Patents by Inventor Eiichi Hamana

Eiichi Hamana 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: 11906913
    Abstract: An electrophotographic belt having a layered structure with excellent scratch resistance and excellent adhesion of layers to each other. The electrophotographic belt includes a first layer and a second layer directly covering any one of the inner peripheral surface and the outer peripheral surface of the first layer, the first layer containing a first polyester resin, and the second layer containing a second polyester resin and an acrylic resin that contains a carboxy group in its molecule.
    Type: Grant
    Filed: April 11, 2022
    Date of Patent: February 20, 2024
    Assignee: Canon Kabushiki Kaisha
    Inventors: Eiichi Hamana, Kouichi Uchida
  • Patent number: 11656564
    Abstract: An image forming apparatus includes an endless belt including a base layer and an electroconductive layer positioned on an inner peripheral surface side of base layer and forming an inner peripheral surface of the belt, and a roller provided on the inner peripheral surface side of the belt and including a roller portion around which the belt is wound and which is formed of a metal material. The electroconductive layer contains a binder resin, an electroconductive agent, and a copper compound, and has surface resistivity of 5.0×106?/? or less. The roller portion includes a base material of a first metal material comprising a first metal, and a coating layer which forms a surface contacting the electroconductive layer formed of a second metal material comprising a second metal. A difference in standard potential between the second metal and copper is smaller than that between the first metal and copper.
    Type: Grant
    Filed: July 21, 2022
    Date of Patent: May 23, 2023
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Shohei Ishio, Keisuke Ishizumi, Shinji Katagiri, Eiichi Hamana, Noriaki Egawa
  • Publication number: 20220357686
    Abstract: An image forming apparatus includes an endless belt including a base layer and an electroconductive layer positioned on an inner peripheral surface side of the belt than the base layer and forming an inner peripheral surface of the belt, and a roller provided on the inner peripheral surface side of the belt and including a roller portion around which the belt is wound and which is formed of an aluminum material. The electroconductive layer contains a binder resin, an electroconductive agent, and a copper compound, and has surface resistivity of 5.0×106?/? or less. The roller includes an alumite layer forming a surface contacting the electroconductive layer.
    Type: Application
    Filed: July 21, 2022
    Publication date: November 10, 2022
    Inventors: Shohei Ishio, Keisuke Ishizumi, Shinji Katagiri, Eiichi Hamana, Noriaki Egawa
  • Patent number: 11435680
    Abstract: An image forming apparatus includes an endless belt including a base layer and an electroconductive layer positioned on an inner peripheral surface side of the belt than the base layer and forming an inner peripheral surface of the belt, and a roller provided on the inner peripheral surface side of the belt and including a roller portion around which the belt is wound and which is formed of an aluminum material. The electroconductive layer contains a binder resin, an electroconductive agent, and a copper compound, and has surface resistivity of 5.0×106?Q/? or less. The roller includes an alumite layer forming a surface contacting the electroconductive layer.
    Type: Grant
    Filed: October 12, 2021
    Date of Patent: September 6, 2022
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Shohei Ishio, Keisuke Ishizumi, Shinji Katagiri, Eiichi Hamana, Noriaki Egawa
  • Publication number: 20220244664
    Abstract: Providcd is anAn electrophotographic belt having a layered structure with excellent scratch resistance and excellent adhesion of layers to each other. The electrophotographic belt includes a first layer and a second layer directly covering any one of the inner peripheral surface and the outer peripheral surface of the first layer, the first layer containing a first polyester resin, and the second layer containing a second polyester resin and an acrylic resin that contains a carboxy group in its molecule.
    Type: Application
    Filed: April 11, 2022
    Publication date: August 4, 2022
    Inventors: Eiichi Hamana, Kouichi Uchida
  • Publication number: 20220146967
    Abstract: An image forming apparatus includes an endless belt including a base layer and an electroconductive layer positioned on an inner peripheral surface side of the belt than the base layer and forming an inner peripheral surface of the belt, and a roller provided on the inner peripheral surface side of the belt and including a roller portion around which the belt is wound and which is formed of an aluminum material. The electroconductive layer contains a binder resin, an electroconductive agent, and a copper compound, and has surface resistivity of 5.0×106?Q/? or less. The roller includes an alumite layer forming a surface contacting the electroconductive layer.
