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How many layers does the PCB board have? do you know?
We have learned a lot about the knowledge of PCB, and today we will continue to expand the unknown field-how many layers of PCB board.
Generally speaking, there is no certain standard for the number of PCB layers, and it will be determined according to everyone's needs for PCB functions. Let's start with some conventional PCB layers. The conventional PCB board will be divided into six layers, namely the mechanical layer, the forbidden wiring layer, the solder mask layer, the soldering layer, the silk screen layer and the via layer.
The "green oil" layer on the PCB is what we call the solder mask, but even if it is green, it is because it is painted with green paint. It is actually tinned, but this color is not chosen for good-looking Woolen cloth.
The soldering layer is used for machine patching. It corresponds to the pads of all patch components. The size is the same as the top/bottom layer. It is used to open the stencil to leak tin.
The silk screen layer can also be subdivided into the top silk screen layer and the bottom silk screen layer.
The via layer is generally divided into a via guide layer and a via drilling layer.
How many layers does the PCB board have
With the rapid development of PCB circuit boards, the functions are becoming more and more diverse, and more and more PCB layers have emerged as the times require. If the definition and use of each layer cannot be clearly distinguished, the technical staff will make It is very easy to confuse the PCB. However, the knowledge system of the definition and purpose of each layer of the PCB circuit board is too large to be eager for success. Today, I will briefly introduce the definition of each layer. The next article will talk about the specific role of each layer in detail.
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