Speaker Damper Planar Elastic Metal Wire Stiffness
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Solution Overview
Problem
Traditional speaker dampers made of materials like CONEX and blended fabrics have high mechanical stiffness, leading to high resonance frequencies, poor bass sensitivity, and short service life due to material degradation in high-temperature and humid environments, resulting in degraded acoustic performance and user experience.
Innovation Solution
A sound-producing device with a damper featuring a planar elastic part formed by bending a metal wire into a line-like shape, with mechanical stiffness between 0.2 N/mm and 2 N/mm, and a resonance frequency between 50 Hz and 300 Hz, which reduces total harmonic distortion and enhances durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional materials like CONEX and blended fabrics are used for the damper, then the damper has sufficient strength, but the mechanical stiffness Kms becomes too high leading to high resonance frequency F0 and poor bass sensitivity
Solution Approach 1:
The patent changes the material parameter from chemical fiber to metal wire, and changes the structural parameter from corrugated to planar elastic with bending tracks. This combination achieves mechanical stiffness Kms of 0.2-2 N/mm, resolving the contradiction between having sufficient strength and maintaining low mechanical stiffness for good bass sensitivity.
Solution Approach 2:
The damper is formed by winding metal wire into a line-like shape to create a composite structure with bending tracks. This composite construction provides both the necessary strength and the desired low mechanical stiffness characteristics that traditional single-material dampers cannot achieve.
2Ease of manufacture
If traditional chemical fiber materials are used for the damper, then the damper can be manufactured easily, but the damper degrades in high-temperature and humid environments leading to short service life
Solution Approach 1:
The patent changes the material parameter from chemical fiber to metal wire, which fundamentally improves resistance to high-temperature and humid environments. The metal wire maintains its mechanical properties under these conditions, dramatically extending the service life of the speaker while the winding formation process remains manufacturable.
3Device complexity
If the damper is made with traditional materials and structure, then the manufacturing process is simple, but the total harmonic distortion THD is high degrading acoustic performance
Solution Approach 1:
The patent changes the structural parameter from corrugated to planar elastic with bending tracks, and changes the material to metal wire. This achieves mechanical stiffness Kms of 0.2-2 N/mm and resonance frequency F0 of 50-300 Hz, which directly reduces total harmonic distortion THD to less than 10% in the frequency range of 100 Hz to 300 Hz, significantly improving acoustic performance.
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 solution achieves improved acoustic performance by lowering resonance frequency, reducing total harmonic distortion, and extending the service life of the sound-producing device while maintaining mechanical stiffness and fatigue resistance.
Implementation Method 1
the planar elastic part is formed by the first connecting part being bent and extending toward the second connecting part
Data Source
AI summary
Disclosed is a sound-producing device, including: a voice coil configured to be able to be input an electrical signal; and a damper including a first connecting part, a planar elastic part and a second connecting part. The first connecting part is configured to be connected to the voice coil; the second connecting part is configured to be fixed to the sound-producing device; the planar elastic part is formed by the first connecting part being bent and extending toward the second connecting part; the damper has a mechanical stiffness Kms of 0.2 N/mm to 2 N/mm; the sound-producing device has a resonance frequency F0 of 50 Hz to 300 Hz; the sound-producing device has a total harmonic distortion THD of less than 10% in a frequency range of 100 Hz to 300 Hz.