80S-2080F480F4-680F5 User’s Manual - 第279页
5 Vision Functions SIPLACE 80S-20/F4/F4-6/F5 User’s Manual 5.5 Teach Fiducial Edition 03/98 from Software Version SR.404.xx 5 - 58 Line engine er sold er-stop la cquer wi ll exhi bit poor reflection charac teristi cs. Ho…
SIPLACE 80S-20/F4/F4-6/F5 User’s Manual 5 Vision Functions
Edition 03/98 from Software Version SR.404.xx 5.5 Teach Fiducial
Line engineer 5 - 57
5.5.4.2
High, Middle and Low Resolution
Options
When you select one of these options,
– the menu closes,
– the video image is shown with fiducial and search area, and
– header and footer with commentary, measurement results, key assignments and command sequences are
displayed.
Fig. 5.5.11 Teach fiducial menu, Change search area video image
Use the arrow keys to change the camera position. You can specify the step width by entering a number in
the range 1 - 6.
Use the + and - keys to move the fiducial boundaries and teach them at the same time. With the space bar
you can toggle between horizontal and vertical directions. With the Tab key you can toggle the field step
width between 1 pixel and 10 pixels.
Press Return to launch the teaching process.
The unique value appears on the screen as the measurement result. This may vary between
0 = unsatisfactory and
100 = very good differentiation capability.
Practice shows that a uniqueness value of at least 60 must be achieved.
Repeat the teaching process a number of times with changed field sizes. In this way you can optimize the
uniqueness value. Reducing the size of the search area to dimensions which are less than those of the
fiducial itself will increase the uniqueness value since the fiducial ends will for example when wetted with
Fiducial No. = 8 Uniqueness = 70
Blank: hor./vert.
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
- : smaller
+ : larger
5 Vision Functions SIPLACE 80S-20/F4/F4-6/F5 User’s Manual
5.5 Teach Fiducial Edition 03/98 from Software Version SR.404.xx
5 - 58 Line engineer
solder-stop lacquer will exhibit poor reflection characteristics. However you should not select too small a
field as this may impair the uniqueness of the fiducial among other things.
Press Esc to quit this option.
NOTE
However, if you wish to use a fiducial despite the fact that it has a low uniqueness value, you should
ensure that the fiducial has a good quality value (see ’Test Option’, Page 5 - 67.)
If the quality is bad as well, it would be better to select another fiducial (see ’Criteria for Creating Fiducials’
in Section 5.2.5 from Page 5 - 23.
Changing existing fiducials
During each teaching process the centering offsets are set to zero. If this is not done, optical centering with
the fiducial structure field boundaries will not be correct, the measurement results would be distorted.
5.5.4.3
Search Area
Option
The search area is a freely selectable field within the field of view of the camera.
NOTE
– Always select a size for the search area which will still also take into account tolerances in board
positioning.
– Make sure that there are no other structures within the search area as otherwise fiducial re-identification
could unnecessarily be made more difficult.
– Repeat the tests with different search area sizes. It may also be appropriate to optimize
the uniqueness value.
When you select the Search area option
– the menu closes,
– the teaching process is launched,
– the video image is shown with fiducial and search area, and
– header and footer with commentary, measurement results, key assignments and command sequences are
displayed.
SIPLACE 80S-20/F4/F4-6/F5 User’s Manual 5 Vision Functions
Edition 03/98 from Software Version SR.404.xx 5.5 Teach Fiducial
Line engineer 5 - 59
Fig. 5.5.12 Teach fiducial menu, Teach search area video image
Use the arrow keys to change the camera position. You can specify the step width by entering a number in
the range 1 - 6.
Use the + and - keys to move the fiducial structure boundaries and teach them at the same time. With the
space bar you can toggle between horizontal and vertical directions. With the Tab key you can toggle the
field step width between 1 pixel and 10 pixels.
Press Return to launch the teaching process.
The uniqueness value appears as the measurement results. This may vary between 0 (= unsatisfactory) and
100 (= very good) differentiation capability.
Practice shows that a uniqueness value of at least 60 must be achieved for fiducials and ink dots.
Repeat the teaching process a number of times with changed field sizes. In this way you can optimize the
uniqueness value.
Press Esc to quit this option.
NOTE
However, if you wish to use a fiducial despite the fact that it has a low uniqueness value, you should
ensure that the fiducial has a good quality value (see ’Test Option’, Page 5 - 67.)
If the quality is bad as well, it would be better to select another fiducial (see ’Criteria for Creating Fiducials’
in Section 5.2.5 from Page 5 - 23.
Fiducial No. = 8 Uniqueness = 70
Blank: hor./vert.
Tab : step width
Change search area
1..6 : x/y step
: y axis +
: y axis -
x/y step width = ...Direction = ...Field step = ...
Ret: teach
- : smaller
+ : larger
: x axis +
: x axis -