DEK INFINITY USER MANUAL - 第243页
INFINITY ',163(& 7,21 02'8/( 29(59,(: Soft ware Ver sion 7 User Manual 8.3 There is no provision to select sites to be pre-image d individually . All sites are pre-imaged once (one) or every cycle (eve r…
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8.2 User Manual Software Version 7
Figure 8-1 Paste on Board and Stencil
Using blockage and paste present information, the system can calculate the
following:
• Paste Volume - volume of paste on the board.
Operation Board and stencil inspection is licensed as a separate feature for each, and
specifies the maximum level of inspection which may be selected. The levels
of inspection for either feature against inspection type is detailed in the follow-
ing table:
NOTE
Board Inspection when set to Advanced, checks for paste on and off the pad.
An item only appears in a window while it is appropriate to the current inspec-
tion type. In particular, Paste Volume is only calculated and displayed whilst the
level of inspection is set to Advanced for both the board and the stencil.
Pre-images Board inspection is achieved by image comparison. Therefore prior to printing,
the camera visits all programmed sites to capture images of the bare sites.
This captured image, called a Pre-image, is taken for every site setup. The two
available parameter settings for capturing Pre-images is:
• One - Pre-image captured on the first board in a batch only.
• Every - Pre-image captured on every board of a batch.
Paste on Stencil (Smear)Paste on Board (Bridging)
Paste on
Pad
Stencil
Aperture
Board Pad
Alignment
Volume
Top of Board
Stencil (Underside)
Paste in
Aperture
(Blockage)
Inspection Type Board Inspection Stencil Inspection
None No Inspection No Inspection
Basic Paste on Pad Blockage
Advanced Paste on Pad
Bridging
Alignment
Paste Volume Prediction
Blockage
Smear
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Software Version 7 User Manual 8.3
There is no provision to select sites to be pre-imaged individually. All sites are
pre-imaged once (one) or every cycle (every).
NOTE
A new batch may be started when the machine is switched ON/OFF or a product
file being re-loaded.
Light Calibration The stencil image is captured once only, (as this does not change throughout the
printing process). When the first board enters the machine, the camera visits all
sites and stores the size and shape of the apertures. This is a one time operation,
therefore the stencil must be clean.
Board Inspection The various board inspections are shown below.
NOTE
Uneven tinning of the board and/or misaligned solder mask may be seen as
paste, which could cause false readings. DEK’s Green camera and lighting
setup can eliminate this effect.
The pad on a selected board site is
learnt as a reference for comparison
with inspected sites.
Since the area of the pad is learnt,
and the area of paste can be
recognized, any change in pad area
must be paste. Hence the area of
paste present can be calculated with
respect to the aperture size.
The centre of the paste is compared
to the centre of the pad to produce
alignment error information in X and Y.
Since the area of paste can be
recognized, the distance between
two areas of paste (bridging) can
be calculated.
Pad
Board
Paste
Clean Board
Paste Present (Basic)
Alignment (Advanced)
Bridging (Advanced)
X
Bridging Distance
Y
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8.4 User Manual Software Version 7
Stencil Inspection The various stencil inspections are shown below. (Histogram information is
detailed on this page.)
Histogram The vision card analyses the grey scale levels of the pixels that make up the site
image. From this information a histogram is produced, this can be used as a
visual aid to setting up lighting for 2D inspection.
Any change to the area of the
stencil must be paste, hence the
area of smear can be calculated.
This is relative to the area of
white lost in the histogram.
Smear (Advanced)
The position and area of
apertures within the stencil site
are learnt as a reference.
Aperture
Stencil
Clean Screen
Histogram
Any change to the area of the
aperture must be paste, hence
the percentage of blockage can
be calculated. This is relative to
the area of black lost in the
histogram.
Blockage (Basic)
Paste
Paste
Stencil Histogram
Black
StencilAperture
Paste
White
Grey Scale Level
Board Histogram
Number
of
Pixels
Number
of
Pixels
Black
PadBoard
Paste
White
Grey Scale Level