Indicator light comprising an optical piece fulfilling an indicating function autonomously

Indicator light, in particular for a motor vehicle, of the type comprising a central optical axis oriented from rear to front, a light source roughly at one point disposed on this optical axis, and a solid optical piece, at least partly of revolution about the optical axis, which is produced from a transparent material with a refractive index greater than that of air, and which is arranged at the front of the source, of the type in which the optical piece comprises at least:

• an input face whose generatrix lies in a direction substantially parallel to the optical axis;
• a rear reflection face whose generatrix lies in a direction substantially inclined towards the front;
• and a front exit face;
• so that the light flux emitted by the source and entering the optical piece through the inlet face is reflected on the rear reflection face, according to the principal of total reflection, and is returned towards the front exit face in a direction roughly parallel to the optical axis, with a view to fulfilling a given indicating function,
• wherein the exit face is formed by a series of elementary distribution dioptric elements, each of which is designed to form an elementary light beam whose image, on a screen placed in front of the indicator light, corresponds to the indicating function to be fulfilled.