In fact, the biggest disadvantage of AOI is that some shadows are not very obvious, and it is easier to misjudgment. These may be distinguished by different colors of lights, but the most troublesome ones are those that are Components covered by other parts and solder joints located under the components, because traditional AOI can only detect the places that can be reached by direct light, such as the ribs of the screen frame or the components under the edges. AOI fails to detect Arrived and missed the part.
In addition, because optical inspection is subject to factors such as light, angle, resolution, etc., the following shortcomings can only be detected under certain conditions. it is difficult to achieve a 100% detection rate.
If it is a wrong part with a different shape, or a part with a different print on the surface, AOI should be able to check it out. But if the appearance is not significantly different, and there is no surface printing, such as resistors and capacitors below 0402 size, these are difficult to detect with AOI.
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