Full spectrum LED illuminator having a mechanical enclosure and heatsink
An apparatus for providing a light output to an optical guide for illumination of an imaged object including a plurality of solid state light-emitting sources each of which are independently powered and independently controlled, each light-emitting source emitting light at a wavelength which is different from the wavelength emitted by the other light-emitting sources. The apparatus also includes a heat sink configured to thermally couple the plurality of solid state light-emitting sources and provide conduction of heat generated by the plurality of solid state light-emitting sources. The apparatus further includes an optical elements to collect, collimate, and combine the emissions from the plurality of solid state light-emitting sources into a combined beam of light to be optically coupled to the light guide.
1. An apparatus for providing a light output to an optical guide for illumination of an object to be imaged, the apparatus comprising:
a plurality of solid state light-emitting sources each of which are independently powered and independently controlled, each light-emitting source emitting light at a wavelength that is different from a wavelength emitted by the other light-emitting sources;
a heat sink configured to thermally couple the plurality of solid state light-emitting sources and provide conduction of heat generated by the plurality of solid state light-emitting sources, wherein the heat sink comprises a heat spreader plate having a planar surface and each of the solid-state light-emitting sources is mounted to the planar surface to orient each of the solid-state light-emitting sources along a common optical plane;
optical elements configured to collect, collimate, and combine the emissions from the plurality of solid state light-emitting sources into a combined beam of light to be optically coupled to a light guide at an output of the apparatus; and
a mechanical enclosure comprising a linear array of input ports matching a linear pattern of the light-emitting sources on the planar surface, wherein at least some of the optical elements are not directly attached to the light-emitting sources and the at least some of the optical elements not directly attached to the light-emitting sources are mounted in the mechanical enclosure and the heat spreader plate is configured to be assembled to the enclosure so as to seal the enclosure,
wherein light emitted from each of the light-emitting sources travels an optical path length from the respective light-emitting source to the output, the optical path lengths from the light-emitting sources to the output varying based on the wavelength of the light emitted from the respective light-emitting source.
2. The apparatus of claim 1 , wherein the heat sink comprises a passive cooling system.
3. The apparatus of claim 2 , wherein the passive cooling system is a finned heat sink or a heat pipe.
4. The apparatus of claim 1 , wherein the heat sink comprises an active cooling system.
5. The apparatus of claim 4 , wherein the active cooling system is a thermoelectric cooler or a liquid cooler.
6. The apparatus of claim 1 , wherein the solid state light-emitting sources comprise light emitting diodes and diode lasers.
7. The apparatus of claim 1 , wherein the optical elements comprise a field lens and an aspheric lens configured to collect and collimate the emission from each of the plurality of solid state light-emitting sources.
8. The apparatus of claim 1 , further comprising a dichroic filter configured to couple the collimated emission from each of the plurality of solid state light-emitting sources into the combined beam of light directed along a common path to an output port.
9. The apparatus of claim 1 , wherein the optical elements are arranged such that the optical path length of each of the plurality of solid state light-emitting sources increases as the wavelength increases.
10. The apparatus of claim 1 , wherein the optical elements are arranged such that the optical path length of each of the plurality of solid state light-emitting sources increases as the wavelength decreases.
11. The apparatus of claim 1 , wherein the common optical plane comprises focal points of a compound collector group.
12. The apparatus of claim 1 , wherein the heat spreader plate comprises copper, aluminum, iron, diamond, gold or silver.
13. The apparatus of claim 1 , wherein the heat sink comprises a passive cooling system or an active cooling system and the passive or active cooling system is arranged on a side of the heat spreader plate opposite the planar surface.