Headlamp for vehicles having at least one laser light module

Patent metadata

Field	Value
Publication number	US-10480739-B2
Application number	US-201615780475-A
Country	US
Kind code	B2
Filing date	Dec 16, 2016
Priority date	Dec 22, 2015
Publication date	Nov 19, 2019
Grant date	Nov 19, 2019

Abstract

A headlamp ( 1 ) for vehicles having at least one laser light module ( 3 l, 3 m, 3 r ) which has a laser light source ( 11 ) and a phosphorus element ( 13 ) which is arranged downstream of the latter in the beam path and a front-end optical system ( 16 ) in which the at least one laser light module is arranged in a housing ( 2 ) of the headlamp which has a projection optical system ( 4 ) for projecting the light distribution generated in the focal plane of the projection optical system of the at least one laser light module into the carriageway space, and at least one deflection prism ( 20; 22, 23 ) is integrated into the at least one front-end optical system ( 16 ), which deflection prism ( 20; 22, 23 ) lies in the region of the laser beam ( 15; 15 - 1, 15 - 2 ) which occurs when the phosphorus element ( 13 ) is defective or missing and which deflects this laser beam occurring in the event of disruption and keeps it away from the projection optical system and therefore from the carriageway space.

First claim

The invention claimed is:

1. A headlight ( 1 ) for vehicles comprising:
at least one laser light module ( 3 l , 3 m , 3 r ) that includes a laser light source ( 11 ), and a phosphorus element ( 13 ) situated downstream therefrom in the beam path;
at least one optical attachment ( 16 ); and
at least one deflection prism ( 20 , 22 , 23 ) integrated into the at least one optical attachment ( 16 ),
wherein the at least one laser light module ( 3 l , 3 m , 3 r ) is situated in a housing ( 2 ) of the headlight ( 1 ), which has projection optics ( 4 ) configured for projecting the light distribution, generated in the focal plane of the projection optics of the at least one laser light module, into a roadway space, and
wherein the at least one deflection prism ( 20 ; 22 , 23 ) is configured to be situated in the area of laser radiation ( 15 ; 15 - 1 , 15 - 2 ) that passes through when the phosphorus element ( 13 ) is defective or missing, and to deflect this laser radiation that occurs in the event of a malfunction and keep it away from the projection optics ( 4 ) and thus, away from the roadway space, and
wherein the optical attachment ( 16 ) is configured as a total internal reflection (TIR) optics system, and the at least one deflection prism ( 20 ; 22 , 23 ) is formed by a recess on a front side of the optical attachment ( 16 ).

2. The headlight ( 1 ) according to claim 1 , wherein the optical axis of the optical attachment ( 16 ) differs from the direction of the generated laser beam, and when the phosphorus element ( 13 ) is defective or missing, the laser radiation is split into two partial beams ( 15 - 1 , 15 - 2 ), a deflection prism ( 22 , 23 ) being associated with each partial beam.

3. The headlight ( 1 ) according to claim 1 , wherein the light entry surface of the deflection prism ( 20 ; 22 , 23 ) is adapted to the cross section of the laser beam ( 15 ; 15 - 1 , 15 - 2 ) that arises in the event of a malfunction.

4. The headlight ( 1 ) according to claim 3 , wherein the at least one deflection prism ( 20 ; 22 , 23 ) is oriented with respect to a laser beam ( 15 ; 15 - 1 , 15 - 2 ), which arises in the event of a malfunction, in such a way that the deflection of the laser beam takes place in parallel to the shorter axis of the beam cross section.

5. The headlight ( 1 ) according to claim 1 , wherein a photosensor is situated in the housing ( 2 ) of the headlight ( 1 ) in the incidence area of the at least one laser beam ( 15 ; 15 - 1 , 15 - 2 ) that is deflected in the event of a malfunction, the photosensor being connected to a detection device that is configured for emitting a warning signal and/or switching off the at least one laser light source ( 11 ) in the event of a malfunction.

6. The headlight ( 1 ) according to claim 1 , wherein a radiation-absorbing means ( 6 ) is provided in the housing ( 2 ) of the headlight ( 1 ) in the incidence area of the at least one laser beam ( 15 ; 15 - 1 , 15 - 2 ) that is deflected in the event of a malfunction.

7. The headlight ( 1 ) according to claim 1 , comprising at least two of the laser light modules ( 3 l , 3 m , 3 r ), wherein the position of the optical axis of the optical attachment ( 16 ) in relation to the direction of the generated laser beam is different for the at least two laser light modules.

8. The headlight ( 1 ) according to claim 1 , comprising at least two of the laser light modules ( 3 l , 3 m , 3 r ), the laser light sources (11) of which are configured to generate a laser beam having an elliptical beam cross section, wherein the axial position of the elliptical beam cross section in relation to the optical main axis of the headlight is different for the at least two laser light modules.

9. The headlight ( 1 ) according to claim 1 , wherein the TIR optics ( 16 ) have a collimating design for laser radiation that occurs in the event of a malfunction, and a collimated interfering beam is directed away from the projection optics ( 4 ).

Assignees

• Zkw Group Gmbh

Inventors

• Danner Markus
• Riesenhuber Michael
• Reisinger Bettina
• Mayer Peter

Classifications

• F21S45/70

  Prevention of harmful light leakage · CPC title

• F21S41/14

  characterised by the type of light source · CPC title

• F21Y2115/30

  Semiconductor lasers · CPC title

• F21S41/29

  Attachment thereof (for achieving variable light distribution F21S41/63) · CPC title

• G02B27/126

  The splitting element being a prism or prismatic array, including systems based on total internal reflection · CPC title