Patents by Inventor Jiro KORENAGA
Jiro KORENAGA 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: 11921455Abstract: A lubricant solid contains, in a content of 92 mass % or more and 100 mass % or less, a lubricant having a polygonal network bond structure.Type: GrantFiled: September 8, 2022Date of Patent: March 5, 2024Assignee: FUJIFILM Business Innovation Corp.Inventors: Yohei Saito, Jiro Korenaga, Shoko Hachiya, Ryo Sekiguchi
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Patent number: 11880162Abstract: An electrophotographic photoreceptor includes a conductive substrate, an undercoat layer on the conductive substrate, a charge generation layer on the undercoat layer, a charge transport layer on the charge generation layer, and an inorganic protection layer on the charge transport layer, in which the charge transport layer contains a binder resin and a charge transport material, and, when impedance of the charge transport layer is measured, a ratio (C1Hz/C10Hz) of an electrostatic capacitance C1Hz at 1 Hz to an electrostatic capacitance C10Hz at 10 Hz is 1.1 or less.Type: GrantFiled: September 19, 2022Date of Patent: January 23, 2024Assignee: FUJIFILM Business Innovation Corp.Inventors: Yoichi Kigoshi, Michinori Fukuma, Ryota Kaneko, Jiro Korenaga
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Publication number: 20230280689Abstract: A lubricant solid contains, in a content of 92 mass% or more and 100 mass% or less, a lubricant having a polygonal network bond structure.Type: ApplicationFiled: September 8, 2022Publication date: September 7, 2023Applicant: FUJIFILM Business Innovation Corp.Inventors: Yohei SAITO, Jiro KORENAGA, Shoko HACHIYA, Ryo SEKIGUCHI
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Publication number: 20230114544Abstract: An electrophotographic photoreceptor includes a conductive substrate, an undercoat layer on the conductive substrate, a charge generation layer on the undercoat layer, a charge transport layer on the charge generation layer, and an inorganic protection layer on the charge transport layer, in which the charge transport layer contains a binder resin and a charge transport material, and, when impedance of the charge transport layer is measured, a ratio (C1 Hz/C10 Hz) of an electrostatic capacitance C1 Hz at 1 Hz to an electrostatic capacitance C10 Hz at 10 Hz is 1.1 or less.Type: ApplicationFiled: September 19, 2022Publication date: April 13, 2023Applicant: FUJIFILM Business Innovation Corp.Inventors: Yoichi Kigoshi, Michinori Fukuma, Ryota Kaneko, Jiro Korenaga
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Publication number: 20220308475Abstract: An electrophotographic photoconductor includes a conductive substrate, and a photoconductive layer, in which an outermost surface layer contains a binder resin, a charge transporting material, fluorine-containing resin particles, and an acidic compound, the number of carboxyl groups in the fluorine-containing resin particles is 0 or more and 30 or less per 106 carbon atoms of the fluorine-containing resin particles, and in a case where charging and exposure of the electrophotographic photoconductor are repeated 10,000 times under conditions of a charging potential of ?700 V and an exposure intensity of 5 mJ/m2, an absolute value |RP1?RP10000| of a difference between a residual potential RP1 after charging and exposure once and a residual potential RP10000 after charging and exposure 10,000 times is 25 V or less.Type: ApplicationFiled: August 9, 2021Publication date: September 29, 2022Applicant: FUJIFILM Business Innovation Corp.Inventors: Jiro KORENAGA KORENAGA, Shuhei Yamazaki, Satoshi Mizoguchi, Yoichi Kigoshi, Michinori Fukuma, Kosuke Narita, Masahiro Iwasaki, Keisuke Kusano
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Patent number: 9829812Abstract: An electrophotographic photoreceptor includes a conductive substrate and a single-layer-type photosensitive layer on the conductive substrate. The single-layer-type photosensitive layer contains a binder resin, a charge generating material, an electron transporting material, and a hole transporting material. The single-layer-type photosensitive layer has a concentration ratio (A/B) of 0.7 or more and 1.0 or less, where the concentration ratio (A/B) is a ratio of a concentration A of the electron transporting material relative to the binder resin measured from a surface of the photosensitive layer remote from the conductive substrate to a concentration B of the electron transporting material relative to the binder resin measured from a surface of the photosensitive layer close to the conductive substrate.Type: GrantFiled: July 22, 2016Date of Patent: November 28, 2017Assignee: FUJI XEROX CO., LTD.Inventors: Keisuke Kusano, Masahiro Iwasaki, Jiro Korenaga, Yukimi Kawabata
