Electret transducer with variable effective air gap

Details Electret transducer with variable effective air gap Electret transducer with variable effective air gap

H - Electricity

04

R

349/69

H04R 19/01 (2006.01) G01H 11/06 (2006.01) G10K 11/32 (2006.01)

Patent

CA 1186046

-- 25 -- ELECTRET TRANSDUCER WITH VARIABLE EFFECTIVE AIR GAP Abstract A directional electret transducer comprises an electret foil and a metalized backplate the effective air gap thickness therebetween varying according to a predetermined relationship. The sensitivity of the electret transducer is directly proportional to the effective air gap thickness. The effective air gap thickness is realized in three ways: first, a plurality of equal diameter holes are drilled to varying depths in the aforesaid backplate; second, a plurality of holes of varying diameters are drilled through the aforesaid backplate; third, a plurality of equal diameter holes are drilled through the aforesaid backplate, the density of the holes varying. In each of the aforesaid three ways, the variation is according to the predetermined relationship.

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