Lighting device for a motor vehicle headlight

Patent metadata

Field	Value
Publication number	US-12253228-B2
Application number	US-202218578548-A
Country	US
Kind code	B2
Filing date	Jun 20, 2022
Priority date	Jul 20, 2021
Publication date	Mar 18, 2025
Grant date	Mar 18, 2025

Abstract

Illumination device ( 10 ) for a motor vehicle headlight for producing segmented full beam distribution (FL), wherein the illumination device ( 10 ) comprises the following for this purpose:
an optical element ( 100 ), comprising light guiding bodies ( 200 ) for forming the definable segment full beam distribution (FL), which light guiding bodies ( 200 ) respectively have a light entry surface ( 210 ) and an exit surface ( 220 ), projection optics ( 300 ) arranged downstream of the beam path of the optical element ( 100 ) having an optical axis (A), which projection optics ( 300 ) are designed to project the light exiting from the common exit surface ( 200 a ) in front of the illumination device ( 10 ) in the direction of a main emission direction (X), and wherein each light guiding body ( 200 ) has two lateral side surfaces ( 230 a, 230 b ) and an upper and a lower side surface ( 240 a, 240 b ), wherein the optical element ( 100 ) has a first and a second light emission half (L 1 , L 2 ), which can be delimited from one another by a virtual vertical plane (VE), wherein the first light guiding body ( 200 a ) of the first light emission half (L 1 ) helps produce the first maximum illuminance (M 1 ), and wherein the first light guiding body ( 200 b ) of the second light emission half (L 2 ) helps produce the second maximum illuminance (M 2 ), wherein the surface centre (FM 2 ) of the entry surface ( 210 ) has a horizontal offset (H-off) and a downwards vertical offset (V-off) to the surface centre (FM 1 ) of the associated exit surface ( 220 ), and wherein the lateral side surface ( 230 a ) of these first light guiding bodies ( 200 a, 200 b ), which faces away from the virtual vertical plane (VE), is convex and combined with the offset of the entry surfaces ( 210 ) is designed to direct light from the corresponding light source ( 50 ) in the direction of the optical axis (A) in order to increase the illuminance between the first and the second maximum illuminance (M 1 , M 2 ) in the full beam distribution (FL) such that the intersection HV of an aiming screen is arranged within the isolux line for 80% of the maximum illuminance of the full beam distribution (FL).

First claim

The invention claimed is:

