EP2846077A2 - Projection lens for use in an LED module of a motor vehicle headlight, and LED module and motor vehicle headlamp with such a projection lens - Google Patents

Abstract

The invention relates to a projection optical system (16) for use in an LED module (6) of a motor vehicle headlight (1). The LED module (6) has a light source (10) in the form of an LED matrix, which comprises a plurality of matrix-like juxtaposed and / or superimposed LED chips (11), a primary optics (12), the next several matrix-like and / or superimposed primary optic elements (13), for bundling the light emitted by the light source (10) and the projection optics (16). The projection optics (16) project a light exit surface (17) of the primary optics (12) for generating a predetermined light distribution (27) on a roadway in front of the vehicle. In order to improve the light distribution (27) with regard to intensity fluctuations and color effects, it is proposed that the projection optics (16) be designed such that they have on their image side at least two separate images (25, 26, 28, 29) offset from one another in the horizontal direction. the light exit surface (17) of the primary optics (12) produced. (Figure 10)

Description

The present invention relates to a projection optics for use in an LED module of a motor vehicle headlight. The LED module has a light source in the form of an LED matrix, which comprises a plurality of LED chips arranged side by side and / or one above the other, a primary optics comprising a plurality of primary optics arranged next to and / or above one another, for bundling the of the Light emitted light and the projection optics on. The projection optics project an exit surface of the primary optics for generating a predetermined light distribution on a roadway in front of a vehicle.

In addition, the present invention relates to an LED module and a motor vehicle headlight with such a projection optics.

Motor vehicle headlights with a light source in the form of an LED matrix, which comprises a plurality of matrix-like juxtaposed and / or superimposed LED chips are also referred to as matrix headlights. In this case, the LED matrix may consist of a single row or column with a plurality of LED chips or of a plurality of rows or columns arranged above or next to one another, each with a plurality of LED chips. Matrix headlights produce a light distribution on the road ahead of the motor vehicle, which has a plurality of juxtaposed partial light distributions in the form of pixels or stripes. As a rule, each LED chip generates its own partial light distribution. By selective control, in particular switching on / off or dimming, the individual LED chips of the matrix light source, it is possible to influence the shape and intensity of the light distribution. In this way, a matrix headlight without moving parts can be used to generate an adaptive light distribution. In particular, in this way a low-beam basic light distribution with horizontal light-dark boundary, a conventional low-beam asymmetric light beam distribution, a high beam distribution, a Teilfernlichtverteilung in which targeted areas are excluded from the light distribution, where other road users were detected, or a marker light distribution, in the targeted the roadway in front of the vehicle detected objects are illuminated, are generated. Matrix floodlights are known in various embodiments from the prior art, cf. for example. EP 2 306 073 A2 . EP 2 306 074 A2 . EP 2 306 075 A2 or DE 10 2008 013 603 A1 ,

Furthermore, for example, from the DE 10 2011 077 132 A1 and the DE 10 2011 077 636 A1 Approaches especially to so-called strip headlights known in which the generated Light distribution comprises a plurality of juxtaposed strip-shaped partial light distributions.

From the DE 10 2010 046 626 B4 approaches to the design of a color-correcting projection optics for matrix headlights are known.

Finally, in the EP 2 280 215 A2 proposed to improve the homogeneity and resolution of the image in the resulting light distribution through the use of multiple LED modules in one headlight. Each primary optic is assigned an individual projection optics (or secondary optics). For the known headlights so always two light source modules, at least two primary optics modules and at least two secondary optics modules are combined. At least two light exit surfaces per matrix headlight are visible from the outside. The result is a so-called facet-eye-headlight module. The projected on the road strip partial light distributions have a relatively large angular width of at least 2 ° horizontally or even significantly more. Although the superposition of such broad stripes improves the homogeneity of the light distribution, it reduces the achievable resolution. The known headlamp requires at least two complete, mutually independent light modules per headlamp, each light module has an LED matrix, a primary optic and a secondary optics. Thus, such a headlamp consists of at least two light sources, two primary optics and two secondary optics.

In all of the prior art known matrix headlights, however, the problem arises that it in the resulting light distribution to color and Intensity fluctuations comes. These are mainly caused by the dispersion (change in the refractive index of optical materials as a function of the wavelength of light) and aberrations of the projection optics. The color variations occur in particular at the edge of the individual partial light distributions.

Based on the described prior art, the present invention has the object, a matrix headlight of the type mentioned or parts thereof to design and further develop that the headlight with a single primary optics and a single projection optics has improved homogeneity of the resulting light distribution, wherein the light distribution is visible from the outside to emerge from a single light exit opening or from a single projection optics from the headlight.

To solve this problem is proposed starting from the projection optics of the type mentioned that the projection optics is formed so that it generates at least two separate mutually offset in the horizontal direction mappings of the exit surface of the primary optics on its image page, so that a superimposition of the images produced improves the homogeneity of the light distribution.

With the projection optics according to the invention, it is possible to generate the desired improved and more homogeneous matrix light distribution from a single visible and tangible outlet opening (so-called one-eye-matrix headlight). The proposed projection optics achieve a compensation of color effects and homogeneity or intensity fluctuations up to half a pixel width, without the use of Special glasses or plastics needed and without the sharpness of image, in particular to reduce the pixel edge sharpness. Thanks to the proposed projection optics, color compensation and homogeneity improvement can thus be achieved in a matrix headlight without additional loss of sharpness, in particular with respect to the periodically appearing color, homogeneity and aberrations.

An important aspect of the present invention can be seen in that a single matrix-like light source, which is preceded by a single integral primary optics, whose exit light distribution is imaged on the light exit surface on the roadway via a single integral projection optics such that at least two separate primary optics mappings arise , so that in their interaction pixel edges and boundary steepnesses are maintained and the remaining periodically occurring color and homogeneity or intensity fluctuations compensate each other. There are various possibilities for configuring the projection lens in the sense of the invention to produce the effect described above.

To realize the projection optics according to the invention, it is conceivable to vary one or more active optically effective surfaces of the projection optics. In particular, this may be a light entry surface, a light exit surface and / or any other surface therebetween (eg in the case of an achromatic lens). The active optically effective surface of the projection optics is preferably divided and / or displaced in such a way that the at least two separate images of the light exit surface of the primary optics, which are displaced in the horizontal direction, are generated. each The generated images contribute a part of the common luminous flux or a part of the intensity and the illuminance. The proportion each image contributes depends on the number of separate images generated. Thus, the proportion is preferably 50% for two images and accordingly for three images 33% of the common value of the resulting light distribution.

Advantageously, the projection optics is designed such that the separate images of the exit surface of the primary optics are each offset by a value b / n to each other, where b is a width, in particular an angular width, of a pixel formed by imaging a single light exit surface of a single primary optic element and n a number of the separate images of the exit surface of the primary optics generated by the projection optics is. If the projection optical system is designed, for example, to produce two separate images of the light exit surface of the primary optics, these two images are preferably offset by half a pixel width from one another. Accordingly, the images of the light exit surface of the primary optics are preferably offset from one another by one third of the pixel width when the projection optics are designed to produce three separate images. In this way, a particularly homogeneous light distribution can be generated.

