Patents by Inventor Jun Azuma
Jun Azuma 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: 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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Patent number: 9964869Abstract: A triarylamine derivative represented by general formula (1) below. In the general formula (1), R1, R2, R4, R5, R6, R7, R8, and R9 each represent, independently from one another, a hydrogen atom, an optionally substitute alkyl group having a carbon number of at least 1 and no greater than 6, an optionally substituted alkoxy group having a carbon number of at least 1 and no greater than 6, or an optionally substituted aryl group having a carbon number of at least 6 and no greater than 14, R3 represents an alkyl group having a carbon number of at least 1 and no greater than 4, X represents an alkylene group having a carbon number of at least 1 and no greater than 6 or an oxygen atom, and n represents an integer of 1 to 3.Type: GrantFiled: November 8, 2016Date of Patent: May 8, 2018Assignee: KYOCERA Document Solutions Inc.Inventors: Kensuke Okawa, Hideki Okada, Jun Azuma, Fumio Sugai, Kensuke Kojima
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Patent number: 9939744Abstract: A multi-layer 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 charge transport material, a binder resin, and silica particles. The charge transport layer is a monolayer. The charge transport layer is disposed as an outermost surface layer of the multi-layer electrophotographic photosensitive member. The silica particles have a content of at least 0.5 parts by mass and no greater than 15 parts by mass relative to 100 parts by mass of the binder resin. The binder resin includes a polyarylate resin. The polyarylate resin has a repeating unit represented by general formula (I) shown below. In general formula (I), R1-R3 and Y are defined as those described in the specification.Type: GrantFiled: September 1, 2016Date of Patent: April 10, 2018Assignee: KYOCERA Document Solutions Inc.Inventors: Jun Azuma, Kensuke Okawa, Junichiro Otsubo, Akihiko Ogata
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Patent number: 9933712Abstract: A multi-layer 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 generating material contains a titanyl phthalocyanine that exhibits a main peak at a Bragg angle (2?±0.2°) of 27.2° in a CuK? characteristic X-ray diffraction spectrum. The hole transport material contains a triarylamine derivative represented by generic formula (1). The hole transport material has a mass ratio of at least 0.30 and no greater than 0.55 relative to the binder resin in the charge transport layer. In general formula (1), R1, R2, l, and m are the same as those defined in the specification.Type: GrantFiled: August 25, 2016Date of Patent: April 3, 2018Assignee: KYOCERA Document Solutions Inc.Inventors: Akihiko Ogata, Hideki Okada, Jun Azuma, Kensuke Okawa
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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: 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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Patent number: 9829811Abstract: An 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, and a binder resin. The hole transport material is a compound represented by the following general formula (1). The binder resin is a resin represented by the following general formula (2). In general formula (1), R1 and R3 each independently represent an alkyl group, an aryl group, an aralkyl group, or an alkoxy group; and R2 and R4 each independently represent an alkyl group, or an alkoxy group. In general formula (2), R23, R24, and R25 each independently represent a hydrogen atom, or a C1-4 alkyl group, at least one of R23, R24, and R25 representing a C1-4 alkyl group; p+q=1.00, and 0.35?p<1.00; and n represents 2 or 3.Type: GrantFiled: June 28, 2016Date of Patent: November 28, 2017Assignee: KYOCERA Document Solutions Inc.Inventors: Jun Azuma, Takahiro Oki, Keiji Maruo
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Publication number: 20170307989Abstract: An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The photosensitive layer contains at least a charge generating material, a charge transport material, and a binder resin. The binder resin includes a polyarylate resin. The polyarylate resin is represented by general formula (1) shown below. In general formula (1), X represents a divalent group represented by chemical formula (1-1), (1-2), (1-3), or (1-4) shown below.Type: ApplicationFiled: April 20, 2017Publication date: October 26, 2017Applicant: KYOCERA Document Solutions Inc.Inventors: Jun AZUMA, Takahiro OKI, Kensuke OKAWA, Akihiko OGATA
