Patent ID: 11319749

Abstract:
Provided is a retroreflective window which can block a direct light ray and reflect it to a sun side while maintaining a viewability and enhance a usability of the direct light ray. The retroreflective window (1 to 3) includes first and second transparent plate materials, a transparent first prism which is disposed between the first and second transparent plate materials, and a switching member which is installed facing a second side of the first prism and can be switched between a reflective state in which a reflectance of visible light rays and infrared rays is 70% or more and a non-reflective state in which the reflectance of visible light rays and infrared rays is 30% or less. When the switching member is in the reflective state, in the first prism, a light ray incident at a predetermined angle or more is emitted from the first transparent plate material at approximately the same angle as when entering, after being reflected by the switching member and a third side, and among light rays which enter at an angle less than the predetermined angle, the light ray reaching the third side is transmitted and emitted from the second transparent plate material.