Method of examining film quality of a membranal material and an apparatus therefor
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United States of America Patent
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Sep 23, 1997
Grant Date -
N/A
app pub date -
Dec 12, 1995
filing date -
Dec 12, 1994
priority date (Note) -
Expired
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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.
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