Patents by Inventor Yoichi KIGOSHI

Yoichi KIGOSHI 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: 20200012205
    Abstract: An electrophotographic photoreceptor includes a conductive substrate; an undercoat layer on the conductive substrate; a charge generating layer on the undercoat layer; a charge transporting layer on the charge generating layer; and an inorganic protective layer on the charge transporting layer. The undercoat layer, the charge transporting layer, and the inorganic protective layer each have a film elastic modulus of 5 GPa or more.
    Type: Application
    Filed: January 29, 2019
    Publication date: January 9, 2020
    Applicant: FUJI XEROX CO.,LTD.
    Inventors: Yoichi KIGOSHI, Takeshi IWANAGA, Nobuyuki TORIGOE, Masaki HIRAKATA, Hideya KATSUHARA, Keisuke KUSANO
  • Publication number: 20190346781
    Abstract: An electrophotographic photoreceptor of an exemplary embodiment includes a conductive substrate, an undercoat layer on the conductive substrate, a charge generating layer on the undercoat layer, a charge transporting layer on the charge generating layer, and an inorganic protective layer on the charge transporting layer, in which formula: 0<A/B<0.5 is satisfied, where A represents a thickness of a layer having the lowest film elastic modulus among the layers disposed on the conductive substrate other than the charge generating layer, and B represents a total thickness of the layers disposed on the conductive substrate.
    Type: Application
    Filed: February 6, 2019
    Publication date: November 14, 2019
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Hideya KATSUHARA, Takeshi IWANAGA, Masaki HIRAKATA, Nobuyuki TORIGOE, Yoichi KIGOSHI
  • 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: 10073364
    Abstract: Electrophotographic photoreceptor including a conductive substrate, an organic photosensitive layer on an outer peripheral surface of the conductive substrate, and an inorganic protective layer on an outer peripheral surface of the organic photosensitive layer, the inorganic protective layer containing gallium and oxygen. A volume resistivity of an inner region of the inorganic protective layer, the inner region extending 0.2 ?m or about 0.2 ?m from an inner peripheral surface of the inorganic protective layer in a thickness direction, and a volume resistivity of an outer region of the inorganic protective layer, the outer region extending 0.2 ?m or about 0.2 ?m from an outer peripheral surface of the inorganic protective layer in the thickness direction, are both 6.0×107 ?·cm or more and 4.0×108 ?·cm or less or about 6.0×107 ?·cm or more and about 4.0×108 ?·cm or less.
    Type: Grant
    Filed: July 12, 2017
    Date of Patent: September 11, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Yoichi Kigoshi, Masaki Hirakata, Satomi Kashiwagi, Nobuyuki Torigoe, Takeshi Iwanaga, Takashi Imai
  • Patent number: 10001714
    Abstract: An electrophotographic photosensitive member includes a conductive base; an organic photosensitive layer disposed on the conductive base, the organic photosensitive layer including a layer that constitutes a surface and contains a charge transport material, a binder resin having a viscosity-average molecular weight less than about 50,000, and silica particles in an amount of about 40% by weight or more; and an inorganic protective layer disposed on the organic photosensitive layer.
    Type: Grant
    Filed: January 15, 2016
    Date of Patent: June 19, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Masaki Hirakata, Takeshi Iwanaga, Nobuyuki Torigoe, Hideya Katsuhara, Yoichi Kigoshi, Takashi Imai, Fumiaki Mera
  • Publication number: 20180095372
    Abstract: Electrophotographic photoreceptor including a conductive substrate, an organic photosensitive layer on an outer peripheral surface of the conductive substrate, and an inorganic protective layer on an outer peripheral surface of the organic photosensitive layer, the inorganic protective layer containing gallium and oxygen. A volume resistivity of an inner region of the inorganic protective layer, the inner region extending 0.2 ?m or about 0.2 ?m from an inner peripheral surface of the inorganic protective layer in a thickness direction, and a volume resistivity of an outer region of the inorganic protective layer, the outer region extending 0.2 ?m or about 0.2 ?m from an outer peripheral surface of the inorganic protective layer in the thickness direction, are both 6.0×107 ?·cm or more and 4.0×108 ?·cm or less or about 6.0×107 ?·cm or more and about 4.0×108 ?·cm or less.
    Type: Application
    Filed: July 12, 2017
    Publication date: April 5, 2018
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Yoichi KIGOSHI, Masaki HIRAKATA, Satomi KASHIWAGI, Nobuyuki TORIGOE, Takeshi IWANAGA, Takashi IMAI
  • Patent number: 9904204
    Abstract: A unit for an image forming apparatus includes an electrophotographic photoreceptor that includes a conductive substrate, a photosensitive layer provided on the conductive substrate, and a surface layer provided so as to contact with an outermost surface of the photosensitive layer, and an exposure section that exposes the electrophotographic photoreceptor with a light having a wavelength (?) (nm) so as to form an electrostatic latent image on a charged surface of the electrophotographic photoreceptor, wherein a surface roughness (Rz1) (nm) of the outermost surface of the photosensitive layer satisfies an expression of [(Rz1)?(?)/(4×(n2))] where a refractive index of the surface layer is set as (n2), and an outermost surface of the surface layer has a surface shape different from the outermost surface of the photosensitive layer.
