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Proceedings Paper

Laser patterning of lead frames for electroplating
Author(s): Chi Kwan Ho; H. C. Man; T. M. Yue; C. W. Yuen
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Paper Abstract

A novel dry manufacturing process is proposed to replace some of the processing steps in the existing wet silver plating process. It involves the combination of high speed laser patterning and ablation techniques on a polymer masked copper leadframe. A Q-switched Ng-YAG laser with high speed scanning mirrors was initially used in this study. The suitable polymer coating for the relevant electroplating bath has been identified by immersion test and scanning electron microscopy. Process parameters such as scanning rate, protection gas, laser powder, beam size, working distance etc., were investigated. The effect of laser ablation and residual heat input upon the microstructure and properties of the metallic substrate were studied. The plating quality after laser patterning was also examined. A transparent organic film about 1.5 micrometers thick was found to be loosely adhered on the copper substrate regardless of the ablation conditions. This film created a major obstacle to the YAG laser ablation process proposed. Excimer laser was used to overcome this problem.

Paper Details

Date Published: 23 September 1996
PDF: 10 pages
Proc. SPIE 2789, High-Power Lasers: Applications and Emerging Applications, (23 September 1996); doi: 10.1117/12.251169
Show Author Affiliations
Chi Kwan Ho, Hong Kong Polytechnic Univ. (Hong Kong)
H. C. Man, Hong Kong Polytechnic Univ. (Hong Kong)
T. M. Yue, Hong Kong Polytechnic Univ. (Hong Kong)
C. W. Yuen, ASM Assembly Automation Ltd. (Hong Kong)

Published in SPIE Proceedings Vol. 2789:
High-Power Lasers: Applications and Emerging Applications
Georges Sayegh; Michael R. Osborne, Editor(s)

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