Light source module

Patent metadata

Field	Value
Publication number	US-11774665-B2
Application number	US-202117908737-A
Country	US
Kind code	B2
Filing date	Mar 11, 2021
Priority date	Mar 12, 2020
Publication date	Oct 3, 2023
Grant date	Oct 3, 2023

Abstract

A light source module comprises: a printed circuit board; a light source disposed on the printed circuit board; a first light guide layer disposed on the printed circuit board, and accommodating the light source; and a second light guide layer disposed above the first light guide layer, wherein a material of the first light guide layer is different from that of the second light guide layer, and a refractive index of the first light guide layer is greater than that of the second light guide layer.

First claim

The invention claimed is:

1. A light source module comprising:
a printed circuit board;
a light source disposed on the printed circuit board;
a first light guide layer disposed on the printed circuit board, and accommodating the light source; and
a second light guide layer disposed on an outer surface of the first light guide layer, wherein the material of the first light guide layer is different from the material of the second light guide layer, and
wherein the refractive index of the first light guide layer is greater than the refractive index of the second light guide layer.

2. The light source module according to claim 1 ,
wherein the material of the first light guide layer includes silicon, and
wherein the material of the second light guide layer includes barium sulfate and resin.

3. The light source module according to claim 2 ,
wherein the composition ratio of the barium sulfate to the resin is 1:4.

4. The light source module according to claim 1 ,
wherein the thickness of the first light guide layer is greater than the thickness of the second light guide layer.

5. The light source module according to claim 1 ,
wherein the light source is a side view type light emitting diode.

6. The light source module according to claim 1 , including:
a light reflective layer being disposed on the printed circuit board and reflecting the light irradiated from the light source.

7. The light source module according to claim 1 ,
wherein the refractive index of the first light guide layer is 1.5 to 1.6 or less, and
wherein the refractive index of the second light guide layer is 1.4 to 1.5 or less.

8. The light source module according to claim 4 ,
wherein the thickness of the first light guide layer is 2 mm to 4 mm or less, and
wherein the thickness of the second light guide layer is 0.4 mm to 1.0 mm or less.

9. The light source module according to claim 8 ,
wherein based on the thickness of the first light guide layer, the thickness of the second light guide layer is 0.13 to 0.34 or less.

10. The light source module according to claim 9 ,
wherein based on the thickness of the first light guide layer, the thickness of the second light guide layer is 0.33 to 0.34 or less.

11. The light source module according to claim 1 , wherein the light source is a downward direction type light emitting diode.

12. The light source module according to claim 6 , wherein a hole for forming an arrangement area of the light source is formed in the light reflective layer.

13. The light source module according to claim 1 , wherein a light generated from the light source is irradiated at different angles from the first light guide layer and the second light guide layer, respectively.

14. The light source module according to claim 13 , wherein the light generated from the light source is irradiated at a lower angle in the second light guide layer than in the first light guide layer.

15. The light source module according to claim 6 , wherein a plurality of reflective patterns are disposed on the light reflective layer.

16. A light source module comprising:
a printed circuit board;
a light source being disposed on the printed circuit board;
a first light guide layer being disposed on the printed circuit board and accommodating the light source; and
a second light guide layer being disposed on an outer surface of the first light guide layer,
wherein the material of the first light guide layer is different from the material of the second light guide layer, and
wherein the thickness of the first light guide layer is greater than the thickness of the second light guide layer.

17. The light source module according to claim 16 ,
wherein the material of the first light guide layer includes silicon, and
wherein the material of the second light guide layer includes barium sulfate and resin.

18. The light source module according to claim 17 ,
wherein the composition ratio of the barium sulfate to the resin is 1:4.

19. The light source module according to claim 16 ,
wherein the light source is a side view type light emitting diode.

20. The light source module according to claim 16 , including:
a light reflective layer being disposed on the printed circuit board and reflecting the light irradiated from the light source.

Assignees

• Lg Innotek Co Ltd

Inventors

• Lim Eay Jin
• Kim Seong Jin

Classifications

• H10H29/142

  Two-dimensional arrangements, e.g. asymmetric LED layout · CPC title

• H10H20/855 Primary

  Optical field-shaping means, e.g. lenses · CPC title

• H10H20/854

  characterised by their material, e.g. epoxy or silicone resins · CPC title

• H10H20/856

  Reflecting means · CPC title

• H10H20/853

  characterised by their shape · CPC title