Metal working – Method of mechanical manufacture – Electrical device making
Patent
1995-12-29
1998-11-03
Arbes, Carl J.
Metal working
Method of mechanical manufacture
Electrical device making
29832, 174250, H05K 334
Patent
active
058291245
ABSTRACT:
A method for attaching pads to a high density printed circuit board (PCB) having a plurality of through-holes opening on the top surface. The method includes forming a plurality of pads on a carrier sheet so that each of said pads have a copper layer proximate to said carrier sheet and a joining metal layer formed on top of said copper layer, positioning the plurality of pads on the carrier sheet so that they are aligned with the through-hole pattern on the top surface of the PCB, laminating the pads to the through-holes on the top surface using the joining metal, and separating the carrier sheet from the plurality of pads that are joined to the through-holes so that the copper layer is exposed. The pads may comprise a variety of shapes such as disk-shaped, elongated, or rectangular, and can cover one or multiple through-holes. An electrical component may be soldered to the pad. The method advantageously prevents wicking of the solderball volume into the through-hole, thereby increasing yield and part reliability. In one embodiment, the pad and through-hole may be compressed so that the top surface of the pad is even (flush) with the top surface of the external dielectric surface.
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Kresge John Steven
Light David Noel
Arbes Carl J.
International Business Machines - Corporation
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