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What is Automatic Optical Inspection (AOI)

May 5, 2021

      Automatic Optical Inspection (AOI) is an automatic visual inspection of printed circuit board manufacturing, in which the camera automatically scans the device under test for catastrophic failures (such as missing components) and quality defects.

      It is commonly used in manufacturing processes because it is a non-contact test method.This ensures the high reliability of multi-CB multilayer circuit board.

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  • This is especially important for the following applications :

  • Line width violations

    Spacing of violations

    Excess copper

    The lack of mat

    A short circuit

    High frequency

    High power load


  • Advantages of AOI Testing

  • According to its visual method, AOI tests can be used to detect many surface defects, such as openings, short circuits, incorrect components, missing components, etc.

  • Here are the benefits of AOI testing:

    Multiple detection objects - AOI testing is not only applicable to PCB, but also PCB assembly.For PCB, check for defects, such as short circuit, open circuit, and insufficient solder.For PCB assembly, check issues including component soldering, polarity, and numerical values.

  • Low Cost - Compared to Automatic X-ray Inspection (AXI), AOI is cheaper when inspecting solder joint defects.

  • Good flexibility - AOI testing can be arranged at any stage of the manufacturing process according to need and cost tolerance capacity.In order to reduce the corresponding cost and improve the detection efficiency, it is best to conduct AOI test after reflow soldering.Because most defects are the result of welding process failures.The good flexibility of AOI testing reduces costs.Because once a problem is discovered, manufacturing or assembly parameters can be changed immediately so that subsequent products can be produced correctly.