Lamp

• US 7,874,697 B2
• Filed: 08/06/2007
• Issued: 01/25/2011
• Est. Priority Date: 08/09/2006
• Status: Expired due to Fees

• Current Assignee: OSRAM GmbH (Ams-Osram AG)
• Original Assignee: OSRAM GmbH (Ams-Osram AG)
• Inventors: Biebel, Ulrich, Custodis, Udo, Henger, Ulrich, Clark, Jens
• Primary Examiner(s): O Shea; Sandra L
• Assistant Examiner(s): MCMANMON, MARY ELIZABETH
• Application Number:
  US12/309,573
• Publication Number:
  US 20090243455A1
• Time in Patent Office: 1,268 Days
• Field of Search: 362/228, 362/249.02, 362/260, 362/217.02, 362/219, 362/221, 362/224, 362/225, 36221705-21708, 362/294, 362/345, 362/547, 362/800
• US Class Current: 362/225
• CPC Class Codes: F21S 8/04 intended only for mounting on a ceiling or the like overhead structures F21S8/02 takes precedence; details of ceiling bases F21V21/03
• CPC Class Codes: F21V 13/02 Combinations of only two kinds of elements
• CPC Class Codes: F21V 29/505 of reflectors
• CPC Class Codes: F21V 29/76 with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
• CPC Class Codes: F21V 29/89 Metals
• CPC Class Codes: F21V 7/0008 providing for indirect lighting
• CPC Class Codes: F21V 7/0016 on lighting devices that also provide for direct lighting, e.g. by means of independent light sources, by splitting of the light beam, by switching between both lighting modes
• CPC Class Codes: F21V 7/005 with an elongated shape to cooperate with linear light sources
• CPC Class Codes: F21Y 2103/37 U-shaped
• CPC Class Codes: F21Y 2113/13 comprising an assembly of point-like light sources
• CPC Class Codes: F21Y 2113/20 of different form
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H05B 35/00 Electric light sources using a combination of different types of light generation

Abstract

The invention relates to a lamp with a first light source generating white light, comprising at least one fluorescent lamp (2) or an incandescent lamp, as well as a second light source comprising at least one set of light-emitting diodes (4, 5; 300), and comprising a reflector (1) for the light emitted by the light sources, wherein a cooling device (6, 7) for the at least one set of light-emitting diodes (4, 5) is attached to the reflector (1) and is thermally linked to the at least one set of light-emitting diodes (4, 5), and wherein the lamp comprises a translucent and light-dispersing medium (3) in the optical path of the light emitted by the lamp.

Claims

1. A luminaire having a first light source, which generates white light and comprises at least one fluorescent lamp or one incandescent lamp, and having a second light source, which comprises at least one light-emitting diode arrangement, and having a reflector for the light emitted by the light sources, a cooling device for the at least one light-emitting diode arrangement being provided that is thermally coupled to the at least one light-emitting diode arrangement and is arranged on the reflector, and the luminaire comprising a transparent, light-scattering means that is arranged in the beam path of the light emitted by the luminaire;

said reflector having an inner side that faces said light sources and is designed to reflect light, and an outer side averted from said light sources, wherein said cooling device is arranged on the outer side of said reflector; and

wherein said at least one light-emitting diode arrangement is mounted on a surface of said cooling device which faces said outer side of the reflector, and said at least one light-emitting diode arrangement projecting through cutouts in said reflector.

2. The luminaire as claimed in claim 1, in which the cooling device is fastened on the reflector.

3. The luminaire as claimed in claim 1, in which the cooling device is arranged at the edge of a light exit opening of the reflector.

4. The luminaire as claimed in claim 1, in which the at least one light-emitting diode arrangement (4, 5;

300) is arranged on the inner side (10;

10′

;

101) of the reflector (1;

1′

;

100).

5. The luminaire as claimed in claim 1, in which a thermal insulation layer (8) is arranged between the outer side of the reflector (1;

100) and the surface (61) of the cooling device (6, 7;

400) provided with the at least one light-emitting diode arrangement (4, 5;

300).

6. The luminaire as claimed in claim 1, in which the cooling device (6, 7) has cooling ribs (60, 70) that are arranged and aligned in such a way that they lie outside the beam path of the light emitted by the luminaire.

