Patent ID: 7626270

Claim:
A conductive structure of a coreless package substrate, comprising: a dielectric layer having a plurality of first openings and second openings therein, outward to the opposing sides of the dielectric layer, wherein the second openings correspond to and are smaller than the first openings each; a first metal layer formed in each of the first openings as a conductive pad, wherein the thickness of the first metal layer is smaller than the depth of the first opening, therewith the first metal layer contacting the second opening; a second metal layer formed in each of the second openings as a conductive via, filling up the second opening and contacting the first metal layer in the first opening; and a solder mask formed on the dielectric layer and the first metal layer, having a plurality of openings formed therein, wherein the openings of the solder mask correspond to and are smaller than the first openings each.