Automated Optical Inspection (AOI) is a type of automated visual inspection of printed circuit board manufacturing in which cameras automatically scan the device under test for catastrophic failures (such as missing components) and quality defects.

Since it is a non-contact testing method, it is often used in manufacturing processes. Guaranteed the high reliability of the multilayer circuit board.

Especially important for the following application areas:

• line width violation
• spacing violation
• excess copper
• missing pad
• short circuit
• high frequency
• high power load

Advantage

According to its visual method, AOI testing can be used to detect many surface defects, such as open circuits, short circuits, wrong components, missing components, etc.

The following are the advantages of AOI testing:

1. Multiple detection objects - AOI testing is not only suitable for PCB, but also for PCB assembly. For PCBs, inspect for defects such as shorts, opens, and insufficient solder. forpcba processing,
2. Low Cost - AOI is less expensive to detect solder joint defects than Automated X-ray Inspection (AXI).
3. Good flexibility - AOI testing can be arranged at any stage of the manufacturing process according to needs and cost affordability. In order to reduce the corresponding cost and improve the detection efficiency, SMT manufacturers should do AOI test after reflow soldering. Because most defects are caused by failures in the welding process. Good flexibility performance of AOI testing leads to cost reduction. Because once a problem is found, the manufacturing or assembly parameters can be modified immediately so that subsequent products can be produced correctly.

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