Patent ID: 9578742
Date: 2017-02-21
CPC Classifications: H05K

Claim:
1. A circuit board structure, comprising: a first circuit layer; a first dielectric layer disposed on the first circuit layer, wherein the first dielectric layer has at least one first hole exposing a portion of the first circuit layer; a second dielectric layer disposed on the first circuit layer and the first dielectric layer, wherein the second dielectric layer has at least one trench and at least one second hole disposed in the first hole, the second hole exposing the first circuit layer, the trench exposing the first dielectric layer; a second circuit layer disposed in the trench; and a conductive via disposed in the second hole without contacting the first hole, wherein a diameter of the second hole is smaller than a diameter of the first hole, and the conductive via has a bottom surface, a top surface, and a side surface connecting the bottom surface and the top surface.