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7 Vision Systems S IPLACE 80S/F/G User’s Manual 7.5 Teaching the Fiducial Ed ition 07/97 from Software Version SR.010.xx 7 - 50 Line engine er Fig. 7.5.16 ● With the a rrow ke ys you ca n vary the position of the cam era…
SIPLACE 80S/F/G User’s Manual 7 Vision Systems
Edition 07/97 from Software Version SR.010.xx 7.5 Teaching the Fiducial
Line engineer 7 - 49
●
Search area parameters are
–
width
–
height
●
Parameters of color graduation (5 Sections)
–
10 parameter “IN” values
–
10 parameter “OUT” values
The parameters are stored in a list in the station computer. This list is initialized with default and current values
when the option “Enter fiducial number” is called.
If you modify a parameter, a teach command is generated in the machine controller (MC).
Only that parameter block will be added to the general parameters in the teach command which was modified.
For this reason four different teach commands are produced by the machine controller:
–
teach the template window.
–
teach the search area.
–
teach the color graduation and template window.
NOTE
When the color graduation is modified the fiducial is taught at the same time.
–
teach using default values
7.5.4.1 Options “Template high, medium and low resolution”
If you have selected one of these options,
–
the menu will disappear.
–
the video image will be displayed with the fiducial and template window.
–
the header and footer lines will be displayed with commentary, measurement result, keyboard assignment
and command sequences.
7 Vision Systems SIPLACE 80S/F/G User’s Manual
7.5 Teaching the Fiducial Edition 07/97 from Software Version SR.010.xx
7 - 50 Line engineer
Fig. 7.5.16
●
With the arrow keys you can vary the position of the camera. The increment can be specified by entering
the numbers 1 ... 6.
●
With the “>” and “<” signs you can shift the template window limits and teach simultaneously. Here you can
use the space bar to switch from the horizontal to the vertical direction. The field increments can be
changed from 1 pixel to 10 pixels and vice versa using the “TAB” key.
●
With “RETURN” the teach process is initiated.
The unique value is displayed on the screen as the measurement result. This can vary between
–
0 = inadequate and
–
100 = very good discrimination.
In our experience you should attain a minimum value of 60.
●
Run the teach process repeatedly with modified field variables. You can thereby optimize the unique value.
A reduction in the template window variable to dimensions which are smaller than the fiducial will increase
the unique value, since the fiducial ends will exhibit poor reflectivity when for example wetted with solder
resist. You should not, however, select too small a field as the clarity of the fiducial will also suffer as a
result.
●
With “ESC” you can quit this option.
NOTE
The relationship between uniqueness and quality factor for a fiducial is described in Section 7.5.3.2 Option
“New fiducial”.
Fiducial No. = 8 Uniqueness = 70
Blank: hor./vert.
< : smaller
Tab : field step
Template high res.
1..6 : x/y step
: x axis +
: x axis -
: y axis +
: y axis -
x/y step width = ...Direction = ...
Field step = ...
Ret: teach
> : larger
SIPLACE 80S/F/G User’s Manual 7 Vision Systems
Edition 07/97 from Software Version SR.010.xx 7.5 Teaching the Fiducial
Line engineer 7 - 51
Modification of existing fiducials
In every teach process the centering offsets are set to zero. If this is not done, optical centering with the tem-
plate limits will not be correct. The measurement result would be corrupted.
7.5.4.2 Option “Change search area”
The search area is a freely selectable field within the visual field of the camera.
@BOX = NOTE
— Select the size so that the search area still will not fail to take tolerances into account during board
positioning.
— Make sure also that there are no other structures within the search area as
otherwise fiducial reidentification will be made unnecessarily harder.
— Run the tests repeatedly using modified search area variables. You may be able to optimize the
unique value.
When the option “Change search area”is selected
–
the menu disappears.
–
the teach process is started.
–
the video image is displayed with fiducial and template window.
–
header and footer lines are displayed with commentary, measurement result, keyboard assignment and
command sequences.