Stretchable Wiring Board Peeling Strength Design
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Solution Overview
Problem
Conventional stretchable wiring boards face disconnection issues when attached to flexible and moving objects, such as living bodies, due to stress applied from multiple directions, which can lead to breakage at the connection portion between the first and second wiring.
Innovation Solution
A stretchable wiring board design where the peeling strength between the main body and the first/second wiring is lower than the peeling strength between the first and second wiring, allowing stress to be released and maintaining electrical connection by peeling between the main body and the wiring, potentially incorporating a void or waterproof layer to absorb stress and prevent moisture penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the stretchable wiring board is attached to a flexible and moving object, then adaptability is improved, but the connection portion between wirings is prone to breakage due to multi-directional stress
Solution Approach 1:
The patent changes the peeling strength parameter of the main body to be smaller than the peeling strength between wirings, creating a controlled weak point that allows stress relaxation while maintaining wiring connection integrity
Solution Approach 2:
The main body acts as an intermediary element between the wirings and the external environment, absorbing multi-directional stress through controlled peeling at its interfaces, thereby protecting the wiring connections from breakage
2Stress or pressure
If peeling strength between main body and wiring is reduced, then stress release is improved, but bonding reliability may deteriorate
Solution Approach 1:
The patent applies different peeling strength characteristics to different locations: the main body has smaller peeling strength for stress release, while the wiring connections maintain higher peeling strength for reliable bonding, creating localized functional differences
Data Source
AI summary
A stretchable wiring board that includes: a main body; a stretchable first wiring on the main body; and a stretchable second wiring on the main body and connected to the stretchable first wiring, wherein at least one of a first peeling strength between the main body and the stretchable first wiring and a second peeling strength between the main body and the stretchable second wiring is smaller than a third peeling strength between the stretchable first wiring and the stretchable second wiring.