Patents by Inventor Harunobu Ogaki

Harunobu Ogaki 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).

  • Publication number: 20210026268
    Abstract: Provided is a process cartridge detachably attachable to a main body of an electrophotographic apparatus, the process cartridge including: a developing unit including a toner; and an electrophotographic photosensitive member, wherein the toner includes a toner particle, the toner particle has a surface containing a polyvalent acid metal salt particle, and a surface layer of the electrophotographic photosensitive member contains at least one metal oxide particle among an aluminum oxide particle, a silicon dioxide particle, and a tin oxide particle.
    Type: Application
    Filed: July 21, 2020
    Publication date: January 28, 2021
    Inventors: Takeshi Murakami, Kazunori Noguchi, Harunobu Ogaki, Kenta Kamikura, Yuzo Seino, Takashi Kenmoku
  • Publication number: 20210026261
    Abstract: Provided are a process cartridge and an electrophotographic apparatus each of which is reduced in fogging for reducing a toner consumption. Specifically, provided is a process cartridge, which is removably mounted onto a main body of an electrophotographic apparatus, the process cartridge including: a developing unit containing a toner; and an electrophotographic photosensitive member, wherein the toner is a toner including a toner particle, and has a polyvalent acid metal salt on at least part of a surface of the toner particle, wherein the polyvalent acid metal salt includes at least one kind of metal element selected from metal elements belonging to from Group 3 to Group 13, and wherein a surface layer of the electrophotographic photosensitive member contains a resin including a siloxane segment.
    Type: Application
    Filed: July 21, 2020
    Publication date: January 28, 2021
    Inventors: Harunobu Ogaki, Kazunori Noguchi, Takeshi Murakami, Takashi Kenmoku, Yuzo Seino, Kenta Kamikura
  • Publication number: 20210026260
    Abstract: The present disclosure provides a process cartridge and an electrophotographic apparatus in which fogging is reduced so as to reduce an amount of toner consumed. A process cartridge configured to be detachably attachable to a main body of an electrophotographic apparatus includes a developing unit containing a toner, and an electrophotographic photosensitive member, wherein the toner is a toner that has a toner particle, and has a metal salt of a polyvalent acid at least on a part of a surface of the toner particle; wherein the metal salt of the polyvalent acid includes at least one kind of metal element selected from metal elements belonging to from Group 3 to Group 13, and a surface layer of the electrophotographic photosensitive member contains an acrylic resin or a methacrylic resin.
    Type: Application
    Filed: July 21, 2020
    Publication date: January 28, 2021
    Inventors: Kazunori Noguchi, Takeshi Murakami, Harunobu Ogaki, Kenta Kamikura, Yuzo Seino, Takashi Kenmoku
  • Patent number: 10663913
    Abstract: Provided is a process cartridge having a charging member and an electrophotographic photosensitive member to be charged by being in contact with the charging member, wherein the electrophotographic photosensitive member has a support and a photosensitive layer in this order, and a surface layer of the electrophotographic photosensitive member has a Martens hardness of 230 N/mm2 or less.
    Type: Grant
    Filed: November 21, 2018
    Date of Patent: May 26, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Tatsuya Yamaai, Kazunori Noguchi, Shuhei Iwasaki, Akira Sakakibara, Daisuke Miura, Harunobu Ogaki, Takumi Furukawa, Yuya Tomomizu
  • Patent number: 10545453
    Abstract: Provided are a process cartridge and an electrophotographic apparatus each suppressed in fluctuation in charging potential at the time of its long-term use. The process cartridge includes: an electrophotographic photosensitive member having a surface layer containing a resin and a charge-transporting substance; and a charging member configured to charge the electrophotographic photosensitive member, wherein an average of Martens hardnesses of the surface layer of the electrophotographic photosensitive member measured at a pushing force of 7 mN is 245 N/mm2 or more, and wherein in a core defined by three-dimensional surface texture standards (ISO 25178-2:2012) of the surface of the charging member, an average of Martens hardnesses measured at a pushing force of 0.04 mN is 2 N/mm2 or more and 20 N/mm2 or less, and an average of adhesivenesses measured with a scanning probe microscope in a field of view of 2-micrometer square is 70 mV or less.
