Patent ID: 9648733
Date: 2017-05-09
CPC Classifications: H05K,Y10T

Claim:
1. A multilayer substrate core structure including: a starting insulating layer having a first side with a first planar surface and an opposite second side with a second planar surface; a first patterned conductive layer on the first planar surface of the first side of the starting insulating layer, and a second patterned conductive layer on the second planar surface of the second side of the starting insulating layer; a first supplemental insulating layer on the first patterned conductive layer and on the first planar surface of the first side of the starting insulating layer; a second supplemental insulating layer on the second patterned conductive layer and on the second planar surface of the second side of the starting insulating layer; a first supplemental patterned conductive layer on the first supplemental insulating layer; a second supplemental patterned conductive layer on the second supplemental insulating layer; and a set of conductive vias provided in corresponding via openings extending from the second supplemental patterned conductive layer to the first supplemental patterned conductive layer, the via openings further extending through the first patterned conductive layer and the second patterned conductive layer, the via openings having a conical configuration providing a wider opening in the first patterned conductive layer than in the second patterned conductive layer, wherein at least one conductive via of the set of conductive vias is in electrical contact with the first and second supplemental patterned conductive layers and with the first and second patterned conductive layers, and wherein the at least one conductive via completely fills the corresponding via opening and has the conical configuration.