Rectangular light duct extraction

摘要

The present disclosure describes light delivery and distribution components of a ducted lighting system having a cross-section that includes planar duct portions, and a light source. The delivery and distribution system (that is, light duct and light duct extractor) can function effectively with any light source that is capable of delivering light which is substantially collimated about the longitudinal axis of the light duct, and which is also preferably substantially uniform over the inlet of the light duct.

主权项

1. A lighting element, comprising:
a light duct having a longitudinal axis, a light duct cross-section perpendicular to the longitudinal axis, a reflective interior surface defining a cavity, and an exterior surface; a plurality of voids disposed in the reflective interior surface defining a light output surface, whereby light can exit the cavity; a turning film disposed adjacent to the light output surface and exterior to the cavity, the turning film comprising parallel prismatic microstructures, each of the parallel prismatic microstructures having a vertex adjacent the light output surface of the light duct; and a steering film comprising a plurality of ridges adjacent the turning film and opposite the light output surface, each ridge parallel to the longitudinal axis and disposed to refract an incident light ray from the turning film, wherein a light ray that exits the cavity through the light output surface is redirected by the turning film within a first plane perpendicular to the light duct cross-section, and further redirected by the steering film within a second plane parallel to the light duct cross section.