LED lighting device which has stable structure and is easily assembled and disassembled

• US 8,827,525 B2
• Filed: 02/28/2012
• Issued: 09/09/2014
• Est. Priority Date: 03/02/2011
• Status: Active Grant

• Current Assignee: Suzhou Lekin Semiconductor Company Limited
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: Kim, Han Gyoul, Kim, Hwa Young, Kang, II Yeong, Kim, Jin Wook
• Primary Examiner(s): Ward, John A
• Application Number:
  US13/406,817
• Publication Number:
  US 20120224391A1
• Time in Patent Office: 924 Days
• Field of Search: 362/608, 362/609, 362/612, 362/613, 362/615, 362/617, 362/632, 362/633
• US Class Current: 362/609
• CPC Class Codes: F21K 9/20 Light sources comprising attachment means
• CPC Class Codes: F21K 9/61 using light guides
• CPC Class Codes: F21K 9/68 Details of reflectors forming part of the light source
• 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: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G02B 6/0031 Reflecting element, sheet or layer
• CPC Class Codes: G02B 6/0035 provided on the surface of the light guide or in the bulk of it
• CPC Class Codes: G02B 6/0036 2-D arrangement of prisms, protrusions, indentations or roughened surfaces
• CPC Class Codes: G02B 6/0055 Reflecting element, sheet or layer
• CPC Class Codes: G02B 6/0061 to provide homogeneous light output intensity
• CPC Class Codes: G02B 6/0083 Details of electrical connections of light sources to drivers, circuit boards, or the like
• CPC Class Codes: G02B 6/0088 of the light guide or other optical sheets in the package
• CPC Class Codes: G02B 6/0091 of the light source relative to the light guide G02B6/0021 takes precedence

Abstract

Disclosed is an LED lighting device which is easily assembled and disassembled and has a stable assemblability without structural shaking. The LED lighting device is able to improve a heat radiating characteristic and optical efficiency. The LED lighting device according to the embodiment includes a lower case; a light source unit disposed on one side of the lower case; a light guide plate disposed in parallel with the light source unit; and an upper case disposed on the light guide plate and coupled to the lower case in an attachable and removable way.

Claims

1. An LED lighting device comprising:

a light guide plate including a top surface, a bottom surface and a side surface;

an upper case including;

a base disposed on the top surface of the light guide plate, and

an edge extending from the base in parallel with the top surface of the light guide plate;

a lower case coupled to the upper case and including a body, wherein the body includes a first plane at the side surface of the light guide plate and a second plane on which the edge of the upper case is disposed;

a reflective sheet disposed between the top surface of the light guide plate and the base of the upper case; and

a light source unit disposed on the first plane of the body of the lower case.

2. The LED lighting device of claim 1, wherein the second plane of the body of the lower case is perpendicular to the first plane of the body of the lower case.

3. The LED lighting device of claim 1, further comprising a driver for driving the light source unit,

wherein the light source unit includes:

a substrate;

a light emitting device disposed on a first side surface of the substrate; and

a driving driver disposed on a second side surface of the substrate and being electrically connected to the driver,

wherein the body of the lower case has an insertion groove in which the driver and an opening is disposed.

4. The LED lighting device of claim 1, wherein the body of the lower case comprises a recess disposed at an outer surface of the body.

5. The LED lighting device of claim 4, further comprising a louver that adjusts a light direction is inserted and set in the guide recess, and wherein the louver is formed symmetrical or asymmetrical with respect to an opening of the lower case in accordance with an orientation angle of light that is emitted from the light guide plate.

6. The LED lighting device of claim 5, wherein the louver has a portion of the light irradiation direction formed in the form of a curve, a flat plane or a structure including the curve and the flat plane.

7. The LED lighting device of claim 5, wherein the louver is made of a plastic material or a metallic material, and wherein an inner surface of the louver is coated with a reflective material.

8. The LED lighting device of claim 1,

wherein the light source unit includes a substrate and a light emitting device disposed on one side surface of the substrate, and

wherein, the edge of the upper case has a locking recess into which the substrate is inserted is formed in a longitudinal direction of the edge.

9. The LED lighting device of claim 1, wherein the top surface of the light guide plate comprises a pattern having a roughness.

10. The LED lighting device of claim 1, wherein the top surface of the light guide plate comprises locally or entirely a shape of a plurality of lenses.

11. The LED lighting device of claim 1, further comprising a cap that is coupled to the side of the lower case and prevents light from being emitted from the side of the light guide plate,

wherein the cap includes a coupling hole that is coupled to a side of the guide recess of the lower case by a screw.

12. The LED lighting device of claim 1, wherein the base of the upper case is formed thicker than the edge of the upper case.

13. The LED lighting device of claim 1, wherein the lower case comprises a guide extending upwardly from the second plane.

14. An LED lighting device comprising:

a light guide plate including a top surface, a bottom surface and a side surface;

a lower case including a body, wherein the body includes a first plane disposed at the side surface of the light guide plate and a second plane in parallel with the top surface of the light guide plate;

an upper case including;

a body disposed on the top surface of the light guide plate, and

an edge extending from the base in parallel with the top surface of the light guide plate and disposed on the second plane of the lower case; and

a light source unit disposed between the side surface of the light guide plate and the first plane of the body of the lower case.

15. The LED lighting device of claim 14, wherein the bottom surface of the light guide plate has a level difference surface, and wherein the lower case comprises a bezel extending perpendicular to the first plane and on which the level difference surface of the light guide plate is disposed.

16. The LED lighting device of claim 15, further comprising a coating film that has a roughness and is disposed on the top surface of the light guide plate,

wherein the light guide plate comprises an effective area (AD) which light is emitted and an ineffective area (NAD) disposed on the bezel of the lower case, and

wherein a roughness of the coating film formed in the effective area (AD) is greater than a roughness of the coating film formed in the ineffective area (NAD).

17. The LED lighting device of claim 15, wherein the top surface of the light guide plate comprises a pattern having a roughness,

wherein the light guide plate comprises an effective area (AD) which light is emitted and an ineffective area (NAD) disposed on the bezel of the lower case, and

wherein a roughness of the pattern formed in the effective area (AD) is greater than a roughness of the pattern formed in the ineffective area (NAD).

18. The LED lighting device of claim 15, further comprising a reflective sheet disposed between the level difference surface of the light guide plate and the bezel of the lower case.

19. The LED lighting device of claim 15, wherein a bottom surface of the bezel and the bottom surface of the light guide plate are disposed on a same plane.

20. The LED lighting device of claim 15, wherein the top surface of the light guide plate comprises a plurality of lenses,

wherein the light guide plate comprises an effective area (AD) which light is emitted and an ineffective area (NAD) disposed on the bezel of the lower case, and

wherein a distance between the lenses formed in the effective area (AD) is less than a distance between the lenses formed in the ineffective area (NAD).