    Type: Application
    Filed: October 12, 2021
    Publication date: May 12, 2022
    Inventors: Shohei Ishio, Keisuke Ishizumi, Shinji Katagiri, Eiichi Hamana, Noriaki Egawa
  • Patent number: 11143987
    Abstract: An intermediate transfer belt includes a base layer that has ionic conductivity and is a thickest layer out of multiple layers making up the intermediate transfer belt with respect to the thickness direction of the intermediate transfer belt, and an inner layer having electronic conductivity and a lower electrical resistance than the base layer.
    Type: Grant
    Filed: November 2, 2018
    Date of Patent: October 12, 2021
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Tsuguhiro Yoshida, Masaru Shimura, Shinji Katagiri, Eiichi Hamana, Takahiro Ikeda, Takayuki Tanaka, Shuichi Tetsuno
  • Patent number: 10866543
    Abstract: An electrophotographic belt including an electro-conductive layer having high adhesion to a base layer while maintaining high electro-conductivity. The electrophotographic belt has an endless shape, and includes an endless shaped base layer containing a polyester resin, and an electro-conductive layer covering an inner surface of the base layer, the electro-conductive layer containing an electro-conductive particle and a binder resin, and the binder resin containing a polyester resin having at least two monomer units of phthalic acids selected from the group consisting of terephthalic acid, orthophthalic acid and isophthalic acid.
    Type: Grant
    Filed: May 7, 2020
    Date of Patent: December 15, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Eiichi Hamana, Noriaki Egawa, Kouichi Uchida
  • Publication number: 20200363756
    Abstract: An electrophotographic belt including an electro-conductive layer having high adhesion to a base layer while maintaining high electro-conductivity. The electrophotographic belt has an endless shape, and includes an endless shaped base layer containing a polyester resin, and an electro-conductive layer covering an inner surface of the base layer, the electro-conductive layer containing an electro-conductive particle and a binder resin, and the binder resin containing a polyester resin having at least two monomer units of phthalic acids selected from the group consisting of terephthalic acid, orthophthalic acid and isophthalic acid.
    Type: Application
    Filed: May 7, 2020
    Publication date: November 19, 2020
    Inventors: Eiichi Hamana, Noriaki Egawa, Kouichi Uchida
  • Publication number: 20190072880
    Abstract: An intermediate transfer belt includes a base layer that has ionic conductivity and is a thickest layer out of multiple layers making up the intermediate transfer belt with respect to the thickness direction of the intermediate transfer belt, and an inner layer having electronic conductivity and a lower electrical resistance than the base layer.
    Type: Application
    Filed: November 2, 2018
    Publication date: March 7, 2019
    Inventors: Tsuguhiro Yoshida, Masaru Shimura, Shinji Katagiri, Eiichi Hamana, Takahiro Ikeda, Takayuki Tanaka, Shuichi Tetsuno
  • Patent number: 10168645
    Abstract: An intermediate transfer belt includes a base layer that has ionic conductivity and is a thickest layer out of multiple layers making up the intermediate transfer belt with respect to the thickness direction of the intermediate transfer belt, and an inner layer having electronic conductivity and a lower electrical resistance than the base layer.
    Type: Grant
    Filed: July 28, 2017
    Date of Patent: January 1, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Tsuguhiro Yoshida, Masaru Shimura, Shinji Katagiri, Eiichi Hamana, Takahiro Ikeda, Takayuki Tanaka, Shuichi Tetsuno
  • Publication number: 20180032001
    Abstract: An intermediate transfer belt includes a base layer that has ionic conductivity and is a thickest layer out of multiple layers making up the intermediate transfer belt with respect to the thickness direction of the intermediate transfer belt, and an inner layer having electronic conductivity and a lower electrical resistance than the base layer.
    Type: Application
    Filed: July 28, 2017
    Publication date: February 1, 2018
    Inventors: Tsuguhiro Yoshida, Masaru Shimura, Shinji Katagiri, Eiichi Hamana, Takahiro Ikeda, Takayuki Tanaka, Shuichi Tetsuno
  • Patent number: 9684255
    Abstract: Provided is a coating agent having a polymerizable compound containing a hydroxyl group in the molecule, conductive inorganic particles whose surface is treated with a dispersing agent having a nitrogen atom in the molecule, and a solvent, in which when the interatomic distance between an oxygen atom of the hydroxyl group and the atom farthest away from the oxygen atom in the molecule of the polymerizable compound is represented by D1 and the interatomic distance between the nitrogen atom and the atom farthest away from the nitrogen atom in the molecule of the dispersing agent is represented by D2, D1 and D2 satisfy the relationship represented by the following formula (1). [(|D1?D2|)/D2]?0.
