阅读说明：本技术 用于机动车的照明设备、特别是高分辨率的前照灯 (Lighting device for a motor vehicle, in particular high-resolution headlight ) 是由 F·波恩德 于 2020-01-22 设计创作，主要内容包括：本发明涉及一种用于机动车的照明设备、特别是高分辨率的前照灯,所述照明设备包括：具有有源面(3)的成像构件(1),在所述有源面上设置有矩阵式成像元件,以用于有针对性地产生光分布(13)的各像素,其中,所述有源面(3)在第一方向上的延伸尺寸大于在垂直于所述第一方向的第二方向上的延伸尺寸；以及投射光学器件(2),在所述照明设备运行中,从所述有源面(3)发出的光被所述投射光学器件投射到机动车的外部空间中,其中,所述有源面(3)这样定向,使得在机动车的外部空间中所产生的光分布(13)中沿竖直方向并排设置的像素由在所述有源面(3)上沿第一方向并排设置的成像元件产生。(The invention relates to a lighting device for a motor vehicle, in particular a high-resolution headlight, comprising: an imaging component (1) having an active surface (3) on which matrix-type imaging elements are arranged for the targeted generation of individual pixels of a light distribution (13), wherein the active surface (3) has a greater extent in a first direction than in a second direction perpendicular to the first direction; and a projection optics (2) by which, in operation of the lighting device, light emitted from the active surface (3) is projected into an exterior space of the motor vehicle, wherein the active surface (3) is oriented in such a way that pixels arranged next to one another in the vertical direction in a light distribution (13) generated in the exterior space of the motor vehicle are generated by imaging elements arranged next to one another in a first direction on the active surface (3).)

1. Lighting device, in particular high-resolution headlight, for a motor vehicle, comprising:

-an imaging member (1) having an active face (3) on which matrix-type imaging elements are arranged for the targeted generation of individual pixels of a light distribution (13), wherein the active face (3) has a greater extension in a first direction than in a second direction perpendicular to the first direction,

-projection optics (2) by which light emitted from the active surface (3) is projected into the exterior space of the motor vehicle in operation of the lighting device,

characterized in that the active surface (3) is oriented such that pixels arranged side by side in a vertical direction in a light distribution (13) generated in an exterior space of the motor vehicle are generated by imaging elements arranged side by side in a first direction on the active surface (3).

2. A lighting device as claimed in claim 1, characterized in that the active surface (3) is oriented in the mounted state in the motor vehicle such that the first direction corresponds to a vertical line.

3. Illumination device according to one of claims 1 or 2, characterized in that the imaging elements on the active surface (3) are constructed as light emitting diodes or as laser diodes, in particular wherein the imaging member is a solid state L ED array.

4. An illumination device according to one of claims 1 or 2, characterized in that the imaging means (1) is constructed as a digital micromirror device or as an L CoS or as a L C display, or the imaging means comprises a digital micromirror device or a L CoS or a L C display.

5. A luminaire as claimed in one of the claims 1 to 4, characterized in that the projection optics (2) have a surface which is shaped like a toroid.

6. A luminaire as claimed in claim 5, characterized in that the circularly shaped surface widens the light emitted therefrom more strongly in a direction corresponding to the horizontal direction of the light distribution (13) in the external space than in a direction corresponding to the vertical direction of the light distribution (13) in the external space.

7. A lighting device as recited in any one of claims 5-6, wherein said toric surface is a refractive surface.

8. A luminaire as claimed in one of the claims 5 to 7, characterized in that the curved surface is the exit surface (12) of the projection optics (2).

9. A lighting device as claimed in one of claims 1 to 8, characterized in that the projection optics comprise a first part (15) and a second part (16), wherein, in operation of the lighting device, light emanating from the active surface (3) first penetrates the first part (15) or is reflected on the first part (15) and subsequently penetrates the second part (16) or is reflected on the second part (16).

10. The illumination device according to one of the claims 1 to 9, characterized in that the projection optics (2) comprise a portion for imaging the active face (3) of the imaging member (1) with an aspect ratio of the active face (3), in particular wherein the portion (15) is the first portion (15).

