Briefly describe what is the AOI automatic optical inspection?

AOI (Automatic Optic Inspection) is an emerging new type of testing technology that is based on the optical principle to detect common defects encountered in PCBA processing and welding production. AOI uses a variety of dedicated multi-function detection algorithms and binary or gray level optical imaging processing techniques for detection. Although AOI can be used in multiple locations on a production line where individual defects can be detected, AOI inspection equipment should be placed in a location where defects can be identified and corrected as early as possible. The AOI is usually placed at the very end of the production line where the device can generate a wide range of process control information.

The AOI inspection process must and can handle the problems caused by different changes. By using AOI as a tool to reduce defects, find and eliminate errors early in the assembly process to achieve good process control. Early detection of defects can prevent the bad board from being sent to the subsequent assembly stage.

The PCBA plant uses inspection equipment to monitor the production process. Detailed defect classification and component placement offset information is typically included. Manufacturers prioritize this goal when product reliability is important, low-mixing high-volume manufacturing, and component supply are stable. This often requires placing inspection equipment at several locations on the production line, monitoring specific production conditions online, and providing the necessary basis for adjustments in the production process.

The AOI software has a comprehensive verification function that reduces false positives and ensures flawless detection. It can inspect stored samples that are defective, such as samples stored at a repair station, as well as blank printed circuit boards on which solder paste is printed. In the optimization phase, the reason for spending time in this area is to prevent any defects from slipping past. All known defects must be checked and the number of false positives allowed to be minimized. When adjusting any program to reduce false positives, check to see if the straightforward defects that were previously checked are confirmed by the service station. Through comprehensive verification, the quality of the inspection process is guaranteed for specialized manufacturing and verification, while false positives are tracked.