EP2799762A2 - Light module for a motor vehicle headlamp - Google Patents

Abstract

Disclosed is a light module (14) of a motor vehicle headlight, with a plurality of light sources (28), a primary optics (30) and a secondary optics (12), wherein the primary optics (30) is adapted to collect outgoing light from the light sources and into an intermediate light distribution (68), which has the shape of a closed luminous surface, and wherein the secondary optics (12) has an object-side focal length, the primary optics and the secondary optics are arranged so that the intermediate light distribution at a distance of this focal length in the light path before the secondary optics , The light module is characterized in that the light exit surfaces of the light sources (28) are separated by distances between them and that the primary optics (30) is arranged to distribute outgoing light from the light sources so that the distances in the intermediate light distribution ( 68) are not recognizable.

Description

The present invention relates to a light module of a motor vehicle headlight according to the preamble of claim 1.

Such a light module is assumed to be known here. A light module of a motor vehicle headlight is an assembly that alone or in conjunction with other light modules of the same headlight or at least one other headlight when used as intended in a motor vehicle generates a rule-compliant light distribution in advance of the motor vehicle.

The assumed as known light module has a plurality of light sources, a primary optics and a secondary optics, wherein the primary optics is adapted to collect from the light sources outgoing light and to transfer to an intermediate light distribution, which the shape having a closed illuminated surface. The secondary optics has an object-side focal length, and the primary optics and the secondary optics are arranged so that the intermediate light distribution is at a distance of this focal length in the light path before the secondary optics.

Intermediate light distributions of light modules, which are to produce a light distribution with a light-dark boundary, are bounded on at least one side by a sharp edge.

The secondary optics is a lens or a reflector and has an object-side focal plane, which is characterized in that contours lying in it are sharply imaged in a front of the light module in the propagation direction of the light behind the secondary optics.

Recently, semiconductor light sources such as light-emitting diodes (LED) are increasingly used as light sources in motor vehicle headlights. While (signal) lights for premium vehicles with LEDs were used at the beginning of this development, the low beam and high beam of mid-range cars will also be optionally produced by LEDs in the future.

As a result of this development, a market for low cost low and high beam light modules using LEDs as light sources is emerging.

Powerful LED dipped-beam modules are today usually designed as projection lamps. In this case, a two-stage optical system initially generates a real intermediate image of the light exit surface of the light-emitting diodes used as light sources. There are so-called arrays of several Light emitting diodes used to generate sufficiently large light fluxes. The light exit surface of a single LED used in such an array is, for example, square and has an edge length of about one millimeter. The individual LEDs are arranged within the array in such a way that their light exit surfaces adjoin one another directly and virtually without spacing, so that a coherent total light exit surface of the array results. A disadvantage of these light modules in particular the high price of the projection lens and the expensive LED arrays.

Reflecting systems in which a reflector in simple reflection (1-stage optics) generates a low-beam distribution are much simpler in design. The light distribution is formed as a superposition of many elementary images of the light source. The light source image is understood to mean the image of the light source through an infinitesimally small reflector zone. To superimpose the light source images to a homogeneous light distribution, the light source itself should also have a uniform luminance. In addition, the light source requires a sharp boundary, with the imaging of the sharp cut-off of the low beam distribution is generated. As a result, the simple, low-cost reflective optics require an expensive LED array as the light source.

If, instead of an LED array, which has a quasi-closed light-emitting surface, a plurality of individual, spaced-apart LEDs (for example: SMD LEDs, surface mounted design SMD), so lead the gaps between the LED chips and thus in particular between the light exit surfaces to dark Strip in the light distribution. If one tries to blur the resulting stripes of light distribution by scattering optics on the reflector surface to a homogeneous light distribution, the maximum illuminance is reduced at least in the ratio chip width to the sum of chip width and chip gap. This means that the average luminance of such a blurred light source is lower than an array in which the LED chips are arranged directly next to one another, at least in the said ratio.

Due to tolerances of the individual chips also in connection with the color-converting phosphor, the sides of the LED chips are never really in line, which leads to unclean cut-offs in the image of the array.

Since in reflection systems the light-dark boundary is not generated by projection of a diaphragm, as in projection systems, but is composed of differently oriented light source images, in conventional reflection systems the light center is significantly lower than the light-dark boundary than in projection systems. This will affect the range as the range decreases as the brightness of the bright area just below the cut-off line decreases. It is also disadvantageous that reflection systems do not achieve such high illuminance gradients at the light-dark boundary as are usual in projection systems.

Against this background, the object of the invention in the specification of a compact as possible light module that can be operated with low-cost SMD LEDs and does not require expensive, voluminous projection lens. Furthermore The aim is to match the performance of the light module with respect to illuminance at the edge of a cut-off line of a low-beam light distribution and with respect to the gradient of the gradient of the brightness curve across the cut-off line to the performance of projection modules.

This object is achieved with the features of claim 1. From the light module assumed to be known, the present invention differs in that the light exit surfaces of the light sources are separated by distances between them and that the primary optics is adapted to distribute outgoing light from the light sources so that the distances in the intermediate light distribution not are recognizable.

The aforementioned multiple light sources are preferably realized as an LED array. The secondary optics preferably has a plurality of facets, resulting in multiple light source side foci or a focal line. Thus, in particular, it is preferred that the secondary optics have a plurality of object-side focal points.

In the light path behind the intermediate light distribution, in one embodiment, a faceted reflector is arranged as secondary optics. The reflector is preferably configured to generate from the intermediate light distribution a complete low-beam distribution which has an asymmetrical rise.

The reflector can be replaced by a faceted lens with corresponding focus positions. In an alternative embodiment, the secondary optics is realized as a faceted lens. By the case of lenses in the Compared to reflectors more favorable ratio of focal length to aperture (f-number) results in the lens secondary optics a lower color aberration.

In this way, the intermediate light distribution in some way represents a substitute light source having the required property of a streak-free appearance and which, together with a low-cost reflection system, can be used to produce a rule-compliant light distribution.

A preferred embodiment is characterized in that the primary optics for each light source has its own optically effective portion, each having a light exit surface and wherein these light exit surfaces adjoin one another without spacing, and at least two adjacent light exit surfaces adjacent to each other so that at least one side edge of a first of two adjacent light exit surfaces in line with a side edge of the second of the two adjacent light exit surfaces, so that the two aligned edges form a common, straight edge.

