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

Claim 5:
6. The circuit board structure according to claim 5, further comprising:
a first joint portion and a second joint portion disposed on the first inner circuit layer, wherein the first annular retaining wall surrounds the first joint portion and the second joint portion, and the first joint portion corresponds to the first conductive through hole; and
a third joint portion and a fourth joint portion disposed on the second inner circuit layer, wherein the second annular retaining wall surrounds the third joint portion and the fourth joint portion, and the third joint portion corresponds to the second conductive through hole;
wherein the first inner circuit layer comprises a first signal circuit and a first ground circuit, the first annular retaining wall is disposed on the first ground circuit, and the first joint portion and the second joint portion are disposed on the first signal circuit, the second inner circuit layer comprises a second signal circuit and a second ground circuit, the second annular retaining wall is disposed on the second ground circuit, and the third joint portion and the fourth joint portion are disposed on the second signal circuit.