Light Guide Illumination Device With Light Divergence Modifier

摘要

An illumination device includes a light-emitting element (LEEs); a light guide extending in a forward direction from a first end to a second end to receive at the first end LEE light and to guide the light to the second end, such that divergence of the light received at the first end and divergence of the guided light that reaches the second end are substantially the same; a light divergence modifier optically coupled to the light guide at the second end to receive the guided light, to modify the divergence of the guided light, such that the light provided by the light divergence modifier has a modified divergence different from the divergence of the guided light; and an optical extractor optically coupled to the light divergence modifier, to output into the ambient environment light provided by the light divergence modifier as output light in one or more output angular ranges.

主权项

1. An illumination device comprising:
a plurality of light-emitting elements (LEEs); a light guide extending in a forward direction from a first end of the light guide to a second end of the light guide, the light guide being positioned to receive at the first end light emitted by the LEEs and configured to guide the light to the second end, wherein divergence of the light received at the first end and divergence of the guided light that reaches the second end are substantially the same; a light divergence modifier having an input aperture optically coupled to the light guide at the second end to receive the guided light and an output aperture, the light divergence modifier being flared such that the input aperture is smaller than the output aperture, thereby light provided by the light divergence modifier at the output aperture has a modified divergence smaller than the divergence of the guided light; and an optical extractor optically coupled to the output aperture of the light divergence modifier and comprising a first redirecting surface, the first redirecting surface of the optical extractor being adapted to reflect at least a portion of the light provided by the light divergence modifier in a first direction that has a component orthogonal to the forward direction and another component in a backward direction, such that the optical extractor to outputs into the ambient environment light reflected by the first redirecting surface as first output light in a first output angular range wherein the first output angular range relates to the first direction.