Patent ID: 7661860

Claim:
A device for a motor vehicle for lighting or signalling in a longitudinal emission direction, said device comprising: at least one light source emitting light rays; and at least one light guide sheet in which the light rays issuing from said at least one light source spread by successive reflections; wherein said at least one light guide sheet comprises at one end a reflective layer so as to redirect the light rays into said at least one light guide sheet, an output contour of said at least one light guide sheet, at an end remote from the reflective layer, comprises a reflective profile inclined relative to a longitudinal axis of said at least one light guide sheet, so as to reflect the light rays generally in an emission direction which is substantially parallel to said longitudinal axis, said output contour being generally annular or circular; wherein the reflective layer of said at least one light guide sheet has an ellipsoidal profile, the at least one light source being arranged at a first focal point of the ellipsoidal profile and the center of the arc of a circle-shaped output contour is arranged at a second focal point.