Extensible Mounting Board With Hard Resin Cutout
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Solution Overview
Problem
Existing mounting boards lack extensible and contractible properties, leading to stress concentration and potential disconnection or resistance increase in wiring lines when attached to a living body, as they extend and contract.
Innovation Solution
An extensible and contractible mounting board with a substrate, wiring lines, and a hard resin portion that overlaps the wiring lines, featuring a cutout portion to reduce stress and prevent disconnection and resistance increase, where the hard resin's Young's modulus is higher than the substrate's.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the mounting board is made extensible and contractible to follow living body movement, then adaptability is improved, but stress concentration in wiring line connection regions increases leading to disconnection or resistance increase
Solution Approach 1:
The patent introduces a hard resin portion with different mechanical properties (higher Young's modulus) at the specific location of the wiring line connection region. This creates local quality differentiation where the mounting board has extensible properties in general but rigid support at critical connection points, resolving the contradiction between overall adaptability and local reliability
Solution Approach 2:
The patent combines the extensible substrate material with a hard resin portion to create a composite structure. This composite approach allows the mounting board to exhibit both extensibility (from the substrate) and stress resistance (from the hard resin portion), simultaneously achieving adaptability and wiring line connection reliability
2Reliability
If the hard resin portion completely covers the wiring line for maximum protection, then reliability is improved, but the wiring line cannot extend and contract freely causing stress concentration
Solution Approach 1:
The hard resin portion is segmented with a cutout that divides it into regions, allowing the wiring line to pass through freely. This segmentation enables the wiring line to maintain extensibility while the hard resin provides protective coverage at critical connection points, resolving the contradiction between reliability and adaptability
Solution Approach 2:
A cutout portion is extracted from the hard resin portion to create a passage for the wiring line. This allows the wiring line to extend and contract freely through the hard resin portion without being completely enclosed, maintaining both protection and flexibility
Data Source
AI summary
An extensible and contractible mounting board that includes an extensible and contractible substrate; an extensible and contractible wiring line on one main surface of the extensible and contractible substrate; an electronic component electrically connected to the extensible and contractible wiring line; and a resin portion in contact with the extensible and contractible wiring line and overlapping an end portion of a connection region between the extensible and contractible wiring line and the electronic component in a plan view of the extensible and contractible mounting board, the resin portion having a cutout portion that overlaps the extensible and contractible wiring line. A Young's modulus of the resin portion is higher than a Young's modulus of the extensible and contractible substrate.