Method and apparatus for inspecting sidewalls of bottles using s

Details Method and apparatus for inspecting sidewalls of bottles using s Method and apparatus for inspecting sidewalls of bottles using s

1989-05-26

1991-04-02

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356240, G01N 904

Patent

active

050049097

ABSTRACT:
A method and an apparatus for inspecting the sidewalls of bottles are disclosed. The sidewall of a bottle to be inspected is illuminated by a light in a pattern of stripes. At least three near points in an image of lights transmitted through the sidewall which are selected along a scan line are compared in brightness. When the central one of the three points to be noted has a brightness differing from the other near points on both sides of the noted point by more than a set value, the noted point is detected as a defect point. Based on the thus detected defect point, the presence of a defect on the sidewall of the bottle is judged. The method and the apparatus for inspecting the sidewalls of bottles can detect refractive defects as well as light-blocking defects with high precision.

REFERENCES:
patent: 4376951 (1983-03-01), Miyazawa

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