    Type: Grant
    Filed: November 20, 2018
    Date of Patent: January 28, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Shuhei Iwasaki, Kazunori Noguchi, Harunobu Ogaki, Tatsuya Yamaai, Daisuke Miura, Akira Sakakibara, Takumi Furukawa, Yuya Tomomizu
  • Patent number: 10452021
    Abstract: A process cartridge configured to be detachably attachable to a main body of an electrophotographic image forming apparatus, in which an occurrence of an image failure is suppressed, wherein the process cartridge includes an electrophotographic photosensitive member and a cleaning member arranged in contact with the electrophotographic photosensitive member, wherein an elastic deformation modulus of a surface layer of the electrophotographic photosensitive member is 35% or larger, and the cleaning member is formed of a urethane foam, wherein a density of the urethane foam is 200 to 500 kg/cm3, and a 25% compressive load of the urethane foam is 0.3 MPa or smaller.
    Type: Grant
    Filed: November 21, 2018
    Date of Patent: October 22, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Daisuke Miura, Shuhei Iwasaki, Akira Sakakibara, Tatsuya Yamaai, Kazunori Noguchi, Harunobu Ogaki, Kazunari Hagiwara, Yuji Kawaguchi
  • Patent number: 10331052
    Abstract: An electrophotographic photosensitive member includes a surface layer containing a charge transporting material and a polyester resin having a specific structure.
    Type: Grant
    Filed: December 14, 2017
    Date of Patent: June 25, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kazunori Noguchi, Takeshi Murakami, Nobuhiro Nakamura, Atsushi Okuda, Harunobu Ogaki
  • Publication number: 20190163119
    Abstract: Provided is a process cartridge having a charging member and an electrophotographic photosensitive member to be charged by being in contact with the charging member, wherein the electrophotographic photosensitive member has a support and a photosensitive layer in this order, and a surface layer of the electrophotographic photosensitive member has a Martens hardness of 230 N/mm2 or less.
    Type: Application
    Filed: November 21, 2018
    Publication date: May 30, 2019
    Inventors: Tatsuya Yamaai, Kazunori Noguchi, Shuhei Iwasaki, Akira Sakakibara, Daisuke Miura, Harunobu Ogaki, Takumi Furukawa, Yuya Tomomizu
  • Publication number: 20190163118
    Abstract: Provided are a process cartridge and an electrophotographic apparatus each suppressed in fluctuation in charging potential at the time of its long-term use. The process cartridge includes: an electrophotographic photosensitive member having a surface layer containing a resin and a charge-transporting substance; and a charging member configured to charge the electrophotographic photosensitive member, wherein an average of Martens hardnesses of the surface layer of the electrophotographic photosensitive member measured at a pushing force of 7 mN is 245 N/mm2 or more, and wherein in a core defined by three-dimensional surface texture standards (ISO 25178-2:2012) of the surface of the charging member, an average of Martens hardnesses measured at a pushing force of 0.04 mN is 2 N/mm2 or more and 20 N/mm2 or less, and an average of adhesivenesses measured with a scanning probe microscope in a field of view of 2-micrometer square is 70 mV or less.
    Type: Application
    Filed: November 20, 2018
    Publication date: May 30, 2019
    Inventors: Shuhei Iwasaki, Kazunori Noguchi, Harunobu Ogaki, Tatsuya Yamaai, Daisuke Miura, Akira Sakakibara, Takumi Furukawa, Yuya Tomomizu
  • Publication number: 20190163120
    Abstract: A process cartridge configured to be detachably attachable to a main body of an electrophotographic image forming apparatus, in which an occurrence of an image failure is suppressed, wherein the process cartridge includes an electrophotographic photosensitive member and a cleaning member arranged in contact with the electrophotographic photosensitive member, wherein an elastic deformation modulus of a surface layer of the electrophotographic photosensitive member is 35% or larger, and the cleaning member is formed of a urethane foam, wherein a density of the urethane foam is 200 to 500 kg/cm3, and a 25% compressive load of the urethane foam is 0.3 MPa or smaller.
    Type: Application
    Filed: November 21, 2018
    Publication date: May 30, 2019
    Inventors: Daisuke Miura, Shuhei Iwasaki, Akira Sakakibara, Tatsuya Yamaai, Kazunori Noguchi, Harunobu Ogaki, Kazunari Hagiwara, Yuji Kawaguchi
  • Patent number: 10067432
    Abstract: An electrophotographic photosensitive member includes a surface layer containing a charge transporting material and a specific polyester resin having a structure including a specific branched chain.
