1. The full name of AOI (Automatic Optical Inspection) is automatic optical inspection, which is based on optical principles to detect common defects encountered in soldering production.

2. AOI is a modern testing technology that has emerged in recent years and has developed rapidly.

3. Currently, many manufacturers have adopted AOI testing equipment.

4. The main application areas of AOI technology include PCB, FPD, semiconductor, photovoltaic, automotive electronics, and other industries.

5. During automatic detection, the machine scans the PCB using a camera, captures images, and compares the tested solder joints with the qualified parameters in the database.

6. Image processing identifies defects on the PCB and displays or marks them for repair by maintenance personnel.


1. One of the core technologies of high-performance AOI is the ability to provide high-quality, fast, and stable images for camera capture. This capability distinguishes high-end AOI systems from general ones.

2. According to IHS statistics, the scale of China’s AOI market in 2015 reached 7.62 billion yuan, accounting for 20.9% of the global market. The PCB industry made up 64.4% of this total market, with a value of 4.91 billion yuan. For the PCB/FPC industry, the demand for AOI equipment has been rising due to considerations of process, cost, and customer needs:

3. From a technical process perspective, the miniaturization of PCBs has rendered manual visual inspection insufficient, making machine inspection the standard practice.

4. From a production cost standpoint, while the average selling price (ASP) of products continues to decrease, labor costs keep rising. To remain competitive, manufacturers must optimize their production processes to control costs effectively. The adoption of automated testing equipment has become essential.

5. Regarding customer needs, as the complexity of various terminal products increases, so do the demands for reliability. AOI systems can effectively detect defects such as lifted leads and soldering issues, thus enhancing product reliability. For manufacturers, implementing AOI equipment is a key factor in securing customer orders.

6. As product portability requirements grow, electronic component sizes are shrinking, from 0402 to 0201, and now to the even smaller 01005. The latter size represents only 16% and 44% of the area of the previous two sizes, respectively. Components as small as 0402 are already difficult to detect with the naked eye, making 0201 and 01005 components even more challenging.

7. Furthermore, maintenance difficulty is increasing. While 0201 components require a microscope for repairs, 01005 components are nearly impossible to repair manually. Therefore, early detection of defects in the production process is crucial. Integrating AOI equipment into SMT production lines helps manufacturers ensure quality, enhance efficiency, and minimize losses caused by undetected defects.



This revised version clarifies the original text and enhances readability while maintaining the same line structure and numbering.

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