| 摘要 |
FIELD: physics, optics. ^ SUBSTANCE: rear projection screen contains one light-diffusing polymethyl methacrylate layer, which includes polymethyl methacrylate matrix, and also spherical diffusing particles (A) and speherical particles (B). At that particles (A) have size from 0.1 to 40 micrometer with index of refraction, which differs from refraction index of polymethyl methacrylate matrix by value from 0.02 to 0.2. Particles (B) have size from 10 to 150 micrometer and refraction index, which differs from refraction index of polymethyl methacrylate matrix by value from 0 to 0.2. Total concentration of particles (A) and particles (B) makes from 1 to 60 wt % in equivalent to mass of light-diffusing polymethyl methacrylate layer. Concentration cPA of particles (A), thickness dS of light-diffusing polymethyl methacrylate layer, and also size DPA of spherical diffusing particles (A) are selected so that ratio cPAdS/DPAÇè3 makes from 0.001 to 0.015% wtmm/mcm3, concentration cPB of particles (B), thickness ds of light-diffusing polymethyl methacrylate layer, and also size DPB of spherical particles (B) are selected so that ratio CPBdS/DPBÇè3 makes from 0.000005 to 0.002% wtmm/mcm3 and ratio of average roughness RZ of polymethyl methacrylate layer surface squared to size of spherical particles (B) cubed, RzÇè2/DPBÇè3, makes from 0.0002 to 0.1300 mcm-1. ^ EFFECT: cocreation of scratch-safe rear rejection screen. ^ 29 cl |
