Patent ID: 6570099
Filing Date: 2003-05-27
Classification: H01L,H05K,Y10T

Abstract:
A thermal conductive substrate comprising:a first electrical insulator layer; a second electrical insulator layer; and a lead frame serving as a circuit pattern; wherein the first electrical insulator layer is formed of a thermal conductive resin composition comprising a thermosetting resin and an inorganic filler, and is joined to the lead frame, the second electrical insulator layer is provided on a side of the first electrical insulator layer not in contact with the lead frame, and is formed of a thermal conductive resin composition comprising the inorganic filler and a resin composition comprising the thermosetting resin, the second electrical insulator layer has a higher thermal conductivity than the first electrical insulator layer, and a portion of the lead frame is embedded in the first electrical insulator layer.