Patent ID: 11895773
Assignee: UNIMICRON TECHNOLOGY CORP.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 10:
11. The circuit board structure according to claim 5, wherein
the first conductive through hole comprises a first via, a first conductive material layer, and a first hole-filling material, the first via penetrates through the first dielectric layer, and the first conductive material layer covers an inner wall of the first via and connects the first external circuit layer and the first inner circuit layer electrically, the first hole-filling material fills the first via, and the first inner circuit layer and the first external circuit layer respectively cover a first upper surface and an opposing first lower surface of the first hole-filling material; and
the second conductive through hole comprises a second via, a second conductive material layer, and a second hole-filling material, the second via penetrates through the second dielectric layer, and the second conductive material layer covers an inner wall of the second via and connects the second external circuit layer and the second inner circuit layer electrically, the second hole-filling material fills the second via, and the second inner circuit layer and the second external circuit layer respectively cover a second upper surface and an opposing second lower surface of the second hole-filling material.