Illumination device for direct-indirect illumination
First Claim
1. An illumination device comprising:
- a plurality of light-emitting elements (LEEs);
one or more optical couplers, wherein the light provided by the LEEs is in an emission angular range;
a light guide extending in a forward direction from a first end of the light guide to a second end of the light guide, wherein the optical couplers are arranged to receive the light provided by the LEEs and redirect it to the first end of the light guide where it has a collimated angular range when it is received by the light guide, and wherein the light guide is configured to guide the received light to the second end;
an optical extractor optically coupled to the light guide at the second end to receive the guided light, the optical extractor comprising a redirecting surface to reflect a first portion of the guided light, wherein the reflected light is output by the optical extractor to the ambient environment in a backward angular range, and wherein the redirecting surface has 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 one or more transmissive portions of the redirecting surface, the one or more optical elements to modify the light transmitted through the transmissive portions and to output the modified light to the ambient environment in a forward angular range.
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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.
154 Citations
53 Claims
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1. An illumination device comprising:
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a plurality of light-emitting elements (LEEs); one or more optical couplers, wherein the light provided by the LEEs is in an emission angular range; a light guide extending in a forward direction from a first end of the light guide to a second end of the light guide, wherein the optical couplers are arranged to receive the light provided by the LEEs and redirect it to the first end of the light guide where it has a collimated angular range when it is received by the light guide, and wherein the light guide is configured to guide the received light to the second end; an optical extractor optically coupled to the light guide at the second end to receive the guided light, the optical extractor comprising a redirecting surface to reflect a first portion of the guided light, wherein the reflected light is output by the optical extractor to the ambient environment in a backward angular range, and wherein the redirecting surface has 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 one or more transmissive portions of the redirecting surface, the one or more optical elements to modify the light transmitted through the transmissive portions and to output the modified light to the ambient environment in a forward angular range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. An illumination device comprising:
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a plurality of light-emitting elements (LEEs); one or more optical couplers extending in a forward direction, the optical couplers positioned to receive light emitted by the LEEs and configured to collimate the received light such that the collimated light provided by the one or more optical couplers has a first divergence; an optical extractor spaced apart from the one or more optical couplers at a first distance, wherein a combination of the first divergence and the first distance is configured such that the optical extractor receives all the collimated light, the optical extractor comprising a redirecting surface to reflect a first portion of the collimated light to the ambient environment in a backward angular range, wherein the redirecting surface has one or more transmissive portions to transmit a second portion of the collimated light in the forward direction; and one or more optical elements optically coupled to the one or more transmissive portions of the redirecting surface, the one or more optical elements to modify the light transmitted through the transmissive portions and to output the modified light to the ambient environment in a forward angular range. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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42. An illumination device comprising:
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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); 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, wherein the first set of reflective surfaces reflect guided light in a first angular range with a component antiparallel to the forward direction and a first component orthogonal to the forward direction, 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, wherein the transmissive surfaces are distributed laterally perpendicular to the direction of the first angular range, 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 (43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53)
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Specification