Electret microphone shield

Details Electret microphone shield Electret microphone shield

1981-10-19

1984-01-03

Rubinson, G. Z.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

179184, 179187, 179188, 307400, H04R 1904

Patent

active

044244193

ABSTRACT:
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.

REFERENCES:
patent: 3944756 (1976-03-01), Lininger
patent: 4046974 (1976-10-01), Baumhauer et al.
Journal of Microwave Power, vol. 5, No. 3, 1970, Dan R. McConnell et al., "A Dielectric Filled Inserted Choke Seal for the Microwave Oven", pp. 183-187.

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