MEMS Microphone Backplate Edge Pattern Holes for Stress Reduction
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Solution Overview
Problem
Conventional MEMS microphones and acoustic transducers face challenges in achieving robustness to withstand mechanical shock without compromising sensitivity, as the backplate structure often breaks when stress exceeds the yield point of materials used, due to the trade-off between robustness, flexibility, and manufacturing constraints.
Innovation Solution
The implementation of edge pattern holes with a length-to-width ratio greater than one and configured in a radial arrangement, such as oval, egg, ellipse, droplet, or capsule shapes, in the backplate structure to distribute stress more uniformly and reduce concentration, thereby enhancing the robustness of MEMS membranes and backplates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the backplate structure is made more robust to withstand mechanical shock, then reliability improves, but manufacturing complexity and design constraints worsen
Solution Approach 1:
The backplate is segmented into multiple regions with different hole patterns: a first region with a first hole pattern and a second region with a second hole pattern. This segmentation allows each region to be optimized for its specific function while maintaining overall structural integrity and robustness.
Solution Approach 2:
Different regions of the backplate are assigned different hole patterns tailored to local requirements. The first region has a hole pattern optimized for acoustic performance, while the second region has a hole pattern optimized for mechanical strength and stress distribution, achieving local quality optimization throughout the structure.
2Measurement precision
If the backplate is designed for high sensitivity, then measurement precision improves, but robustness deteriorates due to material yield limits
Solution Approach 1:
The backplate is divided into functional regions with different hole patterns that balance sensitivity and robustness requirements, allowing the structure to achieve both high measurement precision and adequate mechanical strength within material yield limits.
Solution Approach 2:
The hole patterns are designed with specific parameter ranges (hole diameter, spacing, distribution) that optimize the balance between acoustic sensitivity and mechanical robustness, ensuring the backplate can detect subtle acoustic signals while withstanding mechanical shocks without exceeding material yield points.
Data Source
AI summary
Robust microelectromechanical systems (MEMS) sensors and related manufacturing techniques are described. Disclosed MEMS membranes and backplate structures facilitate manufacturing robust MEMS microphones. Exemplary MEMS membranes and backplate structures can comprise edge pattern holes having a length to width ratio greater than one and/or configured in a radial arrangement. Disclosed implementations can facilitate providing robust MEMS membranes and backplate structures, having edge pattern holes with a profile resembling at least one of an oval, an egg, an ellipse, a droplet, a cone, or a capsule or similar suitable configurations according to disclosed embodiments.