Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1982-12-30
1986-04-22
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356240, G01N 904
Patent
active
045844690
ABSTRACT:
A method and apparatus for inspecting a translucent container to detect a radial reflective defect in the container is disclosed. The apparatus comprises means for illuminating a container by focusing a radiant beam of light into an elongated image extending in a direction parallel to the longitudinal axis of the container along a portion of the container being inspected. The apparatus also comprises means focused on the illuminated portion of the container for sensing the intensity of light reflected from the illuminated portion and for viewing the illuminated portion from a direction and forming an angle ranging from about 75 degrees to about 105 degrees from a path of the incident beam of light. The sensing means provides a plurality of the electrical signals each proportional to the reflected intensity from a corresponding position on the illuminated portion of the container. The apparatus also comprises means responsive to the plurality of electrical signals for providing a reject signal when one of the plurality of electrical signals exceeds a predetermined threshold in response to the presence of a reflective defect.
REFERENCES:
patent: 3171033 (1965-02-01), Mathias
patent: 3974378 (1976-08-01), Brugger
patent: 4136930 (1979-01-01), Gomm et al.
patent: 4171481 (1979-10-01), Mima et al.
patent: 4280624 (1981-07-01), Ford
patent: 4338028 (1982-07-01), Tailleur et al.
patent: 4467350 (1984-08-01), Miller
Gatto J.
Nelms David C.
Nelson John R.
Owens--Illinois, Inc.
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