Tapered Microphone Protrusion for Sound Diffusion
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Solution Overview
Problem
Existing microphone devices with spherical microphone capsules face issues of sound waves being reflected back into the sound collecting parts from the case, leading to incomplete sound collection and standing wave generation, which hampers the collection of sound with a sense of presence from all 360-degree directions.
Innovation Solution
A microphone device design featuring a cylindrical case with a protrusion part that tapers from the root to the tip, positioned between the pillars supporting the microphone capsule, which diffuses sound waves and reduces reflections, thereby preventing sound waves from entering the sound collecting parts and minimizing standing wave formation, while also serving as a heat sink to enhance cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the case is positioned close to the microphone capsule for compact design, then device size is reduced, but sound waves reflected from the case enter the sound collecting parts causing standing waves and degrading sound collection quality
Solution Approach 1:
The patent introduces a sound absorbing material as an intermediary substance placed between the case and the microphone capsule. This material acts as a mediator that absorbs sound waves before they can reflect off the case and re-enter the sound collecting parts, thereby eliminating the harmful reflection effect while maintaining the compact device structure.
Solution Approach 2:
The patent converts the potentially harmful sound wave reflection into a beneficial effect by using sound absorbing material that transforms the reflected sound energy into heat energy through absorption. This converts the harmful acoustic reflection into a harmless thermal effect, eliminating standing waves while maintaining compact design.
2Object-affected harmful factors
If sound absorbing material is added to prevent reflections, then sound collection quality is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent employs porous sound absorbing material that can be easily integrated into the existing case structure. The porous nature of the material allows it to be molded into simple shapes and attached to the case interior surfaces using conventional manufacturing techniques, thereby achieving effective sound absorption without significantly increasing manufacturing complexity.
Solution Approach 2:
The patent optimizes the parameters of the sound absorbing material such as thickness, density, and porosity to achieve effective sound reflection prevention with minimal material usage. By carefully selecting these parameters, the design achieves effective sound absorption while keeping the added complexity and manufacturing difficulty to a minimum.
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 microphone device effectively collects sound from all 360-degree directions with reduced reflections and standing waves, and improved heat dissipation, allowing for higher performance and expanded frequency range without the need for cooling fans.
Implementation Method 1
the protrusion part that protrudes from a first end face of the housing part in a longitudinal direction so as to expose to the outside, the protrusion part being formed such that a diameter of the protrusion part becomes smaller from a root coupled to the first end face toward a tip
Implementation Method 2
which diffuses sound waves and reduces reflections, thereby preventing sound waves from entering the sound collecting parts and minimizing standing wave formation, while also serving as a heat sink to enhance cooling efficiency
Data Source
AI summary
A case for a microphone device includes; a housing part that has a circuit board therein; and a protrusion part that protrudes from a first end face of the housing part in a longitudinal direction so as to expose to the outside, the protrusion part being formed such that a diameter of the protrusion part becomes smaller from a root coupled to the first end face toward a tip.