    Type: Grant
    Filed: February 4, 2016
    Date of Patent: February 27, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Takeshi Iwanaga, Takashi Imai, Hideya Katsuhara, Masaki Hirakata, Yoichi Kigoshi, Nobuyuki Torigoe, Fumiaki Mera
  • Patent number: 9864286
    Abstract: An electrophotographic photoreceptor includes an electroconductive substrate, an organic photosensitive layer on the electroconductive substrate and an inorganic protective layer on the organic photosensitive layer, wherein a layer that forms a surface of the organic photosensitive layer contains a charge transporting material, a binder resin, and a silica particle; the inorganic protective layer contains a group 13 element, an oxygen atom, and a hydrogen atom; a sum of element constitution ratios of the group 13 element, the oxygen atom, and the hydrogen atom to all elements constituting the inorganic protective layer is equal to or more than 90 atomic %; and an element composition ratio (oxygen atom/group 13 element) of the oxygen atom and the group 13 element is 1.0 or more and less than 1.5.
    Type: Grant
    Filed: July 8, 2016
    Date of Patent: January 9, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Fumiaki Mera, Nobuyuki Torigoe, Masaki Hirakata, Hideya Katsuhara, Yoichi Kigoshi, Satomi Kashiwagi, Yuko Iwadate, Kenji Kajiwara, Tatsuki Sano, Takashi Imai, Takeshi Iwanaga
  • Publication number: 20170269486
    Abstract: An electrophotographic photoreceptor includes an electroconductive substrate, an organic photosensitive layer on the electroconductive substrate and an inorganic protective layer on the organic photosensitive layer, wherein a layer that forms a surface of the organic photosensitive layer contains a charge transporting material, a binder resin, and a silica particle; the inorganic protective layer contains a group 13 element, an oxygen atom, and a hydrogen atom; a sum of element constitution ratios of the group 13 element, the oxygen atom, and the hydrogen atom to all elements constituting the inorganic protective layer is equal to or more than 90 atomic %; and an element composition ratio (oxygen atom/group 13 element) of the oxygen atom and the group 13 element is 1.0 or more and less than 1.5.
    Type: Application
    Filed: July 8, 2016
    Publication date: September 21, 2017
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Fumiaki MERA, Nobuyuki TORIGOE, Masaki HIRAKATA, Hideya KATSUHARA, Yoichi KIGOSHI, Satomi KASHIWAGI, Yuko IWADATE, Kenji KAJIWARA, Tatsuki SANO, Takashi IMAI, Takeshi IWANAGA
  • Publication number: 20170090312
    Abstract: An electrophotographic photosensitive member includes a conductive base; an organic photosensitive layer disposed on the conductive base, the organic photosensitive layer including a layer that constitutes a surface and contains a charge transport material, a binder resin, and silica particles in an amount of about 40% by weight or more; and an inorganic protective layer disposed on the organic photosensitive layer and having a surface roughness Ra of about 5 nm or less.
    Type: Application
    Filed: January 21, 2016
    Publication date: March 30, 2017
    Applicant: FUJI XEROX Co., Ltd.
    Inventors: Masaki HIRAKATA, Hideya KATSUHARA, Yoichi KIGOSHI, Takeshi IWANAGA, Nobuyuki TORIGOE, Takashi IMAI, Tatsuki SANO
  • Publication number: 20170090339
    Abstract: A unit for an image forming apparatus includes an electrophotographic photoreceptor that includes a conductive substrate, a photosensitive layer provided on the conductive substrate, and a surface layer provided so as to contact with an outermost surface of the photosensitive layer, and an exposure section that exposes the electrophotographic photoreceptor with a light having a wavelength (?) (nm) so as to form an electrostatic latent image on a charged surface of the electrophotographic photoreceptor, wherein a surface roughness (Rz1) (nm) of the outermost surface of the photosensitive layer satisfies an expression of [(Rz1)?(?)/(4×(n2))] where a refractive index of the surface layer is set as (n2), and an outermost surface of the surface layer has a surface shape different from the outermost surface of the photosensitive layer.
    Type: Application
    Filed: February 4, 2016
    Publication date: March 30, 2017
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Takeshi IWANAGA, Takashi IMAI, Hideya KATSUHARA, Masaki HIRAKATA, Yoichi KIGOSHI, Nobuyuki TORIGOE, Fumiaki MERA
  • Publication number: 20170090307
    Abstract: An electrophotographic photosensitive member includes a conductive base; an organic photosensitive layer disposed on the conductive base, the organic photosensitive layer including a layer that constitutes a surface and contains a charge transport material, a binder resin having a viscosity-average molecular weight less than about 50,000, and silica particles in an amount of about 40% by weight or more; and an inorganic protective layer disposed on the organic photosensitive layer.
    Type: Application
    Filed: January 15, 2016
    Publication date: March 30, 2017
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Masaki HIRAKATA, Takeshi IWANAGA, Nobuyuki TORIGOE, Hideya KATSUHARA, Yoichi KIGOSHI, Takashi IMAI, Fumiaki MERA