Method for measuring the degree of bending in a bent glass sheet

Details Method for measuring the degree of bending in a bent glass sheet Method for measuring the degree of bending in a bent glass sheet

1996-05-31

1997-10-21

Font, Frank G.

Optics: measuring and testing

By polarized light examination

With light attenuation

356377, 364559, 364560, G01B 1124

Patent

active

056802170

ABSTRACT:
The invention relates to a method for measuring the degree of bending in a bent glass sheet. The measuring is effected by cameras having a common imaging field within the boundaries of a surface being measured. The cameras are set at an arbitrary but stationary angle relative to each other. The glass surface along a profile to be measured is made visible to the cameras by an illuminating line whose light has a high intensity over the wavelength ranges of 250-330 nm. Hence, an extremely thin film of tin, left on the glass surface in the manufacture thereof, becomes visible.

REFERENCES:
patent: 4928175 (1990-05-01), Haggren
patent: 5424836 (1995-06-01), Weise et al.
patent: 5501717 (1996-03-01), Vehmas et al.

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