Smart Gui - Algorithm Training Material_rev1.pdf - 第137页

Copyright © ViT rox All Rights Reserved . Lead Ringer - T ypes of Ringer T ests 8. T oe Fillet Shape Differs • Anchor set to (Lead T ip anchor) • Image Plane: max(Angle 1, Angle 3) • Software measure the mean intensity o…

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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Lead Ringer - Types of Ringer Tests

8. Toe Fillet Shape Differs

• Anchor set to (Lead Tip anchor)

• Image Plane: max(Angle 1, 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

• The solder shape varies if the lead is lifted and this is what we are looking for here. We are using a lead tip

anchor an not a pad anchor, in case the pad anchor found is not reliable enough to the diverse process

conditions.

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Lead Ringer - Types of Ringer Tests

9. Green Box Bend Differs

• This preset is a variant of Preset 3 - Shoulder Bend Differs but placement should be more consistent.

• Anchor set to (Green Box Inner Edge anchor)

• Image Plane: Angle 1

• 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 lifted (heavily) or bent, the lead will be visibly deformed: the shoulder will appear brighter in the

current region of interest.

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