Abstract: An optical apparatus with a distance-to-height ratio, DHR, greater than 2, operable to emit light with a homogenized radiance distribution, the apparatus comprising a plurality of light sources, arranged in an array, a diffusor device at an exit surface of the apparatus, a transparent substrate, arranged between the plurality of light sources and the exit surface, the substrate comprising a plurality of freeform, FF, optical structures wherein the freeform structures are arranged on a bottom side of the transparent substrate facing the light sources.
Type:
Grant
Filed:
April 1, 2019
Date of Patent:
March 23, 2021
Assignee:
Joanneum Research Forschungsgesellschaft mbH