Patent ID: 7731400

Claim:
A lighting or signaling device for a motor vehicle which is capable of emitting a linear beam essentially in a direction of an optical axis, and which comprises: a light source; a light ray guiding plate that comprises an input edge for inputting light rays, an output edge for outputting said light rays tangentially to said light ray guiding plate, and a rear edge for reflecting said light rays coming from said light source in a direction of said output edge, said light ray guiding plate comprising a first face and generally opposing second face between said rear edge and said output edge; wherein said light ray guiding plate comprises an area for coupling with said light source shaped so that said light rays emitted by said light source are propagated radially at said area for coupling around a source axis, wherein said light ray guiding plate is shaped so that said light rays propagate in meridian incident propagation planes normal to said light ray guiding plate between said light source and said rear edge for reflecting, in reflected propagation planes normal to said light ray guiding plate between said rear edge for reflecting and said output edge, and wherein said rear edge for reflecting is shaped so that said reflected propagation planes have an orientation with respect to the optical axis such that said lighting or signaling device is capable of emitting a linear light beam along an essentially longitudinal optical axis; said reflected propagation planes being generally parallel to said optical axis and generally orthogonal to said output edge so that said light ray guiding plate provides a generally linear beam along said longitudinal optical axis and in an arc about said optical axis.