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Spatial Filtering System for Inspection and Verification Disclosure Number: IPCOM000036829D
Original Publication Date: 1989-Nov-01
Included in the Prior Art Database: 2005-Jan-29

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Watts, KW [+details]


A technique is described whereby an optical spatial filtering system is used in the inspection and verification of via hole patterns, as used in printed circuitry, to: a) detect the presence or absence of holes, b) accurately gauge the size of each hole, and c) determine if the hole is contaminated or defective.