Porous PTFE Speaker Enclosure for Pressure Equalization
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Solution Overview
Problem
Conventional sealed audio speaker designs face challenges in maintaining sound quality due to parasitic leaks, which cause pressure build-up and distortion, especially in small portable devices, and are costly to manufacture while not being fully liquid-tight or gas-tight.
Innovation Solution
A sealed audio speaker design incorporating a gas permeable element, such as a porous hydrophobic PTFE material with specific pore sizes, is used to allow gas exchange while preventing liquid ingress, maintaining acoustic pressure at desired frequencies and relieving slowly changing pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealed speaker enclosure is used to prevent liquid ingress, then liquid tightness is improved, but gas pressure build-up occurs due to parasitic leaks causing sound quality degradation
Solution Approach 1:
The patent applies porous PTFE (polytetrafluoroethylene) material as a gas permeable element within the sealed enclosure. This porous material allows slow passage of gas molecules to equalize pressure while maintaining the sealed appearance and liquid tightness. The porous structure provides controlled permeability that prevents pressure build-up without creating audible leaks, resolving the contradiction between being sealed and allowing pressure equalization.
Solution Approach 2:
The invention uses composite construction by integrating a gas permeable layer (porous PTFE) within the sealed enclosure structure. This composite approach combines the liquid-blocking properties of the sealed enclosure with the gas-permeable characteristics of the porous material, enabling simultaneous achievement of liquid tightness and pressure equalization that neither material could provide alone.
2Ease of manufacture
If conventional seals are used to create a sealed enclosure, then manufacturing cost is reduced, but pressure equalization is insufficient leading to diaphragm position alteration and distortion
Solution Approach 1:
The patent incorporates porous PTFE material as a gas permeable element within the sealed enclosure. This porous material allows slow passage of gas molecules to equalize pressure while maintaining the sealed appearance and liquid tightness. The porous structure provides controlled permeability that prevents pressure build-up without creating audible leaks, resolving the contradiction between being sealed and allowing pressure equalization.
Solution Approach 2:
The invention uses composite construction by integrating a gas permeable layer (porous PTFE) within the sealed enclosure structure. This composite approach combines the liquid-blocking properties of the sealed enclosure with the gas-permeable characteristics of the porous material, enabling simultaneous achievement of liquid tightness and pressure equalization that neither material could provide alone.
3Reliability
If a fully sealed design is implemented to prevent liquid ingress, then liquid tightness is improved, but manufacturing complexity and cost increase significantly
Solution Approach 1:
The patent incorporates porous PTFE material as a gas permeable element within the sealed enclosure. This porous material allows slow passage of gas molecules to equalize pressure while maintaining the sealed appearance and liquid tightness. The porous structure provides controlled permeability that prevents pressure build-up without creating audible leaks, resolving the contradiction between being sealed and allowing pressure equalization.
Solution Approach 2:
The invention uses composite construction by integrating a gas permeable layer (porous PTFE) within the sealed enclosure structure. This composite approach combines the liquid-blocking properties of the sealed enclosure with the gas-permeable characteristics of the porous material, enabling simultaneous achievement of liquid tightness and pressure equalization that neither material could provide alone.
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
This design ensures a liquid-tight and gas-permeable speaker that maintains sound quality with reduced distortion and power inefficiencies, achieving a balance between manufacturing ease and high-quality audio output.
Implementation Method 1
a gas permeable element, such as a porous hydrophobic PTFE material with specific pore sizes, is used to allow gas exchange while preventing liquid ingress
Implementation Method 2
a gas permeable element, such as a porous hydrophobic PTFE material with specific pore sizes, is used to allow gas exchange
Data Source
AI summary
The present disclosure generally provides an apparatus and method of forming a pressure equalizing audio speaker that can be easily manufactured and provides a high quality audio output. One or more of the embodiments of the disclosure provided herein include a sealed enclosure that has at least one liquid impermeable and gas permeable region that allows the flow of a gas between an interior region and an exterior region, while preventing or substantially inhibiting the movement of a liquid from the exterior region into the internal region. In general, the liquid impermeable and gas permeable regions are configured to allow slowly changing gas pressures registered between the internal region and exterior region to be relieved, while allowing rapidly changing gas pressures generated by the diaphragm at audible frequencies to function at a desired level during use.