EP3671014B1 - Led headlight module and led light module for use in such an led headlight module - Google Patents

Description

The present invention relates to an LED headlight module according to the preamble of claim 1, preferably for use in a motor vehicle to generate a main light function, and an LED light module for use in such an LED headlight module. The invention also relates to a method for installing an LED light module of an LED headlight module on an optical unit of the LED headlight module that is separate from the LED light module, according to the preamble of claim 18. In the known LED light modules for headlights, the LED light sources are in usually not interchangeable or only interchangeable with considerable effort. In addition, mounting the LED light module in the correct position on the optics unit during the production of LED headlight modules is very complex and error-prone.

An LED headlight module of the type mentioned with interchangeable LED light sources is for example U.S. 2015/ 308 652 A1 known. The heat sink is designed in two parts, with a deflection element in the form of a reflector being fastened to a first part of the heat sink, for example by means of screws, and an LED light source being fastened and electrically contacted to the other part of the heat sink. The two parts of the heat sink have mutually complementary positioning and fastening means, so that the two parts can be arranged in a defined position relative to one another during assembly and can be detachably fastened to one another by means of an adapter designed as a metal clip. In order to be able to achieve the required positioning accuracy of the LED light source relative to the deflection element, the positioning and fastening means must be located directly on or in the two parts of the heat sink be trained. The metal bracket only causes one part of the heat sink to be held in place relative to the other part of the heat sink in a vertical z-direction, after they have been positioned accurately in an xy plane by the positioning means.

It is disadvantageous that the heat sink is designed in two parts in order to achieve an exchangeability of the light source. This reduces the efficiency of the heat sink and increases the number of parts. In addition, the need to fasten the deflection element to one part of the heat sink by means of screws results in increased assembly work. Another disadvantage of the known LED headlight module is that the positioning pins and the corresponding positioning indentations have to be formed on or in the two parts of the heat sink. Due to the design, both parts of the heat sink must be designed as die-cast aluminum parts, which results in increased costs.

Furthermore, from the post-published DE 10 2017 122 560 an LED headlight module is known in which an LED light source can be exchanged as part of an LED light module. Precisely positioned assembly of the LED light module with respect to an optical unit with a deflection element is possible without additional or separate assembly devices by simply clipping or latching the complete LED light module onto the optical unit. By simply unlocking the clip or snap-in connection, it is also possible to dismantle or replace the LED light module.

For assembly, the LED headlight module from the DE 10 2017 122 560 the LED light module is placed obliquely on a front edge of a base plate of the optics unit directed in the light exit direction, so that the front edge engages in undercuts formed on the light module, which hold the light module on the optics unit in the z-direction. The light module is then pivoted downwards about an axis of rotation, which is formed by the front edge of the base plate held in the undercuts, so that the rear edge of the base plate also moves with it latching hooks formed on the light module engage, which also hold the light module on the optical unit in the z-direction. At the same time, a spring element acting on the rear edge of the base plate presses the light module or stop elements attached to it against a referencing geometry formed on the front edge of the base plate, so that the light module is also precisely fixed in a defined position in the xy plane.

The problem here, however, is the relatively large amount of space required for the pivoting movement of the light module relative to the optics unit during assembly or disassembly. Furthermore, when the optical unit is placed at an angle on the front edge of the base plate and when the front edge of the base plate is inserted into the undercuts, the reflector can be damaged in the visible area (e.g. scratching or damage to a reflective surface of the reflector). Finally, the spring travel of the latching hooks and the spring element must be relatively short for reasons of space, so that the latching hooks and the spring element can be overstretched when the light module is mounted on the optics unit.

Finally is out of the EP 2 915 698 A1 an LED headlight module is known, in which an LED circuit board - in particular for replacing the LED bulbs - positioned in a simplified manner relative to an associated reflector and thus the entire LED module can be mounted more easily.

Based on the prior art described, the present invention is therefore based on the task of proposing an LED headlight module with a replaceable LED light source, in which on the one hand assembly and disassembly is possible easily, quickly and with as little space as possible and on the other hand the LED Light source is held as accurately as possible after assembly, safe and reliable with respect to an optical unit of the headlight module.

To solve this problem, an LED headlight module for a motor vehicle headlight is proposed with the features of claim 1, the use of an LED light module provided in an LED headlight module with the features of claim 16 and a method for assembly with the features of claim 17.

In particular, an LED headlight module is proposed that includes an LED light module and an optical unit that is separate from the LED light module. The LED light module has a board on which at least one LED light source for emitting light is attached and electrically contacted, and an adapter separate from the board for detachably attaching the LED light module to the optics unit. The optics unit has at least one optical deflection element for bundling and deflecting at least part of the emitted light in a light exit direction of the LED headlight module. The circuit board and the adapter are at least indirectly rigidly attached to one another. The LED light module has at least one stop element, which is arranged and designed on the LED light module in such a way that it enables the LED light module to be positioned precisely relative to the optics unit in an xy plane by using a corresponding referencing geometry of the optics unit. The adapter comprises at least one spring element which, when the LED light module is mounted, presses the at least one stop element of the LED light module for precise positioning of the LED light module in the xy plane against the referencing geometry of the optics unit. The adapter also has a fastening arrangement for the detachable fastening of the LED light module, which is positioned precisely, in the z-direction on the optics unit. The fastening arrangement comprises at least one first holding element which is articulated on the adapter in an articulation area and has a holding arm which is resilient in a z-direction and an active surface which is formed thereon and which essentially extends in a plane parallel to the xy plane and which holds the precisely positioned LED Light module holds in the z-direction on the optics unit. The effective surface acts on a sub-area of the optics unit which, when the LED light module is positioned precisely, lies opposite the sub-area of the optics unit on which the at least one stop element acts.

