Loudspeaker Coil Lead Wire Using Carbon Nanotube Structures
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Solution Overview
Problem
Electrodynamic loudspeakers suffer from fatigue fractures in their coil lead wires, reducing their lifespan due to the poor strength of metal wires used in their construction.
Innovation Solution
The use of carbon nanotube wire structures, either non-twisted or twisted, replaces traditional metal wires in the coil lead wire, enhancing mechanical strength and conductivity by joining carbon nanotubes end-to-end with van der Waals attractive forces, and optionally coating them with a conductive structure to improve electrical conductivity and prevent oxidation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional metal wires are used in the coil lead wire, then the manufacturing process is simple and cost-effective, but the wire suffers from fatigue fracture due to poor strength, reducing loudspeaker lifespan
Solution Approach 1:
The patent applies composite materials by combining carbon nanotubes with metal wires to create a hybrid coil lead wire structure. The carbon nanotubes provide enhanced strength and fatigue resistance, while the metal wire maintains electrical conductivity. This composite approach resolves the contradiction by significantly improving strength without requiring complete structural redesign, thus limiting complexity increase while achieving the desired mechanical performance.
Solution Approach 2:
The patent changes the material parameters of the coil lead wire by incorporating carbon nanotubes, which have superior tensile strength and fatigue resistance compared to traditional metal wires. This parameter change allows the wire to withstand repeated bending and deformation during loudspeaker operation, resolving the strength issue while maintaining a similar wire-based structure to minimize complexity increase.
2Reliability
If carbon nanotube wire structures are used to replace metal wires, then bend resistance and conductivity are significantly increased, but the manufacturing process becomes more complex
Solution Approach 1:
The patent applies segmentation by dividing the coil lead wire into distinct functional segments: carbon nanotube segments for strength and conductivity enhancement, and metal wire segments for electrical conduction. This segmentation allows each material to perform its optimal function while simplifying the manufacturing process, as the segments can be assembled through known techniques like coating or braiding, rather than requiring complete process redesign.
Solution Approach 2:
The patent uses an intermediary approach by employing a coating or bonding mechanism that connects carbon nanotubes to the metal wire core. This intermediary layer facilitates the integration of carbon nanotubes into the existing wire manufacturing process, allowing manufacturers to incorporate the high-reliability carbon nanotube structure without completely abandoning established metal wire manufacturing techniques.
3Duration of action of stationary object
If metal wires are used in the coil lead wire, then the structure is simple, but fatigue fracture occurs during deformation, making the loudspeaker inoperative
Solution Approach 1:
The patent uses composite materials combining carbon nanotubes and metal wires to create a coil lead wire that resists fatigue fracture. The carbon nanotubes provide exceptional fatigue resistance due to their molecular structure, allowing the loudspeaker to operate for extended periods without wire failure. This composite structure extends lifespan while maintaining reasonable structural complexity through established composite manufacturing methods.
Solution Approach 2:
The patent applies beforehand cushioning by incorporating carbon nanotubes into the coil lead wire structure in advance, providing preemptive protection against fatigue fracture. This preventive measure ensures that the wire can withstand repeated deformation cycles during loudspeaker operation, extending the device lifespan before any failure could occur, while adding only moderate 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
The carbon nanotube wire structures significantly increase the bend resistance and conductivity of the coil lead wire, leading to improved loudspeaker performance and extended lifespan by preventing fatigue fractures and maintaining sound quality.
Implementation Method 1
joining carbon nanotubes end-to-end with van der Waals attractive forces
Implementation Method 2
The voice coil produces a changing magnetic field around the voice coil. The changing magnetic field interacts with a magnetic field produced by a permanent magnet to produce reciprocal forces on the voice coil
Implementation Method 3
optionally coating them with a conductive structure to improve electrical conductivity and prevent oxidation
Data Source
AI summary
A loudspeaker includes a magnetic system defining a magnetic gap, a vibrating system, and a supporting system. The vibrating system includes a diaphragm, a voice coil bobbin disposed in the magnetic gap, a coil lead wire having a first end and a second end, and a voice coil wound around the voice coil bobbin and electrically connected to the first end. The supporting system includes a frame fixed to the magnetic system and receiving the vibrating system. The frame has a terminal electrically connected to the second end of the coil lead wire. The diaphragm is received in the frame. The voice lead wire includes at least one carbon nanotube wire structure. The carbon nanotube wire structure includes a plurality of carbon nanotubes.