Side-Port MEMS Microphone Package for Flexible Acoustic Path Layout
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Solution Overview
Problem
Existing piezoelectric microelectromechanical system (PMM) microphones face challenges in design flexibility due to limited placement options, particularly when integrating an acoustic port, which affects performance and assembly complexity, especially in devices requiring compact form factors.
Innovation Solution
The development of a side-port PMM package that includes a microelectromechanical system die with a membrane support substrate and an acoustic port defined by an aperture, allowing for flexible placement and improved acoustic path design, including a cap die and trench features to enhance performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional top-port or bottom-port PMM design is used, then the acoustic port location is fixed, but the placement flexibility and design adaptability are limited
Solution Approach 1:
The patent introduces a side-port configuration that adds a lateral dimension to the acoustic port location, moving away from the conventional top-port or bottom-port arrangements. This dimensional change enables the PMM to be integrated into diverse device layouts where the acoustic port can access sound from the side, significantly improving placement flexibility and adaptability to different form factors without complicating the acoustic path design
2Object-affected harmful factors
If the acoustic port is located far from the PMM, then noise from speakers and other acoustic sources is minimized, but the gasket structure and mechanical design become more complex
Solution Approach 1:
The patent segments the acoustic path into distinct functional zones: a noise isolation zone created by strategic positioning of the acoustic port and gasket, and a sound capture zone near the PMM membrane. The gasket is designed as a separate modular component that can be independently optimized for both noise blocking and acoustic transmission, simplifying the overall mechanical design while effectively minimizing noise interference from speakers and other sources
3Adaptability or versatility
If a long, narrow acoustic path is used, then the port hole can be positioned flexibly, but peaks in the audio band are created causing a 'tinny' sound
Solution Approach 1:
The patent optimizes the acoustic path parameters by controlling its length, width, and cross-sectional area to maintain specific acoustic impedance characteristics. The side-port configuration allows for a shorter, wider acoustic path compared to traditional designs, which prevents the formation of resonant peaks in the audio band. By adjusting these dimensional parameters, the design achieves both flexible port positioning and a flat frequency response across the target audio range
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 side-port design enhances placement flexibility, reduces assembly complexity, and improves acoustic path efficiency, leading to better frequency response and reduced noise interference.
Implementation Method 1
piezoelectric microelectromechanical system microphone package... a microelectromechanical system die disposed on the microphone substrate and including a microphone membrane... to convert sound pressure (e.g., voice) into an electrical signal
Data Source
AI summary
A side-port piezoelectric microelectromechanical system microphone package includes a microelectromechanical system die disposed on the microphone substrate and including a microphone membrane and a membrane support substrate, the microphone membrane being disposed on a wall of a membrane support substrate, and an acoustic port defined by an aperture passing through a portion of the wall of the membrane support substrate.