Patent ID: 11956898
Assignee: APPLE INC.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 13:
14. A printed circuit board, comprising: core layers, wherein the core layers include at least one core dielectric layer separating a first core conductive material layer proximate an upper vertical surface of the core layer and a second core conductive material layer proximate a lower vertical surface of the core layers; a plurality of build-up layers coupled to the core layer, wherein the build-up layers include at least one build-up dielectric layer and at least one build-up conductive material layer; a plurality of overlapping vias through at leat one of the build layers, wherein the plurality of overlapping vias form a trench that extends from a first horizontal position of a first via in the plurality of overlapping vias that is connected to the build-up layer vertically above the overlapping vias to a second horizontal position of a last via in the plurality of overlapping vias that is connected to the build-up layer vertically below the overlapping vias, the second horizontal position being horizontally displaced from the first horizontal position, wherein the trench has a first interface between the at least one of the build-up layers and the build-up layer vertically above the overlapping vias and a second interface between the at least one of the build-up layers and the build-up layer vertically below the overlapping vias, and wherein the trench has a flat profile at the first interface and at the second interface along its length between the first horizontal position and the second horizontal position; and a third conductive material filling the trench.