US 12,169,064 B2
Microstructures for transforming light having Lambertian distribution into batwing distributions
Bing Shen, Cary, NC (US); Ken G. Purchase, Morrisville, NC (US); Thomas A. Rinehart, Durham, NC (US); and John W. Wilson, Durham, NC (US)
Assigned to Brightview Technologies, Inc., Durham, NC (US)
Filed by Brightview Technologies, Inc., Durham, NC (US)
Filed on Apr. 10, 2023, as Appl. No. 18/297,880.
Application 18/297,880 is a continuation of application No. 17/841,713, filed on Jun. 16, 2022, granted, now 11,655,957.
Application 17/841,713 is a continuation of application No. 16/962,155, granted, now 11,391,437, issued on Jul. 19, 2022, previously published as PCT/US2019/015600, filed on Jan. 29, 2019.
Claims priority of provisional application 62/623,894, filed on Jan. 30, 2018.
Prior Publication US 2023/0243482 A1, Aug. 3, 2023
Int. Cl. F21V 5/00 (2018.01); F21Y 115/10 (2016.01)
CPC F21V 5/005 (2013.01) [F21Y 2115/10 (2016.08)] 11 Claims
OG exemplary drawing
 
1. A light transmissive substrate for transforming a Lambertian light distribution into a batwing light distribution, the light transmissive substrate comprising:
a) a substrate comprising a first surface comprising a plurality of microstructures forming an array having rows and columns and comprising a second surface on a side of the substrate opposite to the first surface, wherein each of the plurality of microstructures has a shape of a pyramid having a roof angle that extends in a direction away from the second surface, the substrate configured to receive light in a Lambertian distribution from a light source at the first surface and configured to transform the light into a three-dimensional batwing distribution exiting the second surface,
wherein the roof angle is chosen to provide a desired intensity at nadir and a desired shape of the three-dimensional batwing distribution.