Patent ID: 7639918

Claim:
A light guide comprising: a body having an elongate shape; a plurality of light-reflecting faces extending along the body in the direction of a longitudinal axis of the light guide, the plurality of light-reflecting faces being disposed in a stepped fashion, the plurality of light-reflecting faces being configured to reflect light rays by the principle of total internal reflection; a plurality of light-emitting faces disposed along the body opposite the plurality of light-reflecting faces, each light-emitting face of the plurality of light-emitting faces being disposed opposite a corresponding light-reflecting face and being configured to emit light reflected by the corresponding light-reflecting face, the plurality of light-emitting faces being disposed on the body in a stepped fashion, wherein steps of the plurality of light-emitting faces correspond to steps of the plurality of light-reflecting faces; and a plurality of light-receiving faces disposed on the body, the plurality of light-receiving faces being configured to receive light into the light guide.