FPC Cutting Method with Edge Protrusions to Prevent Wire Short Circuits
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing methods for cutting flexible printed circuit boards (FPCs) result in wire-ends extending out of the substrate edge, leading to potential short-circuits when used in devices like mobile phones due to mismatched material cutting, causing improper contact with other components.
Innovation Solution
A cutting method that includes leaving protrusions at the substrate edge, where no wires pass, ensuring the protrusion length exceeds the wire-end extension, preventing contact with other components and thus avoiding short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If FPC is cut according to customer's requirement for connection size, then adaptability to different connection sizes is improved, but wire-ends extend out of substrate edge causing short-circuit risk
Solution Approach 1:
The patent introduces a protrusion structure at the substrate edge as an intermediary element between the wire-end and the external environment. This protrusion, made of substrate material, physically blocks the wire-end from extending beyond the substrate edge and contacting other components, thereby eliminating the short-circuit risk while preserving the ability to cut FPC to different sizes
Solution Approach 2:
The protrusion structure is formed at the substrate edge before the final cutting operation. This preliminary structural preparation ensures that when the FPC is later cut to various customer-specified sizes, the wire-ends are already constrained by the pre-formed protrusions, preventing them from extending beyond the substrate edge regardless of the final cut position
Data Source
AI summary
A conductive connection such as a flexible printed circuit board (FPC) or flexible flat cable is disclosed. The conductive connection has a substrate and conductive wires provided on the substrate. After the conductive connection is cut to be put into application, ends of the wires extend out of an edge of the substrate due to the cutting. In accordance with the present invention, the substrate edge from which the wire ends extend out has protrusions provided. Accordingly, when the conductive connection is applied to a flat display of a mobile phone, for example, short circuit resulting from the wire ends extending out of the substrate edge improperly contacting metal portion of other phone parts is avoided.