Patents by Inventor Sumitaka Nogami
Sumitaka Nogami 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: 5972550Abstract: A laminate type organic electrophotographic photoconductor uses a thick undercoating layer as an intermediate layer for reducing the influence of a conductive substrate on a charge generation layer. An organosilicon coupling agent is bonded to the surfaces of small particles of titanium oxide, zirconium oxide, aluminum oxide or cerium oxide, at an Existence Ratio represented by the peak intensity ratio (Si2p/Me2p, Me=Ti, Zr or Al) or (Si2p/Ce3d) of from 0.15 to 0.6 of a bonding energy spectrum measured by X-ray photoelectron spectroscopy. The metal oxide small particles, the surfaces of which have been treated mechanochemically, are cleaned to reduce the ionic impurity concentration of the undercoating layer to below 1 ppm. The cleaned metal oxide small particles are dispersed into the polyamide copolymer binder resin for the undercoating layer.Type: GrantFiled: January 7, 1997Date of Patent: October 26, 1999Assignee: Fuji Electric Co., Ltd.Inventors: Yukihisa Tamura, Sumitaka Nogami
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Patent number: 5928824Abstract: An electrophotographic photoconductor includes a conductive substrate, an intermediate layer on the conductive substrate, and a photoconductive layer on the intermediate layer. The intermediate layer includes an n-type semiconductive organic pigment.Type: GrantFiled: July 29, 1997Date of Patent: July 27, 1999Assignee: Fuji Electric Co., Ltd.Inventors: Takashi Obinata, Sumitaka Nogami
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Patent number: 5780193Abstract: In an electrophotographic photoconductor wherein an intermediate layer and a photosensitive layer are successively formed on a conductive substrate, a conductive boron polymer is used for forming the intermediate layer.Type: GrantFiled: August 12, 1997Date of Patent: July 14, 1998Assignee: Fuji Electric Co., Ltd.Inventors: Shinjiro Suzuki, Sumitaka Nogami
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Patent number: 5733696Abstract: An inverted-lamination organic positive-photoconductor for electrophotography comprises a conductive substrate, a charge transport layer on the conductive substrate, a charge generation layer on the charge transport layer, a surface protection layer on the charge generation layer, with the surface protection layer containing a polyaniline compound which includes being doped with a protonic acid selected from a sulfonic acid, a carboxylic acid, an organophosphoric acid, or a potential compound, wherein the potential compound is a compound that reacts to form one of a sulfonic acid, a carboxylic acid, or an organophosphoric acid.Type: GrantFiled: September 24, 1996Date of Patent: March 31, 1998Assignee: Fuji Electric Co., Ltd.Inventors: Akira Takahashi, Sumitaka Nogami
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Patent number: 5725982Abstract: In order to provide a laminate type organic photoconductor for electrophotography excellent in abrasion resistance and having enhanced stability of characteristics and high productivity, a binder resin of a charge transport layer as an outermost layer of the laminate type photoconductor includes a specified copolymer polycarbonate resin containing at least one constitutional unit of those represented by a formula (1) and at least one constitutional unit of those represented by a formula(2).Type: GrantFiled: May 14, 1996Date of Patent: March 10, 1998Assignee: Fuji Electric Co., Ltd.Inventors: Sumitaka Nogami, Michihiro Kitazawa, Katsuhiro Sato
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Patent number: 5707766Abstract: An electrophotographic photoconductor includes an electroconductive substrate and a photosensitive layer which is provided on the electroconductive substrate and which includes a charge generating agent, a hole charge transporting agent, and antioxidant composed of at least two antioxidant materials. In a second embodiment, the electrophotographic photoconductor includes an electroconductive substrate and a photosensitive layer which is provided on the electroconductive substrate and which includes a charge generating layer containing a charge generating agent and a charge transporting layer containing a hole charge transporting agent, and antioxidant composed of at least two antioxidant materials.Type: GrantFiled: August 31, 1995Date of Patent: January 13, 1998Assignee: Fuji Electric Co., Ltd.Inventors: Sumitaka Nogami, Michihiro Kitazawa
