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The definition of PCB

- Jan 19, 2018 -

Printed circuit board {PCB circuit board}, also known as printed circuit board, is the electrical connection of electronic components of the provider. Its development has been over 100 years ago. Its main design is layout design. The main advantage of circuit board is to greatly reduce wiring and assembly errors, improve automation level and production labor rate.


According to the number of circuit board layers, it can be divided into single panel, double-sided board, four laminate, six laminate and other multi-layer circuit board.


The printed circuit board is not a general terminal products, so in the name of the definition of slight confusion, such as a personal computer with a motherboard, called the motherboard, but not directly called the circuit board, although the host circuit board in existence, but is not the same, so the evaluation of the industry when they are related but can not say the same. For example, because there are integrated circuit parts loaded on the circuit board, the news media call him a IC board, but in essence, he is not the same as the printed circuit board. The printed circuit board we usually refers to the circuit board that no bare board components.



Single panel


On the most basic PCB, the parts are concentrated on one side, and the wires are concentrated on the other side. The PCB is called a single panel (Single-sided), because the wire only appears on one side. Because the single panel has many strict restrictions on the design line (because only one side, the wiring can't cross and must be around the independent path), so only the early circuit used this kind of board.


Double-sided plate


Both sides of this circuit board have wiring, but to use two sides of the wire, it is necessary to have a proper circuit connection between the two sides. The "bridge" between these circuits is called the guide hole (via). A guide hole is a small hole in the PCB, filled with or coated with metal, which can be connected to the two sides of the wire. Because the area of double sided panels is twice larger than that of a single panel, double panels solve the difficulty of wiring interlacing in single panel (which can be passed to the other side through guide holes), which is more suitable for more complex circuits than single panel.


Multi-layer plate


In order to increase the area that can be wired, the multi-layer board uses more single or double-sided wiring boards. With a double and two single block as inner layer as the outer layer or two double-sided printed circuit board for the outer layer of the inner layer, two single block, through the positioning system and an insulating adhesive material alternately printed circuit board according to the design requirements for interconnection together and the conductive pattern becomes the four layer, six layer printed circuit board, also known as for multilayer printed circuit board. The number of layers does not mean that there are several independent wiring layers. Under special circumstances, the empty layer will be used to control the thickness of the plate. Usually the number of layers is even and contains the two most lateral ones. Most of the motherboards are 4 to 8 layers of structure, but the technical theory can achieve nearly 100 layers of PCB board. Large scale supercomputers mostly use quite many layers of motherboards. However, because such computers have been replaced by clusters of many common computers, super multilevel boards have been gradually unused. Because of the close combination of the layers in the PCB, it is generally not easy to see the actual number, but if you carefully observe the host board, you can see it.