Patent ID: 11756845

Abstract:
A glass carrier-attached copper foil is provided that can achieve a desired circuit mounting board that reduces separation of a copper layer at the cut edge even if the copper foil is downsized to dimensions enabling mount of a circuit, and has an intended circuit pattern with a fine pitch. The glass carrier-attached copper foil includes a glass carrier, a release layer, and a copper layer with a thickness of 0.1 to 3.0 μm. The glass carrier has, at least on its surface having the copper layer thereon, a plurality of flat regions each having a maximum height Rz of less than 1.0 μm as measured in accordance with JIS B 0601-2001 and a rough region having a maximum height Rz of 1.0 to 30.0 μm as measured in accordance with JIS B 0601-2001. The rough region has a pattern of lines that define the flat regions.