LIGHTING DEVICE

• US 20140307427A1
• Filed: 03/24/2014
• Published: 10/16/2014
• Est. Priority Date: 04/11/2013
• Status: Abandoned Application

• Current Assignee: LG Innotek Company Limited (LG Corporation)
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: JOO, Keun Tak, LIM, Dong Nyung, LEE, Sang Hoon
• Application Number:
  US14/223,629
• Publication Number:
  US 20140307427A1
• Time in Patent Office: Days
• US Class Current: 362/186
• 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 9/232 specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
• CPC Class Codes: F21K 9/238 Arrangement or mounting of circuit elements integrated in the light source
• CPC Class Codes: F21V 23/006 the substrate being distinct from the light source holder
• CPC Class Codes: F21V 23/007 enclosed in a casing
• CPC Class Codes: F21V 23/023 Power supplies in a casing F21V23/003 takes precedence
• CPC Class Codes: F21V 29/506 of globes, bowls or cover glasses
• CPC Class Codes: F21V 29/507 of means for protecting lighting devices from damage, e.g. housings
• 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 29/773 the planes containing the fins or blades having the direction of the light emitting axis
• CPC Class Codes: F21V 29/86 Ceramics or glass
• CPC Class Codes: F21V 29/87 Organic material, e.g. filled polymer composites; Thermo-conductive additives or coatings therefor
• CPC Class Codes: F21V 3/00 Globes; Bowls; Cover glasses with refracting properties F21V5/00; with reflecting properties F21V7/00; characterised by cooling arrangements F21V29/506
• CPC Class Codes: F21V 3/04 characterised by materials, surface treatments or coatings
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

A lighting device may be provided that includes: a heat sink having an optical transmittance; a light source module including a substrate disposed on the heat sink and a light emitting device disposed on the substrate; and a cover which is disposed on the light source module and outwardly emits a part of light from the light source module. The cover has an inner surface which reflects a part of light from the light emitting device. The heat sink receives the light from the inner surface of the cover and outwardly emits a part of the received light.

Claims

1. A lighting device comprising:

a heat sink having an optical transmittance;

a light source module including a substrate disposed on the heat sink and a light emitting device disposed on the substrate; and

a cover which is disposed on the light source module and outwardly emits a part of light from the light source module,

wherein the cover has an inner surface which reflects a part of light from the light emitting device, and wherein the heat sink receives the light from the inner surface of the cover and outwardly emits a part of the received light.

2. The lighting device of claim 1, wherein the heat sink comprises:

a first heat radiation part including an upper portion on which the light source module is disposed, a lower portion connected to the upper portion, and a receiver; and

a second heat radiation part including an inner portion which is disposed in the receiver of the first heat radiation part, and an outer portion which encloses the lower portion of the first heat radiation part,

wherein the second heat radiation part has the optical transmittance, and wherein the outer portion of the second heat radiation part emits outwardly a part of light incident from the inner surface of the cover.

3. The lighting device of claim 2, wherein the first heat radiation part and the second heat radiation part are integrally formed with each other.

4. The lighting device of claim 2, further comprising a power supply unit supplying power to the light source module, wherein the second heat radiation part is formed of an insulating material, and wherein the inner portion of the second heat radiation part comprises a receiver receiving the power supply unit.

5. The lighting device of claim 4,

wherein the power supply unit comprises a support plate and a plurality of parts disposed on the support plate,

wherein the second heat radiation part further comprises a connection portion which is formed of an insulating material and allows the second heat radiation part to be connected to a base,

wherein the connection portion has at least one hole, and

wherein the support plate has a protrusion which has a hook structure and is inserted into the hole of the connection portion.

6. The lighting device of claim 4,

wherein the power supply unit comprises a support plate and a plurality of parts disposed on the support plate,

wherein the second heat radiation part comprises a first guide and a second guide which are disposed in the receiver of the second heat radiation part and guide both sides of one edge of the support plate, and

wherein an interval between the first guide and the second guide is reduced toward a bottom surface of the receiver of the second heat radiation part from an entrance of the receiver of the second heat radiation part.

