Solder mask refers to the part of the board that is to be greened; because it is the negative output, the actual effect of the part of the solder mask is not green, but tinned, silvery white!
Welding layerPaste mask, which is used when the machine is patched, is the pad corresponding to all the components of the patch. It is the same size as the toplayer/bottomlayer layer. It is used to open the steel mesh.
The two layers are all used for soldering. They do not refer to a tin and a green oil. Then, if there is a layer, it refers to the layer of green oil. If there is a layer on a certain area, it means this area. Is it insulated with green oil? I haven't seen such a layer yet! The PCB we painted, the pad on the top has a solder layer by default, so the pad on the PCB is made of silver. It’s not surprising that the white solder is not covered with green oil; however, the traces on the PCB board we draw are only the toplayer or bottomlayer layer, and there is no solder layer, but the traces on the PCB are made up. Layer green oil. It can be understood: 1, meaning that the solder resist layer on a green oil fenestration whole piece of solder in order to allow solder 2, by default, have no region of the solder resist layer 3 on the green oil,!! The paste mask layer is used for patch packaging! The SMT package uses: toplayer layer, topsolder layer, toppaste layer, and toplayer and toppaste are the same size, topsolder is bigger than them. DIP encapsulation only used: topsolder and multilayer layer (after some decomposition, I found that the multilayer layer is actually the toplayer, bottomlayer, topsolder, bottomslayer layer size overlap), and topsolder/bottomlayer is bigger than toplayer/bottomlayer. Doubt: "Is the correct copper layer in the copper layer to be tinned or gold plated?" This sentence is said by a person working in a PCB factory. What he meant is that he wants to make a picture. The effect produced in the part of the solder layer is tin plating, then the corresponding layer of the layer must have copper skin (ie: the area corresponding to the layer of the solder layer must have a part of the toplayer or bottomlayer layer)! Now: I have come to a conclusion: : "The corresponding copper layer of the solder layer is tinned or gold plated." This sentence is correct! The solder layer indicates the area that does not cover the green oil! mechanical, mechanical layer keepout layer prohibits the wiring layer top overlay top screen printing Layer bottom layer , top layer, bottom layer, bottom paste layer, top solder layer, bottom solder layer, solder guide layer , through hole guide layer, drill pattern, through hole drill layer, multilayer multilayerThe mechanical layer defines the appearance of the entire PCB. In fact, when we say the mechanical layer, it refers to the overall structure of the PCB. The banned wiring layer is the boundary when we define the copper characteristics of the electrical properties of the cloth. That is to say, after we have defined the banned wiring layer, we can not extend the wiring of the electrical characteristics in the future cloth. The boundary of the layer. Topoverlay and bottomoverlay are the silkscreen characters that define the top and bottom, which are the component numbers and some characters that we generally see on the PCB. Toppaste and bottompaste are the top layer of the underlying pad. It refers to the copper and platinum that we can see on the outside. (For example, we draw a wire on the top layer of the wiring. This wire is what we see on the PCB. Just a line, it is covered by the whole green oil, but we draw a square, or a point on the toppaste layer on the position of the line, the square on the board and the point is green. Oil, but copper and platinum. The two layers of top solder 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 layer of multilayer is actually similar to the mechanical layer. As the name suggests, this layer refers to all layers of the PCB board.
