Laser Scanning Based Image Acquisition Systems

Glenn Stutz

doi:10.1117/12.950982

1 May 1989 Laser Scanning Based Image Acquisition Systems

Glenn Stutz

Proceedings Volume 1036, Precision Instrument Design; (1989) https://doi.org/10.1117/12.950982
Event: SPIE Advanced Processing Technologies for Optical and Electronic Devices (colocated wth OPTCON), 1988, Santa Clara, CA, United States

Abstract

The trend toward fine line geometries coupled with advances in image processing make Automated Optical Inspection of printed wiring boards (PWB) an emerging technology. The inspection of the bare PWB is not a trivial task considering that for an 18 inch by 24 inch panel inspected at half-mil resolution represents a minimum of approximately 1.7 billion pixels that need to be processed. Parallel processing is utilized to push throughput data rates over 60 Mhz in present machines. A PWB inspection system will be described with emphasis on techniques used to preserve the critical pixel placements. Precision laser scanning tecniques form the basis of the image acquisition system. This opto-mechanical system is capable of consistently placing 1 mil spots along the scan line to within .1 mil accuracy in two axes. In order to attain this accuracy the polygon wobble and velocity errors need to be compensated. Several methods of active and passive correction will be evaluated demonstrating where each method is best utilized.

Citation Download Citation

Glenn Stutz "Laser Scanning Based Image Acquisition Systems", Proc. SPIE 1036, Precision Instrument Design, (1 May 1989); https://doi.org/10.1117/12.950982

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