| 摘要 |
PROBLEM TO BE SOLVED: To provide a lighting device which reduces emission unevenness and deals with narrow angle light distribution.SOLUTION: A lighting device 10 includes: a light source 12; a transparent material 14; a concentrator 15; and a lens 16. The transparent material 14 has an incidence surface 27 and an emission surface 28 along an optical axis direction and guides light, which enters into the incident surface 27 from the light source 12, to emit the light from the emission surface 28. The concentrator 15 is provided so as to move along the optical axis direction of the transparent material 14. The lens 16 faces the emission surface 28 of the transparent material 14 and the concentrator 15.SELECTED DRAWING: Figure 1 |
