Lighting device for motor vehicle, in particular headlight for motor vehicle

Abstract

The invention relates to a lighting device for a motor vehicle, in particular a headlight for a motor vehicle, comprising at least one first light source (1); at least one primary optical system (2) and at least one secondary optical system (3), light emitted from the at least one first light source passing through the at least one primary optical system and the at least one secondary optical system to produce at least one first portion of a primary light function; a second light source (4) having a plurality of semiconductor elements, the light exit surfaces of which are arranged in a matrix for the targeted generation of pixels of a light distribution of at least one second part of the primary light function; and a projection optical system (5) that projects the light emitted from the second light source into the exterior of the motor vehicle; a common exit surface (11) for the light of the at least one first portion for generating the main light function and for the light of the at least one second portion for generating the main light function.

Description

TECHNICAL FIELD

[0001] The invention relates to a lighting device for a motor vehicle, in particular for a headlight of a motor vehicle. BACKGROUND

[0002] A light module for a headlight of a motor vehicle and a headlight having such a light module are known from DE 102017105888 A1. The light module comprises a light emission unit having a plurality of point-like light sources arranged in a matrix and a projection optical system having at least one projection lens, which projects the light emitted by the light emission unit as a generated light distribution of the light module onto a roadway in front of the motor vehicle. The light emission unit can be configured as a matrix LED module. Since the light emitting area of the matrix LED module is imaged directly into the traffic space, a desired light distribution, for example a glare-free high beam (ADB), has already been able to be realized without having to manipulate the light image by means of a primary optical system.

[0003] Another lighting device configured as a headlight for a motor vehicle is known from DE 102021122953 B3. The lighting device described therein comprises a plurality of light sources from which light is emitted in the operation of the lighting device, a collimation optical system serving as a primary optical system having a plurality of collimation lenses each having an entrance face and an exit face through which the light emitted from the light sources passes, and a secondary optical system having a plurality of cylindrical lens arrays, wherein the light emitted from the collimation optical system passes through the cylindrical lens arrays. By means of the module disclosed in DE 102021122953 B3 different main light functions can be generated, such as a high beam, a front field portion of a low beam and a range portion of a low beam.

[0004] It is currently desirable in a headlight to realize a solution which, despite the generation of different main light functions, still meets the so-called One-Eye-Design. This means that the light of the different main light functions exits from only one exit face. If in a headlight a matrix LED module for generating a glare-free high beam is to be used and at the same time the One-Eye-Design is desired, this can at most be achieved by a matrix LED module having only a few dozen light emitting diodes, in particular significantly less than 48 light emitting diodes. By using a plurality of separate main light modules, the number of matrix segments can be increased. But thereby the One-Eye-Design can no longer be guaranteed. SUMMARY

[0005] The problem underlying the invention is to provide a lighting device of the type mentioned at the outset which can generate a plurality of different main light functions, has a One-Eye-Design and has a light source with a plurality of matrix-arranged semiconductor elements.

[0006] According to the application, this is achieved by a lighting device of the type mentioned in the opening paragraph having the features of claim 1. The dependent claims relate to preferred design solutions of the application.

[0007] According to claim 1, the lighting device comprises:

[0008] - at least one first light source,

[0009] - at least one primary optical system,

[0010] - at least one secondary optical system, wherein the lighting device is designed such that light emitted from the at least one first light source passes through the at least one primary optical system and through the at least one secondary optical system to produce at least one first portion of a main light function,

[0011] - a second light source having a plurality of semiconductor elements, which have a light exit face each, wherein the light exit faces of the semiconductor elements are arranged in a matrix for the targeted production of pixels of a light distribution of at least one second portion of the main light function,

[0012] - a projection optical system designed to project light emitted from the second light source into the exterior space of the motor vehicle,

[0013] - a common exit face for the light for the at least one first portion of the main light function and for the light for the at least one second portion of the main light function.

[0014] Here, the lighting device can comprise a coupling-out optical system, on which the common exit face for the light for the at least one first portion of the main light function and for the light for the at least one second portion of the main light function is configured. Thereby, a lighting device is provided which can produce a plurality of different main light functions, has a monocle design and a light source with a plurality of semiconductor elements arranged in a matrix.

