Patent ID: 7928560

Claim:
A composite multi-layer substrate comprising: a flat plate-like core member formed of a material having excellent electric conductivity, heat conductivity and high rigidity properties; a front side resin layer covering a front surface of said core member; a rear side resin layer covering a rear surface of said core member; a bottomless hole formed in said core member penetrating a front and rear of said core member; an electronic component mounted in said bottomless hole, the thickness of the electronic component after mounting in said bottomless hole at least does not cross the upper surface height position of said core member; a small hole formed in either one or both of said front side resin layer and said rear side resin layer located directly above or directly below the electronic component and extends in a vertical direction of the front surface and the rear surface of said core member; and an electrode formed on an interior portion of said small hole; wherein an electrical connection to the electronic component is provided via the electrode.