Distortion inspection apparatus of a glass plate

Details Distortion inspection apparatus of a glass plate Distortion inspection apparatus of a glass plate

1984-11-26

1987-03-03

McGraw, Vincent P.

Optics: measuring and testing

Inspection of flaws or impurities

Transparent or translucent material

250563, 250572, 358406, G01N 2188

Patent

active

046471979

ABSTRACT:
In a distortion inspection apparatus of a glass plate, a light and dark contrast pattern is sensed by an image sensor through a glass plate. The number of bits corresponding to a light or dark portion is detected from bipolar image data which are divided into a plurality of bits along each of parallel scanning lines assumed upon a surface of the glass plate. Then, a distortion state of the surface of the glass plate is discriminated in accordance with the differences among the thus detected number of bits and a reference value thereof. In such an arrangement, quantitative distortion discrimination can be performed.

REFERENCES:
patent: 2871756 (1959-02-01), Graves et al.
patent: 3688235 (1972-08-01), Migeotte
patent: 4076426 (1978-02-01), Gross et al.
patent: 4310242 (1982-01-01), Genco et al.
patent: 4461570 (1984-07-01), Task et al.

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