Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1978-11-20
1981-02-03
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
209526, 356240, G01N 2151
Patent
active
042490758
ABSTRACT:
Apparatus for inspecting glass containers to determine the presence of the defect termed "birdswing". A container under inspection is rotated and a laser is directed so as to pass through the opening defined by the finish of the container and toward the base of the container. If no birdswing is present the laser beam will pass through the bottom of the container. However, if a birdswing is present, the rotation of the container will cause the laser beam to eventually strike the birdswing, causing scattering of the laser beam. The scattered light is detected by a circumferential photocell array which is positioned below the base of the container. The location of the array is such that it will not detect any of the laser light unless it strikes a birdswing. The detection of scattered light by the photocell array causes a reject signal to be generated. As an alternative to rotation of the container, an electro-optical scanner may be employed to direct the laser beam through the opening of the finish of the container in a generally conical scan with respect to the axis of the container and thereby inspect a major portion of the interior space of the container.
REFERENCES:
patent: 2753459 (1956-07-01), Fedorchak
patent: 3302786 (1967-02-01), Conrad
patent: 3328000 (1967-06-01), Rottman
patent: 3735144 (1973-05-01), Babunovic et al.
patent: 3894806 (1975-07-01), Remy et al.
patent: 4066363 (1978-01-01), Juvinall
Click M. E.
Innis D. T.
Nelms David C.
Owens--Illinois, Inc.
Westin Edward P.
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