Patent ID: 9474166
Filing Date: 2016-10-18
CPC Classification: H01L,H05K,Y10T

Claim Text:
1. A printed circuit board comprising a printed wiring board, wherein the printed wiring board comprises a first surface layer on which an electronic component is mounted, wherein a heat transfer pattern is formed in an area of the first surface on which the electronic component is mounted, a second surface layer positioned on a side of the printed wiring board, opposite to the first surface layer, wherein a first conductive pattern is formed in an area of the second surface, and a through hole penetrating the printed wiring board in a thickness direction thereof, wherein the through hole is formed in the area in which the heat transfer pattern is formed, a through hole conductor is formed within the through hole, and the through hole conductor is thermally connected to the heat transfer pattern and the first conductive pattern; an electronic component having a heat sink mounted on the first surface layer of the printed wiring board; and a solder joint portion arranged between the heat sink of the electronic component and the heat transfer pattern of the printed wiring board, wherein the heat transfer pattern is covered with a solder resist, and is exposed from the solder resist to form a plurality of connecting lands, wherein the plurality of connecting lands comprises a first land group including a plurality of first lands, and a second land group including a plurality of second lands, each of the first lands is arranged adjacent to the through hole, and the each of the second lands is not arranged adjacent to the through hole, and wherein at least one of the first lands is not connected through the solder joint portion to the heat sink, the second lands are connected through the solder joint portion to the heat sink, the solder is solidified within the at least one of the through holes.