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Patent number: 5700613Abstract: A photoconductor for electrophotography includes a conductive substrate; an undercoating layer formed on the conductive substrate; a charge generation layer formed on the undercoating layer; and a charge transport layer formed on the charge generation layer, wherein the undercoating layer comprises a coating film containing as the main constituent thereof an addition compound containing iodine added thereto, and wherein the charge generation layer comprises a P-type charge generation material containing iodine added thereto.Type: GrantFiled: January 11, 1996Date of Patent: December 23, 1997Assignee: Fuji Electric Co., Ltd.Inventors: Sumitaka Nogami, Michihiro Kitazawa, Katsuhiro Sato
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Patent number: 5618646Abstract: An electrophotographic photoreceptor has a conductive substrate and a photosensitive layer formed on the substrate. The photosensitive layer contains one compound which is selected from the group of the compounds represented by the formulae (I), (II), (III), (IV), and (V). Therefore, the electrophotographic photoreceptor shows stable characteristics, good durability, and long span of life in repeat use.Type: GrantFiled: January 11, 1996Date of Patent: April 8, 1997Assignee: Fuji Electric Co., Ltd.Inventors: Sumitaka Nogami, Michihiro Kitazawa, Katsuhiro Sato, Yoshimasa Tomiuchi
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Patent number: 5612158Abstract: An electrophotographic photoconductor include an conductive substrate; an undercoat layer provided on the conductive substrate; and a photosensitive layer having charge-generation and charge-transport functions provided on the undercoat layer. The undercoat layer includes a polyamide resin and methylhydrogenpolysiloxane-treated titanium dioxide and preferably styrene-maleic acid half-ester copolymer. The photoconductor can be produced by the steps of: dispersing a polyamide resin and methylhydrogenpolysiloxane-treated titanium dioxide and preferably styrene-maleic acid half-ester copolymer in a mixture solvent of an alcohol-type solvent and a halogenated hydrocarbon-type solvent, thereby preparing a coating liquid for an undercoat layer; applying the coating liquid onto a conductive substrate, thereby providing an undercoat layer on the substrate; and forming a photosensitive layer on the undercoat layer.Type: GrantFiled: April 1, 1996Date of Patent: March 18, 1997Assignee: Fuji Electric Co., Ltd.Inventors: Yasushi Iguchi, Sumitaka Nogami, Kyoko Kitagawa
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Patent number: 5595847Abstract: A photoconductor for electrophotography includes an electroconductive substrate; and a photosensitive layer provided on the electroconductive substrate and composed of an intermediate layer, a charge generation layer, and a charge transfer layer laminated in this order, wherein the intermediate layer is a doped layer and is composed of a cured layer of a copolycondensate between an amino resin and a phenolic resin hat has been subjected to doping with at least one dopant.Type: GrantFiled: December 21, 1994Date of Patent: January 21, 1997Assignee: Fuji Electric Co., Ltd.Inventors: Sumitaka Nogami, Michihiro Kitazawa, Katsuhiro Sato
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Patent number: 5561022Abstract: An electrophotographic photoconductor having superior electrical properties and image quality which are not affected by the external environment is provided. The photoconductor includes an intermediate layer formed between a conductive substrate and a photosensitive layer. The intermediate layer is a hardened film containing as its main components melamine resin, aromatic carboxylic acid and/or aromatic carboxylic anhydride, and fixed iodine. Alternatively, the intermediate layer is composed of normal-butylated melamine resin, acid and/or an acid equivalent, and fixed iodine. The film thickness of the intermediate layer according to the present invention need not be as thin as in the prior art. An intermediate layer of such a thickness can cover various defects on the surface of the conductive substrate, and a uniform photosensitive layer with few film defects can be formed on the intermediate layer.Type: GrantFiled: May 3, 1995Date of Patent: October 1, 1996Assignee: Fuji Electric Co., Ltd.Inventors: Sumitaka Nogami, Hideki Kina, Kaneyuki Mantoku
