Lighting device having a plurality of light sources and a light guide

Patent metadata

Field	Value
Publication number	US-10895362-B2
Application number	US-201816646198-A
Country	US
Kind code	B2
Filing date	Sep 13, 2018
Priority date	Sep 20, 2017
Publication date	Jan 19, 2021
Grant date	Jan 19, 2021

Abstract

A lighting device may include a plurality of light sources which are disposed on the circumference of a concentric circle, a light guide which surrounds the light sources and is disposed adjacent to the light sources, and a cover member which surrounds the upper surfaces of the light sources and the upper and side surfaces of the light guide. The light guide has a first surface in the light source direction and a second surface in a direction opposite to the light source which have an inclination with respect to the optical axis of the light emitted from the light sources. The cover member has a light transmitting pattern in a light diffusion region facing the upper surface of the light guide.

First claim

The invention claimed is:

1. A lighting device comprising:
a plurality of light sources disposed at a circumference of a concentric circle;
a light guide disposed adjacent to the light sources while surrounding the light sources; and
a cover member configured to surround upper surfaces of the light sources and upper and side surfaces of the light guide,
wherein the light guide is configured such that a first surface thereof in a direction of the light sources and a second surface thereof in a direction opposite to the light sources have inclinations with respect to an optical axis of light emitted from the light sources, respectively, and the cover member has a light-transmissive pattern in a light diffusion area thereof facing the upper surface of the light guide,
the light guide is provided with a plurality of grooves at a central first area thereof such that the plural light sources are inserted into the grooves, respectively, and
wherein shapes of the plurality of grooves are identical in point symmetry with respect to a center of the concentric circle.

2. The lighting device according to claim 1 , wherein light exit surfaces of the plural light sources are disposed in a direction opposite to the center of the concentric circle.

3. The lighting device according to claim 1 , wherein:
optical axes of light beams respectively emitted from the plural light sources are arranged to extend from a center of the concentric circle; and
angles formed by the optical axes of the light beams emitted from adjacent ones of the light sources are equal.

4. The lighting device according to claim 1 , wherein:
each of the grooves has a horizontal cross-section having at least four sides; and
each of the grooves comprises a first surface in a light exit surface direction of the corresponding light source, a second surface facing the first surface, and third and fourth surfaces between the first surface and the second surface.

5. The lighting device according to claim 4 , wherein an inclination of a light incidence surface of the light guide with respect to the optical axis of light emitted from the light sources is equal to an inclination of a light exit surface of the light guide with respect to the optical axis of light emitted from the light sources.

6. The lighting device according to claim 1 , wherein:
a first angle, at which a light incidence surface of the light guide is inclined with respect to the optical axis of light emitted from the light sources, is 40 to 50′; and
a second angle, at which a light exit surface of the light guide is inclined with respect to the optical axis of light emitted from the light sources, is 130 to 140°.

7. The lighting device according to claim 4 , wherein the light-transmissive pattern of the cover member is disposed over optical axes of light beams emitted from the plural light sources.

8. The lighting device according to claim 4 , wherein the cover member further comprises light shields respectively disposed in an inner area inside the light-transmissive pattern and an outer area outside the light-transmissive pattern, and the inner area has a greater thickness than the light diffusion area.

9. The lighting device according to claim 4 , wherein the light guide is provided with a first pattern at a lower surface thereof.

10. The lighting device according to claim 4 , wherein the light guide and the cover member are spaced apart from each other, and an air guide is formed in a space area between the light guide and the cover member.

11. A lighting device comprising:
a plurality of light sources disposed at a circumference of a concentric circle;
a light guide disposed adjacent to the light sources while surrounding the light sources; and
a cover member configured to surround upper surfaces of the light sources and upper and side surfaces of the light guide,
wherein the cover member has an inner side facing the light guide inclined with respect to optical axes of the light emitted from the plurality of light sources.

12. The lighting device according to claim 11 , wherein the light guide is configured such that a first surface thereof in a direction of the light sources and a second surface thereof in a direction opposite to the light sources are perpendicular to an optical axis of light emitted from the light sources, respectively.

13. The lighting device according to claim 11 , wherein the cover member has a light-transmissive pattern in a light diffusion area thereof facing the upper surface of the light guide.

14. The lighting device according to claim 11 , wherein light exit surfaces of the plural light sources are disposed in a direction opposite to the center of the concentric circle.

15. The lighting device according to claim 11 , wherein optical axes of light beams respectively emitted from the plural light sources are arranged to extend from a center of the concentric circle.

16. The lighting device according to claim 11 , wherein angles formed by the optical axes of the light beams emitted from adjacent ones of the light sources are equal.

17. A lighting device comprising:
a plurality of light sources disposed at a circumference of a concentric circle;
a light guide disposed adjacent to the light sources while surrounding the light sources; and
a cover member configured to surround upper surfaces of the light sources and upper and side surfaces of the light guide,
wherein the light guide is configured such that a first surface thereof in a direction of the light sources and a second surface thereof in a direction opposite to the light sources have inclinations with respect to an optical axis of light emitted from the light sources, respectively, and the cover member has a light-transmissive pattern in a light diffusion area thereof facing the upper surface of the light guide,
the light guide is provided with a plurality of grooves at a central first area thereof such that the plural light sources are inserted into the grooves, respectively,
wherein shapes of the plurality of grooves are identical in point symmetry with respect to a center of the concentric circle,
wherein light exit surfaces of the plural light sources are disposed in a direction opposite to the center of the concentric circle, and
wherein optical axes of light beams respectively emitted from the plural light sources are arranged to extend from a center of the concentric circle.

18. The lighting device according to claim 17 , wherein wherein angles formed by the optical axes of the light beams emitted from adjacent ones of the light sources are equal.

19. The lighting device according to claim 17 , wherein each of the grooves has a horizontal cross-section having at least four sides.

20. The lighting device according to claim 19 , wherein each of the grooves comprises a first surface in a light exit surface direction of the corresponding light source, a second surface facing the first surface, and third and fourth surfaces between the first surface and the second surface.

Assignees

• Lg Innotek Co Ltd

Inventors

• Lim Eay Jin
• Baek seung jong
• Han Kyu Sung

Classifications

• F21S41/00 Primary

  Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps (reversing lights F21S43/00) · CPC title

• F21S43/235

  Light guides · CPC title

• F21W2107/00

  Use or application of lighting devices on or in particular types of vehicles · CPC title

• F21S43/2492

  having two or more input branches · CPC title

• F21S43/246

  having two or more output branches · CPC title