Piezoelectric resonator
AssigneeMurata Manufacturing Co., Ltd.
InventorsRyuhei Yoshida, Masaya Wajima, Kenichi Sakai
Life of this patent
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Abstract
A piezoelectric resonator adapted to generate a third harmonic wave of a thickness extensional vibration mode in which the fundamental wave is lead out of the vibrating portion and suppressed effectively. The piezoelectric resonator includes a vibrating portion with vibration electrodes opposing each other in the middle of a piezoelectric plate, lead-out electrodes electrically connected to the vibration electrodes, and a floating electrode disposed along the short side edge on at least one major surface of the piezoelectric plate or in the vicinity of the edge.
Claims20
A piezoelectric resonator, comprising:
- a piezoelectric plate including a first major surface and a second major surface;
- first and second vibration electrodes partially disposed on said first major surface and said second major surface of said piezoelectric plate, respectively and arranged so as to oppose each other via said piezoelectric plate;
- first and second lead-out electrodes electrically connected to said first and said second vibration electrodes, respectively;
- and
- at least one floating electrode disposed along or near an edge on a short side of said piezoelectric plate on at least one of said first major surface and said second major surface of said piezoelectric plate, the floating electrode being constructed and arranged to damp a fundamental wave of a thickness extensional vibration mode;
- wherein
- the piezoelectric plate, the first and second vibration electrodes, the first and second lead-out electrodes and the at least one floating electrode are arranged such that the piezoelectric resonator generates a third harmonic wave of a thickness extensional vibration mode.
A piezoelectric resonator, comprising:
- a piezoelectric plate including a first major surface and a second major surface;
- first and second vibration electrodes partially disposed on said first major surface and said second major surface of said piezoelectric plate, respectively and arranged so as to oppose each other via said piezoelectric plate;
- first and second lead-out electrodes electrically connected to said first and said second vibration electrodes, respectively;
- and
- at least one floating electrode disposed along or near an edge on a short side of said piezoelectric plate on at least one of said first major surface and said second major surface of said piezoelectric plate and arranged to make a fundamental wave produced in the piezoelectric plate during operation lead out of a vibrating portion of the resonator, the floating electrode being constructed and arranged to damp the fundamental wave of a thickness extensional vibration mode;
- wherein
- the piezoelectric plate, the first and second vibration electrodes, the first and second lead-out electrodes and the at least one floating electrode are arranged such that the piezoelectric resonator generates a third harmonic wave of a thickness extensional vibration mode.
Dependencies are inferred from the claim text.