7. The luminaire as claimed in claim 1, in which the cooling device is designed as a cooling plate (6′

) that is arranged and shaped in such a way that it lies outside the beam path of the light emitted by the luminaire.

8. The luminaire as claimed in claim 7, in which the cooling plate (6′

) and the reflector (1′

) form a cavity or interspace (93).

9. The luminaire as claimed in claim 1, in which the at least one light-emitting diode arrangement (4, 5) comprises a combination of red or orange shining light-emitting diodes (41, 51) with green shining light-emitting diodes (42, 52), and the first light source comprises one or more fluorescent lamps (2, 2′

).

10. The luminaire as claimed in claim 1, in which the at least one light-emitting diode arrangement comprises light-emitting diodes that emit warm white light during their operation, and the first light source comprises one or more fluorescent lamps.

11. The luminaire as claimed in claim 9 or 10, in which the at least one fluorescent lamp (2, 2′

) is designed in such a way that it emits daylight-like light during its operation.

12. The luminaire as claimed in claim 1, in which the at least one light-emitting diode arrangement (300) comprises a combination of red, green and blue shining light-emitting diodes.

13. The luminaire as claimed in claim 12, in which the first light source comprises one or more fluorescent lamps (2, 2′

, 200).

14. The luminaire as claimed in claim 1, in which the transparent, light-scattering means is designed as a cover pane (3;

500) for a light exit opening of the reflector (1;

1′

;

100).

15. The luminaire as claimed in claim 1, in which a color sensor (91) that serves to control the color temperature or the color of the light emitted by the luminaire is coupled to the luminaire.

16. The luminaire as claimed in claim 1, in which a brightness sensor (92) that serves to control the brightness of the light emitted by the luminaire is coupled to the luminaire.

17. The luminaire as claimed in claim 1, in which the reflector (1, 1′

) is of trough-like design, the first light source (2, 2′

) is aligned parallel to the longitudinal extent of the trough-like reflector (1, 1′

), and the second light source is formed by two light-emitting diode arrangements (4, 5) that are arranged on both sides of the first light source (2, 2′

) and respectively extend in a fashion parallel to the longitudinal extent of the reflector (1, 1′

).

18. The luminaire as claimed in claim 17, in which the cooling devices (6, 7) of the two light-emitting diode arrangements (4, 5) are respectively arranged along a reflector edge running parallel to the longitudinal extent of the trough-like reflector (1, 1′

).

19. The luminaire as claimed in claim 17 or 18, in which the two light-emitting diode arrangements (4, 5) are respectively arranged along a reflector section (11, 12, 11′

, 12′

) bent back in the direction of the inside trough bottom, such that, before leaving the luminaire, the light emitted by the light-emitting diode arrangements (4, 5) is reflected at least once on the inner side (10;

10′

), designed to reflect light, of the reflector (1;

1′

).

20. The luminaire as claimed in claim 1, in which the cooling devices (6, 7) of the two light-emitting diode arrangements (4, 5) extend along the outer sides of the bent-back reflector sections (11, 12;

11′

, 12′

).

21. The luminaire as claimed in claim 1, in which the light exit opening of the reflector (1;

1′

) is arranged between the bent-back reflector sections (11, 12;

11′

, 12′

).

22. The luminaire as claimed in claim 1, in which the reflector (100) is of hood-like and substantially rotationally symmetrical design, and the first light source (200) is arranged along the rotation axis of the reflector (100), and the second light source comprises at least one annular or annular segment light-emitting diode arrangement (300) that is arranged on the inner side (101) and coaxially with the rotation axis of the reflector (100).

23. The luminaire as claimed in claim 22, in which the cooling device (400) for the at least one annular or annular segment light-emitting diode arrangement (300) is arranged on the outer side of the reflector (100), at the level of the light-emitting diode arrangement (300).

24. The luminaire as claimed in either of claims 22 and 23, in which the first light source is a fluorescent lamp (200) with a base at one end and whose axis of longitudinal extent is aligned parallel to the rotation axis of the reflector (100).

25. The luminaire as claimed in claim 24, in which the fluorescent lamp with a base at one end is designed as a compact fluorescent lamp (200) with an operating device arranged in the base.

26. The luminaire as claimed in claim 1, in which the reflector (100) is fixed on the base (201) of the fluorescent lamp (200).