Patent ID: 9578402
Date: 2017-02-21
CPC Classifications: B32B,H04M,H04R,Y10T

Claim:
1. A waterproof sound-transmitting membrane comprising: a porous membrane containing polytetrafluoroethylene as a main component; and a supporting member that is joined to the porous membrane placed thereon and supports the porous membrane, the supporting member being not subjected to stretching after the porous membrane is placed thereon, wherein the supporting member is a mesh or a net having a fiber diameter of 45 to 60 μm and an opening size of 700 to 1100 μm across the supporting member, and a water entry pressure of the waterproof sound-transmitting membrane is 20 kPa or more as measured according to the method B (high hydraulic pressure method) of JIS L1092.