Patent ID: 9562670
Date: 2017-02-07
CPC Classifications: F21V,F21W,F21Y,G02B

Claim:
1. An illumination system comprising: a light source for emitting light with a basic emission distribution around a symmetry axis, and a collimator for redirecting light from the light source to substantially homogeneously illuminate at least a part of an illuminating surface, at least a section of the homogeneously illuminated illuminating surface extending substantially parallel to the symmetry axis, the collimator comprising a concave input window for receiving light from the light source, and further comprising an at least partially convex output window for directing light towards the illuminating surface, a convex part of the output window being shaped for refracting light emitted by the light source in a direction away from the illuminating surface towards the illuminating surface and for generating an altered emission distribution being asymmetric with respect to the symmetry axis of the basic emission distribution to substantially homogeneously illuminate the at least part of the illuminating surface, and a second part of the output window that is flatter than the convex part, is disposed closer to the part of the illuminating surface than the convex part, and is configured to refract light emitted by the light source to a portion of the part of the illuminating surface that is closer to the collimator than a portion of the part of the illuminating surface to which the convex part directs light from the light source.