Patents Examined by Cheufkan Lee
  • Light guide optical system, document illuminating device using same, and image reading apparatus using same
    Patent number: 7855815
    Abstract: A light guide optical system guides a plurality of light beams emitted from a plurality of point light sources arranged linearly to a predetermined surface. The light guide optical system has a plurality of optical surfaces arranged periodically in the arrangement direction of the plurality of point light sources. Each of the plurality of optical surfaces has power in the arrangement direction of the plurality of point light sources.
    Type: Grant
    Filed: September 17, 2008
    Date of Patent: December 21, 2010
    Assignee: Canon Kabushiki Kaisha
    Inventors: Tadao Hayashide, Takayuki Sugiyama