Loudspeaker Wire Damper Fabric With Unequal Wave Crest Widths
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Solution Overview
Problem
Conventional loudspeaker wire dampers with circular center holes shrink to elliptical shapes due to differences in elongation ability and elastic resilience between warp and weft yarns, leading to gaps that cause the voice coil to shake.
Innovation Solution
Manufacture a fabric material with a wire damper featuring an elliptical center hole and wave crests with unequal widths, where the pressing and forming center portions are elliptical, and the wave crests have asymmetrical widths to ensure a tight fit around the voice coil.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If circular center hole is used in wire damper manufacturing, then the mold design is simple, but the center hole shrinks to elliptical shape causing voice coil to shake
Solution Approach 1:
The patent applies asymmetry by designing the mold center hole as elliptical rather than circular, with the ellipse's major axis aligned with the warp yarn direction. This asymmetric design compensates for the differential shrinkage of warp and weft yarns during fabric formation, ensuring that the final center hole maintains a circular shape after shrinkage, thereby preventing voice coil shaking while maintaining mold design simplicity.
2Device complexity
If circular grooves and protrusions are used for wave portion, then the mold structure is simple, but the wave crests shrink to non-circular shape reducing fitting precision
Solution Approach 1:
The patent applies asymmetry to the wave portion mold design by making the grooves and protrusions elliptical rather than circular. The ellipse's major axis is aligned with the warp yarn direction, which compensates for the differential shrinkage of warp and weft yarns. This ensures that the wave crests maintain their intended circular shape after fabric shrinkage, improving manufacturing precision without significantly increasing mold structure 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
The improved center hole shape allows the wire damper to maintain the voice coil in the correct position, preventing shaking by ensuring a snug fit within the magnet core.
Implementation Method 1
drying the base material to form a solid resin layer on the base material
Implementation Method 2
forming a center hole of a main body of a wire damper of a loudspeaker on the base material by thermoforming
Data Source
AI summary
A method for manufacturing a fabric material including wire damper of loudspeaker having improved center hole shape by wave crests with unequal widths, including: weaving warp and weft yarns into a base material, and disposing wire assemblies on the base material; impregnating the base material in a resin solution; drying the base material; and thermoforming a wire damper on the base material, thereby obtaining a fabric material including wire damper with a center hole being elliptical, and a width between first and second sides is smaller than a width between third and fourth sides of the innermost wave crest of the wave portion. Accordingly, a wire damper having circular center hole can be manufactured, such that the inner side of the center hole can fit the voice coil tightly and maintain it at a correct position in the gap of the magnet core without shaking.