| 摘要 |
FIELD: rear-projection screens. ^ SUBSTANCE: screen has, at least, one light-diffusing polymethylmethacrylate layer, 0.05 to 4 mm-thick, containing spherical polymer particles with the size of 5 to 35 mcm in concentration of 2 to 60 % by weight on the basis of total weight of light-diffusing polymethylmethacrylate layer. The difference in refractive indices of spherical polymer particles and those of polymethylmethacrylate matrix makes from 0.02 to 0.2. The concentration cp of spherical polymer particles, thickness ds of light-diffusing polymethylmethacrylate layer, as well as the size Dp of spherical polymer particles are selected so that the ration cp.ds/Dp 3 varies from 0.001,5 to 0.015% by weight.mm/mcm3. The ration of mean roughness Ra of the polymethylmethacrylate layer surface to size Dp of spherical polymer particles varies from 0.05 to 0.4. ^ EFFECT: higher-quality image. ^ 20 cl, 1 dwg |