An important aspect of the present invention resides in the fact that a single matrix-like light source, which is preceded by a single integral primary optics, whose exit light distribution is imaged on the light exit surface on the roadway via a single integral projection optics such that at least two separate Primary optics mappings arise, so that in their interaction pixel edges and boundary steepness are preserved and the remaining periodically occurring color and homogeneity or intensity fluctuations compensate each other. There are various possibilities for configuring the projection lens in the sense of the invention to produce the effect described above.

According to a first advantageous development of the present invention, it is proposed that the projection optics have at least two separate optical axes. The separate optical axes of the projection optics preferably run in the same horizontal plane. The horizontal plane preferably comprises a module axis of an LED module provided with the projection lens. The module axis preferably extends from the center of the light exit surface of the primary optics in the direction of travel. The distance between the optical axes is relatively small. It is chosen so that separate images of the light exit surface of the primary optics are generated, which are offset from each other in the horizontal direction by a fraction of a pixel. The different optical axes of the projection optics cause different images of the light exit surface of the primary optics are generated. The number of separate images produced by the projection lens corresponds to the number of separate optical axes. The images of the light exit surface of the primary optics are offset from each other according to the course of the optical axes. The fact that the optical axes extend in the same horizontal plane, the separate images are offset only in the horizontal direction to each other. If the optical axes were arranged in different horizontal planes, this would result In addition, a vertical offset of the images to each other.

According to a preferred embodiment of the invention, it is proposed that the separate optical axes of the projection optics run parallel and at a distance from one another. Alternatively, it is proposed that the separate optical axes of the projection optics run obliquely to each other. In this case, the optical axes of the projection optics preferably intersect in a plane of the light exit surface of the primary optics. The plane of the light exit surface is preferably perpendicular to the horizontal plane in which the optical axes are arranged. It is particularly preferred if the oblique optical intersect at an intersection of the module axis with the light exit surface of the primary optics.

According to another preferred embodiment of the present invention, it is proposed that at least one active optical surface of the projection optics is provided with alternating optical regions arranged side by side and / or one above another for producing substantially identical images of the exit surface of the primary optics, wherein a first group of the optical Produces areas a first image of the exit surface of the primary optics and generates at least one other group of optical areas at least one further image of the exit surface of the primary optics, wherein the images generated in the resulting light distribution in the horizontal direction offset from each other. In this sense, at least one active optical surface of the projection optics strip or checkerboard be provided with the alternating areas. Each group of areas is assigned its own optical axis, which is separate from the optical axes of other groups of areas.

Preferably, the alternating optical regions are formed on a light exit surface of the projection optics. It is further preferred that the alternating optical areas are strip-shaped, wherein the strips extend in the vertical direction. If the projection optics produce two separate images of the light exit surface of the primary optics, the strip-shaped regions are preferably assigned alternately to one of two groups. Accordingly, preferably every third strip-shaped region is assigned to one of three groups if the projection optics produce three separate images of the light exit surface of the primary optics.

According to a further preferred embodiment of the invention, it is proposed that the active optical surface of the projection optics is provided with a plurality of prisms extending over the entire surface, whose longitudinal axes extend parallel to one another, wherein a prism surface of the prisms represents the first image of the exit surface of the prism Primary optics generated and the other prism surface of the prisms generated the second image of the exit surface of the primary optics. The prism surfaces may be flat or curved.

According to yet another preferred embodiment of the present invention, it is proposed that a tip of the prisms is flattened over its entire longitudinal extent, so that a roof surface of the prisms results, which produces a further image of the primary optic light exit surface, which differs from the other two figures in FIG horizontal direction is offset. In this way, the projection optics can therefore be three separate, in horizontal Generate direction offset images of the light exit surface of the primary optics. The images are preferably offset by b / 3 with respect to each other, where b is the width, in particular an angular width, of a pixel of the resulting light distribution, that is to say a partial image of a partial light exit surface of a primary optics element.

According to yet another preferred embodiment of the invention, it is proposed that the prism surfaces of the prisms are each subdivided into two partial surfaces over their entire longitudinal extent, wherein a contact line of the partial surfaces of a prism surface of a prism runs parallel to the longitudinal axis of the prism, wherein the partial surfaces each have a separate and to the other images staggered image of the light exit surface of the primary optics generate. In this way, in the case of a prism with a tip, the projection optics can thus produce four separate images of the light exit surface of the primary optics which are staggered in the horizontal direction. In a prism with a flattened tip and roof surface, the projection lens can even produce five separate images of the light exit surface of the primary optics offset in the horizontal direction. The images are preferably offset by w '/ 4 or w' / 5 relative to each other, where w 'is the width, in particular an angular width, of a pixel of the resulting light distribution, ie a partial image of a partial light exit surface of a primary optics element.

Of course, other suitable structures for generating the separate images of the light exit surface of the primary optics can be provided. Furthermore, it is conceivable to use the structures for generating the separate images by an arbitrary scattering structure overlap.

Finally, it is proposed that the alternating optical regions formed on the at least one active optical surface of the projection optical system have an amplitude of less than 0.1 mm, preferably less than a few tens of micrometers, most preferably of a few micrometers.

By using a projection optical system according to the invention in an LED module of a motor vehicle headlight, an LED module according to the invention can be realized. Likewise, by using a projection optical system according to the invention in a motor vehicle headlight, an inventive headlight can be realized.

Fig. 1

einen erfindungsgemäßen Kraftfahrzeugscheinwerfer gemäß einer bevorzugten Ausführungsform;

Fig. 2

ein erfindungsgemäßes LED-Modul eines Kraftfahrzeugscheinwerfers gemäß einer bevorzugten Ausführungsform;

Fig. 3

eine Lichtverteilung eines aus dem Stand der Technik bekannten Matrix-Scheinwerfers;

Fig. 4

eine erste Abbildung einer Lichtaustrittsfläche einer Primäroptik eines erfindungsgemäßen LED-Moduls;

Fig. 5

eine zweite Abbildung einer Lichtaustrittsfläche einer Primäroptik des erfindungsgemäßen LED-Moduls;

Fig. 6

eine aus einer Überlagerung der Abbildungen aus den Fig. 4 und 5 resultierende Lichtverteilung des erfindungsgemäßen LED-Moduls;

Fig. 7

eine beispielhafte Lichtverteilung mit ISO-Linien auf einem Messschirm eines aus dem Stand der Technik bekannten LED-Moduls;

Fig. 8

eine der Lichtverteilung aus Fig. 7 entsprechende beispielhafte Lichtverteilung eines erfindungsgemäßen LED-Moduls;

Fig. 9

eine erfindungsgemäße Projektionsoptik mit parallelen optischen Achsen;

Fig. 10

eine erfindungsgemäße Projektionsoptik mit schräg stehenden optischen Achsen;

Fig. 11

eine erfindungsgemäße Projektionsoptik mit alternierenden optisch wirksamen Bereichen auf der Lichtaustrittsfläche;

Fig. 12

eine erfindungsgemäße Projektionsoptik mit einer Prisma-Struktur auf der Lichtaustrittsfläche;

Fig. 13

verschiedene Beispiele für Strukturen auf einer optisch aktiven Fläche einer erfindungsgemäßen Projektionsoptik;

Fig. 14

weitere Beispiele für Strukturen auf einer optisch aktiven Fläche einer erfindungsgemäßen Projektionsoptik;

Fig. 15

ein Ausschnitt einer Prisma-Struktur auf einer optisch aktiven Fläche einer erfindungsgemäßen Projektionsoptik; und

Fig. 16

weitere Beispiele für Strukturen auf einer optisch aktiven Fläche einer erfindungsgemäßen Projektionsoptik.

