Method and apparatus for optical inspection of transparent articles
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United States of America Patent
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Oct 28, 1986
Grant Date -
N/A
app pub date -
Jan 15, 1985
filing date -
Jan 17, 1984
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and an apparatus for optical inspection of transparent articles. The method and apparatus use a light beam scanning field which is separated into at least two portions. The field portions are directed at the article at differing angles of incidence such that they eliminate blind spots caused by portions of the apparatus which block the passage of the light through the article. A feature of the invention is its provision of a folded optical path to increase the length the beam travels between the beam generator and the object beyond the physical distance between the beam generator and the object.
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