Microphone Module Annular Protrusion Water Pressure Relief
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Solution Overview
Problem
Existing waterproof microphone modules are costly and prone to deformation or breakage under high water pressure, which compromises their acoustic and waterproof performance due to the deformation of intermediate layers such as waterproof films.
Innovation Solution
A microphone module design featuring a housing with a sound receiving hole, a pressing plate, and an intermediate layer, where an annular protrusion divides the cavity into two compartments connected by a passage, and a water drain hole in the pressing plate to relieve pressure and allow water drainage, maintaining performance under high-pressure conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a waterproof intermediate layer is used to prevent water from entering the sound receiving hole, then waterproof ability is improved, but under high water pressure the intermediate layer deforms or breaks causing acoustic performance to deteriorate
Solution Approach 1:
The accommodating cavity is divided into a first cavity and a second cavity by the annular protrusion, with the intermediate layer positioned in the first cavity. This segmentation allows the intermediate layer to be isolated from direct high-pressure water impact while still providing waterproof protection, preventing deformation and breakage that would compromise acoustic performance.
Solution Approach 2:
The annular protrusion acts as an intermediary structure between the intermediate layer and the high-pressure water environment. It provides mechanical support and protection to the intermediate layer, allowing it to maintain its waterproof function without being directly exposed to damaging pressure vibrations that would cause deformation.
2Reliability
If a waterproof intermediate layer is used to prevent water from entering the sound receiving hole, then waterproof ability is improved, but the cost increases due to additional components
Solution Approach 1:
The annular protrusion is integrated directly into the housing structure, combining the functions of structural support, cavity division, and intermediate layer positioning into a single component. This merging eliminates the need for separate support structures or complex assembly steps, reducing manufacturing cost while maintaining waterproof ability.
Solution Approach 2:
The annular protrusion serves multiple functions simultaneously: it provides structural support for the intermediate layer, divides the accommodating cavity into first and second cavities, and creates the passage for water drainage. This multi-functionality reduces the number of additional components needed, thereby lowering manufacturing cost while maintaining effective waterproof protection.
3Reliability
If a complex water outlet groove is used to prevent water from entering the sound receiving hole, then waterproof ability is improved, but device complexity increases
Solution Approach 1:
The water outlet function is achieved by dividing the accommodating cavity into first and second cavities with a passage connecting them, rather than using a complex water outlet groove. This segmentation provides a simple, clear water drainage path that maintains waterproof ability while significantly reducing structural complexity.
Solution Approach 2:
The water outlet function is extracted from the housing structure and implemented through the simple passage in the annular protrusion, rather than incorporating a complex integrated water outlet groove. This extraction simplifies the overall device structure while maintaining effective water prevention capability.
4Reliability
If the intermediate layer is exposed to high-pressure water, then waterproof protection is provided, but the vibration amplitude becomes large causing deformation or breakage
Solution Approach 1:
The accommodating cavity is segmented into a first cavity containing the intermediate layer and a second cavity exposed to water pressure, connected by a passage. This segmentation shields the intermediate layer from direct high-pressure water contact, reducing vibration amplitude and preventing deformation or breakage while maintaining waterproof protection.
Solution Approach 2:
The annular protrusion provides beforehand cushioning and mechanical support to the intermediate layer, positioning it in the first cavity away from direct water pressure. This preparatory protection reduces the impact of pressure vibrations before they can cause deformation or breakage, ensuring intermediate layer integrity while maintaining waterproof function.
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 design reduces vibration amplitude of the intermediate layer, prevents damage from high-pressure water, and ensures effective water drainage, thereby maintaining acoustic and waterproof performance while reducing manufacturing costs.
Implementation Method 1
the first cavity and the second cavity are communicated with each other through a passage in the side wall of the annular protrusion
Implementation Method 2
the annular protrusion divides the accommodating cavity into a first cavity formed inside the annular protrusion and a second cavity formed outside the annular protrusion
Data Source
AI summary
The present invention discloses a microphone module. The module comprises: a housing having a sound receiving hole; a pressing plate fixedly combined with the housing, an accommodating cavity being formed between the inner side surface of the pressing plate and the outer side surface of the housing, and the pressing plate comprising sound transmitting hole corresponding to the sound receiving hole; and an intermediate layer covering the sound receiving hole, provided on the outer or inner side surface of the housing, and corresponding to the sound receiving hole. The housing further comprises an annular protrusion having a passage, extending outwards from the outer side surface of the housing, and surrounding the sound receiving hole. According to the microphone module provided in the present invention, by combining the sound transmitting hole with the annular protrusion having the passage, the vibration amplitude of the intermediate layer remains small even when the microphone module is subjected to high-pressure water impact, such that deformation and breaking of the intermediate layer are avoided. Therefore, the influence on the acoustic performance and waterproof performance of the microphone module is reduced.