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Circuit boards include many types of working surfaces
08 Jan,2025
The 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:
⑴ Signal layer: mainly used to place components or wiring. Protel DXP typically consists of 30 intermediate layers, namely Mid Layer 1 to Mid Layer 30. The intermediate layer is used to arrange signal lines, while the top and bottom layers are used to place components or copper plating.
⑵ Protective layer: mainly used to ensure that areas on the circuit board that do not require tin plating are not tinned, thereby ensuring the reliability of the circuit board operation. Top Paste and Bottom Paste refer to the top solder mask layer and the bottom solder mask layer, respectively; The Top Solder and Bottom Solder are respectively the solder paste protective layer and the bottom solder paste protective layer.
⑶ Silk screen layer: mainly used to print the serial number, production number, company name, etc. of the components on the circuit board.
⑷ Internal layer: mainly used as a signal wiring layer, Protel DXP contains a total of 16 internal layers.
Other layers: mainly including four types of layers.
Drill Guide: mainly used for drilling positions on printed circuit boards.
Keep Out Layer: Mainly used to draw the electrical borders of circuit boards.
Drill Drawing: Mainly used to set the shape of drill holes.
Multi Layer: Mainly used to set multiple layers.
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