiled: November 8, 2012Publication date: November 28, 2013Applicant: FUJI XEROX CO., LTD.Inventors: Akihiro KAWASAKI, Shigeto HASHIBA, Hirofumi NAKAMURA, Hidemi NUKADA, Satoya SUGIURA
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Patent number: 8524432Abstract: An electrophotographic photoreceptor includes a conductive substrate, and at least a photosensitive layer on the conductive substrate, a layer located at a surface of the photosensitive layer side of the electrophotographic photoreceptor contains fluorine containing resin particles and a fluoro graft polymer having a fluoroalkyl group having 1 to 7 carbon atoms, and an area for a polystyrene equivalent molecular weight of 700,000 or more is from about 5% to about 20% of the total area in a gel permeation chromatography (GPC) chart for the fluoro graft polymer.Type: GrantFiled: September 29, 2009Date of Patent: September 3, 2013Assignee: Fuji Xerox Co., Ltd.Inventors: Hidemi Nukada, Masaru Miura, Shinya Yamamoto, Isamu Ishiko, Tetsuya Ezumi
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Patent number: 8361686Abstract: An electrophotographic photoreceptor comprising at least a photosensitive layer on an electroconductive substrate, a surface layer of the electrophotographic photoreceptor including a fluorinated alkyl group-containing copolymer having repeating units represented by the following formulae A and B, and fluorine-based resin particles: wherein in Formulae A and B, l, m and n each independently represent a integer number of 1 or more; p, q, r and s each independently represent 0 or an integer of 1 or more; t represents an integer of from 1 to 7; R1, R2, R3, and R4 each independently represent a hydrogen atom or an alkyl group; X represents an alkylene chain, a halogen-substituted alkylene chain, —S—, —O—, —NH— or a single bond; Y represents an alkylene chain, a halogen-substituted alkylene chain, —(CzH2z-1(OH))— or a single bond; and z represents an integer of 1 or more.Type: GrantFiled: October 7, 2008Date of Patent: January 29, 2013Assignee: Fuji Xerox Co., Ltd.Inventors: Hidemi Nukada, Shinya Yamamoto, Masaru Miura, Hitoshi Takimoto, Takahiro Suzuki, Tetsunao Koujiri
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Patent number: 8263299Abstract: An electrophotographic photoreceptor comprises: an electroconductive support; and a photosensitive layer on the electroconductive support, wherein the photosensitive layer having a dynamic hardness of from 20×109 to 150×109 N/m2 and an elastic deformation ratio of from 15 to 80%.Type: GrantFiled: February 17, 2006Date of Patent: September 11, 2012Assignee: Fuji Xerox Co., Ltd.Inventors: Kaori Iemura, Katsumi Nukada, Hidemi Nukada, Kazuyuki Nakamura
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Patent number: 8103191Abstract: The invention provides an image forming apparatus having: an image holding member; a charging unit; a latent image-forming unit; a development unit; a measuring unit; and a control unit. The image holding member has a substrate having a surface having regular reflectance in a range of about 30% to about 95% with respect to light having a first wavelength and a subbing layer having a light transmittance of about 50% or greater per unit thickness of the layer with respect to light having the first wavelength and a photosensitive layer having absorption with respect to light having a second wavelength that is different from the first wavelength.Type: GrantFiled: March 20, 2008Date of Patent: January 24, 2012Assignee: Fuji Xerox Co., Ltd.Inventors: Hidemi Nukada, Takahiro Suzuki, Isamu Ishiko
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Patent number: 8021810Abstract: An image carrier includes a conductive base material and a photosensitive layer formed on the base material. The photosensitive layer has an outermost surface layer that contains particles having a number-averaged particle sphericality represented by Formula (1) of approximately 0.7 or less: sphericality=4?A/L2 (1), where ? represents the circular constant, A represents the projection area of the particle, and L represents the peripheral length of the projected particle image.Type: GrantFiled: October 23, 2007Date of Patent: September 20, 2011Assignee: Fuji Xerox Co., Ltd.Inventors: Hitoshi Takimoto, Kenta Ide, Toru Asahi, Hidemi Nukada, Takahiro Suzuki, Koji Bando
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Publication number: 20110171570Abstract: The invention provides an electrophotographic photoreceptor having at least: a substrate; a photosensitive layer provided on the substrate; and an overcoat layer provided on the photosensitive layer. The overcoat layer of the photoreceptor includes at least: a cross-linked component that is obtained by cross-linking of at least one selected from a guanamine compound or a melamine compound and a charge-transporting material having at least one substituent group selected from —OH, —OCH3, —NH2, —SH, or —COOH; fluoro-resin particles; and a fluoro-alkyl group-containing copolymer. The ratio of fluorine atom present in an outermost surface of the overcoat layer as measured with energy dispersive X-ray analysis (EDS) is from approximately 1.0% by mass to approximately 20.0% by mass. The invention further provides a process cartridge, an image forming apparatus, and a method of producing the electrophotographic photoreceptor.Type: ApplicationFiled: August 20, 2010Publication date: July 14, 2011Applicant: FUJI XEROX CO., LTD.Inventors: Hitoshi TAKIMOTO, Masahiro Iwasaki, Daisuke Haruyama, Hidemi Nukada, Mitsuhide Nakamura, Koji Bando
