Patents by Inventor Tatsuya Yamaai

Tatsuya Yamaai 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: 10983449
    Abstract: A method for manufacturing an electrophotographic photoconductor including a charge generating layer and a charge transport layer in this order on a cylindrical electrically-conductive support including the steps of: (i) immersing the support in a charge generating layer coating liquid, (ii) pulling the support out of the coating liquid, (iii) heat drying the support coated with the coating liquid to form the charge generating layer, (iv) cooling the charge generating layer, and (v) immersing the support on which the charge generating layer has been formed in a charge transport layer coating liquid while retaining gas inside of the support. The charge transport layer coating liquid contains a solvent having a boiling point of 34° C. or more and 85° C. or less, and the step (v) satisfies two specific conditions.
    Type: Grant
    Filed: March 24, 2020
    Date of Patent: April 20, 2021
    Assignee: Canon Kabushiki Kaisha
    Inventors: Akihiro Maruyama, Kazuko Araki, Daisuke Miura, Tatsuya Yamaai, Hiroto Hirayama, Shinobu Iijima, Daisuke Kawaguchi, Takahiro Nagase, Takahisa Taniguchi, Shintarou Goto, Taneyuki Kinoshita
  • Publication number: 20200310262
    Abstract: A method for manufacturing an electrophotographic photoconductor including a charge generating layer and a charge transport layer in this order on a cylindrical electrically-conductive support including the steps of: (i) immersing the support in a charge generating layer coating liquid, (ii) pulling the support out of the coating liquid, (iii) heat drying the support coated with the coating liquid to form the charge generating layer, (iv) cooling the charge generating layer, and (v) immersing the support on which the charge generating layer has been formed in a charge transport layer coating liquid while retaining gas inside of the support. The charge transport layer coating liquid contains a solvent having a boiling point of 34° C. or more and 85° C. or less, and the step (v) satisfies two specific conditions.
    Type: Application
    Filed: March 24, 2020
    Publication date: October 1, 2020
    Inventors: Akihiro Maruyama, Kazuko Araki, Daisuke Miura, Tatsuya Yamaai, Hiroto Hirayama, Shinobu Iijima, Daisuke Kawaguchi, Takahiro Nagase, Takahisa Taniguchi, Shintarou Goto, Taneyuki Kinoshita
  • 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: 10416581
    Abstract: An electrophotographic photosensitive member with suppressed potential variation even in the case that a protective layer including a cured material of a composition having a polymerizable functional group is used is provided. An electrophotographic photosensitive member including a support, a charge generation layer, a charge transport layer containing a charge transporting material, and a protective layer, in the order presented, wherein the charge transport layer contains a polycarbonate resin having a structure selected from a group A and a structure selected from a group B, and the protective layer includes a cured material of a composition containing a compound having at least a functional group selected from chain-polymerizable functional groups and sequential polymerizable functional groups.
    Type: Grant
    Filed: August 3, 2017
    Date of Patent: September 17, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Yota Ito, Tsutomu Nishida, Shoma Hinata, Tatsuya Yamaai, Akira Sakakibara, Daisuke Miura
  • 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: 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
  • 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: 20190121251
    Abstract: An electrophotographic photosensitive member includes a support, a charge generating layer containing a charge generation material, and a charge transporting layer containing a charge transport material in this order, the charge transporting layer serving as a surface layer. The charge transporting layer contains a polycarbonate resin having a particular structural unit.
    Type: Application
    Filed: December 21, 2018
    Publication date: April 25, 2019
    Inventors: Tsutomu Nishida, Akira Sakakibara, Daisuke Miura, Yota Ito, Shoma Hinata, Tatsuya Yamaai, Nobuo Kosaka
  • Patent number: 10209637
    Abstract: An electrophotographic photosensitive member includes a support, a charge generating layer containing a charge generation material, and a charge transporting layer containing a charge transport material in this order, the charge transporting layer serving as a surface layer. The charge transporting layer contains a polycarbonate resin having a particular structural unit.
    Type: Grant
    Filed: July 28, 2017
    Date of Patent: February 19, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Tsutomu Nishida, Akira Sakakibara, Daisuke Miura, Yota Ito, Shoma Hinata, Tatsuya Yamaai, Nobuo Kosaka
  • Publication number: 20180059558
    Abstract: An electrophotographic photosensitive member with suppressed potential variation even in the case that a protective layer including a cured material of a composition having a polymerizable functional group is used is provided. An electrophotographic photosensitive member including a support, a charge generation layer, a charge transport layer containing a charge transporting material, and a protective layer, in the order presented, wherein the charge transport layer contains a polycarbonate resin having a structure selected from a group A and a structure selected from a group B, and the protective layer includes a cured material of a composition containing a compound having at least a functional group selected from chain-polymerizable functional groups and sequential polymerizable functional groups.
    Type: Application
    Filed: August 3, 2017
    Publication date: March 1, 2018
    Inventors: Yota Ito, Tsutomu Nishida, Shoma Hinata, Tatsuya Yamaai, Akira Sakakibara, Daisuke Miura
  • Publication number: 20180031985
    Abstract: An electrophotographic photosensitive member includes a support, a charge generating layer containing a charge generation material, and a charge transporting layer containing a charge transport material in this order, the charge transporting layer serving as a surface layer. The charge transporting layer contains a polycarbonate resin having a particular structural unit.
