Introduction to board layers in PCB Board copying

 Let me briefly explain to you, generally PCB Board copyingThe layer and role used in the process. (The following colors are default and can be modified by yourself)

2. Toplayer (top layer) draws red lines, that is, the upper layer of the double panel.
4. The bottom layer is blue, that is, the line layer on the single panel.
6. Midlayer1 (Middle Layer 1) This is the first layer of the middle layer, it seems that there are 30 layers, the general designers do not use it, you do not care about him, multi-Panel use. It is not displayed in 99se by default. And cannot be used.
8. Mechanical
   Layers (mechanical layer) (purple) is used to mark the size, board description, inPCB Board copyingIt is ignored during processing, that is, it cannot be seen when the board is made. The meaning of simple point comment.
10. Top
    Overlay (top-layer Silk Screen Layer) (yellow) is the character on the front of the board, corresponding to the toplayer (top-layer) single panel will use this layer of characters, bottom
    Overlay (bottom layer silk screen) (brown) corresponds to bottomlayer (bottom layer) is the character on the back of the board, two or more layers of characters are used for dual panel.
12. Keepoutlayer (disallow wiring layer) (the red color is the same as the mechanical layer) is simply the frame and shape of the Board.
14. Multi
    Layer (multi-layer) (silver) All wiring layers are included. Generally, single-and double-sided plug-in pad is on this layer, and the lines are painted on all layers.

    1. toplayer (top layer) top layer wiring layer, used to draw electrical connection lines between components.
    2. bottomlayer: The underlying cabling layer.
    3. The midlayer1 (Middle Layer 1) is used to draw electrical connections for the multi-layer laminate. However, the cost of the multi-layer laminate is relatively high.
    4, mechanical
    Layers (mechanical layer) can be used to draw the shape of the PCB printing board, as well as the part requiring hole digging, and can also be used to annotate the PCB size. It can be used to draw the shape of the PCB printing board and the part requiring hole digging. Note:
    PCB shape. Do not use the same mechanical layer as the annotation size of the blank part and PCB. For example, mechanical Layer 1 is used to draw the PCB shape and hollowing, and mechanical layer 13 is used to annotate the size, technical staff of printed board manufacturers after separation
    The personnel will analyze whether or not to make the layer based on the content of this layer.
    5, top
    Overlay (top-layer Silk Screen Layer) (yellow) is the character on the front of the board, corresponding to the toplayer (top-layer) single panel will use this layer of characters, bottom
    Overlay (bottom layer silk screen) (brown) corresponds to bottomlayer (bottom layer) is the character on the back of the board, two or more layers of characters are used for dual panel.
    6. The keepoutlayer function is to draw a prohibited wiring area. If no mechanical layer is drawn in the printed board, the printed board manufacturer uses this layer as the PCB shape. For example, keepout
    When both the layer and the mechanical layer are available, the mechanical layer is used as the PCB shape by default, but the technicians of the printed board manufacturers will distinguish them by themselves, however, if they cannot be distinguished, they will use the mechanical layer as the shape layer by default.
    7, multi
    Layer (multi-layer) (silver) All wiring layers are included. Generally, single-and double-sided plug-in pad is on this layer, and the lines are painted on all layers.

