Headlamp for vehicles

Patent metadata

Field	Value
Publication number	US-9719646-B2
Application number	US-201414906780-A
Country	US
Kind code	B2
Filing date	Jul 24, 2014
Priority date	Aug 2, 2013
Publication date	Aug 1, 2017
Grant date	Aug 1, 2017

Abstract

A headlamp for vehicles having a projection module containing a first light source for generating a first light bundle, a reflector assigned to the first light source, a lens, and an edge disposed in a focal plane for generating a low beam light distribution. The headlamp also includes a second light source for generating a second light bundle and an optics unit disposed between the lens and the second light source for generating a supplementary light distribution, such that by superimposing the supplementary light distribution and the low beam light distribution, a high beam light distribution is formed. The optics unit is formed by a flat waveguide having a light entry surface for receiving the second light bundle emitted from the second light source. The second light source is disposed in the proximity of the light entry surface, having a light exit surface, and flat sides extending between the light entry surface and the light exit surface, on which entering light can be conducted through total reflection. A light/dark border of the low beam light distribution is formed by the edge of the flat waveguide formed as the front outer edge, which connects the light exit surface and an upper flat side of the waveguide. The upper flat side of the flat waveguide is provided with a light blocking coating, such that an entry of light beams from the first light bundle striking the upper flat side is prevented.

First claim

The invention claimed is:

1. A headlamp for vehicles comprising:
a projection module containing:
a first light source for generating a first light bundle,
a reflector assigned to the first light source,
a lens,
an edge disposed in a focal plane for generating a low beam light distribution;
a second light source for generating a second light bundle and
an optics unit disposed between the lens and the second light source for generating a supplementary light distribution, such that by superimposing the supplementary light distribution and the low beam light distribution, a high beam light distribution is formed,

wherein the optics unit is formed by a flat waveguide having a light entry surface for receiving the second light bundle emitted from the second light source,
wherein the second light source is disposed in the proximity of the light entry surface, having a light exit surface, and flat sides extending between the light entry surface and the light exit surface, on which entering light can be conducted through total reflection,
wherein a light/dark border of the low beam light distribution is formed by the edge of the flat waveguide formed as the front outer edge, which connects the light exit surface and an upper flat side of the waveguide, and
wherein the upper flat side of the flat waveguide is provided with a light blocking coating, such that an entry of light beams from the first light bundle striking the upper flat side is prevented.

2. The headlamp according to claim 1 , wherein the light blocking coating extends over the surface of the upper flat side of the flat waveguide in a laminar manner, wherein an edge of the light blocking coating is disposed at a given distance (a) to the front outer edge of the upper flat side.

3. The headlamp according to claim 1 wherein the light blocking coating is applied to the upper flat side of the waveguide through sputtering.

4. The headlamp according to claim 1 wherein the light blocking coating is applied to the upper flat side of the flat waveguide through a metallic sputtering.

5. The headlamp according to claim 1 wherein at the flat waveguide is snapped securely in place in a frame-shaped mount.

6. The headlamp according to claim 5 , wherein the mount has fasteners for connecting the same to the reflector.

7. The headlamp according to claim 1 wherein the front edge side has a number of line segments.

8. The headlamp according to claim 7 , characterized in that wherein the line segments, are straight, wherein a line segment running at a diagonal to the adjacent line segments runs at a diagonal to form a 15° rise in an asymmetrical low beam light distribution.

9. The headlamp according to claim 1 wherein the first light source and the second light source are each designed as a semiconductor light source.

10. The headlamp according to claim 1 wherein the second light source is positioned in the immediate proximity of the light entry surface of the flat waveguide.

Assignees

• Hella Kgaa Hueck & Co

Inventors

• Fedosik Dmitry
• Giepen Bernd
• Knoche Matthias
• Letzin Ronny
• Spiekermann Ralf

Classifications

• F21S41/24

  Light guides · CPC title

• F21S41/43

  characterised by the shape thereof · CPC title

• F21S41/37

  characterised by their material, surface treatment or coatings · CPC title

• F21S48/115

  Mechanical Engineering · mapped topic

• F21S48/1154

  Mechanical Engineering · mapped topic