Patent ID: 6458263
Filing Date: 2002-10-01
Classification: B81B,B81C,C25D,G03F,H01L

Abstract:
A method of forming a multi-layered LIGA microstructure on a plating base comprising the steps of:(a) providing a first level microstructure having raised conductive portions; (b) covering and surrounding the first level microstructure with a conductive polymer layer; (c) machining the conductive polymer layer to a desired level so as to reveal the surface of the first level microstructure; (d) coating the conductive polymer layer and the surface of the first level microstructure with a metal sealing layer; (e) depositing a second polymer layer onto the metal sealing layer; (f) exposing portions of the second polymer layer to a radiation source to provide a pattern of dissolvable portions in the second polymer layer; (g) removing the dissolvable portions in the second polymer layer to provide accessible underlying areas of the metal sealing layer; (h) removing the accessible underlying areas of the metal sealing layer to provide accessible underlying areas of the first microstructure and the conductive polymer layer; (i) electroplating a second layer of metal onto the accessible underlying areas of the first microstructure and the conductive polymer layer; (j) machining the electroplated metal to provide a substantially planar surface; (k) removing the remainder of the second polymer layer; and (l) removing the metal sealing layer and the conductive polymeric layer to provide a multi-layered microstructure.