| 摘要 |
PROBLEM TO BE SOLVED: To provide a daylighting sheet capable of suppressing direct projection of sunlight (direct incident light), allowing efficient lighting, and making an outdoor side visible from an indoor side.SOLUTION: A daylighting sheet includes: a base material layer 22; and a light deflection layer 23 configured to deflect light. The light deflection layer includes: a plurality of light transmission parts 24 arranged along a side of the base material layer; and light deflection parts 25 arranged between the plurality of light transmission parts and filled with an ultra-violet ray curable resin composition having a refractive index lower than the light transmission part. At a portion with the light transmission part arranged, the front and back sides of the light deflection layer are formed in parallel, and in a vertical section in a thickness direction of the daylighting sheet, the upper side of the light deflection part is formed as a polygonal line in which a plurality of straight lines continue, or a curved line, and the upper side is formed projecting downward. The lower side is a single straight line tilted by 0-30°, inclusive, relative to the normal line of the sheet surface. An angle at a light emission side end part relative to the normal line of the sheet surface of the upper side is smaller than an angle relative to the normal line of the sheet surface of the lower side.SELECTED DRAWING: Figure 3 |
