Patents by Inventor Hirotaka Araki

Hirotaka Araki 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).

  • Process cartridge and electrophotographic apparatus
    Patent number: 11340553
    Abstract: The process cartridge includes an electrophotographic photosensitive member having a first support and a photosensitive layer; and a charging member. In the photosensitive member when an electric current is measured which flows when a voltage is applied to a surface while being varied, a gradient a1 of a low electric field region and a gradient a2 of a high electric field region satisfy a2/a1?1.50, in a graph. The charging member includes a second support having an electroconductive outer surface, and a second electroconductive layer including a matrix and a plurality of domains being dispersed in the matrix, at least a portion of the domain is exposed to an outer surface which includes at least the matrix and at least a portion of the domain, and a volume resistivity ?M of the matrix is 1.00×105 times or higher of a volume resistivity ?D of the domain.
    Type: Grant
    Filed: October 14, 2020
    Date of Patent: May 24, 2022
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Kaname Watariguchi, Kohei Makisumi, Fumiyuki Hiyama, Yuichi Kikuchi, Kazuhiro Yamauchi, Hirotaka Araki, Seiichi Miyazawa
  • PROCESS CARTRIDGE AND ELECTROPHOTOGRAPHIC APPARATUS
    Publication number: 20210116858
    Abstract: The process cartridge includes an electrophotographic photosensitive member having a first support and a photosensitive layer; and a charging member. In the photosensitive member when an electric current is measured which flows when a voltage is applied to a surface while being varied, a gradient a1 of a low electric field region and a gradient a2 of a high electric field region satisfy a2/a1?1.50, in a graph. The charging member includes a second support having an electroconductive outer surface, and a second electroconductive layer including a matrix and a plurality of domains being dispersed in the matrix, at least a portion of the domain is exposed to an outer surface which includes at least the matrix and at least a portion of the domain, and a volume resistivity ?M of the matrix is 1.00×105 times or higher of a volume resistivity ?D of the domain.
    Type: Application
    Filed: October 14, 2020
    Publication date: April 22, 2021
    Inventors: Kaname Watariguchi, Kohei Makisumi, Fumiyuki Hiyama, Yuichi Kikuchi, Kazuhiro Yamauchi, Hirotaka Araki, Seiichi Miyazawa