[0015] It can be provided that the semiconductor elements of the second light source are configured as light-emitting diodes and are designed to be controlled independently of one another to produce pixels of the light distribution, in particular wherein the second light source is configured as a solid-state LED array, wherein the solid-state LED array has, for example, 48 light-emitting diodes or more than 48 light-emitting diodes. Despite these large numbers of light-emitting diodes, the lighting device still has a monocle design.

[0016] It is possible that the lighting device has a plurality of first light sources and that the at least one primary optical system is configured as a collimating optical system having a plurality of collimating lenses each having an entrance face and an exit face through which the light emitted by the first light sources successively passes.

[0017] It can be provided that the at least one secondary optical system has a first portion configured on a transparent substrate having an entrance face and an exit face, wherein a structure is provided on the entrance face and / or the exit face of the substrate, which structure is designed for shaping the light passing through it in the vertical direction in the state in which the lighting device is installed in the vehicle, in particular wherein the substrate is designed for producing a horizontal light-dark boundary and / or a vertically graduated light distribution. Here, the transparent substrate of the at least one secondary optical system can have at least one array of irregularly shaped cylindrical lenses, in particular wherein the entrance face of the substrate has a plurality of input facets of different sizes and wherein the exit face of the substrate has a plurality of output facets of the same size. By this configuration a horizontal light-dark boundary and / or a vertically graduated light distribution can be effectively produced.

[0018] It can be further provided that the at least one secondary optical system has a second portion integrated into the outcoupling optical system, wherein the second portion of the at least one secondary optical system is designed for expanding the light passing through it in the horizontal direction in the state in which the lighting device is installed in the vehicle. Here, the second portion of the at least one secondary optical system can be configured as a strip-shaped structure arranged on the exit face of the outcoupling optical system, in particular wherein the strip-shaped structure consists of cylindrical lenses arranged side by side in the horizontal direction in the state in which the lighting device is installed in the vehicle, wherein the cylinder axes of the cylindrical lenses extend in the vertical direction in the state in which the lighting device is installed in the vehicle in order to expand the light passing through the strip-shaped structure in the horizontal direction. By integrating the second portion of the secondary optical system into the outcoupling optical system, unlike in the lighting devices of the prior art, a transparent second substrate can be dispensed with. In particular, the lighting device can thereby also be configured more compactly.

[0019] It is possible that the illumination device comprises at least two first light sources, two primary optical systems and two secondary optical systems, wherein the illumination device is designed such that light emitted from at least one of the first light sources passes through the first primary optical system and through the first secondary optical system, and light emitted from at least one further first light source passes through the second primary optical system and through the second secondary optical system. Here, the strip-shaped structure of the second part of the first secondary optical system and the strip-shaped structure of the second part of the second secondary optical system can be spaced apart from each other on the exit face of the outcoupling optical system by a distance.

[0020] It can be provided that the projection optical system has a lens, in particular a lens configured as a Fresnel lens, or a convex lens integrated into the outcoupling optical system. Here, the lens of the projection optical system integrated into the outcoupling optical system can be arranged between the strip-shaped structure of the second part of the first secondary optical system and the strip-shaped structure of the second part of the second secondary optical system on the exit face of the outcoupling optical system. Thereby, it is ensured that the light of the at least one first part for generating the main light function and the light of the at least one second part for generating the main light function exit through the same outcoupling optical system. Furthermore, by this configuration, the components of the illumination device for generating the plurality of main light functions can be arranged space-savingly.

[0021] It is possible that the projection optical system, in addition to the lens integrated into the outcoupling optical system, also has at least one further lens which serves as a projection lens. In order to configure the illumination device even more compactly, it can be provided that the at least one further lens serving as a projection lens is combined with the transparent substrate of the at least one secondary optical system in one component.

[0022] It can be provided that the first part of the main light function generated by the at least one first light source, the at least one primary optical system and the at least one secondary optical system is at least one part of the low beam and / or the high beam, preferably a front zone part and / or a city light part of the low beam.