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Publication number: 20170131647Abstract: A triarylamine derivative represented by general formula (1) below. In the general formula (1), R1, R2, R4, R5, R6, R7, R8, and R9 each represent, independently from one another, a hydrogen atom, an optionally substitute alkyl group having a carbon number of at least 1 and no greater than 6, an optionally substituted alkoxy group having a carbon number of at least 1 and no greater than 6, or an optionally substituted aryl group having a carbon number of at least 6 and no greater than 14, R3 represents an alkyl group having a carbon number of at least 1 and no greater than 4, X represents an alkylene group having a carbon number of at least 1 and no greater than 6 or an oxygen atom, and n represents an integer of 1 to 3.Type: ApplicationFiled: November 8, 2016Publication date: May 11, 2017Applicant: KYOCERA Document Solutions Inc.Inventors: Kensuke OKAWA, Hideki OKADA, Jun AZUMA, Fumio SUGAI, Kensuke KOJIMA
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Publication number: 20170068178Abstract: A multi-layer 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 charge transport material, a binder resin, and silica particles. The charge transport layer is a monolayer. The charge transport layer is disposed as an outermost surface layer of the multi-layer electrophotographic photosensitive member. The silica particles have a content of at least 0.5 parts by mass and no greater than 15 parts by mass relative to 100 parts by mass of the binder resin. The binder resin includes a polyarylate resin. The polyarylate resin has a repeating unit represented by general formula (I) shown below. In general formula (I), R1-R3 and Y are defined as those described in the specification.Type: ApplicationFiled: September 1, 2016Publication date: March 9, 2017Applicant: KYOCERA Document Solutions Inc.Inventors: Jun AZUMA, Kensuke OKAWA, Junichiro OTSUBO, Akihiko OGATA
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Publication number: 20170060006Abstract: A multi-layer 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 generating material contains a titanyl phthalocyanine that exhibits a main peak at a Bragg angle (2?±0.2°) of 27.2° in a CuK? characteristic X-ray diffraction spectrum. The hole transport material contains a triarylamine derivative represented by generic formula (1). The hole transport material has a mass ratio of at least 0.30 and no greater than 0.55 relative to the binder resin in the charge transport layer. In general formula (1), R1, R2, l, and m are the same as those defined in the specification.Type: ApplicationFiled: August 25, 2016Publication date: March 2, 2017Applicant: KYOCERA Document Solutions Inc.Inventors: Akihiko OGATA, Hideki OKADA, Jun AZUMA, Kensuke OKAWA
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Patent number: 9575423Abstract: An electrophotographic photosensitive member has a photosensitive layer. The photosensitive layer is a multi-layer photosensitive layer having a charge transport layer being an outermost layer or a single-layer photosensitive layer. The amount of silica particles contained in the photosensitive layer is at least 0.5 parts by mass and no greater than 15 parts by mass relative to 100 parts by mass of a binder resin contained in the photosensitive layer.Type: GrantFiled: March 6, 2015Date of Patent: February 21, 2017Assignee: KYOCERA Document Solutions Inc.Inventors: Jun Azuma, Kensuke Okawa, Akihiko Ogata, Takahiro Oki
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Publication number: 20170003608Abstract: An 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, and a binder resin. The hole transport material is a compound represented by the following general formula (1). The binder resin is a resin represented by the following general formula (2). In general formula (1), R1 and R3 each independently represent an alkyl group, an aryl group, an aralkyl group, or an alkoxy group; and R2 and R4 each independently represent an alkyl group, or an alkoxy group. In general formula (2), R23, R24, and R25 each independently represent a hydrogen atom, or a C1-4 alkyl group, at least one of R23, R24, and R25 representing a C1-4 alkyl group; p+q=1.00, and 0.35?p<1,00; and n represents 2 or 3.Type: ApplicationFiled: June 28, 2016Publication date: January 5, 2017Applicant: KYOCERA Document Solutions Inc.Inventors: Jun AZUMA, Takahiro OKI, Keiji MARUO
