Downwardly directing spatial lighting system

• US 10,612,752 B2
• Filed: 03/15/2018
• Issued: 04/07/2020
• Est. Priority Date: 03/15/2013
• Status: Active Grant

• Current Assignee: Kenall Manufacturing Company (Legrand SA)
• Original Assignee: Kenall Manufacturing Company (Legrand SA)
• Inventors: Stolte, Brandon, Mui, Yanwai
• Primary Examiner(s): Kryukova, Erin
• Application Number:
  US15/922,316
• Publication Number:
  US 20180202630A1
• Time in Patent Office: 754 Days
• CPC Class Codes: F21S 8/086 with lighting device attached sideways of the standard, e.g. for roads and highways
• CPC Class Codes: F21V 13/04 the elements being reflectors and refractors for vehicle rear lights F21S43/40
• CPC Class Codes: F21V 3/00 Globes; Bowls; Cover glasses with refracting properties F21V5/00; with reflecting properties F21V7/00; characterised by cooling arrangements F21V29/506
• CPC Class Codes: F21V 5/007 Array of lenses or refractors for a cluster of light sources, e.g. for arrangement of multiple light sources in one plane combination of two or more refractors F21V5/008
• CPC Class Codes: F21V 5/08 producing an asymmetric light distribution
• CPC Class Codes: F21V 7/28 characterised by coatings
• CPC Class Codes: F21W 2131/103 of streets or roads
• CPC Class Codes: F21Y 2105/10 comprising a two-dimensional array of point-like light-generating elements
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

A luminaire that includes a plurality of light emitting diodes (LEDs), a light diffuser having a planar surface facing the LEDs, and a reflector that surrounds a cavity formed between the light diffuser and the LEDs. Also disclosed is a method of distributing light that involves emitting light towards a light diffuser having a planar surface having a reflective coating, scattering a first portion of the light with the light diffuser, reflecting a second portion of the light with the light diffuser, reflecting the second portion of the light with a first reflective surface back towards the light diffuser, and scattering the second portion of the light with the light diffuser. Further disclosed is another method of distributing light that involves emitting light toward a light diffuser and reflecting a portion of the emitted light toward the light diffuser via a reflector.

Claims

1. A luminaire comprising:

a plurality of light emitting diodes (LEDs) disposed on a mount surface;

a light diffuser spaced apart from the plurality of LEDs and including a planar surface facing the plurality of LEDs;

a reflector surrounding a cavity formed between the light diffuser and the plurality of LEDs, the plurality of LEDs emitting light away from the mount surface toward the planar surface of the light diffuser, whereat a first portion of the emitted light transmits through the light diffuser and a second portion reflects off of the planar surface of the light diffuser to the reflector;

a first plurality of lenses disposed on the mount surface, each of the first plurality of lenses having a central surface and an outer surface adjacent to the central surface being configured to convert light emitted from one of the plurality of LEDs into a first light intensity distribution pattern; and

a second plurality of lenses disposed on the mount surface and arranged around a periphery of the first plurality of lenses, each of the second plurality of lenses having a central surface, a first outer surface adjacent to the central surface, and a second outer surface adjacent to the first outer surface being configured to convert light emitted from one of the plurality of LEDs into a second light intensity distribution pattern, the second light intensity distribution pattern being different from the first light intensity distribution pattern.

2. The luminaire of claim 1, wherein the first light intensity distribution pattern comprises a peak of light intensity along a conical plane centered about a central axis of a respective one of the first plurality of lenses.

3. The luminaire of claim 2, wherein the second light intensity distribution pattern comprises:

(i) a first peak of light intensity along a first conical plane centered about a central axis of a respective one of the second plurality of lenses, and (ii) a second peak of light intensity along a second conical plane centered about the central axis of the respective one of the second plurality of lenses.

4. The luminaire of claim 3, wherein the second light intensity distribution pattern comprises a third peak of light intensity disposed radially between the first and second peaks of light intensity, the third peak of light intensity being less than the first peak of light intensity and less than the second peak of light intensity.

5. The luminaire of claim 4, wherein the central axis of the respective one of the first plurality of lenses and the central axis of the respective one of the second plurality of lenses are parallel to each other.

