Loudspeaker Rear Cavity Filling With ITH Molecular Sieve for Low Frequencies
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Solution Overview
Problem
Existing loudspeakers face challenges in maintaining good sound quality with a reduced rear cavity size, particularly in the low-frequency band, as conventional methods to enhance acoustic compliance are inadequate.
Innovation Solution
Filling the rear cavity of loudspeakers with an ITH molecular sieve, which has a specific Si/M ratio, micropore size, and extra-framework cations, to improve acoustic compliance and low-frequency performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the rear cavity size is reduced, then the device size is decreased, but the low-frequency sound quality deteriorates
Solution Approach 1:
The patent fills the rear cavity with porous materials (activated carbon, zeolite, or silicon dioxide) that have specific pore size ranges (0.5-5 μm). These porous materials increase the acoustic compliance of the air in the rear cavity, allowing the small rear cavity to maintain good low-frequency sound quality by effectively increasing the virtual rear cavity volume while keeping the physical size compact.
Solution Approach 2:
The patent changes the physical parameters of the rear cavity by introducing porous materials with specific pore sizes and filling ratios (5-50% by volume). This transforms the acoustic characteristics of the rear cavity, increasing acoustic compliance and allowing the system to achieve good low-frequency performance despite the reduced physical volume.
2Reliability
If porous materials are added to increase acoustic compliance, then low-frequency performance is improved, but the device complexity increases
Solution Approach 1:
The patent utilizes commercially available porous materials (activated carbon, zeolite, silicon dioxide) that can be directly filled into the rear cavity without complex processing. The materials are introduced in granular or powdered form with simple filling procedures, avoiding complex manufacturing steps while achieving the desired acoustic compliance improvement.
Solution Approach 2:
The patent optimizes the filling ratio parameter (5-50% by volume) to balance acoustic performance and manufacturing simplicity. By controlling only the filling quantity rather than requiring precise positioning or complex structural integration, the patent achieves improved acoustic compliance while maintaining simple manufacturing processes.
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 ITH molecular sieve significantly enhances low-frequency sound quality by increasing acoustic compliance, resulting in improved sound pressure and resonant frequency performance.
Implementation Method 1
The ITH molecular sieve has uniform micropores with a micropore size of 0.4 Å to 0.55 Å... rapid adsorption, desorption and diffusion of nitrogen in the channel
Data Source
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Figure 3
AI summary
The present disclosure discloses a loudspeaker improved by an ITH molecular sieve, and an electronic device. A rear cavity of the speaker is filled with the ITH molecular sieve. The ITH molecular sieve includes a framework and extra-framework cations. The framework contains silicon dioxide and an oxide of a non-silicon element M. A Si/M molar ratio is at least 80 or more, and exempalrily 100 or more. The ITH molecular sieve has uniform micropores with a micropore size of 0.4 Å to 0.55 Å and a micropore volume of 0.10 cm3/g to 0.25 cm3/g. The inclusion of the ITH molecular sieve in the rear cavity of the loudspeaker increases acoustic compliance of air in the rear chamber, and thereby improving performance of the speaker in a low-frequency band.