Patent ID: 8759686

Claim:
A printed circuit board, comprising: an insulated base sheet; a heat-conducting layer disposed on the insulated base sheet; an insulated layer partially coated on the heat-conducting layer, leaving a plurality of exposed zones remaining thereon, wherein the exposed zones are separated from each other, each of the exposed zones is circular, and all of the exposed zones have the same radius; a plurality of heat-conducting blocks correspondingly formed on the exposed zones, each of the heat-conducting blocks extending out of the insulated layer and comprising a spherical top portion, each of the heat-conducting blocks being separated from each other; and a plurality of bonding pads positioned on the heat-conducting layer for soldering circuit elements, wherein the heat-conducting blocks are positioned in empty areas of the insulated layer adjacent to the bonding pads, and distributed in the spaces between every two adjacent bonding pads.