Lighting device

• US 10,290,791 B2
• Filed: 01/26/2012
• Issued: 05/14/2019
• Est. Priority Date: 02/14/2011
• Status: Active Grant

• Current Assignee: LEDVANCE GmbH (MLS Co. Ltd.)
• Original Assignee: LEDVANCE GmbH (MLS Co. Ltd.)
• Inventors: Breidenassel, Nicole, Eckert, Klaus, Hoechtl, Johannes, Streppel, Henrike
• Primary Examiner(s): Campbell, Shaun M
• Application Number:
  US13/985,324
• Publication Number:
  US 20130320365A1
• Time in Patent Office: 2,665 Days
• Field of Search: 257 88, 257 99, 257704, 257712, 257718, 257722, 257730, 362218, 362294, 362362, 362373, 362547
• CPC Class Codes: F21K 9/232 specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
• CPC Class Codes: F21V 17/164 the parts being subjected to bending, e.g. snap joints
• CPC Class Codes: F21V 29/506 of globes, bowls or cover glasses
• CPC Class Codes: F21V 29/70 characterised by passive heat-dissipating elements, e.g. heat-sinks
• CPC Class Codes: F21V 29/74 with fins or blades
• CPC Class Codes: F21V 29/80 with pins or wires
• CPC Class Codes: F21V 29/83 the elements having apertures, ducts or channels, e.g. heat radiation holes
• CPC Class Codes: F21V 3/02 characterised by the shape
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 33/648 the elements comprising fluids, e.g. heat-pipes

Abstract

A lighting device includes a heat sink, through which air can flow transversely to its longitudinal extension and a plurality of semiconductor light sources, in particular light-emitting diodes, arranged on the heat sink, wherein at least two of the semiconductor light sources are aligned in different directions.

Claims

1. A lighting device having a longitudinal extension, the lighting device comprising:

a rear,

a heat sink, through which air flows at least transversely to the longitudinal extension, and

a plurality of semiconductor light sources arranged on the heat sink,

wherein at least two of the semiconductor light sources are aligned in different directions, further comprising a light-transmissive cover for covering the semiconductor light sources and a cooling structure of the heat sink, the cooling structure of the heat sink having outer cooling struts and inner cooling struts, wherein the outer cooling struts are arranged further to the outside in a radial direction than the inner cooling struts, wherein the outer cooling struts and the inner cooling struts protrude into a longitudinal section in which the cover is also located and extend to the rear, wherein air gaps are present between the outer cooling struts and air gaps are present between the inner cooling struts,

wherein parts of the cooling struts of the heat sink and semiconductor light sources are arranged alternately in a circumferential direction,

wherein the heat sink has a front support region for arranging at least one of the semiconductor light sources, wherein the heat sink further comprises a plurality of lateral support regions for respectively at least one of the semiconductor light sources, wherein the front support region and the lateral support regions are aligned differently and wherein the lateral support regions are arranged between respective outer cooling struts,

wherein the lateral support regions and the outer cooling struts are connected to form a closed circumferential edge and wherein the outer cooling struts originating from the closed circumferential edge are inclined inward, and

where the front support region includes a plurality of air passage holes.

2. The lighting device as claimed in claim 1, wherein adjacent lateral support regions and cooling struts are connected to one another.

3. The lighting device as claimed in claim 1, wherein the cover overlaps the front support region and the lateral support regions while leaving the cooling struts free.

4. The lighting device as claimed in claim 1, wherein the cover has a plurality of tab-shaped regions, which each overlap one of the lateral support regions and which run together at a tip of the cover.

5. The lighting device as claimed in claim 1, wherein at least the front support region, at least a part of the cooling struts, and the lateral support regions are integrally connected to one another or form an integral part.

6. The lighting device as claimed in claim 5, wherein the heat sink comprises two parts.

7. The lighting device as claimed in claim 1, wherein the cover is configured to be latched onto the heat sink.

8. The lighting device as claimed in claim 1, further comprising:

in a longitudinal section, in which the light-transmissive cover is located, at least one air passage, which allows an air flow therethrough in the longitudinal section substantially parallel to the longitudinal extension.

9. The lighting device as claimed in claim 1, wherein the lighting device is configured as a retrofit lamp.

10. The lighting device as claimed in claim 1, wherein the semiconductor light sources are light-emitting diodes.

11. The lighting device as claimed in claim 1, wherein the lighting device is configured as an incandescent lamp retrofit lamp.

12. The lighting device of claim 1, wherein the closed circumferential edge and the front support region form a pentagonal basic shape.

13. The lighting device of claim 1, wherein the heat sink includes a peripheral edge and the inner cooling struts extend from a lower side of the peripheral edge.

14. The lighting device of claim 13, wherein the inner cooling struts are bent inward at the peripheral edge and oriented pointing outward with increasing distance from the peripheral edge.