Patent ID: 11973003
Assignee: TOSHIBA MATERIALS CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  C | IPC H

Claim 0:
1. A ceramic metal circuit board formed by bonding metal circuit plates to at least one surface of a ceramic substrate, wherein at least one of the metal circuit plates has an area of not less than 100 mm2 and comprises a concave portion having a depth of not less than 0.02 mm within a range of 1% to 70% of a surface of the at least one of the metal circuit plates, and the concave portion is provided not less than 3 mm inside from an end of the at least one of the metal circuit plates, and
wherein a sectional shape of the concave portion is at least one shape selected from a triangular shape or a shape with a convex portion formed at an inlet edge of the concave portion.