Apparatus for detecting faults in transparent objects
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United States of America Patent
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Oct 15, 1985
Grant Date -
N/A
app pub date -
Dec 13, 1983
filing date -
Dec 21, 1982
priority date (Note) -
Expired
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Abstract
In a detecting system adapted to detect foreign matters as faults of a glass bottle, between a projection path of a diffused light towards the object to be inspected and said object, a plane polarizing plate of a circular polarizer which includes the plane polarizing plate combined with a 1/4 wave plate is disposed at the side of a diffused light side, while, in a light path which causes light transmitted through the object to form an image on the photoelectric detector 6 through the lens, a detecting side circular polarizer which includes a 1/4 wave plate and a plane polarizing plate is placed. An output electric signal of the photoelectric detector is subjected to analog operation processing.
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