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Two parameter visual inspection method and device

  • US 6,064,479 A
  • Filed: 11/24/1998
  • Issued: 05/16/2000
  • Est. Priority Date: 09/16/1996
  • Status: Expired due to Fees
First Claim
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1. A method for enhancing the reliability of an illuminated inspection of light and dark colored particles in a container in an inspection station wherein the inspection station comprises a first illumination source positioned on one side of an inspection volume in which the container is positioned, and which inspection volume is visually aligned with an inspector for inspection with illumination from the first illumination source;

  • said method comprising the steps of;

    a) providing a second illumination source on a second side of the inspection volume substantially directly opposite that of the first illumination source and substantially in line therewith;

    b) substantially visually aligning the inspection volume with an illumination midpoint between the first illumination source positioned on one side of the inspection volume and the second illumination source positioned on the side substantially opposite to the first illumination source relative to the inspection volume;

    c) providing a third illumination source behind the inspection volume relative to an inspector;

    d) directly illuminating the container with the respective illumination sources whereby the light from the first and second illumination sources is detectably reflected and scattered by light colored particles within the container and wherein light from the third illumination source is detectably blocked and extinguished by dark colored particles.

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