Newsgroups: comp.graphics.algorithms,comp.robotics
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From: gsmiller@netcom.com (Shane Miller)
Subject: needed: algorithm for optical alignment of SMT/wafer parts
Message-ID: <gsmillerD1K8B3.E24@netcom.com>
Followup-To: poster
Keywords: optical CCD alignment SMT wafer
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
Distribution: usa
Date: Thu, 29 Dec 1994 06:49:50 GMT
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Xref: glinda.oz.cs.cmu.edu comp.graphics.algorithms:11574 comp.robotics:16580

i'm need some pointers of how commerical machine suppliers like
fuji or zevatech approach the problem of aligning SMT components
to fiducials on a PCB?

also of particular interest would be how can a CCD/software combo
be able to determine the orientation of a wafer.  most wafers
are round and thin but have a flat/shunted edge on them - like a
chord which cuts through the perimeter.  suppose a machine is to
pick one of these up in an unknown orietation and then place it
somewhere else in a know orientation (say with the flat at a 
0-180 deg. direction).

thanks ---
gsmiller@netcom.com

