IPC分类号：
F21V8/00 | F21K9/64 | G02B6/036
国民经济行业分类号：
C4350 | C3874 | C4090 | C3879
当前申请(专利权)人：
SIGNIFY HOLDING B.V.
原始申请(专利权)人：
PHILIPS LIGHTING HOLDING B.V.
发明人：
HOELEN, CHRISTOPH, GERARD, AUGUST | KADIJK, SIMON, EME | HAENEN, LUDOVICUS, JOHANNES, LAMBERTUS | LI, YUN
代理人：
MALLENS, ERIK, PETRUS, JOHANNES ET AL.
摘要：
The invention provides a lighting device (1) comprising a light source configured to provide light source light and a luminescent element (5) comprising an elongated light transmissive body (100), the elongated light transmissive body (100) comprising a side face (140), wherein the elongated light transmissive body (100) comprises a luminescent material (120) configured to convert at least part of the light source light (11) selected from one or more of the UV, visible light, and IR received by the elongated light transmissive body (100) into luminescent material radiation (8). The side face comprises the radiation input face (111), and the body further comprises a first face (141) and a second face (142) defining a length of the body, wherein the second face comprises a first radiation exit window (112). The side face comprises a curvature with a radius r, and the concentration of the luminescent material is chosen such that at least 80% of the source light is absorbed within a first length x from the side face, wherein x/r <= 0.4 applies.
技术问题语段：
The technical problem addressed in this patent is the need for high brightness light sources for various applications such as spots, stage-lighting, headlamps, and digital light projection. The invention relates to a lighting device comprising an elongated light transmissive body, such as a rod, which can be illuminated by LEDs and/or laser diodes to produce longer wavelengths within the rod. The converted light then exits the rod through one of its surfaces, resulting in an intensity gain. The invention also includes a light concentrator module that can be used in various applications to concentrate and redirect the light emitted by LEDs and/or laser diodes.
技术功效语段：
The invention is about a lighting device that uses a light concentrator to convert short-wavelength light to longer-wavelength light. This allows for the production of high-brightness light sources for various applications such as stage-lighting and headlamps. The light concentrator is made up of a rectangular bar of a phosphor-doped, high refractive index garnet, which converts blue light into green light and collects it in a small etendue output beam. The light concentrators can be used in lighting devices or in projection systems. The technical effect of the invention is to provide a more efficient and controlled way to produce high-brightness light sources.
权利要求：
CLAIMS:
1. A lighting device (1) comprising:
a light source (10) configured to provide light source light (1 1); a luminescent element (5) comprising an elongated light transmissive body (100), the elongated light transmissive body (100) comprising a side face (140), wherein: - the elongated light transmissive body (100) comprises a luminescent material
(120) configured to convert at least part of a light source light (11) selected from one or more of the UV, visible light, and IR received by the elongated light transmissive body (100) into luminescent material radiation (8);
the side face (140) comprises a curvature with a radius (r);
- wherein the elongated light transmissive body (100) comprises a radiation input face (11 1) and a first radiation exit window (112); wherein the luminescent material (120) is configured to convert at least part of light source light (1 1) received at the radiation input face (11 1) into luminescent material radiation (8), and the luminescent element (5) configured to couple at least part of the luminescent material radiation (8) out at the first radiation exit window (1 12) as converter radiation (101).
wherein the elongated light transmissive body (100) has a first face (141) and a second face (142) defining a length (L) of the elongated light transmissive body (100); wherein the side face (140) comprises the radiation input face (1 11), wherein the second face (142) comprises the radiation exit window (1 12), and
- wherein the concentration of the luminescent material (120) is chosen such that at least 80% of the light source light (11) is absorbed within a first length (x) from the side face (140), wherein x/r<0.4 applies.
2. The lighting device (1) according to claim 1, wherein the radius (r) is selected from the range of 0.25-50 mm.
3. The lighting device (1) according to any one of the preceding claims, wherein the concentration of the luminescent material (120) is chosen such that at least 90% of light
(11) in the blue is absorbed within the first length (x) from the side face (140), wherein x/r<0.4 applies, and wherein the first length (x) is equal to or less than 5 mm.
4. The lighting device (1) according to any one of the preceding claims, wherein the side face (140) has a convex shape.
5. The lighting device (1) according to any one of the preceding claims, wherein the elongated light transmissive body (100) has a tubular shape having a cavity (1 150) surrounded by the elongated light transmissive body.
6. The lighting device (1) according to claim 5, wherein at least part of the cavity (1150) comprises a light transmissive material (1151), differing in composition from the composition of the material (121) of the elongated light transmissive body (100), wherein the light transmissive material (1 151) in the cavity has an index of refraction equal to or lower than the light transmissive material (121) of the light transmissive body (100).
7. The lighting device (1) according to any one of the preceding claims 1 -4, wherein the elongated light transmissive body (100) has an axis of elongation (BA) and a circular cross-section perpendicular to the axis of elongation (BA).
8. The lighting device (1) according to any one of the preceding claims, wherein one or more of the first face (141) and the second face (142) comprise a plane (1 140) comprising surface modulations (1141) thereby creating different modulation angles (β) relative to the respective plane (1 140).
9. The lighting device (1) according to claim 8, wherein the surface modulations (1141) are configured to promote reflection in a tangential direction more than in a radial direction. 10. The lighting device (1) according to any one of the preceding claims, further comprising an optical element (24) optically coupled to the elongated light transmissive body (100).
11. The lighting device (1) according to claim 10, wherein the elongated light transmissive body (100) and the optical element (24) are a single body.
12. The lighting device (1) according to any one of the preceding claims, wherein the optical element (24) is selected from the group consisting of a compound parabolic concentrator, an adapted compound parabolic concentrator, a dome, a wedge-shaped structure, and a conical structure, and wherein the elongated light transmissive body (100) is obtainable by a process comprising (a) one or more of extrusion, injection molding, pressing, and casting, and (b) sintering.
13. The lighting device (1) according to any one of the preceding claims, wherein x/r<0.3.
14. The lighting device (1) according to any one of the preceding claims, further comprising an optical element (24), wherein the optical element (24) is configured to one or more of (i) collimating the luminescent radiation (8) and (ii) extracting luminescent radiation (8) from the elongated light transmissive body (100), and wherein the optical element (24) is (a) optically coupled to the elongated light transmissive body (100), or wherein the optical element (24) and the elongated light transmissive body (100) are comprised by a single body.
15. A projection system or a luminaire comprising a lighting device according to any one of the preceding claims.