Further features and advantages of the invention are explained in more detail below with reference to the figures. Show it:

Fig. 1

a motor vehicle headlamp according to the invention according to a preferred embodiment;

Fig. 2

an inventive LED module of a motor vehicle headlight according to a preferred embodiment;

Fig. 3

a light distribution of a known from the prior art matrix headlight;

Fig. 4

a first image of a light exit surface primary optics of an LED module according to the invention;

Fig. 5

a second illustration of a light exit surface a primary optics of the LED module according to the invention;

Fig. 6

one from a superimposition of the illustrations from the Fig. 4 and 5 resulting light distribution of the LED module according to the invention;

Fig. 7

an exemplary light distribution with ISO lines on a screen of an LED module known from the prior art;

Fig. 8

one of the light distribution Fig. 7 corresponding exemplary light distribution of an LED module according to the invention;

Fig. 9

a projection optical system according to the invention with parallel optical axes;

Fig. 10

a projection optical system according to the invention with inclined optical axes;

Fig. 11

a projection optical system according to the invention with alternating optically effective regions on the light exit surface;

Fig. 12

a projection optical system according to the invention with a prism structure on the light exit surface;

Fig. 13

various examples of structures on an optically active surface of a projection optics according to the invention;

Fig. 14

further examples of structures on an optically active surface of a projection optical system according to the invention;

Fig. 15

a section of a prism structure on an optically active surface of a projection optics according to the invention; and

Fig. 16

further examples of structures on an optically active surface of a projection optical system according to the invention.

In FIG. 1 an inventive motor vehicle headlamp is designated in its entirety by the reference numeral 1. The headlight 1 has a housing 2, which is preferably made of plastic. In a light exit direction 3, the headlight housing 2 has a light exit opening 4, which is closed by means of a transparent cover 5. The cover 5 is made of glass or plastic. On the cover 5, at least partially optically effective profiles (eg prisms or cylindrical lenses) may be arranged to scatter the light passing through (so-called diffuser). But it is also conceivable that the cover 5 is formed without such optically active elements (so-called clear disc).

Inside the headlight housing 2, a light module 6 is arranged. The light module 6 can serve to generate any desired headlight function or a part thereof. In particular, the light module 6 can be used to produce a low beam distribution, a high beam distribution, a fog light distribution or any adaptive light distribution. Furthermore, a further light module 7 can be arranged in the housing 2. This serves, for example, to generate another headlight function. It would also be conceivable that the light modules 6, 7 together generate certain headlight function. For example, the light module 7 could produce a low beam basic light distribution with a relatively wide spread and a horizontal cut-off. The light module 6 could then generate a low-beam spotlight distribution which is relatively strongly concentrated in comparison with the low-beam basic light distribution of the light module 7 and has an asymmetrical cut-off at the top. A superposition of the basic light distribution and the spotlight distribution results in a conventional low-beam distribution. Of course, it is conceivable that in the headlight housing 2 in addition to the light modules 6, 7 further light modules are arranged. In addition, only one light module, for example the light module 6 without the light module 7, can be arranged in the spotlight housing 2. Finally, it is possible for one or more luminaire modules, such as the luminaire module 8 shown by way of example, to be arranged in the housing 2. The lighting module 8 is used to generate any lighting function, such as a flashing light, a position light, a daytime running light, etc.

The light module 6 is preferably designed as an inventive LED module. The LED module 6 is shown in detail in FIG FIG. 2 shown. The LED module 6 has a light source in the form of an LED matrix, which is designated in its entirety by the reference numeral 10. The LED matrix 10 has a plurality of matrix-like side by side and one above the other arranged LED chips 11. Furthermore, the LED module 6 comprises a primary optic, which is designated in its entirety by the reference numeral 12. The primary optics 12 has a plurality of matrix-like side by side and superimposed primary optic elements 13. In the illustrated Embodiment, each LED chip 11 is assigned its own primary optics element 13. As shown in detail I, which shows such a primary optic element 13 together with an LED chip 11 assigned to it, the LED chip 11 emits light in a main emission direction 14, which for the most part couples into the primary optic element 13 via a light entry surface 15. The primary optic element 13 itself may be designed as a conventional reflector for mirror reflection or as a so-called intent optical element of a transparent material (eg glass or plastic) for total reflection. In the illustrated example, the primary optic element 13 is designed as a totally reflecting front optic made of a transparent plastic material. The primary optics 12 can focus the light emitted by the LED matrix 10. Finally, the LED module 6 comprises a projection optics 16, which is formed as an optical lens. The projection optics 16 is also referred to as secondary optics. It projects an exit surface 17 of the primary optics 12 for generating a predetermined light distribution on a roadway in front of a vehicle equipped with the headlight 1 and the LED module 6. The projection optics 16 may be formed as a conventional optical lens or as an achromat.

The headlight 1 with the LED module 6 is also referred to as a matrix headlight, since it generates a light distribution with a plurality of side by side and / or superimposed pixel or strip-shaped partial light distributions. The individual partial light distributions, which are generated by the light of an LED 11 and the associated primary optics element 13, are also referred to as pixels. Each of the partial light distributions is represented by the image of a partial light exit surface of a single primary optic element 13 the primary optics 12 generated by the projection optics 16. In FIG. 3 By way of example, a light distribution of a known from the prior art matrix headlight 1 is shown. The light distribution 20 is imaged on a measuring screen 21, which is arranged at a defined distance from the headlight 1 or the LED module 6 in front of the motor vehicle. In addition, a horizontal HH and a perpendicular vertical VV are drawn on the measuring screen. It can be clearly seen that the light distribution 20 illustrated here by way of example has a multiplicity of pixels 22, 23, 24 arranged next to and above one another. In particular, the pixels 22, 23, 24 are arranged in the illustrated embodiment in three rows and in thirty columns. The pixels of the upper row are designated by the reference numeral 22, the pixels of the middle row by the reference numeral 23 and the pixels of the lower row by the reference numeral 24. Each pixel 22, 23, 24 of the illustrated light distribution 20 is generated by an LED chip 11 in cooperation with the associated primary optics element 13 after projection by the secondary optics 16.

