source:Industry News release time:2021-10-20 Article author:sznbone Popular:pcb
Introduction to the meaning of each layer in PCB proofing
1. Mechanical layer
The mechanical layer is usually used to place marking information about the manufacturing and assembly methods of the circuit board, such as PCB size, size marking, data material, information, assembly instructions and other information.
2. No wiring layer
is used to define the area where components and wiring can be placed on the PCB circuit board. If a closed area is drawn on this layer as a routing area, automatic placement and routing cannot be performed outside the area.
Three, silk screen layer
The silk screen layer is the text layer belonging to the upper layer of the PCB and is often used as an annotation.
1. Top silk screen layer
In PCB design, the top silk screen layer is used to display the projected overview of the component, component label, nominal value or model number, and various annotation texts.
2. The bottom silk screen layer
Same as the top silk screen layer, once you include all the marks on the top silk screen layer, you can turn off the bottom silk screen layer.
Four, solder mask
The solder mask refers to the part painted on the printed circuit board. In fact, this pcb solder mask uses a negative output, so after the shape of the solder mask is mapped to the board, the copper skin is exposed instead of the green solder mask.
Five, multiple layers
The pads and vias on the PCB circuit board must penetrate the entire circuit board and establish electrical connections with other conductive pattern layers. Therefore, the system has established a special abstract layer-multi-layer. In general, the pads and vias should be arranged in multiple layers. When this layer is closed, the pads and vias are invisible.
6. Drilling layer
The drilling layer provides drilling information (for example, pads and through holes that need to be drilled) during the manufacturing process of the PCB circuit board.
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