The origin and development of PCB
PCB (printed circuit board), whose Chinese name is printed circuit board, is one of the important components in the electronic industry. Almost every kind of electronic equipment, from electronic watches and calculators to computers, communication electronic equipment and military weapon systems, as long as there are electronic components such as integrated circuits, printed boards should be used for the electrical interconnection between them. In the research process of large-scale electronic products, the most basic success factors are the design, documentation and manufacturing of the printed board of the product. The design and manufacturing quality of printed board directly affect the quality and cost of the whole product, and even lead to the success or failure of commercial competition.
effect
After the electronic equipment adopts printed boards, due to the consistency of similar printed boards, the error of manual wiring is avoided, and the automatic insertion or pasting, automatic soldering and automatic detection of electronic components can be realized, which ensures the quality of electronic equipment, improves labor productivity, reduces cost and is convenient for maintenance.
source
The creator of printed circuit board was Austrian Paul Eisler. In 1936, he first adopted printed circuit board in radio. In 1943, Americans mostly applied this technology to military radios. 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 the emergence of PCB, the interconnection between electronic components was completed by direct connection of wires. Nowadays, circuit boards exist only for experimental application in the laboratory; Printed circuit board has certainly occupied the position of absolute control in the electronic industry.
development
Since the reform and opening up, China has attracted large-scale transfer of European and American manufacturing industry due to preferential policies in labor resources, market and investment. A large number of electronic products and manufacturers have set up factories in China, which has driven the development of related industries including PCB. According to the statistics of China's CPCA, the actual output of PCB in China reached 130 million square meters and the output value reached US $12.1 billion in 2006, accounting for 24.90% of the total output value of PCB in the world, surpassing Japan and becoming the first in the world. From 2000 to 2006, the average annual growth rate of China's PCB market reached 20%, far exceeding the global average. The global financial crisis in 2008 had a huge impact on the PCB industry, but it did not cause a disastrous blow to China's PCB industry. Stimulated by national economic policies, China's PCB industry recovered in an all-round way in 2010, and China's PCB output value reached US $19.971 billion in 2010. Prismark predicts that China will maintain a compound annual growth rate of 8.10% from 2010 to 2015, higher than the global average growth rate of 5.40%.
Printed boards have developed from single-layer to double-sided, multi-layer and flexible, and still maintain their respective development trends. Due to the continuous development in the direction of high precision, high density and high reliability, reducing the volume, reducing the cost and improving the performance, the printed board will still maintain strong vitality in the development project of electronic equipment in the future.
The discussion on the development trend of future printed board production and 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, multilayer, high-speed transmission, light weight and thin, and to improve productivity, reduce cost, reduce pollution and adapt to multi variety and small batch production. The technological development level of printed circuit is generally represented by the line width, aperture and plate thickness / aperture ratio on the printed board
