fiducial mark


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Related to fiducial mark: fiducial point

fiducial mark

In surveying, an index line or point, used as a basis of reference.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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The basic idea is to create a non-reversal pattern with two or three fiducial marks on the board or panel.
What makes a good fiducial? It all comes down to contrast and positional accuracy
Such results of inner orientation do not meet the required accuracy of 0.007 mm (Kraus 2000) for measuring the accuracy of fiducial marks.
Scanning aerial photos using a non-professional scanner
For this aim discovering and recognition of IC photo masks fiducial marks (FM) with automated optical positioning system help is proposed.
In fig.1 are shown IC photo masks (fig.1, a), fiducial marks region (fig.1, b) and HWT application result (fig.1, c).
The integrated circuits photo masks images alignment for automated optical inspection system
PR enables a wire bonder to easily identify fiducial marks and other alignment features.
The benefits of good 'PR': teaching the wirebonder pattern recognition
ONE OF THE handy aspects of getting boards assembled at Screaming Circuits is we don't require fiducial marks for standard process boards.
The boards didn't have any fiducial marks. Normally, we find a via hole, through-hole pin hole or some similar feature to use as a fiducial.
Fiducials and odd boards: not all boards need fiducials, but they do come in handy on challenging boards
Fiducial marks should not be obscured by equipment rails (placing them a minimum of 0.100" from edges is adequate in most cases).
High-reliability manufacturing: tips on design for manufacturing and BGA reballing
Fiducial marks are established for the inspection process with x and y parameters.
Feinfocus' WBI-Fox x-ray: dynamic void detection in wafer bumps, without gray level definition
When you design your next board, do not forget the fiducial marks. Surprisingly, a lot of boards still have no fiducial marks, and, without them, consistent placements are almost impossible.
Component placement
When removing the defective board, avoid and preserve score lines, tooling holes, fiducial marks, impedance coupons and trace lines to meet the requirements of the manufacturer's blueprints.
X-out board replacement: don't let one bad board spoil the whole bunch

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