Method of making electrical connections in the manufacture of wi

Details Method of making electrical connections in the manufacture of wi Method of making electrical connections in the manufacture of wi

1993-03-18

1996-03-12

Vo, Peter

Metal working

Method of mechanical manufacture

Electrical device making

29843, 29844, 174263, 174265, 228254, 439 83, 439 84, H05K 336, H05K 340, H05K 346, H01R 909

Patent

active

054975450

ABSTRACT:
A multi-layer wiring assembly including a stack of insulating layers, e.g. of polyimide, alternating with wiring patterns, typically of copper. To establish the circuit pattern, successive wiring patterns are connected to one another through the intervening insulating layers at predetermined locations, by metal stud connections. The studs are formed during assembly of the stack by wire-bonding a stud onto an underlying wiring pattern through a through-hole of the insulating layer above, and then stamping the exposed end of the wire-bonded stud to spread it into contact with the uppermost wiring pattern. The wire-bonded studs e.g. of Au, form strong bonds with the underlying conductor and are quick to apply in an automated process using a wire-bonding machine.

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