    Type: Grant
    Filed: May 22, 2015
    Date of Patent: June 20, 2017
    Assignee: Canon Kabushiki Kaisha
    Inventors: Noriaki Egawa, Eiichi Hamana
  • Publication number: 20170168405
    Abstract: An electrophotographic member capable of maintaining stable quality regardless of environment in forming a surface layer is provided. The electrophotographic member includes a base layer and a surface layer. The surface layer includes a heteroaggregate of inorganic oxide particles, electro-conductive metal oxide particles different from the inorganic oxide particles, and an ionic liquid.
    Type: Application
    Filed: December 8, 2016
    Publication date: June 15, 2017
    Inventors: Kouichi Uchida, Eiichi Hamana, Noriaki Egawa
  • Patent number: 9442430
    Abstract: Provided is a transfer member for electrophotography, comprising a substrate and a surface layer on the substrate, wherein the surface layer comprises: an acrylic resin having a hydroxyl group; and a fluorine compound, the fluorine compound having an alkyl group including 1 to 8 carbon atoms, and a fluorine atom substituting at least one hydrogen atom in the alkyl group, and comprising a constitutional unit represented by the following formula (1).
    Type: Grant
    Filed: May 18, 2015
    Date of Patent: September 13, 2016
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Eiichi Hamana, Yasutomo Tsuji
  • Patent number: 9423727
    Abstract: The intermediate transfer member is an intermediate transfer member for electrophotography, including a surface layer having a surface for carrying toner, in which: the surface layer contains a fluorine-modified curable resin having one of an acryloyl group and a methacryloyl group, and electro-conductive inorganic particles; and the surface layer has a ratio of the number of atoms of an element derived from the electro-conductive inorganic particles to the total number of atoms to be detected through analysis of the surface by X-ray photoelectron spectroscopy of 2.5 atomic % or more and 10 atomic % or less, and a peak detected at a position corresponding to a mass-to-charge ratio [m/z] of one of m/z=71 and m/z=85 in analysis of the surface by time-of-flight secondary ion mass spectrometry.
    Type: Grant
    Filed: November 8, 2013
    Date of Patent: August 23, 2016
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Toshiyuki Yoshida, Eiichi Hamana, Yasutomo Tsuji
  • Publication number: 20150346618
    Abstract: Provided is a coating agent having a polymerizable compound containing a hydroxyl group in the molecule, conductive inorganic particles whose surface is treated with a dispersing agent having a nitrogen atom in the molecule, and a solvent, in which when the interatomic distance between an oxygen atom of the hydroxyl group and the atom farthest away from the oxygen atom in the molecule of the polymerizable compound is represented by D1 and the interatomic distance between the nitrogen atom and the atom farthest away from the nitrogen atom in the molecule of the dispersing agent is represented by D2, D1 and D2 satisfy the relationship represented by the following formula (1). [(|D1?D2|)/D2]?0.
    Type: Application
    Filed: May 22, 2015
    Publication date: December 3, 2015
    Inventors: Noriaki Egawa, Eiichi Hamana
  • Publication number: 20150344721
    Abstract: Provided is a transfer member for electrophotography, comprising a substrate and a surface layer on the substrate, wherein the surface layer comprises: an acrylic resin having a hydroxyl group; and a fluorine compound, the fluorine compound having an alkyl group including 1 to 8 carbon atoms, and a fluorine atom substituting at least one hydrogen atom in the alkyl group, and comprising a constitutional unit represented by the following formula (1).
    Type: Application
    Filed: May 18, 2015
    Publication date: December 3, 2015
    Inventors: Eiichi Hamana, Yasutomo Tsuji
  • Publication number: 20140162068
    Abstract: The intermediate transfer member is an intermediate transfer member for electrophotography, including a surface layer having a surface for carrying toner, in which: the surface layer contains a fluorine-modified curable resin having one of an acryloyl group and a methacryloyl group, and electro-conductive inorganic particles; and the surface layer has a ratio of the number of atoms of an element derived from the electro-conductive inorganic particles to the total number of atoms to be detected through analysis of the surface by X-ray photoelectron spectroscopy of 2.5 atomic % or more and 10 atomic % or less, and a peak detected at a position corresponding to a mass-to-charge ratio [m/z] of one of m/z=71 and m/z=85 in analysis of the surface by time-of-flight secondary ion mass spectrometry.
    Type: Application
    Filed: November 8, 2013
    Publication date: June 12, 2014
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Toshiyuki Yoshida, Eiichi Hamana, Yasutomo Tsuji