Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1981-03-13
1982-06-01
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310322, 310334, 310335, 310321, 310312, H01L 4108
Patent
active
043330282
ABSTRACT:
A tuned acoustic directional transducer for transmitting and receiving airborne sound, which provides enhanced efficiency and reduced cost without undue narrowing of bandwidth, makes use of an acoustic transducer element (2) coupled to a plate (10) having a higher order flexural mode resonance at approximately the desired frequency of operation, the plate being coupled to the air through low-hysteresis acoustic propagation material having an acoustic impedance much less than that of the plate and much greater than that of the air. The material is disposed so that in the desired direction of propagation there is no substantial reduction of sound intensity in the far field resulting from cancellation occasioned by interaction of sound radiated from adjacent antinodal zones. Preferably the thickness of the material is such that it acts as an efficient acoustic impedance matching transformer. Preferably, the transducer element is piezoelectric and coupled to the center of a circular plate to which the coupling material is applied in rings (16, 18, 20).
REFERENCES:
patent: 1693727 (1928-12-01), Pape
patent: 3578104 (1971-05-01), Sotome
patent: 3674945 (1972-07-01), Hands
patent: 3777192 (1973-12-01), Barrow
patent: 3804329 (1974-04-01), Martner
patent: 3849679 (1974-11-01), Massa
patent: 3890513 (1975-06-01), Barleen
patent: 3891869 (1975-06-01), Scarpa
patent: 4078160 (1978-03-01), Bost
patent: 4190784 (1980-02-01), Massa
"An Ultrasonic Transducer for High Power Applications in Gases," by Gallego-Juarez et al., Ultrasonics, Nov. 1978.
"Ultrasonic Apparatus" by Havant, Research Disclosures Product, Licensing Index, Jun. 1971, No. 86, (British).
Budd Mark O.
Milltronics Ltd.
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