label: PCB board layer,Printed-circuit board,PCB board
The introduction of each PCB board layer when Protel99 production
When the production of PCB board layers Protel99 meaning Introduction: the top wiring layer, the bottom wiring layer: alignment with electrical characteristics . That connect the various components on the circuit board pin connection. Mechanical layer : define the external appearance of the PCB board .
The top wiring layer, the bottom wiring layer: alignment with electrical characteristics . That connect the various components on the circuit board pin connection.
Mechanical layer: Defines the appearance of the PCB board, in fact, we are talking about when the mechanical layer PCB board refers to the shape of the entire structure.
Prohibit wiring layer: copper boundary is defined when the electrical characteristics of the cloth, that is, we define the first wiring layer is prohibited, after the wiring process, the electrical characteristics of the wire cloth having a wiring layer can not exceed prohibition boundary.
Top Silk bottom silkscreen layer: Defines the top and bottom of the screen characters , is generally what we see on the PCB part numbers and some characters.
The top pad layer, the bottom layer of the pad: pad the top and bottom layer, which means we can see the pad SMD components.
The top of the solder layer, the bottom solder layer: PCB board is due to default on the green oil, with the two layers where it will draw the line open "Window" , not on the green oil. You can use a large current flow in some places need to additionally solder.
Multi- molecular layer and mechanical layer actually almost , by definition, refers to the layer of all layers of the PCB .
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