By selectively controlling the individual LED chips 11 of the LED matrix 12, it is possible to vary the resulting light distribution 20 almost as desired. So it is conceivable, for example, temporarily turn off those LED chips 11, in the pixel area of the light distribution 20 other road users have been detected. In this way, can be driven continuously with high beam, with a dazzling of other road users by the locally removed from the light distribution 20 pixels 22, 23, 24 is prevented (so-called Teilfernlicht). It would also be conceivable that the LED module 6 generates a low-beam distribution with an asymmetrical upper bright-dark boundary, wherein the LED chips 11 are turned off to produce the upper row of pixels 22 except for a few LED chips 11 for generating the pixels 22 on its own traffic side. In addition, it would be conceivable to turn on objects detected on a roadway in front of the motor vehicle by selectively switching on individual LED chips 11 to generate one or more pixels 22, 23 above the cut-off line of the low beam, so that the objects detected in front of the roadway are specifically illuminated can be (so-called marker light or marker light). Any other adaptive light distributions 20 can also be achieved by targeted switching on / off and / or dimming of the LEDs 11.

In particular, along the edge of the individual pixels 22, 23, 24, the resulting light distribution 20 may have an undesirable color fringe. In addition, it can come in the light distribution 20 to clearly visible intensity fluctuations. The present invention is intended to improve the homogeneity of the light distribution 20 with regard to disturbing color effects and intensity fluctuations.

In particular, the present invention proposes a special homogenizing projection optics (or secondary optics) 16 as a component of a matrix headlight 1 for motor vehicles, in which a light exit surface 17 of the primary optics 12 consists of a plurality of periodic structures arranged in pixel or strip form, which are formed by the special projection optics 16 is projected onto the roadway to realize a dynamic low beam, partial high beam, matrix light or high beam function. The projection optical system 16 generates at least two separate ones on the image side, ie on the roadway or on a measuring screen 21 Figures 25, 26 (cf. FIGS. 4 and 5 ) of the object-side light exit surface 17 of the primary optics 12. By superposing the at least two separate images 25, 26 results in a resulting light distribution 27 (see. FIG. 6 ), wherein the at least two images 25, 26 are offset from one another in the horizontal direction in such a way that a clear improvement in the homogeneity of the light distribution 27 results. In particular, unwanted color effects or intensity fluctuations in the light distribution 27 are deliberately reduced or even completely eliminated. The separate images 25, 26 of the light exit surface 17 of the primary optics 12 are generated by a common projection optics 16.

A first image 25 of the light exit surface 17 of the primary optics 12, which can be produced by the projection optics 16 according to the invention, is shown by way of example in FIG FIG. 4 shown. Figure 25 off FIG. 4 is offset in the example shown by about 1/4 pixel to the left with respect to the vertical VV. In FIG. 5 a second image 26 of the light exit surface 17 of the primary optics 12 is shown. The second separate image 26 is shifted in the illustrated embodiment by about ¼ pixels to the right with respect to the vertical VV. Thus, the first and second images 25, 26 are offset by about 1/2 pixel relative to each other. Each image 25, 26 contributes half the common luminous flux to the resulting total light distribution 27, and half the intensity and half illuminance to the total value of the light distribution 27. As the edges of the pixels 22, 23, 24 and the pixel centers of the images 25, 26 do not lie one above the other, compensate for color and intensity inhomogeneities by superimposing the images 25, 26 each other. So that's it with the present invention possible to generate from a single LED module 6 with a primary optics 12 and a projection optics 16 a much more homogeneous light distribution 27 than is possible in the prior art under comparable conditions or conditions.

The intensity of the individual images 25, 26 depends on the length of the prism surfaces or on the proportion of the prism base surface which is assigned to the corresponding prism surface. A preferred embodiment comprises prisms with equal prism base area proportions.

To illustrate the invention is in the in the FIGS. 7 and 8 shown light distributions 20, 27 with marked ISO lines (isolux lines to designate areas of the same illuminance) referenced. In FIG. 7 the light distribution 20, which was produced by means of a conventional LED module, is shown. The illustrated light distribution 20 is a low-beam distribution or a partial high-beam light, with the entire area of the oncoming lane having been removed from the light distribution 20 in order to prevent dazzling oncoming road users. The light distribution 20 is imaged on a measuring screen 21. It can be clearly seen that the lines 30 of the same intensity or illuminance have inhomogeneities which are recognizable by the restless line course. In contrast, the lines 31 of the same intensity or illuminance have significantly less inhomogeneities in the light distribution 27 produced by the matrix headlight 1 or the LED module 6 according to the invention, which can be recognized by the significantly quieter course of the line.

The FIGS. 7 and 8 show by way of example the same low-beam pattern 20, 27 of a matrix headlight 1 with an LED matrix light source 10 with three lines. All the LED chips 11 of the LED matrix 10 that generate pixels of the upper and lower rows on the left side of the light distribution 20, 27, plus one pixel each on the right side of the light distribution 20, 27 near the HV point are turned off, not to blind the oncoming traffic. The ISO lines 30 in FIG. 7 are much more restless. The ISO lines 31 of the light distribution 27 off FIG. 8 on the other hand are smoother and with fewer deviations

In FIG. 9 an inventive LED module 6 is shown with a projection optics 16 according to the invention in detail. The illustrated embodiment of the projection optics 16 is used to generate two separate images 25, 26 of the light exit surface 17 of the primary optics 12. Of course, the projection optics 16 can also be configured so that it produces more than two separate and mutually displaced in the horizontal direction mappings. The projection optics 16 has two parallel optical axes, which are designated by the reference numerals 40 and 41. The reference numeral 42 denotes a module axis of the LED module 6, which extends from the center of the primary optics 12 in the direction of travel 3. The distance between the optical axes 40, 41 is small and only so large that the projection optics 16 can project two separate images 25, 26 with 1/2 pixel spacing on the roadway in front of the motor vehicle. The optical axes 40, 41 are preferably arranged on a common horizontal plane, which preferably also includes the module axis 42. In the exemplary embodiment shown, the projection optical system 16 is divided into two halves 16a, 16b along a vertical center plane, which comprises the module axis 42 divided. One half 16a is preferably associated with the optical axis 41 and the other half 16b is preferably associated with the optical axis 40.

It is not necessary that all active optical surfaces of the projection optics 16 must undergo a division and / or displacement of the generating surfaces. It is sufficient if only one of these surfaces is formed in a corresponding manner. This may be, for example, a light entry surface, a light exit surface or an area of the primary optics 16 arranged therebetween. However, at least one of the active optical surfaces of the projection optical system 16 must be modified in such a way that the at least two images 25, 26 of the light exit surface 17 of the primary optics 12 can be generated, which are offset from one another in the horizontal direction.

In FIG. 10 a further embodiment of an LED module 6 according to the invention with two optical axes 43, 44 is shown, which run obliquely to each other. Preferably, the optical axes 43, 44 intersect in a plane of the light exit surface 17 of the primary optics 12. The optical axes 43, 44 are preferably arranged on a common horizontal plane, which preferably also includes the module axis 42. In the illustrated embodiment, a first half 16a of the projection optics 16 of the optical axis 44 and a second half 16b of the projection optics 16 of the optical axis 43 are assigned.

