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).
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Publication number: 20240103393Abstract: A conductive member includes: a substrate; an elastic layer provided on the substrate; and a surface layer provided on the elastic layer, in which the surface layer contains a conductive agent and has a sea/island structure that consists of a sea portion containing a first resin and an island portion containing a second resin, and a distance R between the island portions and a radius r of the island portion in a cross-section of the surface layer satisfy the following Expression (1-1), ?0.20?R?2r?0.40.Type: ApplicationFiled: March 24, 2023Publication date: March 28, 2024Applicant: FUJIFILM Business Innovation Corp.Inventors: Kenta YAMAKOSHI, Yukimi KAWABATA
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Publication number: 20240077808Abstract: A contact charging type image forming apparatus, to which only a direct current voltage is applied, includes an electrophotographic photoreceptor that includes a conductive base material A and a photosensitive layer provided on the conductive base material A, and a charging member that includes a conductive base material B and an elastic layer provided on the conductive base material B, in which in a case where a dielectric film thickness of the electrophotographic photoreceptor is defined as L, and a resistance component of an impedance of the charging member in a range of 1 Hz or greater and 500 Hz or less, which is measured by an alternating current impedance method, is defined as R, Expression (1) is satisfied. L<?0.75×loge(R)+15.Type: ApplicationFiled: May 3, 2023Publication date: March 7, 2024Applicant: FUJIFILM Business Innovation Corp.Inventors: Yukimi KAWABATA, Kenta YAMAKOSHI, Hiroyuki MIURA
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Patent number: 11853004Abstract: 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: GrantFiled: July 13, 2021Date of Patent: December 26, 2023Assignee: FUJIFILM Business Innovation Corp.Inventors: Yukimi Kawabata, Keisuke Kusano, Hideya Katsuhara, Natsumi Kaneko
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Patent number: 11796929Abstract: 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: GrantFiled: June 4, 2021Date of Patent: October 24, 2023Assignee: FUJIFILM BUSINESS INNOVATION CORP.Inventors: Yukimi Kawabata, Natsumi Kaneko, Hideya Katsuhara
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Patent number: 11796933Abstract: 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: GrantFiled: September 8, 2022Date of Patent: October 24, 2023Assignee: FUJIFILM Business Innovation Corp.Inventors: Kenta Yamakoshi, Yukimi Kawabata, Fuyuki Kano
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Patent number: 11782355Abstract: 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: GrantFiled: September 6, 2022Date of Patent: October 10, 2023Assignee: FUJIFILM Business Innovation Corp.Inventors: Yukimi Kawabata, Fuyuki Kano, Kenta Yamakoshi
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Publication number: 20230288833Abstract: 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: ApplicationFiled: September 8, 2022Publication date: September 14, 2023Applicant: FUJIFILM Business Innovation Corp.Inventors: Kenta YAMAKOSHI, Yukimi KAWABATA, Fuyuki KANO
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Publication number: 20230229097Abstract: 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: ApplicationFiled: September 6, 2022Publication date: July 20, 2023Applicant: FUJIFILM Business Innovation Corp.Inventors: Yukimi KAWABATA, Fuyuki KANO, Kenta YAMAKOSHI
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Publication number: 20220308474Abstract: 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: ApplicationFiled: July 13, 2021Publication date: September 29, 2022Applicant: FUJIFILM Business Innovation Corp.Inventors: Yukimi KAWABATA, Keisuke KUSANO, Hideya KATSUHARA, Natsumi KANEKO
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Publication number: 20210405548Abstract: 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: ApplicationFiled: June 4, 2021Publication date: December 30, 2021Applicant: FUJIFILM BUSINESS INNOVATION CORP.Inventors: Yukimi KAWABATA, Natsumi KANEKO, Hideya KATSUHARA
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Publication number: 20190302632Abstract: 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: ApplicationFiled: July 30, 2018Publication date: October 3, 2019Applicant: FUJI XEROX CO., LTD.Inventors: Nobuyuki TORIGOE, Takeshi IWANAGA, Masaki HIRAKATA, Hideya KATSUHARA, Yoichi KIGOSHI, Yukimi KAWABATA
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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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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: 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