| 摘要 |
Provided is a lens capable of improving the efficiency of taking light from a light source and increasing the degree of freedom in the size of the disposed light source. A plurality of leg parts (10d) are arranged outside a circle with a diameter of 0.37 D (D is the diameter of a lens (10)) with the optical axis (OA) as the center, thus preventing the obstruction of a light beam (LB1) from a light emitting element (50) by the leg parts (10d). As a result, the utilization efficiency of light may be improved. Further, by arranging the plurality of leg parts (10d) in the area outside the circle of 0.37 D, it is possible to increase the degree of freedom in size of the light emitting element (50) arranged between the plurality of leg parts (10d) opposite a first optical surface (S1). Further, it is possible to distance the plurality of leg parts (10d) from the light emitting element (50) to some extent, to prevent localized heating inward of the leg parts (10d), and to minimize the formation of cracks in the periphery of the leg parts (10d). |
