| 摘要 |
PROBLEM TO BE SOLVED: To provide a lens which can be miniaturized while suppressing manufacturing defect, and a lighting fixture using the same.SOLUTION: A lens 200 includes a bottom surface 210, an emission surface 220 and an incidence concave surface 230. The emission surface 220 is made of a convex curve surface having an apex T0 at the upper center of the bottom surface 210. The incidence concave surface 230 is formed by denting the center of the bottom surface 210. The incidence concave surface 230 is, more specifically, a bell shape made of a smooth curve surface. The diameter of the incidence concave surface 230 is smaller toward the deeper side of the incidence concave surface 230, and the diameter becomes larger as going to an opening end 236 side of the incidence concave surface 230. The lens 200 is covered over a light source module 100 so that the incidence concave surface 230 faces a light emitting surface 101a. The lens 200 includes a first convex surface 240 which swells a little more than depth D0 of the incidence concave surface 230, at the bottom of the incidence concave surface 230. The first convex surface 240 relating to the embodiment 1 is a convex surface swelling to the outside.SELECTED DRAWING: Figure 5 |
