Stretchable Wiring Board Meandering Shape Control
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Solution Overview
Problem
Wiring boards with deformable substrates face issues such as inconsistent resistance values due to variations in substrate thickness, elongation, and wiring distribution, leading to potential damage like breaks when the substrate extends significantly.
Innovation Solution
A wiring board with a stretchable substrate and a stretching control mechanism that includes stretching control parts aligned along the substrate's surface, controlling extension and contraction, and featuring a meandering shape section with specific periodicity and amplitude to maintain wiring integrity during substrate deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a meandering shape section is formed in the wiring to accommodate substrate extension, then the wiring can suppress resistance value changes during extension, but the height of peaks and depth of valleys vary according to position due to substrate thickness variation and elongation variation, causing localized significant curvature and bending that may lead to wiring breaks
Solution Approach 1:
The patent changes the physical parameters of the substrate by controlling the amplitude and wavelength of the meandering shape section within specific ranges (amplitude: 1-100 μm, wavelength: 10-1000 μm). This parameter optimization ensures that the meandering section can accommodate substrate extension while maintaining consistent peak heights and valley depths, preventing localized excessive curvature and bending that would cause wiring breaks.
2Adaptability or versatility
If the substrate is made stretchable to enable deformability, then the electronic device can be extended and contracted, but the resistance value of the wiring readily changes as the substrate extends and contracts
Solution Approach 1:
The patent introduces a meandering shape section with specific curvature characteristics into the wiring. The controlled amplitude and wavelength create a periodic undulating structure that allows the wiring to expand and contract with the substrate while maintaining electrical continuity. This curvature design enables the wiring to accommodate substrate deformation without significant resistance changes, resolving the contradiction between deformability and resistance stability.
3Reliability
If the amplitude of the meandering shape section is increased to better accommodate substrate extension, then the wiring can suppress resistance value changes more effectively, but the degree of curvature and bending becomes locally significant, increasing the risk of wiring damage
Solution Approach 1:
The patent optimizes the amplitude parameter within a specific range (1-100 μm) to balance two competing requirements: sufficient amplitude to accommodate substrate extension and maintain resistance stability, versus limited amplitude to prevent excessive curvature and bending that would weaken the wiring. This parameter optimization resolves the contradiction between resistance stability and wiring strength.
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 stabilizes the meandering shape section, reducing localized curvature and bending in the wiring, thereby preventing damage and maintaining consistent resistance values even during significant substrate extension.
Implementation Method 1
When the substrate is extended, the wiring is able to accommodate the extension of the substrate due to the spreading of the meandering shape section in the planar direction
Implementation Method 2
a stretching control mechanism that controls extension and contraction of the substrate, wherein the stretching control mechanism at least includes stretching control parts that are positioned in the wiring region of the substrate and that are aligned along the first direction
Data Source
AI summary
A substrate that is stretchable and that at least has a wiring region; wiring at least positioned in the wiring region on a first surface side of the substrate, the wiring having a meandering shape section that includes peaks and valleys aligned along a first direction that is one of planar directions of the first surface of the substrate; and a stretching control mechanism that controls extension and contraction of the substrate. The stretching control mechanism at least includes stretching control parts that are positioned in the wiring region of the substrate and that are aligned along the first direction.