MEMS Microphone Package Shielding Ring Joint
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Solution Overview
Problem
MEMS microphones are prone to electromagnetic interference from surrounding electromagnetic waves, which degrades their sound reception quality due to their small size and need for air exposure.
Innovation Solution
A MEMS microphone package with an electromagnetic shielding cover and a shielding ring that covers the joint between the cover and the circuit board, preventing environmental electromagnetic waves from entering the accommodating space, utilizing a metal shielding ring with a different material configuration to enhance shielding performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a MEMS microphone is designed with small size for portability, then it becomes more suitable for mobile devices, but it becomes more susceptible to electromagnetic interference from surrounding electromagnetic waves
Solution Approach 1:
An electromagnetic shielding cover made of conductive material is introduced as an intermediary between the external electromagnetic environment and the MEMS microphone components. The shielding cover forms a Faraday cage structure that intercepts and redirects electromagnetic waves, preventing them from directly interacting with the sensitive microphone elements while allowing the microphone to maintain its compact form factor
Solution Approach 2:
The shielding cover is constructed using composite material structures, combining conductive materials (such as metal meshes or conductive polymers) with insulating materials. This composite approach provides effective electromagnetic shielding while maintaining acoustic transparency and allowing sound waves to pass through to the microphone diaphragm
2Object-affected harmful factors
If an electromagnetic shielding cover is added to protect against interference, then shielding performance is improved, but the device complexity increases
Solution Approach 1:
The shielding cover is designed to perform multiple functions simultaneously: it provides electromagnetic shielding, defines the acoustic port opening, supports the acoustic port cover, and serves as a mounting structure for the MEMS device. By integrating these functions into a single component, the overall package complexity is reduced despite the added shielding capability
Solution Approach 2:
The shielding cover is designed as a nested structure where the acoustic port cover is positioned within or on the shielding cover. This nested arrangement allows both components to work together in a compact configuration, maximizing shielding effectiveness while minimizing the overall package volume and structural 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 solution effectively reduces electromagnetic interference, improving the sound reception quality of MEMS microphones by creating a sealed environment with enhanced shielding performance, protecting the electronic components from external electromagnetic interference.
Implementation Method 1
an electromagnetic shielding cover (1) and a circuit board (2)... a shielding ring (6) covering a joint between the electromagnetic shielding cover (1) and the circuit board (2)... preventing environmental electromagnetic waves from passing through the joint
Data Source
AI summary
A micro-electro-mechanical system (MEMS) microphone package is provided in the present disclosure. The MEMS microphone package includes a circuit board, an electromagnetic shielding cover mounted on the circuit board to define an accommodating space, electronic components received in the accommodating space and electrically connected to the circuit board, and a shielding ring covering a joint between the electromagnetic shielding cover and the circuit board. The shielding ring is configured for preventing electromagnetic waves from entering the accommodating space via the joint between the electromagnetic shielding cover and the circuit board.