PCB Protrusion Block Elevates Metal Support to Prevent Short Circuits
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Solution Overview
Problem
Conventional printed circuit boards face issues with short circuits due to wear-out of insulating films between metal supports and signal traces or conductive vias in routing-limited areas, especially in compact portable devices like notebook computers.
Innovation Solution
Incorporating a protrusion block or metal separating member with a height greater than the signal trace, test point, or via wall in the routing-limited area to elevate the metal support and prevent contact with signal traces, test points, or conductive vias, thereby avoiding short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an insulating film is provided between the metal support and the printed circuit board to prevent short circuits, then short circuit prevention is improved, but the insulating film wears out at locations corresponding to signal traces and test points, leading to short circuits
Solution Approach 1:
The patent introduces a vertical dimension by creating a protrusion block that rises above the board surface. This elevates the metal support to a higher plane, establishing a three-dimensional spatial separation between the support and the signal traces/test points on the board surface, thereby preventing contact without relying on a wear-prone insulating film
Solution Approach 2:
The patent extracts the insulating film from the solution and replaces it with a protrusion block structure. By removing the insulating film and using the elevated support structure itself to create the isolation, the design eliminates the component that was causing the durability problem while maintaining the short circuit prevention function
2Volume of moving object
If the size of notebook computers is minimized to remain compact, then portability is improved, but routing-limited areas must be used for routing, increasing the risk of short circuits
Solution Approach 1:
By utilizing the vertical dimension to elevate the metal support via the protrusion block, the patent enables the use of routing-limited areas for signal routing while maintaining isolation. This allows compact notebook design without sacrificing reliability, as the elevated support structure prevents short circuits even when routing occurs in previously restricted areas
Data Source
AI summary
A printed circuit board includes a board body having a routing-limited area. The routing-limited area is provided with at least one solder pad that is adapted for supporting a metal support thereon. Preferably, the printed circuit board further includes a protrusion block disposed on the solder pad, and having a height greater than that of a signal trace that passes the routing-limited area.