The primary optics is preferably a one-piece optical array, wherein each LED is assigned an optically effective partial area as collecting primary optics and wherein all primary optics with their light exit surfaces largely contiguous. At least two of these optics form with their light exit surfaces a common straight edge.

It is also preferable that each subregion is a condenser lens. In this case, the optical array is preferably off Plankonvexlinsen constructed and is preferably made of organic or inorganic glass or silicone rubber (LSR). Organic glasses are, for example, polymethyl methacrylate (PMMA), cycloolefin copolymer (COC), cycloolefin polymer (COP), polycarbonate (PC), polysulfone PSU or polymethacrylmethylimide (PMMI). The lens array preferably has, at least in sections, a straight edge on one side. For this purpose, the collecting lens array is bounded on one edge at least in sections by a flat side surface on which a part of the incident light is reflected. Alternatively, this edge can also be formed by a diaphragm which is brought into the beam path immediately in front of the light exit surface of the lens array.

Alternatively, it is preferred that each subregion is a reflector. In this case, the primary optic is preferably formed as a reflector array, which is constructed of conically widening toward the light exit reflectors having in planes on which the main emission of the LED is perpendicular, preferably square or rectangular cross-sections. Preferably, the reflectors have the geometry of a truncated pyramid. It is also preferred that the reflector array consists of a metallized, high temperature resistant plastic, in particular of a thermoplastic material. High-temperature-resistant thermoplastics which are suitable are, for example, polyether ether ketone, polyether imide or polysulfone. The metallization consists for example of aluminum, silver, platinum, gold, nickel, chromium, copper, tin or alloys containing these metals. The metallization is then preferably sealed by a transparent layer.

Instead of the metallization, a multilayer coating can be applied to the plastic body. Multilayer coating alternately combines several low- and high-index layers. Under the mirroring metal or multilayer layer, a further metal layer may be provided as a radiation barrier. This metal layer is deposited, for example, as a thick copper or nickel layer on the plastic body of the reflector array and thus forms a protection against the thermal stress by the radiation of the LED. Also, this thick metal layer is able to dissipate heat to the reflector edge.

Between the reflector array and the LED, a heat shield can be provided, which shadows radiation from the LED on the back of the reflector body and thus prevents thermal overload of the reflector material. The reflector array preferably has at least one straight edge as the edge of a series of light exit surfaces of adjacent reflector subregions.

As a further alternative, it is also preferred that each subregion is a light guide.

In this case, the primary optic is preferably formed as a light guide array, which consists of conically widening towards the light exit optical fibers, which have in planes on which the main emission of the LED is perpendicular, preferably square or rectangular cross-sections. The light entry surface of the individual optical waveguide subregions is preferably arranged flat and parallel to the chip surface of the associated LED. This will make a bigger part of the LED Outgoing luminous flux coupled into the optical fiber portion as in a convex curvature. In addition, the refraction already causes some bunching. A further bundling takes place by reflections on the side walls of the light guide, which is due to the shape that widens towards the exit of light. The reflections on the sidewalls also distinguish light guides from lenses that are also transparent solids. In the case of lenses, direction changes of the light take place only by refraction, but not by reflection on side walls.

It is also preferred that the light exit surface of the individual light guides is convex. As a result, a bundling effect is achieved when the light emerges. The light guide array is preferably made of one of the materials previously referred to as lens material. The light guide array has at least one straight edge, which is composed of adjoining edges of individual light exit surfaces of adjacent light guide subregions.

A further preferred embodiment is characterized in that the light module has a diaphragm which is arranged in the beam path of the light immediately behind the light exit surface so that it shadows a part of the intermediate light distribution.

The diaphragm facilitates the generation of a sharp light-dark boundary of the intermediate light distribution, which also has a favorable effect on the sharpness of the rule-compliant light distribution to be generated in the run-up to the light module. The aperture is in a preferred embodiment as an insert or two-component injection molded part to the Primary optics with molded, resulting in the advantage of low tolerances between aperture and primary optics.

It is also preferable that the secondary optics have at least one concave mirror reflector. In particular, a concave reflector has the advantages of lower costs and lower weight compared to transparent solids such as lenses or internal total reflection secondary optics.

In order to achieve a good sharpness of the bright-dark boundary and thus a high illuminance gradient, all reflectors are preferably arranged in the beam path so that the beam path is always folded at the respective reflectors in the sharpest possible angle (<90 °). Due to the acute folding angle of the beam path, the elementary images of the replacement light source hardly change their orientation, so that low-beam light distribution with good homogeneity (no longitudinal stripes in the light distribution), high light center (close to the low-beam light-dark boundary) and sharp light-dark Can produce limit.

Further, it is preferable that an optical surface of the secondary optics is divided into a larger partial area and a smaller partial area, the larger partial area being defined by having a first object-side focal point and the two partial areas having a common image-side focal point at infinity.

As a result, this secondary optics generates an image of the replacement light source at infinity and thus a light distribution in advance of the light module, whose shape of the shape of the intermediate light distribution and thus depends on the shape of the replacement light source and in particular has a sharp cut-off, if such is also present in the intermediate light distribution.

It is also preferred that the concave mirror reflector has a reflective surface, the greater part of which has a parabolic shape, wherein an object-side focal point of the parabolic shape lies on the light exit surface of the primary optics.

The object-side focal point of the reflector is preferably on the edge of the replacement light source. To produce a low-beam light distribution, this is the lower edge of the replacement light source. As described, this edge can also be shaded by a diaphragm to prevent scattered light from entering the dark field of the light distribution.

If the secondary optics has a plurality of reflector facets, their focal points are preferably also located on the edge of the replacement light source. However, depending on the position of the facet, they are preferably positioned at different ends of the light source edge.

Furthermore, it is preferred that the secondary optics consist of two mirrors which are arranged one behind the other in the beam path such that they fold the beam path of the secondary optics twice at an acute angle and that the secondary optics has an object-side focal point which lies on the light exit surface of the primary optics and the latter Pixel lies at infinity.

By folding at an acute angle, the already mentioned advantages of a good sharpness of the cut-off line are achieved, because the acute angle leads to the fact that the orientation of the images of the replacement light source is largely maintained parallel to the cut-off line.

The double folding also opens the possibility to shorten the space of the light module and provides a further degree of freedom for the arrangement of the elements of the light module. As a result, particularly particularly compact light modules can be realized. In addition, it offers constructive advantages when the light source radiates forward in the direction of travel and the heat dissipation of the light source via a heat sink to the rear: Such a light source can be easily changed from the back of the headlight ago. Also, the heat sink on the back of the light module can be easily ventilated, which improves the cooling performance. Due to the compact design, there is the additional advantage that the center of gravity of the light module is located in the vicinity of the light exit surface, which facilitates the mechanical pivoting of the light module for a headlight range control and / or a cornering light function.

