Microspeaker Enclosure Porous Material Anti-Noise Structure
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Solution Overview
Problem
Microspeakers with small size and slim shape designs face challenges in increasing low-frequency sound pressure levels (SPL) and reducing total harmonic distortion (THD) due to reduced diaphragm area and resonance space volume, leading to noise issues from collisions between porous materials and enclosure components during sound generation.
Innovation Solution
Incorporating an anti-noise structure with elastic foam and adhesive members within the microspeaker enclosure to prevent collisions between porous materials and other components, and using air-permeable pouches or elastic foams to minimize vibrations and noise, while maintaining the effectiveness of porous materials in enhancing low-frequency SPL and reducing THD.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If porous materials are filled in the resonance space to increase low-frequency SPL, then low-frequency sound pressure increases and low-frequency THD decreases, but noise is generated due to collision between porous materials and enclosure components
Solution Approach 1:
An air-permeable pouch is introduced as an intermediary layer between the porous materials and the enclosure components. The pouch contains the porous materials while preventing direct contact and collision between them and the enclosure, thus eliminating noise generation while preserving the acoustic benefits of the porous materials in the resonance space
2Quantity of substance
If porous materials are filled in the resonance space to enhance low-frequency SPL, then low-frequency sound pressure increases, but the porous materials vibrate and collide with each other and enclosure components causing noise
Solution Approach 1:
The air-permeable pouch serves as a mediator that isolates the porous materials from direct mechanical interaction with enclosure components. The pouch allows air permeability for acoustic function while providing mechanical isolation that prevents vibration and collision of the porous materials, thereby eliminating harmful vibrations
Solution Approach 2:
The air-permeable pouch is constructed as a flexible shell that encapsulates the porous materials. This flexible membrane structure allows the pouch to accommodate sound wave movements while maintaining physical separation between the porous materials and enclosure components, preventing direct contact and vibration
3Quantity of substance
If porous materials are filled in the resonance space, then low-frequency SPL increases, but porous materials may be introduced into the microspeaker through vent holes
Solution Approach 1:
The air-permeable pouch acts as a protective intermediary barrier between the porous materials and the microspeaker vent holes. The pouch contains the porous materials and prevents them from being drawn into the microspeaker through the vent holes during operation, while still allowing air permeability for proper acoustic function
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 proposed solution effectively reduces noise caused by material vibrations, enhances low-frequency sound pressure, and minimizes harmonic distortion by preventing collisions and ensuring proper placement of porous materials within the microspeaker enclosure, thereby improving sound quality.
Implementation Method 1
the porous materials adsorb air molecules to define a virtual acoustic space, which results in increased low-frequency SPL and decreased low-frequency THD
Implementation Method 2
an anti-noise structure which prevents at least one of a collision between the porous materials, a collision between the porous materials and the enclosure, a collision between the porous materials and the microspeaker, and introduction of the porous materials into the microspeaker
Data Source
AI summary
The present invention discloses a microspeaker enclosure with porous materials, including a microspeaker, an enclosure with the microspeaker therein, the enclosure defining a resonance space and having an upper casing and a lower casing, porous materials filled in the resonance space of the enclosure, and an anti-noise structure which prevents at least one of a collision between the porous materials, a collision between the porous materials and the enclosure, a collision between the porous materials and the microspeaker, and introduction of the porous materials into the microspeaker.