Patents by Inventor Kazuki Nebashi
Kazuki Nebashi 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).
-
Publication number: 20220260934Abstract: Provided are an electrophotographic photoconductor that is less likely to cause transfer ghosting even when mounted in an electrophotographic apparatus with high transfer voltage set for high-speed or cleanerless processes, as well as a method of manufacturing the electrophotographic photoconductor, and an electrophotographic apparatus. The electrophotographic photoconductor includes a conductive substrate; an undercoat layer provided on the conductive substrate, and a photosensitive layer provided on the undercoat layer. In the electrophotographic photoconductor, the undercoat layer contains a resin binder and a first filler; and the first filler contains zinc oxide particles that are surface-treated with an N-acylated amino acid or an N-acylated amino acid salt.Type: ApplicationFiled: January 3, 2022Publication date: August 18, 2022Applicant: FUJI ELECTRIC CO., LTD.Inventors: Fengqiang ZHU, Shinjiro SUZUKI, Masaru TAKEUCHI, Kazuki NEBASHI
-
Publication number: 20220197161Abstract: Provided are a photoconductor for electrophotography that has sufficiently high sensitivity and excellent potential stability during repeated printing in various environments, and does not cause problems, such as deterioration of gradation or generation of memory images, especially when applied to monochrome high-speed printers and small medium-speed tandem color printers, as well as a method of manufacturing the photoconductor for electrophotography, and an electrophotographic equipment.Type: ApplicationFiled: December 10, 2021Publication date: June 23, 2022Applicant: FUJI ELECTRIC CO., LTD.Inventors: Seizo KITAGAWA, Shinjiro SUZUKI, Hiroshi EMORI, Kazuki NEBASHI
-
Patent number: 11143976Abstract: A photoconductor for electrophotography includes a base member; an anodic oxide coating provided on the base member and having a film thickness of 2 to 10 ?m; an interlayer provided on the anodic oxide coating and containing a vinyl chloride-vinyl acetate copolymer resin and having a film thickness of 0.02 to 0.3 ?m; and a photosensitive layer including a charge transport layer formed on the interlayer and containing a charge transport material and a first resin binder, and a charge generation layer laminated on the charge transport layer and containing a charge generation material, a hole transport material, a first electron transport material that is a naphthalenetetracarboxylic diimide compound, a second electron transport material that is an azoquinone compound, a diphenoquinone compound, or a stilbenequinone compound and that has a mobility of 17×10?8 cm2/V·s or more, and a second resin binder.Type: GrantFiled: January 3, 2020Date of Patent: October 12, 2021Assignee: FUJI ELECTRIC CO., LTD.Inventors: Seizo Kitagawa, Kazuya Saito, Kazuki Nebashi, Hiroshi Emori, Masaru Takeuchi
-
Publication number: 20200142328Abstract: A photoconductor for electrophotography, including an electroconductive base member, an anodic oxide coating provided on the electroconductive base member, an interlayer provided on the anodic oxide coating, and a photosensitive layer including a charge transport layer formed on the interlayer, and a charge generation layer laminated on the charge transport layer. The charge transport layer contains a charge transport material and a first resin binder. The charge generation layer contains a charge generation material, a hole transport material, an electron transport material, and a second resin binder. The anodic oxide coating has a film thickness of 2 ?m or more and 10 ?m or less. The interlayer contains a vinyl chloride-vinyl acetate copolymer resin, and has a film thickness of 0.02 ?m or more and 0.3 ?m or less.Type: ApplicationFiled: January 3, 2020Publication date: May 7, 2020Applicant: FUJI ELECTRIC CO., LTD.Inventors: Seizo KITAGAWA, Kazuya SAITO, Kazuki NEBASHI, Hiroshi EMORI, Masaru TAKEUCHI
-
Publication number: 20190377274Abstract: A method for producing an electrophotographic photoreceptor having a conductive substrate, and a photosensitive layer formed on the conductive substrate. The method includes the steps of preparing a coating liquid containing a charge generating material, and applying the coating liquid on to the conductive substrate, to thereby form the photosensitive layer. An absolute value of a zeta potential of the charge generating material is 5 mV or more, and a half-value width of a zeta potential distribution of the charge generating material is 100 mV or less.Type: ApplicationFiled: August 23, 2019Publication date: December 12, 2019Applicant: FUJI ELECTRIC CO., LTD.Inventors: Shinjiro SUZUKI, Kazuki NEBASHI, Fengqiang ZHU, Toshiki TAKEUCHI
-