11. A lighting device as claimed in one of claims 1 to 10, characterized in that the projection optics (2) comprise a portion (16) having deformation properties, in particular wherein the portion (16) is the second portion (16).

12. A lighting device as claimed in claim 11, characterized in that the portion (16) of the projection optics (2) provided with deformation properties widens the light emitted therefrom more strongly in a direction corresponding to the horizontal direction of the light distribution (13) in the exterior space than in a direction corresponding to the vertical direction of the light distribution (13) in the exterior space.

13. Illumination device according to one of claims 1 to 12, characterized in that the extension of the active face (3) in the first direction is more than twice, in particular more than three times, for example approximately four times, the extension in the second direction.

Technical Field

The invention relates to a lighting device for a motor vehicle according to the preamble of claim 1.

Background

A lighting device of the above-mentioned type is known from DE 102013215359B 3, wherein the lighting device described comprises an imaging component having an active surface on which matrix-type light-emitting diodes (L ED) are arranged for the targeted generation of individual pixels of a light distribution.

When square imaging pixels are projected onto a road surface in a high-resolution headlight, distortion of the pixels necessarily occurs on the road surface due to the inclined projection plane. Pixels that are still roughly square are projected in the vicinity, while pixels of a significantly distorted trapezoid appear at a distance. Thereby, the resolution along the vertical line is significantly reduced with increasing distance, so that possibly projected symbols are distorted. In contrast, all pixels have the same extension in the horizontal direction.

Disclosure of Invention

The object of the invention is to provide a lighting device of the type mentioned in the introduction, in which the resolution in the vertical direction is improved in the light distribution produced by the lighting device.

According to the invention, this is achieved by a lighting device of the type mentioned at the outset having the features of the characterizing part of claim 1. The dependent claims relate to preferred embodiments of the invention.

According to claim 1, the active surface is oriented in such a way that pixels arranged next to one another in the vertical direction in the light distribution generated in the exterior of the motor vehicle are generated by imaging elements arranged next to one another in the first direction on the active surface. In this case, the active surface can be oriented, in particular, in the installed state in the motor vehicle such that the first direction corresponds to a vertical line. In contrast to the prior art, therefore, the greater extent of the active area is assigned to the vertical extent of the light distribution of the headlight, or the lesser extent of the active area is assigned to the horizontal extent of the light distribution of the headlight. This leads to an increase in the pixel density and thus an increase in the resolution in the vertical direction, so that the pixels can be imaged more squarely over a larger range. This enables the symbols to be displayed on the road surface with higher resolution and more faithful detail.

It can be provided that the imaging element on the active surface is designed as a light-emitting diode or as a laser diode, in particular wherein the imaging means is a Solid-State L ED Array (Solid-State-L ED-Array), it can alternatively be provided that the imaging means is designed as a digital micromirror device or as a liquid crystal on silicon (L CoS) or as a liquid crystal Display (L C-Display), or that the imaging means comprises a digital micromirror device or a L CoS or L C Display.

The following possibilities exist: the projection optics have a curved (torisch) shaped face. The curved surface can widen the light emitted therefrom more strongly in a direction corresponding to a horizontal direction of the light distribution in the exterior space than in a direction corresponding to a vertical direction of the light distribution in the exterior space. The ring-shaped surface can thus produce a light distribution with, for example, approximately the same extension in the horizontal and vertical directions, despite a greater number of pixels in the vertical direction.

It can be provided that the toric surface is a refractive surface. In particular, the curved surface can be the exit surface of the projection optics.

The following possibilities exist: the projection optics comprise a first part and a second part, wherein, in operation of the illumination device, light emitted from the active surface first penetrates or is reflected on the first part and then penetrates or is reflected on the second part. By dividing the projection optics into two different parts, different tasks can be assigned to different groups of optics.

It may be provided that the projection optics comprise a portion for imaging the active face of the imaging member with an aspect ratio of the active face, in particular wherein the portion is the first portion.

It can furthermore be provided that the projection optics comprise a portion having deformation properties, in particular wherein the portion is the second portion. In this case, the portion of the projection optics provided with the deformation properties enables the light emitted therefrom to be widened more strongly in a direction corresponding to the horizontal direction of the light distribution in the exterior space than in a direction corresponding to the vertical direction of the light distribution in the exterior space. This also ensures that the light distribution has approximately the same extent in the horizontal and vertical directions despite a greater number of pixels in the vertical direction.