Another preferred embodiment of the projection optics 16 according to the invention is based on a special structure on one of the active optical surfaces of the projection optics 16. In FIG. 11 is a corresponding Embodiment shown, wherein on the light exit surface of the projection optics 16 juxtaposed alternating optical regions 16c, 16d are formed. In the illustrated embodiment, the regions 16 c, 16 d are arranged in strips on the light exit surface of the projection optical system 16. Of course, the areas may also be formed like a checkerboard or in any other way. Furthermore, it is conceivable that the optical regions 16c, 16d are not formed on the light exit surface but on the light entry surface or any other surface between the light entry surface and the light exit surface of the projection optics 16. The optical regions 16c, 16d are designed to produce substantially identical images 25, 26 of the exit surface 17 of the primary optic 12. In this case, all regions 16c together generate a first image of the light exit surface 17 and all regions 16d together form a second image 26 of the exit surface 17. The first optical regions 16c is preferably the first optical axis 40 and the second optical regions 16d is preferably the second optical axis 41 assigned. In this way, a projection optical system 16 can be realized, which can produce a plurality of separate images 25, 26 of the light exit surface 17 of the primary optics 12, which are offset in the horizontal direction relative to each other. In the embodiment of FIG. 11 Thus, the first optical regions 16c form a first group, which generate the first image 25 of the exit surface 17, and the second regions 16d form a second group, which generate the second image 26 of the exit surface 17 of the primary optics 12.

In FIG. 11 the first areas 16c are marked with a hatching. However, this serves first Line for identifying and better distinguishing the two areas 16c, 16d from each other. This does not necessarily mean that an optically active structure, for example a scattering structure, is formed on the light exit surface of the projection optical system 16 in the regions 16c, whereas such a structure is not formed in the regions 16d. However, this would be possible. It would also be conceivable to provide a scattering structure on the entire light exit surface of the projection optics 16.

In FIG. 12 a further embodiment of an LED module 6 and a projection optical system 16 according to the invention is shown. In this case, an active optical surface of the projection optics 16, in the illustrated embodiment, the light exit surface, provided with a plurality of extending over the entire surface, side by side prisms whose longitudinal axes parallel to each other and in the vertical direction. A first prism surface 16e of the prisms generates a first image 25 of the exit surface 17 of the primary optics 12. Another prism surface 16f of the prisms produces a second image 26 of the exit surface 17 of the primary optic 12. Thus, a first prism surface 16e forms a second prism surface 16f of each of the prisms Prisms on the light exit surface of the projection optics 16. Preferably, the first optical axis 41 and the other prism surfaces 16f, the second optical axis 42 associated with the first prism surfaces 16e. In this way, separate images 25, 26 of the exit surface 17 of the primary optics 12 are generated, which are offset in the horizontal direction to each other.

The amplitudes of the prism structure on the light exit surface of the projection optical system 16 FIG. 12 are relatively small, so that they are difficult to see with the naked eye. In particular, an order of magnitude of the amplitudes of a few micrometers to a few tens of micrometers is intended. The structures are perceived by an observer from outside of the headlight 1 through the cover 5 through at most as slightly indicated stripes or alternatively as a relatively inconspicuous checkerboard pattern on the projection optics 16.

In FIG. 13 various design possibilities of the prism structure on the optically active surface of the projection optics 16 are proposed. In each of the subfigures 13a), 13b), 13c), a cross section through one of the prisms is shown at the top in each case, and below this, the images of the light exit surface 17 of the primary optics 12 that can be achieved by the illustrated prism structure are shown.

The prism structure out FIG. 13a ) corresponds to the prism structure, which in the embodiment of the projection optics 16 off FIG. 12 was applied. The images 25 and 26 achievable thereby are offset by 1/2 pixel width w 'from one another. In the embodiment of FIG. 13b ) is a tip of the prisms 16e, 16f flattened over its entire longitudinal extent, so that a roof surface 16g of the prisms results, which produces a further image 28 of the light exit surface 17 of the primary optics 12, to the other two images 25, 26, through the prism surfaces 16e, 16f are generated, offset in the horizontal direction. The three images 25, 26, 28 are preferably mutually offset by 1/3 pixel width w 'in the horizontal direction. In order to achieve the desired pitch to 1/3 of the pixel or stripe width w ', the prism angle α must be suitably adapted. The Surface 16g produces an image 28 in the center of the light distribution. In the embodiment of FIG. 13c ) are the prism surfaces 16e, 16f of the prisms over their entire longitudinal extent in each case in two partial surfaces 16e1, 16e2; Divided 16f1, 16f2. In this case, a contact line of the partial surfaces 16e1,16e2; 16f1, 16f2 of a prism surface 16e; 16f of a prism parallel to a longitudinal axis of the prism. The partial surfaces 16e1,16e2; 16f1, 16f2 of a prism surface 16e; 16f produce two separate and staggered images 25, 28; 26, 29, which also to the other figures 26, 29; 25, 28 are offset. In particular, it is proposed that the four images 25, 26, 28, 29 of the light exit surface 17 of the primary optics 12 are each offset by 1/4 pixel width w 'from each other.

Of course, it would also be conceivable to produce more than four images of the light exit surface 17 of the primary optics 12 by means of other embodiments of the prism structure. For example, it would be conceivable for the prism structure FIG. 13c ) the tip of the prisms is flattened over its entire longitudinal extent, so that a roof surface similar to the roof surface 16c of the prism structure of FIG. 13b ), which produces a further image of the light exit surface 17 of the primary optics 12.

In FIG. 14 Further possible embodiments of the prism structure are shown on the optically active surface of the projection optics 16. The actual prisms of the Figure 14a ), 14b), 14c) correspond substantially to the prisms of the FIGS. 13a ), 13b), 13c). In the embodiment of FIG. 14 however, straight portions 16h are provided between the individual prisms 16e, 16f. This makes it possible with the prism structure out Figure 14a ) to produce a total of two plus an equal three separate images of the light exit surface 17 of the primary optics 12. It is the same with the prismatic structure FIG. 14b ) it is possible to generate a total of two plus two equal four separate images. The strips 16g and 16h can produce identical images, because the optical axes are not tilted to each other, and thereby the images are superimposed. In a similar way can through the prismatic structure FIG. 14c ) four plus a five images of the light exit surface 17 of the primary optics 12 are generated.

h =

Prismenhöhe in Millimeter,

w =

Wellenlänge (eine Periode) der Prismenstruktur (oder Basisbreite eines Prismas) in Millimeter,

ε =

Lichteinfallswinkel bezüglich einer Flächennormalen der Prismenfläche 16f,

ω =

Lichtauskoppelwinkel bezüglich der Flächennormalen der Prismenfläche 16f,

δ =

ω - ε = Winkeldifferenz zwischen einfallendem Lichtstrahl und ausgekoppeltem Lichtstrahl,

α =

Prismenwinkel bezüglich eines Lots bzw. Winkel einer Prismenfläche 16e, 16f bezüglich einer Lotfläche, und

ϕ =

Pixelbreite in Winkelgrad.

