Lighting apparatus

• US 9,581,320 B2
• Filed: 01/07/2015
• Issued: 02/28/2017
• Est. Priority Date: 06/25/2014
• Status: Expired due to Fees

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Ha, Jeongseok, Hong, Jaepyo, Chang, Hyeuk
• Primary Examiner(s): CARIASO, ALAN B
• Application Number:
  US14/591,725
• Publication Number:
  US 20150377473A1
• Time in Patent Office: 783 Days
• US Class Current: 1/1
• CPC Class Codes: F21K 9/00 Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
• 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 29/745 the fins or blades being planar and inclined with respect to the joining surface from which the fins or blades extend
• CPC Class Codes: F21V 29/77 with essentially identical diverging planar fins or blades, e.g. with fan-like or star-like cross-section
• CPC Class Codes: F21V 29/83 the elements having apertures, ducts or channels, e.g. heat radiation holes
• CPC Class Codes: F21V 29/85 characterised by the material liquid coolants F21V29/56
• CPC Class Codes: F21Y 2105/10 comprising a two-dimensional array of point-like light-generating elements
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

Provided is a lighting apparatus. The lighting apparatus includes one or more light-emitting modules; a base plate having a bottom surface to which the one or more light-emitting modules are attached; and a heat dissipation fin assembly seated on a top surface of the base plate, wherein the heat dissipation fin assembly includes a plurality of heat dissipation fins which are mounted upright on the top surface of the base plate, wherein each of the heat dissipation fins has a predetermined width in a radial direction from a center of the base plate, and is formed by a thin sheet of a graphite material.

Claims

1. A lighting apparatus comprising:

one or more light-emitting diode (LED) modules;

a base plate having a bottom surface to which the one or more light-emitting diode modules are attached; and

a heat dissipation fin assembly including a plurality of heat dissipation fins, the heat dissipation fin assembly being seated on a top surface of the base plate and formed by a thin sheet of a graphite material;

wherein the heat dissipation fin assembly has a structure in which a sheet of heat dissipation fin plate is bent several times in a zigzag shape to have a plurality of bent parts, and is disposed in a circumferential direction on the top surface of the base plate,

wherein the heat dissipation fin assembly is defined as an assembly of a plurality of fin parts which are partitioned by the plurality of bent parts,

wherein the plurality of bent parts comprise;

a plurality of inner bent parts disposed inside the base plate; and

a plurality of outer bent parts disposed on an outer edge of the base plate and alternately disposed with the plurality of inner bent parts in the circumferential direction of the base plate, and

wherein the heat dissipation fin assembly has;

an inner air-vent hole defined by cutting at least a portion of each of the plurality of inner bent parts; and

an outer air-vent hole defined by cutting at least a portion of each of the plurality of outer bent parts.

2. The lighting apparatus according to claim 1, wherein inner cutoff parts defining the inner air-vent hole are stepped once or several times so that an inner upper end of the heat dissipation fin is farther away from a central portion of the heat dissipation fin assembly than an inner lower end of the heat dissipation fin is away from the central portion of the heat dissipation fin assembly.

3. The lighting apparatus according to claim 1, wherein inner cutoff parts defining the inner air-vent hole are inclined or rounded so that an inner upper end of the heat dissipation fin is farther away from a central portion of the heat dissipation fin assembly than an inner lower end of the heat dissipation fin is away from a central portion of the heat dissipation fin assembly.

4. The lighting apparatus according to claim 2, further comprising a plurality of inner fins disposed inside the heat dissipation fin assembly,

wherein each of the plurality of inner fins is mounted upright on the top surface of the base plate and has a predetermined width in a radial direction from the center of the base plate, and

an outer end of each of the plurality of inner fins is disposed between the bent parts adjacent to each other.

5. The lighting apparatus according to claim 3, further comprising a plurality of inner fins disposed inside the heat dissipation fin assembly,

wherein each of the plurality of inner fins is mounted upright on the top surface of the base plate and has a predetermined width in a radial direction from the center of the base plate, and

an outer end of each of the plurality of inner fins is disposed between the bent parts adjacent to each other.

6. The lighting apparatus according to claim 1, wherein the heat dissipation fin assembly further comprises a heat dissipation plate to which a lower end of each of the plurality of heat dissipation fins is attached,

wherein the heat dissipation plate is seated on the top surface of the base plate.

7. The lighting apparatus according to claim 6, further comprising a spacer seated on a top surface of the heat dissipation plate.

8. The lighting apparatus according to claim 7, wherein the spacer comprises:

a frame part having a predetermined width, the frame part being disposed along an edge of the top surface of the base plate or the heat dissipation plate;

a plurality of horizontal ribs extending from an inner edge of the frame part toward a center of the frame part;

a plurality of vertical ribs extending upward from top surfaces of the plurality of horizontal ribs; and

a center part to which upper ends of the plurality of vertical ribs are concentrated.

9. The lighting apparatus according to claim 8, wherein the plurality of horizontal ribs are spaced a predetermined distance apart from each other in a circumferential direction to define a plurality of heat dissipation fin accommodation grooves,

wherein the plurality of heat dissipation fins are accommodated in the plurality of accommodation grooves, respectively.

10. The lighting apparatus according to claim 1, further comprising a spacer seated on the top surface of the base plate.

11. The lighting apparatus according to claim 10, wherein the spacer comprises:

a frame part having a predetermined width, the frame part being disposed along an edge of the top surface of the base plate or the heat dissipation plate;

a plurality of horizontal ribs extending from an inner edge of the frame part toward a center of the frame part;

a plurality of vertical ribs extending upward from top surfaces of the plurality of horizontal ribs; and

a center part to which upper ends of the plurality of vertical ribs are concentrated.

12. The lighting apparatus according to claim 11, wherein the plurality of horizontal ribs are spaced a predetermined distance apart from each other in a circumferential direction to define a plurality of heat dissipation fin accommodation grooves,

wherein the plurality of heat dissipation fins are accommodated in the plurality of accommodation grooves, respectively.

13. The lighting apparatus according to claim 1, further comprising an aluminum sheet attached to the plurality of heat dissipation fins,

wherein the aluminum sheet defines an outer surface of the heat dissipation fin assembly, and the graphite sheet defines an inner surface of the heat dissipation fin assembly.