Analysis of the continuous development of PCB industry - Multilayer PCB

Analysis of the continuous development of PCB industry - Multilayer PCB

The continuous development of circuit board industry mainly benefits from two aspects. First, the market space of the application industry in the circuit board industry continues to expand, and the applications in the communication industry, automobile industry and industrial control industry have been improved, which makes the high-end multi-layer PCB market grow very rapidly, with the current application proportion reaching 50%. At the same time, the proportion of digital circuit board in color TV, mobile phone and automotive electronic products has also increased significantly, thus expanding the space of circuit board industry. Now chengzhiyi circuit editor will talk about Multilayer PCB with you.

Multilayer PCB circuit board is composed of three or more layers of conductive patterns and insulating materials. The conductive patterns between them are connected with each other according to the requirements. Multilayer PCB is the product of the development of electronic information technology in the direction of high speed, multi-function, large capacity, small volume and light weight. According to the characteristics, the circuit board can be divided into metal circuit board, FR-4 fiberglass board and hard and soft combination board.

In China, the research on PCB automatic detection system also began in the early 1990s, and there are few research institutions engaged in this research. Due to the influence of various factors, the research on PCB defect automatic optical detection system also stays at a relatively primary level. It is because the foreign PCB automatic detection system is too expensive, the real sense of PCB automatic detection equipment has not been developed in China, so most domestic PCB manufacturers still use the magnifying glass or projector manual detection method. Due to the high labor intensity of manual inspection, eyes are easy to fatigue, and the rate of missed inspection is very high. Moreover, with the development of electronic products in the direction of miniaturization and digitization, printed circuit boards are also developing in the direction of high density and high precision, which is difficult to achieve by manual detection. For the circuit board with higher density and higher accuracy (0.12 ~ 0.10 mm), it is totally impossible to test. Due to the backward testing methods, the qualified rate of domestic multilayer board (8-12 layers) is only 50-60%. It also increases a lot of costs. Especially some boards with higher difficulty

PCB circuit board determines the process difficulty and processing price according to the number of wiring surface. Ordinary PCB circuit board is divided into single-sided wiring and double-sided wiring, commonly known as single panel and double-sided board. But for high-end electronic products, due to the limitation of product space design factors, in addition to surface wiring, multi-layer circuits can also be stacked inside, resulting in the birth of multi-layer PCB. In the production process, after each layer of circuit is made, it is positioned and pressed by optical equipment, so that multi-layer circuits can be stacked on a PCB. Commonly known as multilayer PCB circuit board. Any circuit board with more than or equal to 2 layers can be called multilayer circuit board. It can be divided into soft PCB and hard PCB