| 摘要 |
PROBLEM TO BE SOLVED: To enhance light utilization efficiency of a light-emitting element.SOLUTION: In a lens 33 for illumination, an incident surface 71 of a convex curve surface is provided on a bottom surface on the side of an emission surface 72, and light of an LED 51 as a light source made incident to the incident surface 71 is distributed in a first direction orthogonal to a direction of an optical axis K. On the bottom surface, a first reflection surface 75 reflecting light toward the emission surface 72 is provided at both sides holding the incident surface 71 in a second direction orthogonal to the direction of the optical axis K and the first direction.SELECTED DRAWING: Figure 11 |
