With the development of science and technology, the application of PCB is more and more extensive. PCB is divided into single-sided PCB, double-sided PCB and multi-layer PCB. Common multi-layer boards are generally 4-layer PCB or 6-layer PCB, complex multi-layer board. It can be used in dozens of layers and is widely used in consumer electronics, computers, communication tools, medical equipment and other fields.
In terms of application industry distribution, consumer electronics accounted for the highest proportion, up to 39%; followed by computer accounted for 22%; communication accounted for 14%; industrial control, medical instruments accounted for 14%; automotive electronics accounted for 6%; Aerospace accounts for 5% of the total, and the requirements for PCB precision in aerospace and medical instruments are very high. China's current PCB industry scale is the world's first
. In terms of product structure, multi-layer boards occupy most of the output value ratio. HDI PCB
and flexible boards have a certain scale, they are advanced in technology and foreign countries.
PCBs can be used in such a wide range of applications, thanks to its many unique advantages, summarized as follows.
1, can be high density. The high density of PCBs can grow with the integration of integrated circuits and advances in mounting technology.
2. High reliability. A series of inspections, tests, and aging tests ensure that the PCB works long-term and reliably.
3, designability. For the various performances of PCB (electrical, physical, chemical, mechanical, etc.), the design of printed boards can be realized through design standardization and standardization, with short time and high efficiency.
4, can be productive. With modern management, it can carry out standardization, scale (quantity), automation and other production to ensure product quality consistency.
5, testability. Established relatively complete test methods, test standards, various test equipment and instruments to detect and identify PCB product qualification and service life.
6, can be assembled. PCB products not only facilitate the standardized assembly of various components, but also can be automated, large-scale mass production. At the same time, the PCB and various component assembly components can be assembled to form larger components and systems up to the complete machine.
7, maintainability. Since PCB products and various component assembly components are produced in a standardized design and scale, these components are also standardized. Therefore, once the system fails, it can be replaced quickly, conveniently and flexibly, and the system can be quickly restored.