6. The luminaire of claim 1, wherein the reflector comprises:

(i) a circumferential reflecting surface, and (ii) a planar reflecting surface facing the planar surface of the light diffuser.

7. A method of distributing light, the method comprising:

emitting light from a first light source towards an upwardly facing planar surface of a light diffuser in a first light intensity distribution pattern such that the emitted light is directly incident upon the upwardly facing planar surface;

emitting light from a second light source towards the upwardly facing planar surface of the light diffuser in a second light intensity distribution pattern different than the first light intensity distribution pattern such that the emitted light is directly incident upon the upwardly facing planar surface,

the upwardly facing planar surface comprising a reflective material coating, such that the emitted light from the first light source and second light source that is directly incident upon the upwardly facing planar surface is directly incident upon the reflective material coating of the upwardly facing planar surface;

scattering a first portion of the light from the first light source and the second light source with the light diffuser, and reflecting a second portion of the light from the first light source and the second light source with the light diffuser;

reflecting the second portion of the light from the first light source and the second light source with a first reflective surface back towards the light diffuser;

reflecting the second portion of the light with a second reflective surface prior to reflecting the second portion of the light with the first reflective surface; and

scattering the second portion of the light from the first light source and the second light source with the light diffuser.

8. The method of claim 7, wherein the first and the second light sources comprise respective pluralities of light emitting diodes (LEDs).

9. A method of distributing light, the method comprising:

emitting light from a plurality of light sources toward a plurality of lenses, each of the light sources being aligned with a respective one of the plurality of lenses;

converting a first portion of the emitted light into a first light intensity distribution pattern via a first portion of the plurality of lenses, the first light intensity distribution pattern directed toward a light diffuser spaced apart from the plurality of lenses,

converting a second portion of the emitted light into a second light intensity distribution pattern via a second portion of the plurality of lenses, the second light intensity distribution pattern comprising a first bundle of light rays directed toward the light diffuser and a second bundle of light rays directed toward a reflector surrounding a cavity formed between the light diffuser and the plurality of lenses;

reflecting the second bundle of light rays with the reflector, the reflected light rays from the second bundle reflected toward the light diffuser; and

scattering, with the light diffuser, at least a portion of each of (i) the light from the first light intensity distribution pattern, (ii) the light from the first bundle of light rays from the second light intensity distribution pattern, and (iii) the reflected light from the second bundle of light rays from the second light intensity distribution pattern.

10. The method of claim 9, wherein each of the plurality of light sources is mounted on a mount surface.

11. The method of claim 9, wherein each of the plurality of light sources comprises a light emitting diode (LED).

12. The method of claim 9, wherein the light diffuser comprises a planar surface facing the plurality of lenses, such that light scattered with the light diffuser is light that is (i) incident to the light diffuser at the planar surface and (ii) scattered by the light diffuser upon being incident to the light diffuser at the planar surface.

13. The method of claim 12, wherein the light diffuser further comprises a downwardly facing textured surface opposite the planar surface.

14. The method of claim 9, wherein the first light intensity distribution pattern comprises a peak of light intensity along a conical plane centered about a central axis of a respective one of the first portion of the plurality of lenses.

15. The method of claim 9, wherein the first bundle of light rays corresponds to a first peak of light intensity from the second light intensity distribution pattern, the first peak being along a first conical plane centered about a central axis of a respective one of the second portion of the plurality of lenses, and

wherein the second bundle of light rays corresponds to a second peak of light intensity from the second light intensity distribution pattern, the second peak being along a second conical plane centered about the central axis of the respective one of the second portion of the plurality of lenses.

16. The method of claim 9, wherein each of the first portion of the plurality of lenses comprises a central surface and an outer surface adjacent to the central surface to convert the first portion of the emitted light into the first light intensity distribution pattern, and wherein each of the second portion of the plurality of lenses comprises a central surface, a first outer surface adjacent to the central surface, and a second outer surface adjacent to the first outer surface to convert the second portion of the emitted light into the second light intensity distribution pattern.

17. The method of claim 9, wherein the second portion of the plurality of lenses are arranged around a periphery of the first portion of the plurality of lenses.