Projection module for a motor vehicle headlamp

Patent metadata

Field	Value
Publication number	US-11629834-B2
Application number	US-202017781472-A
Country	US
Kind code	B2
Filing date	Nov 16, 2020
Priority date	Dec 20, 2019
Publication date	Apr 18, 2023
Grant date	Apr 18, 2023

Abstract

A projection module ( 10 ) for a motor vehicle headlamp, comprising a first light source ( 110 ) and a second light source ( 120 ), a beam stop ( 200 ), which is horizontally arranged, and which comprises an optically relevant stop edge ( 210 ) for creating an asymmetric light-dark boundary, wherein the first light source ( 110 ) is arranged on a top side of the beam stop ( 200 ) and, in combination with the stop edge ( 210 ), contributes to the creation of a low beam distribution, and wherein the second light source ( 120 ) is arranged on a bottom side of the beam stop ( 200 ) and contributes to the creation of a high beam distribution, and a projection lens ( 300 ), wherein the projection module ( 10 ) comprises an auxiliary stop ( 400 ), which is vertically arranged below the beam stop ( 200 ), and which has a vertically extending first optically relevant stop edge ( 410 ), which is configured to partially shade light from the second light source ( 120 ), so that a partial high beam distribution can be created, and wherein the auxiliary stop ( 400 ) has a fastening section ( 430 ), wherein, in the vertical extension in the direction of the beam stop ( 200 ), the first stop edge ( 410 ) has an end ( 411 ), which end ( 411 ) has a distance from the beam stop ( 200 ), and wherein the auxiliary stop ( 400 ) has a second optically relevant stop edge ( 420 ), which, starting at the end ( 411 ) of the first stop edge ( 410 ), extends all the way to the fastening section ( 430 ), wherein, in a projection onto the beam stop ( 200 ), the second stop edge ( 420 ) defines a gap, which gap, in combination with the second light source ( 120 ), is configured to create a segment ( 500 ) in the partial high beam distribution.

First claim

The invention claimed is:

1. A projection module ( 10 ) for a motor vehicle headlamp, the projection module ( 10 ) comprising:
a first light source ( 110 ) and a second light source ( 120 );
a beam stop ( 200 ), which is configured to be horizontally arranged in the case of a use of the projection module ( 10 ) as intended in an installed motor vehicle headlamp, and which comprises an optically relevant stop edge ( 210 ) for creating an asymmetric light-dark boundary, wherein the first light source ( 110 ) is arranged on a top side of the beam stop ( 200 ) and, in combination with the optically relevant stop edge ( 210 ) of the beam stop ( 200 ), contributes to the creation of a low beam distribution, and wherein the second light source ( 120 ) is arranged on a bottom side of the beam stop ( 200 ) and contributes to the creation of a high beam distribution; and
at least one projection lens ( 300 ) comprising an optical axis (A) and a focus area (F) for projecting a light distribution in a main direction of beam (X) in front of the projection module ( 10 ), wherein the stop edge ( 210 ) of the beam stop ( 200 ) for creating a sharp light-dark boundary is essentially arranged in the focus area (F) of the projection lens ( 300 ), and wherein the optical axis (A) coincides with the main direction of beam (X),
wherein the projection module ( 10 ) comprises an auxiliary stop ( 400 ), which is configured to be vertically arranged below the beam stop ( 200 ) in the case of a use of the projection module ( 10 ) as intended in a motor vehicle headlamp, and which has a vertically extending first optically relevant stop edge ( 410 ), which is arranged spaced apart from the optical axis (A), wherein the first optically relevant stop edge ( 410 ) is configured to partially shade light from the second light source ( 120 ), so that a partial high beam distribution can be created, and
wherein the auxiliary stop ( 400 ) has a bearing section ( 430 ), on which the auxiliary stop ( 400 ) bears against the beam stop ( 200 ), wherein, in the vertical extension in the direction of the beam stop ( 200 ), the first optically relevant stop edge ( 410 ) has an end ( 411 ), which end ( 411 ) has a distance from the beam stop ( 200 ), and wherein the auxiliary stop ( 400 ) has a second optically relevant stop edge ( 420 ), which, starting at the end ( 411 ) of the first optically relevant stop edge ( 410 ), extends all the way to the bearing section ( 430 ), wherein, in the vertical direction to the beam stop ( 200 ), a distance of the second optically relevant stop edge ( 420 ) defines a gap, which gap, in combination with the second light source ( 120 ), is configured to create a segment ( 500 ) in the partial high beam distribution.

