Printed circuit board (PCB) is a structural component composed of insulating materials and conductor wiring. When the final product is manufactured, integrated circuits, transistors, diodes, passive components (such as resistors, capacitors, connectors, etc.) and various other electronic components will be installed on it. By connecting wires, electronic signal connection and corresponding functions can be formed. Therefore, the printed circuit board is a platform to provide component connection, which is used to undertake the base of connecting parts. Printed circuit boards (PCBs) are not general end products, so the definition of their names is somewhat confusing. For example, the motherboard for personal computers is called the motherboard, but it can not be called the circuit board directly, although there are circuit boards in the motherboard. For example, some news media call it IC board because IC parts are loaded on the circuit board, but in essence it is not the same as printed circuit board.
Printed circuit boards are manufactured according to the product performance and parts configuration set by the designer, and their forms are very diverse without too many restrictions. Electronic products are progressing rapidly, and design changes or parts updates may necessitate redesigning the required circuit boards. Therefore, most of the products will be small-scale trial production before enlargement, which may undergo many modifications. With the multifunction and complexity of electronic products, frequent changes seem to be the subject that all electronic component suppliers must face.
Printed circuit boards (PCBs) are mainly composed of electrical connections and load-bearing components. Basically, PCBs must have the characteristics of heat resistance, high strength, low resistance, low noise and good insulation between layers. In terms of manufacturability, it must have good assemblability, usually referring to weldability or connectivity.
Under the premise that electronic products tend to be multi-functional and complex, the contact distance of integrated circuit components will be reduced, and the speed of signal transmission will be relatively increased. With the increase of the number of wiring and the shortening of the length of local wiring between points, high-density line configuration and microporous technology are needed to achieve the goal. Wiring and spanning are basically difficult to achieve for single and double panels, so PCBs tend to be multi-layered; moreover, with the increasing number of signal lines, more power and ground layers become the necessary means of design, which makes multi-layer printed circuit boards more common.
Overall, the printed circuit board industry is a multi-technology integration of electrical design, mechanical manufacturing, chemical and chemical processes, material science and technology and so on. Only by bringing together the technologies in various fields and integrating them properly can we achieve the desired characteristics of this product, which is also the direction of most advanced products.