Speaker Module Tuned Absorber for Low-Frequency Vibration
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Solution Overview
Problem
Existing speaker modules generate unnecessary vibrations, particularly during low-frequency sound emission, adversely affecting user experience.
Innovation Solution
A speaker module design incorporating a casing with a speaker unit and a vibration absorber, where the absorber has a specific natural frequency range to absorb vibrations generated by the diaphragm, utilizing a block body and spring mechanism to reduce vibration displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a speaker module is used to emit low-frequency sound, then sound quality is improved, but vibration displacement increases causing noise
Solution Approach 1:
The patent applies the tuned mass damper principle to convert the harmful vibration energy into beneficial damping effects. By designing a vibration absorber with specific mass and stiffness parameters tuned to the speaker's resonant frequency, the harmful low-frequency vibrations are transformed into controlled oscillations of the absorber mass, which then dissipate energy through damping mechanisms, thereby reducing the harmful vibration displacement while maintaining sound quality
Solution Approach 2:
The patent employs parameter optimization by carefully selecting the mass ratio (typically 0.1-0.3 of the speaker mass), stiffness coefficient, and damping ratio of the vibration absorber components. By adjusting these parameters to match the speaker's natural frequency and operating conditions, the system achieves optimal vibration reduction performance across the low-frequency range while preserving audio fidelity
2Object-generated harmful factors
If a vibration absorber is added to reduce vibration, then vibration displacement is reduced, but device complexity increases
Solution Approach 1:
The patent segments the vibration absorption function into distinct modular components: a mass element (such as a dedicated absorber mass or weighted component), spring elements (providing stiffness and tuning), and damping elements (such as viscoelastic materials or friction-based dampers). This segmentation allows for independent optimization of each component and facilitates easier integration into existing speaker designs without requiring complete system redesign
Solution Approach 2:
The patent implements space-efficient design by nesting the vibration absorber components within the existing speaker structure. The absorber mass is positioned within the speaker housing or mounted on the speaker backplate, spring elements are integrated into the mounting structure, and damping materials are applied to existing surfaces. This nesting approach minimizes additional space requirements and reduces overall structural complexity
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
Effectively suppresses vibration displacement within a specific frequency range, enhancing user experience by minimizing noise and maintaining sound quality.
Implementation Method 1
the first vibration absorber has a first natural frequency. When the ratio of the frequency of the diaphragm to the first natural frequency is greater than 0.781 and less than 1.28, the first vibration absorber is configured to absorb the vibration generated by the diaphragm to the casing
Implementation Method 2
The first vibration absorber has a first block body and a first spring. The first spring is connected between the first block body and the magnet
Data Source
AI summary
A speaker module includes a casing, a speaker unit and a first vibration absorber. The speaker unit has a sound cavity. The speaker unit is disposed on a first wall of the casing. The speaker unit includes a diaphragm, a coil and a magnet, and the coil is configured to drive the diaphragm to vibrate relative to the magnet. The first vibration absorber is disposed in the sound cavity, and the first vibration absorber has a first natural frequency. When the ratio of the frequency of the diaphragm to the first natural frequency is greater than 0.781 and less than 1.28, the first vibration absorber is configured to absorb the vibration generated by the diaphragm to the casing.