| 摘要 |
PURPOSE:To obtain a picture having an excellent contrast, whose view angle is controlled in the horizontal and vertical directions by providing a lenticular lens on one surface of a light-transmissive board and arraying a many fly-eyes' lenses on the condensing part of a light converging surface. CONSTITUTION:A convex cylindrical lens l1 is provided on one surface of a light-transmissive substrate consisting of a transparent synthetic resin, many fly-eyes' convex lens groups 11 whose pitch width is 1/5-1/50 of the cylindrical lens are provided on a condensing part f1 of a light converging surface of the other surface, and a non-condensing part n1 is covered with a film. A diverging light shown by x1-y1 is converted to a diverging light shown by x2-y2 by the fly-eyes' lens group, therefore, no external light is inserted, also the external light is absorbed by the covered film, and a distinct picture is obtained. Therefore, a view angle in the horizontal and vertical directions can be controlled, and also a picture having an excellent contrast can be obtained. |
