Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1981-11-20
1984-02-28
Rubinson, G. Z.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
179111R, 307400, 29592E, 29594, H04R 1900, H04R 1904
Patent
active
044343272
ABSTRACT:
An electret transducer for producing a directional response, electret foil (92) and a backplate (94) with the actual air gap thickness therebetween varying in accordance with a predetermined relationship. The sensitivity of the electret transducer varies inversely as the actual air gap thickness. In one embodiment the actual air gap thickness is realized by a plurality of posts (90) having heights varying according to the aforesaid relationship. In another embodiment, the actual air gap thickness is realized by varying the thickness of the aforesaid backplate.
REFERENCES:
patent: 3588382 (1971-06-01), Reedyk
patent: 3895194 (1975-07-01), Fraim
patent: 3896274 (1975-07-01), Fraim et al.
patent: 3930128 (1975-12-01), Fidi et al.
patent: 4192977 (1980-03-01), Stamm
"Electrostatic Microphones with Electret Foil", G. M. Sessler, The Journal of the Acoustical Society of America, Sep. 1963, vol. 35, No. 9, pp. 1354-1357.
Busch-Vishniac Ilene J.
Wallace, Jr. Robert L.
West James E.
Bell Telephone Laboratories Incorporated
Byrd Danita R.
Cubert Jack S.
Nimtz Robert O.
Rubinson G. Z.
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