Patents by Inventor Tomofumi SHIMIZU
Tomofumi SHIMIZU 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: 20190025720Abstract: An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The photosensitive layer includes a charge generating layer and a charge transport layer. The charge generating layer contains a charge generating material. The charge transport layer contains a hole transport material and a binder resin. The charge transport layer further contains an electron acceptor compound. The hole transport material includes a compound represented by general formula (1). In general formula (1), R1, R2, R3, R4, R5, R6, R7, R8, R9, and R10 each represent, independently of one another, a hydrogen atom or a methyl group.Type: ApplicationFiled: July 16, 2018Publication date: January 24, 2019Applicant: KYOCERA Document Solutions Inc.Inventors: Jun AZUMA, Kensuke KOJIMA, Tomofumi SHIMIZU
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Publication number: 20180356744Abstract: An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer having a single-layer structure. The photosensitive layer contains a charge generating material, an electron transport material, a polycarbonate resin, and a hole transport material. The electron transport material includes a compound having a halogen atom and represented by general formula (1), (2), (3), (4), or (5). The hole transport material includes a compound represented by general formula (20), (21), (22), (23), (24), (25), (26), or (27). A charge of calcium carbonate as measured by charging the calcium carbonate through friction with the photosensitive layer is at least +6.5 ?C/g. A Vickers hardness of the photosensitive layer at 45° C. is at least 17.0 HV.Type: ApplicationFiled: June 5, 2018Publication date: December 13, 2018Applicant: KYOCERA Document Solutions Inc.Inventor: Tomofumi SHIMIZU
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Publication number: 20180356743Abstract: An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer having a single-layer structure. The photosensitive layer contains a charge generating material, an electron transport material, a polycarbonate resin, and a hole transport material. The electron transport material includes a compound having a halogen atom and represented by general formula (1), (2), (3), (4), or (5). The polycarbonate resin has a terminal group having a fluoro group and represented by general formula (10). The hole transport material includes a compound represented by general formula (20), (21), (22), (23), (24), (25), (26), or (27). A charge of calcium carbonate as measured by charging the calcium carbonate through friction with the photosensitive layer is at least +6.5 ?C/g. The photosensitive layer has a Vickers hardness of at least 17.0 HV at 45° C.Type: ApplicationFiled: June 8, 2018Publication date: December 13, 2018Applicant: KYOCERA Document Solutions Inc.Inventor: Tomofumi SHIMIZU
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Publication number: 20180299797Abstract: An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer having a single-layer structure. The photosensitive layer contains a charge generating material, an electron transport material, and a binder resin. The electron transport material includes a compound having a halogen atom and represented by a general formula (1), (2), (3), (4), or (5). The binder resin includes a polyarylate resin. The polyarylate resin includes at least one type of repeating unit each represented by general formula (11), at least one type of repeating unit each represented by general formula (12), and a terminal group represented by general formula (13). In general formula (13), Rf represents a chain aliphatic group substituted by at least one fluoro group. A charge of calcium carbonate charged by friction between the photosensitive layer and the calcium carbonate is at least +8.0 ?C/g.Type: ApplicationFiled: April 9, 2018Publication date: October 18, 2018Applicant: KYOCERA Document Solutions Inc.Inventors: Tomofumi SHIMIZU, Jun AZUMA
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Publication number: 20180246424Abstract: A polyarylate resin includes at least one type of repeating unit represented by a general formula (1), at least one type of repeating unit represented by a general formula (2), and a terminal group represented by a general formula (3). R1, R2, R3, and R4 each represent, independently of one another, a hydrogen atom or a methyl group. R5 and R6 each represent, independently of each other, a hydrogen atom or a C1-4 alkyl group. R5 and R6 may bond together to represent a C5-7 cycloalkylidene group. X1 represents a divalent group represented by a chemical formula (2A), (2B), (2C), or (2D) with the proviso that when only one type of repeating unit represented by the general formula (2) is included, X1 does not represent a divalent group represented by the chemical formula (2D). Rf represents a chain aliphatic group having at least one fluoro group.Type: ApplicationFiled: February 26, 2018Publication date: August 30, 2018Applicant: KYOCERA Document Solutions Inc.Inventors: Jun AZUMA, Kensuke OKAWA, Akihiko OGATA, Kenji KITAGUCHI, Tomofumi SHIMIZU
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Publication number: 20180215183Abstract: An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The photosensitive layer is a single-layer photosensitive layer. The photosensitive layer contains a charge generating material, a hole transport material, an electron transport material, a binder resin, and an additive. The additive contains a carboxylic acid anhydride. A reduction potential of the carboxylic acid anhydride is at least ?1.40 V versus a reference electrode (Ag/Ag+). The carboxylic acid anhydride is contained in an amount of at least 0.02 parts by mass and no greater than 10.00 parts by mass relative to 100 parts by mass of the binder resin.Type: ApplicationFiled: January 25, 2018Publication date: August 2, 2018Applicant: KYOCERA Document Solutions Inc.Inventors: Tomofumi SHIMIZU, Kiichiro OJI
