IPC分类号：
F21V5/02 | G02B5/02
国民经济行业分类号：
C4350 | C3874 | C4090 | C3879
当前申请(专利权)人：
BRIGHT VIEW TECHNOLOGIES CORPORATION
原始申请(专利权)人：
BRIGHT VIEW TECHNOLOGIES CORPORATION
当前申请(专利权)人地址：
1100 Boulders Parkway,Richmond, VA 23225,US
摘要：
A light transmissive structure includes a light transmissive substrate having first and second opposing faces and array of microprism elements on the first face. A respective microprism element includes at least one ring comprising a plurality of microstructure pyramids that is rotated randomly and/or pseudorandomly on the first face about an axis that is orthogonal to the substrate relative to at least one other microprism element. The light transmissive structure is configured to receive light from a light source facing the first face and distribute the light emerging from the second face in a 2D batwing distribution.
技术问题语段：
The technical problem addressed in this patent is creating light sources that provide special lighting patterns, particularly batwing lighting patterns, in a cost-effective and efficient way. The current methods of creating batwing light sources involve using a large number of luminaires and modifying the intensity distribution of the light sources. The patent seeks to improve the efficiency and effectiveness of creating these light sources.
技术功效语段：
The patent text describes a type of lighting fixture that creates a "batwing" lighting pattern. These fixtures are commonly used in industrial and commercial settings to provide uniform illumination. The "technical effect" of this patent is to provide a more practical and aesthetically pleasing batwing lighting pattern that can be achieved with a single ceiling luminaire, while still maintaining the benefits of a batwing distribution, such as energy efficiency and uniform illumination. The patent also discusses the various methods for creating a batwing lighting pattern and how to achieve a desirable level of illuminance variation across a surface.
权利要求：
What is claimed is:
1. A light transmissive structure comprising:
a light transmissive substrate having first and second opposing faces; and
an array of microprism elements on the first face, a respective microprism element comprising at least one ring comprising a plurality of microstructure pyramids that is rotated randomly and/or pseudorandomly on the first face about an axis that is orthogonal to the substrate relative to at least one other microprism element;
wherein the light transmissive structure is configured to receive light from a light source facing the first face and distribute the light emerging from the second face in a 2D batwing distribution.
2. The light transmissive structure of claim 1 wherein a respective microprism element comprises first and second concentric rings each comprising a plurality of microstructure pyramids, and wherein the first and second rings are each rotated randomly and/or pseudorandomly on the first face relative to one another.
3. The light transmissive structure of claim 2 wherein the second ring surrounds the first ring and comprises a first microstructure pyramid comprising a face that faces a center of the first and second concentric rings and a second microstructure pyramid that is adjacent the first pyramid and comprising a face that faces away from the center of the first and second concentric rings.
4. The light transmissive structure of claim 1 wherein a respective microprism element comprises a plurality of concentric rings, a respective ring comprising a plurality of microstructure pyramids.
5. The light transmissive structure of claim 4 wherein a respective ring is rotated randomly and/or pseudorandomly on the first face relative to the other rings in a respective microprism element.
6. The light transmissive structure of claim 4 wherein:
the plurality of concentric rings comprises a central ring and a plurality of surrounding rings; a respective surrounding ring comprising a first microstructure pyramid comprising a face that faces a center of the plurality of concentric rings and a second microstructure pyramid that is adjacent the first pyramid and comprising a face that faces away from the center of the plurality of concentric rings.
7. The light transmissive structure of claim 4 wherein a majority of the microstructure pyramids in a respective ring comprise a face that is oriented at a specific angle relative to acenter of the plurality of concentric rings.
8. The light transmissive structure of claim 7 wherein substantially all of the microstructure pyramids in a respective ring comprise a face that is oriented at a specific angle relative to the center of the plurality of concentric rings.
9. The light transmissive structure of claim 4 wherein the plurality of concentric rings comprises at least 5 rings.
10. The light transmissive structure of claim 9 wherein the plurality of concentric rings comprises at least 10 rings.
11. The light transmissive structure of claim 1 wherein a respective microstructure pyramid is a triangular pyramid.
12. The light transmissive structure of claim 1 wherein the array of microprism elements extends over substantially the entire first face of the substrate.
13. The light transmissive structure of claim 1 wherein a respective microstructure pyramid and/or ring is substantially undetectable by the naked eye at a viewing distance of about three feet.
14. The light transmissive structure of claim 1 wherein the light transmissive structure is configured to produce a visible pattern to a viewer of the light transmissive structure at a viewing distance of about three feet, the visible pattern corresponding to the array of microprism elements on the first face.
15. The light transmissive structure of claim 1 wherein substantially all of the microprism elements comprise a plurality of concentric rings each comprising a plurality of microstructure pyramids.
