Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1981-11-20
1984-01-31
Rubinson, G. Z.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
29592E, 179111R, 307400, H04R 1900
Patent
active
044291922
ABSTRACT:
An acoustic transducer for producing highly directional characteristics comprises a metalized backplate (130) facing the flat surface (134) of an electrostatically charged electret foil (132). The thickness of the electret foil varies along the length thereof according to a predetermined relationship. The sensitivity of the electret transducer varies directly with the thickness of the electret foil.
REFERENCES:
patent: 3588382 (1971-06-01), Reedyk
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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