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Illumination device for direct-indirect illumination

  • US 10,725,229 B2
  • Filed: 10/08/2018
  • Issued: 07/28/2020
  • Est. Priority Date: 09/17/2013
  • Status: Active Grant
First Claim
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1. An illumination device comprising:

  • a light-emitting element (LEE);

    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 LEE and configured to guide the received light to the second end, wherein the light guide has rotational symmetry;

    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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