The LED light module of the LED headlight module according to the invention comprises a circuit board and an adapter for fastening the LED light module to the optics unit of the LED headlight module. The deflection element of the optics unit is, for example, a reflector with a specular reflection surface on a surface in the light exit direction directed side of the reflector formed. The adapter can be made of plastic or a metal sheet, in particular a spring steel sheet. The adapter can also consist of a material mix or of several components made of different materials (e.g. plastic and spring steel). The LED light module preferably also includes a heat sink, preferably in the form of a one-piece bent sheet metal part, for example made of spring steel sheet.

The adapter and circuit board are rigidly attached to each other. They are preferably attached together to a heat sink of the LED light module. For example, the adapter can be attached to a heat sink by means of screws or in some other way, with the circuit board being clamped between the adapter and the heat sink. Since the circuit board, the adapter and the heat sink are then rigidly connected to one another, the various elements for the precise positioning and attachment of the LED light module relative to the optics unit could in principle be formed or arranged on any part (circuit board, adapter or heat sink) of the light module . The adapter can be manufactured easily and inexpensively and can be provided with suitable elements without any problems, which enable the LED light module to be positioned and/or fastened to the optics unit in a precise position. This results in a particularly simple and cost-effective construction of the LED light module.

The fastening arrangement also has at least one second holding element which is articulated on the adapter in an articulation area and has a holding arm which is resilient in a z-direction and an active surface formed thereon which essentially extends in a plane parallel to the xy plane and which positions the precisely positioned Holds the LED light module in the z-direction on the optics unit, with the effective surface acting on a portion of the optics unit which, when the LED light module is positioned precisely, is between the portion of the optics unit on which the at least one first holding element acts and the portion of the optics unit , on which the at least one stop element acts. The second holding elements differ from the first holding elements in particular in that they act on different partial areas of the optical element to hold the LED light module securely in the z-direction on the optical element in a detachable manner. While the effective surface of the at least one first holding element tends to act in an edge area on a surface of the base plate of the optical unit, the effective surface of the at least one second holding element tends to act on the surface of the base plate at a distance from the edge area due to the longer holding arms.

According to a preferred embodiment of the invention, it is proposed that all retaining elements that detachably fasten the precisely positioned LED light module to the optical unit in the z-direction are articulated on the same side of the adapter in the articulation area on the adapter.

In the case of the LED headlight module according to the invention, the LED light module is preferably placed diagonally from behind onto a rear edge of a base plate of the optics unit. The light module is pressed with little force in the direction of the front edge of the base plate (in the light exit direction of the headlight module) against the force of the at least one spring element until the at least one stop element is pushed over the referencing geometry of the optical unit on the front edge of the base plate and the LED light module can be pivoted about an axis of rotation running along the rear edge of the base plate. When the LED light module is placed on the optics unit, the resilient retaining arm of the retaining element(s) slides with its active surface, starting from the rear edge of the baseplate, along the underside of the baseplate until it reaches the subarea of the baseplate via which it acts on the optics unit and due to its spring effect, the LED light module and the optics unit are pressed against each other in the z-direction. The spring force of the at least one spring element presses the at least one stop element of the LED light module against the referencing geometry of the optics unit, so that the LED light module is positioned and held in the exact position relative to the optics unit in the xy plane as well.

With the LED headlight module according to the invention, it is possible to mount the LED light module in a particularly simple and precisely positioned manner with respect to the optics unit or the deflection element without additional or separate mounting devices. In addition, a simple dismantling or a simple replacement of the LED light module is possible. It is particularly advantageous that only a very small space is required for the pivoting movement for the assembly and disassembly of the light module. Furthermore, there is no damage to the reflector in the field of vision (e.g. in the area of a reflecting surface or visible panels), since the light module is placed on the rear edge of the base plate of the optics unit, which is outside the field of vision. Finally, the holding arm of the holding element or elements is designed to be resilient in the z-direction, with the spring deflection of the holding arm being designed to be relatively long, so that overstretching of the holding arm of the holding element or elements is ruled out when the LED light module is mounted on the optics unit.

