Patent ID: 6560864
Filing Date: 2003-05-13
Classification: H01F,H05K,Y10T

Abstract:
A process for manufacturing a flat coil, comprising the sequential steps of:providing a substrate; on said substrate, depositing a layer of titanium and then a seed layer of copper; coating the copper layer with photoresist and then patterning and developing the photoresist to form a frame that defines the shape of a coil; by means of electroplating, depositing additional copper on all exposed copper surfaces, said electroplated copper having an upper surface and a thickness; by means of electroplating, depositing a layer of gold on said upper surface; removing all photoresist; by means of reactive ion etching in a gaseous mixture, converting all copper in said seed layer to copper chloride; removing the copper chloride by rinsing in very dilute hydrochloric acid, thereby forming the flat coil and exposing said titanium layer; and exposing the coil and the titanium to an oxygen plasma thereby removing any remaining copper chloride and converting all titanium to titanium oxide.