Waterproof Membrane Assembly for Microphone Acoustic Sealing
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Solution Overview
Problem
Existing electronic devices face challenges in maintaining acoustic sealing and waterproofing of microphones, leading to issues such as sound leakage or damage to the microphone and waterproof membrane assembly during assembly, due to manufacturing tolerances and uneven compressive forces.
Innovation Solution
A waterproof membrane assembly is designed with a distributed compressive force to accommodate manufacturing tolerances, comprising a first sub-assembly on the printed circuit board and a second sub-assembly on the plate, with a reinforcement member, to ensure proper assembly and prevent damage while maintaining acoustic sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-layer waterproof membrane assembly is used, then the structure is simple, but it cannot accommodate manufacturing tolerances and leads to sound leakage or damage during assembly
Solution Approach 1:
The waterproof membrane assembly is divided into a first sub-assembly (including first adhesive member and first elastic member) and a second sub-assembly (including second adhesive member, second elastic member, and membrane). This segmentation allows each sub-assembly to independently accommodate manufacturing tolerances while maintaining acoustic sealing, resolving the contradiction between structural simplicity and sealing reliability.
2Ease of manufacture
If uniform compressive force is applied to the waterproof membrane assembly, then assembly is simple, but manufacturing tolerances cause uneven force distribution leading to damage
Solution Approach 1:
Elastic members are incorporated into both sub-assemblies to provide beforehand cushioning. These elastic members absorb and distribute compressive forces uniformly, preventing stress concentration that could cause damage during assembly, thus resolving the contradiction between assembly simplicity and damage resistance.
3Reliability
If the waterproof membrane assembly is tightly fixed to ensure sealing, then acoustic sealing is improved, but the microphone and membrane assembly are prone to damage during assembly
Solution Approach 1:
The assembly structure changes the compression parameter distribution through its two-sub-assembly design. By distributing the sealing function across multiple components with elastic members, the system achieves reliable acoustic sealing while reducing the compressive force on any single component, thereby preventing damage during assembly.
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 solution effectively prevents sound leakage and damage to the microphone, ensuring consistent performance by distributing compressive forces uniformly and accommodating manufacturing tolerances.
Implementation Method 1
a first sub-assembly disposed on a second surface of the printed circuit board and including a first adhesive member and a first elastic member; a second sub-assembly disposed on a seating surface formed on the second surface of the plate and including a second adhesive member, a second elastic member, and a membrane
Data Source
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AI summary
This electronic device may include: a plate including an inner surface exposed to an inner space of the electronic device; a circuit board facing the inner surface of the plate, the circuit board including a first surface and a second surface opposite to the first surface, and the second surface facing the inner surface of the plate; an electronic component arranged on the first surface of the circuit board; a sealing member arranged on the second surface of the circuit board; and a waterproof member arranged on the inner surface of the plate and configured to be assembled with the sealing member. The sealing member assembled with the waterproof member may be in contact with the waterproof member.