Metal working – Method of mechanical manufacture – Electrical device making
Patent
1991-08-12
1993-04-20
Gorski, Joseph M.
Metal working
Method of mechanical manufacture
Electrical device making
29831, 29840, 2281802, 228215, H05K 336
Patent
active
052030750
ABSTRACT:
A method of bonding a flexible circuitized substrate to a circuitized substrate (e.g., printed circuit board) to interconnect selected circuitry of both substrates using solder. Solder paste is applied over conductive pads on the circuitized substrate and organic dewetting material (e.g., epoxy coating) adjacent thereto. The flexible substrate, having conductors located within and/or traversing an aperture in the flexible substrate's dielectric, is positioned above the solder paste and heat is applied (e.g., in an oven). The paste, dewetting from the organic material, "balls up" and substantially surrounds a solder member (ball) attached to a bridging portion of the flexible substrate's conductor, thereby connecting both substrates. A frame member may be used to align the flexible substrate, both during solder member attachment thereto, as well as for aligning the flexible substrate having solder members attached, to the respective solder paste locations on the lower substrate.
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Angulas Christopher G.
Flynn Patrick T.
Funari Joseph
Kindl Thomas E.
Orr Randy L.
Dungba Vo Peter
Fraley Lawrence R.
Gorski Joseph M.
Inernational Business Machines
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