LED LIGHTING DEVICE WHICH HAS STABLE STRUCTURE AND IS EASILY ASSEMBLED AND DISASSEMBLED

• US 20120224391A1
• Filed: 02/28/2012
• Published: 09/06/2012
• 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, Kim, Jin Wook, Kang, II Yeong
• Granted Patent: US 8,827,525 B2
• Time in Patent Office: Days
• 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 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.

2. The LED lighting device of claim 1, further comprising a reflective sheet disposed between the light guide plate and the upper case.

3. The LED lighting device of claim 1, wherein the lower case comprises:

a body including two planes which are formed perpendicular to each other;

a bezel formed extending perpendicular to one plane of the body; and

a guide formed projecting perpendicular to the other plane of the body.

4. The LED lighting device of claim 3, wherein, in the lower case, an insertion groove in which a driver of the light source unit is disposed is formed on one side of the body, and an opening is formed in such a manner that the insertion groove is connected to the plane on which the light source unit is disposed.

5. The LED lighting device of claim 3, wherein the lower case comprises a plurality of guide recesses formed inside the body under the guide in the longitudinal direction of the body.

6. The LED lighting device of claim 5, wherein a louver which 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 a case in accordance with an orientation angle of light which is emitted from the light guide plate.

7. The LED lighting device of claim 6, 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.

8. The LED lighting device of claim 6, 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.

9. The LED lighting device of claim 3, wherein, in the lower case, an effective area, that is, a light emitting area is determined by selectively setting a width or a size of the bezel, so that a light spot is prevented.

10. The LED lighting device of claim 3, further comprising a reflective sheet in the bezel of the lower case, to which the light guide plate is connected.

11. The LED lighting device of claim 1, wherein the upper case comprises:

a plate shaped base; and

an edge formed extending from both sides of the base and having a level difference,

which is stepped with respect to and extends from the base,

wherein an open access in which a driver of the light source is disposed is formed on both sides of the base.

12. The LED lighting device of claim 11, wherein, in the upper case, a locking recess into which the substrate of the light source unit is inserted is formed in the longitudinal direction of the edge on a junction between the base and the edge.

13. The LED lighting device of claim 1, wherein the light guide plate comprises a pattern formed on one side thereof or a coating film having a roughness.

14. The LED lighting device of claim 1, wherein one side of the light guide plate comprises locally or entirely a shape of a plurality of lenses.

15. The LED lighting device of claim 1, wherein the light source unit comprises:

a rectangular substrate;

a plurality of light emitting devices disposed on one side of the substrate in the longitudinal direction of the substrate; and

a driving driver driving the light emitting device.

16. The LED lighting device of claim 1, comprising a photo luminescent film disposed between the light source unit and the light guide plate, wherein the photo luminescent film includes a transparent resin and a fluorescent material, and wherein the transparent resin includes at least one of a curing agent, an additive and a diffusing agent.

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

18. The LED lighting device of claim 17, further comprising a heat radiation sheet or a thermal grease between the upper case and the lower case or between the light source unit and the lower case.

19. An LED lighting device comprising:

a light source unit;

a light guide plate disposed in parallel with the light source unit; and

a coating film which has a roughness and is disposed on the light guide plate.

20. The LED lighting device of claim 19, wherein the roughness of the coating film formed in an effective area where light is emitted through the light guide plate is different from the roughness of the coating film formed in an ineffective area where the light is not emitted.