A10011-ASM-T53-EN-Spec-TX-micron-DMS - 第24页
24 SIPLACE Vision PCB position recognition Fiducial criteria Fiducial criteria Locate 2 fiducials Locate 3 fiducials X-/Y -position, rota tion angle, mean PCB distortion Additional: sh earing, dist ortion separately in X…
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SIPLACE Vision
Cracked Die and Chipping Inspection
Crack Die Detection
The cracked die inspection
can detect breaks before
removal from the tape, if the
crack runs between two
outer edges of the die.
Inspection is performed
with the PCB camera. A
prerequisite for detection is
that the two parts of the die
are slightly inclined towards
one another. Detection is
possible via the differing
reflection angles of the two
surfaces which are inclined
towards one another.
Chipping Detection
Chipping detection allows
you to recognize chipped
areas on semiconductor
components.
Good
Bad
24
SIPLACE Vision
PCB position recognition
Fiducial criteria
Fiducial criteria
Locate 2 fiducials
Locate 3 fiducials
X-/Y-position, rotation angle, mean PCB distortion
Additional: shearing, distortion separately in X and Y direc-
tion
Fiducial shapes Synthetic fiducials: circle, cross, square, rectangle, dia-
mond, circular, square and rectangular contours, double
cross, pattern: any
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
Dimensions of synthetic fiducials
Min. X/Y size for circle
a
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 diamond 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 all fiducial shapes 3 mm
Max. bar width for cross/double-cross 1.5 mm
Minimum tolerances generally 2% of nominal dimension
Max. tolerances generally 20% of nominal dimension
a) To ensure high production quality of printed circuit boards, a minimum x/y size of 0.075 mm is permitted
for circular fiducials under the following conditions:
There are no other objects with a size of + 0.2 mm which are visible in the rectangular fiducial search
area. Example: Circular fiducials with an x/y size of 0.075 mm need a search area without visible objects
of: 0.075 mm + 0.2 mm = 0.275 mm.
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SIPLACE Vision
PCB position recognition
Technical Data and Inkspot Criteria
Ink spot criteria
Methods • Synthetic fiducial recognition method
• Mean gray scale value
• Histogram method
• Pattern recognition
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 inkspot.
If this is present during the
measurement via the PCB
vision module, the corre-
sponding subpanel will not
be populated.
This function helps prevent
unnecessary costs caused
by placement of defective
panels.
Technical data for PCB position detection
PCB fiducials
Local fiducials
Library of bad panel recognition
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
Illumination type Front lighting
Fiducial recognition time 0.1 s
Field of vision 5.78 mm x 5.78 mm