Patent ID: 9307642
Filing Date: 2016-04-05
CPC Classification: H05K,Y10T

Claim Text:
1. A printed board comprising: a first conductor layer; a second conductor layer provided to a layer different from the first conductor layer; an insulation layer provided between the first conductor layer and the second conductor layer; a plurality of through holes that pass through the first conductor layer, the second conductor layer, and the insulation layer; and a plurality of vias that are formed in the plurality of through holes, respectively, and couple the first conductor layer and the second conductor layer, each of the plurality of vias including a conductor portion that occupies part of an internal space of the through hole, and a non-conductor portion that occupies remaining part of the internal space, wherein the conductor portion has a spiral shape; wherein the spiral shape of the conductor portion is formed by twisting a core material with a core width corresponding to a diameter of one of the plurality of vias and a core thickness smaller than the core width.