Patent ID: 8916782

Claim:
A multi-layered circuit board comprising: a first insulation layer having a first surface, a second surface opposite to the first surface, and at least one through hole; a patterned conductive layer located on the first surface, at least one portion of the patterned conductive layer surrounding the through hole; an electro-static releasing layer located on the second surface and electrically insulated from the patterned conductive layer, at least one portion of the electro-static releasing layer being located around the through hole; a second insulation layer located below the first insulation layer, such that the electro-static releasing layer is sandwiched between the first insulation layer and the second insulation layer; a power supply layer located below the second insulation layer, the power supply layer and the electro-static releasing layer being respectively located at two opposite sides of the second insulation layer; and a third insulation layer located below the second insulation layer, such that the power supply layer is sandwiched between the second insulation layer and the third insulation layer, wherein the through hole is formed in the second insulation layer, the power supply layer, and the third insulation layer, and there is no conductive material within the through hole.