COF Porous Acoustic Material for Loudspeaker Low-Frequency Response
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Solution Overview
Problem
Existing porous materials used in loudspeakers, such as zeolite and activated carbon, have high material density and inconsistent properties, making it difficult to achieve consistent acoustic performance and stability.
Innovation Solution
A porous acoustic volume enhancing material composed of covalent organic frameworks (COFs) with specific properties, including a thermal decomposition temperature of 300°C or higher, density of 0.20 g/cc or more, and a particle specific surface area of 200 m²/g, is used, combined with an adhesive to form granular or blocky materials for the loudspeaker's rear cavity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of stationary object
If traditional porous materials (zeolite, activated carbon) are used as volume enhancing materials, then the virtual volume of the loudspeaker cavity is increased, but the material density is high and acoustic performance consistency is difficult to achieve
Solution Approach 1:
The patent employs porous covalent organic framework (COF) materials with controlled pore structures to enhance the virtual volume of the loudspeaker cavity. The COF materials possess well-defined porous structures with tunable pore sizes and high surface areas, enabling effective acoustic volume enhancement while maintaining low density and consistent acoustic performance through controlled synthesis parameters.
Solution Approach 2:
The patent systematically varies synthesis parameters including temperature, pressure, time, and chemical composition to control the pore structure, surface area, and density of COF materials. By optimizing these parameters, the invention achieves consistent acoustic performance and stability while maintaining low material density, resolving the contradiction between volume enhancement and performance consistency.
2Volume of stationary object
If inorganic minerals like zeolite are used, then the virtual volume is enhanced, but the material has high density and limited acoustic performance tuning
Solution Approach 1:
The patent utilizes covalent organic framework (COF) materials, which are organic composite materials with well-defined structures. These COF materials combine lightweight organic components with porous architectures, achieving low density while providing enhanced virtual volume. The organic nature of COFs allows for chemical tunability and lighter weight compared to traditional inorganic minerals like zeolite.
Solution Approach 2:
The invention employs porous COF materials with controlled pore structures that provide high virtual volume enhancement at low material density. The porous architecture of COFs creates effective acoustic volume without adding significant mass, directly addressing the contradiction between volume enhancement and weight reduction.
3Reliability
If porous materials with high surface area are used, then acoustic performance is improved, but manufacturing consistency becomes difficult
Solution Approach 1:
The patent establishes controlled synthesis parameters including temperature, pressure, time, and chemical composition to consistently produce COF materials with desired pore structures and surface areas. By systematically optimizing and controlling these parameters, the invention achieves reproducible acoustic performance and property consistency, resolving the manufacturing challenge of high-surface-area porous materials.
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 COFs material provides excellent low-frequency sound absorption and shock absorption, with improved acoustic performance and stability due to its lower density and controlled pore structure, outperforming traditional materials.
Implementation Method 1
The operating principle relies on the adsorption effect of porous materials to increase the virtual volume constrained by speaker housing
Implementation Method 2
The COFs material provides excellent low-frequency sound absorption and shock absorption
Implementation Method 3
with improved acoustic performance and stability due to its lower density and controlled pore structure
Data Source
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AI summary
The present disclosure provides a porous acoustic volume increasing material and a preparation method therefor, a loudspeaker, and an electronic device. The porous acoustic volume increasing material comprises covalent organic frameworks (COFs), wherein the COFs have a thermal decomposition temperature Td greater than or equal to 300°C, a density greater than or equal to 0.20 g/cc, and a particle specific surface area greater than or equal to 200 m2/g. Acoustic impedance and frequency response analysis tests prove that the porous acoustic volume increasing material comprising the COFs can show excellent low-frequency improvement performance. In particular, the acoustic performance of the porous acoustic volume increasing material comprising the COFs having the specific Td (i.e., Td ≥ 300°C) is more excellent.