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Patent number: 9811010Abstract: An electrophotographic photosensitive member includes a conductive base and a single-layer-type photosensitive layer on the conductive base. The photosensitive layer contains a binder resin, a charge generation material, a hole transport material, a fluorine-atom-containing electron transport material, and fluorine-atom-containing resin particles. An amount of the charge generation material in the photosensitive layer is 0.5% by weight or more and less than 2.0% by weight. The charge generation material has a distribution that satisfies Formula (1): 30?a/b in a thickness direction of the photosensitive layer where a and b are as defined in the specification, and b may be 0. The fluorine-atom-containing electron transport material has a distribution that satisfies Formula (2): 30?c/d in the thickness direction of the photosensitive layer where c and d are as defined in the specification, and d may be 0.Type: GrantFiled: February 5, 2016Date of Patent: November 7, 2017Assignee: FUJI XEROX CO., LTD.Inventors: Yasuhiro Niida, Kazuyuki Tada, Jiro Korenaga, Yukimi Kawabata
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Publication number: 20170261872Abstract: An electrophotographic photoreceptor includes a conductive substrate and a single-layer-type photosensitive layer on the conductive substrate. The single-layer-type photosensitive layer contains a binder resin, a charge generating material, an electron transporting material, and a hole transporting material. The single-layer-type photosensitive layer has a concentration ratio (A/B) of 0.7 or more and 1.0 or less, where the concentration ratio (A/B) is a ratio of a concentration A of the electron transporting material relative to the binder resin measured from a surface of the photosensitive layer remote from the conductive substrate to a concentration B of the electron transporting material relative to the binder resin measured from a surface of the photosensitive layer close to the conductive substrate.Type: ApplicationFiled: July 22, 2016Publication date: September 14, 2017Applicant: FUJI XEROX CO., LTD.Inventors: Keisuke KUSANO, Masahiro IWASAKI, Jiro KORENAGA, Yukimi KAWABATA
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Publication number: 20170052464Abstract: An electrophotographic photosensitive member includes a conductive base and a single-layer-type photosensitive layer on the conductive base. The photosensitive layer contains a binder resin, a charge generation material, a hole transport material, a fluorine-atom-containing electron transport material, and fluorine-atom-containing resin particles. An amount of the charge generation material in the photosensitive layer is 0.5% by weight or more and less than 2.0% by weight. The charge generation material has a distribution that satisfies Formula (1): 30?a/b in a thickness direction of the photosensitive layer where a and b are as defined in the specification, and b may be 0. The fluorine-atom-containing electron transport material has a distribution that satisfies Formula (2): 30?c/d in the thickness direction of the photosensitive layer where c and d are as defined in the specification, and d may be 0.Type: ApplicationFiled: February 5, 2016Publication date: February 23, 2017Applicant: FUJI XEROX CO., LTD.Inventors: Yasuhiro NIIDA, Kazuyuki TADA, Jiro KORENAGA, Yukimi KAWABATA
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Patent number: 9557662Abstract: An electrophotographic photoreceptor includes a conductive substrate and a single-layer photosensitive layer which is provided on the conductive substrate and contains a binder resin, at least one charge generating material selected from a hydroxygallium phthalocyanine pigment and a chlorogallium phthalocyanine pigment, a first electron transporting material defined in the specification, a second electron transporting material defined in the specification, and a hole transporting material defined in the specification, wherein a total content of all electron transporting materials is greater than or equal to 4 parts by weight with respect to 100 parts by weight of a total solid content of the photosensitive layer, and an average loss elastic modulus E? of the photosensitive layer, which is obtained by measuring dynamic viscoelasticity at a temperature of from 35° C. to 50° C. and a frequency of 0.5 Hz, is less than or equal to 1.000×106.Type: GrantFiled: September 4, 2015Date of Patent: January 31, 2017Assignee: FUJI XEROX CO., LTD.Inventors: Keisuke Kusano, Jiro Korenaga, Yoshifumi Shoji, Yukimi Kawabata
