| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical lens which can enhance light utilization efficiency by maximally taking emission light from a light source into a light guide plate by being arranged between the light source and the light guide plate.SOLUTION: Light incident parts 11 and first light emission faces 21 are arranged at positions respectively in which a rear surface 10 side and a front surface 20 side oppose each other, the light incident parts 11 and the first light emission faces 21 are arranged in a plurality of points at intervals in the longitudinal direction, each light incident part 11 comprises a first light incident face 12 composed of a recessed circular hyperbolic curved face which is formed by circularly extending a protrusive hyperbolic curved line in the longitudinal direction of a lens, and a pair of second light incident parts 13 composed of fan-shaped plane faces which are formed by circularly extending linear lines extending from both ends of the hyperbolic curved line to the lower outside in the longitudinal direction of the lens, and the first light emission face 21 is composed of a protrusive circular columnar face extending to the transverse direction of the lens. |
