Loudspeaker Vented Enclosure Membrane Pressure Equalization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Vented loudspeaker arrangements face challenges with pressure differentials due to environmental conditions, leading to reduced sound quality, and the addition of vent holes can introduce moisture and dirt ingress, further degrading sound quality.
Innovation Solution
A hollow enclosure with a loudspeaker and a vent hole covered by a gas-permeable, liquid-impermeable membrane that allows slow pressure equalization, preventing water and dirt ingress while maintaining acoustic sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vent hole is added to the enclosure, then pressure differential problems are resolved, but moisture and dirt ingress occurs
Solution Approach 1:
The patent applies a porous membrane material in the vent hole that allows gas molecules to pass through via diffusion while blocking liquid droplets and particulate matter. The pore size is specifically designed to permit water vapor and air molecules while preventing liquid water and dirt particles from entering the enclosure, thus resolving the contradiction between pressure equalization and contamination prevention.
Solution Approach 2:
The vent assembly uses a composite structure combining a rigid frame with a flexible porous membrane. This composite design provides both structural integrity for mounting and the selective permeability function, allowing the system to maintain enclosure pressure equilibrium while filtering out harmful contaminants.
2Reliability
If a vent hole is added to the enclosure, then pressure differential problems are resolved, but sound quality may be reduced
Solution Approach 1:
The porous membrane allows acoustic frequencies to pass through while blocking lower frequency pressure waves that could affect sound quality. The membrane's physical properties create a high-pass filter effect, permitting sound transmission while maintaining pressure equilibrium, thus preventing degradation of sound quality.
Solution Approach 2:
The membrane acts as an intermediary element between the interior and exterior environments, mediating the interaction between pressure equalization needs and acoustic performance requirements. It selectively transmits acoustic energy while blocking mass flow of air that could compromise sound quality.
3Reliability
If the membrane allows fast pressure equalization, then pressure differential is quickly removed, but acoustic sealing is compromised
Solution Approach 1:
The porous membrane's controlled pore structure creates resistance to bulk air flow while permitting molecular diffusion. This results in slow pressure equalization that maintains acoustic sealing, as the membrane's flow resistance prevents rapid pressure changes that would compromise acoustic integrity.
Solution Approach 2:
The membrane's physical parameters (pore size, porosity, thickness) are specifically selected to control the pressure equalization rate. By adjusting these parameters, the system achieves optimal balance between preventing pressure differentials and maintaining acoustic sealing, ensuring slow enough equalization to preserve sound quality.
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 solution enables continuous pressure venting and prevents moisture and dirt ingress, ensuring sound quality by allowing gradual pressure equalization without compromising acoustic sealing.
Implementation Method 1
said panel comprises at least one gas-permeable and liquid-impermeable membrane. The membrane allows flow of gas through the membrane at a limited rate
Implementation Method 2
The membrane allows flow of gas through the membrane at a limited rate which is such that pressure equalization between the hollow interior and the ambience of the enclosure requires at least 1 second
Data Source
Figure 1~2
Figure 3~4
AI summary
A loudspeaker arrangement is disclosed that comprises a hollow box-like enclosure having rigid walls in which a loudspeaker opening and a vent hole are formed; a loudspeaker which is arranged in or at the loudspeaker opening and sealingly secured to the enclosure; and a protective panel which is arranged in or at the vent hole and sealingly secured to the enclosure, said panel comprises at least one gas-permeable and liquid-impermeable membrane.