Light diffusing body and a transmission type screen
First Claim
1. A light diffusing body comprising a transparent resin and spherical micro-particles having a refractive index which is different from that of the transparent resin,wherein when the value obtained by dividing the sum of scattering cross-sections of all spherical micro-particles contained in the unit area of the light diffusing body by the sum of geometrical cross-sections of all these spherical micro-particles for each of multiple wavelengths, the minimum value of all of values obtained for each wavelength is 90% or higher of the maximum value.
1 Assignment
0 Petitions
Accused Products
Abstract
A light diffusing body and transmission type screen, which can reduce the shift of the color tone of the light source light seen through the light diffusing body and prevent the phenomenon that the white light source seen through the light diffusing body looks colored, is provide.
The light diffusing body 1 of the present invention comprises a transparent resin and spherical micro-particles having a different refractive index from that of the said transparent resin, wherein the relation between the maximum value (Emax) and the minimum value (Emax) of the effective scattering efficiency values (E) obtained for each center wavelength in the wavelength ranges of blue, green and red by dividing the sum of scattering cross-sections of all spherical micro-particles contained in the unit area of the aforementioned light diffusing body 1 by the sum of geometrical cross-sections of all these spherical micro-particles satisfies Emin/Emax≧0.90.
-
Citations
18 Claims
-
1. A light diffusing body comprising a transparent resin and spherical micro-particles having a refractive index which is different from that of the transparent resin,
wherein when the value obtained by dividing the sum of scattering cross-sections of all spherical micro-particles contained in the unit area of the light diffusing body by the sum of geometrical cross-sections of all these spherical micro-particles for each of multiple wavelengths, the minimum value of all of values obtained for each wavelength is 90% or higher of the maximum value.
-
6. A light diffusing body having a light diffusing layer and a transparent polymer film laminated on at least one surface of the light diffusing layer,
wherein the light diffusing layer comprises transparent resin and spherical micro-particles having a refractive index different from that of the transparent resin, and when the value obtained by dividing the sum of scattering cross-sections of all spherical micro-particles contained in the unit area of the light diffusing body by the sum of geometrical cross-sections of all these spherical micro-particles for each of multiple wavelengths, the minimum value of all of values obtained for each wavelength is 90% or higher of the maximum value.
Specification