This report describes the quality assessment of blind via holes (BVHs) of Printed Wiring Boards (PWBs) drilled by a CO2 laser using Cu-direct drilling. In the Cu-direct drilling method, the copper foil and the buildup layer are melted at the same time, and the surface is treated to increase the laser energy absorbed by the copper foil because an untreated copper surface reflects most of the 10.6-μm-wavelength CO2 laser beam. We used black-oxide and V-bond treatments as surface treatment. Previously, the only black-oxide treatment was paid attention to, but the new V-bond treatment is also investigated in this report. First, a straightforward method employing infrared thermography was proposed to determine the absorbance of the CO2 laser beam by the copper surface. Then, we used SEM to characterize the copper surfaces after surface treatment, and established the relationship between laser absorbance and surface shape. Subsequently, we observed the circumference of a point irradiated with the CO2 laser and explained melting processes were different from surface shape. Finally, we investigated the relationship between laser absorbance and BVH quality, and showed that a high absorbance improved BVH quality.
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ASME 2007 InterPACK Conference collocated with the ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference
July 8–12, 2007
Vancouver, British Columbia, Canada
Conference Sponsors:
- Electronic and Photonic Packaging Division
ISBN:
0-7918-4277-0
PROCEEDINGS PAPER
Influence of Cu Surface Treatment on the Cu-Direct Via Hole Drilling Efficiency of PWBs
Toshiki Hirogaki,
Toshiki Hirogaki
Doshisha University, Kyotanabe, Kyoto, Japan
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Eiichi Aoyama,
Eiichi Aoyama
Doshisha University, Kyotanabe, Kyoto, Japan
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Keiji Ogawa,
Keiji Ogawa
University of Shiga Prefecture, Hikone, Shiga, Japan
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Shogo Matsutani
Shogo Matsutani
Doshisha University, Kyotanabe, Kyoto, Japan
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Toshiki Hirogaki
Doshisha University, Kyotanabe, Kyoto, Japan
Eiichi Aoyama
Doshisha University, Kyotanabe, Kyoto, Japan
Keiji Ogawa
University of Shiga Prefecture, Hikone, Shiga, Japan
Shogo Matsutani
Doshisha University, Kyotanabe, Kyoto, Japan
Paper No:
IPACK2007-33194, pp. 895-900; 6 pages
Published Online:
January 8, 2010
Citation
Hirogaki, T, Aoyama, E, Ogawa, K, & Matsutani, S. "Influence of Cu Surface Treatment on the Cu-Direct Via Hole Drilling Efficiency of PWBs." Proceedings of the ASME 2007 InterPACK Conference collocated with the ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference. ASME 2007 InterPACK Conference, Volume 1. Vancouver, British Columbia, Canada. July 8–12, 2007. pp. 895-900. ASME. https://doi.org/10.1115/IPACK2007-33194
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