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The full Chinese name of AOI is Automatic Optical Inspection, which is an equipment that detects common defects encountered in welding production based on optical principles. AOI is a new type of test technology that is emerging, but it is developing rapidly, and many manufacturers have introduced AOI test equipment. During 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, after image processing, checks out the defects on the PCB, and displays/marks the defects through the display or automatic signs Come out and be repaired by maintenance personnel.
Use high-speed and high-precision visual processing technology to automatically detect various mounting errors and soldering defects on PCB boards. PCB boards can range from fine-pitch high-density boards to low-density large-size boards,
and can provide online inspection solutions to improve production efficiency and welding quality. By using AOI as a tool to reduce defects, errors can be found and eliminated early in the assembly process to achieve good process control. Early detection of defects will avoid sending bad boards to the subsequent assembly stage. AOI will reduce repair costs and avoid scrapping unrepairable circuit boards.
During 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, after image processing, checks out the defects on the PCB, and displays/marks the defects through the display or automatic signs Come out and be repaired by maintenance personnel. AOI (area of interest), that is, the information surface, also called the interest surface, is a geographic entity in the form of an area in the map data.
In order to carry out quality control, effective inspection must be carried out on the SMT production line. As the size of the circuit board changes, it poses more challenges because it makes manual inspection more difficult. In response to these developments, more and more original equipment manufacturers are adopting AOI. By using AOI as a tool to reduce defects, find and eliminate errors in the early assembly process to achieve good process control. Early detection of defects will avoid sending bad boards to the subsequent assembly stage, and AOI will reduce repair costs and avoid scrapping. The repaired circuit board appears.
Before the advent of AOI, the inspection of the board was done manually by the operator. This process involves many operators working with microscopes at the stations of the smt production line. Generally, check the surface of the board to see if there are missing components, mis-sticking or solder paste defects. The board is inspected by the image limiting method, and each station inspects 1/4 of the board. Although for small boards, this inspection method is easy to implement, as the board size increases and there are thousands of components, this inspection method is overwhelmed. The detection elements are accuracy and reliability, and manual detection also has its limitations when done best.
