Method of and apparatus for measuring retardation of composite layer
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United States of America Patent
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May 6, 1997
Grant Date -
N/A
app pub date -
Sep 26, 1995
filing date -
Sep 30, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A compensation polarizing plate which is superior in polarization characteristic to a polarizing filter layer of a composite layer sample is arranged on the polarization filter layer side of the composite layer sample whose polarizing filter layer has an insufficient degree of polarization, and polarization transmission axes of the polarizing filter layer and the compensation polarizing plate are kept in parallel with each other to compensate the polarization characteristics of the polarization filter layer. Measurement for obtaining the retardation value and the optical principal axis direction of the sample is carried out in the state of the compensated sample.
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