Patents by Inventor Fumiyo Tojo

Fumiyo Tojo 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).

  • Piezoelectric film device, and driving method of the same
    Patent number: 7288877
    Abstract: A piezoelectric film device has a piezoelectric film element and a power supply circuit. The piezoelectric film element is formed of a first electrode, a second electrode, and a piezoelectric film that is sandwiched between the first electrode and second electrode and has a polarization vector in the film thickness direction. The polarization vector is inverted by application of a predetermined voltage or higher through the first electrode and second electrode. The power supply circuit supplies voltage for inverting the polarization vector. The piezoelectric film has each different lattice constant depending on the direction of the polarization vector. The piezoelectric film device keeps a different displacement position corresponding to the direction of the polarization vector even when the voltage application is stopped.
    Type: Grant
    Filed: December 16, 2004
    Date of Patent: October 30, 2007
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hiroyuki Kita, Hirokazu Uchiyama, Toshiyuki Matsunaga, Fumiyo Tojo
  • Piezoelectric film device, and driving method of the same
    Publication number: 20050140249
    Abstract: A piezoelectric film device has a piezoelectric film element and a power supply circuit. The piezoelectric film element is formed of a first electrode, a second electrode, and a piezoelectric film that is sandwiched between the first electrode and second electrode and has a polarization vector in the film thickness direction. The polarization vector is inverted by application of a predetermined voltage or higher through the first electrode and second electrode. The power supply circuit supplies voltage for inverting the polarization vector. The piezoelectric film has each different lattice constant depending on the direction of the polarization vector. The piezoelectric film device keeps a different displacement position corresponding to the direction of the polarization vector even when the voltage application is stopped.
    Type: Application
    Filed: December 16, 2004
    Publication date: June 30, 2005
    Inventors: Hiroyuki Kita, Hirokazu Uchiyama, Toshiyuki Matsunaga, Fumiyo Tojo