Lighting unit for headlights

Abstract

The invention relates to a lighting unit (1) for a headlight, in particular a motor vehicle headlight, comprising a plurality of light sources (2), a light guide unit (3) with a plurality of light guides (30) and a rear projection lens (4), wherein each light guide (30) has a light outcoupling surface (30a) respectively, and wherein each light source (2) couples light into exactly the light guide (30) assigned to it, and wherein adjacent The light guides (30) are separated from each other by partition walls (31, 32). According to the invention it is provided that at least one diaphragm element (5) is arranged between the light guide unit (3) and the projection lens (4), said diaphragm elements (5) having diaphragm opening partitions (51, 52) separated from each other The diaphragm openings (50), wherein the diaphragm elements (5) are arranged such that the diaphragm openings (50) are respectively placed in front of the light outcoupling surface (30a), and wherein the diaphragm openings (50) are in the shape and in size substantially correspond to the light outcoupling surface ( 30 a ) respectively assigned thereto, and wherein at the surface ( 5 a ) of at least one diaphragm element ( 5 ) facing away from the light guide unit ( 3 ), the diaphragm opening partition At least some of the ( 51 , 52 ) have a smaller wall thickness (b) than the partition walls ( 31 , 32 ) of the light guide unit ( 3 ) that are assigned to the respective diaphragm opening partition walls ( 51 , 52 ).

Description

technical field [0001] The invention relates to a lighting unit for a headlight, in particular a motor vehicle headlight, comprising a plurality of light sources, a light guide unit with a plurality of light guides and a rear projection lens, wherein each light guide has a light outcoupling surface, and wherein Each light source couples light precisely into the light guide assigned to it, and adjacent light guides are separated from each other by a partition wall. [0002] Furthermore, the invention relates to a vehicle headlight for a motor vehicle having at least one such lighting unit. Background technique [0003] Light functions such as a high beam distribution or a low beam distribution from a plurality of partial light distributions can be produced with such a lighting unit. The partial light distribution can be controlled individually by individually controlling the light sources, so that, for example, parts of the light distribution can be blocked or dimmed in a ta...

AI Technical Summary

Problems solved by technology

[0008] However, in the case of "one-piece" production of light guide units with light guides built in them, the disadvantage arises that the wall thickness of the (partition) walls or (partition) plates between adjacent light guides has a significant effect on the light output of the light guides. In the region of the coupling surface there is a value which cannot be lowered in terms of manufacturing technology or can only be lowered with great effort in terms of manufacturing technology

But excessive wall thickness of the partition walls between the light guides leads to the formation of streaks in the light pattern, especially vertical and / or horizontal streaks

Images