Patent ID: 6074893
Filing Date: 2000-06-13
Classification: H01L,H05K,Y10T

Abstract:
A process for forming a fine thick-film conductor pattern on a ceramic substrate comprising the steps of:(A) forming a positive-working photoresist layer on the ceramic substrate;(B) forming grooves arranged in a predetermined fine pattern in the positive-working photoresist layer by exposing the photoresist layer to radiation through a photomask followed by development;(C) filling the grooves formed in the photoresist layer with a conductive paste which comprises a conductor component, a binder, and a solvent by squeezing the paste into the grooves using a squeegee, said squeezing being performed by the screen printing technique using a mask having openings with a fine pattern of the same configuration as that of the grooves formed in the photoresist layer;(D) drying the conductive paste in the grooves;(E) subjecting the grooved positive-working photoresist layer to blanket exposure after step (B), (C), or (D);(F) removing the positive-working photoresist layer by treatment with a developing solution while leaving a fine thick-film pattern of the dried conductive paste on the ceramic substrate; and(G) firing the substrate to sinter the conductor component in the conductive paste and form a fine thick-film conductor pattern bonded to the ceramic substrate.