The LED headlight module according to the invention has a robust referencing geometry (see, for example, also the DE 10 2016 119 792 A1 ) for precise referencing of the LED light module relative to the optics unit in an xy plane. The referencing geometry is formed on the optics unit, preferably on a front edge of a base plate of the optics unit, and interacts with the stop elements that are formed on the LED light module. The stop elements are preferably integrated into or attached to the adapter which is attached to the LED light module. If the adapter is made of plastic, the stop elements can be formed at the same time as part of the production of the adapter, for example by means of injection molding. Alternatively, the stop elements can also be arranged or formed on the circuit board. For this it is conceivable to insert suitable referencing pins through holes in the circuit board and to attach them to the circuit board. The referencing pins can be fastened by means of a press fit, by means of screws or in some other way. Alternatively, a referencing part made of plastic, which has appropriate referencing surfaces that act as stop elements, can also be attached to the circuit board, the adapter, or the heat sink. In doing so, it is advantageous if the referencing part is attached to the heat sink of the light module, for example by means of a common screw together with the adapter and the circuit board.

The referencing geometry of the optics unit is designed, in cooperation with the stop elements of the LED light module, to position this in an xy plane relative to the optics unit in a precise position. The referencing geometry is preferably formed on a front edge of a base plate of the optics unit. The referencing geometry includes, in particular, a first stop surface that acts in the x-direction and extends in the y-direction, as well as two further stop surfaces that are offset in the y-direction from the first stop surface and are in a V-shape with respect to one another, each in the x- and in y-direction. The first stop surface of the referencing geometry interacts with a corresponding first stop element of the LED light module. The two other stop surfaces which are in a V-shape with respect to one another interact with a corresponding other stop element of the LED light module.

The LED light module is pre-assembled by attaching the adapter to the heat sink together with the circuit board. This can be done in particular by means of screws. When the adapter is attached to the heat sink, the circuit board can be clamped between the adapter and the heat sink and can thus be attached indirectly to the adapter and the heat sink. It is also conceivable that the circuit board is attached to the heat sink independently of the adapter, for example by means of at least one screw. Integrated into the adapter are both positioning means for the precise positioning of the adapter relative to the LED light source or the printed circuit board and the stop elements, which interact with the referencing geometry for precise positioning relative to the optical unit. In addition, the at least one spring element and the holding arms of the first and—if present—the second holding elements are designed in one piece with the adapter. If the LED light module is precisely positioned relative to the optics unit with the deflection element in the xy plane and properly positioned and held in the z direction, the LED light source is in the required position and orientation relative to the deflection element (e.g. the reflecting surface of one Reflector) so that the LED headlight module can generate the intended light distribution.

Alternatively, it is also conceivable, particularly in the case of an adapter made of spring steel, for parts of the adapter, e.g Pre-assembly of the LED light module to attach the adapter together with the circuit board to the heat sink in a different way than by one or more screws.

The preassembled LED light module is then manually placed at an angle on the optics unit, pivoted relative to it and then automatically held in the precisely defined position on the optics unit by means of the holding arm of the holding element or elements. When the LED light module is placed on the optics unit, in particular on the rear edge area of a base plate of the optics unit, the LED light module performs an approximately translatory movement in a positive x-direction and approximately parallel to a surface extension of the base plate of the optics unit until the stop elements of the LED light module are located in front of the referencing geometry of the optics unit, so that the optics unit can then be pivoted as part of the pivoting movement about an axis of rotation that is formed approximately by the rear edge area of the base plate. The stop elements come into active engagement with the referencing geometry. The axis of rotation preferably runs parallel to the y-axis, with a front section of the light module moving in the direction of the optics unit as part of the pivoting movement. A spring force of the at least one holding arm of the holding element or elements acts in the direction of the pivoting movement. After the end of the pivoting movement, the circuit board of the light module preferably runs parallel to the base plate of the optics unit.

The light module can now be released, in which case two things happen in particular: the at least one spring element presses the at least one stop element of the LED light module against the referencing geometry of the Optical unit (thus ensuring an accurate positioning of the light module relative to the optical unit in the xy plane) and the at least one holding arm, which is resilient in the z-direction, of the holding element(s) presses the light module and the optical unit against one another (and thus ensures accurate positioning in z-direction). The LED light module is thus positioned and held in three-dimensional space relative to the optics unit.

The LED headlight module not only has the advantage that a defective LED light source (together with the LED light module) can be replaced, but also that the LED headlight module can be installed by the manufacturer of the headlight module, in particular the correct and precise attachment of the LED light module on the optics unit, can be carried out quickly and reliably even by unskilled persons or even fully automatically using an assembly robot. In the context of the present invention, the concept of location includes both a position and an alignment of the light module relative to the optical unit.

During disassembly of the LED headlight module, a translational movement of the light module relative to the optics unit in the positive x-direction is performed against the spring force of the at least one spring element, so that the stop elements stand out from the referencing geometry. A pivoting movement of the light module relative to the optics unit is then carried out about the axis of rotation, with a front section of the light module moving away from the optics unit as part of the pivoting movement. The spring force of the at least one holding arm of the holding element or elements acts against this pivoting movement. As soon as the at least one stop element is located above the base plate of the optics unit during the course of the pivoting movement and the at least one stop element is no longer in active engagement with the referencing geometry, the LED light module is moved in an approximately translatory movement in a negative x-direction and moves approximately parallel to a surface extension of the base plate of the optics element until the effective surface of the at least one holding arm of the holding element or elements is no longer in contact with the Optical unit is in contact. Then the light module can be removed from the optics unit and replaced.

