Electret transducer with variable actual air gap

Details Electret transducer with variable actual air gap Electret transducer with variable actual air gap

H - Electricity

04

R

349/69

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

Patent

CA 1186045

ELECTRET TRANSDUCER WITH VARIABLE ACTUAL AIR GAP Abstract An electret transducer for producing a directional response, electret foil and a backplate with the actual air gap thickness therebetween varying in accordance with a predetermined relationship. The sensitivity of the electret transducer varies inversely as the actual air gap thickness. In one embodiment the actual air gap thickness is realized by a plurality of posts having heights varying according to the aforesaid relationship. In another embodiment, the actual air gap thickness is realized by varying the thickness of the aforesaid backplate.

415535

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