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Publication number: 20100248105Abstract: The present invention provides an electrophotographic photoreceptor that includes: at least a photosensitive layer on a conductive support; a surface layer that contains fluororesin particles and a fluorocarbon comb graft polymer containing a repeating unit derived from a macromonomer and a repeating unit derived from a monomer having a fluoroalkyl group having 1 to 8 carbon atoms; wherein the surface layer contains phosphorus in an amount of about 5 ppm or less, and a process cartridge and electrophotographic apparatus, which use the photoreceptor.Type: ApplicationFiled: September 10, 2009Publication date: September 30, 2010Applicant: FUJI XEROX CO., LTD.Inventors: Hidemi NUKADA, Takahiro SUZUKI
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Publication number: 20100221652Abstract: An electrophotographic photoreceptor includes a conductive substrate, and at least a photosensitive layer on the conductive substrate, a layer located at a surface of the photosensitive layer side of the electrophotographic photoreceptor contains fluorine containing resin particles and a fluoro graft polymer having a fluoroalkyl group having 1 to 7 carbon atoms, and an area for a polystyrene equivalent molecular weight of 700,000 or more is from about 5% to about 20% of the total area in a gel permeation chromatography (GPC) chart for the fluoro graft polymer.Type: ApplicationFiled: September 29, 2009Publication date: September 2, 2010Applicant: FUJI XEROX CO., LTD.Inventors: Hidemi NUKADA, Masaru MIURA, Shinya YAMAMOTO, Isamu ISHIKO, Tetsuya EZUMI
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Patent number: 7763406Abstract: An electrophotographic photoreceptor has at least an undercoat layer and a photosensitive layer formed on a conductive substrate, wherein the undercoat layer contains metal oxide fine particles and an electron acceptor compound having a group reactive with the metal oxide fine particles. A process cartridge and an electrophotographic apparatus use the electrophotographic photoreceptor.Type: GrantFiled: March 17, 2005Date of Patent: July 27, 2010Assignees: Fuji Xerox Co., Ltd., Xerox CorporationInventors: Hidemi Nukada, Hirofumi Nakamura, Yu Qi, Nan-Xing Hu, Ah-Mee Hor, Koji Bando
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Patent number: 7702256Abstract: An image forming apparatus comprising an electrophotographic photoreceptor, a charging unit, an exposure unit, a development unit, and a transfer unit, wherein the image forming apparatus conducts charging, exposure, development, and transfer while moving a circumferential surface of the electrophotographic photoreceptor in a predetermined direction, the image forming apparatus further comprises a controlling unit which controls a moving velocity of the circumferential surface of the electrophotographic photoreceptor so that a time required for processes from charging to development is changeable, the electrophotographic photoreceptor includes an undercoat layer and a photosensitive layer, and the undercoat layer includes a metal oxide particle and an acceptor compound having a group capable of reacting with the metal oxide particle.Type: GrantFiled: March 18, 2005Date of Patent: April 20, 2010Assignees: Fuji Xerox Co., Ltd., Xerox CorporationInventors: Hidemi Nukada, Hirofumi Nakamura, Taketoshi Hoshizaki, Yu Qi, Nan-Xing Hu, Ah-Mee Hor
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Publication number: 20090226208Abstract: An electrophotographic photoreceptor comprising at least a photosensitive layer on an electroconductive substrate, a surface layer of the electrophotographic photoreceptor including a fluorinated alkyl group-containing copolymer having repeating units represented by the following formulae A and B, and fluorine-based resin particles: wherein in Formulae A and B, l, m and n each independently represent a integer number of 1 or more; p, q, r and s each independently represent 0 or an integer of 1 or more; t represents an integer of from 1 to 7; R1, R2, R3, and R4 each independently represent a hydrogen atom or an alkyl group; X represents an alkylene chain, a halogen-substituted alkylene chain, —S—, —O—, —NH— or a single bond; Y represents an alkylene chain, a halogen-substituted alkylene chain, —(CzH2z-1(OH))— or a single bond; and z represents an integer of 1 or more.Type: ApplicationFiled: October 7, 2008Publication date: September 10, 2009Applicant: FUJI XEROX CO., LTD.Inventors: Hidemi NUKADA, Shinya YAMAMOTO, Masaru MIURA, Hitoshi TAKIMOTO, Takahiro SUZUKI, Tetsunao KOUJIRI