Based on FIGS. 15 and 16 will be explained below how the height of the prism structure of a projection lens 16 according to the invention can be calculated. It will be in FIG. 15 exemplified by the prism structure according to FIG. 12 and FIG. 13a ) went out. In FIG. 15 mean:

h =

Prism height in millimeters,

w =

Wavelength (one period) of the prism structure (or base width of a prism) in millimeters,

ε =

Light incident angle with respect to a surface normal of the prism surface 16f,

ω =

Light extraction angle with respect to the surface normal of the prism surface 16f,

δ =

ω - ε = angular difference between incident light beam and coupled light beam,

α =

Prism angle with respect to a solder of a prism surface 16e, 16f with respect to a solder surface, and

φ =

Pixel width in angular degrees.

In the prism structure out FIG. 15 the following relationship applies: $$\tan \alpha =\frac{\mathrm{<figure-callout\; id="2"\; label="H\; w"\; filenames="imgf0001.png,imgf0010.png"\; state="\{\{state\}\}">H\; </figure-callout>}}{\frac{w}{}}=\frac{2H}{w}$$

In addition, the Snell equation applies: $$\frac{\mathrm{sin\epsilon }}{\mathrm{sin\omega }}=\frac{n_L}{n_{\mathit{PMMA}}}$$

This results after forming and with n _L = 1 for air: $$\sin \omega =n_{\mathit{PMMA}}\cdot \sin \epsilon$$

For ω this results in: $$\omega =\arcsin \left(n_{\mathit{PMMA}}\cdot \sin \epsilon \right)$$

Furthermore: $$\delta =\omega -\epsilon =\arcsin \left(n_{\mathit{PMMA}}\cdot \sin \epsilon \right)-\epsilon \stackrel{!}{=}{\frac{1}{4}}^{\underset{\underset{\mathit{pixel\; width}\left[°\right]}{\{}}{\phi }}$$

und nach einer Umformung $$n_{\mathit{PMMA}}\cdot \sin \epsilon =\sin \left(\frac{\phi }{4}+\epsilon \right)$$

bzw. $$n_{\mathit{PMMA}}\cdot \sin \epsilon =\sin \frac{\phi }{4}\cdot \cos \epsilon +\cos \frac{\phi }{4}\cdot \sin \epsilon$$

und $$\left({\mathit{n}}_{\mathit{PMMA}}-\mathit{cos}\frac{\phi }{4}\right)\cdot \sin \epsilon =\sin \frac{\phi }{4}\cdot \cos \epsilon$$

Daraus ergibt sich $$\tan \epsilon =\frac{\sin \frac{\phi }{4}}{n_{\mathit{PMMA}}-\cos \frac{\phi }{4}}$$

bzw. $$\epsilon =\arctan \left(\frac{\sin \frac{\phi }{4}}{n_{\mathit{PMMA}}-\cos \frac{\phi }{4}}\right)$$

The angular difference must therefore be +/- 1/4 pixel width for two separate images 25, 26 of the light exit surface 17 of the primary optics 12, so that the two images 25, 26 are offset by 1/2 pixel width from each other. This results from equation (4): $$\arcsin \left(n_{\mathit{PMMA}}\cdot \sin \epsilon \right)=\frac{\mathrm{<figure-callout\; id="4"\; label="\phi "\; filenames="imgf0001.png,imgf0008.png"\; state="\{\{state\}\}">\phi </figure-callout>}}{4}+\epsilon$$

and after a transformation $$n_{\mathit{PMMA}}\cdot \sin \epsilon =\mathrm{<figure-callout\; id="4"\; label="sin\; \phi "\; filenames="imgf0001.png,imgf0008.png"\; state="\{\{state\}\}">sin\; </figure-callout>}\left(\frac{\phi }{}\right)\left(\frac{}{4}+\epsilon \right)$$

respectively. $$n_{\mathit{PMMA}}\cdot \sin \epsilon =\mathrm{<figure-callout\; id="4"\; label="sin\; \phi "\; filenames="imgf0001.png,imgf0008.png"\; state="\{\{state\}\}">sin\; </figure-callout>}\frac{\phi }{}\frac{}{4}\cdot \cos \epsilon +\cos \frac{\phi }{4}\cdot \sin \epsilon$$

and $$\left({\mathit{n}}_{\mathit{PMMA}}-\mathit{<figure-callout\; id="4"\; label="cos\; \phi "\; filenames="imgf0001.png,imgf0008.png"\; state="\{\{state\}\}">cos\; </figure-callout>}\frac{\phi }{}\frac{}{4}\right)\cdot \sin \epsilon =\mathrm{<figure-callout\; id="4"\; label="sin\; \phi "\; filenames="imgf0001.png,imgf0008.png"\; state="\{\{state\}\}">sin\; </figure-callout>}\frac{\phi }{}\frac{}{4}\cdot \cos \epsilon$$

This results in $$\tan \epsilon =\frac{\sin \frac{\phi }{4}}{n_{\mathit{PMMA}}-\mathrm{<figure-callout\; id="4"\; label="cos\; \phi "\; filenames="imgf0001.png,imgf0008.png"\; state="\{\{state\}\}">cos\; </figure-callout>}\frac{\phi }{}\frac{}{4}}$$

respectively. $$\epsilon =\arctan \left(\frac{\sin \frac{\phi }{4}}{n_{\mathit{PMMA}}-\mathrm{<figure-callout\; id="4"\; label="cos\; \phi "\; filenames="imgf0001.png,imgf0008.png"\; state="\{\{state\}\}">cos\; </figure-callout>}\frac{\phi }{}\frac{}{4}}\right)$$

For α = ε the result is: $$\epsilon =\arctan \left(\frac{H}{\frac{\mathrm{<figure-callout\; id="2"\; label="w"\; filenames="imgf0001.png,imgf0010.png"\; state="\{\{state\}\}">w</figure-callout>}}{2}}\right)=\mathrm{<figure-callout\; id="2"\; label="arctan"\; filenames="imgf0001.png,imgf0010.png"\; state="\{\{state\}\}">arctan</figure-callout>}\left(\frac{2H}{w}\right)$$

From Equations (10) and (11) follows: $$\frac{2H}{w}=\frac{\sin \frac{\phi }{4}}{n_{\mathit{PMMA}}-\mathrm{<figure-callout\; id="4"\; label="cos\; \phi "\; filenames="imgf0001.png,imgf0008.png"\; state="\{\{state\}\}">cos\; </figure-callout>}\frac{\phi }{}\frac{}{4}}$$

