Boundary Microphone Conductive Mesh Shielding
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Solution Overview
Problem
Conventional boundary microphones fail to provide effective shielding against high-frequency electromagnetic waves, particularly from mobile phones using frequencies like 2 GHz, due to irregularities in the contact surfaces between the base and cover, leading to noise interference.
Innovation Solution
The microphone design incorporates a first and second metallic part made of mesh materials that overlap with the base and cover, creating a comprehensive enclosure around internal components to block electromagnetic waves, ensuring no gaps and enhancing shielding efficacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the base and cover are directly connected without additional shielding structures, then the device complexity is reduced, but the shielding effect against high-frequency electromagnetic waves deteriorates due to gaps caused by surface irregularities
Solution Approach 1:
A gasket made of electrically conductive and elastic material is introduced as an intermediary component between the base and cover. This gasket fills the gaps caused by surface irregularities and maintains continuous electrical contact, providing effective shielding against high-frequency electromagnetic waves without requiring complex additional structures
Solution Approach 2:
The solution changes the physical parameters of the connection interface by introducing a material with both elasticity and electrical conductivity. The elasticity allows the gasket to conform to surface irregularities, while the electrical conductivity ensures continuous shielding, resolving the contradiction between simple structure and effective electromagnetic wave blocking
2Object-affected harmful factors
If the base and cover are joined without gaps to shield internal components, then the shielding effect improves, but the manufacturing precision requirement increases due to surface irregularities in die-casting and punching processes
Solution Approach 1:
The gasket functions as a flexible thin film that can deform to accommodate surface irregularities in both the die-casted base and punched cover. This flexibility allows the gasket to maintain continuous contact and provide effective shielding without requiring high manufacturing precision of the base and cover components
Solution Approach 2:
The gasket serves as a mediator that compensates for manufacturing tolerances and surface irregularities. By placing this compliant intermediate layer between the rigid base and cover, the system achieves continuous electrical contact and effective shielding without demanding tight manufacturing precision
3Ease of manufacture
If conventional direct connection of base and cover is used, then the ease of manufacture is improved, but the reliability of electromagnetic shielding deteriorates when mobile phones with short wavelength radio waves are used nearby
Solution Approach 1:
The conductive gasket is introduced as a simple intermediary component that maintains continuous electrical contact between base and cover, providing reliable shielding against short wavelength electromagnetic waves from mobile phones. This addition maintains ease of manufacture while significantly improving shielding reliability
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 configuration effectively prevents electromagnetic wave penetration and noise interference, even when a mobile phone using high-frequency waves is nearby, significantly improving the signal-to-noise ratio.
Implementation Method 1
the base, the cover, the first metallic part, and the second metallic part are alternately overlapped at their peripheral portions... at least one of the first metallic part and the second metallic part is made of a metallic mesh in order to introduce sound waves to the microphone unit
Data Source
AI summary
A boundary microphone, comprising: a base made of a metal; a cover made of a metal having a plurality of holes for introducing sound waves; and internal components including a microphone unit that is disposed in an internal space enclosed by the base and the cover; a first metallic part disposed on one side of the upper and lower sides of the internal components; and a second metallic part, which is disposed on other side of the upper and lower sides of the internal components and which encloses the internal components along with the first metallic part from all directions, are provided, wherein the base, the cover, the first metallic part, and the second metallic part are alternately overlapped at their peripheral portions, and wherein at least one of the first metallic part and the second metallic part is made of a metallic mesh.