| 摘要 |
In an illumination device of the invention, the density D of the light deflection elements increases with an increase in a distance in a second direction from the incidence face (7L) to a position at which the light deflection elements (18) are arranged, an arrangement pattern of the light deflection elements (18) is separated into a plurality of regions in the second direction, in one region, an arrangement interval of the light deflection elements (18) in the first direction is substantially constant, an arrangement interval of the light deflection elements (18) in the second direction varies to be small with increased distance from the incidence face (7L), in between the regions, the arrangement interval of the light deflection elements (18) in the first direction discontinuously varies, the region becomes small with increased distance from the incidence face (7L), and the arrangement interval of the light deflection elements (18) in the second direction discontinuously varies in between the regions, and the arrangement interval of a first region close to the incidence face (7L) is smaller than the arrangement interval of a second region away from the incidence face (7L). |
