Method of examining film quality of a membranal material and an

Details Method of examining film quality of a membranal material and an Method of examining film quality of a membranal material and an

1995-12-12

1997-09-23

Font, Frank G.

Optics: measuring and testing

Inspection of flaws or impurities

Having predetermined light transmission regions

356376, 356382, 356432, G01N 2100

Patent

active

056710445

ABSTRACT:
Polarized test light is radiated on the rear surface of a test film placed on a light-transmissive substrate, so that the quality of the film is detected by observing a color-irregularity pattern formed on the front surface of the test film. An apparatus of this detection includes: a light-transmissive substrate on which a test film is placed; a planar light source disposed on the rear side of the substrate; and a polarizing plate disposed between the planer light source and the light-transmissive substrate. The polarizing plate is preferably provided rotatable.

REFERENCES:
patent: 5452079 (1995-09-01), Okugawa
patent: 5528359 (1996-06-01), Taguchi

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