Controlled depth laser drilling system

Details Controlled depth laser drilling system Controlled depth laser drilling system

1987-07-15

1988-12-06

Albritton, C. L.

Electric heating

Metal heating

By arc

21912176, 21912171, 21912174, 21912175, B23K 2600

Patent

active

047897708

ABSTRACT:
A controlled depth laser drilling system for a workpiece containing metallic conductors is provided having at least one laser beam (56 and/or 57 of FIG. 5) where a portion of the laser beam (44) will be reflected from the workpiece and back to a drilling depth monitoring means (43) containing optical means capable of reflecting a portion of the original and reflected laser beams into radiation detector means (46', 46" and/or 45', 45"), where the detector means are capable of converting the radiation received into a measurable electrical signals.

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W. R. Wrenner, "Generating Small Holes for IBM's New LSI Package Design", IPC-TP-446; IPC Fall Meeting, Oct. 1982.
L. Fenichel, "Laser Drilling: Not A Boring Story", Circuits Manufacturing, vol. 24, Feb. 1984, pp. 49-54.

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