PCB News - How multi-layer circuit boards define levels

Toppaste and bottompaste are the top bottom pad layer, which refers to the copper platinum that we can see exposed, (for example, we drew a wire on the top wiring layer, and this wire is what we see on the PCB board. What we got is just a line, it is covered by the whole green oil, but we draw a square or a point on the toppaset layer at the position of this line, the square and this point on the board that are printed out There is no green oil, but copper and platinum.

The two layers of topsolder and bottomsolder are just opposite to the previous two layers. It can be said that these two layers are the layers to be covered with green oil. Solder: solder paste: paste, paste mask: cover, film, surface layer, etc. Take the top layer as an example:

1. The full name of the solder layer in Protel 99SE is top solder mask, which means the solder mask layer. To understand it literally, it is to give a layer of green oil to the traces on the circuit board to achieve the purpose of solder mask. In fact, Otherwise, if you do not add a solder layer to the trace after routing, the green oil is added by default when the PCB board manufacturer is making it. If the solder layer is added, the PCB board will be added here after it is made. See the bare copper foil. Can be understood as a mirror phase.
2. The past layer is used when the stencil is made before the PCB board placement. It is used to apply solder paste. The electronic components of the patch are attached to the solder paste for reflow soldering. The difference between DrillGuide and DrillDrawing:
(1) DrillGuide is used for guided drilling, C8051 chip decryption, mainly used for manual drilling for positioning
(2) DrillDrawing is used to view the drill hole diameter. When drilling manually, these two files must be used together. But now most of them are CNC drilling, so these two layers are not very useful. When placing positioning holes, you don't need to place content on these two layers. Just put the via pads of the corresponding aperture on the Michanical or TOPLAYER or bottomlayer layer. You can only place the disk diameter smaller.
As for the two layers of Michanical and MultiLayer, they are like this:
(1) Michanical is a mechanical layer, used to place mechanical graphics, such as the shape of the PCB board, etc.
(2) MultiLayer can be called multi-layer (as I call it), the graphics placed on this layer have corresponding graphics on any layer, and the keepout layer that will not be screen printed on the solder resist is actually not used When drawing the shape of the PCB board, the real purpose of the keepout layer is to prohibit wiring, that is to say, after placing a graphic on the keepout layer, there will be no corresponding graphic copper in the corresponding position on the wiring layer (such as toplayer and bottomlayer) The foil appears and is all the wiring layers. This will not happen after placing graphics on the Michanical layer.

The mechanical layer defines the appearance of the entire PCB board. In fact, when we talk about the mechanical layer, we mean the overall appearance of the PCB board. The forbidden wiring layer is the temporary boundary of copper that defines the electrical characteristics of our wiring. That is to say, after we first define the forbidden wiring layer, in the future wiring process, the wiring with electrical characteristics cannot exceed the forbidden wiring. The boundary of the layer. Topoverlay and bottomoverlay are the silk screen characters that define the top and bottom, which are the component numbers and some characters that we generally see on the PCB board. Toppaste and bottompaste are the top bottom pad layer, which refers to the copper platinum that we can see exposed, (for example, we drew a wire on the top wiring layer, and this wire is what we see on the circuit board PCB. What we got is just a line, it is covered by the whole green oil, but we draw a square or a point on the toppaset layer at the position of this line, the square and this point on the board that are printed out There is no green oil, but copper platinum. The two layers of topsolder and bottomsolder are just opposite to the previous two layers. It can be said that these two layers are the layers to be covered with green oil. The multilaye layer is actually the same as the mechanical layer. The layers are almost there, as the name enyi, this layer refers to all the layers of the PCB board.