Patents by Inventor Tsunehiro Hirabayashi

Tsunehiro Hirabayashi 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).

  • Liquid crystal device, driving method thereof, liquid crystal apparatus, and illumination apparatus
    Patent number: 5631665
    Abstract: An illumination apparatus includes a liquid crystal device (L) disposed in the optical path of light projected from a light source (P) and a driving circuit (D) connected to the liquid crystal device for applying a special driving voltage to a composite film (1) of the device (L). The applied driving voltage alternately causes the composite film (1) to attain an opaque state and a transparent state. The time periods of the alternating voltage pulses are varied, thereby changing the ratio of the duration of the opaque state to the duration of the transparent state per unit time period, and thus controlling the power of light transmitted through the composite film (1) without undesirably altering the color spectrum of the transmitted light.
    Type: Grant
    Filed: June 28, 1994
    Date of Patent: May 20, 1997
    Assignees: Nippon Hoso Kyokai, Sumitomo Electric Industries, Ltd.
    Inventors: Kuniharu Takizawa, Hideo Fujikake, Tsunehiro Hirabayashi, Yoshiaki Tanaka, Kensaku Takata, Satoshi Takano, Tohru Kashiwagi