The folding of the beam path is also favorable, because the refractive power in the proposed optical system on primary and secondary optics, so that secondary optics with low refractive power, ie with long focal length receives (the focal lengths are 2-3 times greater than single-stage systems). This is advantageous because you get a very tolerancesunempfindliche optics by the very long focal lengths in relation to the opening. All chip images also have approximately the same size and orientation.

It is also preferred that the first mirror in the propagation direction of the light in the beam path has a hyperboloid and the second mirror has a paraboloid as the reflection surface, the object-side focal point of the hyperboloid forming the object-side focal point of secondary optics and the image-side focal point of the hyperboloid coinciding with the focal point of the paraboloid and marks the position of a virtual intermediate image of the intermediate light distribution.

It is also preferable that the secondary optics have a plurality of object-side focal points and one or more common image-side foci or focal lines at infinity.

Furthermore, it is preferred that the first mirror of the two-stage secondary optics comprises a hyperboloid or a plane mirror as a special case of the hyperboloid, and that the second mirror has a faceted paraboloid, wherein the object-side focal point of the hyperboloid forms the object-side focal point of secondary optics and wherein the image-side Focusing the hyperboloid marked the location of a virtual intermediate image of the intermediate light distribution and wherein the downstream parabolic facets are adapted to focus on the edge of the virtual image of the intermediate light distribution.

It is also preferred that the first mirror of the two-stage secondary optics has a faceted hyperboloid or as its special case a faceted plane mirror and that the second mirror has a paraboloid, wherein the object-side focal point of the hyperboloid on the object side Focal point of the secondary optics forms and wherein the image-side focal point of the hyperboloid marks the position of a virtual intermediate image of the intermediate light distribution and wherein the parabolic facets in the beam path focus on the edge of the virtual image of the intermediate light distribution.

A further preferred embodiment is characterized in that the two mirrors have a plurality of object-side focal points, which lie on the edge of the intermediate light distribution and whose pixel or image lines lie on the light-dark boundary of the light distribution at infinity, wherein the two mirror surfaces so are formed so that all the optical paths between the object-side focal point and its respective pixels or image lines are the same length.

In this embodiment, the two mirrors of the two-stage secondary optics are not based on conic sections and provide no sharp, undistorted intermediate image of the replacement light source. However, the optical system has several object-side foci, which lie on the edge of the light exit surface of the primary optics and their pixels or image lines lie on the light-dark boundary of the light distribution at infinity.

An optical system of deflecting optics 64 and secondary optics 12 does not necessarily have to provide a sharp virtual intermediate image 66, since aberrations (blurring, distortion, aperture aberrations) of the intermediate image can be compensated for again by the downstream secondary optics 12.

Further advantages will be apparent from the description and the attached figures.

It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination given, but also in other combinations or in isolation, without departing from the scope of the present invention.

Fig. 1

ein Ausführungsbeispiel eines erfindungsgemäßen Lichtmoduls mit einer unterhalb der Sekundäroptik liegenden Ersatzlichtquelle;

Fig. 2

ein Ausführungsbeispiel eines erfindungsgemäßen Lichtmoduls mit einer oberhalb der Sekundäroptik liegenden Ersatzlichtquelle;

Fig. 3

verschiedene Ansichten einer Baugruppe aus Platine, LEDs und einer Primäroptik mit als Reflektoren verwirklichten Teilbereichen;

Fig. 4

verschiedene Ansichten einer Baugruppe aus Platine, LEDs und einer Primäroptik mit als Sammellinsen verwirklichten Teilbereichen;

Fig. 5

verschiedene Ansichten einer Baugruppe aus Platine, LEDs und einer Primäroptik mit als Lichtleitern verwirklichten Teilbereichen;

Fig. 6

eine perspektivische Darstellung eines Ausführungsbeispiels eines erfindungsgemäßen Lichtmoduls, das einen an einem zusätzlichen Umlenkspiegel gefalteten Strahlengang aufweist;

Fig. 7

den Gegenstand der Fig. 6 mit verschiedenen Ausgestaltungen des Umlenkspiegels, jeweils in einer Seitenansicht;

Fig. 8

Vorderansichten von zwei Ausgestaltungen erfindungsgemäßer Lichtmodule mit Anordnungen der Ersatzlichtquelle gemäß den Alternativen der Fig. 1 und der Fig. 2;

Fig. 9

eine von einem Ausführungsbeispiel eines erfindungsgemäßen Lichtmoduls im Vorfeld des Lichtmoduls erzeugte Abblendlichtverteilung und eine schematische Darstellung von Lichtquellenbildern, aus denen sich die Abblendlichtverteilung zusammensetzt.

Embodiments of the invention are illustrated in the drawings and are explained in more detail in the following description. In each case, in schematic form:

Fig. 1

an embodiment of a light module according to the invention with a lying below the secondary optics spare light source;

Fig. 2

an embodiment of a light module according to the invention with a lying above the secondary optics spare light source;

Fig. 3

various views of an assembly of board, LEDs and a primary optics realized as reflectors sections;

Fig. 4

different views of an assembly of board, LEDs and a primary optics realized as collecting lenses sections;

Fig. 5

different views of an assembly of board, LEDs and a primary optics realized as light guides sections;

Fig. 6

a perspective view of an embodiment of an inventive Light module having a folded at an additional deflection mirror beam path;

Fig. 7

the object of Fig. 6 with different embodiments of the deflecting mirror, each in a side view;

Fig. 8

Front views of two embodiments of light modules according to the invention with arrangements of the replacement light source according to the alternatives of Fig. 1 and the Fig. 2 ;

Fig. 9

a low-beam light distribution produced by an exemplary embodiment of a light module according to the invention in advance of the light module and a schematic representation of light source images, from which the low-beam light distribution is composed.

Like reference numerals refer to the same or at least functionally comparable elements in the figures.

In detail, the shows Fig. 1 a spatial arrangement of a light source assembly 10 and a secondary optics 12 as an embodiment of a light module according to the invention 14. Here, holding structures that define this arrangement in space and fix, for reasons of clarity and because they are neither for the understanding of the invention nor for the feasibility of the invention are of importance, not shown. The presentation of the Fig. 1 is so far concentrated on the optical elements of the light module. This also applies to the other figures.

