Lighting unit and luminaire for road and/or street lighting

• US 9,062,843 B2
• Filed: 03/17/2010
• Issued: 06/23/2015
• Est. Priority Date: 03/17/2009
• Status: Active Grant

• Current Assignee: Thorn Europhane SA (Zumtobel Group AG)
• Original Assignee: Thorn Europhane SA (Zumtobel Group AG)
• Inventors: Rami, Jean-Paul, Rocard, Florian
• Primary Examiner(s): Sember, Thomas M
• Application Number:
  US13/203,986
• Publication Number:
  US 20120057340A1
• Time in Patent Office: 1,924 Days
• US Class Current: 1/1
• CPC Class Codes: F21S 8/086 with lighting device attached sideways of the standard, e.g. for roads and highways
• CPC Class Codes: F21V 11/02 using parallel laminae or strips, e.g. of Venetian-blind type F21V11/06 takes precedence
• CPC Class Codes: F21V 7/0083 Array of reflectors for a cluster of light sources, e.g. arrangement of multiple light sources in one plane combination of two or more reflectors F21V7/0025
• CPC Class Codes: F21W 2131/103 of streets or roads
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: Y02B 20/72 in street lighting

Abstract

A lighting unit for use in a luminaire, in particular a luminaire for road and/or street lighting, comprising a plurality of light sources and a reflector unit arranged in front of the light sources to control the distribution of the light emitted by said light sources, wherein he reflector unit comprises a plurality of reflector elements arranged parallel to each other, with at least some of the reflector elements comprising a first portion adapted for total reflection and a second portion adapted for partial reflection.

Claims

1. Lighting unit for use in a luminaire, said lighting unit having a plurality of LED light sources and a reflector unit arranged in front of said LED light sources to control the distribution of the light emitted by said LED light sources, wherein said reflector unit comprises a plurality of reflector elements arranged parallel to each other, wherein at least some of said reflector elements comprise a first portion adapted for total reflection and a second portion adapted for partial reflection,

wherein the LED light sources and reflector elements are arranged on a common mounting surface that is planar or roughly planar,

wherein the LED light sources are arranged in parallel rows, a row of LED light sources being located between two adjacent reflector elements, and

wherein the reflector elements extend from said common mounting surface.

2. Lighting unit according to claim 1, wherein the first portions of said reflector elements are—

seen in a light emitting direction—

located nearer to the light sources compared to the second portions of said reflector elements.

3. Lighting unit according to claim 1, wherein the reflector elements are arranged on said common mounting surface together with the light sources.

4. Lighting unit according to claim 3, wherein the common mounting surface is provided by a surface of a cooling element.

5. Lighting unit according to claim 1, wherein the light sources are arranged in parallel rows, a row of light sources being located between two adjacent reflector elements.

6. Light unit according to claim 5, wherein the rows of light sources and the reflector elements are arranged in an alternating manner.

7. Lighting unit according to claim 5, wherein groups comprising two reflector elements with a row of light sources placed between the reflector elements are formed.

8. Lighting unit according to claim 1, wherein at least for some of the reflector elements the second portion is inclined with respect to the first portion.

9. Lighting unit according to claim 1, wherein the second portions of said reflector elements comprise a partial reflective coating.

10. Lighting unit according to claim 1, wherein the second portions of said reflector elements comprise cutouts.

11. Luminaire for road and/or street lighting, said luminaire having a lighting head with a housing in which at least one lighting unit according to claim 1 is accommodated.

12. Luminaire according to claim 11, wherein the lighting head extends with respect to a horizontal surface by an acute angle between 0 degrees and 15 degrees.

13. Luminare according to claim 11, wherein several lighting units are accommodated in the lighting head which lighting units are identical.

14. Luminare according to claim 11, wherein several lighting units are accommodated in the lighting head which lighting units differ from each other with respect to the light distribution and/or light color.

15. Lighting unit according to claim 10, wherein the cutouts are slots or openings.