Optical device for a lighting and/or signalling device of an automobile vehicle

A lighting and/or signaling device for a motor vehicle comprising:

• a reflector assembly;
• a lens;
• a housing;
• and
• an optical device, wherein the optical device comprises:
• a light guide having a light entry face and a light exit face disposed opposite to the light entry face;
• at least one collimator;
• at least one light source associated with each collimator;
• at least one optical coupler having at least two reflecting facets, wherein an optical coupler is configured to couple a collimator with the light guide at the light entry face of the light guide;
• wherein said collimator adapted to receive the light beam emitted by a light source and to collimate this beam, and directing the collimated light beam towards the two reflecting facets of the optical coupler, wherein at least part of collimated light beam from the reflecting facets enters the light guide and directed towards the light exit face along an optical axis of the light guide;
• and
• at least one aperture for diverting other part of the collimated light beam out of the light guide, wherein said at least one aperture is produced in the thickness of the light guide and situated at the light entry face of the light guide.