MEL Molecular Sieves for Speaker Acoustic Compliance
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Solution Overview
Problem
Speakers with small rear cavities face challenges in achieving good tone quality due to reduced low-frequency response, as existing methods to enhance acoustic compliance, such as replacing air with gas or using porous materials, are limited in effectiveness.
Innovation Solution
Incorporating MEL structured molecular sieves with a silicon dioxide framework and specific molar ratios into the rear cavity of speakers to increase acoustic compliance by adsorbing and desorbing air, thereby improving low-frequency performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the rear cavity of the speaker is reduced to achieve small size, then the speaker size is reduced, but the low-frequency response is obviously reduced and tone quality becomes worse
Solution Approach 1:
The patent uses porous materials (molecular sieves with pore volumes of 0.25-0.45 cm³/g and specific surface areas of 300-600 m²/g) filled in the rear cavity to increase the virtual cavity volume. The porous structure provides adsorption and desorption of air molecules, effectively increasing the acoustic compliance without occupying physical space, thus maintaining small speaker size while improving low-frequency response
Solution Approach 2:
The patent changes the physical and chemical parameters of the rear cavity by introducing molecular sieves with specific pore volumes (0.25-0.45 cm³/g) and surface areas (300-600 m²/g). These parameter changes create a virtual expansion of the cavity volume, allowing the small speaker to achieve better low-frequency performance through altered acoustic properties rather than physical expansion
2Reliability
If porous materials such as active carbon, zeolite, silica are filled in the rear cavity to increase virtual cavity volume, then acoustic compliance is improved, but the available space for other components is reduced
Solution Approach 1:
The patent employs molecular sieves with optimized pore volumes (0.25-0.45 cm³/g) that provide high acoustic compliance per unit volume. The porous structure allows air molecules to be adsorbed and desorbed within the material matrix, creating a virtual expansion of the acoustic cavity without physically occupying additional space, thus improving acoustic compliance while preserving component placement space
Solution Approach 2:
The patent uses composite material structures combining molecular sieves with specific framework types (such as MEL, MFI, FER structures) and controlled pore characteristics. This composite approach achieves high acoustic compliance through the synergistic effect of the molecular sieve framework and pore structure, maximizing acoustic performance within limited space constraints
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 use of MEL structured molecular sieves significantly enhances low-frequency response and acoustic compliance, allowing for improved tone quality even in small speaker designs.
Implementation Method 1
the pores adsorb or desorb air molecules under the action of sound pressure
Data Source
AI summary
The present disclosure provides a sound absorbing material, a manufacturing method thereof and a speaker using the sound absorbing material. The speaker comprises a shell with a receiving space, a sound production unit disposed in the shell, and a rear cavity encircled by the sound production unit and the shell. The rear cavity is filled with a sound absorbing material. The sound absorbing material comprises MEL structured molecular sieves. The framework of the MEL structured molecular sieves comprises silicon dioxide.