Patents by Inventor Keiji Fujimura

Keiji Fujimura 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).

  • Rain sensor with improved avoidance of reflected light
    Patent number: 4987296
    Abstract: A rain sensor operates such that when a raindrop cuts off a direct light beam from a transmitter to a detector, the output level of the detector is lowered. A convex member is disposed to prevent a portion of the light emitted from the transmitter from reflecting and then reaching the detector. Thus, detecting error due to such reflected light is reduced.
    Type: Grant
    Filed: August 10, 1989
    Date of Patent: January 22, 1991
    Assignee: Fujitsu Ten Limited
    Inventors: Hideki Kajioka, Yasuhiro Fujita, Keiji Fujimura