Patent ID: 7378602

Claim:
A multilayer core board comprising: a center insulating layer having a first surface and a second surface; a ground layer formed over the first surface of the center insulating layer and having a plurality of conductive portions and a plurality of non-conductive portions; a power source layer formed over the second surface of the center insulating layer and having a plurality of conductive portions and a plurality of non-conductive portions; a first insulating layer provided between over the ground layer; a first conductive layer disposed over the first insulating layer; a second insulating layer provided over the power source layer a second conductive layer disposed over the second insulating layer; a plurality of first via hole conductors tapering and passing from the first conductive layer through the first insulating layer, the non-conductive portions of the ground layer and the center insulating layer and reaching the conductive portions of the power source layer respectively; a plurality of second via hole conductors passing from the second conductive layer through the second insulating layer and reaching the conductive portions of the power source layer, respectively; a plurality of third via hole conductors tapering and passing from the second conductive layer through the second insulating layer, the non-conductive portions of the power source layer and the center insulating layer and reaching the conductive portions of the ground layer, respectively; and a plurality of fourth via hole conductors passing from the first conductive layer through the first insulating layer and reaching the conductive portions of the ground layer, respectively, wherein the first via hole conductors and the fourth via hole conductors are alternately juxtaposed with one another, the second via hole conductors and the third via hole conductors are alternately juxtaposed with one another, the first via hole conductors and third via hole conductors are alternately juxtaposed with one another in the center insulating layer, the first via hole conductors, the second via hole conductors and the conductive portions of the power source layer comprise a plurality of through hole conductors on a positive pole side, and the third via hole conductors, the fourth via hole conductors and the conductive portions of the ground layer comprise a plurality of through hole conductors on a negative pole side.