In the case of the present invention, no holding or spring elements or other fastening or holding elements are provided which encompass or hold the front edge of a base plate of the optics unit. All holding or spring elements are in operative connection with the rear edge of the base plate or at most a partial area of the base plate between the rear and the front edge. The at least one spring element and the at least one holding arm of the holding element(s) are preferably articulated on the adapter on its side pointing backwards when the LED light module is in the installed state in the articulation area in such a way that they are arranged next to one another, in particular in the y-direction. No holding or spring elements whatsoever are arranged on the forward-facing side of the adapter. This allows the pre-assembled LED light module to be slid onto the rear edge of the base plate of the optics unit from behind and then swiveled around the axis of rotation that runs approximately along the rear edge of the base plate, with the LED light module still being positioned precisely and securely at the end of the swivel movement and is reliably positioned and held on the optical unit.

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

Figur 1

ein erfindungsgemäßes LED-Lichtmodul gemäß einer ersten bevorzugten Ausführungsform in einer perspektivischen Ansicht von vorne und unten;

Figur 2

einen Ausschnitt eines erfindungsgemäßes LED-Scheinwerfermoduls mit dem LED-Lichtmodul aus Figur 1 in einer perspektivischen Ansicht von hinten und unten;

Figur 3

einen Ausschnitt des erfindungsgemäßen LED-Scheinwerfermoduls mit dem LED-Lichtmodul aus Figur 1 in einer perspektivischen Ansicht von vorne und unten;

Figur 4

einen Adapter des LED-Lichtmoduls aus Figur 1 in einer perspektivischen Ansicht;

Figur 5

Anschlagelemente des LED-Lichtmoduls aus Figur 1 in einer perspektivischen Ansicht;

Figur 6

eine Platine mit LED-Lichtquelle des LED-Lichtmoduls aus Figur 1 in einer perspektivischen Ansicht;

Figur 7

das vormontierte LED-Lichtmodul aus Figur 1 in einer perspektivischen Ansicht;

Figuren 8-11

verschiedene Phasen eines Montagevorgangs des LED-Lichtmoduls aus Figur 1 auf einer Optikeinheit eines erfindungsgemäßen LED-Scheinwerfermoduls;

Figuren 12-15

verschiedene Phasen eines Demontagevorgangs des LED-Lichtmoduls aus Figur 1 von einer Optikeinheit eines erfindungsgemäßen LED-Scheinwerfermoduls;

Figur 16

einen Ausschnitt des erfindungsgemäßen LED-Scheinwerfermoduls mit montiertem LED-Lichtmodul aus Figur 1 in einer perspektivischen Ansicht von vorne und unten;

Figur 17

einen Ausschnitt des erfindungsgemäßes LED-Scheinwerfermoduls mit montiertem LED-Lichtmodul aus Figur 1 in einer perspektivischen Ansicht von hinten und unten;

Figur 18

ein nicht unter den Schutzumfang von Anspruch 1 fallendes LED-Lichtmodul gemäß einer zweiten bevorzugten Ausführungsform in einer perspektivischen Ansicht von vorne und unten;

Figuren 19-22

verschiedene Phasen eines Montagevorgangs des LED-Lichtmoduls aus Figur 18 auf einer Optikeinheit eines erfindungsgemäßen LED-Scheinwerfermoduls; und

Figur 23

einen Kraftfahrzeugscheinwerfer mit einem erfindungsgemäßen LED-Scheinwerfermodul gemäß einer bevorzugten Ausführungsform in einer perspektivischen Ansicht.

Show it:

figure 1

an inventive LED light module according to a first preferred embodiment in a perspective view from the front and below;

figure 2

a section of an LED headlight module according to the invention with the LED light module figure 1 in a perspective view from behind and below;

figure 3

a section of the LED headlight module according to the invention with the LED light module figure 1 in a perspective view from the front and below;

figure 4

an adapter of the LED light module figure 1 in a perspective view;

figure 5

stop elements of the LED light module figure 1 in a perspective view;

figure 6

a circuit board with LED light source of the LED light module figure 1 in a perspective view;

figure 7

the pre-assembled LED light module figure 1 in a perspective view;

Figures 8-11

different phases of an assembly process of the LED light module figure 1 on an optical unit of an LED headlight module according to the invention;

Figures 12-15

different phases of a dismantling process of the LED light module figure 1 of an optical unit of an LED headlight module according to the invention;

figure 16

shows a section of the LED headlight module according to the invention with the LED light module installed figure 1 in a perspective view from the front and below;

figure 17

shows a section of the LED headlight module according to the invention with the LED light module installed figure 1 in a perspective view from behind and below;

figure 18

an LED light module not covered by the scope of claim 1 according to a second preferred embodiment in a perspective view from the front and below;

Figures 19-22

different phases of an assembly process of the LED light module figure 18 on an optical unit of an LED headlight module according to the invention; and

figure 23

a motor vehicle headlight with an LED headlight module according to the invention according to a preferred embodiment in a perspective view.