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Patent number: 5556728Abstract: An electrophotographic photoconductor having superior electrical properties and image quality which are not affected by the external environment is provided. The photoconductor includes an intermediate layer formed between a conductive substrate and a photosensitive layer. The intermediate layer is a hardened film containing as its main components melamine resin, aromatic carboxylic acid and/or aromatic carboxylic anhydride, and fixed iodine. Alternatively, the intermediate layer is composed of normal-butylated melamine resin, acid and/or an acid equivalent, and fixed iodine. The film thickness of the intermediate layer according to the present invention need not be as thin as in the prior art. An intermediate layer of such a thickness can cover various defects on the surface of the conductive substrate, and a uniform photosensitive layer with few film defects can be formed on the intermediate layer.Type: GrantFiled: February 28, 1994Date of Patent: September 17, 1996Assignee: Fuji Electric Co., Ltd.Inventors: Sumitaka Nogami, Hideki Kina, Kaneyuki Mantoku
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Patent number: 5478685Abstract: An electrophotographic photoconductor has an intermediate layer formed between an electrically conductive substrate and photosensitive layer. The intermediate layer is made of a hardened film formed by hardening an amino resin with a catalyst comprising aromaticsulfonic acid, alicyclicsulfonic acid, a mixture thereof, or latent acid thereof to provide good image qualities without causing any troubles in the process of image formation.Type: GrantFiled: March 31, 1994Date of Patent: December 26, 1995Assignee: Fuji Electric Co., Ltd.Inventors: Sumitaka Nogami, Hideki Kina, Kaneyuki Mantoku
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Patent number: 5456989Abstract: A positively charged organic photosensitive body is provided, the photosensitive body being free from public hazards, and being highly sensitive and highly durable. The photosensitive body has a photosensitive layer of a laminated structure on a conductive substrate. The photosensitive layer has a charge transport layer (I) having hole mobility, a charge generation layer, and a charge transport layer (II) containing a curing product of a doped amino resin and having electron mobility. The charge transport layer (I), the charge generation layer, and the charge transport layer (II) are laminated in this order on the conductive substrate. Various suitable substances may be added to the charge transport layer (II), thereby enhancing its durability without deteriorating the photosensitive characteristics.Type: GrantFiled: November 23, 1994Date of Patent: October 10, 1995Assignee: Fuji Electric Co., Ltd.Inventors: Sumitaka Nogami, Michihiro Kitazawa, Katsuhiro Sato
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Patent number: 5432034Abstract: An organic photosensitive member for electrophotography is provided which comprises a photosensitive layer 3 formed on an electroconductive substrate 1 via an undercoating layer 2, the photosensitive layer 3 comprising a charge generating layer 4 and a charge transporting layer 5, wherein the undercoating layer 2 consists essentially of 12/6/66 copolymeric polyamide expressed by the general formula (I) ##STR1## and a styrene/maleic acid half ester copolymer. By providing such an undercoating layer, it becomes possible to obtain a photosensitive member having excellent electrophotographic characteristics, involving minimal changes in these characteristics during repeated use, and giving a high quality image stably.Type: GrantFiled: January 13, 1994Date of Patent: July 11, 1995Assignee: Fuji Electric Co., Ltd.Inventors: Sumitaka Nogami, Yasushi Iguchi
