Microphone Backplate Irregular Through-Holes Dustproof
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Solution Overview
Problem
Conventional microphones with large circular through holes in the backplate are prone to dust and particle leakage, which can disable the device by allowing alien particles to enter the sound cavity.
Innovation Solution
A microphone design featuring a backplate with a specific through hole pattern and a barrier structure having protruding portions, creating irregular shapes with inwardly concave portions to prevent larger particles from entering, while maintaining a high signal-to-noise ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If large circular through holes are used in the backplate, then the signal-to-noise ratio is improved, but dust and particles can easily enter the sound cavity
Solution Approach 1:
The patent applies asymmetry by changing the through-hole shape from circular to irregular shapes (Y-type, triangular, rectangular, or polygonal with concave portions). These asymmetric shapes with inwardly concave portions prevent particles from passing through while maintaining adequate opening area for acoustic performance, thus resolving the contradiction between signal-to-noise ratio and dustproof capability
Solution Approach 2:
The patent applies local quality by creating specific geometric features (inwardly concave portions) at critical locations of the through-holes. The concave portions act as local barriers that prevent particle passage while the overall hole shape maintains sufficient open area for acoustic signal transmission, thereby simultaneously achieving good dustproof effect and signal-to-noise ratio
2Productivity
If the through hole diameters are made larger, then the acoustic performance is improved, but the dustproof effect deteriorates
Solution Approach 1:
The patent uses asymmetric through-hole shapes with inwardly concave portions that provide sufficient open area for acoustic performance while the concave features create physical barriers that prevent particle passage, thus improving both acoustic performance and dustproof effect simultaneously
Solution Approach 2:
The patent changes the geometric parameters of the through-holes from simple circular shapes to complex irregular shapes with specific concave portion dimensions. By optimizing the shape parameters (concave depth, angle, position) while maintaining adequate total open area, the patent achieves both good acoustic performance and enhanced dustproof capability
Data Source
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AI summary
The present invention discloses a microphone, comprises: a silicon substrate; a diaphragm disposed over the silicon substrate; a backplate disposed over the diaphragm, the backplate having a plurality of through holes formed therein and a barrier structure, and the plurality of through holes being arranged in a through hole pattern on the backplate; the barrier structure having one or more protruding portions extending from at least one part of the through hole wall of the barrier structure, thereby the section shape of at least one through hole being an irregular shape with one or more inwardly concave portion. The microphone provided by the present invention can achieve a better dustproof effect.