Patent ID: 8979302
Filing Date: 2015-03-17
Classification: F21K,F21V,G02B

Abstract:
1. A LED array spot illuminator for providing light along an optical axis, comprising: a substrate; at least one array of multiple LED chips without individual packaging supported by said substrate, wherein the LED chips emit light within different wavelength ranges and are distributed laterally with respect to said axis over a light-emitting area, said LED chips having light emitting surfaces for emitting light in directions transverse to said area, an optical element adjacent to the light emitting surfaces of the LED chips in said at least one array and in the optical axis collecting light emitted by the LED chips; an optical device that collects and directs light emitted by the LED chips of the at least one array and collected by said optical element along the optical axis; an aperture located in the optical axis, wherein light collected by said optical element and said optical device and passed by the aperture forms a beam of light illuminating a spot; and a diffusing/scattering/homogenizing element in the optical axis to homogenize light within different wavelength ranges so that the beam illuminating the spot is substantially spectrally uniform across the surface of the illuminated spot.