The light source assembly 10 and the secondary optics 12 are arranged so that they produce a rule-compliant light distribution 16 on a standing in front of the light module screen 17. In the illustrated case, the light distribution 16 has a section-wise horizontally running cut-off line 18.

When the light module 14 is used as intended in a motor vehicle headlight of a motor vehicle which is standing on a level surface, the roadway nearer part 18.1 of the horizontal light-dark boundary runs approximately at the height of the horizon in front of the vehicle or quite easily (as a rule 0, 57 °) below. The point at which the cut-off line bends upwards is roughly in the extension of the vehicle's longitudinal axis. A vertical V passing through this point intersects the horizon H at a point on the screen, also referred to as HV = (0,0). For details of such a light distribution, refer to the explanations FIG. 9 directed.

A sagittal plane 20 and a meridional plane 22 can be assigned to the optical system of the light module 14. The sagittal plane 20 lies parallel to the roadway at the height of the horizon H. The meridional plane 22 is defined by the direction of the vertical V and an optical axis of the light module 14, which passes through the HV = (0,0) point.

The light source module 10 comprises a heat sink 24 and a printed circuit board 26 with SMD LEDs 28 arranged thereon and the associated primary optics. The SMD LEDs with the associated primary optics 30 are shown enlarged as a detail Z.

Due to their design, the SMD LEDs 28 are arranged such that their light exit surfaces do not adjoin one another without spacing. The light emitted by these SMD LEDs 28 is focused by the primary optics 30 so that adjusts to the seamless juxtaposed light exit surfaces of the primary optics 30 a coherently closed light distribution. This intermediate light distribution serving as a substitute light source is subsequently reproduced by the secondary optics 12 as a low-beam light distribution 16 on a screen 17 which is remote from the light module 14. In this case, the lower edge 32 of the primary optics 30 is depicted as a cut-off line of the low-beam light distribution.

The reflector surface of the secondary optics 12 consists of several reflector facets 12.1, 12.2. 12.3, which are realized, for example, at least in areas of their reflection surface as Rotationsparaboloide. In each case, these areas occupy the larger part of the reflection surface of a facet. The paraboloids, which are different for different facets, have different focal points 34, 36, all of which lie on the lower edge 32 of the light exit surface of the primary optics 30. The focal points 34, 36 are preferably located at the corners of the primary optics 30. The meridional plane 22 divides the space of the optical system into two half-spaces. If the light source radiates from below into the secondary mirror, the mirror facets and their focal points lie in the same half space. The axes of the paraboloid of revolution on which the reflector facets are based point in the direction of the dipped beam light-dark boundary 18. In this exemplary embodiment, the light source edge is imaged as a light-dark boundary of the rule-compliant light distribution.

As a representative ray of light in the Fig. 1 In the following, a main beam 38 from the beam path of the light module, which runs in the meridional plane 22, is considered below.

The main emission directions of the individual LEDs are preferably parallel to each other and therefore agree. The considered light beam 38 extends in the main emission direction of the light sources 28 through the lower boundary of the light exit surface of the primary optics 30 and propagates in the direction of the reflector surface of the secondary optics 12. At the reflector surface of the main beam 38 at an acute angle (<90 °) is reflected and at a point the light-dark boundary 18 of the light distribution 16 in the range H = 0 ° steered, the vertical component is usually at V = -0.57 °.

The object of FIG. 2 is different from the subject of the FIG. 1 in that the light source 10 radiates from above into the secondary reflector 12. The meridional plane 22 divides the space of the optical system into two half-spaces. If the light source radiates from above into the reflector, the focal points of the parabolic facets always lie on the other side of the meridional plane like the reflector facet itself, which is in comparison to the FIG. 1 is illustrated by the in detail Y from right to left reversed focal points 34, 36. By the other arrangement of the light source, therefore, the sides of the focus points 34, 36 of the respective reflector facets interchange. Overall shows FIG. 2 likewise an LED low-beam module 14 with asymmetrical cut-off line 18.

The task of primary optics 30 is within the here presented invention in particular to produce a well-defined, streak-free and thus suitable as a replacement light source intermediate light distribution in a plane that is sharply imaged by the secondary optics 12 in the rule-compliant light distribution 18. For this purpose, the primary optics 30, in particular from the light gaps of the SMD LEDs 28 which are not adjacent to one another, must generate a coherently coherent surface.

For this purpose, the SMD LEDs 28 are arranged in one or more parallel rows. An optical array 30 comprising collecting lenses, reflectors or conical light guides is now brought into the beam path in front of the LED array, so that the light exit surface is illuminated as evenly and homogeneously as possible and the emitted radiation beam has no gaps.

FIG. 3 shows a primary optics array 30 of reflectors. The reflector portions 40 are here realized as a distance from each other adjacent recesses of a one-piece body 42. FIG. 3b shows a perspective view of the assembly of the circuit board 26 and the reflector portions 40, which cover the associated LEDs. FIG. 3a shows a section through this assembly, which runs in the direction of the series arrangement. 3d figure shows a section through this assembly, which extends transversely to the array and Figure 3c shows a plan view and a location of said sections.

The reflector subregions have rectangular, in particular square cross sections. The light exit surfaces of the individual reflectors 40 are lined up without gaps and thus without spacing on each other and limit the resulting luminous surface with sharp, straight edges 44. Each SMD LED 28 is associated with a respective reflector 40. The centers of the reflectors 40 and the centers of the light exit surfaces of the light sources 28 have equal distances. The series arrangement of the reflectors 40 therefore has the same pitch as the row arrangement of the LEDs 28.

In one embodiment, a heat shield 46 is disposed between the reflector portions and the LED, which protects the back of the reflector portions 40 of the optical array 30 from radiation. Of course, the heat shield 46 is interrupted over the light exit surfaces of the SMD LEDs 28 to allow light leakage.

especially the FIGS. 3a, 3b and 3d clearly show an array of conically widening toward the light exit towards reflectors 40 with square or rectangular cross-sections, wherein such a cross-section perpendicular to the optical axis and thus perpendicular to the main emission of the LEDs 28 is arranged. The reflector subregions 40 preferably have the illustrated geometry of truncated pyramids. Like in the FIG. 3 is shown, the reflector portions 40 and their respective one-uniquely associated light sources 28 are arranged in one or more rows. In addition, the reflector portions 40 are equal to each other and their light exit surfaces adjoin one another without spacing, so that their light exit surfaces are limited by at least one straight line 44. Fig. 3b in particular also shows a lower edge 44 to be imaged as a light-dark boundary of the light exit surface of the reflector row arrangement. Fig. 4 shows in particular the focal plane 48 of the secondary optics 12, which lies in a plane with the intermediate light distribution, which results as a light exit surface of the reflectors 40.

