Energy-trapping piezoelectric resonator

Details Energy-trapping piezoelectric resonator Energy-trapping piezoelectric resonator

1998-04-10

2000-04-25

Dougherty, Thomas M.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

H01L 4108

Patent

active

060547979

ABSTRACT:
An energy-trapping piezoelectric resonator vibrates in a third-order wave of a thickness-extension vibration mode. The piezoelectric resonator includes a piezoelectric substrate polarized along its thickness. A ratio of the width W to the thickness T of the substrate is determined to be about 0.88.+-.5%, 1.06.+-.4%, 1.32.+-.5%, 1.80.+-.3%, 2.30.+-.3%, 2.69.+-.3%, 3.16.+-.2%, or 3.64.+-.2%. First and second electrodes are respectively disposed on the obverse and reverse surfaces of the substrate to cover the entire width and opposedly face each other at the central portion of the substrate in the longitudinal direction so as to form a resonance portion between the first and second electrodes. It is thus possible to obtain a piezoelectric resonator which does not require a large extra area of the substrate around the resonance portion and which exhibits good resonance characteristics by effectively suppressing unwanted spurious responses in a range between and near the resonant frequency and the anti-resonant frequency.

REFERENCES:
patent: 4265841 (1981-05-01), Fujimori et al.
patent: 4367426 (1983-01-01), Kumada et al.
patent: 4486682 (1984-12-01), Nakazawa et al.
patent: 4511202 (1985-04-01), Kasai
patent: 4577132 (1986-03-01), Ohigashi et al.
patent: 5925968 (1999-07-01), Yachi et al.

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