    Type: Grant
    Filed: May 23, 2017
    Date of Patent: September 4, 2018
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kazunori Noguchi, Harunobu Ogaki, Kazumichi Sugiyama
  • Patent number: 10031430
    Abstract: An electrophotographic photosensitive member including a surface layer containing a specific polyester resin is provided. The polyester resin contains specific structures.
    Type: Grant
    Filed: February 14, 2017
    Date of Patent: July 24, 2018
    Assignee: Canon Kabushiki Kaisha
    Inventors: Harunobu Ogaki, Kazunori Noguchi, Kazumichi Sugiyama
  • Publication number: 20180173121
    Abstract: An electrophotographic photosensitive member includes a surface layer containing a charge transporting material and a polyester resin having a specific structure.
    Type: Application
    Filed: December 14, 2017
    Publication date: June 21, 2018
    Inventors: Kazunori Noguchi, Takeshi Murakami, Nobuhiro Nakamura, Atsushi Okuda, Harunobu Ogaki
  • Patent number: 9971257
    Abstract: An electrophotographic photosensitive member including a surface layer containing a charge generating material and a polyester resin is provided. The polyester resin contains a structure having a 12- or higher-membered cycloalkylene group.
    Type: Grant
    Filed: February 14, 2017
    Date of Patent: May 15, 2018
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kazumichi Sugiyama, Kazunori Noguchi, Harunobu Ogaki
  • Patent number: 9857704
    Abstract: A process cartridge includes an electrophotographic photosensitive member and a gap retaining member, where the electrophotographic photosensitive member includes a first region having an undercoat layer, a charge generating layer, and a charge transporting layer on a support in this order and a second region having an undercoat layer and a charge transporting layer on a support in this order, the undercoat layer contains a metal oxide particle and any one of an urethane resin, an amino resin, and a polyamide resin as a binder resin, and the charge transporting layer contains a charge transporting substance and at least one selected from the group consisting of a polycarbonate resin and a polyester resin, and where the gap retaining member comes into contact with a surface of the second region of the electrophotographic photosensitive member.
    Type: Grant
    Filed: August 21, 2015
    Date of Patent: January 2, 2018
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yota Ito, Hiroyuki Tomono, Takashi Anezaki, Daisuke Miura, Harunobu Ogaki
  • Patent number: 9851646
    Abstract: Provided is an electrophotographic apparatus, including an electrophotographic photosensitive member, a charging unit arranged in a non-abutment manner with respect to the electrophotographic photosensitive member, a cleaning unit or a developing unit arranged in abutment against the electrophotographic photosensitive member, and a transferring unit.
    Type: Grant
    Filed: February 8, 2017
    Date of Patent: December 26, 2017
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Hiroyuki Tomono, Daisuke Miura, Takashi Anezaki, Yota Ito, Harunobu Ogaki
  • Publication number: 20170343909
    Abstract: An electrophotographic photosensitive member includes a surface layer containing a charge transporting material and a specific polyester resin having a structure including a specific branched chain.
    Type: Application
    Filed: May 23, 2017
    Publication date: November 30, 2017
    Inventors: Kazunori Noguchi, Harunobu Ogaki, Kazumichi Sugiyama
  • Patent number: 9791792
    Abstract: An electrophotographic photosensitive member includes a surface layer with a hexagonal boron nitride dispersed therein. The hexagonal boron nitride has a graphitization index (GI) of at least 3.0 and less than 15.0.
    Type: Grant
    Filed: April 18, 2016
    Date of Patent: October 17, 2017
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Yohei Miyauchi, Kimihiro Yoshimura, Harunobu Ogaki, Atsushi Okuda, Yuki Yamamoto, Wataru Kitamura, Mai Murakami
  • Publication number: 20170242352
    Abstract: An electrophotographic photosensitive member including a surface layer containing a specific polyester resin is provided. The polyester resin contains specific structures.
    Type: Application
    Filed: February 14, 2017
    Publication date: August 24, 2017
    Inventors: Harunobu Ogaki, Kazunori Noguchi, Kazumichi Sugiyama
  • Publication number: 20170242350
    Abstract: An electrophotographic photosensitive member including a surface layer containing a charge generating material and a polyester resin is provided. The polyester resin contains a structure having a 12- or higher-membered cycloalkylene group.
    Type: Application
    Filed: February 14, 2017
    Publication date: August 24, 2017
    Inventors: Kazumichi Sugiyama, Kazunori Noguchi, Harunobu Ogaki