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1, Signal Layers
Altium Designer can provide up to 32 signal layers, including Top Layer, Bottom Layer and Mid-Layer. The layers can be connected to each other through vias, blind vias and buried vias.
(1), Top Layer
is also called component layer, which is mainly used to place components. For double-layer boards and multilayer boards, it can be used to arrange wires or copper.
(2), Bottom Layer
is also called soldering layer, which is mainly used for wiring and soldering. For double-layer boards and multilayer boards, it can be used to place components.
(3) Mid-Layers
can have up to 30 layers. It is used to arrange signal lines in a multi-layer board. Power lines and ground lines are not included here.
2, Internal Planes
is usually abbreviated as the inner electric layer, which only appears in multilayer boards. The number of layers generally refers to the sum of the signal layer and the inner electric layer. As with the signal layer, the inner electric layer and the inner electric layer, and the inner electric layer and the signal layer can be connected to each other through through holes, blind holes, and buried holes.
3, Silkscreen Layers
A PCB board can have up to 2 silk screen layers, namely the top silk screen layer (Top Overlay) and the bottom silk screen layer (Bottom Overlay), generally white, mainly used to place printed information, such as the outline and labeling of components, each A kind of comment characters, etc., to facilitate the soldering of PCB components and circuit inspection.
(1) Top Overlay
is used to mark the projection outline of the component, the label of the component, the nominal value or model, and various annotation characters.
(2)Bottom Overlay
is the same as the top silk screen layer. If all the marks on the top silk screen layer are included, the bottom silk screen layer can be closed.
4, Mechanical Layers
Mechanical layer is generally used to place indicative information related to board manufacturing and assembly methods, such as PCB dimensions, size markings, data materials, via information, assembly instructions and other information. This information varies according to the requirements of the design company or PCB manufacturer. The following examples illustrate our common methods.
Mechanical 1: Generally used to draw the frame of the PCB as its mechanical shape, so it is also called the shape layer;
Mechanical 2: We used to place the process requirement form, including information such as size, plate, and layer;
Mechanical 13 & Mechanical 15: The body size information of most components in the ETM library, including the three-dimensional model of the component; for the sake of simplicity of the page, this layer is not displayed by default;
Mechanical 16: The footprint information of most components in the ETM library can be used to estimate the PCB size in the early stages of the project; for the simplicity of the page, this layer is not displayed by default, and the color is black.
5, Mask Layers
Altium Designer provides two types of mask layers (Solder Mask) and Paste Mask (Mask Layers), in which there are two layers, the top layer and the bottom layer, which will not be described in detail here.