Patent number: 9904186Abstract: A layered, positively-charged electrophotographic photoreceptor, a method for manufacturing the photoreceptor and an electrophotographic apparatus using the photoreceptor are disclosed. The layered, positively-charged electrophotographic photoreceptor includes a conductive support on which is provided a sequential stack composed of a charge transport layer containing at least a first hole transport material and a first binder resin; and a charge generation layer containing at least a charge generation material, a second hole transport material, an electron transport material, and a second binder resin, wherein the charge generation layer and the charge transport layer have a total amount of residual solvents that is 50 ?g/cm2 or less. The photoreceptor is highly sensitive, highly durable, and has excellent image qualities including low image defects from cracks generated due to image memory or contact contamination.Type: GrantFiled: August 5, 2011Date of Patent: February 27, 2018Assignee: FUJI ELECTRIC CO., LTD.Inventors: Seizo Kitagawa, Yasushi Tanaka, Shinjiro Suzuki, Hiroshi Emori, Kazuki Nebashi
-
Patent number: 9081313Abstract: An electrophotographic photoconductor including, in the order recited: a conductive substrate; an undercoat layer provided on the conductive substrate; and a photoconductive layer provided on the undercoat layer and containing at least a phthalocyanine compound as a charge generation material and, as a resin binder, a polyvinyl acetal resin composed of a repeating unit represented by formula (1): where, in formula (1), R is a hydrogen atom, a methyl group, an ethyl group or a propyl group; x, y and z represent mol % of the respective structural units, where x+y+z=100; n is an integer from 1 to 5; a degree of acetalization (x+z) is 86 to 99 mol %; and a molar ratio (x:z) of the structural units is 95:5 to 50:50.Type: GrantFiled: February 14, 2012Date of Patent: July 14, 2015Assignee: FUJI ELECTRIC CO., LTD.Inventors: Kazuki Nebashi, Shinjiro Suzuki, Seizo Kitagawa
-
Patent number: 9081319Abstract: Provided is an electrophotographic photoconductor that has good coating solution stability and metal oxide dispersibility, is free of image defects including ground fogging and black spots, and affords good image characteristics in various environments, as well as a manufacturing method therefore and a device including the same. The electrophotographic photoconductor includes a conductive substrate; an undercoat layer; and a photosensitive layer. The undercoat layer contains, as a main component, a resin obtained by polymerizing, as starting materials, an aromatic dicarboxylic acid, at least one aliphatic dicarboxylic acid having 8 or more carbon atoms, and at least one diamine having a cycloalkane structure, and further contains a metal oxide. The aromatic dicarboxylic acid in the resin is present in an amount that ranges from 0.1 to 10 mol %, and the resin has an acid value and a base value that are each no greater than 10 KOH mg/g.Type: GrantFiled: December 14, 2009Date of Patent: July 14, 2015Assignee: FUJI ELECTRIC CO., LTD.Inventors: Shinjirou Suzuki, Yoichi Nakamura, Ikuo Takaki, Seizo Kitagawa, Kazuki Nebashi
-
Publication number: 20140199619Abstract: A layered, positively-charged electrophotographic photoreceptor, a method for manufacturing the photoreceptor and an electrophotographic apparatus using the photoreceptor are disclosed. The layered, positively-charged electrophotographic photoreceptor includes a conductive support on which is provided a sequential stack composed of a charge transport layer containing at least a first hole transport material and a first binder resin; and a charge generation layer containing at least a charge generation material, a second hole transport material, an electron transport material, and a second binder resin, wherein the charge generation layer and the charge transport layer have a total amount of residual solvents that is 50 ?g/cm2 or less. The photoreceptor is highly sensitive, highly durable, and has excellent image qualities including low image defects from cracks generated due to image memory or contact contamination.Type: ApplicationFiled: August 5, 2011Publication date: July 17, 2014Applicant: FUJI ELECTRIC CO., LTD.Inventors: Seizo Kitagawa, Yasushi Tanaka, Shinjiro Suzuki, Hiroshi Emori, Kazuki Nebashi
-
Patent number: 8735031Abstract: An electrophotographic photoreceptor includes an electroconductive substrate; an undercoat layer provided on the electroconductive substrate and composed of: metal oxide fine particles including particles of at least one metal oxide and at least one organic compound provided on the particles of the at least one metal oxide as a surface treatment; and a copolymer resin synthesized by copolymerization of essential constituent monomers composed of a dicarboxylic acid, a diol, a triol and a diamine; and a photosensitive layer laminated on the undercoat layer. The undercoat layer permits (a) attaining stable electric potential characteristics in all environments ranging from low temperature and low humidity environments to high temperature and high humidity environments, (b) suppressing the occurrence of printing defects and density differences, and (c) simultaneously attaining transfer restorability and restorability from intense light-induced fatigue even in a wide variety of usages and operation environments.Type: GrantFiled: November 27, 2009Date of Patent: May 27, 2014Assignee: Fuji Electric Co., Ltd.Inventors: Kazuki Nebashi, Yoichi Nakamura, Ikuo Takaki, Seizo Kitagawa, Shinjiro Suzuki
