| 摘要 |
PROBLEM TO BE SOLVED: To provide a reflection plate for a Fresnel lens which optimizes irradiation light of a lighting device using the Fresnel lens.SOLUTION: Light emitted to a direction other than the direction of a Fresnel lens, of emission light from a light source is reflected to the direction of the Fresnel lens by a concave reflection surface 22a of a reflection plate 22 for the Fresnel lens that is arranged between the Fresnel lens and the light source. Then, the emission light from the light source can be efficiently directed to the Fresnel lens. The light source and the Fresnel lens are fixed respectively to a positioning means 22b of the light source disposed on a bottom part of the concave reflection surface 22a and a positioning means 22c of the Fresnel lens disposed on opened edge part positioned on the side opposite to the bottom part of the concave reflection surface 22a and both are positioned. That is, the light source and the Fresnel lens are integrated via the reflection plate 22 for the Fresnel lens, at the same time, both are positioned and optical axes of emission light of the Fresnel lens and the light source precisely coincide with each other. |
