Patents Assigned to Shigeru Sakai
  • Methods for controlling the elastic modulus of piezoelectric substances and apparatus therefor
    Patent number: 6018210
    Abstract: The elastic modulus of a piezoelectric substance is controlled over a wide range using a simple method. The effective modulus (the real part of the elastic modulus) and the energy loss modulus (the imaginary part of the elastic modulus) of the piezoelectric substance are changed by installing electrodes on the surface of the piezoelectric substance and by connecting a mechanism consisting of one or more circuit elements to each of the electrodes.
    Type: Grant
    Filed: August 29, 1997
    Date of Patent: January 25, 2000
    Assignees: The Institute of Physical and Chemical Research (Riken), Munehiro Date, Shigeru Sakai
    Inventors: Munehiro Date, Masayuki Kutani, Shigeru Sakai