Piezo-resonator

Details Piezo-resonator Piezo-resonator

1994-09-26

1996-01-02

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310320, 310358, H01L 4108

Patent

active

054811546

ABSTRACT:
First and second grooves (15, 16) are formed in upper and lower surfaces of a piezoelectric ceramic plate (12), which is polarized in a direction P parallel to its major surfaces, respectively. A resonance part is formed between the first and second grooves (15, 16), so that first and second resonance electrodes (13, 14) which are provided on the upper and lower surfaces of the piezoelectric ceramic plate (12) respectively are opposed to each other through the piezoelectric ceramic plate (12). In this energy trap type piezo-resonator utilizing a thickness shear mode, the resonance part has a pair of rectangular side surfaces, and the first and second grooves (15, 16) are so formed that a ratio b/a is in a range of .+-.10% from the following value:

REFERENCES:
patent: 3745385 (1973-07-01), Nakajima et al.
patent: 4356421 (1982-10-01), Shimizu et al.
patent: 4384229 (1983-05-01), Inoue et al.
patent: 5091671 (1992-02-01), Yoshida
patent: 5117147 (1992-05-01), Yoshida
patent: 5118980 (1992-06-01), Takahashi
patent: 5121024 (1992-06-01), Seto
Great Britain Search Report dated Dec. 21, 1994.

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