| 摘要 |
PURPOSE:To avoid the photographing of the external light and to obtain a high- contrast screen, by forming the condensing part on the other side of a light focusing surface of a convex cylindrical lens group with a convex or concave cylindrical lens group. CONSTITUTION:Lenticular sheets 10 and 20 are made of transparent materials of acrylic resin, polyvinyl chloride resin, etc. Surfaces S1 and S2 of one side are formed by convex cylindrical lens groups l1.l1... and l2.l2.... Then the light absorber coating films C1 and C2 of non-condensing parts n1 and n2 on surfaces S4 and S5 are gray or black in order to absorb the output of external light and to prevent the back reflection. The convex cylindrical lens groups 11 and 21 of condensing parts f1 and f2 on the surfaces S4 and S5 have the same axial line in order to expand X1-Y1 to X2-Y2 when the incident light to the sheets 10 and 20 is dispersed from the surfaces S4 and S5 on the light focusing surface. An exactly same effect is secured even though the parts f1 and f2 are formed with concave cylindrical lens groups. |
