Apparatus and method using a permanent mandrel for manufacture of electrical circuitry.

摘要

A stainless steel mandrel (10) is etched with a negative pattern (16) of an electrical circuit that is to be made with the mandrel and then covered with Teflon (20) which is subsequently lapped to provide a coplanar surface of stainless steel and Teflon. A pattern of electrical conductors (30) is then electroformed, as by electrolytic or electroplating, on the exposed surfaces (24) of the mandrel between the embedded Teflon (16). Surfaces of the electrical conductors (30) of the circuit are then processed, as required for enhanced adhesion to a substrate, and a dielectric substrate (34) of polyamide and acrylic is then laminated upon the surface of the mandrel over the electroformed conductors (30) so that the dielectric substrate (34) adheres to the conductors (30). The assembly of dielectric substrate (34) and conductors (30) is then separated from the planar surface of the mandrel (10) and its embedded Teflon (16).