Fig. 4 shows one of the Fig. 3 comparable subject. In contrast to the subject of FIG. 3 the primary optic array 50 is composed of collecting lenses. The collecting lens subareas 50 are realized here as partitions of an integral transparent base body 52 adjoining each other without any spacing. The one-piece base body 52 is preferably made of one of the above-mentioned materials.

FIG. 3b shows a perspective view of the assembly of the circuit board 26 and the collecting lens portions 50 and the associated LEDs 28th FIG. 3a shows a section through this assembly, which runs in the direction of the series arrangement. 3d figure shows a section through this assembly, which extends transversely to the array and Figure 3c shows a plan view and a location of said sections.

Each light source 28 is uniquely associated with a collection lens portion 50. comparisons Fig. 4c , The lens array is delimited at least on one edge at least in sections by a flat side surface 54 on which a part of the beam path is reflected. This is in the Fig. 4d clearly.

Alternatively, this edge 54 can also be formed by a diaphragm 56, which is brought into the beam path immediately before the light exit surface of the lens array. This is in the 4e and 4f shown.

Figure 4e shows a primary optic array of collecting lenses 50 with additional aperture 56. This covers an edge of the primary optics in order to limit the light exit surface as sharply as possible. This aperture causes a particularly sharp limitation of the light exit surface in that it shadows all light that is scattered past the light exit surface. In this case, the secondary optics focuses as directly as possible on the diaphragm edge. If a low-beam light distribution is to be generated with at least partially horizontally extending cut-off line, the diaphragm edge extends along the lower edge of the light exit surface of the primary optics, with the aid of which the secondary optics then form the light-dark transition of the light distribution.

The intermediate light distribution is in the lens arrays in the region of the lens body. The focus of secondary optics lies in Fig. 4f at the edge of the aperture 54. The lens array design is preferred.

The bezel may also be used in conjunction with the other embodiments of primary optics presented in this application.

Like in the FIG. 4 is shown, the collecting lens portions 50 as well as their respective one-uniquely associated light sources 28 arranged in one or more rows. In addition, the collecting lens sub-areas 50 are equal to each other and their light exit surfaces adjoin one another without spacing, so that their light exit surfaces are limited by at least one straight line 44.

Figure 4g shows an arrangement of a pair of one of a plurality of semiconductor light sources 28 in the form of an LED chip and a collecting lens portion 50 of the main body 52 that collects light of this chip. A pitch of the main body 52 is designated T. The pitch T corresponds to the width of the individual collective lens subregions 50 and to the spacing of the centers of adjacent LED chips 28. B _LED is an edge length of the LED chip 28. A virtual LED chip is labeled 28 '. The edge length of the virtual LED chip 28 'is labeled B' _LED . An object-side focal point of the collection lens portion 50 is F, and a major point of the collection lens portion 50 is H. The principal point H of a lens is defined as the intersection of a principal plane of the lens with the optical axis. The secondary optic 4 of the light module 1 according to the invention is preferably focused on a main point H of one of the collective lens subregions 50, preferably on the main point H of the collective lens subregion 50 located in the vicinity of an optical axis of the light module. Reference f denotes the focal length of the collective lens portion 50, and S _{F is} a sectional width of the collective lens portion 50. A distance between the LED chip 28 and the light entrance surface of the collective lens portion 50 is S ₁ , and a distance between the virtual chip image 28 'and the Light entrance surface of the collecting lens portion 50 is denoted by S ₂ .

$$\mathrm{0},\mathrm{1}\mathrm{mm}\le {\mathrm{S}}_{\mathrm{1}}\le \mathrm{2}\mathrm{mm}$$

$$\mathrm{1}{\mathrm{x\; B}}_{\mathrm{LED}}\le \mathrm{T}\le \mathrm{4}{\mathrm{x\; B}}_{\mathrm{LED}}$$

The LED chip 28 is located between the collecting lens portion 50 and the object-side focal point F. The LED chip 28 is enlarged by the collecting lens portion 50 so that the (upright) virtual image 28 'of the chip (in the light exit direction in front of the object-side lens focal point F) is the same size as the collecting lens portion 50, ie B ' _LED ≈ T. For the given sizes approximate the following relationships: $$\frac{{\mathrm{S}}_{\mathrm{F}}-{\mathrm{S}}_{\mathrm{1}}}{{\mathrm{S}}_{\mathrm{F}}}\approx \frac{{\mathrm{B}}_{\mathrm{LED}}}{\mathrm{T}}\approx \frac{{\mathrm{B}}_{\mathrm{LED}}}{{\mathrm{B\; \text{'}}}_{\mathrm{<figure-callout\; id="0"\; label="LED"\; filenames="imgf0011.png"\; state="\{\{state\}\}">LED</figure-callout>}}}$$

$$\mathrm{0}.\mathrm{1}\mathrm{mm}\le {\mathrm{<figure-callout\; id="1"\; label="S"\; filenames="imgf0001.png,imgf0003.png"\; state="\{\{state\}\}">S</figure-callout>}}_{\mathrm{1}}\le \mathrm{2}\mathrm{<figure-callout\; id="1"\; label="mm"\; filenames="imgf0001.png,imgf0003.png"\; state="\{\{state\}\}">mm</figure-callout>}$$

$$\mathrm{1}{\mathrm{x\; B}}_{\mathrm{LED}}\le \mathrm{T}\le \mathrm{4}{\mathrm{x\; B}}_{\mathrm{LED}}$$

The collecting lens subregions 50 of the base body 52 do not serve to produce real intermediate images of the light sources 28, but merely form an illuminated surface on the light exit side 25 of the collecting lens subregions 50. The light sources 28 are arranged between the light entry surfaces of the collecting lens subregions 50 and the object side focal points F of the collecting lens subregions 50 in that the edges of the light sources 28 lie on geometric connections from the focal points F to the lens edges. The emitting surfaces of the light sources 28 are arranged perpendicular to the optical axes of the collecting lens portions 50. This results in a very uniform illumination of the collecting lens subregions 50, and on the light exit surfaces of the collecting lens subregions 50 results in a particularly homogeneous light distribution, the so-called. Intermediate light distribution. These intermediate light distributions are imaged by the secondary optics for generating the resulting total light distribution of the light module on the roadway in front of the vehicle. The optical axes of the individual collecting lens subregions 50 of the main body 52 all run in one plane, preferably they are parallel to one another. The secondary optics axis is on the side facing the main body 52 The LEDs are in particular arranged between their respective collecting lens portion and its paraxial focal point so that a gapless intermediate light distribution is formed, which is composed of the virtual images of the light exit surfaces of the individual chips. It should be noted that the light exits from the LED first in air and only then incident on the associated collection lens portion. This is a difference from the prior art, in which LEDs are used with transparent potting compounds, wherein the potting possibly develops a lens effect.