The following possibilities exist: the active area has an extension in the first direction which is more than twice, in particular more than three times, for example approximately four times, the extension in the second direction. This corresponds in particular to the typical extension scale of commercially customary imaging members.

Drawings

The invention is explained in more detail below with the aid of the figures. In the figure:

fig. 1 shows a perspective detail view of a first embodiment of a lighting device according to the invention;

fig. 2 shows a side view of a detail of a second embodiment of the lighting device according to the invention;

fig. 3 shows a vertical cross-sectional view of an exemplary light distribution, which is generated with an embodiment of the lighting device according to the invention;

FIG. 4 shows a graph illustrating an exemplary first pixel density;

FIG. 5 shows a top view of light distribution with a first pixel density;

FIG. 6 shows a graph illustrating an exemplary second pixel density;

FIG. 7 shows a top view of light distribution with a second pixel density;

fig. 8 shows an exemplary illustration of the imaging of three points of the active surface of the illumination device without a targeted widening in the horizontal direction;

fig. 9 shows an exemplary illustration of the imaging of three points of the active surface of the illumination device with a targeted widening in the horizontal direction.

Detailed Description

In the figures, identical and functionally identical components are provided with the same reference symbols.

The exemplary embodiment of the illumination device according to the invention shown in fig. 1 is designed as a high-resolution headlight and comprises an imaging component 1 and a projection optics 2. The imaging component 1 has an active surface 3 with imaging elements arranged in a matrix for the targeted generation of pixels of a light distribution.

Here, the active surface 3 has a larger extension in a first direction corresponding to the vertical direction in fig. 1 and 2 than in a second direction perpendicular to the first direction corresponding to the horizontal direction in fig. 1 and 2. For example, the imaging elements in the first direction and the imaging elements in the second direction may be arranged side by side.

It can be provided that the imaging elements on the active surface 3 are in the form of light-emitting diodes (L ED) or in the form of laser diodes, in particular, the imaging component 1 can be a solid L ED array, so that the light emitted by the individual light-emitting diodes can be projected by the projection optics 2 into the exterior of the motor vehicle, wherein the vertical direction of the resulting light distribution corresponds to the first direction in which the active surface 3 has a greater extent and in which more imaging elements are arranged next to one another.

Alternatively, it can be provided that the imaging component 1 is embodied as a Digital Micromirror Device (DMD) or as L CoS or as a L C display, or that the imaging component 1 comprises a digital micromirror device or as L CoS or a L C display, for example in a digital micromirror device, individual mirror elements are used as imaging elements.

In this alternative embodiment of the imaging member 1 as a digital micromirror device or L CoS or L C display, the illumination device additionally comprises at least one not shown light source, the light of which exits onto the imaging member and is selectively reflected or transmitted by the imaging member in order to produce a corresponding light distribution.

In this embodiment of the imaging component 1, the light emitted by the individual imaging elements is also projected by the projection optics 2 into the exterior of the motor vehicle. The vertical direction of the generated light distribution also corresponds to the first direction in which the active area 3 has a greater extent and in which more imaging elements are arranged next to one another.

By orienting the active surface 3 in such a way that more imaging elements are provided in the vertical direction than in the horizontal direction, it is possible to display symbols on the road surface with higher resolution and more faithful detail. The reason for this is that the distortion of the pixels or segments on the road surface that inevitably occurs due to the inclined projection plane is related to the pixel density of the light distribution in the vertical direction. This is illustrated on the one hand by a comparison of fig. 4 with fig. 5 and on the other hand by a comparison of fig. 6 with fig. 7.

Fig. 4 and 5 schematically show a first pixel density 4 and a first light distribution 5, while fig. 6 and 7 illustrate a second pixel density 6 and a second light distribution 7. Here, the first pixel density 4 is smaller than the second pixel density 6. In the case of a first, lower pixel density 4, it is shown that the section 8 of the light distribution 5 remote from the vehicle diverges relatively strongly. Whereas in the case of a larger second pixel density 6 the segments 9 of the light distribution 7 diverge less strongly. This results in a higher pixel density 6 in the vertical direction of the light distribution 7, with less divergence or distortion and therefore a higher resolution and more faithful representation of the symbol on the road surface.

