Apparatus for detecting the presence of surface irregularities i

Details Apparatus for detecting the presence of surface irregularities i Apparatus for detecting the presence of surface irregularities i

1980-05-20

1982-06-22

McGraw, Vincent P.

Optics: measuring and testing

Inspection of flaws or impurities

Containers or enclosures

250223B, G01N 2101

Patent

active

043359604

ABSTRACT:
Apparatus for detecting the presence of surface irregularties in transparent articles, especially spikes on the inside base of glass containers.
The containers (5) are passed rotatably over a slit (7) having an opaque line (11) situated centrally about the longitudinal axis of the slit. A pair of light sources (15) are positioned beneath the slit and to either side of the opaque line (11) so that, in the absence of surface irregularities, light is refracted at an oblique angle through the container base. A diode-array camera (13) situated vertically above the slit and focussed thereon normally receives no light from the light sources. In the presence of a defect, diffraction of light occurs into the area of view of the camera causing a "defect present" signal to be produced which is processed electronically, enabling the defective container to be rejected.

REFERENCES:
patent: 3356853 (1967-12-01), Rottmann
patent: 3770969 (1973-11-01), Ansevin et al.
patent: 3887284 (1975-06-01), Gender et al.
patent: 4221867 (1980-09-01), McFadden

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