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

Patent metadata

Field	Value
Publication number	US-9546761-B2
Application number	US-201414447969-A
Country	US
Kind code	B2
Filing date	Jul 31, 2014
Priority date	Mar 2, 2011
Publication date	Jan 17, 2017
Grant date	Jan 17, 2017

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 comprises a light guide plate comprising a top surface; an upper case comprising a base disposed on the top surface of the light guide plate, and an edge extending from the base, wherein the base is thicker than the edge; a lower case comprising a body coupled to the edge of the upper case; 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 between the light guide plate and the body of the lower case.

First claim

What is claimed is:

1. An LED lighting device comprising:
a light guide plate comprising a top surface;
an upper case comprising a base disposed on the top surface of the light guide plate, and an edge extending from the base;
a lower case disposed on both ends of the light guide plate, and the lower case including a body coupled to the edge of the upper case and an extension part extending from the body, wherein the extension part supports the light guide plate;
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 between the light guide plate and the body of the lower case,
wherein the light source unit includes a substrate and a plurality of light emitting devices disposed on the substrate,
wherein the substrate is disposed between the edge of the upper case and the extension part of the lower case,
wherein the edge of the upper case includes a portion on which a side of the substrate is disposed, and
wherein a thickness of the portion of the edge of the upper case is thinner than the base of the upper case.

2. The LED lighting device of claim 1 , wherein the portion of the edge of the upper case has a locking recess, and
wherein the side of the substrate of the light source unit is inserted into the locking recess.

3. The LED lighting device of claim 1 , wherein the lower case includes a guide disposed on the body of the lower case, and
wherein the guide guides the edge of the upper case in order to prevent the upper case from moving right and left.

4. The LED lighting device of claim 3 , wherein a height of the guide is the same as a thickness of the edge of the upper case.

5. The LED lighting device of claim 1 , wherein the lower case has a recess.

6. The LED lighting device of claim 1 , wherein each of the base and the edge includes a top surface,
wherein the light guide plate includes a bottom surface,
wherein the body of the lower case includes a bottom surface, and
wherein a distance from the top surface of the base to the bottom surface of the light guide plate is equal to or greater than a distance from the top surface of the edge of the upper case to the bottom surface of the body.

7. An LED lighting device comprising:
a light guide plate comprising a top surface, a side surface, a bottom surface and a level difference surface disposed between the side surface and the bottom surface;
a lower case comprising:
a body disposed on the side surface of the light guide plate; and
an extension part extending from the body, disposed on the level difference surface and supporting the light guide plate,

an upper case disposed on the light guide plate and coupled to the body of the lower case; and
a light source unit disposed between the body of the lower case and the side surface of the light guide plate,
wherein the extension part of the lower case includes a bottom surface, and
wherein the bottom surface of the extension part and the bottom surface of the light guide plate are disposed on a same plane.

8. The LED lighting device of claim 7 , wherein the top surface of the light guide plate comprises a pattern having a roughness.

9. The LED lighting device of claim 7 , wherein the top surface of the light guide plate comprises locally or entirely a shape of a plurality of lenses.

10. The LED lighting device of claim 7 , 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 extension part 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).

11. The LED lighting device of claim 7 , 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 extension part 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).

12. The LED lighting device of claim 7 , 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 extension part 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).

13. The LED lighting device of claim 7 , wherein the lower case includes a guide disposed on the body of the lower case, and wherein the guide guides the upper case in order to prevent the upper case from moving right and left.

14. The LED lighting device of claim 7 , wherein the upper case comprises a base disposed on the light guide plate and an edge extending from the base in parallel with the top surface of the light guide plate.

15. An LED lighting device comprising:
a light guide plate comprising a top surface, a side surface, a bottom surface and a level difference surface disposed between the side surface and the bottom surface;
a lower case comprising:
a body disposed on the side surface of the light guide plate; and
an extension part extending from the body, disposed on the level difference surface and supporting the light guide plate,

an upper case disposed on the light guide plate and coupled to the body of the lower case;
a light source unit disposed between the body of the lower case and the side surface of the light guide plate; and
a reflective sheet disposed between the extension part of the lower case and the level difference surface of the light guide plate.

16. An LED lighting device comprising:
a light guide plate comprising a top surface, a side surface, a bottom surface and a level difference surface disposed between the side surface and the bottom surface;
a lower case comprising:
a body disposed on the side surface of the light guide plate; and
an extension part extending from the body, disposed on the level difference surface and supporting the light guide plate,

an upper case disposed on the light guide plate and coupled to the body of the lower case; and
a light source unit disposed between the body of the lower case and the side surface of the light guide plate,
wherein the lower case includes a guide disposed on the body of the lower case, and
wherein the guide guides the upper case in order to prevent the upper case from moving right and left.

17. An LED lighting device comprising:
a light guide plate comprising a top surface, a side surface, a bottom surface and a level difference surface disposed between the side surface and the bottom surface;
a lower case comprising:
a body disposed on the side surface of the light guide plate; and
an extension part extending from the body, disposed on the level difference surface and supporting the light guide plate,

an upper case disposed on the light guide plate and coupled to the body of the lower case;
a light source unit disposed between the body of the lower case and the side surface of the light guide plate; and
a reflective sheet disposed between the light guide plate and the upper case.

18. An LED lighting device comprising:
a light guide plate;
a body comprising a first

Assignees

• Lg Innotek Co Ltd

Inventors

• Kim Han Gyoul
• Kim Hwa Young
• Kang Il Yeong
• Kim Jin Wook

Classifications

• F21K9/68

  Details of reflectors forming part of the light source · CPC title

• F21K9/61

  using light guides · CPC title

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title

• G02B6/0083

  Details of electrical connections of light sources to drivers, circuit boards, or the like · CPC title

• F21K9/20 Primary

  Light sources comprising attachment means · CPC title