LED lighting apparatus including reflector and heat radiating body

• US 8,192,049 B2
• Filed: 03/04/2011
• Issued: 06/05/2012
• Est. Priority Date: 04/10/2010
• Status: Active Grant

• Current Assignee: Suzhou Lekin Semiconductor Company Limited
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: Hyun, Ji Yeon, Kong, Kyung-il, Kang, Seok Jin, Kim, Eunhwa
• Primary Examiner(s): Negron, Ismael
• Application Number:
  US13/040,418
• Publication Number:
  US 20110205726A1
• Time in Patent Office: 459 Days
• Field of Search: 362/612, 362/613, 362/555, 362/511, 362/545, 362/236, 362/241, 362/20, 362/249.02, 362/249.06, 362/298, 362/294, 362/373
• US Class Current: 362/241
• CPC Class Codes: F21S 8/02 of recess-mounted type, e.g. downlighters specially adapted for vehicle exteriors F21S41/00-F21S45/00
• CPC Class Codes: F21V 15/01 Housings, e.g. material or assembling of housing parts F21V15/02 takes precedence housings forming signs or letters G09F13/04
• CPC Class Codes: F21V 19/0045 by tongue and groove connections, e.g. dovetail interlocking means fixed by sliding
• CPC Class Codes: F21V 29/507 of means for protecting lighting devices from damage, e.g. housings
• CPC Class Codes: F21V 29/75 with fins or blades having different shapes, thicknesses or spacing
• CPC Class Codes: F21V 29/763 the planes containing the fins or blades having the direction of the light emitting axis
• 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 7/05 plane
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

The lighting apparatus includes a first light emitting diode (LED) module, a second LED module and a reflector. The first LED module includes a first plurality of LEDs disposed on one side of a first substrate. The second LED module includes a second plurality of LEDs disposed on one side of a second substrate. The reflector is disposed between the first LED module and the second LED module and may reflect in a light emission direction light emitted from the plurality of the LEDs. Additionally, when the light emitted from the plurality of the LEDs is reflected by a reflective surface of the reflector, and is projected to a plane, images of outermost light sources are distributed on the plane to substantially have a circular shape.

Claims

1. A lighting apparatus comprising:

a heat radiating body having a first heat radiating body, a second heat radiating body and a housing space inside the heat radiating body, and the housing space is defined by four inner walls and a top surface wall;

a first substrate on which a first plurality of light emitting diodes (LEDs) are disposed in two lines on one side of the first substrate, the first LED module provided on a first one of the four inner walls of the first heat radiating body;

a second substrate being disposed apart from the first substrate at a distance and including a second plurality of LEDs disposed in two lines on one side of the second substrate, the second LED module provided on a second one of the four inner walls of the second heat radiating body;

a reflector being disposed between the first substrate and the second substrate, the reflector including a first surface that is inclined with respect to the one side of the first substrate and a second surface that is inclined with respect to the one side of the second substrate, the reflector to receive light from the first and second plurality of LEDs and to reflect the light in a light emission direction away from the top surface wall of the housing space and to outside of an opening of the heat radiating body, the reflector including a first locking part and a second locking part, and the first locking part and the second locking part to prevent the reflector from moving in the light emission direction away from the top surface wall of the housing space; and

wherein the first LED module, the second LED module and the reflector are provided within the heat radiating body, wherein the light from the first plurality of LEDs is reflected by the first surface of the reflector in the light emission direction away from the top surface of the housing space and the light from the second plurality of LEDs is reflected by the second surface of the reflector in the light emission direction away from the top surface of the housing space.

2. The lighting apparatus of claim 1, wherein the first substrate and the second substrate are disposed to face each other.

3. The lighting apparatus of claim 1, wherein, when the first plurality of LEDs are disposed in two lines, a first number of LEDs disposed in one line is different from a second number of LEDs disposed in the other line.

4. The lighting apparatus of claim 1, wherein the first heat radiating body has a first plurality of heat radiating fins, and the second heat radiating body has a second plurality of heat radiating fins.

5. The lighting apparatus of claim 1, wherein the reflector changes a path of light emitted from the first plurality of LEDs and changes a path of light emitted from the second plurality of LEDs.

