Patents by Inventor Kazuhira Nakao

Kazuhira Nakao 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).

  • Optical rotary encoder
    Patent number: 4654525
    Abstract: An optical rotary encoder includes a slit plate having a plurality of circumferentially aligned slits of a pitch P, a light emitting diode, and a light responsive section. The light responsive section includes four photodiodes formed on a single substrate. The four photodiodes are aligned in the tangential direction of the slit plate with the interval corresponding to 1/4 P. Output signals derived from each of the four photodiodes are introduced into a detection circuit for determining the angular position and velocity of a rotating shaft to which the slit plate is secured.
    Type: Grant
    Filed: August 10, 1983
    Date of Patent: March 31, 1987
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Kiyoshi Ebina, Kazuhira Nakao, Zempei Tani