Grooved piezoelectric ceramic resonator with two poling directio

Details Grooved piezoelectric ceramic resonator with two poling directio Grooved piezoelectric ceramic resonator with two poling directio

1983-12-15

1985-03-05

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310320, 310368, 310366, 333187, H01L 4108

Patent

active

045033528

ABSTRACT:
An improved piezoelectric ceramic resonator in which spurious vibration other than that in a longitudinal direction of a piezoelectric ceramic plate is suppressed. The directions of polarization of the rectangular piezoelectric ceramic plate at opposite sides of a concave groove provided in the piezoelectric ceramic plate are different from each other, and are unequal in magnitude. A portion of the plate between the oppositely polarized portions is not polarized in any predetermined direction. The resulting arrangement improves a spurious characteristic of the piezoelectric ceramic resonator, and also rectifies an imbalance in selectivity characteristic between a high frequency side and a low frequency side, when the resonator is used in an electrical filter.

REFERENCES:
patent: 2875355 (1959-02-01), Petermann
patent: 3374367 (1968-03-01), Cowan
patent: 3562792 (1971-02-01), Berlincourt et al.
patent: 4019073 (1977-04-01), Vishnevsky et al.
patent: 4368402 (1983-01-01), Torii et al.
patent: 4431938 (1984-02-01), Inoue

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