Patents by Inventor Junji Terauchi

Junji Terauchi 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 ceramics
    Patent number: 6551522
    Abstract: Piezoelectric ceramics include a bismuth layer compound containing MII, Bi, Ti, Ln and O, wherein MII represents at least one element selected from the group consisting of Sr, Ba and Ca, and Ln represents at least one element selected from the group consisting of lanthanoids. The piezoelectric ceramics include MIIBi4Ti4O15 typed crystals, and a mole ratio of Ln/(Ln+MII) is 0<Ln/(Ln+MII)<0.5. In the case where MII is Sr, a mole ratio of 4Bi/Ti is 4.000<4Bi/Ti≦4.030. Preferably, piezoelectric ceramics further include Y oxide.
    Type: Grant
    Filed: February 7, 2001
    Date of Patent: April 22, 2003
    Assignee: TDK Corporation
    Inventors: Masakazu Hirose, Takeo Tsukada, Hitoshi Oka, Junji Terauchi
  • Piezoelectric ceramic material
    Patent number: 6461532
    Abstract: A piezoelectric ceramic material comprising a bismuth layer compound containing MII, Bi, Ti and O wherein MII is selected from Sr, Ba and Ca, and containing MIIBi4Ti4O15 type crystals, wherein MII, is represented by SrxBayCaz wherein x+y+z=1, utilizes thickness shear vibration when 0≦x≦ 1, 0≦y≦0.9, and 0≦z≦1, and thickness extensional vibration when 0≦x<0.9, 0≦y≦0.9, and 0≦z<1. Also provided is a piezoelectric ceramic material comprising a bismuth layer compound containing Ca, Bi, Ti, Ln and 0 wherein Ln is a lanthanoid, and containing CaBi4Ti4O15 type crystals, wherein the atomic ratio Ln/(Ln+Ca) is in the range: 0<Ln/(Ln+Ca)<0.5. These piezoelectric ceramic materials are free of lead, and have a high Curie point and improved piezoelectric characteristics.
    Type: Grant
    Filed: October 27, 2000
    Date of Patent: October 8, 2002
    Assignee: TDK Corporation
    Inventors: Hitoshi Oka, Masakazu Hirose, Yasuo Watanabe, Junji Terauchi
  • Piezoelectric ceramics
    Publication number: 20010015420
    Abstract: Piezoelectric ceramics include a bismuth layer compound containing MII, Bi, Ti, Ln and O, wherein MII represents at least one element selected from the group consisting of Sr, Ba and Ca, and Ln represents at least one element selected from the group consisting of lanthanoids. The piezoelectric ceramics include MIIBi4Ti4O15 typed crystals, and a mole ratio of Ln/(Ln+MII) is 0<Ln/(Ln+MII)<0.5. In the case where MII is Sr, a mole ratio of 4Bi/Ti is 4.000<4Bi/Ti≦4.030. Preferably, piezoelectric ceramics further include Y oxide.
    Type: Application
    Filed: February 7, 2001
    Publication date: August 23, 2001
    Applicant: TDK CORPORATION
    Inventors: Masakazu Hirose, Takeo Tsukada, Hitoshi Oka, Junji Terauchi