The projection optics 2 of the first embodiment of the illumination device, which is shown in fig. 1, comprises two transparent substrates 10, 11, through which the light emitted from the active surface 3 in turn penetrates. At least some of the entry and/or exit surfaces of the substrates 10, 11 are curved or formed as lenses in order to appropriately image the active surface 3 into the exterior space of the vehicle. In this case, the exit surface 12 of the second substrate 11 is curved.

The following possibilities are fully available: the other surface of the substrates 10 and 11 or a plurality of the surfaces of the substrates 10 and 11 are formed in a loop shape instead of the exit surface 12 of the second substrate 11.

Furthermore, the following possibilities exist: instead of one of the substrates 10, 11 or instead of both substrates 10, 11, one or more mirrors with appropriately shaped reflecting surfaces are used.

By means of the curved design, the exit surface 12 can widen the light emitted therefrom more strongly in the horizontal direction of the light distribution than in the vertical direction. Thereby, although the ratio of the vertical direction to the horizontal direction of the active face 3 is, for example, 4:1, a light distribution having a ratio of the vertical direction to the horizontal direction of 1:1 can be produced. Fig. 3 shows a vertical cross-sectional view of an example of such a light distribution 13.

Fig. 8 and 9 illustrate the effect of the curved surface of the projection optics 2. Fig. 8 shows an exemplary illustration of the imaging of three points 14 of the active surface of the illumination device without a targeted widening in the horizontal direction. Fig. 9 shows an exemplary illustration of the imaging of three points 14 of the active surface of the illumination device with a targeted widening 14a, 14b in the horizontal direction. The widened portions 14a, 14b can be realized here by a curved surface of the projection optics 2.

The projection optics 2 of the second embodiment of the illumination device shown in fig. 2 comprise a first portion 15 and a second portion 16, through which light emanating from the active face 3 passes in this order. Here, the first part 15 comprises three transparent substrates 17, 18, 19, while the second part 16 comprises two substrates 20, 21, through which light penetrates. At least some of the entry and/or exit surfaces of the respective substrates 17, 18, 19, 20, 21 are curved or formed as lenses in order to image the active surface 3 appropriately into the exterior space of the vehicle.

The following possibilities are fully available: instead of one of the substrates 17, 18, 19, 20, 21 or instead of a plurality or all of the substrates 17, 18, 19, 20, 21, one or more mirrors with suitably shaped reflecting surfaces are used.

The first part 15 of the projection optics 2 is designed in such a way that it images the active surface 3 of the imaging member 1 with the aspect ratio of the active surface 3. The second part 16 is designed in such a way that it has deformation properties. This can be achieved, for example, by differently designed cylindrical geometries on the entry and/or exit faces of the substrates 20, 21 of the second part 16.

The second section 16 can thus in particular widen the light emitted therefrom more strongly in the horizontal direction of the light distribution than in the vertical direction. Therefore, as in the first embodiment, although the ratio of the vertical direction to the horizontal direction of the active surface 3 is, for example, 4:1, light distribution having a ratio of the vertical direction to the horizontal direction of 1:1 can be produced (see fig. 3). The advantage of the second embodiment according to fig. 2 is that the second substrate 21 serving as an exit lens can be constructed significantly smaller than in the first embodiment according to fig. 1.

The following possibilities are fully available: the portion for imaging the active surface 3 with the correct aspect ratio is the second portion in the light propagation direction, and the portion provided with the deformation characteristic is the first portion in the light propagation direction.

List of reference numerals

1 imaging member

2 projection optics

3 active surface of imaging member

4 first pixel density

5 first light distribution

6 second pixel Density

7 second light distribution

8 section of a first light distribution

9 section of a second light distribution

10. 11 substrate for projection optics

12 exit face of substrate of projection optics

13 light distribution

14 imaging of points of the active surface

14a, 14b the extension of the imaging point in the horizontal direction

15 first part of the projection optics

16 second part of the projection optics

17. 18, 19 substrates of the first part

20. 21 substrate of the second part