Light engine for and method of simulating a flame

  • US 10,125,937 B2
  • Filed: 05/01/2017
  • Issued: 11/13/2018
  • Est. Priority Date: 05/05/2015
  • Status: Active Grant
First Claim
Patent Images

1. A lighting device, comprising:

  • a three dimensional substrate extending about a substrate axis, the three dimensional substrate having a top and a bottom separated from one another along the substrate axis;

    a plurality of LEDs mounted to the three dimensional substrate;

    the plurality of LEDs comprising a lower grouping of the LEDs, an upper grouping of the LEDs, and a middle grouping of the LEDs;

    the LEDs in the lower grouping being relatively near the substrate bottom;

    the LEDs in the upper grouping being relatively near the substrate top;

    the LEDs in the middle grouping being between the LEDs in the lower and upper groupings;

    at least some of the LEDs forming rows in planes that extend generally perpendicular to the substrate axis;

    a first subset of the plurality of LEDs forming one of the rows;

    each of the LEDs in the first subset having a respective beam axis that is;

    (a) perpendicular to the substrate axis; and

    (b) angularly offset about the substrate axis from each other beam axis of the LEDs in the first subset;

    a power interface for transmitting electricity to the plurality of LEDs;

    a control circuit in communication with each of the LEDs to cause the plurality of LEDs to simulate a flame, wherein the control circuit;

    (i) drives at least some of the LEDs in the lower grouping to do at least one of the following to simulate combustion at a bottom of a flame;

    pulse, change intensity, and change color;

    (ii) drives at least some of the LEDs in the middle grouping to sequentially turn on to simulate a rise in flame height; and

    (iii) drives at least some of the LEDs in the upper grouping to flicker to simulate a flame tip, the LEDs in the upper grouping being driven less frequently on average than the LEDs in the middle grouping; and

    a shroud at least partially encasing at least some of the LEDs.

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