Patent ID: 7969740

Claim:
A metal-based print board formed with radiators, comprising: a thermally conductive metal plate having a prescribed plate thickness; a metallic foil affixed to a first surface of the metal plate with an adhesive layer interposed therebetween; and a radiator integrally formed on a second surface of the metal plate that is on an opposite side of the first surface, wherein the radiator has a plurality of tabular radiating fins, formed upright on the second surface of the metal plate at prescribed intervals by using an excavating tool to dig into the second surface; each of the radiating fins gradually decreases in thickness from a base end portion connected to the second surface towards a distal end, and curves from the base end portion to the distal end; a spacing between adjacent radiating fins gradually increases from the base end portion towards the distal end; and the metal plate is configured so that a thickness is smaller in a first metal plate portion between each of the radiating fins of the radiator than in a second metal plate portion of the metal plate excluding the radiator.