Fig. 5 shows a further embodiment of the primary optic array. In the case of Fig. 5 consists of the primary optics array of optical fibers 60 with conically widening toward the light exit cross sections, which are oriented perpendicular to the main propagation direction of the light in the optical fibers and thus perpendicular to the respective optical axis and which are rectangular, in particular square. The light exit surfaces 62 of the individual light guides 60 line up seamlessly and limit the luminous surface with sharp, straight edges 44 which are lower edges 44 here. Each LED 28 is assigned one light guide 60 one-uniquely.

The light entry surface is preferably flat and is parallel in front of the LED chip. The light guides 60 are arranged like the associated light sources in one or more rows, so that the light exit surfaces are in turn bounded by at least one straight line 44. The light exit surface is preferably convex. The optical fiber array is preferably one of the above made of these materials. The light guide array is preferably manufactured as a one-piece base body, which has the light guides as light-conducting subregions.

For all three embodiments of the primary optics array as an array of reflector subregions 40, condenser lens subregions 50 and light guide subregions 60, the sum of the light exit surfaces of the respective subregions forms the coherently connected intermediate light distribution and substitute light source.

Neglecting losses due to absorption and Fresnel reflection, the replacement light source has luminances similar to those of the individual LEDs. Thus even such a replacement light source has uniformly distributed luminances and similar emission angles over its entire light exit surface, such as individual LEDs. In the following, the replacement light source can be treated like an LED array.

The light distribution thus formed now serves as a replacement light source for a downstream secondary optics, which is a converging lens or preferably a reflector with at least partially parabolic reflection surface and forms a low beam distribution using this replacement light source.

The substitute light source should be oriented as similar as possible to the light-dark border of the low-beam light distribution (namely at least in sections horizontally) in order to achieve a good sharpness of the cut-off line (high illuminance gradient). For this reason, all reflectors in the beam path are arranged so that the beam path at the respective reflectors always in folded as possible at an acute angle (<90 °) and the orientation of the images of the replacement light source is largely maintained parallel to the cut-off line.

Preferably, the secondary optics is a faceted parabolic reflector. The reflector is arranged in the beam path so that the replacement light source radiates from the front into the reflector, so that the beam path is deflected at an acute angle. The at least one focal point of the reflector lies on the edge of the replacement light source. To produce a low-beam light distribution, this is the lower edge of the replacement light source. As described, this edge can also be shaded by a diaphragm to prevent scattered light from entering the dark field of the light distribution.

• Strahlt die Lichtquelle von unten in den Reflektor, so haben die jeweiligen Parabelfacetten ihren Brennpunkt immer im selben von der Meridionalebene begrenzten Halbraum.
• Strahlt die Lichtquelle von oben in den Reflektor, liegen die Brennpunkte der Parabelfacetten immer auf der anderen Seite der Meridionalebene wie die Reflektorfacette selbst.

If the secondary optics has a plurality of reflector facets, their focal points are again on the edge of the replacement light source, but depending on the position of the facet are preferably positioned at different ends of the light source edge:

• If the light source radiates from below into the reflector, the respective parabolic facets always have their focal point in the same half space bounded by the meridional plane.
• If the light source radiates from above into the reflector, the focal points of the parabolic facets always lie on the other side of the meridional plane, just like the reflector facet itself.

This ensures that the images from the replacement light source always connect to the nearest corner at the low beam cut-off line and no part of the light source images into the dark field of the Light distribution protrudes.

The secondary optics does not focus on the chip level of the LEDs but on the lower edge of the light emission surface of the primary optics. The light exit surface can be particularly sharply defined when along the edge of the light exit surface, a diaphragm is arranged, which shadows all light that is scattered past the light exit surface.

In this case, the secondary optics focuses as directly as possible on the diaphragm edge. If a low-beam light distribution is to be generated with at least partially horizontally extending cut-off line, the diaphragm edge extends along the lower edge of the light exit surface of the primary optics, with the aid of which the secondary optics then form the light-dark transition of the light distribution.

The reflector surface of the secondary optics preferably consists of a plurality of reflector facets, each of which has surfaces realized as paraboloid of revolution. The various paraboloids have different focal points, all of which lie on the lower edge of the light exit surface of the primary optics, preferably at their edges (corners), the focal points lying in the same hemisphere as the associated facet surfaces.

The axes of the paraboloid of revolution on which the reflector facets are based point towards the low beam cut-off. Thus, the light source edge is displayed as a light-dark boundary of the light distribution.

In one embodiment, the reflector facets are executed as toroidal surfaces instead of as rotational paraboloids. For this purpose, the curvature of the paraboloid of revolution is thus increased or reduced in sections parallel to the light-dark boundary (or to sections of the light-dark boundary) by the focal point of the paraboloid in that, instead of the focal point, a focal line results which runs parallel to the low-beam light-dark boundary or to portions of the low-beam light-dark boundary. The scattering can also be achieved by scattering cylinder optics, which are applied to the facet surfaces and whose cylinder axis are perpendicular to main beam and low beam light-dark boundary.

If an asymmetrical low-beam light-dark boundary with an increase is to be generated, then this increase is produced via a reflector facet which is as close as possible to the edge of the reflector surface. Details will be provided below with reference to Fig. 8 explained.

FIG. 6 shows embodiments of inventive light modules 14, which have a deflection mirror, which additionally folds the beam path. This measure serves to shorten the installation space of the light module and to provide a further degree of freedom in order to arrange the elements of the light module as freely as possible.

Thus, it offers constructive advantages when the light source 10 in the direction of travel (light emission direction) radiates forward and the cooling of the light source via a heat sink 24 to the rear: Such a light source can be easily changed from the back of the headlight. Also can be the Ventilate the heat sink on the back of the light module more easily, which improves the cooling performance. In addition, a compact light module is obtained whose center of gravity lies in the vicinity of the light exit surface, which facilitates the mechanical pivoting of the light module 14.

