Detailed description of the detection principle and functional role of AOI

AOI, also known as Automatic Optical Inspection Instrument, includes functions such as automatic inspection, automatic alarm, and abnormal display, which can basically achieve automated operation. AOI testing is an essential process in the surface mount processing of PCBA OEM materials. Automatic optical inspection in PCBA processing is a device that uses optical principles to detect common defects produced during the soldering process. When performing automatic inspection, the machine automatically scans the PCB through a camera to capture images. After comparing the tested solder joints with qualified parameters in the database, defects on the PCB are detected through image processing. At the same time, the defects are displayed or marked through a monitor or automatic marker, making it convenient for maintenance personnel to repair them.

AOI detection principle: By using optical principles, the camera on the device automatically scans the PCB, collects images, and then compares the collected processed solder joint data with the qualified data in the machine database. After image processing, the welding status of PCBA outsourcing materials is marked..

Advantages of AOI equipment: With the development of electronic products towards miniaturization, PCBA design is becoming more and more precise. The difficulty of manual visual inspection alone is also increasing. Due to eye fatigue caused by long-term inspection, AOI is of great use. The main advantages are as follows:

1. It can save manpower and reduce labor costs;

2. Improve production efficiency and production capacity;

3. Improve the qualification rate of incoming goods;

4. Collect testing data, provide process analysis, and strengthen process capabilities;

5. Unified testing standards that do not differ due to different lines;

6. Able to provide timely feedback and statistics on production issues;

AOI placement location:

1. After surface mount processing is completed, it can effectively prevent issues such as missing components, polarity, displacement, monument placement, and reverse side.

2. Use after reflow soldering: Located at the end of the production line, the detection system can effectively detect issues such as missing, offset, and skewed components in PCBA processing, the correctness of solder joints and whether there is insufficient solder volume, as well as defects such as soldering short circuits and curling feet.