Infrared Laser Marking of Solder Masks
Original Publication Date: 1986-Dec-01
Included in the Prior Art Database: 2005-Mar-09
A very fast, accurate, and economical method of marking printed circuit boards is described which involves training a laser on a solder mask that has been treated to change color with intense heat. At present there are four main ways to mark a printed circuit board. The first is to generate the nomenclature the same way as the circuits. The advantage of this is that there is no chance of mislabeling, every part has the same ID. This is also the disadvantage of this system; it is impossible to serialize the panels. The other problem with having copper labelling is that since it is conductive, it has to be well away from the circuits to prevent spacing violations. This prevents this method from being used to label critical board areas.