Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1989-06-13
1990-09-25
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356240, G01N 2190
Patent
active
049595377
ABSTRACT:
A method and apparatus for inspecting a transparent container having a defect on the container bottom by monitoring and analyzing the light energy transmitted through the container bottom. A source of diffused illumination is provided to direct the diffused illumination through the container bottom for monitoring the light energy by camera. The diffused illumination is arranged to be directed in intensity greater through a peripheral region than through a central region of the container bottom so as to positively produce a pair of peak values in light energy distribution received by the camera along at least one dimension corresponding to a line or secant extending in a plane of the container bottom. A corresponding pair of positions having such peak values and spaced along the dimension is obtained as indicative of the opposed peripheral edges of the container bottom, which positions are then processed to provide a true center of the monitored image as corresponding to the center of the container bottom. Based upon thus determined center of the image, it is defined an inspection zone which is in exact coincidence with the actual container bottom and within the confines of which the monitored light energy is analyzed to detect a defect on the container bottom. Thus, the defect inspection can be made free from an erroneous background outside of the container bottom to give a reliable detection of a defect on the container bottom.
REFERENCES:
patent: 4256957 (1981-03-01), Ford et al.
patent: 4428673 (1984-01-01), Yoshida
patent: 4448526 (1984-05-01), Miyazawa
Kimoto Tetsuya
Nakagawa Masashi
Matsushita Electric & Works Ltd.
Westin Edward P.
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