Lighting assembly with light source array and light-directing optical element
A lighting assembly includes at least one light source array provided in a housing and a light scattering primary transmissive optical element having at least one focal region positioned substantially parallel or concentric with the light source array. Lens features of the optical element may include a Fresnel lens pattern to produce at least one focal region. An auxiliary transmissive optical element may be provided to further control light distribution and brightness uniformity.
1. A lighting assembly comprising;
a. at least one light source array;
b. a housing; and
c. a primary transmissive optical element comprising a bulk light transmissive material with internal or surface texturing light scattering features and further comprising lens features with focal properties such that the primary transmissive optical element has at least one focal region inside the lighting assembly which is substantially parallel or concentric with the at least one light source array;
wherein a focal region of the primary optical element is spatially arranged with respect to the at least one light source array and to produce a targeted light distribution.
2. The lighting assembly of claim 1 wherein the lens features comprises a Fresnel lens pattern.
3. The lighting assembly of claim 1 wherein the at least one light source array and the focal region of the primary transmissive optical element are spatially arranged to overlap along a focal axis of the primary light transmissive optical element to produce a collimated light distribution.
4. The lighting assembly of claim 1 wherein the at least one light source array is offset from a focal axis of the primary transmissive optical element to produce an asymmetric light distribution.
5. The lighting assembly of claim 1 wherein the focal region is a focal line and the at least one light source array extends linearly in parallel with the focal line.
6. The lighting assembly of claim 1 wherein the light scattering features are surface features upon one or both of an input face and output face of the primary optical element.
7. The lighting assembly of claim 1 wherein the geometry of the at least one light source array is selected from the following group; consisting of a linear array, parallel rows, rectangular grid, circular pattern and concentric rings.
8. The lighting assembly of claim 1 wherein the focal region is a focal point and the at least one light source array extends radially around the focal point.
9. The lighting assembly of claim 8 wherein the at least one light source array forms a circular ring.
10. The lighting assembly of claim 1 wherein the targeted light distribution comprises a lobe of light.
11. The lighting assembly of claim 10 wherein a specific width of the light lobe is achieved by controlling an amount of light scattering of the primary transmissive optical element.
12. The lighting assembly of claim 1 wherein light scattering features comprise dispersed regions of refractive index differing from that of the bulk light transmissive material.
13. The lighting assembly of claim 12 wherein the dispersed regions are comprised of polymer beads.
14. The lighting assembly of claim 1 wherein the housing and the primary transmissive optical element have three-dimensional structures that are two-dimensional cross-section areas linearly extended along a common longitudinal axis.
15. The lighting assembly of claim 14 wherein the housing and primary transmissive optical element comprise interlocking mounting features that hold the primary transmissive optical element and the at least one light source array in a configured spatial arrangement.
16. The lighting assembly of claim 1 further comprising an auxiliary transmissive optical element positioned sequentially in series before or after the primary transmissive optical element.
17. The lighting assembly of claim 16 wherein the auxiliary transmissive optical element is a lenticular or diffuser film or sheet.
18. The lighting assembly of claim 16 wherein the auxiliary transmissive optical element comprises lenticular features oriented substantially perpendicular to a Fresnel lens pattern in the primary light transmissive optical element.
19. The lighting assembly of claim 16 wherein visual brightness uniformity is increased as compared to a configuration without the auxiliary transmissive optical element.
20. The lighting assembly of claim 16 wherein the targeted light distribution of the primary transmissive optical element is redirected in an asymmetric manner by the auxiliary transmissive optical element.