Printed Circuit Board | Plating Through Hole, Blind hole, Buried hole
Printed circuit board is made up of layers of copper foil circuits, and the connections between different circuit layers rely on these "vias". This is because today's circuit board manufacturing uses drilled holes to connect different circuits. Between the circuit layers, it is similar to the connection channel of the multi-layer underground waterway. Friends who have played the "Brother Mary" video game may be aware of the connection of water pipes. The difference is that water pipes are required to allow water to circulate ( It’s not to be drilled for Brother Mary), and the purpose of the circuit board connection is to conduct electricity for electrical characteristics, so it is called a via hole, but if you only use a drill or a laser to drill the hole, it will not conduct electricity. Therefore, a layer of conductive material (usually "copper") must be electroplated on the surface of the drilled hole, so that electrons can move between different copper foil layers, because the surface of the original drilled hole is only the resin that does not conduct electricity of.
Through hole: Plating Through Hole referred to as PTH
This is the most common type of via hole. You only need to pick up the PCB and face the light, the hole that can see the bright light is the "through hole". This is also the simplest type of hole, because when making it, you only need to use a drill or a laser to directly drill the circuit board, and the cost is relatively cheap. But on the other hand, some circuit layers do not need to connect these through holes. For example, we have a six-story house. The working bear has a lot of money. I bought its third and fourth floors. Then, the working bear himself is on the third floor. A staircase is designed between the fourth floor to communicate with each other, and the working bear does not need to connect to other floors. At this time, if another staircase is designed to pass through each floor from the first to the sixth floor, it will be wasted. With the current circuit board Inch gold should not be allowed. So although through holes are cheap, they sometimes use up more PCB space.
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