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US 4,306,808 AGranted
Glass flaw inspection system
AssigneeFord Aerospace & Communications Corporation
InventorRichard D. Vander Neut
Life of this patent
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Abstract
For inspecting a float glass ribbon for flaws an optical flaw detection system utilizing a laser beam which linescans the surface is provided. The laser beam is made incident to the glass ribbon at a high angle of incidence with respect to the normal. Deviation of the light transmitted through the glass ribbon is used as an indication of a defect. The invention is particularly useful for detecting "tin drip" type defects.
Claims9
A glass flaw inspection system comprising:
- means for transporting a sheet of glass past a predesignated inspection point;
- means for directing a beam of visible electromagnetic radiation to be incident on to a first surface of said glass at an angle greater than 45.degree. at said inspection point;
- first means for detecting said incident radiation transmitted through said glass along a predetermined path;
- second means for detecting said incident radiation transmitted through said glass along paths diverting from said predetermined path.
1 more element
Dependencies are inferred from the claim text.