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Patent number: 10007199Abstract: A single-layer electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The conductive substrate contains aluminum or an aluminum alloy. A surface of the conductive substrate has an aluminum oxide film or an aluminum alloy oxide film. The photosensitive layer is disposed directly on the conductive substrate. The photosensitive layer contains an electron transport material. The electron transport material has a reduction potential of at least ?0.88 V and no greater than ?0.66 V versus a reference electrode (Ag/Ag+). The single-layer electrophotographic photosensitive member has a leakage onset voltage of at least 5.0 kV in a high temperature and humidity environment at a temperature of 30° C. and a relative humidity of 80%. The leakage onset voltage is a voltage applied to the single-layer electrophotographic photosensitive member at which current leakage starts.Type: GrantFiled: August 26, 2016Date of Patent: June 26, 2018Assignee: KYOCERA Document Solutions Inc.Inventors: Tomofumi Shimizu, Junichiro Otsubo, Yasuhiro Oishi
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Patent number: 10001716Abstract: A positively chargeable single-layer electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The photosensitive layer contains at least a charge generating material, a hole transport material, an electron transport material, and an electron accepting compound. The hole transport material includes a benzidine derivative. The electron transport material includes at least one compound selected from the group consisting of compounds represented by general formulae (1), (2), (3), and (4) shown below. The electron accepting compound includes at least one compound selected from the group consisting of compounds represented by general formulae (5) and (6) shown below.Type: GrantFiled: March 22, 2016Date of Patent: June 19, 2018Assignee: KYOCERA Document Solutions Inc.Inventors: Tomofumi Shimizu, Makoto Shishido
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Publication number: 20180148538Abstract: A polyarylate resin is represented by general formula (1) shown below. In general formula (1), R1 and R2 each represent, independently of one another, a hydrogen atom or a methyl group. r and s each represent an integer of at least 0 and no greater than 49. t and u each represent an integer of at least 1 and no greater than 50. r+s+t+u=100. r+t=s+u. X and Y each represent, independently of one another, a divalent group represented by chemical formula (1-1), chemical formula (1-2), chemical formula (1-3), or chemical formula (1-4). X and Y are different from one another.Type: ApplicationFiled: November 28, 2017Publication date: May 31, 2018Applicant: KYOCERA Document Solutions Inc.Inventors: Jun AZUMA, Kenji KITAGUCHI, Kensuke OKAWA, Seiki HASUNUMA, Tomofumi SHIMIZU
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Publication number: 20180046099Abstract: An electrophotographic photosensitive member includes a photosensitive layer. The photosensitive layer contains a charge generating material, a hole transport material, and a binder resin. The binder resin contains a polyarylate resin represented by general formula (1). In general formula (1), r and s each represent an integer of at least 0 and no greater than 49 and t and u represents an integer of at least 1 and no greater than 50. Furthermore, r+s+t+u=100 and r+t=s+u. X and Y each represent, independently of one another, a divalent group represented by chemical formula (1-1), (1-2), (1-3), or (1-4).Type: ApplicationFiled: August 4, 2017Publication date: February 15, 2018Applicant: KYOCERA Document Solutions Inc.Inventors: Jun AZUMA, Kensuke OKAWA, Seiki HASUNUMA, Tomofumi SHIMIZU
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Publication number: 20180046101Abstract: An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The photosensitive layer is a single-layer photosensitive layer. The photosensitive layer contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. The binder resin contains a polyarylate resin (1). The polyarylate resin is represented by general formula (1). The photosensitive layer has a scratch resistance depth of no greater than 0.50 ?m. The photosensitive layer has a Vickers hardness of at least 17.0 HV.Type: ApplicationFiled: August 3, 2017Publication date: February 15, 2018Applicant: KYOCERA Document Solutions Inc.Inventors: Tomofumi SHIMIZU, Keiji MARUO, Jun AZUMA
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Publication number: 20180046100Abstract: An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The photosensitive layer is a single-layer photosensitive layer. The photosensitive layer contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. The binder resin contains a polyarylate resin. The polyatylate resin is represented by general formula (1). The hole transport material contains a compound represented by general formula (HTM1), (HTM2), (HTM3), (HTM4), (HTM5), (HTM6), or (HTM7). The photosensitive layer has a scratch resistance depth of no greater than 0.50 ?m. The photosensitive layer has a Vickers hardness of at least 17.0 HV.Type: ApplicationFiled: August 4, 2017Publication date: February 15, 2018Applicant: KYOCERA Document Solutions Inc.Inventors: Keiji MARUO, Tomofumi SHIMIZU, Jun AZUMA
