Patents by Inventor Masata Yokoyama

Masata Yokoyama 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 and method for color image forming, and computer program product for driver controller
    Patent number: 7373093
    Abstract: A color image forming apparatus including a plurality of photosensitive drums on which toner images of different colors are respectively formed. An endless belt confronts the plurality of photosensitive drums. A drive source drives rotation of the endless belt, or alternatively plural drive sources drive the photosensitive drums to individually rotate. A memory stores pre-measured characteristics of a color misregistration of a color image in a sub-scanning direction of the apparatus, the color image formed by transferring images from respective of the plurality of photosensitive drums. Further, a control unit changes an average running speed of the endless belt, or alternatively an average running speed of at least some of the photosensitive drums, by controlling the drive sources, to compensate for color misregistration, based on the stored characteristics of color misregistration. The belt can either transport a paper sheet or have a color image formed thereon as an intermediate transfer device.
    Type: Grant
    Filed: April 13, 2005
    Date of Patent: May 13, 2008
    Assignee: Ricoh Company, Ltd.
    Inventors: Tadashi Shinohara, Masata Yokoyama, Kazuhiko Kobayashi, Yohei Miura, Toshiyuki Yakahashi, Yuji Matsuda, Jun Hosokawa, Nobuto Yokokawa, Toshiyuki Andoh
  • Apparatus and method for color image forming, and computer program product for driver controller
    Publication number: 20050238372
    Abstract: A color image forming apparatus including a plurality of photosensitive drums on which toner images of different colors are respectively formed. An endless belt confronts the plurality of photosensitive drums. A drive source drives rotation of the endless belt, or alternatively plural drive sources drive the photosensitive drums to individually rotate. A memory stores pre-measured characteristics of a color misregistration of a color image in a sub-scanning direction of the apparatus, the color image formed by transferring images from respective of the plurality of photosensitive drums. Further, a control unit changes an average running speed of the endless belt, or alternatively an average running speed of at least some of the photosensitive drums, by controlling the drive sources, to compensate for color misregistration, based on the stored characteristics of color misregistration. The belt can either transport a paper sheet or have a color image formed thereon as an intermediate transfer device.
    Type: Application
    Filed: April 13, 2005
    Publication date: October 27, 2005
    Inventors: Tadashi Shinohara, Masata Yokoyama, Kazuhiko Kobayashi, Yohei Miura, Toshiyuki Yakahashi, Yuji Matsuda, Jun Hosokawa, Nobuto Yokokawa, Toshiyuki Andoh