-
Patent number: 8597864Abstract: Provided is a photoreceptor for electrophotography, a process for producing the photoreceptor, and an electrophotographic apparatus that includes the photoreceptor. The photoreceptor has a photosensitive layer which contains a resin binder that is a copolymerized polyallylate resin. An electrophotographic apparatus having a photoreceptor drum that includes this photoreceptor has a reduced surface frictional resistance throughout the printing period from the beginning to after printing, thus reducing the amount of surface wear while producing satisfactory images.Type: GrantFiled: February 16, 2009Date of Patent: December 3, 2013Assignee: Fuji Electric Co., Ltd.Inventors: Shinjiro Suzuki, Yoichi Nakamura, Seizo Kitagawa, Fengqiang Zhu, Kazuki Nebashi
-
Publication number: 20130316276Abstract: An electrophotographic photoconductor including, in the order recited: a conductive substrate; an undercoat layer provided on the conductive substrate; and a photoconductive layer provided on the undercoat layer and containing at least a phthalocyanine compound as a charge generation material and, as a resin binder, a polyvinyl acetal resin composed of a repeating unit represented by formula (1): where, in formula (1), R is a hydrogen atom, a methyl group, an ethyl group or a propyl group; x, y and z represent mol % of the respective structural units, where x+y+z=100; n is an integer from 1 to 5; a degree of acetalization (x+z) is 86 to 99 mol %; and a molar ratio (x:z) of the structural units is 95:5 to 50:50.Type: ApplicationFiled: February 14, 2012Publication date: November 28, 2013Applicant: FUJI ELECTRIC CO., LTD.Inventors: Kazuki Nebashi, Shinjiro Suzuki, Seizo Kitagawa
-
Patent number: 8404414Abstract: Electrophotographic photoconductor including a conductive substrate; and a photosensitive layer provided on the conductive substrate and including at least a charge generation material; a charge transport material; and a resin binder including a copolymer polyarylate resin represented by general formula (I) below: and manufacturing method therefore. Good images with less cracking occurrence are obtained during recycling of a photosensitive drum and peripheral members thereof that includes the electrophotographic photoconductor, and also when a liquid development process is employed.Type: GrantFiled: April 2, 2009Date of Patent: March 26, 2013Assignee: Fuji Electric Co., Ltd.Inventors: Ikuo Takaki, Yoichi Nakamura, Seizo Kitagawa, Kazuki Nebashi, Fengqiang Zhu
-
Patent number: 8354210Abstract: An electrophotographic photoconductor that stabilizes electrical performances and prevents generation of image faults such as memories, irrespective of types of organic materials of resin binder and charge transport material, and variation of temperature and humidity of the operation environment. An electrophotographic photoconductor includes at least a photosensitive layer formed over a conductive substrate, wherein the photosensitive layer contains a cyclohexane dimethanol-diaryl ester compound represented by the formula (I): in formula (I), each of R1 through R10 represents independently, a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group of carbon number of from 1 to 5, a substituted or unsubstituted aryl group, or a substituted or unsubstituted alkoxy group of carbon number of from 1 to 5.Type: GrantFiled: April 5, 2007Date of Patent: January 15, 2013Assignee: Fuji Electric Co., Ltd.Inventors: Ikuo Takaki, Yoichi Nakamura, Kazuki Nebashi
-
Publication number: 20120058422Abstract: Provided is a photoreceptor for electrophotography, a process for producing the photoreceptor, and an electrophotographic apparatus that includes the photoreceptor. The photoreceptor has a photosensitive layer which contains a resin binder that is a copolymerized polyallylate resin. An electrophotographic apparatus having a photoreceptor drum that includes this photoreceptor has a reduced surface frictional resistance throughout the printing period from the beginning to after printing, thus reducing the amount of surface wear while producing satisfactory images.Type: ApplicationFiled: February 16, 2009Publication date: March 8, 2012Applicant: FUJI ELECTRIC CO., LTDInventors: Shinjiro Suzuki, Yoichi Nakamura, Seizo Kitagawa, Fengqiang Zhu, Kazuki Nebashi
-
