| 摘要 |
PROBLEM TO BE SOLVED: To provide the reflection polarizer of a low polarization degree to light made incident from an oblique direction by alternately laminating many first layers provided with refractive index anisotropy within a plane and second layers not provided with the refractive index anisotropy within the plane and making the first layers be optically biaxial. SOLUTION: For this reflection polarizer, the two kinds of high polymer layers 101 and 102 are alternately laminated. Relating to the two kinds of high polymers, one is selected from the materials of a large photoelastic modulus and the other one is selected from the materials of a small photoelastic modulus and the refractive indexes of the ordinary rays of both are almost equal. The first layer 101 is provided with the refractive index anisotropy within the plane and the second layer 102 is hardly provided with the refractive index anisotropy within the plane. Also, the first layer 101 is optically biaxial. Among the light made incident obliquely within a y-z plane, the refractive index to the light vibrated within the y-z plane is different between the first layer 101 and the second layer 102. That is, as an incident angle becomes large, the ratio of reflected light increases and the polarization degree is degraded. |
