Patent ID: 7222995

Claim:
A lens for a light emitting device, comprising: an aspherical reflecting surface, having a focal point on an optical axis of symmetry, for reflecting light rays emitted from a source located approximately at the focal point in a forward direction and wherein the reflected light rays are emitted approximately within a predetermined angle with respect to the optical axis; and a spherical refracting surface disposed in the path of the reflected light rays emitted from the source, centered on and normal to the optical axis, concave in the forward direction of the reflected light rays and intersecting the aspherical reflecting surface at a boundary equidistant from the optical axis; wherein the spherical refracting surface includes a plurality of N concentric annular surfaces, each annular surface having a cross section convex in the forward direction and disposed substantially at uniform radial intervals between the optical axis and the intersection with the aspherical reflecting surface.