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Patent number: 9448496Abstract: 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 located on the charge generating layer. The charge transport layer contains a pigment that is absorptive with respect to a wavelength of exposed light. The pigment is a metal phthalocyanine pigment represented by General Formula (I) or a metal-free phthalocyanine pigment represented by General Formula (II), where X represents a sulfur atom or an oxygen atom. R1 represents an aryl group or an alkyl group. R2-R4 each represent a hydrogen atom, an alkyl group, an aryl group, an alkoxy group, a phenoxy group, an alkylthio group, a phenylthio group, or a dialkylamino group. M represents a metal atom. Y represents non-substitution or an alkyl group, an alkoxy group, an aryloxy group, a halogen atom, an oxygen atom, or a hydroxyl group.Type: GrantFiled: May 22, 2015Date of Patent: September 20, 2016Assignee: KYOCERA Document Solutions Inc.Inventors: Jun Azuma, Keiji Maruo, Kensuke Okawa, Akihiko Ogata
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Patent number: 9436104Abstract: 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 hole transport material contains an amine stilbene derivative represented by a general formula (1), and the binder resin contains a polycarbonate resin represented by a general formula (2).Type: GrantFiled: May 28, 2014Date of Patent: September 6, 2016Assignee: KYOCERA Document Solutions Inc.Inventors: Jun Azuma, Keiji Maruo, Kensuke Okawa, Akihiko Ogata
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Patent number: 9429859Abstract: An electrophotographic photosensitive member includes a photosensitive layer that contains a charge generating material, a hole transport material, a binder resin, and a plasticizer. The hole transport material contains a triarylamine derivative represented by General Formula (1) below. The plasticizer contains at least one of a compound represented by General Formula (2a) and a compound represented by General Formula (2b) below.Type: GrantFiled: September 25, 2014Date of Patent: August 30, 2016Assignee: KYOCERA Document Solutions, Inc.Inventors: Jun Azuma, Hideki Okada
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Publication number: 20150338754Abstract: 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 located on the charge generating layer. The charge transport layer contains a pigment that is absorptive with respect to a wavelength of exposed light. The pigment is a metal phthalocyanine pigment represented by General Formula (I) or a metal-free phthalocyanine pigment represented by General Formula (II), where X represents a sulfur atom or an oxygen atom. R1 represents an aryl group or an alkyl group. R2-R4 each represent a hydrogen atom, an alkyl group, an aryl group, an alkoxy group, a phenoxy group, an alkylthio group, a phenylthio group, or a dialkylamino group. M represents a metal atom. Y represents non-substitution or an alkyl group, an alkoxy group, an aryloxy group, a halogen atom, an oxygen atom, or a hydroxyl group.Type: ApplicationFiled: May 22, 2015Publication date: November 26, 2015Applicant: KYOCERA Document Solutions Inc.Inventors: Jun AZUMA, Keiji MARUO, Kensuke OKAWA, Akihiko OGATA
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Publication number: 20150261106Abstract: An electrophotographic photosensitive member includes a photosensitive layer. The photosensitive layer is a single-layer photosensitive layer or a multi-layer photosensitive layer having a charge transport layer as an outermost layer. Silica particles are contained in the photosensitive layer in an amount of no less than 0.5 parts by mass and no greater than 15 parts by mass relative to 100 parts by mass of a binder resin. The binder resin includes a polycarbonate resin represented by the general formula (1a) or the general formula (1b).Type: ApplicationFiled: March 12, 2015Publication date: September 17, 2015Applicant: KYOCERA DOCUMENT SOLUTIONS INC.Inventors: Jun AZUMA, Kensuke OKAWA, Akihiko OGATA, Takahiro OKI
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Publication number: 20150253682Abstract: An electrophotographic photosensitive member has a photosensitive layer. The photosensitive layer is a multi-layer photosensitive layer having a charge transport layer being an outermost layer or a single-layer photosensitive layer. The amount of silica particles contained in the photosensitive layer is at least 0.5 parts by mass and no greater than 15 parts by mass relative to 100 parts by mass of a binder resin contained in the photosensitive layer.Type: ApplicationFiled: March 6, 2015Publication date: September 10, 2015Applicant: KYOCERA DOCUMENT SOLUTIONS INC.Inventors: Jun AZUMA, Kensuke OKAWA, Akihiko OGATA, Takahiro OKI