Patent ID: 8604350
Filing Date: 2013-12-10
Classification: H05K,Y10T

Abstract:
1. A multilayer wiring board comprising at least one insulating resin layer, a first wiring laid on a first surface of the insulating resin layer, a second wiring laid on a second surface of the insulating resin layer, and at least one via-hole conductor provided in a through-hole and configured to pierce the insulating resin layer for electrically connecting the first wiring and the second wiring, wherein: the via-hole conductor includes metal portion and resin portions, the resin portion forming a matrix in which the metal portions are embedded, the metal portion includes: the copper particles forming the joined unit are in plane contact with one another to form plane contact portions, the plane contact portions are at least partially covered by the second metal regions, and the second metal regions at least partially are in contact with the first metal regions, and the at least one via-hole conductor is sandwiched between the first and second wirings which at least partially cover the top end and bottom end of the through-hole.