Stretchable Circuit Board with Reinforcing Base for Handleability
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Solution Overview
Problem
The existing stretchable circuit boards face challenges in handleability during attachment due to deformation and irregular surface compatibility, leading to issues with maintaining a flat state and preventing unintentional attachment to body parts.
Innovation Solution
A stretchable circuit board design featuring a stretchable base material with a reinforcing base of higher rigidity, laminated to surround the conductive pattern, enhancing shape retention and handleability by maintaining the base material in an unfolded state during attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the stretchable base material is made highly flexible to conform to curved surfaces, then adaptability to body parts is improved, but handleability during attachment deteriorates due to unintended deformation and accidental attachment
Solution Approach 1:
The circuit board is divided into two distinct regions: a reinforcing area with higher rigidity and a stretchable area with lower rigidity. This segmentation allows the board to maintain structural integrity and handleability in the reinforcing area while providing flexibility and adaptability in the stretchable area, resolving the contradiction between ease of operation and adaptability
Solution Approach 2:
Different regions of the circuit board are assigned different mechanical properties: the reinforcing area has higher in-plane rigidity for stable handling, while the stretchable area has lower in-plane rigidity for conforming to body surfaces. This local differentiation of quality enables the board to simultaneously achieve good handleability and adaptability
2Ease of operation
If the in-plane rigidity is increased to improve handleability, then ease of operation is improved, but stretchability and conformability to irregular surfaces deteriorate
Solution Approach 1:
The circuit board is segmented into a reinforcing area with higher in-plane rigidity for handleability and a stretchable area with lower in-plane rigidity for stretchability. This spatial segmentation allows both contradictory properties to coexist in different regions of the same structure
Solution Approach 2:
The board exhibits local quality variation where the reinforcing area provides high rigidity for operational ease while the stretchable area provides low rigidity for adaptability. This local differentiation resolves the contradiction by assigning appropriate properties to appropriate regions
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 improves the handleability and shape retention of the stretchable circuit board, preventing unintentional attachment and ensuring proper placement on curved surfaces like the human skin, while maintaining conductivity and flexibility.
Implementation Method 1
the reinforcing base reinforces the stretchable base material by being directly or indirectly laminated on the stretchable base material
Data Source
AI summary
A stretchable circuit board includes a stretchable base material; a stretchable conductive pattern formed on at least one main surface of the stretchable base material and having stretchability; and a reinforcing base having higher rigidity than the stretchable base material, wherein the reinforcing base reinforces the stretchable base material by being directly or indirectly laminated on the stretchable base material so as to surround at least a part of a formation region of the stretchable conductive pattern in the stretchable base material in a plan view.