Stretchable Wiring Board Wrinkle Control via Segmented Regions
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Solution Overview
Problem
The existing manufacturing methods for stretchable wiring boards result in wrinkles that interfere with each other, making it difficult to control and manage the deformation of the substrate and interconnection wires when stretched and relaxed.
Innovation Solution
A wiring board design with a stretchable portion having distinct regions of varying modulus of elasticity, where the interconnection wire is strategically placed over regions with a lower modulus of elasticity, and a support portion with a higher modulus of elasticity to manage deformation and reduce interference between wrinkles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the substrate is stretched and then relaxed after interconnection wire is disposed, then the wiring board has stretchability, but wrinkles are generated in multiple directions that interfere with each other and are difficult to control
Solution Approach 1:
The substrate is divided into multiple independent wrinkle control portions that can deform independently. Each wrinkle control portion contains wrinkles in specific directions, and by segmenting the substrate into these portions, the interference between wrinkles in different directions is reduced, allowing for better control of wrinkle formation during stretching and relaxation.
Solution Approach 2:
Different regions of the substrate are designed with different wrinkle characteristics. The wrinkle control portions have specific wrinkle patterns optimized for their local deformation requirements, while other regions may have different properties. This local optimization allows the substrate to accommodate stretching in multiple directions without uniform wrinkle interference across the entire surface.
2Adaptability or versatility
If the substrate is stretched in first and second directions, then the wiring board can accommodate multi-directional deformation, but wrinkles extending in both directions interfere with each other
Solution Approach 1:
The substrate is segmented into wrinkle control portions that independently manage deformation in different directions. Each portion contains wrinkles primarily in one direction, preventing the interference that would occur if wrinkles formed in both directions across the entire substrate. This segmentation maintains electrical conductivity by ensuring that interconnection wires passing through specific regions are not subjected to conflicting wrinkle deformations.
Solution Approach 2:
The wrinkle control portions act as intermediary elements between the stretching forces applied in different directions and the interconnection wires. These portions absorb and manage the deformation through controlled wrinkle formation, protecting the interconnection wires from the harmful effects of multi-directional wrinkle interference while still allowing the overall substrate to stretch.
3Adaptability or versatility
If circuitry is provided on a stretched substrate and then the substrate is relaxed, then the wiring board has stretchability, but the wrinkles make it difficult to control the deformation
Solution Approach 1:
The substrate is divided into wrinkle control portions that can be independently controlled during stretching and relaxation. By segmenting the substrate into these functional regions, operators can control the deformation of each portion separately, making it easier to manage the overall deformation process and achieve the desired stretchability without uncontrolled wrinkle formation.
Solution Approach 2:
The wrinkle control portions are pre-designed with specific wrinkle patterns and mechanical properties before the circuitry is formed. This preliminary structuring of the substrate allows for predictable and controllable deformation behavior during subsequent stretching and relaxation operations, making the process easier to operate and control.
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 effectively controls the deformation of the wiring board, reducing interference between wrinkles and maintaining electrical conductivity, even under tensile stress, thereby enhancing the reliability and durability of the stretchable wiring board.
Implementation Method 1
a stretchable portion having stretchability... The second region has a lower modulus of elasticity than the first region
Data Source
AI summary
A wiring board on which electronic components are mountable includes a stretchable portion having stretchability and having a first surface and a second surface opposite to the first surface, and an interconnection wire electrically connected to the electronic components mounted on the wiring board. The stretchable portion includes first regions lined up in each of a first direction and a second direction, a second region including first portions and second portions, and a third region surrounded by the second region. The first regions overlap the electronic components. The first portion extends from one of two first regions neighboring each other in the first direction to the other thereof. The second portion extends from one of two first regions neighboring each other in the second direction to the other thereof. The second region has a lower modulus of elasticity than the first region. The interconnection wire overlaps the second region.