In figure 23 a motor vehicle headlight is denoted by the reference numeral 2 in its entirety. The headlight 2 is designed for installation in a corresponding installation opening on the front of a motor vehicle. The headlight 2 includes a housing 4, which is preferably made of plastic. The housing 4 has a light exit opening 8 in a light exit direction 6 which is closed by a transparent cover plate 10 . This is preferably made of plastic or glass. It can be designed with or without optically effective elements (eg prisms or cylindrical lenses) for scattering the light passing through. An LED headlight module 12 according to the invention is arranged inside the housing 4 figure 23 is shown only schematically.

The LED headlight module 12 is used to generate any headlight function (so-called main light function) or a part thereof. The headlight function can be, for example, a low beam, a high beam, a fog light, or be any adaptive light distribution (e.g. in the form of a bad weather light, a city light, a country road or interurban light, a motorway light, a so-called permanent high beam (also referred to as glare-free high beam or partial high beam) or in the form of a so-called marking light).

In addition to the LED headlight module 12 shown, at least one other light module can also be arranged inside the housing 4 of the headlight 2, which either alone produces another headlight function or together with the LED headlight module 12 produces the headlight function. The other light modules can also be in the form of LED modules, or they can also have other types of light sources, for example an incandescent lamp, gas discharge lamp, laser light source, etc. Of course, the at least one further light module can also be designed as an LED light module according to the invention. The at least one further light module can be designed as a so-called reflection module or as a projection module.

In the case of a reflection module, the light emitted by the light source is bundled by means of primary optics, for example in the form of a reflector, and deflected in the light exit direction 6 . The light distribution of the resulting headlight function, including any light-dark boundary that may be present, is essentially determined by the shape of a reflection surface of the reflector. This usually has a paraboloidal basic shape. Scattering, in particular in the horizontal direction, of the light passing through can be effected by optically effective elements on the cover pane 10 and/or the reflection surface.

In a projection module, the light emitted by the light source is bundled by primary optics, for example in the form of a reflector or a lens element, and deflected into the light exit direction 6 . If a reflector is used, it usually has an ellipsoidal basic shape. In the beam path of the light bundled by the primary optics, a secondary optics is arranged, for example. In the form of a projection lens or a projection reflector, which one of the Primary optics in a focal plane of the secondary optics generated intermediate light distribution maps as the resulting light distribution of the headlight function on the road in front of the motor vehicle. In the beam path of the light bundled by the primary optics, preferably in the focal plane of the secondary optics, which often coincides with the focal plane of the primary optics, a diaphragm arrangement can be arranged with an edge that shades or deflects part of the bundled light and whose edge is perceived by the secondary optics as a Light-dark boundary of a dimmed light distribution is projected onto the road.

The LED headlight module 12 according to the invention can also be designed as a reflection module or as a projection module. However, secondary optics, for example in the form of a projection lens, are not shown in the figures.

LED headlight modules 12 use semiconductor light sources, in particular in the form of one or more light-emitting diodes (LEDs) 22, which are combined to form an LED chip 22a. Under normal operating conditions, semiconductor light sources generally have a significantly longer service life than conventional light sources. In practice, no LED headlight modules 12 are known in which the LED light sources 22 can be replaced easily, quickly and inexpensively. In the event of a defect in one or more LED light sources 22, the entire headlight 2 must currently always be replaced, which is associated with considerable effort and correspondingly high costs for material and working hours. The previously proposed solutions for LED headlight modules with replaceable LED light sources (e.g. from the US 2015/0 308 652 A1 ) primarily have the disadvantage that they cannot provide a standard interface that would allow the light source to be positioned (positioned and aligned) with respect to the optical unit in a highly precise, quickly manufacturable, reproducible manner. This is where the present invention can help.

An LED headlight module 12 is proposed, which has an exchangeable LED light module 20, the structure and its assembly/disassembly below based on the Figures 1 to 22 is explained in more detail. The LED headlight module 12 comprises an LED light module 20 with at least one LED light source 22 for emitting light and an optical unit 24 separate from the LED light module 20 and having at least one optical deflection element 26. The deflection element 26 is designed, for example, as a reflector . Of course, the deflection element 26 can also be designed as a lens or as another suitable optical element. In this case, the lens would then have a receptacle or mount to which the LED light module 20 could be positioned in an exact position and releasably attached.

The LED light module 20 includes a circuit board (printed circuit board, PCB) 28 on which the at least one LED light source 22 is attached and electrically contacted. In the examples shown, a total of three LED light sources 22 are arranged next to one another in the y-direction on an LED chip 22a. The contacting of the LED light sources 22 leads via conductor tracks of the circuit board 28 to an electrical plug connector 28a. The electrical plug connector 28a is preferably arranged on the side of the circuit board 28 on which the LED light sources 22 are located. A control device for controlling and/or supplying energy to the LED light sources 22 is connected to the LED light module 20 via this by means of a corresponding plug connector (not shown). Furthermore, the LED light module 20 includes a heat sink 30 made of a material with good thermal conductivity. The heat sink 30 is made in particular from a metal with a thermal conductivity of more than 70 W/(mK), preferably more than 100 W/(mK), very particularly preferably at least 235 W/(mK). Aluminum in particular is proposed as the material for the heat sink 30 . The heat sink 30 is preferably designed as a one-piece bent sheet metal part. Finally, the LED light module 20 includes an adapter 32 that is separate from the heat sink 30 and the circuit board 28 for the precise positioning and detachable attachment of the LED light module 20 to the optical unit 24 of the LED headlight module 12.

