Patent ID: 7524098

Claim:
A lens having an optical axis, comprising: a bottom surface; a curved reflecting surface having a concave side, wherein said concave side is oriented to face said bottom surface at an oblique angle, said reflecting surface surrounding said optical axis, said reflecting surface being rotationally symmetric about said optical axis; a first curved refracting surface having a concave side facing the concave side of the reflecting surface, said first curved refracting surface connected to said curved reflecting surface at a neck; and a second refracting surface extending as a smooth curve from the bottom surface and located between the first refracting surface and the bottom surface; wherein light entering the lens through the bottom surface and the neck and directly incident on the reflecting surface is reflected from the reflecting surface at its concave side to the first refracting surface and refracted by the first refracting surface to exit the lens in a lateral direction with respect to the optical axis of the lens, wherein a first portion of light entering the lens through the bottom surface away from the neck and directly incident on the second refracting surface is refracted by the second refracting surface to exit the lens in a lateral direction with respect to the optical axis of the lens, and wherein a second portion of light entering the lens through the bottom surface away from the neck and directly incident on the second refracting surface is refracted by the second refracting surface to the first refracting surface, refracted by the first refracting surface to the reflecting surface, reflected by the reflecting surface at its concave side to the first refracting surface and refracted by the first refracting surface to exit the lens in a lateral direction with respect to the optical axis of the lens.