[0023] It can furthermore be provided that the second part of the main light function generated by the second light source and the projection optical system is at least one part of the low beam and / or the high beam, preferably a range part and / or an adaptive high beam of the low beam. Here, the second light source can for example also generate a part of the horizontal cut of the low beam, in particular in the region around the inflection point between the left and right raised parts of the cut. BRIEF DESCRIPTION OF DRAWINGS

[0024] The application is explained in more detail below with the aid of the drawings. Here:

[0025] Figure 1schematic, partially exploded side view of a first embodiment of a lighting device according to the application;

[0026] Figure 2 schematic perspective view of a lighting device according to the application, partially implemented as an exploded view; Figure 1

[0027] Figure 3 schematic perspective view of a lighting device according to the application, partially implemented as an exploded view;

[0028] Figure 4 schematic perspective view of a lighting device according to the application, partially implemented as an exploded view; Figure 3

[0029] Figure 5 schematic perspective view of a lighting device according to the application, partially implemented as an exploded view; Figure 3

[0030] Figure 6 schematic perspective view of a lighting device according to the application, partially implemented as an exploded view; Figure 5 DETAILED DESCRIPTION

[0031] In the various figures, identical or functionally identical parts are provided with the same reference signs.

[0032] The lighting device depicted in the various figures comprises six first light sources 1, two primary optical systems 2 and two secondary optical systems 3, wherein the lighting device is designed for passing light emitted from three of the first light sources 1 through a first of the primary optical systems 2 and through a first of the secondary optical systems 3 and for passing light emitted from the other three of the first light sources 1 through a second of the primary optical systems 2 and through a second of the secondary optical systems 3. The first light sources 1, the two primary optical systems 2 and the two secondary optical systems 3 serve for generating at least a first part of a main light function.

[0033] The lighting device further comprises a second light source 4 having a plurality of light emitting diodes (LEDs), which light emitting diodes each have a light exit face, wherein the light exit faces of the light emitting diodes are arranged in a matrix for purposefully generating pixels of a light distribution of at least a second part of the main light function. The second light source 4 is configured as a solid state LED array, wherein the solid state LED array has for example 48 light emitting diodes or more than 48 light emitting diodes.

[0034] ​​​​The lighting device further comprises a projection optical system 5 which is designed to project the light emitted from the second light source 4 into the exterior space of the motor vehicle. The projection optical system 5 has, in the first embodiment, three convex lenses 6, 7, 8 (cf. Figure 1 ). In the second embodiment, the third convex lens of the three convex lenses 6, 7, 8 is replaced by a lens 9 which is configured as a Fresnel lens (cf. Figure 3 ).

[0035] The lighting device further comprises a coupling-out optical system 10 on which a common exit face 11 for the light of the at least one first portion for generating the primary light function and for the light of the at least one second portion for generating the primary light function is configured.

[0036] In the depicted embodiment, the three first light sources 1 are arranged at a distance from one another in the vertical direction for the first primary optical system 2 and the first secondary optical system 3. Furthermore, the three first light sources 1 are also arranged at a distance from one another in the vertical direction for the second primary optical system 2 and the second secondary optical system 3 (cf. Figure 2 ). It is entirely possible for more or less than three first light sources 1 to be provided respectively. The first light sources 1 are configured as light emitting diodes (LEDs).

[0037] The primary optical systems 2 are each configured as a collimation optical system with three collimation lenses 12, wherein each of the collimation lenses 12 has an entrance face and an exit face respectively (cf. Figure 1 and Figure 2 ). The collimation lenses 12 are likewise arranged at a distance from one another in the vertical direction. Here, each of the first light sources 1 is provided with one of the collimation lenses 12, such that the light emitted from one of the first light sources 1 successively passes through the entrance face and the exit face of the provided collimation lens 12.

[0038] The secondary optical systems 3 each have a first portion which is configured on a transparent substrate 13 with an entrance face 14 and an exit face 15. A structure is provided on the entrance face 14 and the exit face 15 of the substrate 13. Here, the substrate 13 has at least one array of irregularly shaped lenticular lenses, wherein the entrance face 14 of the substrate 13 has a plurality of input facets 16 of different sizes and the exit face 15 of the substrate 13 has a plurality of output facets 17 of the same size (cf. Figure 5 and Figure 6 ). The structure is designed to shape the light passing through the substrate 13 in the vertical direction in the state in which the lighting device is installed in the vehicle, in particular to generate a horizontal light-dark boundary and / or a vertically graduated light distribution.

