Patent ID: 7104678

Claim:
A lighting or signaling device, in particular for a motor vehicle, which comprises: (a) a light guide comprising an elongated body and a pair of opposite end faces, at least one portion of light guide having a roughly circular vertical transverse elementary section along a director line, the contour of the elementary section comprising a front peripheral lighting portion and a rear peripheral portion which comprises a rear light-diffusion segment, the elementary section comprising a principal optical axis with a transverse direction which extends from rear to front from the rear light-diffusion segment as far as the front peripheral lighting portion; (b) a light source emitting light rays which enter the light guide through at least one end face so as to be channeled by the light guide whereby the channeled light rays propagate in the light guide by successive total reflections in the general direction of the director line, and in which the channeled light rays reaching the rear light-diffusion segment are diffused, the rays diffused towards the rear emerging outside the length, and the rays diffused towards the inside of the guide included in a given solid angle around the principal optical axis being refracted through the front peripheral lighting portion of the length; and (c) a rear reflector situated opposite the rear light-diffusion segment along the principal optical axis which reflects towards the inside of the elementary section the rays diffused towards the rear so that they are refracted through the front peripheral lighting portion.