NATURAL LIGHTING FILM, NATURAL LIGHTING FILM LAMINATE, NATURAL LIGHTING MEMBER AND NATURAL LIGHTING TOOL

摘要

PROBLEM TO BE SOLVED: To provide a natural lighting film capable of guiding more incident light to an indoor ceiling, etc.;SOLUTION: A natural lighting film 10 includes: a polymer resin film having a first face configured to receive incident light and a second face opposing the first face and configured to emit light; and a plurality of craze areas 13 each arranged between the first face and the second face of the polymer resin film and configured to deflect the light incident from the first face to emit the light to the second face. If an interval of the craze areas 13 is P and a depth of a craze area is H, an aspect ratio P/H is 0.42-0.75. If a width of a craze area 13 is W, an opening ratio (1-(W/P))×100 is 90% or more.;SELECTED DRAWING: Figure 2;COPYRIGHT: (C)2018,JPO&INPIT