Patents by Inventor Kiyofumi Arai

Kiyofumi Arai 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).

  • Optical scan apparatus, image formation apparatus, optical deflector manufacturing method, polygon mirror processing method, and polygon mirror processing apparatus
    Patent number: 7898709
    Abstract: In the optical deflector, the mean width of profile elements of a cross section of the deflection surface in the sub scan direction is set to be less than the spacing between spots of the light beams formed in the sub scan direction of the deflection surface. This makes it possible to prevent a variation in the size and shape of the spots of the light beams deflected by the deflection surface due to the undulation (unevenness) of the deflection surface. As a result, it is able to suppress a decrease of the granularity of images and form images with high quality.
    Type: Grant
    Filed: January 11, 2008
    Date of Patent: March 1, 2011
    Assignee: Ricoh Company, Ltd.
    Inventors: Kensuke Masuda, Yukio Itami, Hisashi Inada, Kiyofumi Arai, Takeshi Kikuchi, Yoshihiro Takahashi, Tomotaka Takamura
  • OPTICAL SCAN APPARATUS, IMAGE FORMATION APPARATUS, OPTICAL DEFLECTOR MANUFACTURING METHOD, POLYGON MIRROR PROCESSING METHOD, AND POLYGON MIRROR PROCESSING APPARATUS
    Publication number: 20080174843
    Abstract: In the optical deflector, the mean width of profile elements of a cross section of the deflection surface in the sub scan direction is set to be less than to spacing between spots of the light beams formed in the sub scan direction of the deflection surface. This makes it possible to prevent a variation in the size and shape of the spots of the light beams deflected by the deflection surface due to the undulation (unevenness) of the deflection surface. As a result, it is able to suppress a decrease of the granularity of images and form images with high quality.
    Type: Application
    Filed: January 11, 2008
    Publication date: July 24, 2008
    Inventors: Kensuke Masuda, Yukio Itami, Hisashi Inada, Kiyofumi Arai, Takeshi Kikuchi, Yoshihiro Takahashi, Tomotaka Takamura