Method for improving the alignment of holes with other elements

Details Method for improving the alignment of holes with other elements Method for improving the alignment of holes with other elements

1996-06-06

1998-01-20

Niebling, John

Fishing, trapping, and vermin destroying

437 8, 257797, 361764, 29831, 29833, 29837, H05K 330, H01L 2118

Patent

active

057100632

ABSTRACT:
A method of locating a socket on a printed circuit board which includes the steps of fabricating a plurality of pads and one or more fiducials on the upper surface of the printed circuit board, optically aligning a drill with the fiducial, and then drilling a socket hole through the printed circuit board at the location defined by the fiducial. A peg of the socket is inserted into the socket hole to align the socket with the printed circuit board. Alternatively, a method for locating holes on a printed circuit board includes the steps of forming a master tooling hole through the printed circuit board, locating a fiducial on the printed circuit board using the master tooling hole as a guide, focusing on the fiducial with an optically alignable drill, thereby aligning the drill, and then drilling a hole through the printed circuit board using the aligned drill. The fiducial is selected to be a material which provides a sharp optical contrast with the area surrounding the fiducial, thereby allowing the drill to be easily and accurately focused on the fiducial.

REFERENCES:
patent: Re32910 (1989-04-01), Stuckler
patent: 4521262 (1985-06-01), Pellegrino
patent: 4631100 (1986-12-01), Pellegrino
patent: 4642160 (1987-02-01), Burgess
patent: 4804615 (1989-02-01), Larson et al.
patent: 5468996 (1995-11-01), Chan et al.
patent: 5523920 (1996-06-01), Machuga et al.
patent: 5545308 (1996-08-01), Murphy et al.

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