Thermoacoustic Device Array With Suspended Carbon Nanotube Generators
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Solution Overview
Problem
Thermoacoustic devices using carbon nanotube films are prone to damage from external forces due to their small thickness and large area, limiting their durability and sound wave generation efficiency.
Innovation Solution
A thermoacoustic device array is designed with a substrate having recesses and cutting lines to suspend carbon nanotube sound wave generators, providing insulation and protection, and using an insulating layer to reduce heat absorption and increase structural integrity, allowing for independent operation of multiple units with reduced driven voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carbon nanotube film is used as sound wave generator, then sound wave generation efficiency is improved, but structural strength deteriorates due to small thickness and large area
Solution Approach 1:
The patent divides the large-area carbon nanotube film into multiple independent sound wave generator units, each suspended over recesses in the substrate. This segmentation maintains the large surface area needed for efficient sound wave generation while reducing the susceptibility of each individual unit to mechanical damage, as failures are isolated to specific units rather than affecting the entire film.
Solution Approach 2:
The patent introduces a substrate with recesses as an intermediary structure between the carbon nanotube film and the external environment. The recesses provide mechanical support and suspension for the carbon nanotube film, protecting it from direct contact with damaging external forces while allowing the film to maintain its functional surface area for heat conversion and sound wave generation.
2Reliability
If carbon nanotube film with large area is used, then sound pressure level is improved, but reliability deteriorates due to increased vulnerability to external forces
Solution Approach 1:
By segmenting the large-area film into multiple independent units suspended over recesses, the patent ensures that external forces affect only specific localized areas rather than the entire structure. This segmentation strategy maintains overall reliability while preserving the large surface area needed for high sound pressure level generation.
Solution Approach 2:
The substrate recesses serve as a pre-designed protective structure that cushions and distributes mechanical stresses before they can damage the carbon nanotube film. This beforehand cushioning mechanism protects the fragile film from external forces while allowing it to maintain its functional integrity for reliable operation.
3Strength
If insulating layer is added to protect carbon nanotube structure, then structural integrity is improved, but heat absorption increases
Solution Approach 1:
The patent applies insulating material selectively in specific locations (such as the substrate recesses and support structures) rather than uniformly across the entire carbon nanotube film. This local application provides structural integrity and mechanical protection where needed while minimizing the overall heat absorption that would occur with comprehensive insulation coverage.
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 design enhances the durability and sound pressure level of the thermoacoustic device array by protecting the carbon nanotube structures and allowing for efficient heat exchange, while maintaining a long working lifespan and easy reworkability.
Implementation Method 1
When signals are inputted into a sound wave generator, heating is produced in the sound wave generator according to the variations of the signal and/or signal strength
Implementation Method 2
Heat is propagated into surrounding medium. The heating of the medium causes thermal expansion and produces pressure waves in the surrounding medium, resulting in sound wave generation
Data Source
AI summary
A thermoacoustic device array includes a substrate and a plurality of thermoacoustic device units located on a surface of the substrate. The substrate defines a number of recesses on the surface, and the recesses are spaced from and parallel with each other. Each thermoacoustic device unit includes a sound wave generator, a first electrode and a second electrode. The first electrode and the second electrode are spaced from each other and electrically connected to the sound wave generator. The sound wave generator is located on the surface and suspended over the recesses. At least one of the recesses is located between the first electrode and the second electrode, and one portion of the sound wave generator that is between the first electrode and the second electrode is suspended over the at least one of the recesses.