Lenticular lens, light-diffusing sheet, and projection screen

摘要

A lenticular lens comprises multiple convex unit lenses, two sides of each unit lens being curved surfaces gradually spreading outwardly from the upside (plane of emergence) to the base (plane of incidence) of the unit lens, and these unit lenses are disposed on a base film in parallel with each other. The acute angle &thetas; between a tangent to two curves corresponding to the two sides of the unit lens on its section vertical to the longer direction and a line parallel to the upside (or the base) of the unit lens is in a range represented by the following inequality: 139(d/p)3−176(d/p)2+78(d/p)+74.4 >&thetas;>346(d/p)3−469(d/p)2+219(d/p)+45.0 where d is the length of half of the distance between the two curves, and p is the pitch at which the unit lenses are disposed.