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Patent number: 5407767Abstract: A photoconductor for electrophotography comprises an electroconductive substrate and a photosensitive layer formed on the conductive substrate and including a charge generating material and a charge transporting material. The charge transporting material comprises at least one compound selected from indole compounds represented by the following general formula (I) and at least one compound selected from benzidine compounds represented by the following general formula (II).Type: GrantFiled: February 7, 1994Date of Patent: April 18, 1995Assignee: Fuji Electric Co., Ltd.Inventors: Sumitaka Nogami, Yoichi Nakamura, Nobuyoshi Mori
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Patent number: 5405725Abstract: An electrophotographic photoconductor for an electrophotographic apparatus which employs contact charging, includes a conductive substrate; and a photoconductive layer for contacting an electric conductor, which photoconductive layer includes a charge generating layer which is formed on the conductive substrate and which comprises a binder and a charge generating agent comprised of particles of phthalocyanine pigment or 4,10-dibromoanthanthrone pigment dispersed in the binder; and a charge transporting layer which is formed on the charge generating layer, wherein the particles of pigment have a major axis which does not exceed 1000 nm and a minor axis which is not less than 10 nm, and wherein the particles of pigment have a ratio of the major axis to the minor axis which does not exceed 3. Alternativly, the charge transporting layer is formed on the conductive substrate and the charge generating layer is formed on the charge transporting layer.Type: GrantFiled: October 7, 1992Date of Patent: April 11, 1995Assignee: Fuji Electric Co., Ltd.Inventors: Yoichi Nakamura, Sumitaka Nogami, Hideki Komiyama
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Patent number: 5401600Abstract: An intermediate layer having fine hydrophobic silica particles is positioned between a substrate and a photosensitive layer. The fine hydrophobic silica particles preferably have a primary particle-averaged particle size of not more than 50 nm and desirably the surface of the fine hydrophobic silica particles is alkyl-silylated or treated with silicone.Type: GrantFiled: September 24, 1992Date of Patent: March 28, 1995Assignee: Fuji Electric Co., Ltd.Inventors: Koichi Aizawa, Sumitaka Nogami, Takashi Obinata
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Patent number: 5393627Abstract: The photoconductor for electrophotography comprises an electroconductive substrate and a photosensitive layer formed on the substrate. The photosensitive layer may be a monolayer or function-separated laminate type one which comprise a charge generating layer and a charge transporting layer laminated one on another. The charge transporting layer contains a specified diamine compound represented by general formula (I) below as the charge transporting substance. ##STR1## wherein R.sub.1 and R.sub.2, which are the same or different, each represent independently an alkyl group, an alkoxy group, or a halogen atom; R.sub.3, R.sub.4, R.sub.5 and R.sub.6, which are the same or different, each represent independently an aryl group or an alkyl group, or R.sub.3 and R.sub.4, or R.sub.5 and R.sub.6, combine and form a condensed aromatic ring; and X represents an oxygen atom, a sulfur atom, a carbonyl group, or a sulfonyl group.Type: GrantFiled: February 1, 1993Date of Patent: February 28, 1995Assignee: Fuji Electric Co., Ltd.Inventors: Yoichi Nakamura, Nobuyoshi Mori, Sumitaka Nogami
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Patent number: 5368966Abstract: A photosensitive member for electrophotography has a photosensitive layer provided on a photoconductive substrate. The photosensitive layer contains at least one of indole derivatives represented by a chemical formula (I): ##STR1## wherein R.sub.1 and R.sub.2 are members selected from a group consisting of hydrogen atom and alkyl, aralkyl, allyl and alkoxy groups having 1-9 carbon atoms (but R.sub.1 and R.sub.2 do not stand for hydrogen atoms at the same time); R.sub.3 is a member selected from a group consisting of hydrogen and halogen atoms and alkyl and alkoxy groups having 1-3 carbon atoms; X is a member selected from a group consisting of alkylen, allylen, carbonyl, sulfonyl, sulfinyl and sulfide groups and oxygen atom; and n stands for an integer of 0 or 1.Type: GrantFiled: May 12, 1993Date of Patent: November 29, 1994Assignee: Fuji Electric Co., Ltd.Inventors: Yoichi Nakamura, Nobuyoshi Mori, Sumitaka Nogami