Patent ID: 6328201
Filing Date: 2001-12-11
Classification: H01L,H05K,Y10S,Y10T

Abstract:
A method of producing a multilayer wiring substrate, which comprises the steps of:preparing a plurality of double-sided circuit substrates each comprising an insulating layer which comprises an organic high molecular weight resin having formed on both surfaces thereof wiring conductors, both the wiring conductors being electrically connected by a throughhole, and an adhesive sheet having holes at positions corresponding to definite portions of the wiring conductors of the double-sided circuit substrates;temporarily adhering the adhesive sheet to the double-sided circuit substrates in a state that the holes of the adhesive sheet are position-matched with the definite portions of the wiring conductors of the double-sided circuit substrates,filling up the holes of each adhesive sheet with a solder paste and heat-melting the solder paste to form a solder bump; andposition-matching such that the wiring conductors of the double-sided circuit substrates can be electrically connected in a predetermined manner, piling up the double-sided circuit substrates, and then heat-pressing a resulting assembly to integrate into a body.