The folding of the beam path is also favorable, because the refractive power in the proposed optical system is divided into primary and secondary optics, so that secondary optics with low refractive power, i. with long focal length (the focal lengths are 2-3 times greater than single-stage systems).

The deflecting mirror 64 is designed as a hyperboloid, wherein the hyperboloid should explicitly include the special case of the plane mirror. The described properties of the secondary optics 12 in this case relate to the optical system 64, 12 of deflection mirror 64 and secondary optics 12, which now focuses with one or more focal points on the lower edge of the replacement light source. The deflection mirror 64 generates at least one virtual intermediate image 66 of the replacement light source 68.

In this case, the replacement light source 68 lies in the object-side Petzval surface of the hyperbolic deflection mirror, while the focal point (s) of the secondary optics 12 lie in the image-side Petzval surface of the hyperboloid, i. the secondary optics 12 focus on their virtual image 66 instead of the real substitute light source 68.

6a shows such a low beam module 14 with an additionally folded by a deflection mirror 64 beam path. The deflection mirror 64 generates a virtual image 66 of the replacement light source 68. The focal points of the Secondary optics 12 are as described in connection with the FIG. 1 has been explained, preferably on the corners of the primary optics. In the case of Fig. 6a However, the secondary optics does not focus on the real primary optics, but on the corners of the virtual image of the primary optics serving as a substitute light source 66.

Figure 6b also shows a low-beam module 14 with an additionally folded by a deflection mirror 64 beam path. The deflection mirror 64 generates a virtual image 66 of the replacement light source 68. The focal points of the secondary optics 12 are now on the lower edge 44 of the virtual image 66 of the replacement light source 68. The deflection mirror 64 shortens the overall length and thus enables a particularly compact construction of the light module 14.

für alle optischen Wege s_i gilt, welche die objektseitigen Brennpunkte 34, 36 der durch den zusätzlichen Umlenkspiegel 64 zweiteiligen Sekundäroptik mit dem gemeinsamen, im Unendlichen liegenden objektseitigen Brennpunkt verbinden. In einer Ausgestaltung weist wenigstens einer der beiden Spiegel eine oder mehrere Facetten auf.The optical system of deflecting optics 64 and secondary optics 12 is preferably designed such that the condition $\underset{i}{\overset{n}{\Sigma }}{s}_i\cdot n_i=\mathrm{constant}$

for all optical paths s _i applies, which connect the object-side focal points 34, 36 of the secondary optics, which are divided by the additional deflecting mirror 64, with the common object-side focal point located at infinity. In one embodiment, at least one of the two mirrors has one or more facets.

erfüllt, muss nicht zwingend ein scharfes virtuelles Zwischenbild 66 liefern, da Aberrationen (Unschärfe, Verzeichnung, Öffnungsfehler) des Zwischenbildes durch die nachgeschaltete Sekundäroptik 12 wieder ausgeglichen werden können.An optical system of deflection optics 64 and secondary optics 12, which is the condition $\underset{i}{\overset{n}{\Sigma }}{s}_i\cdot n_i=\mathrm{constant}$

does not necessarily have to deliver a sharp virtual intermediate image 66, since aberrations (blurring, distortion, aperture aberration) of the intermediate image can be compensated for again by the downstream secondary optics 12.

With respect to the deflection mirror 64, five embodiments are distinguished. In a first embodiment, the deflection mirror 64 is a plane mirror. This is in the Fig. 6 shown.

Figure 7a shows a second embodiment with a deflection mirror 64 which is concave and therefore has a collecting effect. The shape is preferably a hyperbolic shape. Here, due to the collecting characteristic, the intermediate virtual image 66 is an enlarged image of the spare light source 68. The first hyperbola focus point 70 lies on the lower edge of the real primary optics of the real substitute light source 68. The second hyperbola focus point 72 lies on the lower edge of the virtual intermediate image 66 of the substitute light source.

Figure 7b shows a third embodiment with a deflection mirror 64 which is convex and therefore has a dissipative effect. The shape is preferably a hyperbolic shape. Because of the dissipating characteristic, the intermediate virtual image 66 here is a reduced image of the substitute light source 68. The first hyperbola focus point 70 lies on the lower edge of the real primary optics of the real substitute light source 68. The second hyperbola focus point 72 lies on the lower edge of the virtual intermediate image 66 of the substitute light source 68.

The FIG. 7 shows insofar embodiments with a hyperboloid as a deflection mirror 64 having an object-side focal point 70 and a image-side focal point 72 and having a preferably faceted secondary optics, which has the deflection mirror and the further mirror 12, and the plurality of object-side focal points and a image-side focal point at infinity , The Focal points of this secondary optics 12 lie on the lower edge of the virtual image 66 of the replacement light source 68. This image is enlarged or reduced in contrast to the plane mirror, depending on whether the deflection mirror 64 is a concave or a convex hyperboloid.

In a fourth embodiment, not shown, the light module has a plurality of planar Umlenkspiegelfacetten and a secondary optics with a single object-side focal point. The faceted deflecting mirror splits the beam path of the secondary optics, creating an optical system with multiple focal points, similar to a faceted parabolic reflector. The faceted deflection mirror generates several mutually shifted virtual images of the replacement light source. The focal points of the two-part secondary optics focus on the edge of the replacement light source as described above.

In a fifth embodiment, also not shown, the light module has a faceted hyperboloid as a deflection mirror with an object-side and a plurality of image-side focal points. The secondary optics in this case should have an object-side and a image-side focal point (the latter at infinity). The faceted hyperboloid generates mutually displaced, magnified (concave hyperboloidal mirrors) or reduced (convex hyperboloidal) virtual images of the light source, depending on whether the hyperboloidal mirror is concave (and thus enlarging) or convex (and thus downsizing).

FIG. 8 shows front views of embodiments of the Light module, as they offer a viewer who is located in the direction of the light module in front of the light module and looks into the light module. Both in the case of FIG. 8a as well as in the case of Fig. 8b For example, the reflector serving as secondary optics has a parabolic shape with three facets, at least in a region of its reflector surface that is larger than half of its entire reflecting surface.

