| 摘要 |
To provide an infrared-light reflective plate having the improved selective reflectivity characteristics. Disclosed is an infrared-light reflective plate reflecting an infrared-light of equal to or longer than 700nm comprising a substrate of which fluctuation of retardation in plane at a wavelength of 1000nm, Re(1000), is equal to or more than 20nm, on a surface of the substrate, at least two light-reflective layers, X1 and X2, formed of a fixed cholesteric liquid crystal phase, and disposed in this order from the substrate, and, on another surface of the substrate, at least two light-reflective layers, Y1 and Y2, formed of a fixed cholesteric liquid crystal phase, and disposed in this order from the substrate, wherein the reflection center wavelengths of the light-reflective layers X1 and X2 are same with each other and are » X1 (nm), and the two layers reflect circularly-polarized light in opposite directions; the reflection center wavelengths of the light-reflective layers Y1 and Y2 are same with each other and are » Y1 (nm), and the two layers reflect circularly-polarized light in opposite directions; » X1 and » Y1 are not same; and refractive anisotropy of the light reflective layers X1 and X2, ”n X1 and ”n X2 satisfy the relation of ”n X2 <”n X1 , and refractive anisotropy of the light reflective layers Y1 and Y2, ”n Y1 and ”n Y2 satisfy the relation of ”n Y2 <”n Y1 . |
