Patent ID: 8025429

Claim:
An LED illumination lens for producing an output light beam through a LED light source, comprising: a lens having an incident surface defining an inner surface and a transmission surface opposite to said incident surface at an outer surface thereof, wherein said incident surface is a concave curved surface and said transmission surface is a convex curved surface, wherein a shape of said incident surface is a part of a first elliptical surface and a shape of said transmission surface is a part of a second elliptical surface such that light emitted from the LED light source first enters said incident surface, then passes through said lens and emits through said transmission surface to produce the output light beam, thereby dispersed light emitted at an edge side of the LED light source is refracted to shift to fall within the output light beam while light emitted through a front side of the LED light source is dispersed through said incident surface and said transmission surface to produce the output light beam which is uniform in light intensity while having a long and rod like shape.