FIG. 8a FIG. 2 shows, in particular, an embodiment in which the facet 12.1 generates the asymmetrical increase 18.2 of the light-dark boundary in the light distribution 16 on the right edge of the reflector in the viewing direction. In particular, the facet 12.1 is arranged such that the light source images are tilted in the direction of the rise. As a result, the facet 12.1 generates light source images with an orientation that produce the desired increase in the light-dark boundary in the sum of the light source images. That in the Fig. 8a example shown is suitable for legal transactions. Emits the light source as with the subject of the Fig. 8a from below into the reflector, the facet 12.1 does not lie on the same side of the meridional plane as the slope 18.2. The facet edge runs in sections perpendicular to the rise.

FIG. 8b shows in particular an embodiment in which the facet 12.3 on the left edge of the reflector produces the asymmetrical rise of the light-dark boundary in the light distribution. Emits the light source as with the subject of the Fig. 8b from the top into the reflector, the facet 12.3 lies on the same side of the meridional plane as the slope 18.2 itself. The facet edge runs in sections perpendicular to the rise.

FIG. 9b shows a low beam distribution of an embodiment of a light module according to the invention, as it adjusts to a standing in front of the vehicle screen. The horizontal line H is at the height of the horizon. The vertical line V crosses the horizon in the extension of the main emission direction of the light module. The deviations from the point HV = (0, 0) are given in degrees. Closed curves are each lines of constant brightness, with the brightness increasing from line to line from outside to inside. The increase to the right of the HV = (0, 0) point shows that it is a light module for right-hand traffic.

FIG. 9a illustrates how the in the Fig. 9b shown light distribution as a superposition of light source images 74 results. Each light source image is generated by a small part of the reflective surface of the secondary optics. The presentation of the Fig. 9a is purely schematic in this respect. The light source images are predominantly oriented horizontally or parallel to the light-dark boundary. On the other hand, the facet producing the slope is just designed to provide light source images whose edge is parallel to the desired slope of the slope.

The primary optics increase the light exit surface by a factor that corresponds approximately to the quotient of the division of the optical array and the side length of a single chip. This follows from the uniformly bright replacement light source. The focal length of the secondary optics preferably corresponds to 50 times to 200 times the side length of a single chip, in particular 80 times to 100 times the said side length.

Claims (15)

Light module (14) of a motor vehicle headlight, with a plurality of LEDs as light sources (28), a primary optic (30) and a secondary optics (12), wherein the primary optics is adapted to collect from the light sources outgoing light and in an intermediate light distribution (68) which has the shape of a closed luminous surface, and wherein the secondary optics has an object-side focal length, the primary optics and the secondary optics are arranged so that the intermediate light distribution at a distance of this focal length in the light path before the secondary optics, characterized in that the primary optics is a one-piece, composed of collective lens sub-areas basic body, and that the chip of a light emitting diode between a light of this light-collecting collection lens portion and the object-side focal point is located, wherein light exit surfaces of the light sources (28) separated by spaces between them and that the primary optics is arranged to distribute light emanating from the light sources so that the distances in the intermediate light distribution (68) are not recognizable. Light module (14) according to claim 1, characterized in that the primary optics (30) for each Light source has its own optically effective portion, each of which has a light exit surface and wherein these light exit surfaces adjoin one another without spacing, and wherein at least two adjacent light exit surfaces adjacent to each other so that at least one side edge of a first of two adjacent light exit surfaces in line with a side edge the second of the two adjacent light exit surfaces, so that the two aligned edges form a common, straight edge (44). Light module (14) according to claim 2, characterized in that each subregion is a converging lens (50). Light module (14) according to claim 2, characterized in that each subregion is a reflector (40). Light module (14) according to claim 2, characterized in that each subregion is a light guide (60). Light module (14) according to any one of the preceding claims, characterized in that the light module has a diaphragm (56) which is arranged in the beam path of the light immediately behind the light exit surface so that it shadows a portion of the intermediate light distribution. Light module (14) according to one of the preceding claims, characterized in that the secondary optics has at least one concave mirror reflector (12). Light module (14) according to claim 7, characterized in that an optical surface of the secondary optics is divided into a larger partial area and a smaller partial area, wherein the larger partial area is defined by having a first object-side focal point and that the two partial areas have a common have pictorial focal point at infinity. Light module (14) according to claim 7, characterized in that the concave reflector has a reflecting surface, the greater part of which has a parabolic shape, wherein an object-side focal point of the parabolic shape lies on the light exit surface of the primary optics. Light module (14) according to claim 7, characterized in that the secondary optics consists of two mirrors, which are arranged one behind the other in the beam path, that they fold the beam path of the secondary optics twice at an acute angle and that the secondary optics has an object-side focal point on the light exit surface of the primary optics is located and whose pixel lies at infinity. Light module (14) according to claim 10, characterized in that in the propagation direction of the light in the beam path first mirror (64) is a hyperboloid and the second mirror is a paraboloid (12), wherein the object-side focal point of the hyperboloid forms the object-side focal point of the secondary optics, and the image-side focal point of the hyperboloid coincides with the focal point of the paraboloid and marks the position of a virtual intermediate image of the intermediate light distribution. Light module (14) according to one of the preceding claims, characterized in that the secondary optics has a plurality of object-side focal points and one or more common image-side foci or focal lines at infinity. Light module (14) according to claim 10 or 11, characterized in that the first mirror (64) of the two-stage secondary optics is a hyperboloid or a plane mirror as a special case of hyperboloid, and that the second mirror (12) is a faceted paraboloid, wherein the the object-side focal point of the hyperboloid forms the object-side focal point of secondary optics and wherein the image-side focal point of the hyperboloid marks the position of a virtual intermediate image of the intermediate light distribution and wherein the downstream parabolic facets are adapted to focus on the edge of the virtual image of the intermediate light distribution. Light module (14) according to claim 10 or 11, characterized in that the first mirror (64) of the two-stage secondary optics is a faceted hyperboloid or as its special case a faceted plane mirror and that the second mirror (12) is a paraboloid, wherein the object-side focal point of the hyperboloid forms the object-side focal point of the secondary optics and wherein the image-side focal point of the hyperboloid marks the position of a virtual intermediate image of the intermediate light distribution and wherein the parabolic facets in the beam path focus on the edge of the virtual image of the intermediate light distribution. Light module (14) according to claim 10 or 11, characterized in that the two mirrors (64, 12) have a plurality of object-side focal points which lie on the edge of the intermediate light distribution and whose image points or image lines lie at the light-dark boundary of the light distribution at infinity, the two mirror surfaces being shaped that all optical paths between the object-side focal point and its respective pixels or image lines are the same length.

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