Fiber-Coated Strain Sensor Structure for Skin Stretch Resistance
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Solution Overview
Problem
Existing flexible electronic functional members lack sufficient stretch resistance when directly adhered to the skin, limiting their ability to accurately obtain biological information and reduce discomfort.
Innovation Solution
An electronic functional member is developed with a fiber network composed of one type of resin, coated with another resin having a lower Young's modulus, and a conductive layer formed on the surface, enhancing stretch resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fiber network of nanofiber is formed by electrospinning with gold vapor-deposited to form an electrode layer, then surface followability, stretchability, permeabilities, and transparency are improved, but stretch resistance is insufficient
Solution Approach 1:
The invention uses a composite structure consisting of a fiber network layer and a coating layer. The fiber network provides flexibility, surface followability, and stretchability, while the coating layer applied on top provides the necessary stretch resistance. This composite material approach allows both characteristics to coexist without compromising either property.
2Illumination intensity
If a fiber network of nanofiber is formed by electrospinning with gold vapor-deposited to form an electrode layer, then transparency and permeabilities are improved, but stretch resistance is insufficient
Solution Approach 1:
The transparent fiber network structure is maintained while adding a coating layer that provides stretch resistance. The coating layer is applied in a manner that does not significantly compromise the transparency of the underlying fiber network, achieving both optical clarity and mechanical strength.
Solution Approach 2:
The coating layer acts as a thin film that provides mechanical protection and stretch resistance while maintaining the flexibility and transparency of the underlying fiber network. The thin film structure allows light to pass through while providing the necessary mechanical strength.
3Reliability
If flexible electronics is manufactured by forming an electronics device on a flexible substrate, then device functionality is achieved, but flexibility and surface followability are insufficient
Solution Approach 1:
The invention uses a fiber network structure with a coating layer that creates an ultra-flexible substrate. This substrate can conform to curved and irregular surfaces while supporting electronic devices, enabling both device functionality and excellent surface followability.
Solution Approach 2:
The fiber network and coating layer structure provides dynamic flexibility, allowing the substrate to bend, stretch, and conform to various surfaces. This dynamic characteristic enables the electronic device to maintain functionality while adapting to different surface geometries.
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 stretch resistance allows for more accurate biological information acquisition and reduced discomfort during skin attachment, while maintaining high surface followability and transparency.
Implementation Method 1
a coating layer having a Young's modulus lower than that of the fiber covering the fiber
Implementation Method 2
a conductive layer formed on the surface of the coating layer
Data Source
AI summary
[Problem] To provide an electronic functional member having high stretch-resistance. [Solution] An electronic functional member provided with: fibers formed in web-like shape and configuring a fiber web; a coating film coating the fibers and having a Young's modulus smaller than that of the fibers; and an electrically conductive film formed on the surface of the coating film.