Electret microphone shield

Details Electret microphone shield Electret microphone shield

H - Electricity

04

R

349/66

H04R 17/02 (2006.01) H04R 19/01 (2006.01)

Patent

CA 1165859

ELECTRET MICROPHONE SHIELD Abstract of the Disclosure An electret microphone has a metal shield around it in order to guard against electromagnetic interference. Acoustic waves reach the electret element through a passage in the shield. The electret response is undesirably affected by an electric field produced by body capacitance when the microphone is brought close to a user's mouth. To overcome this effect, the microphone has a conductive film, transparent to acoustic waves, positioned between the passage and the electret element, the film contacting a grounded part of the casing. The conductive film can form an integral part of a microphone moisture barrier. - i -

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