In the examples shown here, the adapter 32 (cf. figure 4 ) made of a metal sheet, in particular made of a spring steel sheet. However, it would of course also be conceivable to produce the adapter from a plastic, for example using an injection molding process. A development of the adapter 32 can be stamped from the sheet metal and then bent into the desired shape. The adapter 32 is rigidly secured to an underside (the surface facing in the negative z-direction) of the heat sink 30 by means of three fastening screws 34 which pass through corresponding holes 34a in the adapter 32 . It is also conceivable to use a different number of fastening screws 34 or to fasten the adapter 32 to the heat sink 30 in a way other than by means of screws.

When attaching the adapter 32 to the heat sink 30, the circuit board 28 is arranged in between, so that when the adapter 32 is attached, it is clamped between an upper side (the surface directed in the positive z-direction) of the adapter 32 and the underside of the heat sink 30 and thereby indirectly is attached to the adapter 32 and the heat sink 30. Suitable positioning means (pins and corresponding recesses or holes) can be provided on the circuit board 28 and the adapter 32 for positioning the circuit board 28 relative to the adapter 32 . The positioning means of the adapter 32 can be formed in one piece with the rest of the adapter 32 in a simple manner during the manufacture of the adapter 32, for example during stamping or bending. Appropriate positioning means which can engage with the positioning means of the adapter 32 can be formed in a simple manner in the circuit board 28 . However, it would also be conceivable for the circuit board 28 to be attached to the heat sink 30 separately from the adapter 32, for example by means of one or more separate attachment screws. Another way of attaching the circuit board 28 to the heat sink 30 would also be conceivable, e.g. gluing or welding.

During operation of the LED light sources 22, they emit heat, which is conducted indirectly via the circuit board 28 to the heat sink 30, which emits it to the environment. For better heat dissipation, 28 special areas in the circuit board be provided or the entire circuit board 28 be made of a special material or have a special structure, so that a particularly good heat transfer from the light sources 22 or the LED chip 22a to the heat sink 30 is made possible.

In the Figures 1 to 17 a first exemplary embodiment of an LED light module 20 according to the invention is shown. This has at least one stop element 46, 48, which is arranged on the LED light module 20 and is designed to position the LED light module 20 in a precise position relative to the optics unit 24 in at least one plane with a corresponding referencing geometry 40, 42, 44 of the optics unit 24 (cf. Figures 3 and 16 ) to work together. In the example shown, two stop elements 46, 48 are provided. Through the interaction of the stop elements 46, 48 with the referencing geometry 40, 42, 44, the relative position between the optics unit 24 and the LED light module 20 to be detachably fastened thereto can be precisely specified, particularly in an xy plane. In this example, the referencing geometry comprises a first stop surface 40 which acts in the x-direction and extends in the y-direction. Furthermore, the referencing geometry comprises two further stop surfaces 42, 44 which are in a V-shape relative to one another and which act in the x and y directions and each extend obliquely to the x and y directions. The two abutment surfaces 42, 44 which are in a V-shape relative to one another are offset in the y-direction relative to the first abutment surface 40 on the optical element 24.

In the example shown, the optics unit 24 has a base plate 24a on which the deflection element 26 designed as a reflector is arranged. The base plate 24a and the deflection element 26 are formed as a single piece. The first stop surface 40 and the other stop surfaces 42, 44 which are inclined relative to one another are preferably formed on a front edge section 24d of the base plate 24a which is directed in the direction of travel or in the x-direction.

In the example of Figures 18 to 22 the stop elements are designed as referencing pins 46, 48 which are attached to the circuit board 28. In particular, the Referencing pins 46, 48 are used in relation to the LEDs 22 with high precision drilled holes in the circuit board 28 and fixed therein. Pins 46, 48 can be fixed to circuit board 28, for example, by means of a press fit, adhesive, paint, or in some other way. When the LED light module 20 is mounted on the optics unit 24, the referencing pin 48 comes into an operative connection with the mutually inclined stop surfaces 42, 44 of the optics unit 24 and ensures that the LED light module 20 moves in the x-direction and in the y-direction is positioned relative to the optics unit 24 . The referencing pin 46 comes into an operative connection with the stop surface 40 and ensures that the LED light module 20 can no longer be rotated about a vertical axis of rotation, which is defined by a longitudinal axis of the referencing pin 48 (parallel to the z-axis). is.

In the example of Figures 1 to 17 the stop elements 46, 48 are not formed on the circuit board 28, but in the form of referencing surfaces of a referencing part 60 made of plastic (cf. figure 5 ). The referencing part 60 is fastened to the LED light module 20 or in relation to the circuit board 28, the heat sink 30 and the adapter 32, for example by means of one of the screws 34 which is guided through an opening 62 in the referencing part 60. Other types of attachment are also conceivable. The referencing surfaces 46, 48 are designed in particular as distal end surfaces of conically shaped or tapering projections 64, which are directed in the negative x-direction. The referencing part 60 can be produced by means of an injection molding process. If the adapter 32 is made of plastic, the referencing part 60 could be designed as an integral part of the adapter 32 in one piece with it and be manufactured together with it.