2. The projection module according to claim 1 , wherein the first optically relevant stop edge ( 410 ) of the auxiliary stop ( 400 ) is configured to horizontally shade the high beam distribution, which can be created, at −5° to −1°, on an aiming screen.

3. The projection module according to claim 2 , wherein the aiming screen is arranged at a distance of 25 m from the projection module.

4. The projection module according to claim 2 , wherein the first optically relevant stop edge ( 410 ) of the auxiliary stop ( 400 ) is configured to horizontally shade the high beam distribution at −3.5° on an aiming screen.

5. The projection module according to claim 2 , wherein the gap is configured to create a segment ( 500 ) in the partial high beam distribution, which segment ( 500 ) extends horizontally from −2° up to maximally −12°, and which extends vertically up to 2°, on an aiming screen.

6. The projection module according to claim 1 , wherein the gap is configured to create a segment ( 500 ) in the partial high beam distribution, which segment ( 500 ) extends horizontally from −2° up to maximally −12°, and which extends vertically up to 2° on an aiming screen.

7. The projection module according to claim 1 , wherein the beam stop ( 200 ) and the auxiliary stop ( 400 ) form an inherently rigid composite stop.

8. The projection module according to claim 1 , wherein the focus area (F) of the projection lens ( 300 ) is curved, wherein the course of the optically relevant stop edge ( 210 ) of the beam stop ( 200 ) essentially follows the curved focus area (F).

9. The projection module according to claim 1 , wherein the auxiliary stop ( 400 ) is arranged orthogonally onto the optical axis (A) of the projection lens ( 300 ).

10. The projection module according to claim 1 , wherein the first optically relevant stop edge ( 410 ) of the auxiliary stop ( 400 ) is spaced apart in the direction of the optical axis (A) of the projection lens ( 300 ), wherein the distance ( 440 ) is 1 mm.

11. The projection module according to claim 1 , wherein the auxiliary stop ( 400 ) has at least one hole for a signlight light distribution.

12. The projection module according to claim 1 , wherein the bearing section ( 430 ) is formed as fastening section, on which the auxiliary stop ( 400 ) is fastened to the beam stop ( 200 ).

13. The projection module according to claim 1 , wherein the gap is configured to create a segment ( 500 ) in the partial high beam distribution, which segment ( 500 ) extends horizontally from −2° up to maximally −6°, and which extends vertically up to 2°, on an aiming screen.

14. The projection module according to claim 1 , wherein the gap is configured to create a segment ( 500 ) in the partial high beam distribution, which segment ( 500 ) extends horizontally from −2° up to maximally −5°, and which extends vertically up to 2°, on an aiming screen.

15. The projection module according to claim 1 , wherein the gap is configured to create a segment ( 500 ) in the partial high beam distribution, which segment ( 500 ) extends horizontally from −2° up to maximally −12°, and which extends vertically up to 1°, on an aiming screen.

16. The projection module according to claim 1 , wherein the gap is configured to create a segment ( 500 ) in the partial high beam distribution, which segment ( 500 ) extends horizontally from −2° up to maximally −12°, and which extends vertically up to 0.2°, on an aiming screen.

17. The projection module according to claim 1 , wherein the gap is configured to create a segment ( 500 ) in the partial high beam distribution, which segment ( 500 ) extends horizontally from −2° up to maximally −6°, and which extends vertically up to 1°, on an aiming screen.

18. The projection module according to claim 1 , wherein the gap is configured to create a segment ( 500 ) in the partial high beam distribution, which segment ( 500 ) extends horizontally from −2° up to maximally −6°, and which extends vertically up to 0.2°, on an aiming screen.

19. The projection module according to claim 1 , wherein the gap is configured to create a segment ( 500 ) in the partial high beam distribution, which segment ( 500 ) extends horizontally from −2° up to maximally −5°, and which extends vertically up to 0.2°, on an aiming screen.

20. The projection module according to claim 1 , wherein the first optically relevant stop edge ( 410 ) of the auxiliary stop ( 400 ) is spaced apart in the direction of the optical axis (A) of the projection lens ( 300 ), wherein the distance ( 440 ) is 8/10 mm.

Assignees

• Zkw Group Gmbh

Inventors

• Mandl Bernhard
• Karas Tobias

Classifications

• F21W2102/15

  wherein the light is emitted under L-shaped cut-off lines, i.e. vertical and horizontal cutoff lines · CPC title

• F21S41/26 Primary

  Elongated lenses · CPC title

• F21S41/147

  the main emission direction of the LED being angled to the optical axis of the illuminating device · CPC title

• F21S41/43 Primary

  characterised by the shape thereof · CPC title

• F21S41/25

  Projection lenses · CPC title