Closed Cell Foam Microphone Body for Environmental Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional microphones using open-cell foam materials and thin membranes for sound transmission are prone to mechanical and physical compromise, leading to potential sound transmission loss and environmental exposure issues.
Innovation Solution
A microphone design employing a closed-cell foam body between the transducer and the sound reception area, eliminating the need for an acoustic PTFE membrane while maintaining effective sound transmission and environmental protection, with a closed-cell foam material that exhibits minimal sound insertion loss in the 300 to 3400 Hz frequency band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If open-cell foam material and thin membrane are used for sound transmission media, then mechanical protection and environmental resistance are provided, but sound transmission loss increases and mechanical reliability decreases
Solution Approach 1:
The patent removes the thin membrane component from the traditional microphone structure. By extracting this weak element, the invention eliminates the source of mechanical failures and sound transmission losses while maintaining environmental protection through the closed-cell foam alone
Solution Approach 2:
The invention changes the fundamental parameter of the foam material from open-cell to closed-cell structure. This parameter change transforms the material properties to provide both mechanical protection and acoustic transparency, resolving the contradiction between durability and sound transmission
2Object-affected harmful factors
If thin membrane is used to protect transducer from water and particulates, then environmental protection is improved, but mechanical strength and reliability deteriorate
Solution Approach 1:
The patent changes the cell structure parameter of the foam from open to closed, creating a material that is inherently resistant to water and particulate intrusion while maintaining high mechanical strength. The closed cells act as natural barriers without requiring additional membrane layers
Solution Approach 2:
The closed-cell foam material performs multiple functions simultaneously: it provides mechanical protection, environmental resistance to water and particulates, and maintains acoustic transparency. This single material replaces the traditional multi-component system of open-cell foam plus membrane
3Object-affected harmful factors
If multiple components (open-cell foam and membrane) are used for protection, then environmental resistance is improved, but device complexity increases
Solution Approach 1:
The patent merges the protective functions previously distributed across multiple components (open-cell foam and membrane) into a single closed-cell foam material. This consolidation simplifies the structure while maintaining or improving environmental resistance
Solution Approach 2:
The closed-cell foam serves as a universal protective element that simultaneously provides mechanical protection, water resistance, and particulate filtration, eliminating the need for separate membrane components and reducing overall device complexity
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 closed-cell foam effectively protects the transducer from environmental elements without significant sound transmission loss, achieving good voice transmission and wind buffeting mitigation with fewer parts, and passing environmental tests.
Implementation Method 1
a closed cell foam body positioned between the transducer and an area for receiving ambient sound
Implementation Method 2
The foam provides mechanical and wind buffeting protection
Data Source
Figure 1~2
Figure 3~4
AI summary
A microphone 10 that comprises a transducer 12 and a closed cell foam body 18, 20 positioned between the transducer 12 and an opening 25 fashioned for receiving ambient sound. The microphone 10 is protected from external factors without exhibiting substantial sound transmission loss while using few parts. Good voice transmission, wind buffeting mitigation, and environmental protection can be achieved with a single material.