OPTICAL SKY-SUN DIFFUSER

摘要

A solid optical sky-sun diffuser which comprises a transparent solid matrix embedding a dispersion of transparent nanoparticles having an average size d in the range 10nm = d = 240nm; wherein: the ratio between the blue and red scattering optical densities ? = Log[T (450nm)]/ Log[T (630/nm)] of said diffuser falls in the range 5 = ? = 2.5, where T(?) is the Monochromatic Normalized Collinear Transmittance; in at least one propagation direction, said Monochromatic Normalized Collinear Transmittance is T(450nm) = 0.4; in at least one propagation direction said Monochromatic Normalized Collinear Transmittance is T(450nm) = 0.9 said propagation direction being the same or different from that at which said Monochromatic Normalized Collinear Transmittance is T(450nm) = 0.4.