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

1993-06-25

1995-09-19

Mintel, William

Optics: measuring and testing

Inspection of flaws or impurities

Having predetermined light transmission regions

356429, 356430, 25055942, G01N 2189

Patent

active

054520797

ABSTRACT:
A light source casts light on a transparent sheet through a slit plate. A camera which is focused at a distance nearer than the transparent sheet or remoter than the slit plate, receives the light transmitted through the transparent sheet and picks up an image of a defect of the transparent sheet. An image processing unit inspects the image for a defect of the transparent sheet as "knots", "cords", etc.

REFERENCES:
patent: 3799679 (1974-03-01), Simko
patent: 3814946 (1974-06-01), Takahashi et al.
patent: 4492477 (1985-01-01), Leser
patent: 4647197 (1987-03-01), Kitaya et al.
patent: 5216481 (1993-06-01), Minato
patent: 5243400 (1993-09-01), Ringlien

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