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What are the dimensions of a single circuit board?

What are the dimensions of a single circuit board?

Answer:

5, Multi layer. Composite layer, the system default gray. Single-sided and double-sided printed on the board, including the level of vias and pads and the level of the line drawing and graphics, because the printed board only bottom pads and vias, double-sided, multilayer printed circuit board in each layer has pads and vias, so called composite layer, single-sided printing in a composite layer, double-sided printed board has the same two composite layer, and multilayer printed circuit board connected via different levels because of the thin copper wire, so the composite layer of multilayer printed circuit board is not the same
3, TOver layer. Top screen printing layer, referred to as: the top screen printing or screen printing layer, the system default for green. Equivalent to the printed circuit board of the top layer of the finished circuit board. 4, Keep Out layer. Wiring layer is forbidden. This level is actually a virtual layer, in most cases is the size of a circuit board with its definition, it is a layer, it is not as good as a frame, but its role is not only larger, with the level of the line to define the circuit board size, but not the frame. It can well realize the automatic wiring, Protel wiring layer according to the prohibition of drawing within the range of components for automatic wiring, wiring absolute range will not exceed this box, if in this box to disable the wiring layer draw a line or draw a small box, circle, arc graph, automatic routing is not over no wiring layer painting line and graphics. It is said that the definition of PCB Factory circuit wiring layer with the frame is not prohibited, but using mechanical layer (Multi layer), in fact, in the actual drawing, almost all circuit boards are prohibited wiring layer definition circuit board frame, really do, how to define the circuit frame is designed, the printed circuit board industry manufacturers.
The level of a single circuit board is usually made up of the following 5 aspects: 1. The TOP layer. The top copper thin wire layer, referred to as: the top line or the top, the system default is red. This level in the double-sided printed board that is the top of the copper thin wire, in a single-sided printed board, said the jumper. 2, BOT layer. The bottom layer of copper thin line, referred to as: the bottom line or the bottom layer, the system default for the blue. This layer represents a thin copper strip that connects the pads and vias of the circuit board, but does not include the pads and vias.

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