Domestic research on the automatic inspection system of printed circuit boards began in the early and mid-1990s, and it has just started. There are relatively few scientific research institutes engaged in this research, and because of the influence of various factors, the research on the automatic optical inspection system for printed circuit board defects is also at a relatively early level. It is precisely because the automatic detection system of foreign printed circuit boards is too expensive, and there is no real automatic detection equipment for printed circuit boards developed in China, so most domestic circuit board manufacturers still use manual magnifying glasses or projectors to view. way to check. Due to the high labor intensity of manual inspection, the eyes are prone to fatigue, and the missed inspection rate is very high. Moreover, with the development of electronic products towards miniaturization and digitization, printed circuit boards are also developing towards high density and high precision, and manual inspection methods are basically impossible to achieve. For higher density and precision circuit boards (0.12~0.10mm), it has been completely impossible to test. The backwardness of testing methods has led to the current domestic product qualification rate of multi-layer boards (8-12 layers) of only 50-60%.
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