Electret transducers: acoustically transparent backplate of sint

Details Electret transducers: acoustically transparent backplate of sint Electret transducers: acoustically transparent backplate of sint

1977-12-28

1979-07-10

Stellar, George G.

29594, H04R 1900

Patent

active

041608810

ABSTRACT:
A motor assembly for an electret transducer, wherein spacing means supporting the diaphragm plate on the backplate are manufactured from a separate material which is applied on the backplate surface to achieve an accurately defined and reproduceable spacing therebetween. Such spacing means can be formed as a meshlike screen lying on the backplate surface. In an alternative embodiment wherein the backplate is constituted by substantially spherical, conductive particles sintered together, the spacing means are formed by an acoustical porous coating applied on the backplate surface, which coating also acts as an electret.

REFERENCES:
patent: RE28420 (1975-05-01), Murphy
patent: 2192653 (1940-03-01), Schenk
patent: 3108162 (1963-10-01), Schindler
patent: 3740496 (1973-06-01), Carlson et al.
patent: 3783202 (1974-01-01), Bobb

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