High efficiency LED light source arrangement
AssigneeKoninklijke Philips Electronics N.V.
InventorsChristoph Gerard August Hoelen, Johannes Petrus Maria Ansems
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Abstract
A light source (100) comprises a number of optical components aligned concentrically along an optical axis (115). The optical components include an array of light emitting diodes (101), a dielectric collimator (109) having surfaces configured to provide total internal reflection of light emitted from the array of diodes, and a second stage reflector (113) to further collimate the beam and which also may be based on total internal reflection by a prism structure on the outside.
Claims29
A lighting system comprising a plurality of optical components aligned concentrically along an optical axis, where the components include:
- a plurality of light sources that emit light of at least a respective first and second color,
- a dielectric collimator having an entry aperture and an exit aperture, said entry aperture being in optical contact with the light sources, said collimator having facetted surfaces configured to provide total internal reflection of light emitted from the light sources and thereby providing color-homogenized and collimated light exiting from the exit aperture, and
- an optical element having an entry aperture and an exit aperture and configured to further color homogenize and collimate the light exiting from the collimator, wherein the collimator and/or the optical element comprise a transparent dielectric having an outside surface comprising a plurality of elongated prism structures.
Dependencies are inferred from the claim text.