| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a lighting sheet that can suppress direct radiation (direct incident light) of sunlight, achieves efficient lighting, and makes an outdoor side visible from an indoor side.SOLUTION: A lighting sheet 20 is disposed on an opening of a building, with a sheet surface set vertical; and the sheet includes a light-transmitting substrate layer 22 and a light-deflecting layer 23 that is formed on one surface of the substrate layer and deflects light. The light-deflecting layer includes: a plurality of light-transmitting portions 24 arranged along the one surface of the substrate layer and transmitting light; and light-deflecting portions 25 disposed among the plurality of the light-transmitting portions and filled with a material having a refractive index lower than that of the light-transmitting portions. In a posture of the lighting sheet disposed on an opening of a building, the light-deflecting portion is configured in such a manner that, on a cross section along a thickness direction of the lighting sheet, an upper side edge of the light-deflection portion is composed of a polygonal line including a plurality of connected straight lines, or a curved line, and the upper side edge is formed to be convex downward, while a lower side edge opposite to the upper side edge is formed into a single straight line.</p> |
