Headlight module with cut-off, for a motor vehicle

An optical module of a headlight for a motor vehicle, for giving a cut-off beam, defining an optical axis and comprising at least the following:

• either a first reflector and a light source, a cover piece, optionally a deflector, and a convergent lens;
• or else a reflector with a complex surface associated with a light source, wherein said module further includes:
• a second reflector which is situated below the horizontal plane that passes through the optical axis, said second reflector defining a meridian curve which comprises the following:
• an elliptical arc;
• and a curve situated in front of the end of the elliptical arc, the front end of this curve being coincident with the second focus of the said elliptical arc, or close to the said focus;
• and
• together with a lens which surrounds at least one zone of the lower portion of the convergent lens, or, in the absence of any convergent lens, which surrounds the zone through which the rays pass in the plane of said lens,
• a cross section of said lens, taken through a plane which giving two curves corresponding respectively to the input face and the output face of the lens, said curves themselves corresponding to the cross section of a convergent lens taken through a plane passing through its optical axis.