This results in a 1/2 pixel offset for the required prism height h: $${\mathrm{<figure-callout\; id="1"\; label="H"\; filenames="imgf0001.png"\; state="\{\{state\}\}">H</figure-callout>}}_{\frac{1}{2}\mathit{pixel\; offset}}=\frac{\mathrm{<figure-callout\; id="2"\; label="w"\; filenames="imgf0001.png,imgf0010.png"\; state="\{\{state\}\}">w</figure-callout>}}{2}\cdot \frac{\sin \frac{\phi }{4}}{n_{\mathit{PMMA}}-\mathrm{<figure-callout\; id="4"\; label="cos\; \phi "\; filenames="imgf0001.png,imgf0008.png"\; state="\{\{state\}\}">cos\; </figure-callout>}\frac{\phi }{}\frac{}{4}}$$

At a 1/2 pixel offset, the images 25, 26 are reversed φ / 2 shifted to each other (+/- φ / 4). This is a so-called 1st order compensation. For 2nd-order compensation, two 2-D image groups must be shifted from each other. The following explains how to determine the prism height h for a 2nd order compensation: $${\mathrm{<figure-callout\; id="1"\; label="H"\; filenames="imgf0001.png"\; state="\{\{state\}\}">H</figure-callout>}}_{\frac{1}{4}\mathit{pixel\; offset}}=\mathit{Pixel\; offset\; of}\frac{\phi }{4}=+l-\frac{\phi }{\mathrm{8th}}$$

This results in the prism height h: $${\mathrm{<figure-callout\; id="1"\; label="H"\; filenames="imgf0001.png"\; state="\{\{state\}\}">H</figure-callout>}}_{\frac{1}{4}\mathit{pixel\; offset}}=\frac{2\mathrm{<figure-callout\; id="2"\; label="w"\; filenames="imgf0001.png,imgf0010.png"\; state="\{\{state\}\}">w</figure-callout>}}{2}\cdot \frac{\sin \frac{\phi }{\mathrm{8th}}}{n_{\mathit{PMMA}}-\cos \frac{\phi }{\mathrm{8th}}}$$

At very small angles: $$\begin{array}{ll}\hfill \sin \theta =\theta \mathit{and}\mathrm{<figure-callout\; id="2"\; label="sin\; \theta "\; filenames="imgf0001.png,imgf0010.png"\; state="\{\{state\}\}">sin\; </figure-callout>}\frac{\theta }{}\frac{}{2}& =\frac{\mathrm{<figure-callout\; id="2"\; label="\theta "\; filenames="imgf0001.png,imgf0010.png"\; state="\{\{state\}\}">\theta </figure-callout>}}{2}\mathit{and}\sin \frac{\theta }{\mathrm{8th}}=\frac{1}{2}\mathrm{<figure-callout\; id="4"\; label="sin\; \phi "\; filenames="imgf0001.png,imgf0008.png"\; state="\{\{state\}\}">sin\; </figure-callout>}\frac{\phi }{}\frac{}{4}\\ \hfill \cos \frac{\phi }{4}& \approx \cos \frac{\phi }{\mathrm{<figure-callout\; id="1"\; label="8th\; \approx "\; filenames="imgf0001.png"\; state="\{\{state\}\}">8th\; </figure-callout>}}\approx 1\end{array}$$

This results in the prism height h for the 2nd order compensation: $${\mathrm{<figure-callout\; id="1"\; label="H"\; filenames="imgf0001.png"\; state="\{\{state\}\}">H</figure-callout>}}_{\frac{1}{4}\mathit{pixel\; offset}}=\frac{2\mathrm{<figure-callout\; id="2"\; label="w"\; filenames="imgf0001.png,imgf0010.png"\; state="\{\{state\}\}">w</figure-callout>}}{2}\cdot \frac{1}{2}\frac{\sin \frac{\phi }{4}}{n_{\mathit{PMMA}}-\mathrm{<figure-callout\; id="4"\; label="cos\; \phi "\; filenames="imgf0001.png,imgf0008.png"\; state="\{\{state\}\}">cos\; </figure-callout>}\frac{\phi }{}\frac{}{4}}={\mathrm{<figure-callout\; id="1"\; label="H"\; filenames="imgf0001.png"\; state="\{\{state\}\}">H</figure-callout>}}_{\frac{1}{2}\mathit{pixel\; offset}}$$

In summary, it can thus be said that for small angles the 1st order, 2nd order, etc. compensation is done with triangular structures superimposing and having a 2-fold, 4-fold, etc. wavelength and the same amplitude. In FIG. 16 is an example of a section of a surface structure for an optically active surface of a projection optical system 16 according to the invention shown. In this case, the structure of the first order is shown with a solid line 50, a structure of the second order with a dashed line 51 and a sum of the two structures 50, 51 with the reference number 52.

The first-order structure 50 generates two separate images 25, 26 of the light exit surface 17 of the primary optics 12, which are shifted by 1/2 pixel width from each other. The second-order prism structure 51 has half the frequency (double period) and always tilts two adjacent edges (a whole period) of the structure of the first order 50 with one of its edges (prism surfaces) and thus leads to a displacement of the images from one another. 4 pixel width.

The prism structure 52 is the sum (resulting) of the 1st order prism structure 50 and the 2nd order prism structure 51.

The amplitude h of the 1st order structure 50 is related to the required deflection angle of +/- 0.3 °. For a period (wavelength w) of 2 mm and a refractive index N _PMMA = 1.49 and of n _air = 1.0, the prism height h is given by: $${\mathrm{<figure-callout\; id="1"\; label="H"\; filenames="imgf0001.png"\; state="\{\{state\}\}">H</figure-callout>}}_{\frac{1}{2}\mathit{pixel\; offset}}=\frac{\mathrm{<figure-callout\; id="2"\; label="w"\; filenames="imgf0001.png,imgf0010.png"\; state="\{\{state\}\}">w</figure-callout>}}{2}\frac{\sin 0.3°H}{n_{\mathit{PMMA}}-\cos 0.3°H}=10.7\mathit{microns}$$

The calculated prism height h = 10.7 μm is relatively large. Therefore, the wavelength w is halved from originally 2 mm to 1 mm. This then results for the amplitude h of the prism structure: $${\mathrm{<figure-callout\; id="1"\; label="H"\; filenames="imgf0001.png"\; state="\{\{state\}\}">H</figure-callout>}}_{\frac{1}{2}\mathit{pixel\; offset}}=\frac{w=1\mathit{<figure-callout\; id="2"\; label="mm"\; filenames="imgf0001.png,imgf0010.png"\; state="\{\{state\}\}">mm</figure-callout>}}{2}\cdot \frac{\sin 0.3°\mathrm{<figure-callout\; id="1"\; label="H"\; filenames="imgf0001.png"\; state="\{\{state\}\}">H</figure-callout>}}{1.49-\cos 0.3°H}=5.3\mathit{microns}$$

The prism structure 51 is placed over the prism structure of the first order 50, but should reach only half the deflection (1/2 x 1/2 pixels → +/- 0.15 ° H). From equation (14) it follows: $${\mathrm{<figure-callout\; id="1"\; label="H"\; filenames="imgf0001.png"\; state="\{\{state\}\}">H</figure-callout>}}_{\frac{1}{4}\mathit{pixel\; offset}}=\frac{2\mathrm{<figure-callout\; id="2"\; label="w"\; filenames="imgf0001.png,imgf0010.png"\; state="\{\{state\}\}">w</figure-callout>}}{2}\frac{\sin 0.15°\mathrm{<figure-callout\; id="1"\; label="H"\; filenames="imgf0001.png"\; state="\{\{state\}\}">H</figure-callout>}}{1.49-\cos 0.15°H}=5.3\mathit{microns}$$

Thus, the result from equation (15) is confirmed. The 2nd order prism structure 51 has the same amplitude h as the 1st order prism structure 50. In the manner described above, higher order adjustments can in principle also be generated.

