Drilling apparatus and method

Details Drilling apparatus and method Drilling apparatus and method

1987-09-03

1989-06-13

Albritton, C. L.

Electric heating

Metal heating

By arc

21912176, B23K 2600

Patent

active

048394971

ABSTRACT:
An apparatus and method for drilling holes in printed wiring boards formed of a plurality materials wherein two or more laser beams are combined along a common path and preferably focussed on the desired drilling site. The wavelengths of the lasers are selected such that they are each rapidly absorbed and therefor vaporized at least one of said materials. The laser beams are preferably focussed by a beam combining mirror. The lasers can be controlled to provide simultaneous or sequential emission of the laser beams.

REFERENCES:
patent: 3453097 (1965-07-01), Hafner
patent: 3932726 (1976-01-01), Verheyen et al.
patent: 3935419 (1976-01-01), Lambert et al.
patent: 4167662 (1979-09-01), Steen
patent: 4323757 (1982-04-01), Oka et al.
patent: 4408602 (1983-10-01), Nakajima
patent: 4535219 (1985-08-01), Sliwa, Jr.
patent: 4661679 (1987-04-01), Pardee
patent: 4707584 (1987-11-01), Kimbara

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