16. The light transmissive structure of claim 1 wherein adjacent microprism elements are in contact with one another.
17. The light transmissive structure of claim 1 wherein the array of microprism elements comprises gaps between at least some of the microprism elements, the light transmissive structure further comprising gap-filling microstructures in at least some of the gaps.
18. The light transmissive structure of claim 1 wherein the light transmissive structure is configured to receive light having a Lambertian distribution from a light source facing the first face and distribute the light emerging from the second face in a 2D batwing distribution.
19. The light transmissive structure of claim 1 wherein the light transmissive structure is configured to receive light having a light distribution having a Full Width at Half Maximum (FWHM) of at least about 30 degrees, at least about 40 degrees, at least about 60 degrees and/or at least about 80 degrees from a light source facing the first face and distribute the light emerging from the second face in a 2D batwing distribution.
20. The light transmissive structure of claim 1 further comprising at least one diffusion feature comprising:
surface roughness on at least some of the microstructure pyramids;
a diffuser on the second face of the substrate;
a light scattering agent in at least some of the microstructure pyramids and/or in the substrate; and/or
a diffusive coating on at least some of the microstructure pyramids.
21. The light transmissive structure of claim 20 wherein the light transmissive structure is configured to receive collimated and/or near collimated light from a light source facing the first face and distribute the light emerging from the second face in a 2D batwing distribution.
22. The light transmissive structure of claim 1 in combination with at least one light source and a housing that is configured to hold the at least one light source and the light transmissive substrate so that light from the light source impinges on the first face of the substrate and emerges from the second face of the substrate in a 2D batwing distribution.
23. The combination of claim 22 wherein the housing defines a light exit surface area where the substrate is held, and wherein a respective microprism element has an area on the first face of the substrate that is at least one order of magnitude smaller than the light exit surface area.
24. The combination of claim 23 wherein a respective microprism element has an area on the first face of the substrate that is at least two orders of magnitude smaller than the light exit surface area.
25. The combination of claim 24 wherein a respective microprism element has an area on the first face of the substrate that is at least four orders of magnitude smaller than the light exit surface area.
26. The combination of claim 22 wherein the housing defines a light exit surface area where the substrate is held, and wherein the array of microprism elements on the first face of the substrate extends over substantially the entire light exit surface area.
27. The combination of claim 22 wherein the light source is an array of LEDs with a spacing between adjacent LEDs, and wherein a respective microprism element has a size that generally corresponds to the spacing between adjacent LEDs.
28. The light transmissive structure of claim 1 in combination with at least one light source wherein the light transmissive substrate is suspended under the light source so that light from the light source impinges on the first face of the substrate and emerges from the second face of the substrate in a 2D batwing distribution.
29. A method of fabricating a light transmissive structure, the method comprising: imaging onto a photoimageable material an image of a plurality of microstructure pyramids having a geometric feature that is configured to distribute light transmitted through the microstructure pyramids in a 2D batwing distribution; and
using the photoimageable material that was imaged to replicate an image of a plurality of microstructure pyramids in and/or on a substrate, the plurality of microstructure pyramids also having a geometric feature that is configured to distribute light transmitted through the microstructure pyramids in a 2D batwing distribution.
30. The method of claim 29 wherein the imaging comprises scanning a laser across the photoimageable material, the laser defining the image of a plurality of
microstructure pyramids having the geometric feature that is configured to distribute light transmitted through the microstructure pyramids in a 2D batwing distribution.
31. A light transmissive structure comprising:
a light transmissive substrate having first and second opposing faces; and
a plurality of pyramid microprisms on the first face, wherein the microprisms are distributed on the first face of the substrate with a plurality of different pyramid face orientation angles measured from an edge of the substrate;
wherein the light transmissive structure is configured to receive light from a light source facing the first face and distribute the light emerging from the second face in a 2D batwing distribution.
32. The light transmissive structure of claim 31 wherein the microprisms are distributed on the first face of the substrate in generally equal measure for each of the plurality of pyramid face orientation angles.
33. The light transmissive structure of claim 31 wherein a respective pyramid microprism is rotated randomly and/or pseudorandomly on the first face relative to at least one other pyramid microprism.
34. A light transmissive structure comprising:
a light transmissive substrate having first and second opposing faces; and an array of microprism elements on the first face, a respective microprism element comprising a plurality of concentric microprism patterns, a respective microprism pattern comprising a plurality of triangular pyramids arranged in a generally elliptical configuration; wherein the light transmissive structure is configured to receive light from a light source facing the first face and distribute the light emerging from the second face in a 2D batwing distribution.
35. The light transmissive structure of claim 34 wherein a respective pyramid comprises a face that is oriented at a specific angle relative to a center of the plurality of concentric microprism patterns.
36. The light transmissive structure of claim 34 wherein a respective microprism element comprises a microprism pattern that is rotated randomly and/or pseudorandomly on the first face relative to at least one other microprism element.