Patent attributes
A lighting device for vehicles is provided, having a flat light guide containing two flat sides facing each other, one light input coupling surface for the entry of light at a light input coupling side of the flat light guide, one light output coupling surface for the output of light input at the light input coupling surface with the light output coupling surface arranged at one light output coupling side of the flat light guide. A specified light distribution (L) is thereby generated. The flat light guide further includes one narrow lateral surface connecting the flat sides with each other and extending from one lateral border of the light output coupling side, one collection surface adjacent to the light input coupling surface shaped in such a manner that a partial light beam of the entering light striking the collection surface is reflected in total towards the light output coupling surface without the partial light beam striking the narrow lateral surface. The light output coupling surface featuring a number of protrusions and depressions is alternately arranged transverse to the main beam direction (H), with the protrusions featuring at least two lateral slopes tapered at an acute angle (α) and a tip surface, that the tip surface is shaped in such a manner that a partial light beam which has been totally reflected from the collection surface and/or the flat sides and an additional partial light beam originating directly from the light input coupling surface are refracted at the tip surface to generate a central region (L1) of light distribution (L), that the lateral slope of the protrusion is shaped in such a manner that another partial light beam of the input light striking the lateral slope is totally reflected towards the tip surface and exits the flat light guide at the tip surface to generate a lateral region (L2, L3) of light distribution (L).
