An acoustic vent assembly is provided comprising a nonporous acoustic membrane, and a breathable element, the breathable element defining an aperture and an acoustic pathway extends from a first side of the acoustic vent assembly to a second side of the acoustic vent assembly through the aperture and the nonporous acoustic membrane, the breathable element configured to be positioned between the nonporous acoustic membrane and an acoustic transducer when the acoustic vent assembly is installed in an acoustic device comprising an acoustic transducer.
1 . An acoustic vent assembly comprising a nonporous acoustic membrane, and a breathable element, the breathable element defining an aperture and an acoustic pathway extends from a first side of the acoustic vent assembly to a second side of the acoustic vent assembly through the aperture and the nonporous acoustic membrane, the breathable element configured to be positioned between the nonporous acoustic membrane and an acoustic transducer when the acoustic vent assembly is installed in an acoustic device comprising the acoustic transducer,
wherein an airflow through the breathable element is at least 5 mL/min at 7 kPa, wherein the breathable element comprises a breathable material and a strengthening element, wherein the strengthening element has a z-strength from 200 N to 10 MN and the breathable material has a z-strength from 0.3 to 100 N,
the breathable material having an inner surface defining the aperture and an outer surface, the strengthening element being positioned on or directly adjacent to at least a portion of the outer surface of the breathable material such that the strengthening element forms from 20% to 95% of the outer surface of the breathable element.
2 . The acoustic vent assembly of claim 1 , wherein the airflow through the breathable element is from 10 to 500 mL/min at 7 kPa.
3 . The acoustic vent assembly of claim 1 , wherein the strengthening element has the same depth as the breathable material in the breathable element.
4 . The acoustic vent assembly of claim 1 , wherein the strengthening element forms from 50% to 95% of the outer surface of the breathable element.
5 . The acoustic vent assembly of claim 1 , wherein the strengthening element comprises polyethylene terephthalate (PET) or polyimide (PI).
6 . The acoustic vent assembly of claim 1 , wherein the breathable element comprises at least one opening defined by the strengthening element such that the breathable material of the breathable element is exposed through or extends through the at least one opening.
7 . The acoustic vent assembly of claim 1 , wherein the breathable material comprises a polymer selected from polyethylene (PE), polypropylene (PP), Parylene C, Parylene N, polyphenylene sulfide (PPS), polyethylene napthalate (PEN), polyamide, polysulfones (PSU), polyethersulfones (PES), polyacrylonitrile (PAN), polyurethane, polyimide (PI), polydimethylsiloxane (PDMS), polyester, or a fluoropolymer.
8 . The acoustic vent assembly of claim 7 , wherein the breathable material comprises PE, PI or polytetrafluoroethylene (PTFE).
9 . The acoustic vent assembly of claim 1 , wherein the strengthening element is a first strengthening element and further comprising a second strengthening element, wherein the first strengthening element is positioned on a first side of the breathable material and the second strengthening element positioned on an opposed second side of the breathable material.
10 . The acoustic vent assembly of claim 9 , wherein a first opening is defined between the first strengthening element and the second strengthening element on a first side of the breathable element and a second opening is defined between the first strengthening element and the second strengthening element on a second side of the breathable element.
11 . The acoustic vent assembly of claim 1 , wherein the acoustic vent assembly further comprises a vent channel separated from the acoustic pathway by the breathable material of the breathable element that extends from the breathable element through the nonporous acoustic membrane.
12 . An acoustic device comprising a housing defining an acoustic aperture and an enclosed internal volume, an acoustic substrate comprising the acoustic transducer and the acoustic vent assembly according to claim 1 spanning the acoustic aperture, wherein an acoustic volume is defined between the nonpermeable acoustic membrane and the acoustic transducer and the acoustic pathway of the acoustic vent assembly extending from the acoustic transducer to the acoustic aperture through the nonpermeable acoustic membrane, wherein the breathable element of the acoustic vent assembly is configured to allow pressure equilibration between the acoustic volume and the enclosed internal volume of the housing.
13 . The acoustic device of claim 12 , wherein the acoustic transducer is a microphone or speaker.
14 . An acoustic vent assembly comprising a nonporous acoustic membrane, and a breathable element, the breathable element defining an aperture and an acoustic pathway extends from a first side of the acoustic vent assembly to a second side of the acoustic vent assembly through the aperture and the nonporous acoustic membrane, the breathable element configured to be positioned between the nonporous acoustic membrane and an acoustic transducer when the acoustic vent assembly is installed in an acoustic device comprising the acoustic transducer,
wherein an airflow through the breathable element is at least 5 mL/min at 7 kPa, wherein the breathable element comprises a breathable material and a strengthening element, the breathable material having an inner surface defining the aperture and an outer surface, the strengthening element being positioned on or directly adjacent to at least a portion of the outer surface of the breathable material such that the strengthening element surrounds the breathable material,
wherein the acoustic vent assembly further comprises a vent channel separated from the acoustic pathway by the breathable material of the breathable element that extends from the breathable element through the nonporous acoustic membrane.
15 . An acoustic device comprising a housing defining an acoustic aperture and an enclosed internal volume, an acoustic substrate comprising an acoustic transducer and an acoustic vent assembly according to claim 14 spanning the acoustic aperture, wherein an acoustic volume is defined between the nonpermeable acoustic membrane and the acoustic transducer and the acoustic pathway of the acoustic vent assembly extending from the acoustic transducer to the acoustic aperture through the nonpermeable acoustic membrane, wherein the breathable element of the acoustic vent assembly is configured to allow pressure equilibration between the acoustic volume and the enclosed internal volume of the housing.
16 . The acoustic device of claim 15 , wherein the acoustic transducer is a microphone or speaker.