What is AOI inspection?

Automated Optical Inspection (Automated Optical Inspection, referred to as AOI), for high-speed, high-precision optical image inspection system, the use of machine vision as a standard technology for testing, can improve the traditional human use of optical instruments to detect the shortcomings of the level of applications, including research and development from high-tech industries, manufacturing quality control, and even national defense, people's livelihood, The applications range from R&D and manufacturing quality control in high-tech industries to national defense, livelihood, medical, environmental protection, and electric power.

Taking SMT inspection as an example, when the automatic inspection, the machine automatically scans the PCB through the camera, collects images, compares the tested solder joints with the qualified parameters in the database, and checks the defects on the PCB through the image processing, and displays/labels the defects through the monitor or the automatic sign for the maintenance personnel to fix.

Expanded Information

AOI four inspection positions: ?

(1), after the solder paste printing, mainly to check the solder paste printing;

(2), after the chip component placement, in order to check the correctness of the patch, you can find the error earlier and reduce the cost;

(3), after the chip placement, the detection system is able to check the PCB is missing, offset, crooked chip and chip polarity error;

(4), after reflow soldering, at the end of the production line. The inspection system can check the missing, offset and skewed components and component polarity defects.

AOI four inspection positions, after the solder paste printing, (chip) device placement and component placement after the inspection is aimed at preventing problems, in these positions to detect, can prevent defects; in the reflow soldering after the inspection, the purpose is to find problems. The AOI is placed in front of the oven to prevent problems, and the AOI is placed behind the oven to find problems.

Baidu Encyclopedia-Automated Optical Inspection