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Publication number: 20180046098Abstract: An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The photosensitive layer is a single layer. The photosensitive layer contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. The photosensitive layer has a scratch resistance depth of no greater than 0.50 ?m.Type: ApplicationFiled: August 3, 2017Publication date: February 15, 2018Applicant: KYOCERA Document Solutions Inc.Inventors: Tomofumi SHIMIZU, Keiji MARUO
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Publication number: 20170068177Abstract: A single-layer electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The conductive substrate contains aluminum or an aluminum alloy. A surface of the conductive substrate has an aluminum oxide film or an aluminum alloy oxide film. The photosensitive layer is disposed directly on the conductive substrate. The photosensitive layer contains an electron transport material. The electron transport material has a reduction potential of at least ?0.88 V and no greater than ?0.66 V versus a reference electrode (Ag/Ag+). The single-layer electrophotographic photosensitive member has a leakage onset voltage of at least 5.0 kV in a high temperature and humidity environment at a temperature of 30° C. and a relative humidity of 80%. The leakage onset voltage is a voltage applied to the single-layer electrophotographic photosensitive member at which current leakage starts.Type: ApplicationFiled: August 26, 2016Publication date: March 9, 2017Applicant: KYOCERA Document Solutions Inc.Inventors: Tomofumi SHIMIZU, Junichiro OTSUBO, Yasuhiro OISHI
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Patent number: 9541849Abstract: A positively chargeable single-layer electrophotographic photosensitive member includes a single-layer photosensitive layer. The single-layer photosensitive layer contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. The electron transport material contains two or more compounds selected from the group consisting of compounds represented by the chemical formulas (1) to (4) below.Type: GrantFiled: February 26, 2014Date of Patent: January 10, 2017Assignee: KYOCERA Document Solutions Inc.Inventors: Tomofumi Shimizu, Hiroki Tsurumi, Yohei Yamamoto, Eiichi Miyamoto
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Publication number: 20160282732Abstract: A positively chargeable single-layer electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The photosensitive layer contains at least a charge generating material, a hole transport material, an electron transport material, and an electron accepting compound. The hole transport material includes a benzidine derivative. The electron transport material includes at least one compound selected from the group consisting of compounds represented by general formulae (1), (2), (3), and (4) shown below. The electron accepting compound includes at least one compound selected from the group consisting of compounds represented by general formulae (5) and (6) shown below.Type: ApplicationFiled: March 22, 2016Publication date: September 29, 2016Applicant: KYOCERA Document Solutions Inc.Inventors: Tomofumi SHIMIZU, Makoto SHISHIDO
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Patent number: 8980507Abstract: A positively chargeable monolayer electrophotographic photosensitive member includes a photosensitive layer provided on a conductive substrate and having a monolayer structure containing at least a charge generating material, a hole transport material, an electron transport material, and a binder resin. The photosensitive layer contains a hole transport material containing a triarylamine derivative represented by a formula (1) below and an electron transport material containing a compound selected from the group consisting of quinone compounds having a predetermined structure.Type: GrantFiled: November 26, 2013Date of Patent: March 17, 2015Assignee: KYOCERA Document Solutions Inc.Inventors: Tomofumi Shimizu, Eiichi Miyamoto, Hiroki Tsurumi
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Publication number: 20140242507Abstract: A positively chargeable single-layer electrophotographic photosensitive member includes a single-layer photosensitive layer. The single-layer photosensitive layer contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. The electron transport material contains two or more compounds selected from the group consisting of compounds represented by the chemical formulas (1) to (4) below.Type: ApplicationFiled: February 26, 2014Publication date: August 28, 2014Applicant: KYOCERA DOCUMENT SOLUTIONS INC.Inventors: Tomofumi SHIMIZU, Hiroki TSURUMI, Yohei YAMAMOTO, Eiichi MIYAMOTO
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Publication number: 20140154619Abstract: A positively chargeable monolayer electrophotographic photosensitive member includes a photosensitive layer provided on a conductive substrate and having a monolayer structure containing at least a charge generating material, a hole transport material, an electron transport material, and a binder resin. The photosensitive layer contains a hole transport material containing a triarylamine derivative represented by a formula (1) below and an electron transport material containing a compound selected from the group consisting of quinone compounds having a predetermined structure.Type: ApplicationFiled: November 26, 2013Publication date: June 5, 2014Applicant: KYOCERA DOCUMENT SOLUTIONS INC.Inventors: Tomofumi SHIMIZU, Eiichi MIYAMOTO, Hiroki TSURUMI