| 摘要 |
PROBLEM TO BE SOLVED: To obtain a Fresnel lens having a low coefficient of static friction and less liable to produce white dust owing to vibration in the transportation of a transmission type screen using the lens by using a cured body of a UV- curing resin composition having a specified coefficient of static friction or below. SOLUTION: The Fresnel lens consists of a transparent substrate and a Fresnel lens part formed from a cured body of a UV-curing resin composition having a coefficient of static friction of <=0.6. Polycarbonate, polyester, polyacrylate, polystyrene or a mixture of these resins may be used as the material of the transparent substrate. When a methacrylic resin sheet is used as the transparent substrate, the coefficient of static friction of the cured body is preferably <=0.6, in particular <=0.5. In the case of >=0.6 white dust is undesirably produced in transportation.
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