Computer card with a printed circuit board with vias providing s

Details Computer card with a printed circuit board with vias providing s Computer card with a printed circuit board with vias providing s

1998-11-16

2000-04-04

Picard, Leo P.

Electricity: electrical systems and devices

Housing or mounting assemblies with diverse electrical...

For electronic systems and devices

361760, 361764, 361765, 361767, 257774, 257773, 257780, 257782, 439 65, 439 66, H05K 118

Patent

active

060469099

ABSTRACT:
A card for a computer is described which has a printed circuit board having a substrate which includes a number of layers, and vias extending into the substrate. By configuring the vias correctly they can be used for distributing stresses on the printed circuit board which may result from a combined effect of a change in temperature and a mismatch between thermal coefficients of the printed circuit board and an electronic device mounted to the printed circuit board. The vias may be configured by providing more deep vias which extend through more layers of the substrate, by positioning the deeper vias correctly, and by controlling the dimensions of contact pads which are connected to the vias. By correctly configuring the vias, stresses on the printed circuit board can be reduced to and extent which would allow for a substrate having fewer layers and having larger surface areas.

REFERENCES:
patent: 5173055 (1992-12-01), Grabbe
patent: 5479319 (1995-12-01), Werther
patent: 5764485 (1998-06-01), Lebaschi
patent: 5847936 (1998-12-01), Forehand et al.
patent: 5901050 (1999-05-01), Imai
patent: 5906042 (1999-05-01), Lan et al.

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