Hybrid supported acoustic membrane assembly
An assembly ( 10 ) includes a first support member ( 15 ) having a plurality of first apertures ( 50 ); a second support member ( 20 ) having a plurality of second apertures ( 55 ); and a polymer membrane ( 25 ) disposed between the first support member ( 15 ) and the second support member ( 20 ). The polymer membrane ( 25 ) is spaced from the first support member ( 15 ) by a first distance ( 30 ) and from the second support member ( 20 ) by a second distance ( 35 ). Each of the first distance or the second distance is from 10 μm to 100 μm. The assembly provides a standard deviation of insertion loss of 0.8 dB or less over a frequency range of 200 Hz to 10,000 Hz after a water entry pressure (WEP) test.
1 . An assembly, comprising:
a first support member having a plurality of first apertures; wherein the first support member has a percentage open area that ranges from 10% to 40%;
a second support member having a plurality of second apertures;
a polymer membrane disposed between the first support member and the second support member;
wherein the polymer membrane is spaced from the first support member by a first distance and is spaced from the second support member by a second distance;
wherein the first distance is from 10 μm to 100 μm; and
wherein the second distance is from 10 μm to 100 μm;
wherein the assembly is configured to provide a standard deviation of insertion loss of between 0.05 and 0.3 dB over a frequency range of 200 Hz to 10,000 Hz after a water entry pressure (WEP) test.
2 . The assembly of claim 1 , wherein the polymer membrane comprises polyolefins, polyurethanes, polyesters, polyamides, polyketones, polysulfones, polycarbonates, fluoropolymers, or any combination thereof.
3 . The assembly of claim 1 , wherein at least one of the first support member or the second support member comprises a metal, a polymer, fiberglass, or any combination thereof.
4 . The assembly of claim 1 , wherein:
a diameter of at least one aperture of the plurality of first apertures is from 1 μm to 200 μm; and
a diameter of at least one aperture of the plurality of second apertures is from 1 μm to 200 μm.
5 . The assembly of claim 1 , wherein at least one of:
the plurality of first apertures includes 90 to 100 apertures; or
the plurality of second apertures includes 5 to 10 apertures.
6 . The assembly of claim 1 , comprising a plurality of adhesives, wherein:
the first distance is defined by a thickness of a first of the plurality of adhesives; and
the second distance is defined by a thickness of a second of the plurality of adhesives.
7 . The assembly of claim 1 , wherein the first support member and the second support member are different.
8 . The assembly of claim 1 , wherein at least one of:
the first support member is a rigid body that does not deform under 3 bar of water pressure; or
the second support member is a rigid body that does not deform under 3 bar of water pressure.
9 . The assembly of claim 1 , wherein the second support member is thicker than the first support member.
10 . An assembly, comprising:
an acoustic device;
a first support member having a plurality of first apertures; wherein the first support member has a percentage open area that ranges from 10% to 40%;
a second support member having a plurality of second apertures; and
a polymer membrane disposed between the first support member and the second support member;
wherein the polymer membrane is spaced from the first support member by a first distance and is spaced from the second support member by a second distance;
wherein the first distance is from 10 μm to 100 μm; and
wherein the second distance is from 10 μm to 100 μm; and
wherein the assembly is configured to provide a standard deviation of insertion loss of between 0.05 and 0.3 dB over a frequency range of 200 Hz to 10,000 Hz after a water entry pressure (WEP) test.
11 . The assembly of claim 10 , wherein the polymer membrane comprises expanded polytetrafluoroethylene (ePTFE).
12 . The assembly of claim 10 , wherein at least one of the first support member or the second support member comprises a metal, a polymer, fiberglass, or any combination thereof.
13 . The assembly of claim 10 , wherein:
a diameter of at least one aperture of the plurality of first apertures is from 1 μm to 200 μm, and
a diameter of at least one aperture of the plurality of second apertures is from 1 μm to 200 μm.
14 . The assembly of claim 10 , wherein at least one of:
the plurality of first apertures includes 90 to 100 apertures; or
the plurality of second apertures includes from 5 to 10 apertures.
15 . The assembly of claim 10 , comprising a plurality of adhesives, wherein:
the first distance is defined by a thickness of a first of the plurality of adhesives; and
the second distance is defined by a thickness of a second of the plurality of adhesives.
16 . The assembly of claim 10 , wherein at least one of:
the first support member is a rigid body that does not deform under 3 bar of water pressure; or
the second support member is a rigid body that does not deform under 3 bar of water pressure.
17 . The assembly of claim 10 , wherein the acoustic device is a speaker, a receiver, or any combination thereof.
18 . The assembly of claim 10 , wherein the first distance and the second distance are the same.