Lighting unit and motor vehicle lighting device with such a lighting unit
The invention relates to a lighting unit for use in conjunction with a light module of a motor vehicle lighting device. The light module is designed to produce a dimmed light distribution with a substantially horizontal cut-off line. The lighting unit has a light source that can be switched independently from the light module and an optical assembly that is assigned to the light source and is designed to deflect light emitted by the light source and to generate overhead lighting with a defined level of illumination which is spatially limited at least towards an oncoming traffic side in an overhead area above the cut-off line of the dimmed light distribution.
1 . A lighting unit for use together with a light module of a motor vehicle lighting device, wherein the light module is designed to produce a dimmed light distribution with a substantially horizontal cut-off line, said lighting unit comprising:
a light source that can be switched independently from the light module and an optical assembly associated with the light source, said optical assembly designed to deflect light emitted by the light source of the lighting unit to produce an overhead illumination with a defined illumination level which is spatially limited at least towards an oncoming traffic side in an overhead area above the cut-off line of the dimmed light distribution;
wherein the optical assembly illuminates, with the overhead lighting, a measuring area in the overhead area where a minimum luminous intensity is required, so that the requirements for the minimum luminous intensity in the overhead area of the dimmed light distribution are fulfilled; and
wherein the measuring area includes measuring points for minimum luminous intensities 2 U 4 L; 1.5 U 1 R to 3 R required by standard according to Federal Motor Vehicle Safety Standards No. 108 “Low Beam” in the version in force on the priority date of the present application.
2 . The lighting unit as set forth in claim 1 , wherein the light source of the lighting unit is designed to be activated at least whenever the light module produces the dimmed light distribution.
3 . The lighting unit as set forth in claim 1 , wherein the optical assembly is designed to omit, with the overhead illumination, a glare area on the oncoming traffic side of the dimmed light distribution, in particular in a region of −8° to −20° horizontally.
4 . The lighting unit as set forth in claim 3 , wherein the optical assembly is designed to omit, with the overhead lighting, measuring points 0.5 U 1 R to 3 R in accordance with Federal Motor Vehicle Safety Standards No. 108 “Low Beam” in the version in force on the priority date of the present application or to illuminate these measuring points only with low luminous intensity.
5 . The lighting unit as set forth in claim 1 , wherein the optical assembly is designed to omit, with the overhead lighting, measuring points 0.5 U 1 R to 3 R in accordance with Federal Motor Vehicle Safety Standards No. 108 “Low Beam” in the version in force on the priority date of the present application or to illuminate these measuring points only with low luminous intensity.
6 . The lighting unit as set forth in claim 1 , wherein the optical assembly comprises a lens system with at least one lens or a reflection system with at least one reflector or a diffusing optics.
7 . A motor vehicle lighting device comprising:
a housing and a light module arranged therein for producing a dimmed light distribution with a substantially horizontal cut-off line,
an additional lighting unit arranged in the housing, with a light source that can be switched independently from the light module and an optical assembly associated with the light source, which is designed to deflect light from the light source of the additional lighting unit to produce an overhead illumination with a defined level of illumination, which is spatially limited at least towards an oncoming traffic side, in an overhead region above the cut-off line of the dimmed light distribution;
wherein the optical assembly illuminates, with the overhead lighting, a measuring area in the overhead area where a minimum luminous intensity is required, so that the requirements for the minimum luminous intensity in the overhead area of the dimmed light distribution are fulfilled; and
wherein the measuring area includes measuring points for minimum luminous intensities 2 U 4 L; 1.5 U 1 R to 3 R required by standard according to Federal Motor Vehicle Safety Standards No. 108 “Low Beam” in the version in force on the priority date of the present application.
8 . The motor vehicle lighting device as set forth in claim 7 , wherein the light source of the lighting unit is designed to be activated at least whenever the light module produces the dimmed light distribution.
9 . The motor vehicle lighting device as set forth in claim 7 , wherein the additional lighting unit is rigidly coupled to the light module and is movable therewith in respect to the housing of the motor vehicle lighting device.
10 . The motor vehicle lighting device as set forth in claim 7 , wherein the light module is designed to produce an adaptive driving beam which includes a glare-free high beam, and wherein the light source of the additional lighting unit is designed to be activated at least whenever the light module, in the course of generating the glare-free high beam, shades at least part of the overhead area.
11 . The motor vehicle lighting device as set forth in claim 10 , wherein the light module is in the form of a digital projector, a DMD-module or a micro-LED-module.
12 . The motor vehicle lighting device as set forth in claim 7 , wherein the additional lighting unit is designed to illuminate, with the overhead lighting, a measuring area in the overhead area where a minimum luminous intensity is required, so that the requirements for the minimum luminous intensity in the overhead area of the dimmed light distribution are fulfilled.
13 . The motor vehicle lighting device as set forth in claim 7 , wherein the additional lighting unit is designed such that the measuring area includes measuring points for minimum luminous intensities 2 U 4 L; 1.5 U 1 R to 3 R required by standard according to Federal Motor Vehicle Safety Standards No. 108 “Low Beam” in the version in force on the priority date of the present application.
14 . The motor vehicle lighting device as set forth in claim 7 , wherein the optical assembly is designed to omit, with the overhead illumination, a glare area on the oncoming traffic side of the dimmed light distribution, in particular in a region of −8° to −20° horizontally.
15 . The motor vehicle lighting device as set forth in claim 7 , wherein the optical assembly is designed to omit, with the overhead lighting, measuring points 0.5 U 1 R to 3 R in accordance with FMVSS No. 108 “Low Beam” in the version in force on the priority date of the present application or to illuminate these measuring points only with low luminous intensity.