Through scanning of the production circuit board to catch out the defects via comparing the exist circuit against the digital “images” from original design.
![](https://pcbweller.com/app/uploads/2020/11/PCB-inner-AOI-illustration.png)
The purpose of this stage is to sort out the defects PCB in inner layers production, and do not leave it to next production process.
![](https://pcbweller.com/app/uploads/2020/11/PCB-inner-AOI-inspection-process-1.png)
WELLE’s value:
Latest leading AOI machine+90% automatic running instead of manual scanning work.
![](https://pcbweller.com/app/uploads/2020/10/PCB-inner-AOI.jpg)