Optics: measuring and testing – Inspection of flaws or impurities – Containers or enclosures
Patent
1982-09-30
1985-02-19
Willis, Davis L.
Optics: measuring and testing
Inspection of flaws or impurities
Containers or enclosures
209525, 250223B, 356394, G01N 2190
Patent
active
045002037
ABSTRACT:
Apparatus for inspecting glass containers for irregularities in shape, wherein the containers are moved, in line, on a conveyor past a viewing station where there are three strobed light sources positioned at one side of the conveyor. One light is at 90.degree. with respect to the conveyor while the other two are at 45.degree. angles on either side thereof. Between the lights and the container being inspected are positioned Fresnel lenses; solid state discrete array cameras are positioned behind Fresnel lenses mounted on the opposite side of the conveyor with their viewing axes directed toward the light sources.
Each backlighted container is viewed by the three cameras simultaneously and provides a profile scan of the container at a plurality of planar elevations. These scans are processed and compared electronically with input data fed to a central processing unit. A second embodiment uses an anamorphic lens on each cameras which provides a convenient system for viewing tall bottles while also utilizing the full width of the viewing area by reducing the height to diameter ratio of the bottle image.
REFERENCES:
patent: 2798605 (1957-07-01), Richards
patent: 3549890 (1970-12-01), Keller
patent: 3787700 (1974-01-01), Chasson
patent: 3932042 (1976-01-01), Faani et al.
patent: 4064534 (1977-12-01), Chen et al.
patent: 4280624 (1981-07-01), Ford
Click Myron E.
Koren Matthew W.
Owens--Illinois, Inc.
Welch Gerald T.
Willis Davis L.
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