Patents by Inventor Hiroshi Yosinaga

Hiroshi Yosinaga 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).

  • Apparatus for minimizing toner contamination on an image formation member
    Patent number: 6470161
    Abstract: To prevent deterioration of charge performance, which is caused by wear of a gap control member that keeps a charge roller into non-contact with the image carrier, the charge roller is brought into contact with a surface of a photosensitive drum via a pair of tape members as the gap control member that contacts with a coat and non-charge portion of the photosensitive drum. A gap G can be formed between an effective charge width portion of the charge roller and the surface of the photosensitive drum.
    Type: Grant
    Filed: April 6, 2001
    Date of Patent: October 22, 2002
    Assignee: Ricoh Company, Ltd.
    Inventors: Takatsugu Fujishiro, Masami Hiramatsu, Masumi Sato, Hitoshi Ishibashi, Hiroshi Yosinaga, Yukiko Iwasaki
  • Apparatus for minimizing toner contamination on an image formation member
    Publication number: 20010053298
    Abstract: To prevent deterioration of charge performance, which is caused by wear of a gap control member that keeps a charge roller into non-contact with the image carrier, the charge roller is brought into contact with a surface of a photosensitive drum via a pair of tape members as the gap control member that contacts with a coat and non-charge portion of the photosensitive drum. A gap G can be formed between an effective charge width portion of the charge roller and the surface of the photosensitive drum.
    Type: Application
    Filed: April 6, 2001
    Publication date: December 20, 2001
    Applicant: RICOH COMPANY, LTD.
    Inventors: Takatsugu Fujishiro, Masami Hiramatsu, Masumi Sato, Hitoshi Ishibashi, Hiroshi Yosinaga, Yukiko Iwasaki