COMPOSITE TRANSPARENT LIGHTING DEVICE

摘要

A composite transparent lighting device is described. The device has a transparent substrate, an uniform distribution of low concentration dielectric particles, reflective perimeter and perimetral discrete light sources, of improved appearance both in the inoperative state of the device, and at the same time capable of providing good quality lighting when the device is active, i.e. when the discrete light sources on the perimeter of the device are turned on.

主权项

1. A composite transparent lighting device comprising a composite transparent element and discrete light sources, said discrete light sources being optically coupled with the composite transparent element perimeter, a reflective frame defining the boundaries of the composite transparent lighting device, said reflective frame being present on at least 80% of the composite transparent lighting element perimeter, wherein:
said composite transparent element comprises a transparent matrix and an uniform dispersion of dielectric particles, the transparent matrix has an optical light extinction coefficient equal or less than 0.009 cm−1 and said dielectric particle volume concentration is comprised between:cMax[VolVol]={6·10-11.2·[ρ3(m2-1m2+2)2]-1if10-13≤ρ6(m2-1m2+2)2<10-710-5.3·ρif10-7≤ρ6(m2-1m2+2)2<1010andcMin[VolVol]={6·10-12.8·[ρ3(m2-1m2+2)2]-1if10-13≤ρ6(m2-1m2+2)2<10-710-6.7·ρif10-7≤ρ6(m2-1m2+2)2<1010being ρ is the dielectric particle radius expressed in μm, m the ratio between the dielectric particle refractive index and the refractive index of the transparent substrate and the matrix transparency are evaluated at 500 nm.