Lighting device

• US 8,471,443 B2
• Filed: 11/08/2010
• Issued: 06/25/2013
• 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, Hong, Sungho, Kang, Seok Jin, Kim, Dong Soo
• Primary Examiner(s): RALEIGH, DONALD L
• Application Number:
  US12/941,507
• Publication Number:
  US 20110109215A1
• Time in Patent Office: 960 Days
• Field of Search: 257/40, 257/72, 257 98-100, 257642-643, 257/759, 313498-512, 313/45, 315/169.1, 315/169.3, 427/58, 427/64, 427/66, 427532-535, 427/539, 428690-691, 428/917, 438 26- 29, 438/34, 438/82, 438/455, 445 24- 25, 362543-549, 362/555, 362/800, 36224901-24903, 362/362, 362/373
• US Class Current: 313/45
• 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 9/238 Arrangement or mounting of circuit elements integrated in the light source
• CPC Class Codes: F21V 19/0035 the fastening means being capable of simultaneously attaching of an other part, e.g. a housing portion or an optical component
• CPC Class Codes: F21V 23/002 Arrangements of cables or conductors inside a lighting device, e.g. means for guiding along parts of the housing or in a pivoting arm
• CPC Class Codes: F21V 23/006 the substrate being distinct from the light source holder
• 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 29/89 Metals
• CPC Class Codes: F21Y 2103/33 annular
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

Disclosed is a lighting device. The lighting device includes:

• • a substrate;
  • a light emitting device disposed on the substrate;
  • a driving unit supplying electric power to the light emitting device and connected to the substrate through a conductive line;
  • a heat radiating body radiating heat from the light emitting devices and comprising a hole through which the conductive line to pass; and
  • an insulator coupled with the hole and having a opening.

Claims

1. A lighting device comprising:

a substrate;

a light emitting device disposed on the substrate;

a driver to supply electric power to the light emitting device, wherein the driver is coupled to the substrate through a conductive line and includes one or more circuits to assist in conditioning the electric power for supply to the light emitting device;

a heat radiator to radiate heat from the light emitting device and comprising;

a hole through which the conductive line passes,

a first receiving cavity in which the driver is disposed, and

a second receiving cavity in which the substrate is disposed;

an inner case, having the driver therein, disposed in the first receiving cavity; and

an insulator coupled to the hole and having an opening, wherein the light emitting device includes an LED, wherein an outer circumferential surface of the insulator is spaced apart from an inner circumferential surface of the heat radiator.

2. The lighting device of claim 1, wherein the inner case overlaps the wall of the heat radiator by a length greater than a length of the conductive line.

3. The lighting device of claim 1, wherein:

the insulator has a ring shape,

the insulator has first and second ends with respective first and second diameters, with the first diameter being smaller than the second diameter, and

the hole in the insulator having third and fourth ends with different diameters that are aligned with the first and second ends of the insulator, respectively.

4. The lighting device of claim 1, wherein a diameter of an upper part of the hole is different from that of a lower part of the hole.

5. The lighting device of claim 1, wherein the insulator insulates the heat radiator and the conductive line and wherein the insulator is received in the hole.

6. The lighting device of claim 1, wherein a diameter of a part of the insulator is equal or less than that of the hole.

7. The lighting device of claim 1, wherein the insulator is elastic.

8. The lighting device of claim 1, wherein a side surface of the insulator is tapered or stepped.

9. The lighting device of claim 1, wherein an outer circumferential surface of the insulator corresponds to a side wall of the hole.

10. The lighting device of claim 1, further comprising

a guide member for fixing the substrate to the heat radiator,

wherein one side of the guide member comprises an air flow hole on one side thereof.

11. The lighting device of claim 1, further comprising

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

12. The lighting device of claim 1, wherein an outer surface of the heat radiator comprises at least one heat radiating fin.

13. The lighting device of claim 1, wherein

the inner case overlaps a wall of the heat radiator,

a horizontal axis passes through the first receiving cavity, the inner case, at least one circuit of the driver, and the wall of the heat radiator which is adjacent the first receiving cavity and which overlaps the inner case.

14. The lighting device of claim 1, further comprising:

an electrode to receive power to be conditioned by the one or more driver circuits,

wherein the inner case is coupled to extend from the electrode,

wherein the inner case overlaps substantially a wall of the heat radiator, and

wherein the horizontal axis passes through the first receiving cavity, substantially a midpoint of the inner case, at least one circuit of the driver, and the wall of the heat radiator which is adjacent the first receiving cavity and which overlaps the inner case.

15. A lighting device comprising:

a substrate;

a light emitting device disposed on the substrate;

a driver to supply electric power to the light emitting device and coupled to the substrate through a conductive line;

a heat radiator to radiate heat generated from the light emitting device and comprising;

a hole for allowing the conductive line to pass through so as to allow the electric power to be supplied to the light emitting device,

a first receiving cavity in which the driver is disposed, and

a second receiving cavity in which the substrate is disposed;

an inner case to prevent the heat radiator from electrically contacting the driver, and

an insulator to prevent the heat radiator from electrically contacting the conductive line, wherein the light emitting device includes an LED, wherein the heat radiator includes an upper surface coupled to the substrate, wherein the hole is formed on the upper surface of the heat radiator, and wherein an upper surface of the insulator and the upper surface of the heat radiator are substantially disposed on a same plane.

16. The lighting device of claim 15, wherein the length of the conductive line is less than one half a length of a wall of the heat radiator that surrounds the first receiving cavity.

17. The lighting device of claim 15, wherein an inner circumferential surface of the heat radiator is formed by the hole, and wherein the inner circumferential surface surrounds the insulator.

18. The lighting device of claim 15, wherein the insulator is elastic.

19. A lighting device comprising:

a heat radiator comprising a first receiving cavity on one side thereof and a second receiving cavity on the other side thereof;

a light emitter substrate disposed in the second receiving cavity;

a driver disposed in the first receiving cavity and electrically connected to the light emitter substrate through a conductive line; and

an inner case, which includes the driver, disposed in the first receiving cavity,

wherein the heat radiator comprises;

a hole on one side of the first receiving cavity such that the conductive line passes through the hole; and

an insulator surrounded by an inner circumferential surface of the heat radiator,

wherein the inner circumferential surface of the heat radiator is being formed by the hole, wherein the light emitter includes an LED, and wherein an outer circumferential surface of the insulator is spaced apart from the inner circumferential surface of the heat radiator.