Patent ID: 8415586
Filing Date: 2013-04-09
Classification: B23K,H05K

Abstract:
1. A method for increasing throughput of laser removal of mask material covering a solder pad by minimizing a total number N of pulses used to remove mask material and to expose a surface of solder pad, wherein the total number N of laser pulses includes a bulk number N 0 of bulk removal pulses employed to remove bulk solder mask material with a laser removal-bulk material interaction and a bottom surface cleaning number δN of surface cleaning pulses employed to clean the surface of the solder pad with a laser cleaning-material interaction, comprising: generating, from a laser, laser output having a fluence F and including the total number N of laser pulses for removing the bulk solder mask material and for cleaning the surface of the solder pad, wherein at least of the laser pulses has a pulsewidth τ; and sequentially directing the total number N of laser pulses, wherein δN has a relationship to F/τ