Optics: measuring and testing – Inspection of flaws or impurities – Containers or enclosures
Patent
1981-03-30
1983-10-25
Corbin, John K.
Optics: measuring and testing
Inspection of flaws or impurities
Containers or enclosures
250223B, G01N 2190
Patent
active
044115229
ABSTRACT:
The present Specification describes an apparatus for the inspection of translucent containers comprising a conveyor (10) for transporting a container (12) through an inspection zone, and means (15, M1,M1,M3) for directing a plurality of light beams (B1,B2,B3) sideways at the container during its movement through the zone. Each light beam is directed at the side of the container from a different direction relative to the container, and deflection means cause each of the beams to repeatedly scan the side of the container in a vertical direction as the container moves fully through each beam. A respective opto-electronic light collector (L1,L2,L3) is provided for each beam for providing a respective signal S representing the amount of light falling thereon from the respective beam after transmission through the container, and signal processing circuitry (40) is associated with each light collector to examine the signal therefrom according to a predetermined criterion to generate a fault-indicating signal (41) when such criterion is fulfilled. Means are provided for allocating to each beam a respective area of the container sidewall for which any such fault-indicating signal can be regarded as resulting from an actual fault rather than from a characteristic of an acceptable container, and any fault-indicating signal generated when the respective beam is not scanning the allocated area of the container sidewall is suppressed.
In one embodiment the scanned area of the sidewall of the container allocated to each beam is a rectangle defined by the duration of a gating signal and the scan height of the beams.
In a second embodiment, however, the allocated area of each beam is defined by a random access memory (42) having stored therein binary information identifying those regions of an acceptable container from which fault-indicating signals may be generated according to the said criterion even in the absence of a fault.
REFERENCES:
patent: 3684385 (1972-08-01), Einfalt et al.
patent: 3932042 (1976-01-01), Faani et al.
patent: 4140901 (1979-02-01), Fischer et al.
patent: 4280624 (1981-07-01), Ford
O'Connor Brendan F.
Phillips John O.
Webb Charles M.
Corbin John K.
Koren Matthew W.
Udaras Na Gaeltachta
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