Patent ID: 8662716

Claim:
An optical element comprising: an outer section having a light input surface, a cylindrical light output surface, and a circumferential curved sidewall in a cross-sectional view, wherein the sidewall extends between the light input surface at one end and the light output surface at the other end and has a curvature which provides substantially total internal reflection of light emitted from the light input surface and directly incident upon the sidewall in a direction substantially parallel to the optical axis of the light emitted from the light input surface; a circumferential curved inner TIRing section in the cross-sectional view and recessed within the outer section such that the light emitted from the input surface and incident upon the curved inner section is not incident upon the output surface; a circumferential substantially non-curved upper section in the cross-sectional view and positioned at approximately a 45° angle relative to the optical axis of the light emitted from the input surface; a circumferential substantially non-curved sidewall in the cross-sectional view and extending from the inner section to the circumferential substantially non-curved upper section.