Temperature-stable electret microphone with embossed, small area

Details Temperature-stable electret microphone with embossed, small area Temperature-stable electret microphone with embossed, small area

1978-03-06

1979-02-27

Stellar, George G.

H04R 1904

Patent

active

041420730

ABSTRACT:
Temperature-stable electret microphone with a metallized plastic film stretched over a polarized plastic film and fastened to an underlying fixed electrode, the polarized plastic film being on at least one side embossed with a relief pattern, having a smaller area than the underlying fixed electrode and being concentrically fixed to this by the metallized plastic film.

REFERENCES:
patent: RE28420 (1975-05-01), Murphy
patent: 3328653 (1967-06-01), Wolf, Jr.
patent: 3821490 (1974-06-01), Bobb
patent: 4063050 (1977-12-01), Carlson et al.
patent: 4070741 (1978-01-01), Djuric

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