Patents by Inventor Hironori Ohwaki

Hironori Ohwaki 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).

  • Light-receiving member, image-forming apparatus, and image-forming method
    Publication number: 20010051308
    Abstract: A light-receiving member comprising a conductive substrate, and formed superposingly thereon a photosensitive layer and a surface protective layer in order. The light-receiving member has a surface roughness Ra of from 15 nm to 100 nm. Also disclosed is an image-forming apparatus having such a light-receiving member, and an image-forming method of rendering visible an electrostatic pattern formed on the light-receiving member. The light-receiving member promises stable formation of images over a long period of time.
    Type: Application
    Filed: March 16, 2001
    Publication date: December 13, 2001
    Inventors: Kunimasa Kawamura, Shigenori Ueda, Toshiyuki Ehara, Junichiro Hashizume, Ryuji Okamura, Masaya Kawada, Tetsuya Karaki, Hironori Ohwaki
  • Electrophotographic apparatus
    Patent number: 6330412
    Abstract: The present invention relates to an electrophotographic apparatus in which maximum potential difference &Dgr;VD (volt) in a potential of a dark portion of the electrostatic image in the longitudinal direction, maximum potential difference &Dgr;VL in a potential of a light portion of the electrostatic image in the longitudinal direction, a value a (1/volt) represented by (variation amount in density, in the longitudinal direction, in the image formed by developing the light portion with the developing means)/(the maximum potential difference &Dgr;VD) and a value b (1/volt) represented by (variation amount in density, in the longitudinal direction, in the image formed by developing the light portion with the developing means)/(the maximum potential difference &Dgr;VL) satisfy a relation: 0.3≦a×&Dgr;VD+b×&Dgr;VL≦0.3 in which 100≧|&Dgr;VD|≧20 and 100≧|&Dgr;VL|≧20.
    Type: Grant
    Filed: June 16, 2000
    Date of Patent: December 11, 2001
    Assignee: Canon Kabushiki Kaisha
    Inventors: Koji Yamazaki, Yuji Nakayama, Masaya Kawada, Hironori Ohwaki
  • Electrophotographic apparatus
    Patent number: 6169868
    Abstract: The present invention relates to an electrophotographic apparatus in which maximum potential difference &Dgr;VD (volt) in a potential of a dark portion of the electrostatic image in the longitudinal direction, maximum potential difference &Dgr;VL in a potential of a light portion of the electrostatic image in the longitudinal direction, a value a (1/volt) represented by (variation amount in density, in the longitudinal direction, in the image formed by developing the light portion with the developing means)/(the maximum potential difference &Dgr;VD) and a value b (1/volt) represented by (variation amount in density, in the longitudinal direction, in the image formed by developing the light portion with the developing means)/(the maximum potential difference &Dgr;VL) satisfy a relation: 0.3≦a×&Dgr;VD+b×&Dgr;VL≦0.3 in which 100≧|&Dgr;VD|≧20 and 100≧|&Dgr;VL|≧20.
    Type: Grant
    Filed: September 29, 1999
    Date of Patent: January 2, 2001
    Assignee: Canon Kabushiki Kaisha
    Inventors: Koji Yamazaki, Yuji Nakayama, Masaya Kawada, Hironori Ohwaki
  • Cleaning device for electrophotographic apparatus, electrophotographic apparatus, method for cleaning light receiving member of electrophotographic apparatus, and electrophotographic process comprising the cleaning method
    Patent number: 6055404
    Abstract: In order to prevent uneven shaving of a light receiving member and fusion of a developer, a surface of the light receiving member after development and transfer of the developer is scrape-cleaned with an elastic rubber blade, the wear loss of the light receiving member after copying steps on transfer sheets is within a range of not less than 1 .ANG./10,000 rotations nor more than 10 .ANG./10,000 rotations.
    Type: Grant
    Filed: May 11, 1999
    Date of Patent: April 25, 2000
    Assignee: Canon Kabushiki Kaisha
    Inventors: Koji Yamazaki, Toshiyuki Ehara, Yuji Nakayama, Hironori Ohwaki
  • Potential measuring apparatus and potential measuring method
    Patent number: 5983043
    Abstract: In a surface potential measuring apparatus for measuring a potential configuration by moving a photosensitive body of an image forming apparatus of electrophotographic type and at least one potential sensor relative to each other and by generating dielectric current in the potential sensor due to change in potential on a surface of the photosensitive body and by analyzing the dielectric current, a width of a detecting portion of the potential sensor is smaller than a width of the change in potential to be measured, and a sectional shape of the detecting portion in a plane perpendicular to the surface of the photosensitive body and parallel to the relative movement direction does not include any edge.
    Type: Grant
    Filed: December 22, 1998
    Date of Patent: November 9, 1999
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hironori Ohwaki, Koji Yamazaki, Toshiyuki Ehara, Masaya Kawada, Takaaki Kaya, Tetsuya Karaki