The Working Principle and Application Industries of AOI Light Sources

The full name of AOI is Automated Optical Inspection, which is a device that detects common defects in welding production based on optical principles. AOI is an emerging testing technology, but it has developed rapidly, and many manufacturers have launched AOI testing equipment. During the automatic inspection process, the machine automatically scans the PCB through a camera, collects images, compares the tested solder joints with the qualified parameters in the database. Through image processing, it detects the defects on the PCB, and displays/marks the defects through a monitor or an automatic marker, enabling the machine to identify defective products.

The Application Scope of AOI Light Sources
       Currently, AOI machine vision light sources are generally used for some special detections, such as IC component detection, PCB substrate detection, integrated circuit printing detection, plastic container part detection, liquid crystal screen calibration, microscope illumination, and are specifically used for circuit board welding detection, etc.
       The three-color illumination has different angles, effectively highlighting the three-dimensional information of the solder with clear layers; the diffuser plate conducts light, making the light uniform and reducing reflection; red, blue, green, three colors are matched, and other colors are optional.
       Multi-color and multi-angle illumination can highlight the surface layer information of the product.
       It can be used to detect defects such as missing components, wrong components, skew, missed soldering, cold soldering, excessive solder, lack of solder, bridging, and polarity errors on the PCB board.

The Advantages of AOI Light Sources

1. Strong customizability. Red, green, blue, and white four colors can be customized to form combined light at any angle.

2. Through the controller, the computer can adjust the brightness of the light source or the lighting module to increase the brightness of the light source.

3. The special AOI light source can be combined according to different illumination angles and different colors, thus highlighting the three-dimensional information of the object.

4.  It can provide sufficient illumination intensity to ensure that the detection system can clearly capture the images of the detected objects, and it can also have a good imaging effect even for tiny details and defects.

5.  It can achieve a very uniform light distribution within a large illumination area, avoiding detection errors caused by uneven illumination. This makes the detection results more stable and reliable, reducing the possibility of false positives and faves negatises.