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System for optically examining plastic card surfaces
   
Document Number
US Patent 6243162
Issued Date
June 5, 2001
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Abstract
In the optical examination of plastic cards, the latter are illuminated with focused light, which is mixed with a diffuse component, in order reliably to discriminate even relatively slight differences in the reflectivity of the surface sections.
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System for optically examining plastic card surfaces - US Patent 6243162 Drawing
Drawing from US Patent 6243162
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Number of Claims:
19
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Owner
Published
June 5, 2001
Application Number
09/297,779
Filed
July 16, 1999
US Classification
356/237.1  
Int'l Classification
G01N   21/88   (20060101)   G07D   7/12   (20060101)   G07D   7/00   (20060101)   G07F   7/08   (20060101)  
Examiner
Assistant Examiner
Priority Data
Sep 09, 1997 [DE] 197 39 328
USPTO Field of Search
356/237.1   356/237.2   356/71  
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