Apparatus for examining the mouths of bottles or the like

Details Apparatus for examining the mouths of bottles or the like Apparatus for examining the mouths of bottles or the like

1990-09-10

1991-12-10

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356240, 209526, G01N 904, G06M 700, H01J 4014

Patent

active

050721070

ABSTRACT:
Photographs for detecting defects in the upper end face of the lip (43) of the mouth are taken by a camera (18) arranged on the axis of a bottle to be examined. An annular, coaxial light-conducting member (30), which is surrounded by a light source (28), is disposed between the lip (43) and the camera (18). It has a central viewing opening (40) with the shape of a double truncated cone (40a,40b). The generated surface of the truncated cone (40a) adjacent to the lip forms a light exit surface (46a) to illuminate the lip (43). The angle of slope of the truncated cone (40a) is selected so that an annular truncated cone of light (52) falls on the upper face of the lip (43) and has an angle of incidence of about 45.degree. in the middle thereof. This results in a dark-ground illumination of the lip (43). Should a defect be present in the region of the upper end face of the lip (43), this becomes visible as light on a dark background. Lateral defects of the lip (43) can also be detected by an additional light-conducting member (34).

REFERENCES:
patent: 4026414 (1977-05-01), Ellinger
patent: 4498003 (1985-02-01), Cibis
patent: 4606635 (1986-12-01), Miyazawa et al.
patent: 4697076 (1987-09-01), Yoshida
patent: 4731649 (1988-05-01), Chang et al.
patent: 4945228 (1990-07-01), Juvinall et al.

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