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Illumination device with light emitting diodes

  • US 9,086,213 B2
  • Filed: 10/10/2008
  • Issued: 07/21/2015
  • Est. Priority Date: 10/17/2007
  • Status: Active Grant
First Claim
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1. A light emitting diode illumination device comprising:

  • a mounting board having electrical connections;

    a reflective material disposed on a top surface of the mounting board;

    a heat sink thermally coupled to the mounting board;

    a plurality of light emitting diodes mounted on the top surface of the mounting board and coupled to the electrical connections, wherein the light emitted by the plurality of light emitting diodes is emitted into a non-solid material, the plurality of light emitting diodes producing light having a color point;

    a light mixing cavity having a circular configuration defined by a reflective sidewall insert element that is fixedly positioned within a cavity formed by at least one sidewall coupled to the mounting board, the reflective sidewall insert element having at least one type of wavelength converting material on sidewalls, and wherein the light from the plurality of light emitting diodes is received and combined by the light mixing cavity;

    a window covering an output port through which light from the light mixing cavity is transmitted, the window including a layer of wavelength converting material, wherein the at least one type of wavelength converting material on the reflective sidewall insert element is configured to alter the color point of the light produced by the plurality of light emitting diodes to produce a desired color point for the light transmitted through the output port, wherein the reflective sidewall insert element extends from the reflective material disposed on the top surface of the mounting board to the window; and

    a central reflective element coupled to the mounting board at a center position of the mounting board, the central reflective element extending from the mounting board towards the window wherein the central reflector is wider near the mounting board than near the window.

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