| 摘要 |
PROBLEM TO BE SOLVED: To irradiate a distant place while suppressing Fresnel loss on the emission surface of an optical lens body.SOLUTION: A light source unit includes: an optical lens body 39 that has an incident recess part 65 covering a COB type LED 35, and a convex lens part emission surface 61S expanding light made incident from an incident surface 66 of the incident recess part 65 in a first direction J1 orthogonal to an optical axis FL and emitting the light. On a cross section in a first direction, a plurality of incident side inclination surfaces 83 is formed on the incident surface 66 of the optical lens body 39. Each incident side inclination surface 83 is formed so that a refractive angle γ of incident light is 50° or less on the convex lens part emission surface 61S.SELECTED DRAWING: Figure 12 |
