Patents Represented by Attorney, Agent or Law Firm Knoble Yoshida & Dunleav
  • Projector with adjustably positioned image plate
    Patent number: 6830341
    Abstract: A projector is often positioned so that its optical axis is at an imperfect orthogonal angle with respect to a projection screen. This position causes a keystone distortion as well as imperfect focus in the projected image. To correct these undesirable problems, initially, a lens and/or an image-forming plate is independently repositioned to bring the projected image into focus based upon user input data. The keystone distortion is also corrected by redrawing the image on an image-forming surface based upon additional user input data.
    Type: Grant
    Filed: April 25, 2003
    Date of Patent: December 14, 2004
    Assignee: Ricoh Co., Ltd.
    Inventors: Koichi Ejiri, Takao Yamaguchi, Shin Aoki, Haike Guan