Electric heating – Metal heating – By arc
Reexamination Certificate
2011-07-19
2011-07-19
Heinrich, Samuel M (Department: 3742)
Electric heating
Metal heating
By arc
C219S121710
Reexamination Certificate
active
07982161
ABSTRACT:
An improved method and apparatus for drilling vias in electronic substrates with laser pulses is presented which uses one or more tailored pulses to reduce debris remaining in the via while maintaining system throughput and avoiding damage to the substrate. A tailored pulse is a laser pulse that features a power spike having a peak power 10% higher than the average power of the pulse and lasting less than 50% of the duration of the pulse. Methods and apparatuses for creating tailored pulses by slicing longer duration pulses are shown.
REFERENCES:
patent: 5369659 (1994-11-01), Furumoto et al.
patent: 5574810 (1996-11-01), Byron et al.
patent: 2001/0009250 (2001-07-01), Herman et al.
patent: 2002/0185474 (2002-12-01), Dunsky et al.
Baird Brian
Hardy Gregg
Johansen Brian
Lei Weisheng
Matsumoto Hisashi
Electro Scientific Industries Inc.
Heinrich Samuel M
Leonard Patrick F
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