Patent ID: 7615708

Claim:
An arrangement of non-signal through vias, suitable for a wiring board, wherein the wiring board has a contact surface, a core layer and a plurality of contact pads disposed on the contact surface, the arrangement comprising: a plurality of first non-signal through vias, passing through the core layer and electrically connected to at least one of the contact pads; and a second non-signal through via, passing through the core layer, disposed between the first non-signal through vias, and not electrically connected to the contact pads, wherein each of the first non-signal through vias and the second non-signal through via comprises a dielectric column and a conductive layer wrapping around the dielectric column, and the interval between the second non-signal through via and anyone of the surrounding first non-signal through vias is smaller than or equal to 0.72 times of the minimum interval between any two of the contact pads electrically connected to the corresponding first non-signal through vias.