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Process Date: January 2003
LPI (Liquid photo-imageable) solder masks are widely used on circuit boards as they offer high resolution, excellent electrical properties and compatibility with surface mount technology. This LPI solder mask was marked using a Synrad CO2 laser and FH Series marking head without exposing the electrical traces, or otherwise damaging the board. The 10.6 micron CO2 wavelength discolors the surface, which produces the highly contrasting mark.
A 0.075” square spot-style Data Matrix code and a 0.045”-high human-readable text object were marked through a 125mm focusing lens using 3W of laser power. Mark velocity was 7 inches per second, giving a total cycle time of 0.9 seconds.
This LPI solder mask was marked using a 10W Synrad CO2 laser and FH Series marking head.
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