source:Industry News release time:2022-04-11 Article author:sznbone Popular:pcb
Blind Hole: Blind Via Hole (BVH)
The outermost circuit of the PCB is connected to the adjacent inner layer by plated holes. Because the opposite side cannot be seen, it is called "blind hole". In order to increase the space utilization of the PCB circuit layer, the "blind via" process came into being.
Blind holes are located on the top and bottom surfaces of the circuit board, with a certain depth, and are used for the connection of the surface circuit with the inner circuit below. The depth of the hole generally has a specified ratio (diameter). This kind of production method requires special attention. The drilling depth must be just right. If you don't pay attention, it will cause difficulties in electroplating in the hole. Therefore, very few factories will adopt this production method. In fact, it is also possible to drill holes for the circuit layers that need to be connected in advance in the individual circuit layers, and then glue them together at the end, but it requires a more precise positioning and alignment device.
Buried Via: Buried Via Hole (BVH)
A buried hole is a connection between any circuit layers inside a printed circuit board (PCB), but it is not connected to the outer layer, that is, it does not mean a via hole extending to the surface of the circuit board.
This manufacturing process cannot be achieved by bonding the circuit boards and then drilling. The drilling operation must be performed at the individual circuit layers, and the inner layer is partially bonded first, then electroplating, and finally all bonding. Since the operation process is more laborious than the original via and blind vias, the price is also the most expensive. This fabrication process is usually only used for high-density circuit boards, increasing the space utilization of other circuit layers.
After we draw the PCB, we send it to the PCB board factory for proofing or mass production. When we place an order for the board factory, we will attach a PCB processing process description document, one of which is to indicate which one to choose. PCB surface treatment process, and different PCB surface treatment processes will have a greater impact on the final PCB processing quotation. Different PCB surface treatment processes will have different charges. Let’s popularize some terms about PCB surface treatment process below. .
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