| 摘要 |
PROBLEM TO BE SOLVED: To accurately inspect a linear polarizing plate for a defect such as a flaw on the surface, foreign matter adhered to the surface, pinholes, or unevenness. SOLUTION: Light from outside of one face F1 of a linear polarizing plate 1 is prevented from shining on the one face F1. In this state, linear polarized light is irradiated on the other face F2 of the linear polarizing plate 1 so as to form a crossed nicol with the linear polarizing plate 1 for observing the other face F2.
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