1. An illumination device ( 10 ) for a motor vehicle headlight for producing segmented full beam distribution (FL), wherein the full beam distribution (FL) has a first and a second maximum illuminance (M 1 , M 2 ), which are designed and arranged in the full beam distribution (FL) in such a way that an intersection HV of the horizontal line H-H and the vertical line V-V of an aiming screen for measuring a light distribution is arranged within an isolux line for 80% of the maximum illuminance of the full beam distribution (FL), wherein the illumination device ( 10 ) comprises:
a plurality of light sources ( 50 );
an optical element ( 100 ), comprising a base body ( 110 ) and a plurality of light guiding bodies ( 200 ) protruding from the base body ( 110 ) for forming the segmented full beam distribution (FL) from the light of the plurality of light sources ( 50 ), which light guiding bodies ( 200 ) respectively have a light entry surface ( 210 ), into which light can be fed from the light sources ( 50 ), wherein at least one light source of the plurality of light sources ( 50 ) is respectively associated with the entry surface ( 210 ), and an exit surface ( 220 ), from which exit surface ( 220 ) light that can be fed into the respective light guiding body ( 200 ) exits, wherein the exit surfaces ( 220 ) of adjacent light guiding bodies ( 200 ) are directly adjacent to one another and form a common exit surface ( 220 a ) of the optical element ( 100 ), wherein the light guiding bodies ( 200 ) of the optical element ( 100 ) are arranged in at least one row along a straight line (G); and
projection optics ( 300 ) arranged downstream of the beam path of the optical element ( 100 ) having an optical axis (A), which projection optics ( 300 ) are designed to project the light exiting from the common exit surface ( 200 a ) in front of the illumination device ( 10 ) in the direction of a main emission direction (X), wherein the optical axis (A) of the projection optics ( 300 ) intersects the intersection HV, and wherein the optical axis (A) is parallel to the main emission direction (X) of the illumination device ( 10 ),
wherein a first and second virtual axis (y, z) are arranged orthogonally to the main emission direction (X), wherein the first and second virtual axis (y, z) are also aligned orthogonally to one another, wherein the illumination device ( 10 ) is configured to be installed in a motor vehicle headlight such that the first axis (y) is arranged in a horizontal plane and the second axis (z) is arranged in a vertical plane,
wherein when the illumination device ( 10 ) is installed in the motor vehicle headlight, each light guiding body ( 200 ) has two lateral side surfaces ( 230 a , 230 b ) and an upper and a lower side surface ( 240 a , 240 b ), which side surfaces ( 230 a , 230 b , 240 a , 240 b ) extend from the entry surface ( 210 ) in the direction of the common exit surface ( 220 a ) and delimit the light guiding body ( 200 ) at least in sections,
wherein the optical element ( 100 ) has a first and a second light emission half (L 1 , L 2 ), which, when the illumination device ( 10 ) is installed in the motor vehicle headlight, can be delimited from one another by a virtual vertical plane (VE), which runs through the optical element ( 100 ) and in which vertical plane (VE) the optical axis (A) of the projection optics ( 300 ) lies, wherein the first light emission half (L 1 ) is arranged on a first side (S 1 ) of the virtual vertical plane (VE), and wherein the second light emission half (L 2 ) is arranged on a second side (S 2 ) opposite the first side (S 1 ),
wherein a first light guiding body ( 200 a ) of the first light emission half (L 1 ), which is directly adjacent to the virtual vertical plane (VE), produces the first maximum illuminance (M 1 ) of the full beam distribution (FL),
wherein a first light guiding body ( 200 b ) of the second light emission half (L 2 ), which is directly adjacent to the virtual vertical plane (VE), produces the second maximum illuminance (M 2 ) of the full beam distribution (FL),
wherein the entry surfaces ( 210 ) of these first light guiding bodies ( 200 a , 200 b ) respectively have an offset from the corresponding exit surface ( 220 ) such that the surface centre (FM 2 ) of the entry surface ( 210 ) has a horizontal offset (H-off), directed away from the virtual vertical plane (VE), along the first axis (y), which runs orthogonally to the virtual vertical plane (VE), and a downwards vertical offset (V-off) along the second axis (z) to the surface centre (FM 1 ) of the associated exit surface ( 220 ), and
wherein the lateral side surface ( 230 a ) of these first light guiding bodies ( 200 a , 200 b ), which faces away from the virtual vertical plane (VE), is convex and combined with the offset of the entry surfaces ( 210 ) is designed to direct light from the corresponding light source ( 50 ) in the direction of the optical axis (A) in order to increase the illuminance between the first and the second maximum illuminance (M 1 , M 2 ) in the full beam distribution (FL) such that the intersection HV of an aiming screen is arranged within the isolux line for 80% of the maximum illuminance of the full beam distribution (FL).

2. The illumination device according to claim 1 , wherein the lateral side surface ( 230 b ) of these first light guiding bodies ( 200 a , 200 b ) that is directed towards the virtual vertical plane (VE) is concave.

3. The illumination device according to claim 1 , wherein the upper side surface ( 240 a ) of these first light guiding bodies ( 200 a , 200 b ) is curved.

4. The illumination device according to claim 3 , wherein the upper side surface ( 240 a ) of these first light guiding bodies ( 200 a , 200 b ) is concave.

5. The illumination device according to claim 1 , wherein the lower side surface ( 240 b ) of these first light guiding bodies ( 200 a , 200 b ) is curved.

6. The illumination device according to claim 5 , wherein the lower side surface ( 240 b ) of these first light guiding bodies ( 200 a , 200 b ) is convex.

7. The illumination device according to claim 1 , wherein the entry surfaces ( 210 ) of the light guiding bodies ( 200 ) are arranged in a common vertical plane, which vertical plane is arranged orthogonal to the main emission direction (X).

8. The illumination device according to claim 1 , wherein the plurality of light sources ( 50 ) are designed as light-emitting diodes.

9. The illumination device according to claim 8 , wherein the light-emitting diodes can be controlled independently of one another.

10. The illumination device according to claim 9 , wherein the light-emitting diodes can be switched on and off independently of one another.

11. The illumination device according to claim 9 , wherein the light-emitting diodes can be dimmed independently of one another.

12. The illumination device according to claim 1 , wherein the light guiding bodies ( 200 ) of the optical element ( 100 ) are arranged in exactly one row along a straight line (G).

13. A motor vehicle headlight having at least one illumination device in accordance with claim 1 .

Assignees

• Zkw Group Gmbh

Inventors

• Galander Ulrich
• Pühringer Jakob
• Krist Benedikt

Classifications

• F21S41/68

  by acting on screens · CPC title

• F21W2102/145

  wherein the light is emitted between two parallel vertical cutoff lines, e.g. selectively emitted rectangular-shaped high beam · CPC title

• F21S41/255

  Lenses with a front view of circular or truncated circular outline · CPC title

• F21S41/143 Primary

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

• F21S41/663

  by switching light sources (by switching incandescent light sources F21S41/162) · CPC title