Third, the printed circuit board includes many types of working layers, such as signal layer, protective layer, silk screen layer, internal layer, etc. The functions of each layer are briefly introduced as follows:
(1) Signal Layer: Mainly used to place components or wiring. Protel DXP usually contains 30 middle layers, namely Mid Layer1~Mid Layer30. The middle layer is used to arrange signal lines, and the top and bottom layers are used to place components or deposit copper.
(2) Protective Layer: It is mainly used to ensure that the parts of the circuit board that do not need to be tinned are not tinned, so as to ensure the reliability of the operation of the circuit board.
Among them, Top Paste and Bottom Paste are the top solder mask and the bottom solder mask respectively.
Top Solder and Bottom Solder are the solder paste protection layer and the bottom solder paste protection layer, respectively.
(3) Silk Screen Layer: Mainly used to print the serial number, production number, company name of the components on the printed circuit board.
(4) Internal Layer: Mainly used as a signal wiring layer. Protel DXP contains 16 internal layers.
(5) Other layers: mainly include 4 types of layers.
Drill Guide (drilling azimuth layer): Mainly used for the position of drilling holes on the printed circuit board.
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