Patent ID: 8453322

Claim:
A method of manufacturing at least a portion of a printed circuit board, the method comprising: attaching a plurality of sub-assemblies with each other after processing at least one of the plurality of sub-assemblies, wherein each of the plurality of sub-assemblies comprises a plurality of circuit layers, and the processing of the at least one of the plurality of sub-assemblies comprises: forming at least one hole having a first diameter and a first depth from a first side of the at least one of the plurality of sub-assemblies and into the at least one of the plurality of sub-assemblies; forming at least one countersink having a second diameter larger than the first diameter and a second depth shorter than the first depth from the first side of the at least one of the plurality of sub-assemblies and into the at least one of the plurality of sub-assemblies at the at least one hole; metalizing the at least one hole and the at least one countersink to metalize the at least one hole and the at least one countersink; applying a lamination adhesive layer on the first side of the at least one of the plurality of sub-assemblies; applying a protective film on the lamination adhesive layer; forming at least one via into the lamination adhesive layer to expose a metalized portion of the at least one countersink; filling at least one conductive paste into the at least one via formed in the lamination adhesive layer; and removing the protective film to expose the lamination adhesive layer on the at least one of the plurality of sub-assemblies for attachment with the other plurality of sub-assemblies.