LIGHTING SYSTEM FOR THE EVENLY DISTRIBUTED EMISSION OF LIGHT FROM LIGHT SOURCES

Abstract

A lighting system is disclosed for the spatially evenly distributed emission of light from first, second and third light sources. The spectral ranges of the light emitted by the different light sources are different from each other. The lighting system includes: a holding layer or carrier layer, on which the light sources are arranged in groups each having one each of the first, second and third light sources; and a luminophore layer, which is arranged in the propagation direction of the light from the light sources and has a first, a second and a third luminescent-material film. The luminescent material of each luminescent-material film is induced to luminesce largely, more particularly exclusively, by means of the first, second or third light sources.

Claims

1. A lighting system for the spatially evenly distributed emission of light from light sources which emit light in different spectral ranges, comprising: a) light sources of a first type, which emit light in a first spectral range; b) light sources of a second type, which emit light in a second spectral range; c) light sources of a third type, which emit light in a third spectral range; d) a carrier layer, on which the light sources are arranged in groups which are regularly spaced apart from each other, wherein each group comprises the three light sources and in each group each light source belongs to a different one of the three types than the other light sources in the group; e) a luminescent-material layer arranged in a beam direction of the light sources, comprising: i) a first luminescent material in a first luminescent-material film, which is caused to luminesce by the light sources of the first type; ii) a second luminescent material in a second luminescent-material film arranged on the first luminescent-material film in the beam direction of the light sources, which is caused to luminesce by the light sources of the second type; and iii) a third luminescent material in a third luminescent-material film arranged on the second luminescent-material film in the beam direction of the light sources, which is caused to luminesce by the light sources of the third type.

2. The lighting system according to claim 1, wherein the luminescent-material layer is spaced apart from the light sources at a smaller distance than the distance between the groups of the light sources.

3. The lighting system according to claim 1, wherein the luminescent-material layer is arranged directly on a further component of the lighting system, in particular the carrier layer, in the direction of the carrier layer.

4. The lighting system according to claim 1, wherein a micro-optical system for deflecting light is arranged between the luminescent-material layer and the light sources.

5. The lighting system according to claim 1, wherein a diffuser layer for scattering light is arranged on the luminescent-material layer, on the side of the luminescent-material layer that faces away from the carrier layer.

6. The lighting system according to claim 1, wherein the first luminescent-material film comprises blue-light-emitting luminescent material, the second luminescent- material film comprises green-light-emitting luminescent material and the third luminescent-material film comprises red-light-emitting luminescent material, wherein the first luminescent-material film is arranged closer to the carrier layer than the second luminescent-material film and the second luminescent-material film is arranged closer to the carrier layer than the third luminescent-material film.

7. The lighting system according to claim 1, wherein the light sources are designed as light-emitting diodes.

8. The lighting system according to claim 1, wherein the light sources emit light in the blue range of the optical spectrum, wherein the maximum intensity of the light source of the first type is 405 nm to 422 nm, the maximum intensity of the light source of the second type is 425 nm to 442 nm, and the maximum intensity of the light source of the third type is 445 nm to 460 nm.

9. The lighting system according to claim 1, wherein the groups of the light sources are arranged in a rectangular pattern.

10. The lighting system according to claim 1, wherein the light sources are designed to be operated with pulse width modulation.

11. The lighting system according to claim 1, wherein the carrier layer comprises a metal, being copper.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0060] FIG. 1 is a schematic view of a first embodiment of the lighting system;

[0061] FIG. 2 is a schematic view of a second embodiment of the lighting system.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0062] The lighting system 10 according to the invention shown in FIG. 1, for the spatially evenly distributed emission of light from light sources 12a, 12b, 12c which emit light in different spectral ranges, in a first embodiment has light sources 12a of a first type, which emit light in a first spectral range, light sources 12b of a second type, which emit light in a second spectral range, and light sources 12c of a third type, which emit light in a third spectral range. On a carrier layer 14, the light sources 12a, 12b, 12c are arranged in groups 16 which are regularly spaced apart from each other at a grouping distance 18. Each group 16 comprises three light sources 12a, 12b, 12c, each light source 12a, 12b, 12c in each group 16 belonging to a different one of the three types than the other light sources 12a, 12b, 12c in the group 16.

[0063] The lighting system 10 comprises a luminescent-material layer 20 arranged in the beam direction SR of the light sources 12a, 12b, 12c. The luminescent-material layer 20 has a first luminescent-material film 22a having a first luminescent-material 24a which is caused to luminesce by the light sources 12a of the first type. In the beam direction SR of the light sources 12a, 12b, 12c, a second luminescent-material film 22b having a second luminescent-material 24b which is caused to luminesce by the light sources 12b of the second type is arranged on the first luminescent-material film 22a. A third luminescent-material film 22c having a third luminescent-material 24c which is caused to luminesce by the light sources 12c of the third type is arranged on the second luminescent-material film 22b in the beam direction SR of the light sources 12a-12c. The first luminescent-material film 22a comprises blue-light-emitting luminescent-material 24a. The second luminescent-material film 22b comprises green-light-emitting luminescent-material 24b. The third luminescent-material film 22c comprises red-light-emitting luminescent-material 24c. All desired colors can be produced by combining the radiation emitted by the luminescent-material films 22a-22c. The first luminescent-material film 22a is arranged closer to the carrier layer 14 than the second luminescent-material film 22b. The second luminescent-material film 22b is arranged closer to the carrier layer 14 than the third luminescent-material film 22c. The height 26 of the lighting system 10 in the beam direction SR of the light sources 12a-12c is in the range of 20 mm to 100 mm.

[0064] A layer distance 27 is formed between the luminescent-material layer 20 and the light sources 12a-12c. In particular, an air layer is located between the luminescent-material layer 20 and the carrier layer 14, in which air layer light cones 28 of the various groups 16 of light sources 12a-12c can overlap for the purpose of homogenization. A diffuser layer 32 for scattering light, in particular from the light sources 12a-12c, is located on the luminescent-material layer 20 on the side of the luminescent-material layer 20 that faces away from the carrier layer 14. The light sources 12a-12c are in particular designed as light-emitting diodes.

[0065] The second embodiment of the lighting system 10 that is shown in FIG. 2 comprises a micro-optical system 34 between the light sources 12a-12c and the luminescent-material layer 20, which micro-optical system is used to deflect light from the light sources 12a-12c and thus to homogenize said light. As a result, the height 26 of the lighting system 10, with a value of 3 mm to 10 mm, can be significantly smaller than in the first embodiment.

[0066] Taking all of the figures of the drawings in combination, the invention relates to a lighting system 10 for the spatially evenly distributed emission of light from first, second and third light sources 12a-12c, the spectral ranges of the light emitted by the different light sources 12a-12c being different from each other, the lighting system comprising: -a holding layer or carrier layer 14, on which the light sources 12a-12c are arranged in groups each comprising one each of the first, second and third light sources 12a-12c; and -a luminophore layer 20, which is arranged in the propagation direction of the light from the light sources 12a-12c and has a first, a second and a third luminescent-material film 22a-22c, the luminescent material 24a-24c of each luminescent-material film 22a-22c being induced to luminesce largely, more particularly exclusively, by means of the first, second or third light sources 12a-12c.