SIPLACE D4i 规格说明书英文版 - 第25页

25 Vision Sensor Technology PCB Position Recognition Bad Board Position Recognition Ink spot criteria Methods • Synthetic fiduci al recognition method • Mean grayscale value • Histogram method • Template matching Shapes …

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Vision Sensor Technology
PCB Position Recognition
Description
Different fiducial shapes
prove to be optimal depend-
ing on the condition of the
surface. Particularly advis-
able for bare copper surfaces
with little oxidation is the
single cross. Maximum
accuracy is achieved due to
the high information content.
Rectangle, square and circle
are less "informative" but
save space and can even be
used when oxidation is at an
advanced stage. Advisable
for tinned structures are
circle or square because in
this case the ratio of the fidu-
cial dimensions to the presol-
der thickness is particularly
favorable.
Fiducial criteria
Locate 2 fiducials
Locate 3 fiducials
X-/Y-position, rotation angle, mean PCB distortion
in addition: shear, distortion in X- and Y-direction separately
Fiducial shapes Synthetic fiducials: circle, cross, square, rectangle, rhom-
bus, circular, square, and rectangular contours, double
cross, any pattern
Fiducial surface:
copper
tin
Without oxidation and solder resist
Fiducial warp ≤ 1/10 of structure width, both with good
contrast to environment
Dimensions of synthetic fiducials
min. X/Y size for circle and rectangle: 0.25 mm
min. X/Y size for annulus and rectangle: 0.3 mm
min. X/Y size for cross: 0.3 mm
min. X/Y size for double-cross: 0.5 mm
min. X/Y size for lozenge: 0.35 mm
min. frame width for annulus and rectangle: 0.1 mm
min. bar width / bar distance for cross, double-cross: 0.1 mm
max. X/Y size for fiducial shapes: 3 mm
max. bar width for cross / double-cross: 1.5 mm
min. tolerances, general: 2% of nominal dimension
max. tolerances, general: 20% of nominal dimension
Dimensions of patterns
min. size
max. size
0.5 mm
3 mm
Fiducial environment Clearance around reference fiducial not necessary if there
is no similar fiducial structure in the search area
25
Vision Sensor Technology
PCB Position Recognition
Bad Board Position Recognition
Ink spot criteria
Methods • Synthetic fiducial recognition method
• Mean grayscale value
• Histogram method
• Template matching
Shapes and sizes of fiducials/structures for
synthetic fiducials
other methods
For dimensions of synthetic fiducials,
see page 24
min. 0.3 mm
max. 5 mm
Masking material good coverage
Recognition time depends on the method: 20 ms - 200ms
Description
In the cluster technology
each subpanel is assigned
an ink spot. If this is present
during the measurement via
the PCB vision module, the
corresponding subpanel is
populated.
With this function it is pos-
sible to eliminate costs due
to unnecessary population of
faulty subpanels.
Technical data for PCB position recognition
PCB fiducials
Local fiducials
Library memory for recognition
of bad panels
up to 3 (subpanels and multiple panels)
up to 6 for the Long board option (Optional PCB fiducials
are output by the optimization.)
up to 2 per PCB (may be of different type)
up to 255 fiducial types per subpanel
Image analysis Edge detection method (Singular feature) based on gray-
scale values
Lighting method Front lighting
Fiducial recognition time 0.1 s
Field of vision 5.78 x 5.78 mm
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SIPLACE Software
SIPLACE offers holistic solu-
tions based on modular soft-
ware tools for SMT machine,
line and production manage-
ment: the SIPLACE soft-
ware suite.
Product definition, opti-
mization and line control
Fast, fault-free introduction
of products and optimum
utilization of production lines
are essential to maximize
production output. The pro-
grams from the SIPLACE
software suite allow you to
easily program products,
fine-tune the programs you
have created and then find
the balance for them within
your SMT production lines.
Production monitoring &
process control
To achieve the production
targets that are set, it is
important to constantly moni-
tor and check the production
facilities. The SIPLACE soft-
ware suite contains monitor-
ing products tailored to suit
the user group. These signal
immediately if limits are
exceeded on the machine or
the production line.
Set-up verification &
traceability
Set-up errors lead to series
errors. The user-friendly
SIPLACE software programs
help you to avoid such
errors, and thus ensure high
quality in your electronics
production.
The benefits of the
SIPLACE software suite at
a glance:
• Fast programming and
error detection
• Reduces changeover
times and stoppages
• Ensures optimum utiliza-
tion of your production
line's productivity
• Real-time information
from the production area
• Incredibly fast distribution
of information
• Optimum use of resources
• Timely notification when
production materials need
to be re-ordered
• Coordination of mainten-
ance