Patent ID: 9282628
Filing Date: 2016-03-08
CPC Classification: H01L,H05K,Y10T

Claim Text:
1. A component built-in board that has stacked therein a plurality of printed wiring bases in which a wiring pattern and a via are formed on/in an insulating base and that is configured having an electronic component built in thereto, wherein at least two layers of the plurality of printed wiring bases are disposed on a rear surface side which is an opposite side to an electrode formation surface side of the electronic component; the at least two layers of the printed wiring bases disposed on the rear surface side of the electronic component include a heat radiation-dedicated wiring pattern as the wiring pattern that is disposed in multiple layers via the insulating base on a region above the rear surface of the electronic component; the heat radiation-dedicated wiring pattern is formed such that a heat radiation-dedicated wiring line and a signal-dedicated wiring line are continuous; the via includes a plurality of heat radiation-dedicated vias that are disposed on the region above the rear surface to connect the rear surface of the electronic component and the heat radiation-dedicated wiring pattern disposed in multiple layers; and the heat radiation-dedicated wiring pattern is continuous from a place where connected to the heat radiation-dedicated via to be connected also to another via disposed at an outer peripheral side of the electronic component.