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Article: Research results from S. Takeno and colleagues update understanding of science.
- Article from:
- Electronics Newsweekly
- Article date:
- November 11, 2009
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"The drilling of microvias for epoxy-glass printed wiring boards (PWBs) by CO2 laser radiation was studied experimentally and theoretically. In the experimental approach, the effects of laser pulse duration and frequency on the thickness of the carbonized layer surrounding the drilled holes were investigated for pulse durations of 50-120 mu s and frequencies of 20-80 Hz," researchers in Japan report.
"It was found that carbonization takes place at frequencies higher than a certain value and that the frequency becomes lower as the pulse duration increased. Heat accumulation was investigated theoretically in the region near the drilled holes during the removal ...