Patent ID: 8598463

Claim:
A circuit board, comprising: at least one metal pattern layer; a thermally conductive plate, having a plane; at least one electrically insulation layer, disposed between the metal pattern layer and the plane and partially covering the plane; and at least one electrically insulating material, covering the plane without covered by the electrically insulating layer, and contacting with the thermally conductive plate, wherein the electrically insulation layer exposes the electrically insulating material, and the side surface of the electrically insulating material contact the side surface of the electrically insulting layer, wherein thermal conductivity of the electrically insulating material is larger than a thermal conductivity of the electrically insulating layer, wherein both the electrically insulation layer and the electrically insulating material are disposed between the circuit layer and the plane, wherein the height of the electrically insulation layer is equal to the height of the electrically insulating material, wherein both the electrically insulating layer and the electrically insulating material cover the plane entirely.