Lighting device

Patent metadata

Field	Value
Publication number	US-9657934-B2
Application number	US-201414908023-A
Country	US
Kind code	B2
Filing date	Aug 14, 2014
Priority date	Aug 22, 2013
Publication date	May 23, 2017
Grant date	May 23, 2017

Abstract

A lighting device or a lamp bulb ( 100, 200 ) comprises at least one light source ( 101 ) and a driver assembly ( 108 ), said driver assembly comprising driver electronics; wherein during operation of the light source, a distance between an optical axis ( 120 ) of the lighting device and a heat flow of the lighting device is less than a distance between the optical axis ( 120 ) and a component of the driver electronics having the highest temperature sensitivity.

First claim

The invention claimed is:

1. A lighting device comprising:
at least one light source;
a driver assembly, said driver assembly comprising driver electronics; and
a heat sink component having a bottom and a sidewall extending from the bottom;
wherein during operation of the light source, a distance between an optical axis of the lighting device and a heat flow of the lighting device is less than a distance between the optical axis and a component of the driver electronics having the highest temperature sensitivity; and
wherein the sidewall comprises a patch corresponding to a mounting position of the driver assembly.

2. The lighting device according to claim 1 , wherein the heat sink component further has a concave part extending from the bottom into the heat sink component, and wherein the at least one light source thermally contacts the concave part; wherein the heat sink component comprises a heat sink opening, and the heat sink opening comprises a plurality of holes in the bottom of the heat sink component between the concave part and the sidewall; and
a cover provided on the sidewall and opposite to the bottom thereby defining an air chamber between the cover, the sidewall, the bottom and the concave part; wherein the cover comprises a cover opening, and the air chamber forms a channel between the cover opening and the heat sink opening to allow a flow of air between the cover opening and the heat sink opening or vice versa;
wherein the driver assembly is arranged in the air chamber.

3. The lighting device according to claim 2 , further comprising a housing having a plurality of first holes;
wherein the concave part has a side surface and a top surface, and wherein the side surface of the concave part forms a portion of the air chamber; wherein a plurality of second holes is formed in the side surface to communicate with the plurality of first holes; and wherein
a further channel is formed between the first holes and the second holes to allow a further flow of air between the first and the second holes, or vice versa, during operation of the light source; the distance between an optical axis of the lighting device and the further flow of air is less than the distance between the optical axis and the driver assembly.

4. The lighting device according to claim 2 , wherein the driver assembly is arranged in a compartment within the air chamber.

5. The lighting device according to claim 2 , wherein the cover comprises a rim at its outer periphery, and the cover opening comprises a plurality of holes in the rim.

6. The lighting device according to claim 2 , wherein the cover is of a thermally conductive material which thermally contacts the sidewall of the heat sink component.

7. The lighting device according to claim 2 , wherein the cover comprises a recess which accommodates the at least one light source, and the recess thermally contacts the concave part.

8. The lighting device according to claim 7 , wherein the recess further comprises at least one optical element for the at least one light source.

9. The lighting device according to claim 8 , wherein the at least one optical element is selected from a group comprising a diffuser, a reflector, a lens, a collimator or a combination thereof.

10. The lighting device according to claim 2 , wherein a cross section of the channel is larger than at least one of the cover opening and the heat sink opening.

11. The lighting device according to claim 2 , wherein the at least one light source is thermally coupled to a PCB, which PCB extends into the air chamber, and which PCB has a plurality of PCB openings to allow the flow of air between the cover opening and the heat sink opening or vice versa.

12. The lighting device according to claim 11 , wherein the PCB comprises a thermally conductive material, so that the thermal conductivity of the PCB is at least 28 W/mK measured along the surface of the PCB.

13. A luminaire comprising a lighting device according to claim 1 .

Assignees

• Philips Lighting Holding Bv

Inventors

• Xiong Yan
• Jiang Qingqing

Classifications

• F21V29/503

  of light sources (cooling arrangements structurally associated with gas-discharge or vapour-discharge lamps H01J61/52; cooling arrangements structurally associated with electric incandescent lamps H01K1/58; cooling arrangements structurally associated with light-emitting diodes H10H20/858) · CPC title

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title

• F21V29/506

  of globes, bowls or cover glasses · CPC title

• F21K9/23

  Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings · CPC title

• F21V29/508

  of electrical circuits · CPC title