Patents by Inventor Hideki Kitazawa

Hideki Kitazawa 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).

  • Display board illuminating device for passive displays
    Patent number: 5070431
    Abstract: A display board illuminating device includes a light guide plate arranged to face the back of a display board and a light source disposed to face the side end of the light guide plate. The side end of the light guide plate is inclined toward the center of the light guide plate in the direction of the display board. By this configuration an angle of an optical axis refracted at the surface of the side end and incident into the light guide plate with respect to a main surface of the light guide plate, so that the whole area of the display board is illuminated efficiently.
    Type: Grant
    Filed: July 30, 1990
    Date of Patent: December 3, 1991
    Assignee: Pioneer Electronic Corporation
    Inventors: Hideki Kitazawa, Ryohei Terada, Shogo Takeuchi, Tsutomu Kayama, Kohichi Tanimoto, Nobuo Utsugi, Yoshiaki Nagai