Verfahren zur Herstellung von gedruckten Mehrschicht-Leiterplatten.

摘要

A method of manufacturing a multilayer wiring board is provided in which interlayer connection is made between a first electric circuit and a second electric circuit, both electric circuits being formed on a substrate. Firstly a metal layer is applied onto the substrate and a photoresist is deposited onto the metal layer. Then the photoresist is partially removed to produce a resist hole and the remaining photoresist is selectively exposed in accordance with the desired pattern for the first electric circuit. Next a conductive pillar is formed in the resist hole, followed by the removal of the exposed remaining photoresist to reveal corresponding regions of the metal layer below. These regions of the metal layer are then etched to partly expose the substrate and to form said first electric circuit. All remaining photoresist is removed and an insulation layer is deposited on the first electric circuit, the exposed substrate, and the conductive pillar, such that only one end of the conductive pillar remains exposed. Then a second metal layer is deposited on the surface of the insulation layer and the exposed end of the conductive pillar to form the second electric layer cirrcuit. The above method facilitates accurate alignment between the first wiring circuit and the conductive pillar and hence enables high density circuits to be achieved. It also reduces the number of manufacturing steps required since the same photoresist layer is used in both the resist hole formation step and the circuit pattern formation step.