Asymmetric linear LED luminaire design for uniform illuminance and color

Abstract

An LED lamp for illuminating a surface under a flat angle in linear lighting applications such as cove lighting and wall washing is provided. It produces a uniform intensity distribution and a uniform color output throughout the beam pattern of the light beam produced by a multi-color LED light source. The lamp comprises a body of an extruded profile. The body comprises at least one section with a mirrored surface and at least a lens section which allows exiting of light from the body. At least one LED preferably having a LED lens is provided at the inner side of the body. This combination of optical systems results in an asymmetric beam pattern from the source.

The invention claimed is: 
     
       1. A LED lamp for illuminating a surface comprising a body further comprising:
 a plurality of multi-color LED light sources;   a spherical cap lens covering each of the plurality of multi-color LED light sources and having a radius that is larger than a radius of a base of the spherical cap lens;   wherein the spherical cap lens further comprising a plurality of spherical cap lenses covering respective ones of the plurality of multi-color LED light sources, and wherein each of the plurality of multi-color LED light sources and each of the plurality of spherical cap lenses covering respective ones of the plurality of multi-color LED light sources are arranged distant to each other on a LED mounting plane and are aligned with their centers to a common center line with at least one paraboloidal section having its focus at the common center line of the plurality of multi-color LED light sources;   at least one section with a mirrored surface, for reflecting the light emitted by the at least one multi-color LED light source, the mirrored surface section further comprising the at least one paraboloidal section and at least one arc shaped reflector; and   at least one lens section forming an exit surface for the light.   
     
     
       2. The LED lamp of  claim 1 , wherein the body comprises a hollow profile. 
     
     
       3. The LED lamp of  claim 1 , wherein the body comprises an extruded profile. 
     
     
       4. The LED lamp of  claim 1 , wherein the body further comprises a backside reflector arranged behind a mounting plane of the plurality of multi-color LED light sources. 
     
     
       5. The LED lamp of  claim 1 , wherein the plurality of multi-color LED light sources, each comprising a plurality of LED chips. 
     
     
       6. The LED lamp of  claim 1 , wherein the mirrored surface is a total reflecting surface or a reflecting coated surface. 
     
     
       7. The LED lamp of  claim 1 , wherein the plurality of paraboloidal sections are provided being slightly rotated against each other. 
     
     
       8. The LED lamp of  claim 1 , wherein the at least one lens section comprises a Fresnel lens like structure. 
     
     
       9. The LED lamp of  claim 1 , wherein the at least one lens section comprises a prime lens for a main beam direction and an outside lens for an auxiliary beam direction is provided. 
     
     
       10. The LED lamp of  claim 9 , wherein the at least one arc shaped reflector deflects parts of the light emitted by the at least one multi-color LED light source to the outside lens and other parts of the light to the prime lens. 
     
     
       11. A linear LED fixture, comprising:
 a plurality of LED light sources arranged linearly on a substrate forming a first plane, each of the plurality of LED light sources having a respective spherical cap lens disposed thereupon, wherein the spherical cap lens includes a base radius that is less than the spherical radius;   a lens body;   an outside lens disposed along a second plane parallel to the first plane; and   a first reflective surface, that includes:
 a plurality of parabolic surfaces, the plurality of parabolic surfaces to reflect a first portion of light emitted by the plurality of LED light sources through the lens body to provide a first non-collimated light source; and 
 a plurality of convex surfaces, at least some of the plurality of convex surfaces to reflect a second portion of light emitted by the plurality of LED light sources through the outside lens to provide a second non-collimated light source.  
   
     
     
       12. The linear LED fixture of  claim 11  further comprising:
 a backside reflective surface disposed at a first angle with respect to the first plane, the backside reflective surface disposed proximate the substrate and the outside lens.  
 
     
     
       13. The linear LED fixture of  claim 12  wherein at least some of the plurality of convex surfaces to reflect a third portion of light emitted by the plurality of LED light sources such that the third portion of light falls incident on the backside reflective surface.  
     
     
       14. The linear LED fixture of  claim 13  wherein the backside reflective surface reflects the third portion of the light through the lens body.  
     
     
       15. The linear LED fixture of  claim 14  wherein the lens body comprises a light entrance surface and a planar light exit surface.  
     
     
       16. The linear LED fixture of  claim 15  wherein the light entrance surface of the lens body comprises a Fresnel lens-like light entrance surface.  
     
     
       17. The linear LED fixture of  claim 15  wherein the outside lens comprises a light entrance surface and a planar light exit surface.  
     
     
       18. The linear LED fixture of  claim 17  wherein the light exit surface of the lens body is disposed perpendicular to the light exit surface of the outside lens.  
     
     
       19. The linear LED fixture of  claim 11  wherein the plurality of LED light sources comprises a plurality of multi-color LED light sources.  
     
     
       20. The linear LED fixture of  claim 11  wherein the plurality of LED light sources is disposed at the focal point of at least one of the plurality of parabolic surfaces forming the first reflective surface.  
     
     
       21. The linear LED fixture of  claim 11  wherein the plurality of LED light sources is disposed at the focal point of at least two of the plurality of parabolic surfaces forming the first reflective surface.  
     
     
       22. The linear LED fixture of  claim 11  wherein the spherical cap lens includes a height radius perpendicular to the base radius that is less than one-half of the spherical radius.  
     
     
       23. A linear LED fixture, comprising:
 a plurality of LED light sources arranged linearly to define a plane, each of the plurality of LED light sources having a respective spherical cap lens disposed thereupon, each cap lens having a base diameter and a height radius less than half of the base diameter;   a plurality of parabolic surfaces to reflect a first portion of light emitted by the plurality of LED light sources toward a first lens oriented perpendicular to the plane; and   a plurality of convex surfaces to reflect a second portion of light emitted by the plurality of LED light sources toward a second lens oriented parallel to the plane.    
     
     
       24. The linear LED fixture of  claim 23  wherein the first lens comprises a Fresnel lens like structure.  
     
     
       25. The linear LED fixture of  claim 23  wherein the first lens provides non-collimated light.  
     
     
       26. The linear LED fixture of  claim 23  further comprising a backside reflective surface, wherein light reflected onto the backside reflective surface is reflected toward the first lens.  
     
     
       27. The linear LED fixture of  claim 26  wherein the backside reflective surface is adjacent to the second lens.  
     
     
       28. The linear LED fixture of  claim 27  wherein the backside reflective surface and second lens are oriented behind the plane.  
     
     
       29. The linear LED fixture of  claim 23  the plurality of LED light sources comprises a plurality of multi-color LED light sources.  
     
     
       30. The linear LED fixture of  claim 23  wherein light emitted by the plurality of LED light sources is refracted when leaving the respective spherical cap lenses.