[0039] In order to shape the light in the horizontal direction, the secondary optical system 3 has a second part, respectively, which is integrated into the outcoupling optical system 10. The second part of the secondary optical system 3 is configured on the exit face 11 of the outcoupling optical system 10, respectively. Here, the light emitted from the base 13 of the respective secondary optical system 3 can enter into the entrance face 18 of the outcoupling optical system 10 opposite the exit face 11 and exit from the exit face 11 of the outcoupling optical system 10.

[0040] On the exit face 11 of the outcoupling optical system 10, a strip-shaped structure is provided as the second part of the secondary optical system 3, which strip-shaped structure is composed of a cylindrical lens, outside the convex lens 8 (see Figure 2 ) or outside the lens 9 configured as a Fresnel lens (see Figure 4 ). Here, the cylindrical lenses are arranged side by side in the horizontal direction in the state in which the lighting device is installed in the vehicle, wherein the cylinder axes of the cylindrical lenses extend in the vertical direction in the state in which the lighting device is installed in the vehicle in order to expand the light passing through the strip-shaped structure in the horizontal direction.

[0041] It is entirely possible for the strip-shaped structure serving as the second part of the secondary optical system 3 to be additionally or alternatively provided on the entrance face 18 of the outcoupling optical system 10.

[0042] In the outcoupling optical system 10, the region provided with the strip-shaped structure is connected to the convex lens 8 or the lens 9 configured as a Fresnel lens in one piece with one another.

[0043] In the first embodiment depicted in Figure 1 and Figure 2 , the two transparent bases 13 of the secondary optical system 3 are combined in one component in one piece with one another.

[0044] In the second embodiment depicted in Figure 3 and Figure 4 , the two transparent bases 13 of the secondary optical system 3 and the second convex lens 7 are configured as separate components separate from one another.

[0045] It is entirely possible for the two transparent bases 13 of the secondary optical system 3 to be combined in one component in one piece with one another in the second embodiment depicted in Figure 3 and Figure 4 .

[0046] It is furthermore entirely possible for the two transparent bases 13 of the secondary optical system 3 and the second convex lens 7 to be configured as separate components separate from one another in the first embodiment depicted in Figure 1 and Figure 2 .

[0047] The second light source 4 is arranged in the horizontal direction between the first light sources 1 in the state mounted in the vehicle. Furthermore, the projection optical system 5 is arranged in the horizontal direction between the first and second primary optical systems 2 and between the first and second secondary optical systems 3 in the state mounted in the vehicle.

[0048] List of reference signs

[0049] 1 first light source

[0050] 2 primary optical system

[0051] 3 secondary optical system

[0052] 4 second light source

[0053] 5 projection optical system

[0054] 6 first convex lens of the projection optical system

[0055] 7 second convex lens of the projection optical system

[0056] 8 third convex lens of the projection optical system

[0057] 9 lens of the projection optical system configured as a Fresnel lens

[0058] 10 outcoupling optical system

[0059] 11 exit surface of the outcoupling optical system

[0060] 12 collimating lens of the primary optical system

[0061] 13 transparent substrate of the secondary optical system

[0062] 14 entrance surface of the transparent substrate

[0063] 15 exit surface of the transparent substrate

[0064] 16 input facets on the entrance surface of the transparent substrate

[0065] 17 output facets on the exit surface of the transparent substrate

[0066] 18 entrance surface of the outcoupling optical system

Claims

1. Lighting equipment for motor vehicles, particularly headlights for motor vehicles, the lighting equipment comprising: —At least one primary light source (1), —At least one primary optical system (2). —At least one secondary optical system (3), wherein the lighting device is designed to allow light emitted from the at least one first light source (1) to pass through the at least one primary optical system (2) and through the at least one secondary optical system (3) to produce at least one first part of the primary light function. —Second light source (4), the second light source having a plurality of semiconductor elements, each semiconductor element having a light emitting surface, wherein the light emitting surfaces of the semiconductor elements are arranged in a matrix to be used to selectively generate at least one second part of the light distribution of the main light function pixels, —Projection optical system (5), which is designed to project light emitted from the second light source into the external space of the vehicle. —A common exit surface (11) for the light used to generate the main light function of at least one first part and the light used to generate the main light function of at least one second part.

2. The lighting device according to claim 1, characterized in that, The lighting device includes a coupling optical system (10) on which a common exit surface (11) for light of at least one first portion used to generate the main light function and light of at least one second portion used to generate the main light function is constructed.

