DEVICE FOR LASER BEAM DRILLING OF BLIND HOLES IN MULTI-LAYER PRINTED CIRCUIT BOARDS

摘要

A device for laser beam drilling of blind holes in multi-layer printed circuit boards comprises two plasma beam detectors (14, 15) for determination of the plasma radiation emitted from both the conductor strip layer (21) and dielectric intermediate layer (22) and a laser detector (11) for determining the intensity of each laser beam pulse.