7. A lighting device comprising:

a heat sink including a top surface and an outer circumferential portion disposed around the top surface;

a light source module including a substrate which is disposed on the top surface and on a portion of the outer circumferential portion, and a light emitting device which is disposed on the substrate; and

a cover which is coupled to the outer circumferential portion and disposed on the light source module,

wherein the cover reflects a part of light from the light emitting device to the outer circumferential portion, and wherein the outer circumferential portion transmits at least a part of the incident light.

8. The lighting device of claim 7, wherein the top surface of the heat sink is disposed on the same plane with a top surface of the outer circumferential portion of the heat sink.

9. The lighting device of claim 7, wherein the top surface of the heat sink is formed of a metallic material, and wherein the outer circumferential portion of the heat sink is formed of a resin material.

10. The lighting device of claim 7, wherein the heat sink comprises:

a first heat radiation part which comprises an upper portion including the top surface, a lower portion connected to the upper portion, and a receiver; and

a second heat radiation part comprising an inner portion disposed in the receiver of the first heat radiation part, and an outer portion which encloses the first heat radiation part and has the outer circumferential portion,

wherein the first heat radiation part has a first thermal conductivity, wherein the second heat radiation part has a second thermal conductivity, and wherein the first thermal conductivity is greater than the second thermal conductivity.

11. A lighting device comprising:

a light source module which includes a substrate and a light emitting device disposed on the substrate;

a hemispherical cover which is disposed on the light source module; and

a heat sink on which the light source module is disposed and which is coupled to the cover,

wherein the cover includes a first cover part disposed on the substrate, and a second cover part connected to an outer circumference of the first cover part,

wherein an optical reflectance of the first cover part is greater than an optical reflectance of the second cover part, and

wherein the first cover part includes an optical part reflecting at least a part of light from the light emitting device out of a top surface of the substrate.

12. The lighting device of claim 11, wherein the second cover part further comprises an optical part reflecting at least a part of light from the light emitting device out of the top surface of the substrate.

13. The lighting device of claim 11, wherein a light diffusion rate of the first cover part is higher than a light diffusion rate of the second cover part.

14. The lighting device of claim 11, wherein the optical part has a prism shape.

15. The lighting device of claim 11, wherein the heat sink comprises:

a first heat radiation part on which the light source module is disposed; and

a second heat radiation part which receives the first heat radiation part and is coupled to the second cover part,

wherein the second heat radiation part has a predetermined optical transmittance.

16. The lighting device of claim 15,

wherein the first heat radiation part comprises an upper portion including a top surface, a lower portion connected to the upper portion, and a receiver,

wherein the second heat radiation part comprises an inner portion disposed in the receiver of the first heat radiation part, and an outer portion which encloses the first heat radiation part and has an outer circumferential portion, and

wherein a thermal conductivity of the first heat radiation part is greater than a thermal conductivity of the second heat radiation part.

17. The lighting device of claim 16, further comprising a power supply unit supplying power to the light source module, wherein the first heat radiation part is formed of a non-insulating material, and the second heat radiation part is formed of an insulating material, and wherein the second heat radiation part comprises a receiver receiving the power supply unit.

18. The lighting device of claim 17,

wherein the power supply unit comprises a support plate and a plurality of parts disposed on the support plate, and

wherein the support plate comprises an extension part which passes sequentially through the inner portion of the second heat radiation part, the upper portion of the first heat radiation part, and the substrate, and is electrically connected to the substrate.

19. The lighting device of claim 17,

wherein the power supply unit comprises a support plate and a plurality of parts disposed on the support plate,

wherein the second heat radiation part further comprises a connection portion which allows the second heat radiation part to be connected to a base,

wherein the connection portion has at least one hole, and

wherein the support plate has a protrusion which has a hook structure and is inserted into the hole of the connection portion.

20. The lighting device of claim 17,

wherein the power supply unit comprises a support plate and a plurality of parts disposed on the support plate,

wherein the second heat radiation part comprises a first guide and a second guide which are disposed in the receiver of the second heat radiation part and guide both sides of one edge of the support plate, and

wherein an interval between the first guide and the second guide is reduced toward a bottom surface of the receiver of the second heat radiation part from an entrance of the receiver of the second heat radiation part.