Illumination device and vehicle headlight
View Patent ↗In a head lamp 1 , relative positions of a laser light guide path in a tapered light guide section 20 and a parabolic mirror 5 are fixed. An optical fiber 10 and the tapered light guide section 20 are each provided so as to have a receiving end part where laser light is received and an emitting end part where laser light is emitted. The emitting end part of the optical fiber 10 is located near the receiving end part of the tapered light guide section 20.
1. An illumination device, comprising:
a first light guide section and a second light guide section, which guide emission light emitted from a light source;
a light conversion section converting the emission light which has been guided by the first and second light guide sections to illumination light; and
a light distribution section controlling distribution of the illumination light thus converted,
the first light guide section having flexibility and guiding the emission light to the second light guide section,
a light guide path for the emission light in the second light guide section and the light distribution section being provided so as to be fixed relative to each other,
the first and second light guide sections each having (i) a receiving end part where emission light is received and (ii) an emitting end part where emission light is emitted,
the emitting end part of the first light guide section being provided near the receiving end part of the second light guide section,
the light conversion section being provided on a metallic member, and
the light conversion section being irradiated with the emission light at one surface thereof opposite to the metallic member.
2. The illumination device as set forth in claim 1 , wherein the first light guide section is an optical fiber.
3. The illumination device as set forth in claim 1 , wherein:
the light source is made up of a plurality of light sources;
the first light guide section includes a plurality of optical fibers each receiving emission light from a corresponding one of the plurality of light sources; and
the plurality of optical fibers have respective emitting end parts which form a bundle.
4. The illumination device as set forth in claim 1 , wherein the emitting end part of the second light guide section has a cross-sectional area which is smaller than or equal to that of the receiving end part.
5. The illumination device as set forth in claim 1 , wherein the second light guide section has a reflective material coating on its external surface which corresponds to a part forming the light guide path.
6. The illumination device as set forth in claim 1 , wherein the second light guide section guides the emission light by means of total reflection, occurred due to a difference in refractive index between (i) a material which constitutes the second light guide section and (ii) surrounding environment.
7. The illumination device as set forth in claim 1 , wherein the second light guide section is a convex lens which converges the emission light guided from the first light guide section onto the light conversion section.
8. The illumination device as set forth in claim 1 , wherein the emitting end part of the first light guide section and the receiving end part of the second light guide section are fixed integrally.
9. The illumination device as set forth in claim 1 , wherein:
the light source emits excitation light as the emission light; and
the light conversion section contains a fluorescent material which emits fluorescence upon receipt of the excitation light.
10. The illumination device as set forth in claim 1 , wherein the light conversion section contains a scatterer which scatters the emission light guided by the second light guide section.
11. A vehicle headlight, comprising an illumination device as set forth in claim 1 .