MEMS Microphone Sound Test Device with Conical Insert
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Solution Overview
Problem
There is a need to improve sound testing and calibration of MEMS microphones used in mobile devices to ensure high-quality performance, as existing methods may not adequately address the specific requirements of these miniaturized components.
Innovation Solution
A sound test device comprising a sound chamber, socket unit, and sound generator unit with a speaker and reference microphone, along with a hollow conical insert and ground ring contact, is designed to accurately test MEMS microphones by generating and measuring sound waves, while preventing standing waves and ensuring an airtight seal for precise calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sound test device is designed for MEMS microphones, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The DUT is nested within the sound chamber formed by the speaker membrane, microphone membrane, and opening. The socket unit with contact elements is integrated into the sound test device structure, allowing electrical connections to be made within the acoustic environment. This nesting approach enables precise sound testing while consolidating multiple functions into a compact integrated device.
Solution Approach 2:
The sound test device combines multiple functions: the speaker generates sound waves for testing, the reference microphone measures the sound, the socket unit provides electrical connections, and the opening receives the DUT. This multi-functional integration improves measurement precision while managing device complexity through functional consolidation.
2Measurement precision
If the sound chamber is made airtight for precise calibration, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The airtight seal is pre-configured through the specific arrangement of the speaker membrane, microphone membrane, and opening that form the sound chamber. The opening is designed to receive the DUT in a predetermined manner, allowing the seal to be automatically established when the DUT is inserted, thus maintaining calibration accuracy while simplifying operation.
3Ease of operation
If the opening receives the DUT opening directly for testing, then ease of operation is improved, but manufacturing precision requirements increase
Solution Approach 1:
The opening is positioned opposite the microphone membrane at a specific distance to create an equipotential acoustic environment. This geometric arrangement ensures that sound waves propagate uniformly from the speaker through the DUT to the reference microphone, reducing sensitivity to minor alignment variations and lowering manufacturing precision requirements while maintaining ease of operation.
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 accurate sound testing and calibration of MEMS microphones, suppressing unwanted standing waves and ensuring precise electrical and acoustic isolation, thereby enhancing the quality and reliability of these components in mobile devices.
Implementation Method 1
a sound generator unit (120), wherein the sound generator unit includes a speaker (128)
Implementation Method 2
a reference microphone (124) comprising a microphone membrane (324)
Implementation Method 3
an insert (122) having a hollow conical opening (122c) tapering towards the opening (122o) of the sound generator unit (120) and limiting the sound chamber (130)
Data Source
AI summary
A sound test device for testing a DUT in particular a MEMS microphone, comprises a sound chamber a socket unit and a sound generator unit, wherein the sound generator unit includes a speaker comprising a speaker membrane, an opening, and a reference microphone comprising a microphone membrane wherein the opening is adapted to receive a DUT opening of the DUT and wherein the microphone membrane and the opening are arranged to opposing each other, and the socket unit includes the at least one contact element being adapted to contact to a contact terminal of the DUT, and wherein the sound chamber is limited by the speaker membrane, the microphone membrane, and the opening.