Stretchable Wiring Board Wrinkle Control via Segmented Substrate
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Solution Overview
Problem
Existing stretchable wiring boards face challenges in controlling wrinkles that interfere with each other when a substrate is elongated and then relaxed, making it difficult to manage deformation effectively.
Innovation Solution
A wiring board design featuring a stretchable substrate with a reinforcing part and a covering part, where the reinforcing part has greater flexural rigidity or elastic modulus than the substrate, and a control region with specific ridge configurations to prevent wrinkles from interfering, allowing for controlled deformation and reduced risk of damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the substrate is elongated and then relaxed after wiring is disposed, then the wiring board can be made stretchable, but wrinkles are generated in multiple directions that interfere with each other
Solution Approach 1:
The substrate is divided into a control region and a non-control region. The control region contains the wiring and is designed to prevent wrinkle formation, while the non-control region allows wrinkle formation. This segmentation allows different parts of the substrate to have different mechanical behaviors, enabling stretchability while protecting the wiring area from wrinkles.
Solution Approach 2:
Different regions of the substrate are given different properties: the control region has restricted deformation capability to prevent wrinkles, while the non-control region has free deformation capability to accommodate stretching. This local differentiation of mechanical properties resolves the contradiction between overall stretchability and local wrinkle control.
2Adaptability or versatility
If wrinkles are generated in multiple directions on the substrate, then the substrate can accommodate deformation, but the wrinkles interfere with each other making it difficult to control
Solution Approach 1:
By segmenting the substrate into control and non-control regions, the patent simplifies wrinkle control. Wrinkles are allowed to form only in the non-control region, eliminating the complexity of controlling intersecting wrinkles across the entire substrate. This segmentation reduces the control problem to a manageable spatial distribution.
3Strength
If the substrate is made fully stretchable, then it can deform without damage, but wrinkles interfere with the wiring and may cause damage
Solution Approach 1:
The substrate is segmented into a control region that protects the wiring from wrinkles and a non-control region that accommodates deformation. This segmentation ensures that the wiring remains in a protected zone while the overall structure maintains stretchability, thus preserving both damage resistance and wiring integrity.
Solution Approach 2:
The control region acts as an intermediary protective zone between the wiring and the deforming non-control region. It mediates the mechanical stresses by preventing wrinkle formation in the wiring area while allowing deformation elsewhere, thus protecting the wiring from damage caused by wrinkles.
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 prevents wrinkles from interfering with each other, ensuring the wiring board can stretch and contract without sustaining damage, maintaining electrical conductivity and durability.
Implementation Method 1
the substrate is stretchable, and includes a first surface and a second surface located opposite to the first surface
Data Source
AI summary
A wiring board includes a substrate, wiring, and a reinforcing part. The substrate is stretchable, and includes a first surface and a second surface located opposite to the first surface. The wiring is located at the first surface side of the substrate. The reinforcing part overlaps the wiring when viewed in a direction normal to the first surface of the substrate. The substrate has a control region and a non-control region. The control region overlaps the reinforcing part. The non-control region does not overlap the reinforcing part. The non-control region is positioned to sandwich the control region in a direction orthogonal to the direction in which the wiring extends.