Claims (17)

Projection optics (16) for use in an LED module (6) of a motor vehicle headlamp (1), wherein the LED module (6) a light source (10) in the form of an LED matrix, the plurality of matrix-like juxtaposed and / or one above the other LED chips (11), a primary optics (12) comprising a plurality of matrix-like juxtaposed and / or superposed primary optics (13) for bundling the light emitted by the light source (10) and the projection optics (16), wherein the projection optics (16) project a light exit surface (17) of the primary optics (12) for generating a predetermined light distribution (27) on a roadway in front of the vehicle, characterized in that the projection optics (16) are designed such that they at least two separate, horizontally offset images (25, 26, 28, 29) of the light exit surface (17) of the primary optics (12) are generated, so that a superimposition of the images produced (25, 26, 28, 29) improves a homogeneity of the light distribution (27). Projection optics (16) according to claim 1, characterized in that the separate images (25, 26, 28, 29) of the light exit surface (17) of the primary optics (12) are each offset by a value w '/ n to each other, where w' a width, in particular an angular width, of a pixel formed by the image of a single light exit surface of a single primary optics element (13) the resulting light distribution (27) and n is a number of the separate images (25, 26, 28, 29) of the light exit surface (17) of the primary optics (12) generated by the projection optics (16). Projection optics (16) according to claim 1 or 2, characterized in that the projection optics (16) improves the homogeneity of the light distribution (27) with regard to a compensation of intensity fluctuations and undesired color effects in the light distribution. Projection optics (16) according to one of claims 1 to 3, characterized in that the projection optical system (16) has at least two separate optical axes (40, 41, 43, 44). Projection optics (16) according to claim 4, characterized in that the separate optical axes (40, 41; 43, 44) of the projection optics (16) extend in the same horizontal plane. Projection optics (16) according to claim 4 or 5, characterized in that the separate optical axes (40, 41) of the projection optics (16) parallel and spaced from each other. Projection optics (16) according to claim 4 or 5, characterized in that the separate optical axes (43, 44) of the projection optics (16) extend obliquely to one another. Projection optics (16) according to claim 7, characterized in that intersect the optical axes (43, 44) of the projection optics (16) in a plane of the light exit surface (17) of the primary optics (12). Projection optics (16) according to any one of claims 1 to 3, characterized in that at least one active optical surface of the projection optics (16) with juxtaposed and / or superimposed alternating optical regions (16c, 16d) for generating substantially the same images ( 25, 26) of the exit surface (17) of the primary optics (12), wherein a first group (16c) of the optical regions generates a first image (25) of the light exit surface (17) of the primary optic (12) and at least one further group (16) 16d) of the optical regions generates at least one further image (26) of the exit surface (17) of the primary optics (12), wherein the images (25, 26) produced in the resulting light distribution (27) are arranged offset from one another in the horizontal direction. Projection optics (16) according to claim 9, characterized in that the alternating optical regions (16c, 16d) are formed on a light exit surface of the projection optics (16). Projection optics (16) according to claim 9 or 10, characterized in that the alternating optical regions (16c, 16d) are strip-shaped, wherein the strips extend in the vertical direction. Projection optics (16) according to any one of claims 9 to 11, characterized in that the active optical surface of the projection optics (16) having a plurality of extending over the entire surface, arranged side by side Prisms (16e, 16f) whose longitudinal axes are parallel to each other, wherein a prism surface (16e) of the prisms forming a first optical region generates the first image (25) of the light exit surface (17) of the primary optic (12) and the another prism surface (16f) of the prisms, which forms a further optical region, the second image (26) of the exit surface (17) of the primary optics (12) generated. Projection optics (16) according to claim 12, characterized in that a tip of the prisms (16e, 16f) is flattened over its entire longitudinal extension, so that a roof surface (16g) of the prisms results, which forms another image (28) of the light exit surface (16). 17) of the primary optics (12), which is offset from the other two images (25, 26) in the horizontal direction. Projection optics (16) according to claim 12 or 13, characterized in that the prism surfaces (16e, 16f) of the prisms are subdivided into two sub-areas (16e1, 16e2; 16f1, 16f2) over their entire longitudinal extent, a contact line of the subareas (16e1 , 16e2, 16f1, 16f2) of a prism surface (16e, 16f) of a prism is parallel to the longitudinal axis of the prism, with the sub-surfaces (16e1, 16e2, 16f1, 16f2) each separated and offset from the other images (25, 26) arranged image (25, 26, 28, 29) of the light exit surface (17) of the primary optics (12) produce. Projection optics (16) according to one of Claims 9 to 14, characterized in that the alternating optical regions (16c, 16d; 16e, 16f) formed on the at least one active optical surface of the projection optics (16) have an amplitude of less than 0.1 mm, preferably less than a few tens of microns, whole particularly preferably of a few microns. LED module (6) of a motor vehicle headlamp (1), wherein the LED module (6) comprises a light source (10) in the form of an LED matrix which comprises a plurality of LED chips (11) arranged next to and / or above one another in the form of a matrix, a primary optic (12) which comprises a plurality of primary optics elements (13) arranged next to and / or above one another for bundling the light emitted by the light source (10) and projection optics (16) having an exit surface (17) of primary optics (12) 12) for generating a predetermined light distribution (27) projected onto a roadway in front of a vehicle, characterized in that the projection optical system (16) is designed such that it has on its image side at least two separate horizontally offset images (25, 26) the exit surface (17) of the primary optics (12) generated so that an overlay of the images produced (25,26) improves a homogeneity of the light distribution (27). Motor vehicle headlight (1) with an LED module (6), which comprises a light source (10) in the form of an LED matrix, which comprises a plurality of LED chips (11) arranged next to and / or above one another, a primary optic (12), which comprises a plurality of primary optic elements (13) arranged next to and / or above one another for bundling the light emitted by the light source (10) and projection optics (16) having an exit surface of the primary optics (16) for generating a predetermined light distribution (27 Projected on a roadway in front of a vehicle, characterized in that the projection optics (16) is designed such that it has on its image side at least two separate horizontally offset images (25, 26) of the exit surface (17) of the primary optics (12 ), so that a superposition of the images produced (25, 26) improves the homogeneity of the light distribution (27).

Images