Patents by Inventor Mayumi Oshiro

Mayumi Oshiro 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: 8886092
    Abstract: An electrophotographic apparatus and a process cartridge include an electrophotographic photosensitive member; a developing unit; and a cleaning unit, wherein depressed portions separated from each other and satisfying conditions below are formed in the surface of the electrophotographic photosensitive member at a density of 10 or more per unit area of 1 cm2: a depth of the depressed portions is defined as Rdv[?m], a minor-axis diameter of the depressed portions is defined as Lpc[?m], a major-axis diameter of the depressed portions is defined as Rpc[?m], and an angle formed between a direction of a major-axis of each of the depressed portions and a direction of movement of the surface of the electrophotographic photosensitive member is defined as ?[°]. 5[°]??[°]?85[°] 0.3×P[?m]?Rdv[?m]?0.5×P[?m] 1.1×P[?m]?Lpc[?m]?1.
    Type: Grant
    Filed: December 3, 2009
    Date of Patent: November 11, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yoshihisa Saito, Shoji Amamiya, Hideki Ogawa, Tatsuya Ikezue, Kan Tanabe, Mayumi Oshiro, Kumiko Takizawa, Takahiro Mitsui
  • Publication number: 20110243603
    Abstract: An electrophotographic apparatus and a process cartridge include an electrophotographic photosensitive member; a developing unit; and a cleaning unit, wherein depressed portions separated from each other and satisfying conditions below are formed in the surface of the electrophotographic photosensitive member at a density of 10 or more per unit area of 1 cm2: a depth of the depressed portions is defined as Rdv [?m], a minor-axis diameter of the depressed portions is defined as Lpc [?m], a major-axis diameter of the depressed portions is defined as Rpc [?m], and an angle formed between a direction of a major-axis of each of the depressed portions and a direction of movement of the surface of the electrophotographic photosensitive member is defined as ?[°]. 5[°]??[°]?85[°] 0.3×P [?m]?Rdv [?m]?0.5×P [?m] 1.1×P [?m]?Lpc [?m]?1.
    Type: Application
    Filed: December 3, 2009
    Publication date: October 6, 2011
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Yoshihisa Saito, Shoji Amamiya, Hideki Ogawa, Tatsuya Ikezue, Kan Tanabe, Mayumi Oshiro, Kumiko Takizawa, Takahiro Mitsui
  • Patent number: 7813675
    Abstract: An electrophotographic photosensitive member is provide which inhibits recovered toner from leaking out of the edge portion at the time of long-term use, and has good durability. Each of at least both edge portions of the surface layer of the electrophotographic photosensitive member has a region in which independent depressed portions are formed at a density of ten or more portions per 100 ?m square. An average depth Rdv-A, an average short axis diameter Lpc-A, and an average long axis diameter Rpc-A, of the depressed portions are respectively in specific ranges. When an angle formed between the circumferential direction of the electrophotographic photosensitive member and the long axis of each of the depressed portions is represented by ?, the depressed portions are formed so that the angle ? satisfies the relationship of 90°<?<180° toward the center of the electrophotographic photosensitive member.
    Type: Grant
    Filed: November 26, 2008
    Date of Patent: October 12, 2010
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kan Tanabe, Yoshihisa Saito, Hideki Ogawa, Shoji Amamiya, Tatsuya Ikezue, Takahiro Mitsui, Mayumi Oshiro, Kumiko Takizawa
  • Publication number: 20090074460
    Abstract: An electrophotographic photosensitive member is provide which inhibits recovered toner from leaking out of the edge portion at the time of long-term use, and has good durability. Each of at least both edge portions of the surface layer of the electrophotographic photosensitive member has a region in which independent depressed portions are formed at a density of ten or more portions per 100 ?m square. An average depth Rdv-A, an average short axis diameter Lpc-A, and an average long axis diameter Rpc-A, of the depressed portions are respectively in specific ranges. When an angle formed between the circumferential direction of the electrophotographic photosensitive member and the long axis of each of the depressed portions is represented by ?, the depressed portions are formed so that the angle ? satisfies the relationship of 90°<?<180° toward the center of the electrophotographic photosensitive member.
    Type: Application
    Filed: November 26, 2008
    Publication date: March 19, 2009
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Kan Tanabe, Yoshihisa Saito, Hideki Ogawa, Shoji Amamiya, Tatsuya Ikezue, Takahiro Mitsui, Mayumi Oshiro, Kumiko Takizawa