| 摘要 |
PROBLEM TO BE SOLVED: To cope with the production conditions of many kinds of lenticular sheets according to exposure speeds, the width and the shape accuracy of a light-shielding pattern (black stripe(BS)) and to attain superior productivity by providing a cylindrical light source which is provided concentrically with a diffusion layer at the periphery of the cylindrical surface of a light source. SOLUTION: A cylindrical light source 10 is provided, which is composed of a cylindrical light source 11 as a core, a cooling tube and the diffusion layer 16 interposing a hollow space 15 between the tube and the layer. The cooling tube consists of an inner water-cooling tube 12 and an outer water-cooling tube 14 successively and concentrically and cooling water 13 passes through the inside of the cooling tube. Thus, this device possesses a function equal to that of a big light source by the diffusion layer 16 at the periphery of the light source 11 by the structure of being provided with the diffusion layer 16, even though the diameter of the light source 11 is small. Thus, it functions equal to a case in which batch irradiation of parallel light on the entire surface on the lenticular sheet from the side of a cylindrical lens for all cylindrical lenses, so that a BS is formed at an equal position for each cylindrical lens.
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