The role of AOI

The Chinese full name of AOI is automatic optical inspection, which is a device based on optical principles to detect common defects encountered in welding production. AOI is a new testing technology that has emerged in recent years, and its development is rapid. Many manufacturers have launched AOI detection equipment. When the machine performs automatic inspection, the PCB is scanned and images are collected through a camera. The tested solder joints are compared with the qualified parameters in the database, and defects on the PCB are detected through image processing. The defects are displayed/marked on the monitor or automatic markers for maintenance personnel to repair. AOI uses high-speed and high-precision visual processing technology to automatically detect various mounting errors and welding defects on PCB boards. The range of PCB boards can range from fine pitch high-density boards to low-density large-sized boards, and online inspection solutions can be provided to improve production efficiency and soldering quality. So, by using AOI as a tool to reduce defects and identify and eliminate errors in the early stages of the assembly process, good process control can be achieved; Early detection of defects can avoid sending defective boards to the final assembly stage, thereby reducing repair costs and avoiding scrapping irreparable circuit boards.

Automatic Optical Inspection (AOI) is an effective detection method for industrial automation, which uses machine vision as the detection standard technology and is widely used in LCD/TFT, transistor, and PCB industrial processes. In daily life applications, it can be extended to security systems.
; Automatic optical inspection is a common and representative technique in industrial processes, which uses optical methods to obtain the surface state of finished products and detects defects such as foreign objects or pattern abnormalities through image processing. As it is a non-contact inspection, semi-finished products can be inspected in the intermediate engineering. AOI is a new testing technology that has only emerged in recent years, but its development is rapid, and many manufacturers have launched AOI testing equipment. Taking the AOI inspection developed and produced by Shenzhen Hongant Intelligent Equipment Co., Ltd. as an example, the company has developed a fully automatic online substrate appearance inspection machine AOI. The machine is equipped with a global exposure camera, which not only eliminates the ghosting phenomenon of rolling shutter cameras, but also increases the speed by more than 30%. In addition, the telecentric lens on the equipment solves the problem of image distortion in traditional wide-angle lenses and can easily handle the inspection of high component side solder pads; It is compatible with various shapes of solder pads and uses the wave soldering algorithm for more accurate positioning. It is proficiently used in the SMT industry and has received numerous praises in the industry.