Method of and apparatus for detecting defect of transparent shee

Details Method of and apparatus for detecting defect of transparent shee Method of and apparatus for detecting defect of transparent shee

1996-02-08

1997-11-25

Font, Frank G.

Optics: measuring and testing

Inspection of flaws or impurities

Having predetermined light transmission regions

356430, 250562, 250563, G01N 2100

Patent

active

056918119

ABSTRACT:
A method of detecting a defect of a transparent sheet is provided in which light source casts light on a transparent sheet through a slit plate, a camera receives the light transmitted through the transparent sheet and produces an image for inspection of a defect, an image of the slit plate produced by the camera is out of focus and represented by a waveform which is representative of brightness of the light transmitting portions and shading portions of the slit plate, and the camera is set to focus on a point where the difference between a maximum brightness and a minimum brightness represented by the waveform becomes minimum or on a point adjacent thereto. An apparatus for detecting a defect of a transparent sheet is also provided.

REFERENCES:
patent: 5452079 (1995-09-01), Okugawa

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