Waterproof Microphone Anterior Chamber Moisture Discharge
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Solution Overview
Problem
Conventional waterproof microphones suffer from sound pressure attenuation due to moisture accumulation in the anterior chamber, which disrupts sound collection, especially in humid or high-pressure environments.
Innovation Solution
A waterproof microphone design featuring a cylinder-shaped case with an anterior chamber, first and second diaphragms, and an electrode plate, where the first gap between the diaphragms and the second gap between the diaphragm and electrode plate are linked, with a discharge aperture on the anterior wall to expel moisture and maintain equal pressure across chambers, preventing diaphragm contact and allowing effective sound collection across wider frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the aperture is not overlapped with the inner face of the anterior chamber, then moisture discharge is hindered, but sound collection is improved
Solution Approach 1:
The interior space is segmented into multiple functional zones: the anterior chamber for moisture discharge, the first gap sealed by the first diaphragm to prevent moisture entry, and the second gap for sound pressure transmission. This segmentation allows moisture to be discharged while preventing it from reaching the sound-sensitive areas.
Solution Approach 2:
The first diaphragm acts as an intermediary barrier that seals the first gap between the anterior chamber and the sound collection area. It prevents moisture from the anterior chamber from entering the sound-sensitive regions while allowing pressure equalization.
2Object-affected harmful factors
If the first gap is sealed from the anterior chamber, then moisture entry is prevented, but pressure equalization is hindered
Solution Approach 1:
The sealing is applied selectively to the first gap while leaving the second gap and posterior chamber open to pressure changes. This segmentation allows the sealed first gap to prevent moisture entry while the unsealed second gap maintains pressure equalization with the external environment.
Solution Approach 2:
Different regions have different sealing properties: the first gap is sealed to prevent moisture, while the second gap and posterior chamber remain open for pressure equalization. This local differentiation of sealing quality resolves the contradiction between moisture prevention and pressure balance.
3Reliability
If the second diaphragm maintains constant gap with electrode plate, then sound collection is optimized, but diaphragm contact or excessive gap formation occurs under pressure changes
Solution Approach 1:
The second gap and posterior chamber are kept open to pressure changes, allowing the pressure on both sides of the second diaphragm to remain equal. This pressure equipotentiality prevents the diaphragm from deflecting excessively or contacting the electrode plate, maintaining stable sound collection characteristics.
4Object-affected harmful factors
If discharge aperture is overlapped with inner face of anterior chamber, then moisture discharge is improved, but sound pressure loss occurs
Solution Approach 1:
The discharge aperture is positioned in the anterior chamber which is segmented off from the sound collection area by the first diaphragm. This segmentation allows the aperture to discharge moisture effectively while preventing sound pressure loss, as the sound-sensitive regions are sealed from the discharge opening.
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
This design ensures efficient sound collection without moisture interference and air pressure influence, maintaining sound quality in various environments, including high-humidity and high-pressure conditions.
Implementation Method 1
the first gap is sealed from the anterior chamber by the first diaphragm
Implementation Method 2
moisture such as rain water, if entering the anterior chamber, is smoothly discharged out of the case from the discharge aperture along the inner face of the anterior chamber
Implementation Method 3
the first gap, the second gap and the posterior chamber are linked, and therefore when pressure in the anterior chamber changes, the pressures in the first gap, the second gap and the posterior chamber become equal in compliance with the change
Implementation Method 4
allows the second diaphragm to normally vibrate in response to voice so as to achieve sufficient sound collection over wider frequency bands
Implementation Method 5
the throttle hole does not substantially transmit dynamic pressure fluctuation in the first gap to the second gap but substantially transmits static pressure fluctuation in the first gap to the second gap
Data Source
AI summary
An anterior wall of a case has a central aperture and two discharge apertures extending from the central aperture. There is an anterior chamber inside the anterior wall. Moisture such as rain water, even if entering the anterior chamber, is smoothly discharged out of the case from the discharge apertures along an inner face of the anterior chamber. As a result, it becomes possible to prevent the moisture from remaining and attaching to a first diaphragm in the anterior chamber and to prevent degradation of sound pressure collected by the first diaphragm through the central aperture and the discharge apertures.