Zeolite Microspheres with Inflatable Balls for Speaker Acoustics
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Solution Overview
Problem
Existing speaker designs face challenges in achieving low-frequency sound performance due to the limited size of the speaker cavity, which restricts the movement of the vibration diaphragm and distorts sound waves, while also requiring materials that can effectively reduce resonance frequency without increasing the cavity size.
Innovation Solution
A gas adsorbent comprising microspheres formed by agglomeration of zeolite and adhesive, with inflatable balls that expand and release gas to create a porous structure, enhancing gas adsorption and reducing resonance frequency, is used to fill the speaker cavity, improving acoustic compliance and low-frequency performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the speaker cavity size is reduced to save space, then the volume of the speaker is reduced, but the resonance frequency increases and low-frequency sound performance deteriorates
Solution Approach 1:
The patent uses molecular sieve microspheres with porous structures as filling material in the speaker cavity. The porous structure provides large specific surface area and adsorption capacity, enabling the material to adsorb significant amounts of gas (air molecules) within a small volume. This resolves the contradiction by achieving high gas adsorption capacity without increasing cavity volume, thereby maintaining low resonance frequency in compact speakers.
Solution Approach 2:
The patent employs composite filling material consisting of molecular sieve microspheres combined with other materials to optimize both adsorption performance and acoustic characteristics. This composite approach enhances the gas adsorption capacity per unit volume while maintaining the mechanical and acoustic properties needed for effective resonance frequency reduction in limited space.
2Quantity of substance
If molecular sieve microspheres with more pore structures are developed to increase gas adsorption, then the adsorption capacity increases, but the manufacturing complexity increases
Solution Approach 1:
The patent optimizes the pore size distribution, porosity ratio, and surface area parameters of the molecular sieve microspheres to achieve maximum gas adsorption capacity. By carefully controlling these physical parameters during synthesis, the material achieves high adsorption performance without requiring overly complex structures, thus balancing performance with manufacturability.
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 gas adsorbent effectively increases the internal volume of the speaker cavity, reducing resonance frequency and enhancing low-frequency sound quality by increasing the adsorption capacity, thereby improving the overall acoustic performance of the speaker.
Implementation Method 1
the inflatable ball includes: a thermoplastic housing body comprising high molecular polymers; the housing body softens when heated, and expands in volume when subjected to pressure
Implementation Method 2
inflatable ball further includes an inner filler which is a liquid alkane, and the inner filler vaporizes when heated, thereby increasing the internal pressure of the inflatable ball
Implementation Method 3
molecular sieve can continuously adsorb and desorb the air in the cavity when the cavity vibrates, thereby indirectly increasing the volume of the cavity
Data Source
AI summary
The present invention provides a gas adsorbent comprising a number of microspheres formed by agglomeration of zeolite and adhesive. Among the plurality of microspheres, at least some of the microspheres have a porous structure and contain inflatable balls inside. In the present invention, the high molecular polymer expansion ball is added into the zeolite microsphere, and more pore structures are created in the zeolite microsphere by utilizing its characteristics of expansion, solidification and rupture at different temperatures. Thus, the adsorption capacity of the zeolite microsphere to air is increased to achieve a better frequency reduction effect.