SIPLACE Vision Customer_en - 第83页
Component Shapes Optical Recognition and Evaluation of Leaded COs Specific Component Shapes S tudent Guide SIPLACE Vision (Customer) Edition 12/2008 EN Component Shapes 83 5.3.8.2 Recognition of V ery Wide Leads Heat sin…
Component Shapes
Specific Component Shapes Optical Recognition and Evaluation of Leaded COs
Student Guide SIPLACE Vision (Customer)
Component Shapes Edition 12/2008 EN
82
Inspection step Lead position in group 1
In this step, the lead gray value profile (green) is
determined for the region inside the red group
window.
In this step, the lead gray value profile (green) is
determined for the region inside the red group
window.
Determination of the lead end edge is also
performed, although this will not be shown in the
diagram.
Recognition step Features OK
The lead outer edges are searched for in the blue
window.
The measured lead pitch is marked by the green
crosses at the lead ends.
This is marked on the lead outer edge line in the
analysis presentation.
The green tick shows the determined CO center.
Features which - for whatever reason - were not
recognized, are marked as such in the Features
faulty menu, (in red).
Result of centering with inspection
Component Shapes
Optical Recognition and Evaluation of Leaded COs Specific Component Shapes
Student Guide SIPLACE Vision (Customer)
Edition 12/2008 EN Component Shapes
83
5.3.8.2 Recognition of Very Wide Leads
Heat sink (tab) and ground connection leads are often produced as overwide leads. They need to be
included in the programming, otherwise the angle calculation step will deliver incorrect results, if there
are too few leads on the opposite side or if the lead rows are too short.
Recognition step Coarse position 1
This step measures the outer edges (1) with the
help of brightness evaluation, performed vertically
to the lead in the region around the light blue Vs.
This step also determines the lead center (2) at the
outer edge in the left measurement window (the
same procedure is used for coarse/fine position 2
in the right-hand window).
Finally, the left side edge is determined. The
procedure here is to set the image point pairs so
low that the normal slant of the side edge is not
included in the measurement.
Recognition step Fine position 1
Several point pairs are now used to determine a
fine position and fine angle, within the position
defined during the step Coarse position1.
As described for SO components, the same
process is applied to the leads in group 2.
Lead inspection is then performed for the
recognized lead positions.
Component Shapes
Specific Component Shapes Optical Recognition and Evaluation of Leaded COs
Student Guide SIPLACE Vision (Customer)
Component Shapes Edition 12/2008 EN
84
Lead inspection of tab (heat sink) in
recognition step Lead tip1
The yellow areasmark the results window (1)
with brightness and gradient characteristics.
The red measurement window is where the
brightness is determined from bottom to top. This
is then entered in the results window (light green)
from left to right.
The brightness gradient (alteration) is used to
calculate the position of the lead outer edge
(orange).
Lead inspection of tab (heat sink) in
recognition step Lead width1
The system scans the red measurement window
in a horizontal direction, searching for regions of
brightness (light green ). The evaluation and
marking of results will be displayed accordingly, as
in the diagram.
Lead inspection is performed as described for SO
components.