What are the ways of PCB circuit board guide hole?

Although PCBs are widely used, for novice PCB practitioners, many may not know how connectivity is achieved between each layer of the PCB. Here involves an industry term called a pilot hole, that is, through the drilling of holes to connect the different circuit layers to achieve the purpose of the conductive, and is therefore known as the PCB circuit board pilot hole. In order to achieve conductivity, the surface of the drilled holes is usually plated with a layer of a conductive substance, the commonly used conductive substance being copper.2 oz copper thickness in mm It is through this process that electrons are able to move between the different layers of copper foil.

So, what are the ways of PCB circuit board conduction holes?

First, through-hole. Through-hole is a common way to guide through the hole. Through the PCB straight to the light, you can see the bright hole is through-hole. This is a relatively simple way of PCB proofing holes, the production process using a drill or laser directly to the circuit board is fully drilled. Through-hole cost is relatively low, but usually takes up some of the PCB space.

Second, blind holes. Blind holes are a way to connect the outermost circuit of the PCB to the neighboring inner layer through plated holes. Since the opposite side cannot be seen, it is called a blind hole. In order to improve the space utilization of the PCB circuit layer, the blind hole process is used. It should be noted that this production method requires special attention to drill holes at just the right depth.plated through hole vs via It is possible to drill holes beforehand when individual circuit layers, and then finally glued, but this requires precise positioning and alignment devices.

Third, buried holes. Embedded holes are used to connect any circuit layer inside the PCB but do not lead to the outer layer of the process. This process can not be used after the bonding of drilled holes to achieve, must be implemented in the individual circuit layer when drilling. The inner layer is first partially bonded, then plated and finally fully bonded. Compared to through-hole and blind-hole methods, buried holes are more labor-intensive and therefore more expensive. This process is usually used only for high-density circuit boards to increase the space available for other circuit layers.

With the development of electronic products in the direction of "light, thin, short and small", PCBs are also developing in the direction of high density and high difficulty. As a result, a large number of SMT, BGA and other types of PCBs have appeared, and customers require hole plugging when mounting components, so why is it necessary to plug holes in PCB circuit board guide holes? In order to meet customer demand and timely response, after a lot of practice, we have changed the traditional aluminum plug hole process, using white mesh to complete the circuit board board surface solder resist and plug holes. This production is more stable and the quality is more guaranteed.