Abstract
PurposeThe purpose of this paper is to discuss laser cutting of FR4, and BT/Epoxy‐based PCB substrates with 355 nm DPSS UV laser.Design/methodology/approachThe effects of various laser conditions such as scanning speed, assisting gas, repetition rate and interval between scans on the heat affected zone (HAZ) and charring are studied. The quality and morphology of laser cut PCB substrates are analyzed with optical microscopy, and scanning electron microscopy (SEM). Also, the laser cut PCB substrates are evaluated by humidity testing and thermal cycle testing.FindingsMulti‐pass cutting at high scanning speed, with O2 assist gas was found to be able to achieve high quality cutting with little charring. It was also found that a certain time interval between scans and higher repetition rates led to a reduced heat affected zone and less charring.Originality/valueThis paper demonstrates high quality laser cutting of PCB substrates with no delamination, little charring and minimum HAZ. The developed process has important potential applications in the electronics industry.
Subject
Electrical and Electronic Engineering,Industrial and Manufacturing Engineering
Reference9 articles.
1. Henry, M., Harrison, P., Wendland, J. and Parsons‐Karavassilis, D. (2005), “Cutting Flexible Printed Circuit Board with a 532 nm Q‐switched diode pumped solid state laser”, Proceedings of ICALEO.
2. Huske, M. (2006), “Burr and stress‐free cutting of flexible printed circuits”, OnBoard Technology, Vol. 6, pp. 18‐21.
3. Kuper, S. and Brannon, J. (1992), “Ambient gas effects on debris formed during KrF laser ablation of polyimide”, Appl. Phys. Lett., Vol. 60, pp. 1633‐5.
4. Lange, B. (2005), “PCB Machining and Repair Via Laser”, OnBoard Technology, Vol. 2, pp. 12‐14.
5. Meier, D. and Schmidt, S.H. (2002), “PCB Laser Technology for Rigid and Flex HDI – Via Formation, Structuring and Routing”, Proceedings of IPC Printed Circuits Expo, pp. ADD‐2‐1∼5.
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