SIPLACE Vision Customer_en - 第107页
Component Shapes SIPLACE Vision Robu stness Display New SIPLACE Vision Functions for 605 and 701 Statio n SW S tudent Guide SIPLACE Vision (Customer) Edition 12/2008 EN Component Shapes 107 The opposite error situation, …
Component Shapes
New SIPLACE Vision Functions for 605 and 701 Station SW SIPLACE Vision Robustness Display
Student Guide SIPLACE Vision (Customer)
Component Shapes Edition 12/2008 EN
106
5.4.2.5 Scale or FeatureSize
For CHIP and MELF components shape and feature size values are directly connected. The shape
widths correspond to the leg widths, the shape lengths in X direction determine the offset for leg groups
at a given leg length. For this reason both checks are discussed together.
If the faulty measurement result is opened, each measurement step that could fail in this robustness test
can be selected.
The correction of the X dimension from 5.8 mm to 5.7 mm has the effect that the reduced component
charge will be detected because it is inside the 0.4 mm size tolerance after the correction.
5-8: Original component shape size "measurement result"
The mechanical dimension in Y direction (vertical)
was correctly programmed, which can be
recognized in the congruence of the programmed
outline and the shape edges of the component.
In contrast, the X dimension is a bit too large. But
this has no unfavorable effect on the
measurement result.
A smaller component, however, would be rejected
because of a size error.
5-9: Reduced component shape size X dimension check
As can be seen in the X dimension inspection
step, the recognition of the shape edge for
reduced component dimensions fails on the right
side of the component. The red line shows the
recognized shape edge which is located outside
the position tolerances marked with a green line.
Component Shapes
SIPLACE Vision Robustness Display New SIPLACE Vision Functions for 605 and 701 Station SW
Student Guide SIPLACE Vision (Customer)
Edition 12/2008 EN Component Shapes
107
The opposite error situation, when the dimensions selected are too small:
5-11: Size programming error in the original result and as an effect of the "size check"
These robustness size checks applied to component shape types with leads show possible small
deviations of the feature geometries.
5-10: Corrected reduced component size X dimension check
The shape edge is now found within the 0.4 mm
tolerance in inspection step X dimension.
Component Shapes
New SIPLACE Vision Functions for 605 and 701 Station SW SIPLACE Vision Robustness Display
Student Guide SIPLACE Vision (Customer)
Component Shapes Edition 12/2008 EN
108
5-12: FeatureSize test
As can be seen in this zoomed view, the lower central lead is a bit too big. With an 8% zoom of the
component shape, image filter size and tolerance don't suffice to detect this lower central lead.
Zoom factors are adapted when the geometry is changed, which can be seen when comparing these
two displays.
The solution for detecting this lead with its oversized width is to increase the lead width from 0.32 mm to
0.35 mm and to reset the tolerance to 20%.
Looking at the following BGA example it is not possible to see doubtlessly that the ball diameter is
programmed too small in the original optical centering (only visible with higher zoom).
5-13: Ball diameter
Legend
1. The ball diameter, which is programmed with 0.6 mm in this case, only fits in the original
measurement.
2. A correction to 0.65 mm ball diameter supplies correct results for all 6 feature size measurements.