Moisture resistant microphone
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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N/A
Issued Date -
Jan 4, 2007
app pub date -
May 19, 2006
filing date -
Jun 30, 2005
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Embodiments of the invention provide microphone assemblies which are resistant to moisture. One embodiment provides a microphone assembly comprising a housing, a diaphragm disposed in the housing and a backplate disposed in the housing. The housing includes a sound inlet port for the entry of sound waves. The backplate includes a surface and an electret portion having an embedded permanent charge. The diaphragm is configured to vibrate in response to sound waves entering the housing. The vibrations of the diaphragm interact with the electret portion to produce an electrical signal associated with the sound waves entering the housing. A hydrophobic coating can be applied to one or both of the backplate and diaphragm surfaces so as to reduce condensation and/or wetting of the backplate. This minimizes neutralization of an electric field of the backplate surface from condensation preserving the field and the function of the microphone in humid environments.
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