| 摘要 |
<p>A lighting device the light quantity loss of which is small and the directivity of which is prevented from deteriorating. The lighting device comprises at least one white light source for emitting white light, a first light guide portion, which is disposed on the emission light axis of the white light source, for guiding the white light emitted from the white light source outward in a radial direction orthogonal to the emission light axis, a second light guide portion, which is disposed side by side with the first light guide portion in a direction along the emission light axis, for guiding light that travels radially inward in a direction along the emission light axis, a rotating portion for rotationally driving the first light guide portion and the second light portion integrally around the emission light axis, plural semiconductor light sources, which are disposed side by side circumferentially around the emission light axis radially outside the second light guide portion, for emitting illumination light radially inward, and plural wavelength region selection portions, which are disposed radially outside and spread across the first light guide portion and the second light guide portion at circumferential positions different from the semiconductor light sources, for selecting an optic element within a predetermined wavelength region from the white light guided by the first light guide portion and turning back the optic element to the second light guide portion.</p> |
