LIGHTING DEVICE

• US 20110109217A1
• Filed: 11/08/2010
• Published: 05/12/2011
• 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: Choi, Tae Young, Kim, Dong Soo, Kang, Seok Jin, Hong, Sungho
• Granted Patent: US 8,829,771 B2
• Time in Patent Office: Days
• 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

Disclosed is a lighting device. The lighting device includes:

• • a heat radiating body which comprises a base and a cylindrical body extending to the base;
  • a light source disposed on a part of the heat radiating body; and
  • an outer case being spaced apart from an outer surface of the heat radiating body and surrounding the heat radiating body.

Claims

1. A lighting device comprising:

a heat radiating body which comprises a base and a cylindrical body extending to the base;

a light source disposed on a part of the heat radiating body; and

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

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

3. The lighting device of claim 1, further comprising a guide member which surrounds an outer lower part of the heat radiating body in order to fix the light source to the base, and which comprises at least one hole on the surface thereof, the hole communicating a space of between the heat radiating body and the outer case with the outside of the guide member.

4. The lighting device of claim 3, further comprising a ring surrounding the circumference of the light source in such a manner as to seal a space between the light source and the guide member.

5. The lighting device of claim 3, wherein the guide member comprises a base including an opening and a cover extending to the base, and wherein at least one of the base and/or the cover comprise at least one hole.

6. The lighting device of claim 1, further comprising a guide member which surrounds an outer lower part of a heat radiating fin, wherein the guide member comprises a base comprising an opening and a cover extending to the base, and wherein the cover comprises at least one groove communicating a space of between the heat radiating body and the outer case with the outside of the guide member.

7. The lighting device of claim 6, further comprising a sealing means surrounding the circumference of the light source in such a manner as to seal a space between the light source and the guide member.

8. The lighting device of claim 1, further comprising an inner case comprising a terminal, an inner body extending from a part of the terminal, and a first guide extending to the outer surface of the inner body, and wherein the outer case comprises a projection coupled to the first guide.

9. The lighting device of claim 1, further comprising an inner case comprising a terminal, an inner body extending from a part of the terminal, and a first guide extending to the outer surface of the inner body,

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 coupling with the first guide, and

at least one projection connecting the outer wall with the second guide.

10. 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 a light emits from the light source to an outside.

11. 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 the central axis of the substrate to the outermost end of the conductive layer is less than a distance from the central axis of the substrate to the outermost end of the insulation layer.

12. The lighting device of claim 11, wherein a difference between the distance from the central axis of the substrate to the outermost end of the conductive layer and the distance from the central axis of the substrate to the outermost end of the insulation layer is at least 5 mm.

13. The lighting device of claim 11, wherein the substrate comprises:

a first conductive layer on which the plurality of the light emitting devices;

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 disposed on 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.

14. The lighting device of claim 13, 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.

15. The lighting device of claim 11, wherein the substrate further comprises a solder mask formed on both 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.

16. A lighting device comprising:

a heat radiating body

a light source disposed on a part of the heat radiating body;

an outer case surrounding the outside of the heat radiating body; and

a guide member fixing the light source to the heat radiating body, wherein the guide member comprises an air flow path allowing air to flow between the heat radiating body and the outer case.

17. The lighting device of claim 16, wherein the heat radiating body comprises at least one heat radiating fin on the outer surface thereof.

18. The lighting device of claim 16, wherein the guide member comprises a base comprising an opening and a cover extending perpendicular to the base, and wherein the air flow path is formed in the base and/or the cover by one or more holes.

19. The lighting device of claim 16, further comprising a ring surrounding the circumference of the light source in such a manner as to seal a space between the light source and the guide member.

20. A lighting device comprising:

a light source;

a heat radiating body disposed on one side of the light source; and

an outer case surrounding the outside of the heat radiating body so that an air flow path is formed between the outer case and the heat radiating body.