Patent ID: 6918529
Filing Date: 2005-07-19
Classification: H05K

Abstract:
1. A method for producing a metal/ceramic bonding circuit board comprising the steps of: bonding a metal plate of a metal to at least one side of a ceramic substrate via a brazing filler metal; applying a resist on a predetermined portion of a surface of said metal plate to etch and remove an undesired portion of said metal plate to form a metal circuit portion; and removing an undesired portion of said brazing filler metal and a reaction product, which is produced by a reaction of said brazing filler metal with said ceramic substrate, while maintaining said resist, and thereafter, peeling off said resist to form a circuit pattern, wherein a ratio of a mean dissolving rate of said metal to a mean dissolving rate of said brazing filler metal is in the range of from 1 to 20 at said removing step.