This report describes the features of Cu-direct laser drilled hole quality on multi-layer Printed Wiring Boards (PWBs). Cu-direct laser drilling drills the outer copper foil and build-up layer at the same time, which makes it difficult to form a blind via hole (BVH) with high quality because the copper foil has high reflection coefficient for a CO2 laser with wavelength 10.6 μm. Therefore, this study focused on improving drilled hole qualities such as diameter and overhang. First, the influence of laser irradiation conditions on forming BVH and the drilled hole diameter were investigated in detail. Second, a new method employing thermography was proposed in order to evaluate the absorption of copper foil after surface treatment. Third, the effect of mixing fillers into the build-up layer in order to reduce the amount of overhang was shown to be effective both experimentally and theoretically. As a result, it is clear that decreasing the difference in the laser absorption rate of the outer copper foil is an effective means to control the hole diameter and reducing the heat characteristic difference between the outer copper foil and the build-up layer can effectively decrease overhang.
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ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems collocated with the ASME 2005 Heat Transfer Summer Conference
July 17–22, 2005
San Francisco, California, USA
Conference Sponsors:
- Heat Transfer Division and Electronic and Photonic Packaging Division
ISBN:
0-7918-4200-2
PROCEEDINGS PAPER
Cu-Direct Via-Hole Drilling of Aramid Fiber Reinforced Build-Up Layer by CO2 Laser Beam
Eiichi Aoyama,
Eiichi Aoyama
Doshisha University, Kyoutanabe, Kyoto, Japan
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Toshiki Hirogaki,
Toshiki Hirogaki
Doshisha University, Kyoutanabe, Kyoto, Japan
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Keiji Ogawa,
Keiji Ogawa
Doshisha University, Kyoutanabe, Kyoto, Japan
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Nobuyuki Doi,
Nobuyuki Doi
Doshisha University, Kyoutanabe, Kyoto, Japan
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Ryu Minagi
Ryu Minagi
Santen Pharmaceutical Company, Ltd., Taga, Shiga, Japan
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Eiichi Aoyama
Doshisha University, Kyoutanabe, Kyoto, Japan
Toshiki Hirogaki
Doshisha University, Kyoutanabe, Kyoto, Japan
Keiji Ogawa
Doshisha University, Kyoutanabe, Kyoto, Japan
Nobuyuki Doi
Doshisha University, Kyoutanabe, Kyoto, Japan
Ryu Minagi
Santen Pharmaceutical Company, Ltd., Taga, Shiga, Japan
Paper No:
IPACK2005-73114, pp. 1797-1804; 8 pages
Published Online:
March 4, 2009
Citation
Aoyama, E, Hirogaki, T, Ogawa, K, Doi, N, & Minagi, R. "Cu-Direct Via-Hole Drilling of Aramid Fiber Reinforced Build-Up Layer by CO2 Laser Beam." Proceedings of the ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems collocated with the ASME 2005 Heat Transfer Summer Conference. Advances in Electronic Packaging, Parts A, B, and C. San Francisco, California, USA. July 17–22, 2005. pp. 1797-1804. ASME. https://doi.org/10.1115/IPACK2005-73114
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