Lighting device

Patent metadata

Field	Value
Publication number	US-9528691-B2
Application number	US-201214115614-A
Country	US
Kind code	B2
Filing date	May 11, 2012
Priority date	May 26, 2011
Publication date	Dec 27, 2016
Grant date	Dec 27, 2016

Abstract

A lighting device has a carrier with a mounting face. A number of light-emitting diodes include at least two of the light-emitting diodes suitable for emitting light of different colors during operation. At least one color sensor, during operation, detects the light of at least one of the light-emitting diodes. At least one light-measuring face is illuminated by light of at least one of the light-emitting diodes and reflects and/or scatters at least a portion of this light. The light-emitting diodes and the at least one color sensor are arranged on the mounting surface, the at least one light-measuring face is arranged at a distance from the carrier, and the at least one color sensor; detects for the most part light reflected by the at least one light-measuring face from at least one of the multiplicity of light-emitting diodes.

First claim

The invention claimed is:

1. A lighting device comprising:
a carrier having a mounting area;
a plurality of light-emitting diodes, wherein at least two of the light-emitting diodes are suitable for emitting light of mutually different colors during operation;
a color sensor configured to detect the light from at least one of the light-emitting diodes during operation; and
a light-measuring area that is to be illuminated by the light from at least one of the light-emitting diodes and is configured to reflect and/or scatter at least part of the light,
wherein the light-emitting diodes and the color sensor are arranged on the mounting area,
wherein the light-measuring area is arranged remote from the carrier,
wherein the color sensor is configured to detect mostly the light from at least one of the light-emitting diodes that is reflected and/or scattered by the light-measuring area,
wherein the light-measuring area is arranged at a cover plate of the lighting device, wherein the cover plate is arranged at a side of the mounting area in a manner spaced apart from the carrier,
wherein the cover plate is light-transmissive and has a lower haze than the light-measuring area, and
wherein the light-measuring area is formed with a diffusely reflective or diffusely scattering material, which is arranged at a side of the cover plate that faces the plurality of light-emitting diodes.

2. The lighting device according to claim 1 , comprising two light-measuring areas, wherein a first of the two light-measuring areas reflects or scatters light of a specific color to a greater extent than a second of the two light-measuring areas.

3. The lighting device according to claim 1 , wherein the color sensor has a reception range having an aperture angle and wherein exactly one light-measuring area is arranged in the reception range of the color sensor.

4. The lighting device according to claim 1 , wherein the light-measuring area is illuminated by the light from a plurality of the light-emitting diodes.

5. The lighting device according to claim 1 , wherein the light-measuring area is shielded from ambient light, such that most or all light that impinges on the light-measuring area has been generated by the light-emitting diodes.

6. The lighting device according to claim 1 , wherein the light-measuring area is arranged at a cover plate of the lighting device, wherein the cover plate is arranged at a side of the mounting area in a manner spaced apart from the carrier.

7. The lighting device according to claim 6 , wherein the cover plate is light-transmissive and has a lower haze than each of the light-measuring area.

8. The lighting device according to claim 7 , wherein the light-measuring area is formed with a diffusely reflective or diffusely scattering material, that is arranged at that side of the cover plate which faces the plurality of light-emitting diodes.

9. The lighting device according to claim 6 , wherein a sum of areas of all light-measuring areas is at most 10% of the area of the cover plate.

10. The lighting device according to claim 1 ,
wherein the lighting device comprises a plurality of color sensors;
wherein each color sensor has a reception range having an aperture angle;
wherein the lighting device comprises a plurality of light measuring areas;
wherein exactly one light-measuring area is arranged in the reception range of each color sensor; and
wherein an area of each light-measuring area is at most double a magnitude of an area of a projection of the reception range of the color sensor assigned to the light-measuring area.

11. The lighting device according to claim 1 , wherein the light-measuring area reflects or scatters light of one color to a greater extent than light of another color and wherein the color sensor is assigned to the light-measuring area and has a higher sensitivity to the more greatly reflected or more greatly scattered light than to the light of the other color.

12. The lighting device according to claim 1 , further comprising a drive apparatus configured to regulate the plurality of light-emitting diodes in a manner dependent on measurement signals of the color sensor.

13. The lighting device according to claim 12 , wherein the drive apparatus is configured to set and keep substantially constant a color locus and/or a color temperature of mixed light from the light-emitting diodes that is emitted by the lighting device.

14. A lighting device comprising:
a carrier having a mounting area;
a plurality of light-emitting diodes, wherein at least two of the light-emitting diodes are suitable for emitting light of mutually different colors during operation;
a plurality of color sensors configured to detect the light from at least one of the light-emitting diodes during operation;
a plurality of light-measuring areas that are to be illuminated by the light from at least one of the light-emitting diodes and configured to reflect and/or scatter at least part of the light;
wherein the light-emitting diodes and the color sensors are arranged on the mounting area;
wherein the light-measuring areas are arranged in a manner remote from the carrier; and
wherein the color sensors are configured to detect for mostly light from at least one of the light-emitting diodes that is reflected and/or scattered by the light-measuring areas.

15. The lighting device according to claim 14 ,
wherein the light-measuring areas are arranged at a cover plate of the lighting device, wherein the cover plate is arranged at a side of the mounting area spaced apart from the carrier;
wherein the cover plate is light-transmissive and has a lower haze than the light-measuring area; and
wherein the light-measuring areas are formed with a diffusely reflective or diffusely scattering material, which is arranged at a side of the cover plate that faces the plurality of light-emitting diodes.

16. The lighting device according to claim 15 , wherein each color sensor has a reception range having an aperture angle, and wherein exactly one light-measuring area is arranged in the reception range of each color sensor.

17. The lighting device according to claim 16 , wherein the light-measuring areas are illuminated by the light from a plurality of the light-emitting diodes.

18. The lighting device according to claim 16 , wherein an area of each light-measuring area is at most double the magnitude of the area of a projection of the reception range of a color sensor assigned to the light-measuring area onto the cover plate.

19. The lighting device according to claim 16 , wherein a sum of the areas of all the light-measuring areas is at most 10% of the area of the cover plate.

20. A lighting device comprising:
a carrier having a mounting area;
a plurality of light-emitting diodes, wherein at least two of the light-emitting diodes are suitable for emitting light of mutually different colors during operation;
a color sensor configured to detect the light from at least one of the light-emitting diodes during operation;
a light-measuring area that is to be illuminated by the light from at least one of the light-emitting diodes and is configured to reflect and/or scatter at least part of the light;
wherein the light-emitting diodes and the color sensor are arranged on the mounting area;
wherein the light-measuring area is arranged remote from the carrier;
wherein the color sensor is configured to detect mostly the light from at least one of the light-emitting diodes that is reflected and/or scattered by the light-measuring a

Assignees

• Markytan Ales
• Gaertner Christian
• Varga Horst
• Osram Opto Semiconductors Gmbh

Inventors

• Markytan Ales
• Gaertner Christian
• Varga Horst

Classifications

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title

• F21K9/60

  Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction · CPC title

• F21V23/003 Primary

  the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array · CPC title

• F21V23/0457 Primary

  the sensor sensing the operating status of the lighting device, e.g. to detect failure of a light source or to provide feedback to the device · CPC title

• F21V23/00 Primary

  Arrangement of electric circuit elements in or on lighting devices {(characterised by cooling arrangements F21V29/508)} · CPC title