Patents by Inventor Yuka Ishizuka

Yuka Ishizuka 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: 20070003851
    Abstract: An electrophotographic apparatus is disclosed using an electrophotographic photosensitive member which employs light with a short wavelength (380 nm to 500 nm) as image exposure light and is good in photoelectric conversion efficiency on the whole at that wavelength. The electrophotographic photosensitive member is composed of a reflecting layer, a charge generation layer and a charge transport layer formed on a support. The total reflectance and specular reflectance of the reflecting layer are 30% or more (with respect to a standard white board) and less than 15%, respectively, at that short-wavelength light. The absorbance of the charge generation layer is 1.0 or less at that short-wavelength light.
    Type: Application
    Filed: July 7, 2006
    Publication date: January 4, 2007
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Masataka Kawahara, Masato Tanaka, Atsushi Fujii, Yuka Ishizuka, Masaki Nonaka
  • Patent number: 7097950
    Abstract: An electrophotographic photosensitive member capable of outputting an image in which a defect such as a ghost is suppressed even in a high-temperature-and-high-humidity environment, and in which a defect such as a change in density due to an abrupt change in light-area potential at an initial stage or a ghost due to long-term durable use is suppressed even in a low-humidity environment; and a process cartridge and an electrophotographic apparatus each having the electrophotographic photosensitive member; are provided. The electrophotographic photosensitive member has a layer which comprises a compound having a specific structure between a support and a charge-generating layer.
    Type: Grant
    Filed: June 14, 2005
    Date of Patent: August 29, 2006
    Assignee: Canon Kabushiki Kaisha
    Inventors: Masato Tanaka, Masataka Kawahara, Atsushi Fujii, Yuka Ishizuka
  • Publication number: 20060172208
    Abstract: An electrophotographic photosensitive member capable of outputting an image in which a defect such as a ghost is suppressed even in a high-temperature-and-high-humidity environment, and in which a defect such as a change in density due to an abrupt change in light-area potential at an initial stage or a ghost due to long-term durable use is suppressed even in a low-humidity environment; and a process cartridge and an electrophotographic apparatus each having the electrophotographic photosensitive member; are provided. The electrophotographic photosensitive member has a layer which comprises a compound having a specific structure between a support and a charge-generating layer.
    Type: Application
    Filed: February 22, 2006
    Publication date: August 3, 2006
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Masato Tanaka, Masataka Kawahara, Atsushi Fujii, Yuka Ishizuka
  • Publication number: 20050282076
    Abstract: An electrophotographic photosensitive member capable of outputting an image in which a defect such as a ghost is suppressed even in a high-temperature-and-high-humidity environment, and in which a defect such as a change in density due to an abrupt change in light-area potential at an initial stage or a ghost due to long-term durable use is suppressed even in a low-humidity environment; and a process cartridge and an electrophotographic apparatus each having the electrophotographic photosensitive member; are provided. The electrophotographic photosensitive member has a layer which comprises a compound having a specific structure between a support and a charge-generating layer.
    Type: Application
    Filed: June 14, 2005
    Publication date: December 22, 2005
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Masato Tanaka, Masataka Kawahara, Atsushi Fujii, Yuka Ishizuka