Microphone Waterproofing via Semispherical Frame and Diaphragm
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Solution Overview
Problem
Existing microphones disposed outside vehicle cabins lack effective waterproofing and environmental resistance, leading to potential damage from water, rubbish, or dust ingress.
Innovation Solution
A microphone design featuring a diaphragm, a frame with a semispherical, parabolic, or conical internal shape, and a waterproof mechanism such as resin coating or O-ring seals to prevent water ingress, along with a sound pressure input surface configuration that enhances sound collection and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the acoustic transducer is exposed to the outside for sound collection, then sound sensitivity is improved, but environmental resistance deteriorates due to water and dust ingress
Solution Approach 1:
The patent employs a diaphragm as a flexible thin film that serves dual purposes: it allows sound waves to pass through to the acoustic transducer while simultaneously acting as a protective barrier against water and dust ingress. The diaphragm is positioned between the external environment and the acoustic transducer, enabling the transducer to remain protected while maintaining sound collection capability.
2Reliability
If waterproof mechanisms are added to protect the acoustic transducer, then environmental resistance is improved, but device complexity increases
Solution Approach 1:
The patent merges the protective function with existing structural components. The diaphragm is integrated into the microphone assembly as both a sound collection element and a waterproof barrier. Additionally, the frame structure is designed to provide both mechanical support and sealing functions, eliminating the need for separate complex waterproofing systems.
Solution Approach 2:
The diaphragm serves multiple functions simultaneously: it acts as a sound wave transmitter, a protective barrier against environmental contaminants, and a structural component of the microphone assembly. This multi-functionality reduces the need for additional dedicated waterproofing components, thereby limiting the increase in device complexity.
3Reliability
If the frame is sealed to prevent water ingress, then environmental resistance is improved, but sound pressure transmission may be affected
Solution Approach 1:
The diaphragm is designed as a porous or permeable structure that allows sound waves to pass through while blocking water and dust particles. The porous nature of the diaphragm enables acoustic transmission by allowing air molecules to pass through the material, while the physical structure prevents larger water droplets and particulate matter from reaching the acoustic transducer.
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 improves environmental resistance and prevents acoustic transducer breakdown, allowing for reliable operation in outdoor vehicle installations while maintaining sound sensitivity and durability.
Implementation Method 1
an acoustic transducer that converts sound pressure into an electric signal
Data Source
AI summary
A microphone structure has a diaphragm; a frame of which an inside is processed in a shape of a semispherical surface, a parabolic surface, or a conical surface; an acoustic transducer that converts sound pressure into an electric signal; and a wire that transmits the electric signal from the acoustic transducer to outside. A sound pressure input surface of the acoustic transducer is disposed on a bottom surface portion of the semispherical surface, the parabolic surface, or the conical surface inside the frame. The diaphragm and the frame, and the frame and the wire include waterproof mechanisms preventing ingress of water.