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Solid state continuous white light source

  • US 9,642,515 B2
  • Filed: 01/15/2013
  • Issued: 05/09/2017
  • Est. Priority Date: 01/20/2012
  • Status: Active Grant
First Claim
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1. An illumination system, comprising:

  • a first light source comprising a first LED which emits violet light and a first collimator which receives the violet light and emits a collimated beam of violet light;

    a second light source comprising a second LED which emits blue light and a second collimator which receives the blue light and emits a collimated beam of blue light;

    a third light source comprising a third LED which emits cyan light and a third collimator which receives the cyan light and emits a collimated beam of cyan light;

    a fourth light source comprising a fourth LED which emits red/orange light and a fourth collimator which receives the red/orange light and emits a collimated beam of red/orange light;

    a fifth light source comprising a plurality of LEDs which emit blue light, a luminescent rod positioned to receive the blue light, wherein the blue light is absorbed by the luminescent rod which then emits green light, and a fifth collimator which receives the green light and emits a collimated beam of green light;

    a controller configured to operate all of the first, second, third, fourth and fifth light sources simultaneously such that the collimated beams of violet light, blue light, cyan light, red/orange light, and green light are emitted simultaneously; and

    a plurality of dichroic mirrors which combine the collimated beams of violet light, blue light, cyan light, red/orange light, and green light to create a beam of white light which is directed at an input aperture of a light guide;

    wherein the white light is substantially continuous in the visible spectrum from 380 nm to 650 nm and has a spectral power which substantially equals or exceeds a usable spectral power of a 120 W metal halide lamp at substantially every visible wavelength between 380 nm and 650 nm.

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