PCB (printed circuit board) is a printed circuit board, which is one of the important components of the electronics industry. Almost every kind of electronic equipment, from electronic watches, calculators, to computers, communication electronic equipment, military weapon systems, as long as there are electronic components such as integrated circuits, in order to make the electrical interconnection between each component, printed board. The printed circuit board is composed of an insulating substrate, connecting wires, and pads for assembling and soldering electronic components, and has a dual role of a conductive circuit and an insulating substrate. It can replace complicated wiring and realize the electrical connection between various components in the circuit, which not only simplifies the assembly and welding of electronic products, reduces the wiring workload in the traditional way, and greatly reduces the labor intensity of workers; Volume, reduce product costs, and improve the quality and reliability of electronic equipment. The printed circuit board has good product consistency. It can adopt standardized design, which is conducive to mechanization and automation in the production process. At the same time, the entire printed circuit board after assembly and debugging can be used as an independent spare part, which is convenient for the interchange and maintenance of the whole product. At present, printed wiring boards have been widely used in the production of electronic products.
The earliest printed circuit boards used were paper-based copper-clad printed boards. Since the appearance of semiconductor transistors in the 1950s, the demand for printed boards has risen sharply. In particular, the rapid development and wide application of integrated circuits have made electronic devices smaller and smaller, and the density and difficulty of circuit wiring have become more and more difficult. This requires printed boards to be constantly updated. At present, the variety of printed boards has developed from single-sided boards to double-sided boards, multilayer boards and flexible boards; the structure and quality have also developed to the level of ultra-high density, miniaturization and high reliability; new design methods, design supplies and Board-making materials and board-making processes continue to emerge. In recent years, various computer-aided design (CAD) printed circuit board application software has been popularized and promoted in the industry. Among specialized printed circuit board manufacturers, mechanized and automated production has completely replaced manual operations.
