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Proceedings Paper

Custom Fixed-Focal Length Versus Zoom Lenses
Author(s): Richard Mills; David Stoltzman
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Paper Abstract

Automated optical inspection (A0I) technology has become vital in the printed wiring board (PWB) industry. AOI systems inspect automatically by scanning to acquire an image, processing the image to detect flaws, and displaying flaws to the operator for rework or rejection. AOI reduces costs by reducing scrap and improving yield. AOI systems pay for themselves by catching defects as early in the manufacturing process as possible: Before flawed artwork is used to print, before good layers are laminated with bad, before misdrilled boards are populated. The AOI-PWB industry places severe demands on optics technology. Features as small as six mils must be imaged clearly and registered exactly, and flaws as small as one mil can be fatal. We shall discuss how optics can be optimized for AOI;in particular, we shall explain the distinct advantages of fixed-focal length lenses over zoom lenses, and of custom lenses over general-purpose lenses.

Paper Details

Date Published: 7 March 1989
PDF: 4 pages
Proc. SPIE 1005, Optics, Illumination, and Image Sensing for Machine Vision III, (7 March 1989); doi: 10.1117/12.949026
Show Author Affiliations
Richard Mills, Applied Vision Systems, Inc. (United States)
David Stoltzman, APA Optics, Inc. (United States)

Published in SPIE Proceedings Vol. 1005:
Optics, Illumination, and Image Sensing for Machine Vision III
Donald J. Svetkoff, Editor(s)

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