In the example of Figures 1 to 17 the adapter 32 has two spring elements 50 which, when the LED light module 20 is installed, the stop elements 46, 48 of the LED light module 20 for the precise positioning of the LED light module 20 relative to the optics unit 24 against the referencing geometry 40, 42, 44 of the Press optics unit 24. Of course, only one spring element or more than the two spring elements shown can also be provided. The spring elements 50 are each in one piece with the adapter, for example as a leaf spring or spring clip 32 and are supported on the optics unit 24 . They are preferably supported on a rear edge section 24c (directed in the negative x-direction) of the base plate 24a of the optics unit 24 . The base plate 24a is then to a certain extent clamped between the stop elements 46, 48 and the spring elements 50. Due to the interaction of the spring elements 50 on the one hand and the stop elements 46, 48 and the referencing geometry 40, 42, 44 on the other hand, the LED light module 20 is positioned precisely in the xy plane relative to the optical unit 24.

The adapter 32 also has a fastening arrangement for the detachable fastening of the LED light module 20 , which is positioned precisely, on the optics unit 24 . The fastening arrangement is designed in particular to hold the LED light module 20 on the optics unit 24 in the z-direction. The fastening arrangement has a first holding element 56 which is articulated on the adapter 32 in an articulation area 78 and has a holding arm 56a which is resilient in a z-direction and an active surface 56b formed thereon which extends essentially in a plane parallel to the xy plane and which holds the precisely positioned LED light module 20 on the optics unit 24 in the z-direction, with the effective surface 56b acting on a portion of the optics unit 24 which, when the LED light module 20 is positioned precisely, is opposite the portion of the optics unit 24 on which the at least one Stop element 46, 48 acts. Of course, more than one holding element 56 or holding arm 56a can also be provided. The articulation area 78 of the holding arm 56a is at a distance from the stop elements 46, 48 or from the front edge area 24d of the base plate 24a. On the rear side of the optics unit 24, in particular the deflection element 26, there is a projection 24b, which is directed counter to the light exit direction 6 and extends essentially in a plane parallel to the xy plane -Light module 20 supports in the z-direction. Alternatively, the effective surface 56b of the holding arm 56a can also act on a partial area of the optics unit 24 which is located in a rear edge area 24c of the base plate 24a. The holding arm 56a is designed to be resilient in the z-direction, so that when the LED light module 20 is mounted on the Optical unit 24, the base plate 24a of the optical unit 24 can be pushed under the holding arm 56a without any problems and the light module 20 is nevertheless held securely in the z-direction relative to the base plate 24a in the assembled state.

The fastening arrangement has two second holding elements 52, 54 articulated on the adapter 32 in an articulation area 78, each with a holding arm 52a, 54a which is resilient in the z-direction and an active surface 52b, 54b formed thereon. Of course, only a second holding element or more than the two holding elements 52, 54 or two holding arms 52a, 54a can be provided. The articulation area 78 of the holding arms 52a, 54a is at a distance from the stop elements 46, 48 or from the front edge area 24d of the base plate 24a. The articulation area 78 of the holding elements 52, 54, 56 is preferably arranged on a rear area of the adapter 32 pointing counter to the light exit direction 6, so that when the LED light module 20 is positioned precisely on the optics unit 24, the articulation area 78 is behind the rear edge area 24c of the base plate 24a is arranged. This has, for example, compared to the DE 10 2017 122 560 the advantage that there are no holding elements 52, 54 on the front edge region 24d of the base plate 24a in the light emission region of the light reflected by the deflection element 26, which could disturb the light distribution. The active surfaces 52b, 54b extend essentially in a plane parallel to the xy plane and hold the precisely positioned LED light module 20 in the z-direction on the optics unit 24. The active surfaces 52b, 54b of the holding arms 52a, 52b act on a partial area of the optical unit 24, which in this example is between the articulation area 78 of the holding elements 52, 54 on the adapter 32 and the stop elements 46, 48 of the LED light module 20. More precisely, the effective surfaces 52b, 54b of the holding arms 52a, 52b act on a partial area of the base plate 24a, which lies between the front edge area and the rear edge area of the base plate 24a.

Very particularly preferably, two passage openings 80 are formed in the deflection element 26 adjacent to the base plate 24a, through which, when the LED light module 20 is held on the optics unit 24, the resilient holding arms 52a, 54a reach through, so that the partial area of the base plate 24a on which the active surfaces 52b, 54b of the resilient retaining arms 52a, 54a of the second retaining elements 52, 54 act is arranged on a side of the deflection element 26 opposite the articulation area 78 of the resilient retaining arms 52a, 54a. This allows the LED light module 20 to be held particularly securely on the optics unit 24 .

The fastening arrangement or the holding arms 52, 54, 56 and the spring elements 50 are formed in one piece with the adapter 32. The articulation area 78 of the holding arms 52, 54, 56 and the spring elements 50 are preferably arranged next to one another on the same side of the adapter 32. When the LED light module 20 is mounted, this side is located on the rear edge area of the base plate 24a of the optics unit 24. The interaction of the holding arms 52, 54, 56 means that the adapter 32 and with it the entire LED light module 20 are particularly safe and reliable, e.g - Direction held on the base plate 24a of the optical unit 24.