6. The lighting apparatus of claim 5, further comprising an optic plate for condensing or diffusing light having the path changed by the reflector.

7. A lighting apparatus comprising:

a heat radiating body having a first heat radiating body and a second heat radiating body, the heat radiating body having a cylindrical shape and a housing space inside the heat radiating body has a hexahedral shape, the housing space including four inner walls, a top surface wall and an opening;

a first light emitting diode (LED) module that includes a first substrate, a first projection and a first plurality of LEDs disposed on one side of the first substrate, the first LED module provided on a first one of the four inner walls of the first heat radiating body;

a second LED module that includes a second substrate different than the first substrate, a second projection and a second plurality of LEDs disposed on one side of the second substrate, wherein the one side of the second substrate is disposed apart from the one side of the first substrate, the second LED module provided on a second one of the four inner walls of the second heat radiating body;

a reflector being disposed between the first LED module and the second LED module to receive light from the first and second plurality of LEDs and to reflect the light in a light emission direction away from the top surface wall of the housing space and to outside of the opening of the housing space, the reflector including a first locking part to receive the first projection and a second locking part to receive the second projection, and the first locking part and the second locking part to prevent the reflector from moving in the light emission direction away from the top surface wall of the housing space, the reflector including a first reflector surface and a second reflector surface different than the first reflector surface, the first reflector surface being inclined with respect to the one side of the first substrate, and the second reflector surface being inclined with respect to the one side of the second substrate, and

wherein the first LED module, the second LED module and the reflector are provided within the heat radiating body,

wherein when the light emitted from the first plurality of LEDs is reflected by the first reflective surface of the reflector in the light emission direction away from the top surface of the housing space and the light emitted from the second plurality of LEDs is reflected by the second reflective surface of the reflector in the light emission direction away from the top surface of the housing space, and is projected to a plane, images of outermost light sources are distributed on the plane to substantially have a circular shape.

8. The lighting apparatus of claim 7, wherein an end of the first reflector surface contacts an end of the second reflector surface at a predetermined angle.

9. The lighting apparatus of claim 7, wherein the lights emitted from the first plurality of LEDs of the first LED module and the second plurality of LEDs of the second LED module form images symmetrical to each other with respect to a central axis of the reflector.

10. The lighting apparatus of claim 7, wherein the first plurality of LEDs on the first substrate are disposed at a regular interval, and the second plurality of LEDs on the second substrate are disposed at a regular interval.

11. The lighting apparatus of claim 7, wherein the first heat radiating body has a first plurality of heat radiating fins, and the second heat radiating body has a second plurality of heat radiating fins.

12. The lighting apparatus of claim 7, wherein the first plurality of LEDs are disposed in at least two lines on the one side of the first substrate, and the second plurality of LEDs are disposed in at least two lines on the one side of the second substrate.

13. The lighting apparatus of claim 12, wherein, when the first plurality of LEDs are disposed in two lines, a first number of LEDs disposed in one line is different from a second number of LEDs disposed in the other line.

14. The lighting apparatus of claim 7, further comprising an optic plate condensing or diffusing the light reflected by the first and second reflector surfaces of the reflector.

15. The lighting apparatus of claim 14, wherein the optic plate comprises:

an optic sheet converging or diffusing the light incident on one side thereof;

a glass plate disposed on the other side of the optic sheet; and

a frame surrounding the glass plate.

16. The lighting apparatus of claim 7, further comprising a first plurality of collimating lenses disposed on the one side of the first substrate and to surround the first plurality of LEDs and collimate light emitted from the first plurality of LEDs into the first reflector surface of the reflector, and a second plurality of collimating lenses disposed on the one side of the second substrate and to surround the second plurality of LEDs and collimate light emitted from the second plurality of LEDs into the second reflector surface of the reflector.

17. The lighting apparatus of claim 16, further comprising a first plurality of holders to surround the first plurality of collimating lenses and to support the first plurality of collimating lenses, and a second plurality of holders to surround the second plurality of collimating lenses and to support the second plurality of collimating lenses.

18. The lighting apparatus of claim 16, wherein each of the collimating lenses comprises a fluorescent material.

19. The lighting apparatus of claim 16, wherein each of the collimating lenses comprises a groove for receiving the corresponding LEDs.