| 摘要 |
FIELD: physics. ^ SUBSTANCE: projection screen contains the first and second optical layers, each having external surface and opposite internal surface which profile is designed in the form of pyramidal prism body. Internal surfaces of layers are inserted to each other to make a clearance where the third, fourth and fifth thin optical layers are located, each layer being designed in the form of pyramidal identical elements body having the same shape as internal surfaces of the first and second layers. The third and fourth layers have low refractive index, white the first, second and fifth layers have high refractive index. The fifth layer is made of material with abnormal dispersion of refractive index, the third layer is located on internal surface of the first layer, the fourth layer is located on internal surface of the second layer, and the fifth layer is located between the third and fourth layers. External surface of the second layer is provided with reflecting layer containing supporting layer. Internal surfaces of the first and second layer, as well as the third, fourth and fifth layers, form zigzag structure transmitting projected light beams of specified incidence angle and wavelength due to effect of resonant diffraction and scattering of incoherent ambient light due to reflection from internal surface of the first layer. ^ EFFECT: increased operational reliability. ^ 9 cl, 6 dwg |