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Patent number: 9551945Abstract: An electrophotographic photoreceptor includes a conductive substrate, and a single-layer type photosensitive layer that contains a binder resin, a charge generating material, a hole transporting material, and an electron transporting material, wherein a content of the charge generating material in the photosensitive layer is 0.5% by weight or more and less than 2.0% by weight and the charge generating material satisfies expression (1): 30?a/b, wherein a represents the number of the charge generating materials per unit cross-sectional area in a region ranging from the surface side of the film thickness of the photosensitive layer to a point corresponding to ?, and b represents the number of the charge generating materials per unit cross-sectional area in a region ranging from the conductive substrate side of the film thickness of the photosensitive layer to a position corresponding to ?, provided that a case where b is 0 is included.Type: GrantFiled: July 29, 2015Date of Patent: January 24, 2017Assignee: FUJI XEROX CO., LTD.Inventors: Yukimi Kawabata, Kazuyuki Tada, Jiro Korenaga, Yasuhiro Niida
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Patent number: 9459543Abstract: An electrophotographic photoreceptor includes a conductive substrate and a singlelayer type photosensitive layer which is provided on the conductive substrate and contains a binder resin, a charge generating material, a hole transporting material, an electron transporting material represented by the formula (1), and a fluorenone compound represented by the formula (2): wherein R11, R12, R13, R14, R15, R16, R17 each independently represent a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, an aryl group, or an aralkyl group, and R18 represents an alkyl group, an aryl group, or an aralkyl group; and wherein R21, R22, R23, R24, R26, R27, and R28 each independently represent a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, an aryl group, or an aralkyl group, and R25 represents a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, an aryl group, or an aralkyl group.Type: GrantFiled: August 26, 2015Date of Patent: October 4, 2016Assignee: FUJI XEROX CO., LTD.Inventors: Jiro Korenaga, Yoshifumi Shoji
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Publication number: 20160282734Abstract: An electrophotographic photoreceptor includes a conductive substrate and a single-layer photosensitive layer which is provided on the conductive substrate and contains a binder resin, at least one charge generating material selected from a hydroxygallium phthalocyanine pigment and a chlorogallium phthalocyanine pigment, a first electron transporting material defined in the specification, a second electron transporting material defined in the specification, and a hole transporting material defined in the specification, wherein a total content of all electron transporting materials is greater than or equal to 4 parts by weight with respect to 100 parts by weight of a total solid content of the photosensitive layer, and an average loss elastic modulus E? of the photosensitive layer, which is obtained by measuring dynamic viscoelasticity at a temperature of from 35° C. to 50° C. and a frequency of 0.5 Hz, is less than or equal to 1.000×106.Type: ApplicationFiled: September 4, 2015Publication date: September 29, 2016Inventors: Keisuke KUSANO, Jiro KORENAGA, Yoshifumi SHOJI, Yukimi KAWABATA
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Publication number: 20160282733Abstract: An electrophotographic photoreceptor includes a conductive substrate and a singlelayer type photosensitive layer which is provided on the conductive substrate and contains a binder resin, a charge generating material, a hole transporting material, an electron transporting material represented by the formula (1), and a fluorenone compound represented by the formula (2): wherein R11, R12, R13, R14, R15, R16, R17 each independently represent a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, an aryl group, or an aralkyl group, and R18 represents an alkyl group, an aryl group, or an aralkyl group; and wherein R21, R22, R23, R24, R26, R27, and R28 each independently represent a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, an aryl group, or an aralkyl group, and R25 represents a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, an aryl group, or an aralkyl group.Type: ApplicationFiled: August 26, 2015Publication date: September 29, 2016Inventors: Jiro KORENAGA, Yoshifumi SHOJI
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Patent number: 9429864Abstract: A charging member includes a conductive support and a surface layer provided on the conductive support, wherein electron emitting energy on a surface of the charging member is equal to or less than 10 cps0.5/eV.Type: GrantFiled: October 8, 2015Date of Patent: August 30, 2016Assignee: FUJI XEROX CO., LTD.Inventors: Hiroyuki Miura, Takuya Morishige, Yoshiteru Yamada, Takuro Hoshio, Kosuke Narita, Jiro Korenaga
