LIGHTING APPARATUS

• US 20140119023A1
• Filed: 09/16/2013
• Published: 05/01/2014
• Est. Priority Date: 10/26/2012
• Status: Abandoned Application

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: Bongho Kim, Hankyu Cho, Hyeuk Chang, Jeahyun Jeong, Sangcheol Lee
• Inventors: CHO, Hankyu, LEE, Sangcheol, CHANG, Hyeuk, JEONG, Jeahyun, KIM, Bongho
• Application Number:
  US14/027,846
• Publication Number:
  US 20140119023A1
• Time in Patent Office: Days
• US Class Current: 362/294
• 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: F21V 29/00 Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems lighting fixtures combined with outlets for air-treatment systems F24F13/078
• CPC Class Codes: F21V 29/505 of reflectors
• 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

Abstract

A lighting apparatus is disclosed. The lighting apparatus is configured such that a flow route of external air passing through a heat sink and retention time of the external air are increased to improve heat dissipation efficiency, a glare phenomenon is prevented, and assemblability of the lighting apparatus is improved.

Claims

1. A lighting apparatus comprising:

a heat sink comprising a plurality of first heat dissipation fins provided in a circumferential direction thereof and a plurality of second heat dissipation fins provided between adjacent twos of the first heat dissipation fins;

a light emitting module disposed in the heat sink;

a first reflective member provided at the heat sink such that the first reflective member is disposed in the heat sink, the first reflective member extending in a side direction of the light emitting module; and

an electronic module to supply power to the light emitting module, wherein

external air flows through spaces defined between the adjacent twos of the first heat dissipation fins, spaces defined between the first heat dissipation fins and the second heat dissipation fins, and spaces defined between adjacent twos of the second heat dissipation fins.

2. The lighting apparatus according to claim 1, further comprising:

first heat dissipation holes provided between the adjacent twos of the first heat dissipation fins; and

second heat dissipation holes provided between the adjacent twos of the second heat dissipation fins, wherein

the first heat dissipation holes are located to face the second heat dissipation fins, and

the second heat dissipation holes are located to face the first heat dissipation fins.

3. The lighting apparatus according to claim 1, wherein the external air flows along a flow route changed at least twice during passage through the heat sink.

4. The lighting apparatus according to claim 1, wherein

the first heat dissipation fins and the second heat dissipation fins are spaced from the first reflective member by predetermined distances, and

the distance between the first heat dissipation fins and the first reflective member is smaller than that between the second heat dissipation fins and the first reflective member.

5. The lighting apparatus according to claim 1, wherein

the first reflective member is provided with a plurality of heat dissipation holes,

the respective heat dissipation holes communicate with spaces defined between adjacent ones of the first heat dissipation fins, and

the external air flows through the heat dissipation holes, spaces defined between the adjacent twos of the first heat dissipation fins, the spaces defined between the first heat dissipation fins and the second heat dissipation fins, and spaces defined between the adjacent twos of the second heat dissipation fins.

6. The lighting apparatus according to claim 1, wherein

the heat sink has a mounting part at which the light emitting module is mounted, and

the first heat dissipation fins and the second heat dissipation fins extend from the mounting part with different radii of curvature.

7. The lighting apparatus according to claim 6, wherein the first heat dissipation fins protrude farther toward the first reflective member than the second heat dissipation fins.

8. The lighting apparatus according to claim 6, wherein each of the first heat dissipation fins comprises a curved part extending from the mounting part at a predetermined radius of curvature and a plane part bent from the curved part.

9. The lighting apparatus according to claim 8, wherein

the first reflective member comprises a hemispherical reflective part facing the curved part of each of the first heat dissipation fins and a rim part facing the plane part of each of the first heat dissipation fins, and

the rim part is provided with a plurality of heat dissipation holes arranged in a circumferential direction thereof.

10. The lighting apparatus according to claim 9, wherein

the heat dissipation holes are provided at positions corresponding to spaces defined between adjacent ones of the plane parts, and

the external air flows through the heat dissipation holes, the spaces defined between the adjacent twos of the first heat dissipation fins, the spaces defined between the first heat dissipation fins and the second heat dissipation fins, and the spaces defined between the adjacent twos of the second heat dissipation fins.

11. The lighting apparatus according to claim 9, further comprising a first fastening member fixed to the rim part through the plane part.

12. The lighting apparatus according to claim 1, further comprising a second fastening member fixed to the electronic module through the heat sink.

13. The lighting apparatus according to claim 2, wherein the heat sink comprises:

a first heat sink having a plurality of first heat dissipation holes and a plurality of first heat dissipation fins; and

a second heat sink having a plurality of second heat dissipation holes and a plurality of second heat dissipation fins, the second heat sink being mounted at the first heat sink such that at least a portion of the second heat sink is spaced from the first heat sink by a predetermined distance.

14. The lighting apparatus according to claim 13, wherein

the first heat sink and the second heat sink are formed in a hemispherical shape, a sectional area of which increases with increasing distance from the light emitting module, and

the second heat sink is disposed in the first heat sink.

15. The lighting apparatus according to claim 14, wherein

the second heat sink is provided with a first catching protrusion, and

the first heat sink is provided with a second catching protrusion coupled to the first catching protrusion according to rotation of the second heat sink.

16. The lighting apparatus according to claim 13, further comprising:

a guide fin extending from each of the first heat dissipation fins toward the second heat sink, wherein

the guide fin is disposed at a predetermined angle to each of the first heat dissipation fins.

17. The lighting apparatus according to claim 16, wherein the guide fin is formed such that a length of the guide fin protruding toward the second heat sink increases with increasing distance from the light emitting module.

18. The lighting apparatus according to claim 1, further comprising a second reflective member to reflect light emitted from the light emitting module to the first reflective member.

19. The lighting apparatus according to claim 18, wherein the second reflective member has a greater diameter than the light emitting module.

20. The lighting apparatus according to claim 18, further comprising:

a connection member to space the second reflective member from the light emitting module by a predetermined distance, wherein

the connection member is formed of a light transmitting material.