Rotatable Waterproof Plug for Mobile Microphone Acoustic Sealing
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Solution Overview
Problem
Conventional protective cases for mobile terminals often cause echo or low sound issues due to the use of waterproof and breathable films over the microphone, which fail to effectively manage sound transmission.
Innovation Solution
A protective case design featuring a rotatable waterproof plug that switches between sealing the microphone through hole and communicating it with the outside, depending on the device's call state, to prevent echo and low sound issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a waterproof and breathable film is attached to the microphone through hole, then the microphone is waterproof, but echo or low sound problems occur
Solution Approach 1:
The patent applies the dynamics principle by making the waterproof plug rotatable and switchable between two states: sealed and open. The plug can rotate to seal the microphone through hole during non-call periods to prevent water ingress, and rotate to an open position during call periods to allow sound transmission. This dynamic switching mechanism resolves the contradiction by making the waterproofing function adaptive rather than static, eliminating echo and low sound issues while maintaining waterproof protection.
2Reliability
If the microphone through hole is sealed to prevent water ingress, then waterproofing is achieved, but sound transmission is blocked
Solution Approach 1:
The waterproof plug is designed to be rotatable, allowing it to dynamically switch between sealing the microphone through hole and allowing sound transmission. During non-call states, the plug seals the hole for waterproofing; during call states, the plug rotates to open the hole for sound reception. This dynamic mechanism resolves the contradiction between waterproofing and sound reception.
Solution Approach 2:
The patent changes the state parameter of the microphone through hole from permanently sealed to dynamically openable. By introducing a rotatable waterproof plug that can change its position between sealed and open states, the system allows the hole's permeability parameter to be adjusted based on operational needs, resolving the contradiction between waterproofing and sound transmission.
Data Source
AI summary
A protective case for a mobile terminal includes a lower shell, an upper cover detachably connected to the lower shell, and a waterproof plug. The upper cover and the lower shell are enclosed to form an accommodating cavity. A microphone through hole and a groove are defined on a sidewall of the upper cover. The microphone through hole and the groove are spaced apart. The microphone through hole is communicated with the accommodating cavity. The waterproof plug is rotatably connected to the upper cover. The waterproof plug is assembled in the microphone through hole or the groove by rotating the waterproof plug, and the waterproof plug is separated from the microphone through hole or the groove by rotating the waterproof plug. The protective case solves a technical problem that a conventional protective case has a microphone waterproof function is likely to cause echo or low sound.