METALLIC BASE CIRCUIT BOARD

摘要

PROBLEM TO BE SOLVED: To provide a metallic base circuit board which has a superior heat radiating property and high electrical reliability. SOLUTION: A metallic base circuit board is constituted by laminating conductive foil 3 upon a metallic plate 1 through an insulating layer 2 and forming a circuit by etching the foil 3. The insulating layer has a multilayered structure and a total thickness of 50-90μm. In addition, the thickness of the surface layer of the insulating layer 2 which is in contact with the foil 3 is larger than the lengths of the legs of the foil 3 which are in contact with the insulating layer 2.