3. The lighting device according to claim 1 or 2, characterized in that, The semiconductor elements of the second light source (4) are constructed as light-emitting diodes and are designed to be manipulated independently of each other to produce pixels of light distribution. In particular, the second light source (4) is constructed as a solid-state LED array, which has, for example, 48 light-emitting diodes or more than 48 light-emitting diodes.

4. The lighting device according to any one of claims 1 to 3, characterized in that, The lighting device has a plurality of first light sources (1), and the at least one primary optical system (2) is configured as a collimating optical system having a plurality of collimating lenses (12), each having an incident surface and an exit surface, and light emitted from the first light source (1) passes sequentially through the incident surface and the exit surface.

5. The lighting device according to any one of claims 1 to 4, characterized in that, The at least one secondary optical system (3) has a first part constructed on a transparent substrate (13) having an incident surface (14) and an exit surface (15). The incident surface (14) and / or the exit surface (15) of the substrate (13) are provided with a structure designed to shape light passing through the structure in a vertical direction when the lighting device is installed in the vehicle. In particular, the substrate (13) is designed to produce a horizontal light-dark boundary and / or a gradually changing vertical light distribution.

6. The lighting device according to claim 5, characterized in that, The transparent substrate (13) of the at least one secondary optical system has at least one array of irregularly shaped cylindrical lenses. In particular, the incident surface (14) of the substrate (13) has a plurality of input facets (16) of different sizes, and the exit surface (15) of the substrate (13) has a plurality of output facets (17) of the same size.

7. The lighting device according to any one of claims 1 to 6, characterized in that, The at least one secondary optical system (3) has a second part that is integrated into the coupling optical system (10). The second part of the at least one secondary optical system (3) is designed to allow light passing through the second part to be extended in the horizontal direction when the lighting device is installed in the vehicle.

8. The lighting device according to claim 7, characterized in that, The second part of the at least one secondary optical system (3) is configured as a strip structure arranged on the exit surface (11) of the coupling optical system (10). In particular, the strip structure is composed of cylindrical lenses arranged side by side in the horizontal direction when the lighting device is installed in the vehicle, and the cylindrical axis of the cylindrical lenses extends in the vertical direction when the lighting device is installed in the vehicle, so that the light passing through the strip structure is extended in the horizontal direction.

9. The lighting device according to any one of claims 1 to 8, characterized in that, The lighting device includes at least two first light sources (1), two primary optical systems (2) and two secondary optical systems (3), and is designed to allow light emitted from at least one of the first light sources (1) to pass through the first primary optical system (2) and through the first secondary optical system (3), and to allow light emitted from at least one other of the first light sources (1) to pass through the second primary optical system (2) and through the second secondary optical system (3).

10. The lighting device according to claim 9, characterized in that, The strip structure of the second part of the first-stage optical system (3) and the strip structure of the second part of the second-stage optical system (3) are spaced apart from each other on the exit surface (11) of the coupling optical system (10).

11. The lighting device according to any one of claims 1 to 10, characterized in that, The projection optical system has lenses (8, 9), especially lenses (9) constructed as Fresnel lenses or convex lenses (8) integrated into the coupling optical system (10).

12. The lighting device according to claim 11, characterized in that, The lenses (8, 9) of the projection optical system (3) integrated into the coupling optical system (10) are arranged on the exit surface (11) of the coupling optical system (10) between the strip structure of the second part of the first-stage optical system (3) and the strip structure of the second part of the second-stage optical system (3).

13. The lighting device according to claim 11 or 12, characterized in that, The projection optical system (3) is attached to lenses (8, 9) integrated into the coupling optical system (10) and also has at least one additional lens (6, 7) that serves as a projection lens.

14. The lighting device according to any one of claims 1 to 13, characterized in that, The first portion of the main light function generated by the at least one first light source (1), the at least one primary optical system (2) and the at least one secondary optical system (3) is at least a portion of the near light and / or the far light, preferably the front portion of the near light and / or the urban light portion.

15. The lighting device according to any one of claims 1 to 14, characterized in that, The second part of the main light function generated by the second light source (4) and the projection optical system (5) is at least a portion of the near light and / or the far light, preferably the near light range portion and / or the adaptive far light.

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