Lighting device

• US 8,829,771 B2
• Filed: 11/08/2010
• Issued: 09/09/2014
• Est. Priority Date: 11/09/2009
• Status: Active Grant

• Current Assignee: Suzhou Lekin Semiconductor Company Limited
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: Kang, Seok Jin, Choi, Tae Young, Hong, Sungho, Kim, Dong Soo
• Primary Examiner(s): Hanley, Britt D
• Assistant Examiner(s): Snyder, Zachary J
• Application Number:
  US12/941,493
• Publication Number:
  US 20110109217A1
• Time in Patent Office: 1,401 Days
• Field of Search: 313/11, 313/42, 313/46, 313/45
• US Class Current: 313/46
• CPC Class Codes: F21K 9/23 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 Class Codes: F21K 9/60 Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
• CPC Class Codes: F21V 29/15 Thermal insulation
• CPC Class Codes: F21V 29/70 characterised by passive heat-dissipating elements, e.g. heat-sinks
• CPC Class Codes: F21V 29/713 in direct thermal and mechanical contact of each other to form a single system
• CPC Class Codes: F21V 29/74 with fins or blades
• CPC Class Codes: F21V 29/83 the elements having apertures, ducts or channels, e.g. heat radiation holes
• CPC Class Codes: F21V 5/04 of lens shape
• CPC Class Codes: F21V 5/10 comprising photoluminescent material
• CPC Class Codes: F21V 7/04 Optical design
• CPC Class Codes: F21Y 2105/00 Planar light sources
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2924/00012 Relevant to the scope of the group, the symbol of which is combined with the symbol of this group
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2924/181 Encapsulation

Abstract

A lighting device includes a heat sink for dissipating heat from a light source. The heat sink is located between an inner case and an outer case, and a power controller is located in the inner case. The light source may include one or more light emitting diodes.

Claims

1. A lighting device comprising:

a heat radiating body which comprises a base, a cylindrical body coupled to the base, a first receiving recess, and a second receiving recess;

a light source disposed in the second receiving recess of the heat radiating body;

an outer case being spaced apart from an outer surface of the heat radiating body and surrounding the heat radiating body;

an inner case including an inner body disposed in the first receiving recess of the heat radiating body and a first guide coupled to extend from the inner body;

a power controller which is disposed in the inner body of the inner case and which is electrically connected to the light source;

a second guide coupled to the heat radiating body and having at least one of a hole or a recess; and

a sealer disposed in the second receiving recess between the light source and the second guide, wherein the light source includes an LED.

2. The lighting device of claim 1, wherein the heat radiating body comprises at least one heat radiating fin coupled to the outer surface of the heat radiating body.

3. The lighting device of claim 1, wherein the second guide comprises:

a base extending in a first direction, and

a cover extending coupled to the base and extending in a second direction different from the first direction.

4. The lighting device of claim 1, wherein the outer case comprises a projection coupled to the first guide of the inner case.

5. The lighting device of claim 1, wherein the outer case comprises:

an outer wall which is spaced apart from the heat radiating body and surrounds the heat radiating body, a ring-shaped second guide coupled to the first guide, and at least one projection connecting the outer wall with the second guide of the outer case.

6. The lighting device of claim 1, wherein, a distance between the heat radiating body and the outer case increases or decreases in a direction which light is emitted from the light source.

7. The lighting device of claim 1, wherein the light source comprises a plurality of light emitting devices and a substrate comprising a multi layer structure in which the plurality of the light emitting devices are disposed,

wherein the substrate comprises conductive layers disposed on an upper part and a lower part of the substrate respectively and comprises insulation layers disposed between the conductive layers, and

wherein a distance from a central axis of the substrate to an outermost end of at least one of the conductive layers is less than a distance from the central axis of the substrate to an outermost end of at least one of the insulation layers.

8. The lighting device of claim 7, wherein a difference between the distance from the central axis of the substrate to the outermost end of said at least one of the conductive layers and the distance from the central axis of the substrate to the outermost end of said at least one of the insulation layers is at least 5 mm.

9. The lighting device of claim 7, wherein the substrate comprises:

a first conductive layer to which the plurality of the light emitting devices are coupled;

a first insulation layer disposed under the first conductive layer;

a FR 4 copper-clad laminate (CCL) sheet disposed under the first insulation layer;

a second insulation layer disposed under the FR 4 copper-clad laminate sheet;

a second conductive layer disposed under the second insulation layer and coupled to the bottom surface of a receiving groove; and

a via formed to pass through the first insulation layer, the FR 4 copper-clad laminate sheet and the second insulation layer in order to electrically connect the first conductive layer with the second conductive layer.

10. The lighting device of claim 9, wherein the substrate further comprises:

a third conductive layer disposed between the first insulation layer and the FR4 copper-clad laminate sheet; and

a fourth conductive layer disposed between the FR4 copper-clad laminate sheet and the second insulation layer.

11. The lighting device of claim 7, wherein the substrate further comprises

a solder mask coupled to the conductive layer disposed on an upper part of the substrate except areas on which the plurality of the light emitting devices are disposed and the first insulation layer except areas on which the first conductive layer disposed on an upper part of the substrate is disposed.

18. The lighting device of claim 3, wherein:

the cover of the second guide comprises a first cover and a second cover,

a predetermined gap is between the first cover and the second cover, and

the recess is formed in at least one of the first cover or the second cover.

12. A lighting device comprising:

a heat sink having a receiving recess;

a light source coupled to a part of the heat sink;

a guide disposed on the light source and coupled to the heat sink and having a first air flow path;

an outer case surrounding the heat sink and the guide; and

a power controller disposed in the receiving recess of the heat sink and electrically connected to the light source; and

wherein a second air flow path is formed between the outer case and the heat sink and formed between the outer case and the guide, wherein the first air flow path communicates with the second air flow path, and wherein the light source includes an LED.

13. The lighting device of claim 12, wherein the heat sink comprises at least one heat radiating fin.

14. The lighting device of claim 12, wherein the guide comprises a base extending in a first direction and having an opening and a cover extending in a second direction different from the first direction relative to the base, wherein at least one of the base or the cover includes the first air flow path and wherein the first air flow path includes at least one of a hole or a recess.

19. The lighting device of claim 13, wherein the outer case is spaced apart from the heat radiating fin.

20. The lighting device of claim 19, wherein the heat radiating fin has substantially a shape of a circular arc.

15. A lighting device comprising:

a heat radiating body comprising a lower portion and a upper portion having a receiving recess;

a light source disposed on the lower portion of heat radiating body;

an outer case surrounding the heat radiating body; and

a power controller disposed in the receiving recess of the heat radiating body and electrically connected to the light source, wherein;

the outer case comprises an outer wall spaced apart from the heat radiating body,

a diameter of between the outer wall and the heat radiating body becomes narrower in a direction from the lower portion of heat radiating body to the upper portion of heat radiating body, and wherein the light source includes an LED.

16. The lighting device of claim 15, wherein the heat radiating body comprises a plurality of a heat radiating fin extending from an outer surface of heat radiating body, and wherein the outer wall of the outer case is spaced apart from the heat radiating fin.

17. The lighting device of claim 16, wherein the heat radiating fin has substantially a shape of a circular arc.