    Type: Application
    Filed: July 28, 2017
    Publication date: February 1, 2018
    Inventors: Tsutomu Nishida, Akira Sakakibara, Daisuke Miura, Yota Ito, Shoma Hinata, Tatsuya Yamaai, Nobuo Kosaka
  • Patent number: 9864284
    Abstract: An electrophotographic photosensitive member has a support, a charge generation layer, and a charge transport layer in this order, the charge transport layer containing a charge transport material. The charge transport layer is a surface layer of the electrophotographic photosensitive member and contains a polycarbonate resin having a structural unit selected from group A and a structural unit selected from group B.
    Type: Grant
    Filed: February 25, 2016
    Date of Patent: January 9, 2018
    Assignee: Canon Kabushiki Kaisha
    Inventors: Masataka Kawahara, Hirotoshi Uesugi, Akihiro Maruyama, Hirofumi Kumoi, Masato Tanaka, Hiroyuki Tomono, Shoma Hinata, Yota Ito, Daisuke Miura, Takashi Anezaki, Tatsuya Yamaai, Kazumichi Sugiyama
  • Patent number: 9753385
    Abstract: An electrophotographic photosensitive member has a support, a charge generation layer, and a charge transport layer in this order, the charge transport layer containing a charge transport material. The charge transport layer is a surface layer of the electrophotographic photosensitive member and contains a polycarbonate resin having a structural unit selected from group A and a structural unit selected from group B (groups A and B defined in the disclosure).
    Type: Grant
    Filed: February 25, 2016
    Date of Patent: September 5, 2017
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yota Ito, Daisuke Miura, Shoma Hinata, Hiroyuki Tomono, Takashi Anezaki, Tatsuya Yamaai, Kazumichi Sugiyama, Masataka Kawahara, Hirotoshi Uesugi, Akihiro Maruyama, Hirofumi Kumoi, Masato Tanaka
  • Patent number: 9581920
    Abstract: Provided is coating film-removing method for removing unnecessary coating film on outer peripheral surface of lower side of cylindrical substrate by dip coating, the method comprising: supplying solvent to inside of substrate; causing, through use of outer peripheral surface coating film-removing member configured to remove coating film at portion to be subjected to coating film removal in outer peripheral surface of the substrate, the outer peripheral surface coating film-removing member to abut against region ranging from upper end to lower end of coating film at the portion; and removing, under a state wherein the outer peripheral surface coating film-removing member abuts against the region, the coating film at the portion through rubbing by relatively rotating the substrate and the outer peripheral surface coating film-removing member while supplying the solvent, which is supplied to inside and then flows to lower end of the substrate, to abutting portion.
    Type: Grant
    Filed: January 14, 2016
    Date of Patent: February 28, 2017
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Nobuhiro Nakamura, Kazuko Sakuma, Takahisa Taniguchi, Tatsuya Yamaai, Atsushi Fujii, Akihiro Maruyama, Atsushi Okuda, Yuka Ishiduka, Kazunori Noguchi, Yuki Yamamoto
  • Publication number: 20160252829
    Abstract: An electrophotographic photosensitive member has a support, a charge generation layer, and a charge transport layer in this order, the charge transport layer containing a charge transport material. The charge transport layer is a surface layer of the electrophotographic photosensitive member and contains a polycarbonate resin having a structural unit selected from group A and a structural unit selected from group B (groups A and B defined in the disclosure).
    Type: Application
    Filed: February 25, 2016
    Publication date: September 1, 2016
    Inventors: Masataka Kawahara, Hirotoshi Uesugi, Akihiro Maruyama, Hirofumi Kumoi, Masato Tanaka, Hiroyuki Tomono, Shoma Hinata, Yota Ito, Daisuke Miura, Takashi Anezaki, Tatsuya Yamaai, Kazumichi Sugiyama
  • Publication number: 20160252830
    Abstract: An electrophotographic photosensitive member has a support, a charge generation layer, and a charge transport layer in this order, the charge transport layer containing a charge transport material. The charge transport layer is a surface layer of the electrophotographic photosensitive member and contains a polycarbonate resin having a structural unit selected from group A and a structural unit selected from group B (groups A and B defined in the disclosure).
    Type: Application
    Filed: February 25, 2016
    Publication date: September 1, 2016
    Inventors: Yota Ito, Daisuke Miura, Shoma Hinata, Hiroyuki Tomono, Takashi Anezaki, Tatsuya Yamaai, Kazumichi Sugiyama, Masataka Kawahara, Hirotoshi Uesugi, Akihiro Maruyama, Hirofumi Kumoi, Masato Tanaka
  • Publication number: 20160216619
    Abstract: Provided is coating film-removing method for removing unnecessary coating film on outer peripheral surface of lower side of cylindrical substrate by dip coating, the method comprising: supplying solvent to inside of substrate; causing, through use of outer peripheral surface coating film-removing member configured to remove coating film at portion to be subjected to coating film removal in outer peripheral surface of the substrate, the outer peripheral surface coating film-removing member to abut against region ranging from upper end to lower end of coating film at the portion; and removing, under a state wherein the outer peripheral surface coating film-removing member abuts against the region, the coating film at the portion through rubbing by relatively rotating the substrate and the outer peripheral surface coating film-removing member while supplying the solvent, which is supplied to inside and then flows to lower end of the substrate, to abutting portion.
    Type: Application
    Filed: January 14, 2016
    Publication date: July 28, 2016
    Inventors: Nobuhiro Nakamura, Kazuko Sakuma, Takahisa Taniguchi, Tatsuya Yamaai, Atsushi Fujii, Akihiro Maruyama, Atsushi Okuda, Yuka Ishiduka, Kazunori Noguchi, Yuki Yamamoto