Electret transducer with a selectively metalized backplate

Details Electret transducer with a selectively metalized backplate Electret transducer with a selectively metalized backplate

H - Electricity

04

R

349/69

H04R 19/01 (2006.01) G01H 11/06 (2006.01)

Patent

CA 1186044

- 25 - ELECTRET TRANSDUCER WITH A SELECTIVELY METALIZED BACKPLATE Abstract An electret transducer comprises an electrostatically charged electret foil superimposed directly over a selectively metalized rough surface of a backplate. Selective metalization is realized by depositing a thin metal layer, the contour of which is defined by a predetermined relationship, over the rough surface. 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.

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