Systems and methods of manufacturing printed circuit boards using blind and internal micro vias to couple subassemblies
View Patent ↗Systems and methods of manufacturing printed circuit boards using blind and internal micro vias to couple subassemblies. An embodiment of the invention provides a method of manufacturing a printed circuit including attaching a plurality of metal layer carriers to form a first subassembly including at least one copper foil pad on a first surface, applying an encapsulation material onto the first surface of the first subassembly, curing the encapsulation material and the first subassembly; applying a lamination adhesive to a surface of the cured encapsulation material, forming at least one via in the lamination adhesive and the cured encapsulation material to expose the at least one copper foil pad, attaching a plurality of metal layer carriers to form a second subassembly, and attaching the first subassembly and the second subassembly.
1. An attachment structure for coupling subassemblies of a multi-layer printed circuit board, the structure comprising:
a first assembly comprising:
a first metal layer carrier,
a first capture pad positioned over a top surface of the first metal layer carrier,
a first encapsulating layer comprising a first blind via positioned over the first capture pad,
a second capture pad disposed over the first encapsulating layer;
a first laminate adhesive layer positioned over the first encapsulating layer and the second capture pad;
a first via substantially filled with a conductive material and positioned in the first laminate adhesive layer, the first via in contact with the first capture pad; and
a second assembly comprising:
a second metal layer carrier,
a third capture pad positioned over a bottom surface of the second metal layer carrier, and
a second encapsulating layer comprising a second blind via positioned over a bottom surface of the third capture pad,
a fourth capture pad disposed over a bottom surface of the second encapsulating layer,
wherein the second capture pad of the first assembly is engaged to the fourth capture pad of the second assembly by the first via, wherein the first via is disposed within the first laminate adhesive layer such that the first via in the first laminate adhesive layer is substantially aligned with the fourth capture pad of the second blind via,
wherein the first lamination adhesive layer is substantially uniform.
2. The structure of claim 1 , wherein the first blind via and the second blind via comprise copper.
3. The structure of claim 2 , wherein the first blind via and the second blind via are substantially filled with copper.
4. The structure of claim 1 , wherein the conductive material comprises one or more metals.
5. The structure of claim 4 , wherein the conductive material comprises a material selected from the group comprising copper and tin.
6. The structure of claim 1 , wherein the first via comprises a conductive paste.
7. The structure of claim 1 , wherein a thickness of the first via in the first laminate adhesive layer is about 3 to 5 mils.
8. The structure of claim 1 , wherein each of the first metal layer carrier and the second metal layer carrier comprises an insulating material.