The two layers of top solder 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; because it is the negative output, the actual effect of the partial part of the solder mask is not The green oil is tinned and silvery white! 1 Signal layer The signal layer is mainly used to lay out the wires on the board. Protel 99 SE provides 32 signal layers, including Top layer, Bottom layer and 30 MidLayer. 2 Internal plane layer The Protel 99 SE provides 16 internal power/ground layers. This type of layer is used only for multi-layer boards and is mainly used to lay out power and ground lines. We call it a double layer. Board, four-layer board, six-layer board, generally refers to the number of signal layers and internal power/ground layers. 3 Mechanical layer The Protel 99 SE provides 16 mechanical layers that are typically used to set the board's form factor, data marks, alignment marks, assembly instructions, and other mechanical information. This information varies depending on the requirements of the design company or PCB manufacturer. Execute the menu command Design|MechanicalLayer to set up more mechanical layers for the board. In addition, the mechanical layer can be attached to other layers to output the display together. 4 Solder mask layer A layer of paint, such as solder mask, is applied to all parts of the pad to prevent tin on these areas. The solder mask is used to match the pads during the design process and is automatically generated. The Protel 99 SE offers two solder masks, Top Solder (top layer) and Bottom Solder (bottom layer). 5 Paste mask layer (SMD paste layer) It is similar to the solder mask layer, except for the pad of the surface-mount component corresponding to the machine soldering. Protel99 SE offers two solder paste layers, Top Paste (top layer) and Bottom Paste (bottom layer). Mainly for SMD components on the PCB. If the board is full of Dip components, this layer does not need to output Gerber files. Before the SMD components are attached to the PCB, the solder paste must be applied to each of the SMD pads. The paste mask file is required for the tinned steel mesh, and the film can be processed. The most important point of the Gerber output of the Paste Mask layer is to make it clear that this layer is mainly for SMD components, and compare this layer with the Solder Mask described above to clarify the different roles of the two, because from the film film These two film maps are very similar. 6 Keep out layer is used to define the area on the board where components and wiring can be placed efficiently. A closed area is drawn in this layer as the effective area of ​​the wiring, and it is not automatically laid out and routed outside the area. 7 Silkscreen layer The silkscreen layer is mainly used to place printed information, such as the outline and label of components, various annotation characters, and so on. The Protel 99 SE offers two silkscreen layers, Top Overlay and Bottom Overlay. Generally, the various dimension characters are on the top silkscreen layer, and the bottom silkscreen layer can be closed. 8 Multi-layer boards have pads and through-vias that penetrate the entire board and establish electrical connections to different conductive pattern layers, so the system has an abstract layer—multilayer. Generally, the pads and vias are placed on multiple layers. If this layer is turned off, the pads and vias cannot be displayed. 9 Drill layer The drilled layer provides drilling information during board manufacturing (such as pads and vias that require drilling). The Protel 99 SE offers two drilled layers, Drillgride (drilling indication) and Drill drawing. Solder mask and solder layer distinguish solder mask : solder mask, refers to the part of the board to be green oil; because it is the negative output, so the actual part of the powder mask is not green, and It is tin-plated and silver-white! The soldering layer: paste mask is used for the machine patch. It is the pad corresponding to all the chip components. It is the same size as the toplayer/bottomlayer layer. It is used to open the steel mesh. Used for tin. Key points: Both layers are used for soldering on the tin. It does not refer to a tin and a green oil. Then there is no layer that refers to the layer of green oil. As long as there is a layer on a certain area, it means this. The area is insulated with green oil? I haven't seen such a layer yet! The PCB board we painted has a solder layer by default, so the pad on the PCB board is made up. Silver-white solder, it is not surprising that there is no green oil; but the traces on the PCB board we draw are only the toplayer or bottomlayer layer, and there is no solder layer, but the traces on the PCB board are all on the line. A layer of green oil.That can be understood like this:
1. The solder mask means to open the window on the whole piece of solder resist green oil, the purpose is to allow welding!
2. By default, green oil is required in areas where there is no solder mask!
3, the paste mask layer is used for patch packaging! SMT package uses: top layer layer, top solder layer, top paste layer, and top layer and top paste are the same size, topsolder is bigger than them. DIP encapsulation is only used: topsolder and multilayer layer (after some decomposition, I found that the multilayer layer is actually the toplayer, bottomlayer, topsolder, bottomsolder layer size overlap), and topsolder/bottomsolder is bigger than toplayer/bottomlayer.
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