Waterproof sound-transmitting membrane and waterproof sound-transmitting structure using the same
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United States of America Patent
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Jul 30, 2019
Grant Date -
Oct 13, 2016
app pub date -
Nov 14, 2014
filing date -
Nov 18, 2013
priority date (Note) -
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Abstract
A waterproof sound-transmitting membrane (10) includes a sound-transmitting region (13c) having a porous polytetrafluoroethylene (PTFE) membrane (11). The porous PTFE membrane (11) has a through-thickness air permeability of 2 cm3/cm2/s or more. Thus, it is possible to provide a waterproof sound-transmitting membrane that is suitable for reducing crackling noise while ensuring waterproofness required for at least daily use. The porous PTFE membrane (11) has a water entry pressure of 3 kPa or more, preferably 20 kPa or more and 50 kPa or less. The waterproof sound-transmitting membrane (10) may include an edge region (13p) having an adhesive layer (12).
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