What is a buried hole?-深圳市海博精密电路有限公司

Buried hole is a type of through-hole that exists in blind buried hole plates, which is a through-hole between the inner layers. After the lamination process, it cannot be seen in the blind buried hole PCB, and it does not occupy the outer layer area. Both sides of the buried hole are in the inner layer of the circuit board. Taking the 6-layer blind buried hole PCB as an example, the through holes in L2-L3, L2-L4, L2-L5, L3-L4, L3-L5, and L4-L5 are all buried holes, which means they are buried inside the board, so they are called buried holes. This type of PCB is also called buried hole PCB or buried hole PCB.

Buried hole PCBs have a more complex manufacturing process than traditional multi-layer PCBs, so from the perspective of PCB manufacturers, the cost will be higher. Traditional multi-layer PCBs require drilling holes after lamination, while buried hole PCBs require drilling holes in the inner layer before lamination. Drilling needs to be completed in specific inner layers. First, press the specific inner layers together, then drill and electroplate, and finally perform complete pressing to form a complete PCB.

Due to the fact that this operation process requires more time and cost than board through holes and blind holes, it is the most expensive for printed circuit board manufacturers. This process can increase the space utilization of other circuit layers and is typically used for high-precision PCB manufacturing.

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