Lighting unit with light guide rods for headlights

Abstract

The invention relates to a lighting unit (1) for a headlight, in particular for a motor vehicle headlight, wherein the lighting unit (1) comprises a plurality of light sources (2), a light guiding unit (3) and a downstream projection a lens (4), wherein the light guide unit (3) has a plurality of light guides (30), wherein each light guide (30) has a light output surface (30a) and a light input surface (30b), respectively, In addition, each light source ( 2 ) feeds light through a corresponding light input surface ( 30 b ) exactly into the light guide ( 30 ) assigned to it. According to the invention, a light guiding rod (10) is arranged between the light source (2) and the light input surface (30b) of the light guide (30), the light guiding rods (10) form at least one light guiding rod group (100), And wherein each light source (2) basically only inputs light into the light guide rod input position (10a) of the light guide rod (10) assigned to the corresponding light source (2), and wherein the slave light guide rod of the associated light source (2) The light exiting from the output position ( 10 b ) is substantially only fed into the light input surface ( 30 b ) of the light guide ( 30 ) assigned to the respective light source ( 2 ).

Description

Technical field [0001] The present invention relates to a light-emitting unit for headlights, especially for motor vehicle headlights, wherein the light-emitting unit includes a plurality of light sources, a light guide unit and a projection lens connected to the rear, wherein the light guide unit has A plurality of light guides, wherein each light guide has a light output surface and a light incident surface respectively, and wherein each light source just inputs light into the light guide assigned to it through a corresponding light incident surface. [0002] Furthermore, the invention relates to a vehicle headlight for a motor vehicle with at least one such lighting unit. Background technique [0003] With the above-mentioned light emitting unit, a light function such as a low beam distribution or a high beam distribution can be formed from a large number of partial light distributions. This partial light distribution can be triggered separately by a separate trigger light sour...

AI Technical Summary

Problems solved by technology

[0013] If the light source, i.e. the LED light source, is positioned at a sufficiently large distance from the light input position of the light guide, a strong undesired loss of efficiency of the light source results

[0014] The use of silicon material for the light guiding unit results in a significantly thermally more stable light guiding unit, but must also be manufactured with a shelf, usually made of synthetic material, so that reproduces the problems described above and can lead to damage or destruction of the shelf

[0015]The positioning of a simple light-transmitting glass plate between the light source and the light-guiding unit causes thermal separation, but leads to interference between the individual light-guiding elements, That is to say, the light source feeds the light emitted by it not only into exactly one associated light guide, but also into other light guides, so that when a specific light source is activated, not only one light segment illuminates the area in front of the vehicle as desired. area, but multiple light segments are formed in the imaging, which is undesirable

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