Patent ID: 6553662
Filing Date: 2003-04-29
Classification: H05K,Y10T

Abstract:
A method of making a high-density circuit, comprising:a) providing a master tool having walls and grooves which define a desired circuit pattern, b) creating an electroform by electroplating over the master tool, wherein the electroform includes a plurality of tongues and grooves corresponding to the grooves and walls of the master tool, c) pressing the electroform into a ceramic substrate to form a pattern of grooves and walls in the substrate, d) creating a stencil by electroforming a plurality of U-shaped members over a tool having a same pattern of walls and grooves as the master tool, and placing the stencil over the substrate, wherein the U-shaped members fit over the walls of the substrate and wherein the U-shaped members are open near a bottom of the grooves, e) applying a cermet paste over the stencil, such that the cermet paste fills a space at the bottom of the grooves, and such that the paste also fills spaces between the U-shaped members, f) removing the stencil from the substrate, so as to leave the substrate with cermet paste deposited in the grooves of the substrate, and g) firing the substrate with the cermet paste therein.