Publication number: 20120034556Abstract: An electrophotographic photoreceptor includes an electroconductive substrate; an undercoat layer provided on the electroconductive substrate and composed of: metal oxide fine particles including particles of at least one metal oxide and at least one organic compound provided on the particles of the at least one metal oxide as a surface treatment; and a copolymer resin synthesized by copolymerization of essential constituent monomers composed of a dicarboxylic acid, a diol, a triol and a diamine; and a photosensitive layer laminated on the undercoat layer. The undercoat layer permits (a) attaining stable electric potential characteristics in all environments ranging from low temperature and low humidity environments to high temperature and high humidity environments, (b) suppressing the occurrence of printing defects and density differences, and (c) simultaneously attaining transfer restorability and restorability from intense light-induced fatigue even in a wide variety of usages and operation environments.Type: ApplicationFiled: November 27, 2009Publication date: February 9, 2012Applicant: FUJI ELECTRIC CO., LTD.Inventors: Kazuki Nebashi, Yoichi Nakamura, Seizo Kitagawa, Ikuo Takaki, Shinjiro Suzuki
-
Publication number: 20110244381Abstract: Provided is an electrophotographic photoconductor that has good coating solution stability and metal oxide dispersibility, is free of image defects including ground fogging and black spots, and affords good image characteristics in various environments, as well as a manufacturing method therefore and a device including the same. The electrophotographic photoconductor includes a conductive substrate; an undercoat layer; and a photosensitive layer. The undercoat layer contains, as a main component, a resin obtained by polymerizing, as starting materials, an aromatic dicarboxylic acid, at least one aliphatic dicarboxylic acid having 8 or more carbon atoms, and at least one diamine having a cycloalkane structure, and further contains a metal oxide. The aromatic dicarboxylic acid in the resin is present in an amount that ranges from 0.1 to 10 mol %, and the resin has an acid value and a base value that are each no greater than 10 KOH mg/g.Type: ApplicationFiled: December 14, 2009Publication date: October 6, 2011Applicant: FUJI ELECTRIC SYSTEMS CO., LTD.Inventors: Shinjirou Suzuki, Yoichi Nakamura, Ikuo Takaki, Seizo Kitagawa, Kazuki Nebashi
-
Publication number: 20110189603Abstract: Electrophotographic photoconductor including a conductive substrate; and a photosensitive layer provided on the conductive substrate and including at least a charge generation material; a charge transport material; and a resin binder including a copolymer polyarylate resin represented by general formula (I) below: and manufacturing method therefore. Good images with less cracking occurrence are obtained during recycling of a photosensitive drum and peripheral members thereof that includes the electrophotographic photoconductor, and also when a liquid development process is employed.Type: ApplicationFiled: April 2, 2009Publication date: August 4, 2011Applicant: FUJI ELECTRIC SYSTEMS CO., LTD.Inventors: Ikuo Takaki, Yoichi Nakamura, Seizo Kitagawa, Kazuki Nebashi, Fengqiang Zhu
-
Patent number: 7723000Abstract: An electrophotographic photoconductor includes an undercoat layer and a photosensitive layer sequentially provided on a conductive substrate. The undercoat layer is mainly composed of a resin and contains a metal oxide. The resin is provided by mixing and polymerizing raw materials of aromatic dicarboxylic acid in a range of 0.1 to 10 mol %, two or more types of dicarboxylic acid other than the aromatic dicarboxylic acid, two or more types of diamine, and at least one type of cyclic amide compound. The resin exhibits an acid value and a base value each of at most 6.0 KOH mg/g. Advantageously, generation of secondary aggregates in the undercoat layer, which result in image defects such as black spots and fogging on a white field, is suppressed.Type: GrantFiled: December 20, 2006Date of Patent: May 25, 2010Assignee: Fuji Electric Device Technology Co., Ltd.Inventors: Shinjirou Suzuki, Yoichi Nakamura, Ikuo Takaki, Kazuki Nebashi
-
Publication number: 20100028791Abstract: An electrophotographic photoconductor that stabilizes electrical performances and prevents generation of image faults such as memories, irrespective of types of organic materials of resin binder and charge transport material, and variation of temperature and humidity of the operation environment. An electrophotographic photoconductor includes at least a photosensitive layer formed over a conductive substrate, wherein the photosensitive layer contains a cyclohexane dimethanol-diaryl ester compound represented by the formula (I): in formula (I), each of R1 through R10 represents independently, a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group of carbon number of from 1 to 5, a substituted or unsubstituted aryl group, or a substituted or unsubstituted alkoxy group of carbon number of from 1 to 5.Type: ApplicationFiled: April 5, 2007Publication date: February 4, 2010Applicant: Fuji Electric Device Technology Co.,Ltd.Inventors: Ikou Takaki, Yoichi Nakamura, Kazuki Nebashi