Microphone Module Drainage Structure for IP69K Water Impact Protection
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Solution Overview
Problem
Microphone modules are prone to damage due to poor water drainage, leading to microphone failure when high-pressure water columns enter, as they lack effective protection against water and dust ingress.
Innovation Solution
A microphone module design featuring a casing with a drainage structure, a waterproof membrane, and a limiting member that supports the membrane to limit deformation, preventing rupture and protecting the microphone from water impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a waterproof membrane is used to protect the microphone from water ingress, then waterproofing performance is improved, but the membrane may rupture under high-pressure water column impact
Solution Approach 1:
A limiting member is pre-installed within the casing to provide structural support to the waterproof membrane before water impact occurs. This limiting member acts as a cushioning element that prevents the membrane from experiencing excessive deformation forces during high-pressure water column impact, thereby preventing rupture while maintaining waterproofing integrity
2Strength
If the waterproof membrane is made more robust to resist water pressure, then resistance to water impact is improved, but voice reception quality deteriorates due to reduced membrane flexibility
Solution Approach 1:
The limiting member serves as an intermediary structural element between the waterproof membrane and the high-pressure water column. It provides the necessary mechanical support to resist water impact forces without requiring the membrane itself to be made more robust, thereby preserving the membrane's flexibility and acoustic transmission properties for optimal voice reception
3Productivity
If drainage channels are added to improve water drainage, then water drainage performance is improved, but the complexity of the device structure increases
Solution Approach 1:
The limiting member within the casing serves multiple functions simultaneously: it provides structural support to the waterproof membrane, acts as a drainage element by creating pathways for water to escape, and maintains the structural integrity of the housing. This multi-functionality improves water drainage performance without significantly increasing overall device complexity
Data Source
AI summary
Disclosed is a microphone module including a casing, a microphone, a drainage structure, a waterproof membrane and a limiting member. The casing has a recess. The microphone is disposed in the casing, and corresponds to the recess. The drainage structure is disposed at the casing and includes a first channel and a second channel communicated to each other. A first sound hole of the first channel is exposed from the casing, and a second sound hole of the second channel corresponds to the microphone. A waterproof membrane is disposed in the recess and located between the microphone and the second sound hole. The limiting member is disposed in the recess and located between the microphone and the waterproof membrane.