Electroacoustic transducers of the bi-laminar flexural vibrating

Details Electroacoustic transducers of the bi-laminar flexural vibrating Electroacoustic transducers of the bi-laminar flexural vibrating

1978-07-25

1980-02-26

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310335, 179110A, H01L 4110

Patent

active

041907833

ABSTRACT:
An improved transducer utilizes an acoustic delay line to reverse the phase f the sound vibrations generated by the peripheral area of a bi-laminar vibratile disc operating at its free fundamental resonance mode. When the diameter of the vibratile disc is dimensioned within specific limits in comparison with the wavelength of sound being radiated at the frequency of operation, the radiation efficiency of the transducer is significantly increased over the efficiency of the same vibratile disc operating in the prior art manner with an acoustic shield placed over the peripheral area of the disc to prevent destructive interference from the out-of-phase sound radiation generated by the peripheral area.

REFERENCES:
patent: 2967957 (1961-01-01), Massa
patent: 3271596 (1966-09-01), Brinkerhoff
patent: 3360664 (1967-12-01), Straube
patent: 3849679 (1974-11-01), Massa
patent: 3937991 (1976-02-01), Massa et al.

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