Flexural transducer

Details Flexural transducer Flexural transducer

1979-11-13

1981-07-28

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310357, 310370, 333189, 333197, 333200, H03H 9125, H03H 950, H03H 954, H01L 4118

Patent

active

042812984

ABSTRACT:
A flexural electromechanical transducer composed of a constant-modulus alloy material and a piezoelectric ceramic material having a high electromechanical coupling coefficient. In the transducer, the piezoelectric ceramic material is polarized in one direction and a specified frequency signal is applied to the piezoelectric ceramic material in a direction parallel to the residual polarization direction of the piezoelectric material for obtaining a thickness-shear vibration. The thickness-shear vibration of the piezoelectric material in turn causes the flexural vibration of the transducer. The transducer achieves a high quality factor Q, a low capacitance ratio r, good spurious characteristics, and low impedance.

REFERENCES:
patent: 3376521 (1968-04-01), Traub
patent: 3408514 (1968-10-01), Adamietz et al.
Japanese Unexamined Utility Model Publication, No. JITSUGANSO 54-35713, filed Oct. 30, 1972, Laid Open Sep. 12, 1979 as JIKKAISHO 54-131446, Applicant-Nippon Telegraph and Telephone Public Corp.

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