Smart Gui - Algorithm Training Material_rev1.pdf - 第135页

Copyright © ViT rox All Rights Reserved . Lead Ringer - T ypes of Ringer T ests 6. T oe Stick Out Differs • Anchor set to (Lead T ip anchor) • Image Plane: Angle 3 • Software measure the mean intensity of the pixels cont…

Lead Ringer - Types of Ringer Tests

5. Toe Finish Melt Differs

• Anchor set to (Lead Tip anchor)

• Image Plane: Angle 3

• Software measure the mean intensity of the pixels contained within the 2 ROI.compare each lead with its

neighbours (per row comparison), with invert check (invert the results if most of the leads of the row are defects).

• Inspection area: Lead Tip Area

• When the board is reflowed, the heat might melt the solder on the side of the lead toe, which will not happen if

the lead is not connected to the solder, i.e. lifted.

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Lead Ringer - Types of Ringer Tests

6. Toe Stick Out Differs

• Anchor set to (Lead Tip anchor)

• Image Plane: Angle 3

• Software measure the mean intensity of the pixels contained within the ROI.compare each lead with its

neighbours (per row comparison), with invert check (invert the results if most of the leads of the row are defects).

• Inspection area: Lead Tip Area

• If the lead is deformed, the toe will stick out and the region of interest will get brighter.

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Lead Ringer - Types of Ringer Tests

7. Toe Fillet Curvature Too Low

• Anchor set to (Lead Tip anchor)

• Image Plane: Angle 1 & Angle 2

• Software measure the mean intensity of the pixels contained within the 2 ROI.compare each lead to a threshold

• Inspection area: Lead Tip Area

• If the lead is lifted, the solder shape will not be the same (inverted duck foot shape): this can be measured by

comparing the distance between centre of gravity in the red and green channels.

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