Safe detection of hidden faults
Safe detection of
hidden faults
Layout independent fault detection by AOI systems with
high-end angled-view inspection
Jens Kokott, Manager AOI/AXI systems, GOEPEL electronic GmbH
The application of AOI systems is necessary brings with it several boundary conditions
AOI systems are an for the inspection of the solder joints at that also influence the overall process of
essential element in the PLCC components and offers a higher in-
the automated optical inspection. Besides
PCB production process in
spection quality for pins of all kinds of IC an increased expenditure of time due
order to guarantee a reliable
components (e.g. SO, QFP, etc.). Regarding
to additional image capturing, and the
quality assurance. The user
the last-mentioned solder joint type, an
considerably smaller field of view, the
can choose from a variety
orthogonal inspection is possible; however
arrangement of components on a PCB can
of system options, which
the layout at the solder joint has a crucial
constrict the view of the inspected solder
influence on the reliability of detection.
joint even with angled-view inspection.
are characterised by diverse
In this matter especially, EMS providers
Taking into account all these
performance parameters
face the difficulty of not being able to
particularities, GÖPEL electronic GmbH
so that a broad spectrum
control the design of the pads or the
developed the rotating angled-view module
of quality demands can be arrangement of components; hence the
“Chameleon” which allows, together with
satisfied. For optimal fault
consideration of layout guidelines remains
an intelligent verify function, reliable,
detection with independence
an illusion. To put things right, an angled
layout-independent fault detection.
of the PCB layout and the
view can provide image information
In the following paragraphs, the
for additional analyses. However, this
application of this innovative development
assembly parameters, a high-
additional viewing direction should not
is explained, especially in regard to the
end, angled-view inspection is
be considered a remedy for increasing the
detection of lifted leads in various layout
indispensable.
quality of detection, because its application
and assembly situations.
Keywords: AOI, Inspection,
Fault Detection, Angled View
Figure 1. Covering of IC pins by THT components with conventional angled-view inspection.
10 – Global SMT & Packaging – October 2009
www.globalsmt.net
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