Ceramic copper circuit board and semiconductor device using same

Abstract

A ceramic copper circuit board including a ceramic substrate, and a copper circuit part located on the ceramic substrate, wherein an arbitrary line parallel to a first direction at a cross section of the copper circuit part parallel to the first direction crosses multiple copper crystal grains, the first direction is from the ceramic substrate toward the copper circuit part, an average of multiple distances in a second direction between the line and edges of the copper crystal grains is not more than 300 μm, and the second direction is perpendicular to the first direction.

Dependencies are inferred from the claim text.