Thickness extensional vibration mode piezoelectric resonator

Details Thickness extensional vibration mode piezoelectric resonator Thickness extensional vibration mode piezoelectric resonator

1998-06-01

2000-04-18

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310320, 310365, 310366, 310358, 310359, H01L 4108

Patent

active

060519169

ABSTRACT:
An energy-trap thickness extensional vibration mode piezoelectric resonator utilizes a harmonic of a thickness extensional vibration mode achieves excellent resonant characteristics that are hardly affected by portions of the resonator which are physically supported. The energy-trap thickness extensional vibration mode piezoelectric resonator includes a piezoelectric strip, first and second excitation electrodes located on opposite surfaces of the piezoelectric strip, and an internal electrode disposed inside the piezoelectric strip. The first and second excitation electrodes are located on opposite ends of the piezoelectric strip in an overlapping arrangement. The internal electrode is located opposite to the first and second excitation electrodes. The resonator is designed so that a ratio L/d is not less than about 14, where L is the dimension of the piezoelectric strip 2 in the longitudinal direction, t is the thickness, and d=t
.

REFERENCES:
patent: 3699484 (1972-10-01), Berlincourt
patent: 4384229 (1983-05-01), Inoue et al.
patent: 4608509 (1986-08-01), Yamamoto et al.
patent: 4757581 (1988-07-01), Yamada et al.
patent: 4894580 (1990-01-01), Ogawa
patent: 5045744 (1991-09-01), Ando et al.

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