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Inspection device

  • US 4,676,650 A
  • Filed: 11/18/1983
  • Issued: 06/30/1987
  • Est. Priority Date: 11/18/1983
  • Status: Expired due to Fees
First Claim
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1. A method for inspecting a liquid-filled transparent container for foreign particles in the liquid com- prising:

  • a. placing the container at an inspection station,b. rotating said liquid about an axis while holding said container stationary,c. illuminating said container with a first lighting means comprising two light beams which intersect within said liquid and delineate an angular shadow zone radiating outwardly from said container,d. illuminating said container with a second lighting means which is positioned intermediate the two light beams of said first lighting means, said second lighting providing a light zone within said shadow zone and means having a lower intensity than said first lighting means,e. viewing said container with a viewing means positioned in said shadow zone of the first lighting means and within the light zone of the second lighting means to detect the presence of foreign particles.

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