Method and apparatus for illuminating and imaging a can end coated with sealing material
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United States of America Patent
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Sep 8, 1998
Grant Date -
N/A
app pub date -
Jan 11, 1996
filing date -
Jan 11, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A can end to be inspected, including a portion coated by a sealing material, is illuminated by polarized light. The light reflected from the object and sealing material is viewed by a camera through a polarizing filter. The polarizing filter blocks out polarized light reflected by the can end and sealing material that does not contain any defects, but passes light reflected by the sealing material that has been depolarized by a defect in the sealing material.
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