Patent ID: 7963680

Claim:
A lens for a light emitting diode formed from a material having a refractive index of n, the lens comprising a base; a first curved circumferential surface extending from the base; a curved center-edge surface extending from the first curved circumferential surface, and a curved centermost surface extending from the curved center-edge surface, wherein a distance from a center of the base to a point of the curved center-edge surface is shorter than a radius of curvature for the point of the curved center-edge surface, and wherein the curved centermost surface has a concave shape when viewed from the center of the base, wherein the lens includes a hollow portion formed from the base of the lens, wherein the hollow portion forms an inner surface of the lens and is comprised of a second curved circumferential surface and a curved central surface extending from the second curved circumferential surface, and wherein a distance from the center of the base to a point of the curved central surface is longer than a radius of curvature for the point of the curved central surface.