Patent ID: 7160522

Claim:
Device for concentrating radiant energy wherein said device is axisymmetrical or cylindrical and is configured to transform the edge rays of an input extended ray bundle into edge rays of an output extended ray bundle, the optical spread of said input and output bundles being greater than ten degrees at one or more of the optical surfaces of said device, that illuminates a receiver, both of said bundles being defined in the plane of a cross-section, by: a) A lens L 1 comprising on one side a refractive aspheric surface, S 1 , on which the input bundle impinges, and on the other side, S 2 , another refractive aspheric surface in its central region and a discontinuous-slope structure in its external region, said discontinuous-slope structure cross-section comprising teeth with two aspheric faces such that one of them, V, is is configured to be parallel to the flow lines of the bundle transmitted by said surface S 1 , and the other face, T, os configured to reflect the bundle by total internal reflection toward the face V where it is retmoted so that no ray intercepts an adjacent tooth and that a nearest edge ray to do so is tangent to that tooth, and b) A second lens L 2 that surrounds the receiver composed of a refractive aspheric surface on which the bundle transmitted by the lens L 1 impinges.