source:Industry News release time:2022-03-14 Article author:sznbone Popular:pcb
Compared with single-sided and double-sided four-layer circuit boards, what layers are they composed of, what does each layer represent, and what are the uses? Four-layer circuit boards are mainly composed of the following layers: Signal Layers (signal layer), InternalPlanes (internal power supply), Mechanical Layers (mechanical layer), Masks (solder mask layer), Silkscreen (silkscreen layer), and System (system working layer).
1. The signal layer is divided into top layer, middle layer and bottom layer, which are mainly used for placing various components, or for wiring and welding.
2. The internal power supply layer is also called the internal electrical layer, which is dedicated to the layout of power lines and ground lines.
3. The mechanical layer is generally used to place indicative information about board making and assembly methods, such as circuit board physical dimension lines, data data, via information, etc.
4. The solder mask layer also has a top layer and a bottom layer, and the pads or other objects placed on this layer are copper-free areas.
5. The silk screen layer is mainly used to draw the outline of the component, place the number of the component or other text information.
6. The system working layer is used to display information that violates the design rule check.
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