Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
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
044291892
ABSTRACT:
An electret transducer comprises an electrostatically charged electret foil (10) superimposed directly over a selectively metalized rough surface (16) of a backplate (18). Selective metalization is realized by depositing a thin metal layer (20), the contour of which is defined by a predetermined relationship, over the rough surface (16). The sensitivity of the electret transducer at any point thereon is directly proportional to the width of the metal layer on the backplate. The response characteristic of the electret transducer comprises a main lobe and a plurality of sidelobes below a preselected threshold.
REFERENCES:
patent: 3588382 (1971-06-01), Reedyk
patent: 3895194 (1975-07-01), Fraim
patent: 3908098 (1975-09-01), Kawakami et al.
patent: 4188513 (1980-02-01), Morrell et al.
patent: 4192977 (1980-03-01), Stamm
Bell Laboratories Record, "The Foil Electret Microphone", by Sessler and West, Aug. 1969, vol. 47, pp. 245-248.
Berkley David A.
Busch-Vishniac Ilene J.
Wallace, Jr. Robert L.
West James E.
Bell Telephone Laboratories Incorporated
Byrd Danita R.
Cubert Jack S.
Nimtz Robert O.
Pellinen A. D.
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