Hollow Sound-Absorbing Microspheres for Speaker Frequency Reduction
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Solution Overview
Problem
Existing sound-absorbing microspheres in speakers have limited effective surface area, leading to poor frequency reduction performance, which is inadequate for enhancing low-frequency sound effects in portable devices.
Innovation Solution
A sound-absorbing microsphere with a hollow structure composed of molecular sieves and adhesives, featuring depressions on its surface, providing a larger effective surface area for gas absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If an ordinary spherical sound-absorbing microsphere is used, then the structure is simple and easy to manufacture, but the effective surface area is limited and frequency reduction performance is poor
Solution Approach 1:
The spherical body is segmented by forming hollow structures (depressions) on its surface, dividing the continuous surface into multiple regions with increased total surface area while maintaining the overall spherical shape for ease of manufacture
Solution Approach 2:
The hollow structures create a porous-like surface topology on the microsphere, increasing the effective surface area for gas absorption without requiring truly porous materials, thus maintaining manufacturing simplicity while improving frequency reduction performance
2Reliability
If the cavity volume is increased to improve low-frequency effect, then the resonance frequency decreases, but the device size increases which conflicts with portable device constraints
Solution Approach 1:
The molecular sieve material with hollow structures provides high surface area for gas absorption within a compact volume, enabling effective frequency reduction and low-frequency enhancement without requiring a large cavity, thus satisfying both acoustic performance and size constraints
Solution Approach 2:
The microsphere combines molecular sieve material with hollow structures to create a composite structure that maximizes gas absorption capability within a small volume, achieving both low-frequency effect and compact size
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 microsphere achieves better frequency reduction effects by increasing the surface area for gas absorption, thereby improving sound performance in speakers.
Implementation Method 1
a molecular sieve, as a porous material, is capable of constantly adsorbing and desorbing air inside the cavity
Implementation Method 2
remove ice from the microsphere by sublimation to obtain the sound-absorbing microsphere
Data Source
AI summary
The disclosed is a sound-absorbing microsphere, method and a speaker. The sound-absorbing microsphere is composed of molecular sieves and adhesives. The sound-absorbing microsphere includes a spherical body and one or more hollow structures formed by depressions on a surface of the spherical body. A maximum depth or width of the hollow structure is 2% to 50% of a diameter of the spherical body. One or more hollow structures connected to the outside are fabricated on the sound-absorbing microsphere, such that the microsphere has a larger effective surface area capable of absorbing more gas molecules, thereby achieving better sound-absorbing effects. By filling the sound-absorbing microsphere into the speaker, better frequency reduction effects are achieved, and the sound performance is significantly improved. The sound-absorbing microsphere according to the present disclosure has a larger effective surface area, such that the effects of frequency reduction are bettered, and the sound performance is improved.