I. Signal layers (signal layer)
Protel98 and protel99 provide 16 signal layers: Top (top layer), bottom (bottom layer), and Mid1-Mid14 (14 middle layers ).
The signal layer is the wiring layer used to complete the copper strip of printed circuit boards. When designing a dual-panel, only the top and bottom layers of bottom are generally used. When the number of layers of the printed circuit board exceeds four layers, the mid layer is used ).
2. Internal planes (internal power supply/ground connecting)
Protel98 and protel99 provide Plane1-Plane4 (4 internal power supplies/ ). The internal power supply/ground layer is mainly used for printed circuit boards with four or more layers as the dedicated wiring layers for power supply and grounding. The dual-Panel does not need to be used.
Iii. Mechanical Layers)
The mechanical layer is generally used to draw the border (Border) of the printed circuit board. Generally, only one mechanical layer is needed. Has Mech1-Mech4 (4 mechanical layers ).
Iv. drkll Layers)
There are two layers: "Drill drawing" and "drill guide ". It is used to plot the positioning of the hole diameter and hole.
V. Solder Mask (Solder Mask)
There are two layers: top layer and bottom layer ). When drawn on the solder mask, the pad on the printed circuit board and the protection area around the pass hole.
Vi. paste mask (Solder Paste protection layer)
There are two layers: top layer and bottom layer ). The solder paste protection layer is mainly used for printed circuit boards with surface components. At this time, the installation process of the table post components is required. This layer is not required when no table post components are required.
7. silkscreen)
There are two layers: top layer and bottom layer ). The silk screen Screen Layer is mainly used to draw text instructions and graphical instructions, such as the Shape Contour, labels and parameters of components.
8. Other (other Layer)
There are eight layers: "Keep Out (wiring prohibited layer)" and "multi
Layer (multi-layer, all layers of PCB), connect (connection layer), DRC error (error layer), and 2 visible
Grid (visible grid layer), pad holes (PAD hole layer), and
Holes (through hole layer )". Some of these layers are used by the system, such as visible
A grid (visual grid layer) is designed to facilitate positioning during plotting. While keep
Put (do not use the cabling layer) is used for automatic cabling and is not required for manual cabling.
Top layers (top copper foil wiring), bottom layers (bottom copper foil wiring), and top
Silkscreen (top layer lead layer ). You can select a preferred color for each layer. Generally, the top layer is red, the bottom layer is blue, the text and symbols are green or white, and the pad and the overpasses are yellow.

 

Toplayer and bottomlayer: both the top layer and the bottom layer, that is, the upper and lower layers of the circuit board. Generally, the signal lines are arranged on the top, such as dual-layer boards. For multi-layer boards, you can also add signal layer cabling in the middle.

Mechanical mechanical layer: defines the appearance of the entire PCB, that is, the shape structure of the entire PCB.

Keepoutlayer
Prohibited wiring layer: defines the boundary on the copper side of the electrical distribution. That is to say, after the prohibited cabling layer is defined, the wiring with electrical characteristics of the layout cannot go beyond the boundary of the prohibited cabling layer in the future deployment process.

Top-Layer Screen Printing layer of topoverlay
Bottomoverlay bottom-layer silk screen printing layer: defines the top-layer and bottom-layer silk screen characters, which are the component numbers and some characters that are generally seen on the PCB.

Toppaste top Pad Layer

Bottompaste bottom Pad Layer: the copper and platinum exposed to the outside.

Topsolder top-layer Solder Mask

Bottomsolder bottom-layer Solder Mask: In contrast to the two layers of toppaste and bottompaste, bottomsolder is a green layer.
 
Drillguide through-hole guide Layer

Drilldrawing over-hole drilling Layer

Multiplayer multilayer: all layers of PCB.

 

. The toplayer Component layer, bottomlayer wiring and plug-in component welding layer, midlayerx middle layer, these layers are used to draw wires or copper-clad cables (of course, there are also pad for smt smd devices of toplayer and bottomlayer );

2. Top solder, bottom solder, top paste, and bottom
Paste, the four layers are related to the pad crossing over two layers of devices; generally, the holes in the paste layer are smaller than the pad (paste surface means the paste layer, that is to say, printing paste can be made with it.
Steel mesh, this layer only needs to expose all the welding pad that requires SMD welding, and the opening may be smaller than the actual welding pad); then, you need to brush green oil (blocking welding) to the PCB version, this is solder.
Layer, the solder layer should expose the pad. This is the small circle or small side ring we see when only displaying the solder layer, which is generally larger than the soldboard (the solder surface refers to the solder mask layer, yes
It is used to apply the Solder Mask materials such as green oil, so as to prevent the solder from being contaminated with the solder, this layer will expose all the Solder Pad to be welded, and the opening will be larger than the actual Solder Pad ); these layers are usually yellow (copper) or
White (TIN );

3. top overlay and bottom
Overlay, Silk Screen Layer, PCB Surface text or resistance capacitor symbol or device border, generally white;

4. keepout, draw a border, and determine the electrical boundary;

5. Mechanical layer, the real physical boundary, the positioning hole is based on mechanical
The size of the layer, but the PCB factory engineers generally do not understand this. Therefore, it is best to delete the keepout layer before sending it to the PCB factory;

6. multi layer, which runs through each layer, like passing through holes (via to the bottom layer or top layer also has solder and paste );

7. Drill guide, drill drawing, and drilling layer;