Highly directional ultrasonic electret transducer

Details Highly directional ultrasonic electret transducer Highly directional ultrasonic electret transducer

1977-12-16

1980-03-11

Stellar, George G.

Weighing scales

Weigher responsive material control

With external intercontrol

177121D, 73632, H04R 134, H04R 1900

Patent

active

041929772

ABSTRACT:
An ultrasonic converter having a single side, focused, substantially secondary radiation free directional characteristic, comprises an exponential horn-like directional element and a capacitative transducer with an electret diaphragm. A pre-staged resonator aids in controlling the directional characteristic. The capacitive transducer has an approximately bell-shaped curvature-like diaphragm velocity distribution which tapers off toward the diaphragm edge to improve the focusing which is achieved by employing a non-uniform charge across the surface of the electret diaphragm tapering off toward its edge and a backplate arrangement which supports the diaphragm at a plurality of selected points with a selected dimensioning of singular volumes behind the counter-electrode bores.

REFERENCES:
patent: Re28420 (1975-05-01), Murphy
patent: 1811638 (1931-06-01), Lieber
patent: 2063944 (1936-12-01), Pierce
patent: 2542594 (1951-02-01), Tiffany
patent: 3835254 (1974-09-01), Ohasi et al.

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