Microspeaker Enclosure Porous Block Air Adsorption
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Solution Overview
Problem
Microspeaker enclosures with small sizes and slim shapes face challenges in maintaining sound pressure levels, especially at low frequencies, due to reduced diaphragm area and resonance space, and existing solutions using porous materials can suffer from decreased air adsorption and circulation rates when formed as blocks.
Innovation Solution
A microspeaker enclosure design featuring a block formed of a porous material with 3-nm pores for air adsorption and 6-nm pores for air circulation, combined as a block, and a film attached to one surface to prevent bond penetration, ensuring maintained air adsorption and circulation rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If porous particles are formed as a block to eliminate noise, then noise is reduced, but air circulation to internal particles is blocked and air adsorption performance decreases
Solution Approach 1:
The porous block is segmented into multiple layers with different pore sizes. The lower layer contains larger pores (first pore size) for air circulation, while the upper layer contains smaller pores (second pore size) for air adsorption. This segmentation allows both air circulation and adsorption functions to coexist within the block structure, eliminating noise while maintaining performance.
Solution Approach 2:
Different regions of the porous block are assigned different local qualities - the lower portion has larger pores optimized for air flow, while the upper portion has smaller pores optimized for adsorption. This local differentiation resolves the contradiction by ensuring each region performs its specific function effectively.
2Reliability
If porous particles are arranged to improve low frequency sound pressure level, then acoustic performance is enhanced, but the enclosure size increases
Solution Approach 1:
The invention merges the resonance space function with the porous particle block. The back volume of the enclosure serves dual purposes: as the acoustic resonance space and as the housing for the porous particles. This integration allows the porous particles to be installed without increasing the overall enclosure volume, while still improving low frequency sound pressure level.
Solution Approach 2:
The porous particle block is nested within the existing back volume of the enclosure, utilizing the available space efficiently. The block fits into the resonance space without requiring additional external volume, thereby improving acoustic performance within the constrained enclosure dimensions.
3Strength
If a bond is used to attach the porous block to the enclosure, then the block is securely fixed, but the bond penetrates into the porous block and degrades air adsorption performance
Solution Approach 1:
A film is introduced as an intermediary layer between the porous block and the bond. The film prevents the bond from penetrating into the porous block's pore structure, thereby protecting the air adsorption performance. The film serves as a mediator that allows secure attachment while maintaining the integrity of the porous structure.
4Volume of moving object
If the microspeaker is designed with small size and slim shape for portability, then device portability is improved, but the resonance space area decreases and sound pressure level drops
Solution Approach 1:
Porous particles are installed in the back volume of the miniaturized microspeaker enclosure. These porous particles adsorb air molecules and define a virtual acoustic space, effectively expanding the acoustic volume beyond the physical enclosure dimensions. This allows the microspeaker to maintain small size and slim shape while achieving adequate sound pressure level through the air adsorption effect.
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 effectively maintains air adsorption and circulation rates, preventing degradation of sound pressure levels and ensuring improved acoustic performance without compromising the compact form factor of the microspeaker enclosure.
Implementation Method 1
a porous block installed in the back volume, having 3-nm pores having air adsorption performance
Implementation Method 2
6-nm pores serving as a passage for air circulation
Implementation Method 3
6-nm pores serving as a passage for air circulation
Data Source
AI summary
The present disclosure provides a microspeaker enclosure including a block formed of a porous material. The microspeaker enclosure including a block formed of a porous material includes a microspeaker, an enclosure case in which the microspeaker is mounted, the enclosure case including a back volume communicating with the microspeaker, a porous block installed in the back volume, having 3-nm pores having air adsorption performance and 6-nm pores serving as a passage for air circulation in a predetermined ratio, and including porous particles combined as a block, and a film attached to one surface of the porous block.