Patents by Inventor Tadakatsu Yokoi

Tadakatsu Yokoi 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).

  • Absolute value encoder and an output correction method of absolute value encoder having a signal processing/control circuit
    Patent number: 5406077
    Abstract: The position of a machine tool or the like is accurately obtained by an absolute value encoder. Light emission elements emit light which passes through scales containing optical patterns and is detected by light receiving elements. First, a signal detected by the light receiving elements while the light emission elements are extinguished is stored in memory. Then, the light emission elements are lighted and the signal detected by the light receiving elements is corrected by the previously stored signal.
    Type: Grant
    Filed: March 29, 1994
    Date of Patent: April 11, 1995
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yukio Aoki, Takao Mizutani, Tsutomu Kazama, Mitsuyasu Kachi, Tadakatsu Yokoi, Hirokazu Sakuma