Flexible Printed Circuit Redundant Wire Design
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Solution Overview
Problem
Conventional flexible printed circuits are prone to electrical connection damage during manual soldering and assembly due to breakage of conductive metallic wires, resulting in low reliability.
Innovation Solution
The flexible printed circuit design includes a flexible substrate with first and second conductive wires on opposite surfaces, where each second conductive wire is electrically connected to the first wire via conductive structures, such as soldering holes and metal layers, providing redundant signal transmission channels to ensure stability even if the first wire is broken.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual soldering process is used to connect gold fingers to printed circuit board, then electrical connection can be established, but conductive metallic wires are prone to breakage and reliability is reduced
Solution Approach 1:
The patent applies beforehand cushioning by providing a second conductive wire layer on the opposite surface of the flexible substrate that can compensate for wire breakage. When the first conductive wire breaks during manual soldering or assembly, the second conductive wire provides an alternative electrical connection path, preventing complete connection failure and maintaining system reliability.
2Reliability
If single layer of conductive wires is used on flexible substrate, then device complexity is reduced, but electrical connection reliability is compromised due to wire breakage
Solution Approach 1:
The patent applies another dimension by adding the second conductive wire layer on the opposite surface of the flexible substrate, creating a three-dimensional redundant connection structure. This dimensional addition provides alternative electrical paths without significantly increasing planar complexity, as the second layer serves as a backup that only activates when the first layer fails.
3Ease of operation
If conductive metallic wires extend across entire flexible substrate, then signal transmission is enabled, but wires are more susceptible to breakage during assembly
Solution Approach 1:
The patent applies beforehand cushioning by pre-positioning the second conductive wire on the opposite surface to compensate for potential breakage of the first conductive wire during assembly operations. This redundant structure ensures that even if the primary signal transmission path is damaged, electrical connectivity is maintained through the backup wire.
Data Source
AI summary
A flexible printed circuit includes a flexible substrate, a plurality of first conductive wires, and a plurality of second conductive wires. The flexible substrate includes a first surface and a second surface facing the first surface. The first conductive wires are provided on the first surface. The first conductive wires extend from an edge of the flexible substrate to another edge of the flexible substrate. The second conductive wires are provided on the second surface. The second conductive wires extend from an end of the flexible substrate to a predetermined portion of the flexible substrate. A part of each second conductive wire at the predetermined portion of the flexible substrate is electrically connected with the first conductive wire via a conductive structure.