Horizon UserManualV6 - 第254页
Board Inspection The various board inspections are shown below. NOTE Uneven tinning of the board and/or misaligned soldermask can be seen as paste, which can cause false readings. This can be eliminated with the correct …
Screen Inspection The various screen inspections are shown below.
Software Version 6 User Manual 8.3
2Di INSPECTION
MODULE OVERVIEW
Any change to the area of the
screen 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 screen site are learnt as
a reference.
Aperture
Screen
Clean Screen
Histogram
Aperture
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)
Pa s t e
Pa s t e
Figure 8-2 Screen Inspection
Board Inspection The various board inspections are shown below.
NOTE
Uneven tinning of the board and/or misaligned soldermask can be seen as paste,
which can cause false readings. This can be eliminated with the correct lighting
setup.
8.4 User Manual Software Version 6
2Di INSPECTION
MODULE OVERVIEW
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.
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.
Pa d
Board
Pa s t e
Clean Board
Paste Present (Basic)
Alignment (Advanced)
Bridging (Advanced)
X
Bridging Distance
Y
Figure 8-3 Board Inspection
Shapes The inspection system uses shape recognition to inspect shapes other than
rectangles. A number of features can be inspected in one inspection, ie a row or
column of pads/apertures or a combination of features.
Software Version 6 User Manual 8.5
2Di INSPECTION
MODULE OVERVIEW
Column of Pads or Apertures
Shape Recognition
Combination of Features
Row of Pads or Apertures
Figure 8-4 Shape Types