Illumination device for direct-indirect illumination
First Claim
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 received light to the second end via total internal reflection (TIR), wherein the light guide has two parallel side surfaces that form a cylinder shell; and
an optical extractor optically coupled to the light guide at the second end to receive the guided light, the optical extractor being formed from a transparent, solid material and comprising;
a first set of reflective surfaces to reflect a first portion of the guided light,a first set of transmissive surfaces to transmit a second portion of the guided light to an ambient environment in the forward direction, the reflective surfaces being separated by the transmissive surfaces, anda curved output surface arranged to transmit the light reflected by the reflective surfaces to the ambient environment in a backward direction,wherein the transmissive surfaces are shaped such that each transmissive surface modifies at least an associated propagation direction or an associated divergence of the forward transmitted light in a different manner relative to adjacent transmissive surfaces.
1 Assignment
0 Petitions
Accused Products
Abstract
An illumination device includes a plurality of light-emitting elements (LEEs); a light guide extending in a forward direction from a first end to a second end to receive at the first end light emitted by the LEEs and to guide the received light to the second end; an optical extractor optically coupled to the second end to receive the guided light, the optical extractor including a redirecting surface to reflect a first portion of the guided light, the reflected light being output by the optical extractor in a backward angular range, and the redirecting surface having one or more transmissive portions to transmit a second portion of the guided light in the forward direction; and one or more optical elements optically coupled to the transmissive portions, the optical elements to modify the light transmitted through the transmissive portions and to output the modified light in a forward angular range.
-
Citations
14 Claims
-
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 received light to the second end via total internal reflection (TIR), wherein the light guide has two parallel side surfaces that form a cylinder shell; and an optical extractor optically coupled to the light guide at the second end to receive the guided light, the optical extractor being formed from a transparent, solid material and comprising; a first set of reflective surfaces to reflect a first portion of the guided light, a first set of transmissive surfaces to transmit a second portion of the guided light to an ambient environment in the forward direction, the reflective surfaces being separated by the transmissive surfaces, and a curved output surface arranged to transmit the light reflected by the reflective surfaces to the ambient environment in a backward direction, wherein the transmissive surfaces are shaped such that each transmissive surface modifies at least an associated propagation direction or an associated divergence of the forward transmitted light in a different manner relative to adjacent transmissive surfaces. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
-
Specification