Laser Trimming of Embedded Passive Components

摘要

The trend of embedding passive components in printed circuit boards continues. Laser trimming has shown to be a very effective way to bring the tolerances of these embedded components values to the required range. As the demands for PCBs with embedded components grow, volume production is in order. The industry therefore requires a laser trimming system that not only gives precision trimming, edge smoothness, and resin integrity, but has all other characteristics of a true production machine tool, including full automation for 7/24 operation, high throughput and precision, simple set up, and operator friendly interface with local language support. We study the laser trimming of thick and thin film resistors embedded in large format PCBs. Various specific issues with PCB trimming are addressed including probing and testing technologies.