Board), whose Chinese name is printed circuit board, is one of the important parts of electronic industry. Almost every kind of electronic equipment, from electronic watches and calculators to computers, communication electronic equipment, military weapon systems, as long as there are electronic components such as integrated circuits, printed boards are used for electrical interconnection between them. In the research and development of large-scale electronic products, the most basic success factors are the design, documentation and manufacture of printed boards. The design and manufacturing quality of printed circuit board directly affects the quality and cost of the whole product, and even leads to the success or failure of commercial competition.

After electronic equipment adopts printed boards, due to the consistency of similar printed boards, manual wiring errors can be avoided, and automatic insertion, welding and testing of electronic components can be realized, thus ensuring the quality of electronic equipment, improving labor productivity, reducing costs and facilitating maintenance.

Printed boards have developed from single-layer to double-sided, multi-layer and flexible, and still maintain their own development trend. Due to the continuous development in the direction of high precision, high density and high reliability, as well as the continuous shrinking of volume, the reduction of cost and the continuous improvement of performance, printed boards will still maintain strong vitality in the future development of electronic equipment.

Summarize that the future development trend of PCB manufacturing technology at home and abroad is basically the same, that is, to develop in the direction of high density, high precision, fine aperture, fine wire, fine spacing, high reliability, multi-layer, high-speed transmission and thinness, and at the same time to improve productivity, reduce costs, reduce pollution and adapt to multi-variety and small batch production. The technical development level of printed circuits is generally expressed by the line width, aperture and thickness/aperture ratio of printed boards.

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The creator of printed circuit board is Austrian Paul isler (Paul.

Eisler), 1936, he first adopted the printed circuit board in the radio. 1943, Americans mostly applied this technology to military radio stations. In 1948, the United States officially recognized that this invention can be used for commercial purposes. Since the mid-1950s, printed circuit boards have been widely used.

Before PCB appeared, the interconnection between electronic components was completed by direct connection of wires. The current circuit board only exists in the laboratory for experimental application; Printed circuit boards have occupied an absolute control position in the electronic industry.