Electret transducer with variable effective air gap

Details Electret transducer with variable effective air gap Electret transducer with variable effective air gap

1981-11-20

1984-01-31

Pellinen, A. D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

179111R, 29592E, 307400, H04R 1900

Patent

active

044291930

ABSTRACT:
A directional electret transducer comprises an electret foil and a metalized backplate the effective air gap thickness therebetween varying according to a predetermined relationship. The sensitivity of the electret transducer is directly proportional to the effective air gap thickness. The effective air gap thickness is realized in three ways: first, a plurality of equal diameter holes are drilled to varying depths in the aforesaid backplate; second, a plurality of holes of varying diameters are drilled through the aforesaid backplate; third, a plurality of equal diameter holes are drilled through the aforesaid backplate, the density of the holes varying. In each of the aforesaid three ways, the variation is according to the predetermined relationship.

REFERENCES:
patent: 3082298 (1963-03-01), Gorike
patent: 3588382 (1971-06-01), Reedyk
patent: 3895194 (1975-07-01), Fraim
patent: 3896274 (1975-07-01), Fraim et al.
patent: 4192977 (1980-03-01), Stamm
"Electrostatic Micropheres with Electret Foil", G. M. Sessler, The Journal of the Acoustical Society of America, Sep. 1963, vol. 35, No. 9 pp. 1354-1357.

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