LED-based direct-view luminaire with uniform lit appearance

Patent metadata

Field	Value
Publication number	US-9279547-B2
Application number	US-201314371867-A
Country	US
Kind code	B2
Filing date	Jan 10, 2013
Priority date	Jan 13, 2012
Publication date	Mar 8, 2016
Grant date	Mar 8, 2016

Abstract

Disclosed are methods and apparatus related to an LED-based luminaire ( 10 ) that redirects substantially all light output from LEDs ( 40 ) thereof off of an interior reflective surface at least once prior to the light exiting the LED-based luminaire ( 10 ). In some embodiments, an LED-based luminaire ( 10 ) is provided that includes a housing having a light output opening ( 20 ), a reflective interior surface, a diffusing cover lens ( 30 ) across the light output opening ( 20 ), and a plurality of optics ( 50 ) that are configured to redirect light output from a plurality of LEDs ( 40 ) within the lighting fixture ( 10 ).

First claim

What is claimed is:

1. A LED lighting fixture, comprising:
a housing having a light output opening, a LED support area facing said light output opening, and a plurality of diffusely reflective walls extending between said LED support area and said light output opening;
a plurality of LEDs adjacent said LED support area, each of said LEDs selectively generating a LED light output having a component emitting directly toward said light output opening;
said LEDs including a first longitudinally extending row of LEDs and a second longitudinally extending row of LEDs in parallel relation to said first longitudinally extending row of LEDs, wherein said LEDs of said first longitudinally extending row of LEDs are positionally offset from said LEDs of said second longitudinally extending row of LEDs in a direction along the length of said first and second longitudinally extending rows;
a plurality of blocking optics, each of said blocking optics provided over a different, respective LED of said plurality of LEDs and below said output opening and redirecting at least said component of said LED light output of said respective LED toward at least one of said diffusely reflective walls, wherein at least one blocking optic of said plurality of blocking optics is configured to direct at least one other light component, of said LED light output of said respective LED, above an upper extent of said at least one blocking optic as said at least one other light component exits through a lateral surface of said at least one blocking optic; and
a diffusing cover lens provided across said light output opening.

2. The LED lighting fixture of claim 1 , wherein said diffusely reflective walls are rectangularly arranged.

3. The LED lighting fixture of claim 1 , wherein said LED support area is planar.

4. The LED lighting fixture of claim 3 , wherein said diffusely reflective walls are rectangularly arranged.

5. The LED lighting fixture of claim 4 , wherein said diffusing cover lens is provided atop said diffusely reflective walls.

6. The LED lighting fixture of claim 1 , wherein said LED support area includes a plurality of openings receiving said LEDs therethrough.

7. The LED lighting fixture of claim 1 , wherein said blocking optics include side emitting optics.

8. The LED lighting fixture of claim 1 , wherein said light output opening is rectangular.

9. The LED lighting fixture of claim 1 , wherein said LED support area is diffusely reflective.

10. A LED lighting fixture, comprising:
a housing having a LED support area, a diffusely reflective interior surface extending upward from and surrounding said LED support area, and a light output opening;
a plurality of LEDs adjacent said LED support area, said LEDs selectively generating a LED light output having a component emitting directly toward said light output opening;
said LEDs including at least two longitudinally extending rows of LEDs;
wherein, for each LED of said longitudinally extending rows of LEDs, the LED is configured to produce a color that is unique from any immediately preceding LED and unique from any immediately following LED of the longitudinally extending row to which the LED belongs; and the color of the LED is unique from the most closely adjacent LED of the longitudinally extending row to which the LED does not belong;
a plurality of blocking optics, each of said blocking optics provided over a different, respective LED of said plurality of LEDs and below said light output opening and redirecting at least said component of said LED light output of said respective LED toward said diffusely reflective interior surface, wherein at least one blocking optic of said plurality of blocking optics is configured to direct at least one other light component, of said LED light output of said respective LED, above an upper extent of said at least one blocking optic as said at least one other light component exits through a lateral surface of said at least one blocking optic; and
a diffusing cover lens provided across said light output opening.

11. The LED lighting fixture of claim 10 , wherein said diffusely reflective interior surface includes a plurality of rectangularly arranged walls.

12. The LED lighting fixture of claim 11 , wherein said LED support area is planar.

13. The LED lighting fixture of claim 12 , wherein said LED support area is provided at a base of said diffusely reflective interior surface.

14. The LED lighting fixture of claim 10 , wherein said blocking optics include at least one individual optic provided over a single of said LEDs.

15. The LED lighting fixture of claim 10 , wherein said diffusing cover lens is provided atop said diffusely reflective interior surface.

16. The LED lighting fixture of claim 10 , wherein said LEDs include LEDs of a third color and LEDs of a fourth color.

17. A LED lighting fixture, comprising:
a housing having a light output opening, a LED support area facing said light output opening, and at least one diffusely reflective wall extending between said LED support area and said light output opening;
a plurality of LEDs adjacent said LED support area, each of said LEDs selectively generating a LED light output having a component emitting directly toward said light output opening;
a plurality of blocking optics, each of said blocking optics provided over a different, respective LED of said plurality of LEDs and below said output opening and redirecting at least said component of said LED light output of said respective LED toward said at least one diffusely reflective wall, wherein at least one blocking optic of said plurality of blocking optics is configured to direct at least one other light component, of said LED light output of said respective LED, above an upper extent of said at least one blocking optic as said at least one other light component exits through a lateral surface of said at least one blocking optic; and
a diffusing cover lens provided across said light output opening.

18. The LED lighting fixture of claim 17 , wherein said at least one blocking optic is configured to upwardly direct a majority of said LED light output directly impinging on said lateral surface from said respective LED.

19. The LED lighting fixture of claim 1 , wherein said at least one blocking optic is configured to upwardly direct a majority of said LED light output directly impinging on said lateral surface from said respective LED.

20. The LED lighting fixture of claim 10 , wherein said at least one blocking optic is configured to upwardly direct a majority of said LED light output directly impinging on said lateral surface from said respective LED.

Assignees

• Koninkl Philips Nv

Inventors

• Lacroix Luc Guy Louis

Classifications

• F21V7/0033

  with successive reflections from one reflector to the next or following · CPC title

• F21Y2105/12

  characterised by the geometrical disposition of the light-generating elements, e.g. arranging light-generating elements in differing patterns or densities · CPC title

• F21K9/00 Primary

  Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers · CPC title

• F21K99/00

  Subject matter not provided for in other groups of this subclass · CPC title

• F21V13/04

  the elements being reflectors and refractors {(for vehicle rear lights F21S43/40)} · CPC title