Patents by Inventor Toru Nagae

Toru Nagae 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).

  • Patent number: 6515401
    Abstract: A piezoelectric resonator which achieves a compact oscillator with high performance having high thermal resistance and a narrow tolerance includes an element body having an excitation layer and a non-excitation layer. One vibration electrode is provided on the surface of the excitation layer and another vibration electrode is provided between the excitation layer and the non-excitation layer. The two vibration electrodes extend from opposing ends of the excitation layer toward the approximate central portion thereof so as to oppose each other at the approximate central portion of the excitation layer. On end-surfaces of the element body, end-surface electrodes are connected to the vibration electrodes, respectively.
    Type: Grant
    Filed: October 30, 2000
    Date of Patent: February 4, 2003
    Assignee: Murata Manufacturing Co., LTD
    Inventors: Akira Ando, Masahiko Kimura, Takuya Sawada, Jiro Inoue, Hiroaki Kaida, Toru Nagae
  • Patent number: 6201337
    Abstract: A thickness-extensional piezoelectric resonator using a harmonic of a thickness-extensional vibration mode has a compact size, large electric capacity, is not affected by the stray capacitance of a circuit board, and has small variations in resonance characteristics. The thickness-extensional piezoelectric resonator includes a piezoelectric body, a first excitation electrode, a second excitation electrode, a terminal electrode and a connection electrode disposed on outer surfaces of the piezoelectric body, as well as an internal electrode inside of the piezoelectric body. Portions where the first excitation electrode, the second excitation electrode and the internal electrode overlap define a resonating portion. In the length direction of the piezoelectric body, a vibration-attenuating portion is defined at opposite sides of the resonating portion, whereas in the width direction, the vibration-attenuating portion is not provided at each side thereof. In addition, a relationship of Go/D≧2.
    Type: Grant
    Filed: December 1, 1999
    Date of Patent: March 13, 2001
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Hiroaki Kaida, Toru Nagae
  • Patent number: 6198200
    Abstract: A thickness extensional vibration piezoelectric resonator includes a strip-type, substantially rectangular plate-shaped piezoelectric body, first and second excitation electrodes disposed on both sides of the piezoelectric body, the back side and the front sides thereof being opposed to each other with the piezoelectric body disposed therebetween, and an internal electrode disposed in the piezoelectric body. The resonator portion where the first and second excitation electrodes and the internal electrode are opposed to each other define a resonance portion. In the longitudinal direction (a first direction) of the piezoelectric body, vibration-attenuating portions are provided on both sides of the resonance portion. The ratio L/D is within the range of about 9.0 to about 14.0, in which L is the length in the longitudinal direction of the piezoelectric body, T is the thickness, and wherein D=T/N.
    Type: Grant
    Filed: November 3, 1999
    Date of Patent: March 6, 2001
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Hiroaki Kaida, Toru Nagae