Lightguide with horizontal cutoff and horizontal spread

An automotive lightguide for a vehicle lamp, comprising:

• a plurality of main guide portions, each of said plurality of main guide portions having a base providing a light entrance surface, and a rear edge surface, each of said plurality of main guide portions having a maximum height (h1), said rear edge surface presenting a rear edge surface arcuate profile defining a non-parabolic continuous convex arcuate curve extending from i) a lowermost position of said rear edge surface at an end of said base to ii) a topmost end of said rear edge surface at said maximum height (h1) of each of said plurality of main guide portions, each of said plurality of main guide portions further comprising a first lateral side face and a second lateral side face that is generally parallel to said first lateral side face;
• and
• an exit lens joined to, integrally or monolithically formed with each of said plurality of main guide portions, said exit lens having an exit surface with an arcuate exit profile and a horizontal optical axis;
• at least one light source associated with each light entrance surface of each of said plurality of main guide portions, respectively;
• wherein, in use, light rays emitting from said at least one light source into said entrance surface is reflected off of said rear edge surface and travels through each of said plurality of main guide portions to said exit lens, said exit lens imaging the reflected light rays exiting via said exit surface of said exit lens as a light beam pattern with a predetermined overall top horizontal cutoff and a predetermined overall bottom horizontal cutoff, and
• wherein an exit profile of said exit lens is adapted to generate an overall horizontal spread of said light beam pattern having said predetermined overall top horizontal cutoff and said predetermined overall bottom horizontal cutoff;
• wherein said exit lens is joined to, integrally or monolithically formed with said plurality of main guide portions;
• at least a portion of each of said plurality of main guide portions defining a generally planar member having a cross-sectional thickness that is smaller than a thickness of said exit lens in cross-section;
• said lens having a longitudinal axis that is angled toward said light entry surface;
• wherein said light rays exiting said lens are substantially collimated in a horizontal plane and project horizontally to generate said predetermined overall top horizontal cutoff and said predetermined overall bottom horizontal cutoff relative to an optical axis.