Electret transducer with variably charged electret foil

Details Electret transducer with variably charged electret foil Electret transducer with variably charged electret foil

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

044291914

ABSTRACT:
An electret transducer for producting a highly directional response characteristic comprises a backplate (18) and, superimposed thereon, an electrostatically charged electret foil (10). The electrostatic charge varies according to a predetermined relationship. The sensitivity of the electret transducer, at any point thereon, is directly proportional to the electrostatic charge on the electret foil at that point.

REFERENCES:
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
patent: 4249043 (1981-02-01), Morgan et al.
"Electrostatic Microphones with Electret Foil", G.M. Sessler, The Journal of Acoustical Society of America, Sep. 1963, vol. 35, No. 9, pp. 1354-1357.

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