Patent ID: 9629241
Date: 2017-04-18
CPC Classifications: H05K,Y02P

Claim:
1. A printed circuit board, comprising: a substrate, the substrate including a plurality of insulating layers stacked and a plurality of circuit layers disposed between adjacent insulating layers in a stacking direction, the substrate including a first surface and a second surface located on an opposite side to the first surface; a plurality of pads, disposed in a matrix on the first surface of the substrate; and a plurality of via holes, each disposed corresponding to each pad and running through the substrate and the corresponding pad, wherein an inner wall of a corresponding via hole has a conductive layer adhered thereon, at least one of the plurality of pads is electrically connected to a corresponding circuit layer in the substrate by the conductive layer on the inner wall of the corresponding via hole, the via hole comprises a first portion filled with a resin material and a second portion not filled with the resin material, and the first portion filled with the resin material is disposed closer to the second surface of the substrate than the second portion not filled with the resin material.