Patents by Inventor Yukimi KAWABATA

Yukimi KAWABATA 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).

  • Patent number: 11853004
    Abstract: An electrophotographic photoconductor includes: a conductive substrate; and a single-layer-type photoconductive layer that is provided on the conductive substrate, contains a binder resin, a charge generating material, a hole transporting material, and an electron transporting material, and has an index A represented by the following equation (1) in a range of ?7.98 or more and ?7.28 or less, Equation (1): A=(0.057×M)?(0.002×F)?(0.252×?), in which, in the equation (1), M represents a Martens hardness of the single-layer-type photoconductive layer, F represents a Young's modulus of the single-layer-type photoconductive layer, and ? represents an elastic deformation ratio of the single-layer-type photoconductive layer.
    Type: Grant
    Filed: July 13, 2021
    Date of Patent: December 26, 2023
    Assignee: FUJIFILM Business Innovation Corp.
    Inventors: Yukimi Kawabata, Keisuke Kusano, Hideya Katsuhara, Natsumi Kaneko
  • Patent number: 11796929
    Abstract: An electrophotographic photoconductor includes: a conductive substrate; and a single-layer-type photoconductive layer that is provided on the conductive substrate and contains a binder resin, a charge generating material, a hole transporting material, and an electron transporting material, in which a volume resistivity of the photoconductive layer after wear is 5.0×1010 ?·cm or more and 2.0×1011 ?·cm or less when a ratio of a thickness of the photoconductive layer after wear to a thickness of the photoconductive layer before wear (the thickness of the photoconductive layer after wear/the thickness of the photoconductive layer before wear) is 0.8.
    Type: Grant
    Filed: June 4, 2021
    Date of Patent: October 24, 2023
    Assignee: FUJIFILM BUSINESS INNOVATION CORP.
    Inventors: Yukimi Kawabata, Natsumi Kaneko, Hideya Katsuhara
  • Patent number: 11796933
    Abstract: A conductive member includes a substrate, an elastic layer on the substrate, and a surface layer on the elastic layer. The surface layer contains a conductive agent and has a sea-island structure including a sea containing a first resin and islands containing a second resin. The area occupancy of the islands in a cross section of the surface layer is 10% or more and 50% or less.
    Type: Grant
    Filed: September 8, 2022
    Date of Patent: October 24, 2023
    Assignee: FUJIFILM Business Innovation Corp.
    Inventors: Kenta Yamakoshi, Yukimi Kawabata, Fuyuki Kano
  • Patent number: 11782355
    Abstract: A charging member of a contact charging system that applies only a direct-current voltage to the charging member includes a conductive substrate, an elastic layer disposed on the conductive substrate, and a surface layer disposed on the elastic layer. When measured by an alternating-current impedance method within a range of 1 MHz to 1 mHz in an environment at a temperature of 28° C. and a humidity of 85%, a resistance component R of an impedance within a range of 1 Hz to 100 Hz is 4.0×104 ? or more and 1.0×106 ? or less and an impedance Z within a range of 1 Hz to 100 Hz is over 3.6×104 ? and 3.5×105 ? or less.
    Type: Grant
    Filed: September 6, 2022
    Date of Patent: October 10, 2023
    Assignee: FUJIFILM Business Innovation Corp.
    Inventors: Yukimi Kawabata, Fuyuki Kano, Kenta Yamakoshi
  • Publication number: 20230288833
    Abstract: A conductive member includes a substrate, an elastic layer on the substrate, and a surface layer on the elastic layer. The surface layer contains a conductive agent and has a sea-island structure including a sea containing a first resin and islands containing a second resin. The area occupancy of the islands in a cross section of the surface layer is 10% or more and 50% or less.
    Type: Application
    Filed: September 8, 2022
    Publication date: September 14, 2023
    Applicant: FUJIFILM Business Innovation Corp.
    Inventors: Kenta YAMAKOSHI, Yukimi KAWABATA, Fuyuki KANO
  • Publication number: 20230229097
    Abstract: A charging member of a contact charging system that applies only a direct-current voltage to the charging member includes a conductive substrate, an elastic layer disposed on the conductive substrate, and a surface layer disposed on the elastic layer. When measured by an alternating-current impedance method within a range of 1 MHz to 1 mHz in an environment at a temperature of 28° C. and a humidity of 85%, a resistance component R of an impedance within a range of 1 Hz to 100 Hz is 4.0×104? or more and 1.0×106? or less and an impedance Z within a range of 1 Hz to 100 Hz is over 3.6×104? and 3.5×105? or less.
    Type: Application
    Filed: September 6, 2022
    Publication date: July 20, 2023
    Applicant: FUJIFILM Business Innovation Corp.
    Inventors: Yukimi KAWABATA, Fuyuki KANO, Kenta YAMAKOSHI
  • Publication number: 20220308474
    Abstract: An electrophotographic photoconductor includes: a conductive substrate; and a single-layer-type photoconductive layer that is provided on the conductive substrate, contains a binder resin, a charge generating material, a hole transporting material, and an electron transporting material, and has an index A represented by the following equation (1) in a range of ?7.98 or more and ?7.28 or less, Equation (1): A=(0.057×M)?(0.002×F)?(0.252×?), in which, in the equation (1), M represents a Martens hardness of the single-layer-type photoconductive layer, F represents a Young's modulus of the single-layer-type photoconductive layer, and ? represents an elastic deformation ratio of the single-layer-type photoconductive layer.
