Optics: measuring and testing – Inspection of flaws or impurities – Transparent or translucent material
Patent
1996-09-20
1998-03-10
Font, Frank G.
Optics: measuring and testing
Inspection of flaws or impurities
Transparent or translucent material
356430, G01N 2100, G01N 2184
Patent
active
057267499
ABSTRACT:
An apparatus and method for inspecting pieces of glass and other transparent sheets for optical defects is provided. The inspection apparatus can be integrated directly into the production line. The inspection apparatus includes an electro-optic inspection of the total viewing area for each transparent sheet as the sheets are conveyed at the end of the production operation. The apparatus includes a plurality of laser light sources positioned on one side of the sheet of glass or other transparent material, and a corresponding plurality of lenses and photosensitive position detectors on the opposite side. Light beams are directed from the light sources through the transparent sheets to the lenses and the detectors. The angular deviation of each light beam which occurs as the light beam passes through the sheet generates a signal at each of the detectors. The signals generated by the angular deviation of the light beam from the optical axis are processed by a computer system to provide information regarding the angular deviation values for the transparent sheet. The distortion, determined by the rate of change of the angular deviation, is calculated and compared to preset distortion values to determine if the transparent sheet is acceptable from a quality standpoint.
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Font Frank G.
Libbey-Owens-Ford Co.
Merlino Amanda
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