Try a system made by Vision Engineering, which uses a camera and
lenses to view different sides of a component with a very slick
system. CA Number is 714-974-6966, CT number is 860-355-3776. I've
uses the system $35K and it is great for visual inspection
______________________________ Reply Separator _________________________________
Subject: Assisted visual inspection of fine-pitch solder connections
Author: [log in to unmask] at _internetcc
Date: 12/6/96 9:14 AM
I was recently asked to help evaluate two systems designed to assist in
visual inspection of solder connections on board assemblies. Both use a TV
camera and automatic X-Y positioning. The latter is important help an
inspector identify a particular connection of a fine-pitch component that
may have fifty or more connections on a side. One, made by Omron, uses a
patented arrangement of three concentric ring lights, each of a different
color. The colored reflection pattern allows interpretation of the fillet
contour. The other, made by I Systems, uses a motor-driven mirror to allow
inspecting connections from any angle, although the TV camera remains
oriented to look straight down.
I found things I liked and things I didn't like about each system, and I got
to wondering whether there might be other commercially available systems not
a whole lot more expensive than these two (say ~ $50K), which we should
evaluate as well. In particular, I find that a TV camera results in a poorer
image quality than conventional optics, and would recommend just using a
microscope, looking at connections at a variety of orientations, if it
weren't for three difficulties with fine-pitch parts: identifying the pin
number, holding the assembly still enough to interpret what's there, and
getting a good view of heel fillets.
Of course, we could try to get our customer to change our acceptance
requirements so that a connection that looks OK to the camera is OK, but
we're not sure we could do that. Also, it may not be necessary to identify
the exact pin number but only to report the approximate location to help the
rework operator to find it.
Comments?
Gordon Davy
Northrop Grumman ESSD
Baltimore, MD
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