Method of bonding flexible circuit to circuitized substrate to p

Details Method of bonding flexible circuit to circuitized substrate to p Method of bonding flexible circuit to circuitized substrate to p

1991-08-12

1992-07-28

Heinrich, Samuel M.

Metal fusion bonding

Process

Plural joints

228215, 228248, H05K 334

Patent

active

051334950

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, forms a substantially spherical ball and connects to the flexible circuit's conductor, connecting the two. In an alternative embodiment, the solder ball is formed to its desired shape and cooled (to solidification), separate from the flexible circuitized substrate. The flexible substrate is then lowered until the conductor engages the solder ball's upper surface. Heat is then applied to bond solder and conductor.

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