| 摘要 |
The present invention provides an optical element capable of improving the adhesion between the alignment property providing layer, for providing the alignment property to the refractive index anisotropic layer, and the refractive index anisotropic layer, as well as improving durability of each layer. An optical element 10 comprises an alignment property providing layer 12 laminated on the transparent base material 11 , and a refractive index anisotropic layer 13 laminated on the alignment property providing layer 12 . The alignment property providing layer 12 is an alignment film which provides the alignment property to the refractive index anisotropic layer 13 . And the alignment property providing layer 12 is made from an alignment film composition capable of exhibiting the alignment limiting force by the photo-alignment method. The refractive index anisotropic layer 13 comprises a liquid crystal layer formed by curing (polymerizing) a liquid crystalline composition including a polymerizable liquid crystal material. In the refractive index anisotropic layer 13 , the curing degree of the refractive index anisotropic layer 13 changes monotonously with a predetermined gradient in its thickness direction such that, within the refractive index anisotropic layer 13 , the curing degree of the portion closer to the alignment property providing layer 12 is larger, compared with the curing degree of the portion farther from the alignment property providing layer 12 . It is preferable that the average curing degree of the refractive index anisotropic layer 13 is 90% or more. |