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Publication number: 20160246190Abstract: An electrophotographic photoreceptor includes a conductive substrate, and a single-layer type photosensitive layer that contains a binder resin, a charge generating material, a hole transporting material, and an electron transporting material, wherein a content of the charge generating material in the photosensitive layer is 0.5% by weight or more and less than 2.0% by weight and the charge generating material satisfies expression (1): 30?a/b, wherein a represents the number of the charge generating materials per unit cross-sectional area in a region ranging from the surface side of the film thickness of the photosensitive layer to a point corresponding to ?, and b represents the number of the charge generating materials per unit cross-sectional area in a region ranging from the conductive substrate side of the film thickness of the photosensitive layer to a position corresponding to ?, provided that a case where b is 0 is included.Type: ApplicationFiled: July 29, 2015Publication date: August 25, 2016Applicant: FUJI XEROX CO., LTD.Inventors: Yukimi KAWABATA, Kazuyuki TADA, Jiro KORENAGA, Yasuhiro NIIDA
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Patent number: 9335644Abstract: Provided is an electron transport material represented by formula (1): wherein X represents an oxygen atom or ?C(CN)2; R1, R2, R3, R4, R5, R6, and R7 each independently represent a hydrogen atom, a halogen atom, a linear or branched alkyl group, an alkoxy group, an aryl group, or an aralkyl group; R8, R9, and R10 each independently represent a hydrogen atom, a halogen atom, a linear or branched alkyl group, an aralkyl group, an aryl group, —R11—O—R12, or —R13—CO—O—R14; R11 represents a linear or branched alkylene group; R12 represents a linear or branched alkyl group; R13 represents a single bond or a linear or branched alkylene group; and R14 represents a linear or branched alkyl group, an aryl group, or an aralkyl group, provided that at least two or more groups of R8, R9, and R10 represent a group other than a hydrogen atom.Type: GrantFiled: February 9, 2015Date of Patent: May 10, 2016Assignee: FUJI XEROX CO., LTD.Inventors: Masahiro Iwasaki, Shinya Yamamoto, Jiro Korenaga, Daisuke Haruyama, Yukimi Kawabata, Keisuke Kusano, Kenta Shingu, Yoshifumi Shoji
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Publication number: 20160085164Abstract: Provided is an electron transport material represented by formula (1): wherein X represents an oxygen atom or ?C(CN)2; R1, R2, R3, R4, R5, R6, and R7 each independently represent a hydrogen atom, a halogen atom, a linear or branched alkyl group, an alkoxy group, an aryl group, or an aralkyl group; R8, R9, and R10 each independently represent a hydrogen atom, a halogen atom, a linear or branched alkyl group, an aralkyl group, an aryl group, —R11—O—R12, or —R13—CO—O—R14; R11 represents a linear or branched alkylene group; R12 represents a linear or branched alkyl group; R13 represents a single bond or a linear or branched alkylene group; and R14 represents a linear or branched alkyl group, an aryl group, or an aralkyl group, provided that at least two or more groups of R8, R9, and R10 represent a group other than a hydrogen atom.Type: ApplicationFiled: February 9, 2015Publication date: March 24, 2016Inventors: Masahiro IWASAKI, Shinya YAMAMOTO, Jiro KORENAGA, Daisuke HARUYAMA, Yukimi KAWABATA, Keisuke KUSANO, Kenta SHINGU, Yoshifumi SHOJI
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Patent number: 9280079Abstract: A charging member includes a conductive base material and a conductive outermost layer provided on the conductive base material, wherein the conductive outermost layer has a ten-point average surface roughness Rz of 2 ?m to 20 ?m and contains a resin and particles in which particles having a particle diameter of 5.0 ?m or more and a circularity of 0.8 or less are 30% by number or less with respect to the total number of particles having a particle diameter of 5.0 ?m or more and particles having a particle diameter of less than 5.0 ?m and a circularity of 0.8 or less are from 20% by number to 80% by number with respect to the total number of particles having a particle diameter of less than 5.0 ?m.Type: GrantFiled: September 4, 2015Date of Patent: March 8, 2016Assignee: FUJI XEROX CO., LTD.Inventors: Takuro Hoshio, Taketoshi Hoshizaki, Hiroyuki Miura, Kosuke Narita, Jiro Korenaga, Yasuhiro Niida, Yoshiyuki Hayashi, Yasuhiko Kinuta
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Publication number: 20150268568Abstract: An electrophotographic photoreceptor includes a conductive substrate, and a singlelayer type photosensitive layer that contains a binder resin (A), a charge generating material (B), a positive hole transporting material (C), an electron transporting material (D) whose content is in a range of 10% by weight to 40% by weight with respect to the binder resin (A) and which is represented by the following formula (d), and a terphenyl compound (E): wherein in the formula (d), Rd1, Rd2, Rd3, Rd4, Rd5, Rd6, and Rd7 each independently represent a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, an aralkyl group, or an aryl group; and Rd8 represents an aralkyl group or an alkyl group.Type: ApplicationFiled: December 29, 2014Publication date: September 24, 2015Applicant: FUJI XEROX CO., LTD.Inventors: Yoshifumi SHOJI, Masahiro IWASAKI, Jiro KORENAGA