Classification of Printed Circuit Boards
The printed circuit boards used in electronic products are very different, and we can divide them into different types of printed circuit boards according to different printed circuit board material and assembly. The following is the specific classification of printed circuit boards.
Number of circuit layers
Divided into single-sided, double-sided, and multi-layer boards. Common multi-layer boards are generally 3-6 layers, and complex multi-layer boards can reach more than ten layers.
(1)Single panel
On the most basic printed circuit board, the printed circuit board assembly is concentrated on one side, and the wires are concentrated on the other side. Because the wires only appear on one side, this type of printed circuit board is called a single-sided board. Because single-sided boards have many strict restrictions on the design of the circuit (because there is only one side, the wiring cannot cross and must be around a separate path), so early circuits used this type of circuit board.
(2)Double panel
This kind of circuit board has wiring on both sides. In order to connect the wires on both sides, there must be a proper circuit connection between the two sides. This kind of connection between the circuits is called a via. A via is a small hole filled or coated with metal on a printed circuit board, which can be connected with wires on both sides. Because the area of the double-sided board is twice as large as that of the single-sided board, and the wiring can be interleaved (it can be wound to the other side), the double-sided board can be used in more complicated circuits than the single-sided board.
(3)Multilayer board
In order to increase the area that can be wired, multilayer boards use more single or double-sided wiring boards. The multi-layer board uses several double-sided boards, and a layer of the insulating layer is placed between each board and then glued firmly. The number of layers of a circuit board means that there are several independent wiring layers. Usually, the number of layers is an even number and contains the two outermost layers.
Substrate type
(1)Flexible PCB board (flexible board)
The flexible board is a printed circuit board made of a flexible substrate. Its advantage is that it can be bent and is convenient for the assembly of electrical components. FPC has been widely used in aerospace, military, mobile communications, laptop computers, computer peripherals, PDAs, digital cameras, and other fields or products.
(2)Rigid PCB board
It is made of a paper base (usually used for single-sided) or glass cloth base (usually used for double-sided and multilayer), pre-impregnated with phenolic or epoxy resin, one or both sides of the surface layer are glued with copper foil and then laminated and cured. This kind of PCB copper clad board, we call it a rigid board. Then made into PCB, we call it rigid PCB. A rigid board is a printed circuit board made of a rigid substrate that is not easy to bend and has a certain degree of toughness. Its advantage is that it can provide certain support for the electronic components attached to it.
(3)Rigid-flex combined PCB board (rigid-flex combined board)
A Rigid-flex board refers to a printed circuit board that contains one or more rigid areas and flexible areas, which is composed of a rigid board and a flexible board laminated together. The advantage of the rigid-flex board is that it can not only provide the support of a rigid printed board but also have the bending characteristics of a flexible board, which can meet the needs of the three-dimensional assembly.
Different printed circuit boards have different applications in products. We need to choose according to its characteristics and uses. If you want to know more about printed circuit boards after reading the above content, you can get more detailed information by contacting us. At the same time, we also produce high-quality printed circuit boards and provide comprehensive solutions to meet your needs.
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