Patent ID: 8238050

Claim:
An optical device comprising a transparent body having a front surface comprising an outer aperture and an inner dome, and a rear surface comprising an outer reflector and an inner cavity; said transparent body operative to transfer light between an emitter location behind the inner rear face and a target in front of the front surface; wherein light in a first channel from the emitter location to the target is refracted at the cavity and refracted at the dome; wherein light in a second channel from the emitter location to the target is refracted at the cavity, totally internally reflected at the aperture, reflected at the reflector, and refracted at the aperture; wherein the cavity refracts substantially all light rays that fall thereon from the emitter location into the first channel or the second channel: and wherein the reflector comprises a plurality of grooves formed by two surfaces meeting at an edge, and wherein light in the second channel is reflected at the reflector by total internal reflection at the two surfaces forming a groove.