    Type: Application
    Filed: July 13, 2021
    Publication date: September 29, 2022
    Applicant: FUJIFILM Business Innovation Corp.
    Inventors: Yukimi KAWABATA, Keisuke KUSANO, Hideya KATSUHARA, Natsumi KANEKO
  • Publication number: 20210405548
    Abstract: An electrophotographic photoconductor includes: a conductive substrate; and a single-layer-type photoconductive layer that is provided on the conductive substrate and contains a binder resin, a charge generating material, a hole transporting material, and an electron transporting material, in which a volume resistivity of the photoconductive layer after wear is 5.0×1010 ?·cm or more and 2.0×1011 ?·cm or less when a ratio of a thickness of the photoconductive layer after wear to a thickness of the photoconductive layer before wear (the thickness of the photoconductive layer after wear/the thickness of the photoconductive layer before wear) is 0.8.
    Type: Application
    Filed: June 4, 2021
    Publication date: December 30, 2021
    Applicant: FUJIFILM BUSINESS INNOVATION CORP.
    Inventors: Yukimi KAWABATA, Natsumi KANEKO, Hideya KATSUHARA
  • Publication number: 20190302632
    Abstract: Provided is an electrophotographic photoreceptor including: a conductive substrate; a single-layer type photosensitive layer that is provided on the conductive substrate; an inorganic protective layer that is provided on the single-layer type photosensitive layer; wherein layers that are interposed between the conductive substrate and the inorganic protective layer have a total thickness of 10 ?m to 25 ?m.
    Type: Application
    Filed: July 30, 2018
    Publication date: October 3, 2019
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Nobuyuki TORIGOE, Takeshi IWANAGA, Masaki HIRAKATA, Hideya KATSUHARA, Yoichi KIGOSHI, Yukimi KAWABATA
  • Patent number: 9829812
    Abstract: 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: Grant
    Filed: July 22, 2016
    Date of Patent: November 28, 2017
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Keisuke Kusano, Masahiro Iwasaki, Jiro Korenaga, Yukimi Kawabata
  • Patent number: 9811010
    Abstract: 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: Grant
    Filed: February 5, 2016
    Date of Patent: November 7, 2017
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Yasuhiro Niida, Kazuyuki Tada, Jiro Korenaga, Yukimi Kawabata
  • Publication number: 20170261872
    Abstract: 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: Application
    Filed: July 22, 2016
    Publication date: September 14, 2017
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Keisuke KUSANO, Masahiro IWASAKI, Jiro KORENAGA, Yukimi KAWABATA
  • Publication number: 20170052464
    Abstract: 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: Application
    Filed: February 5, 2016
    Publication date: February 23, 2017
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Yasuhiro NIIDA, Kazuyuki TADA, Jiro KORENAGA, Yukimi KAWABATA
  • Patent number: 9557662
    Abstract: 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: Grant
    Filed: September 4, 2015
    Date of Patent: January 31, 2017
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Keisuke Kusano, Jiro Korenaga, Yoshifumi Shoji, Yukimi Kawabata
  • Patent number: 9551945
    Abstract: 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: Grant
    Filed: July 29, 2015
    Date of Patent: January 24, 2017
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Yukimi Kawabata, Kazuyuki Tada, Jiro Korenaga, Yasuhiro Niida
  • Publication number: 20160282734
    Abstract: 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: Application
    Filed: September 4, 2015
    Publication date: September 29, 2016
    Inventors: Keisuke KUSANO, Jiro KORENAGA, Yoshifumi SHOJI, Yukimi KAWABATA
  • Publication number: 20160246190
    Abstract: 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: Application
    Filed: July 29, 2015
    Publication date: August 25, 2016
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Yukimi KAWABATA, Kazuyuki TADA, Jiro KORENAGA, Yasuhiro NIIDA
  • Patent number: 9335644
    Abstract: 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: Grant
    Filed: February 9, 2015
    Date of Patent: May 10, 2016
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Masahiro Iwasaki, Shinya Yamamoto, Jiro Korenaga, Daisuke Haruyama, Yukimi Kawabata, Keisuke Kusano, Kenta Shingu, Yoshifumi Shoji
  • Publication number: 20160085164
    Abstract: 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: Application
    Filed: February 9, 2015
    Publication date: March 24, 2016
    Inventors: Masahiro IWASAKI, Shinya YAMAMOTO, Jiro KORENAGA, Daisuke HARUYAMA, Yukimi KAWABATA, Keisuke KUSANO, Kenta SHINGU, Yoshifumi SHOJI
  • Patent number: 8790854
    Abstract: An electrophotographic photoreceptor includes a substrate and a photosensitive layer, wherein the electrophotographic photoreceptor has a surface layer containing fluorine resin particles, and the fluorine resin particles exposed on a surface satisfy the following Expression (1): 0.5?(A)/(B)?10??Expression (1) wherein, (A) represents a number of aggregated particles in which 5 to 20 fluorine resin particles are connected and aggregated, and (B) represents a total number of fluorine resin particles that are isolated without being aggregated and aggregated particles in which 2 to 4 fluorine resin particles are connected and aggregated.
    Type: Grant
    Filed: September 28, 2012
    Date of Patent: July 29, 2014
    Assignee: Fuji Xerox Co., Ltd.
    Inventor: Yukimi Kawabata