Optics: measuring and testing – Inspection of flaws or impurities – Containers or enclosures
Patent
1998-11-24
2000-05-16
Rosenberger, Richard A.
Optics: measuring and testing
Inspection of flaws or impurities
Containers or enclosures
G01N 2100
Patent
active
060644796
ABSTRACT:
A method and device for the accurate manual illumination inspection of transparent containers, such as pharmaceutically injectable vials, for particle contamination with light and dark particles. Opposing positioned and spaced first and second illumination sources are provided on opposite lateral sides of the container, with the container being positioned in an inspection volume at the illumination and physical midpoint (lumen light balance) between the illumination sources. A third illumination source with a diffusion screen is provided behind the inspection volume and container. Light from the opposing first and second light sources lateral to the container effects light reflection and scattering from white or light colored particles within the container and light from the third illumination source is visibly extinguished or blocked from reaching the inspector by black or dark colored particles. Prior art contrast inspections with light and dark colored backgrounds are effectively and more efficiently combined in a single illumination inspection without the use of such different contrast enhancing backgrounds.
REFERENCES:
patent: 5864395 (1999-01-01), Laurberg
patent: 5940176 (1999-08-01), Knapp
Nissenbaum Israel
Rosenberger Richard A.
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