Acoustic Vent Assembly With Nonporous Membrane Pressure Equalization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vent assemblies for electronic devices with acoustic transducers face challenges in maintaining acoustic performance while providing pressure regulation and protection from contaminants, with porous membranes often compromising sound transmission.
Innovation Solution
A nonporous acoustic membrane combined with a breathable element featuring a strengthening element that enhances z-strength, ensuring airflow and preventing delamination, is used to create a vent assembly that maintains acoustic integrity and resistance to contaminants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a porous membrane is used to allow pressure equalisation, then pressure regulation is improved, but acoustic performance deteriorates
Solution Approach 1:
The vent assembly is segmented into distinct functional layers: a nonporous acoustic membrane for sound transmission and pressure equalisation, and a separate breathable element with specific airflow characteristics. This segmentation allows each component to optimise its specific function without compromising the other, resolving the contradiction between pressure regulation and acoustic performance.
Solution Approach 2:
The vent assembly uses a composite structure combining a nonporous acoustic membrane material with a breathable element material. This composite approach enables the assembly to simultaneously achieve pressure equalisation through the membrane and controlled airflow through the breathable element, while maintaining acoustic integrity.
2Reliability
If a breathable material is used to allow airflow, then pressure equalisation is improved, but structural strength deteriorates
Solution Approach 1:
The breathable element is constructed as a composite of the breathable material and strengthening element. The breathable material provides the necessary airflow and pressure equalisation, while the strengthening element compensates for the lower z-strength of the breathable material, achieving both pressure equalisation and structural integrity.
Solution Approach 2:
The strengthening element is positioned specifically on the outer surface of the breathable material where structural support is most needed. This local reinforcement provides z-strength enhancement precisely where required to prevent delamination, while preserving the breathable material's airflow properties in the regions where breathability is critical.
3Object-generated harmful factors
If the breathable element has low z-strength, then acoustic performance is improved, but delamination resistance deteriorates
Solution Approach 1:
The breathable element combines a breathable material with a strengthening element to create a composite structure. This composite design maintains the acoustic performance benefits of the breathable material while the strengthening element provides the necessary delamination resistance, resolving the contradiction between acoustic performance and structural stability.
Solution Approach 2:
The strengthening element is incorporated into the breathable element design beforehand to prevent delamination issues before they occur. This proactive reinforcement ensures that the breathable element maintains its structural integrity and bonding to the acoustic membrane under operational conditions, while preserving the desired acoustic performance characteristics.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The vent assembly achieves improved acoustic performance and pressure regulation while minimizing the ingress of particulates and liquids, with a stable airflow range of 5-500 mL/min at 7 kPa, reducing the risk of delamination and maintaining sound transmission.
Implementation Method 1
Vent assemblies that incorporate a porous membrane may allow gas to pass through the porous membrane to thereby allow pressure equalisation through the membrane
Implementation Method 2
the membrane of the vent or vent assembly is tailored to prevent ingress of particulates and liquids whilst trying to minimise the impact of the membrane on the acoustic properties of the vent assembly
Data Source
AI summary
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.