Sound Absorption Material with Organic Frame for Speaker Boxes

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Solution Overview

Problem

Existing sound absorption materials for speaker boxes face challenges such as poor filling capabilities, grain vibration, and reduced acoustic quality due to small grain size, and issues with agglomeration, air permeability, and low sound absorption performance in clump materials.

Innovation Solution

A sound absorption material comprising an organic frame material, a binder, and sound absorption grains with a grain size of 10-100 μm, where the grains are attached via the binder, and the organic frame material has a two- or three-dimensional structure with specific porosity and thickness, combined with zeolite or active carbon particles, to enhance sound absorption and stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If granular sound absorption material with small grain size is used, then sound absorption performance is improved, but filling capability deteriorates and grain vibration occurs

Engineering Contradiction:

Improvesound absorption performanceVSAvoidfilling capability

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The invention uses composite material structure where sound absorption grains (10-100 μm) are attached to an organic frame material surface. This composite structure allows the small grains to maintain high sound absorption performance while the frame material provides structural support that prevents grain vibration and improves filling capability.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The organic frame material has a porous structure with specific porosity (50-90%) that allows sound waves to penetrate while providing a stable substrate for holding the sound absorption grains. The porous structure enhances sound absorption while maintaining structural integrity.

Inventive Principle:

Principle #31Porous materials

2Reliability

If granular sound absorption material with small grain size is used, then sound absorption performance is improved, but acoustic quality deteriorates due to grain vibration

Engineering Contradiction:

Improvesound absorption performanceVSAvoidgrain vibration

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The composite structure of sound absorption grains attached to organic frame material prevents grain vibration by providing a rigid substrate. The grains remain fixed on the frame surface, eliminating the harmful vibration effect while maintaining their sound absorption functionality.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The organic frame material acts as an intermediary between the sound absorption grains and the air. It provides a stable mounting surface that prevents direct grain-to-grain contact and vibration, while still allowing sound waves to interact with the grains for absorption.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Stability of the object's composition

If clump sound absorption material with foam skeleton is used, then structural stability is improved, but air permeability deteriorates and sound absorption performance decreases

Engineering Contradiction:

Improvestructural stabilityVSAvoidsound absorption performance

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The invention creates a composite material where sound absorption grains are attached to the foam skeleton surface rather than using dense clump material. This composite structure maintains the structural stability of the foam frame while the attached grains provide superior sound absorption performance with improved air permeability.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The organic frame material has locally optimized properties with specific porosity (50-90%) and density (10-100 mg/cm³) that balance structural stability and sound absorption. The frame provides stability while its porous structure and attached grains enable effective sound absorption.

Inventive Principle:

Principle #3Local quality

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 material improves low-frequency acoustic performance and stability by increasing acoustic compliance and preventing grain vibration, while being easily adaptable to different back cavity shapes, thus enhancing the overall acoustic quality of speaker boxes.

Implementation Method 1

a sound absorption material for absorbing sound is usually filled in the back cavity of the speaker box

Methodology Applied

Scientific EffectSound absorption: Acoustic Absorption

Implementation Method 2

the organic frame material has a two-dimensional structure and has a thickness in a range of 10-100 μm; the organic frame material is chosen from PE, PP, PVC and PET film

Methodology Applied

Scientific EffectPorous material absorption: Porosity

Implementation Method 3

a binder; a plurality of sound absorption grains attached to the organic frame material via the binder

Methodology Applied

Scientific EffectAdhesion: Adhesive

Data Source

PatentUS11950048B2Sound absorption material, method of making the same and speaker box filled with the same

Publication Date: 2024.04.02 AAC MICROTECH (CHANGZHOU) CO LTD

AI summary

The present invention discloses a sound absorption material including an organic frame material; a binder; a thickener; and a plurality of sound absorption grains attached to the organic frame material via the binder, having a grain size in a range of 10-100 μm. The stability and the sound absorption performance of the sound absorption material have been effectively improved.