Patent ID: 6039889
Filing Date: 2000-03-21
Classification: H05K

Abstract:
A method of manufacturing a flexible circuit board from a dielectric substrate having conductive layers disposed on both sides of the substrate, the method comprising the steps of:(a) forming a layer of photoresist on one of the conductive layers, wherein the conductive layer upon which the layer of photoresist is deposited is an underlying conductive layer;(b) forming an aperture passing through the layer of photoresist, the underlying conductive layer, and the dielectric substrate;(c) exposing the layer of photoresist to a pattern of actinic radiation;(d) forming conductive material within the aperture;(e) once steps (b), (c), and (d) have been performed, developing the exposed photoresist layer to expose portions of the underlying conductive layer;(f) once step (e) has been performed, defining at least one conductive trace using the underlying conductive layer, and using the developed photoresist layer as a mask, the conductive trace being electrically connected to the conductive material within the aperture; and(g) once step (f) has been performed, removing said developed photoresist layer.