Light control member, roll screen, lighting sheet and window with light control layer

摘要

PROBLEM TO BE SOLVED: To provide a light control member, etc., capable of exhibiting both illuminance improvement and antidazzle function using a daylighting function.SOLUTION: The light control member has a high refractive index layer 2 and a low refractive index layer 3, the high refractive index and low refractive index layers being arranged between an incidence surface 5 and an emission surface 6 so that a different refractive index interface, which is the interface of the high refractive index and low refractive index layers, or its extension face intersects the emission and incidence surfaces, and has a first area 1A disposed on one side parallel to the emission and incidence surfaces and a second area 2B on the other side. In the first area, a total reflection interface F, which is a different refractive index interface f having the high refractive index layer on one side, has a low emission angle interface F1 in which an angle &thetas;1 on the low refractive index layer side forms an acute angle relative to the incidence surface. In the second area, the total reflection interface has a high emission angle interface F2 in which an angle &thetas;2 on the low refractive index layer side forms an obtuse angle relative to the incidence surface.