The LED light module 20 according to the invention is preassembled by the adapter 32 and the circuit board 28 being attached to the heat sink 30 . The referencing part 60 with the referencing surfaces 46, 48 can be attached to the circuit board 28 beforehand. Alternatively, the referencing part 60 can also be attached to the heat sink 30 separately or together with the adapter 32 and the circuit board 28 . The preassembled LED light module 20 is then placed manually on the optics unit 24, in particular on a rear edge section 24c of the base plate 24a (cf. figures 8 and 19 ) and releasably attached to it by a combined translational/pivoting movement (cf. Figures 9 to 11 or 20 to 22).

In contrast to the LED light module 20 according to the first embodiment, the light module 20 according to FIG Figures 18 to 22 only a first central holding element 56 with a holding arm 56a, which is arranged between the two spring elements 50. The LED light module 20 is held on the optics unit 24 solely by the holding arm 56a. The holding arm 56a also has no effect a partial area of the base plate 24a of the optics unit 24, but on a projection 24b attached to the deflection element 26 and protruding backwards in the negative x-direction.

In order to detachably attach the LED light module 20 to the optics unit 24, the preassembled LED light module 20 is first placed on the optics unit 24 from behind in a slightly inclined position with the front section of the light module 20 tilted slightly upwards (cf. figures 8 and 19 ). A translational movement of the light module 20 placed at an angle is then carried out in the positive x-direction (cf. figures 9 or 20). The translational movement is identified by an arrow 66 . The active surfaces 56b; 52b, 54b of the holding arms 56a; 52a, 54a can be arranged on the underside of the partial area of the optics unit 24 on which they act in the mounted position. In the first exemplary embodiment, this is the underside of the base plate 24a of the optics unit 24 (cf. figure 10 ) for the active surfaces 52b, 54b of the holding arms 52a, 54a and the underside of the projection 24b formed on the back of the deflection element 26 of the optics unit 24 for the active surface 56b of the holding arm 56a. In the second embodiment, this is the underside of the projection 24b (cf. Figures 20 and 21 ) for the active surface 56b of the holding arm 56a. Towards the end of the translational movement 66, the holding element 56 encompasses the rear edge region of the projection 24b, ie the effective surface 56b of the holding arm 56a rests on the underside of the projection 24b (cf. figure 10 ). Furthermore, towards the end of the translational movement 66, the spring elements 50 (in the first exemplary embodiment) or one spring element 50 (in the second exemplary embodiment) are elastically deformed against their spring force.

The translatory movement 66 is continued until the stop elements 46 , 48 are arranged beyond (or in front of, in the positive x-direction) the referencing geometry 40 , 42 , 44 of the optics unit 24 . The LED light module 20 is now pivoted in a pivoting movement about an axis of rotation which is formed approximately by the rear edge region of the base plate 24a (cf. figures 10 and 21 ). Due to the resilient configuration of the holding elements 52, 54, 56 in the z-direction the axis of rotation is not precisely defined. The pivoting movement is identified in the figures by an arrow 68 and takes place counterclockwise, ie the front section of the LED light module 20 is moved in the negative z-direction. The axis of rotation preferably runs parallel to the y-axis. The pivoting movement is complete when the bottom of the LED light module 20 comes to rest on the top of the base plate 24a of the optics unit 24 . Then the LED light module 20 is released. The spring force of the prestressed spring elements 50 moves the light module 20 relative to the optics unit 24 in the negative x-direction until the stop elements 46, 48 come into active engagement with the referencing geometry 40, 42, 44 of the optics unit 24 (cf. figures 11 and 22 ). The corresponding translational movement is denoted by reference number 70 . The LED light module 20 is thus positioned and held in the xy plane in a precise position relative to the optics unit 24 . The detachable attachment of the light module 20 in the z-direction to the optics unit 24 is effected by the retaining elements 56; 52, 54

The installation of the LED headlight module 12 by placing and pivoting the LED light module 20 on the optics unit 24 can therefore be carried out quickly and easily, with one hand and without visual contact (ie blind) even in very tight spaces. Through the action of the holding arms 52a, 54a, 56a, the LED light module 20 is held securely and reliably in the z-direction on the optics unit 24, even under mechanical stress (e.g. vibrations and impacts), as occurs during operation of the motor vehicle on which the Headlight 2 is mounted with the LED headlight module 12 can occur.

The dismantling of the LED light module 20 from the optics unit 24 is subsequently based on the Figures 12 to 15 explained in more detail. It is always carried out in the reverse order to the assembly. During disassembly, the LED light module 20 is initially moved forward in the positive x-direction against the spring force of the at least one spring element 50 relative to the optical unit 24 (cf. figure 12 ; arrow 72). This releases the active engagement between the stop elements 46, 48 of the light module 20 and the corresponding referencing geometry 40, 42, 44 of the optics unit 24. Then the LED light module 20 in Pivoted clockwise around the axis of rotation, with the front section of the light module 20 moving in the positive z-direction (cf. figure 12 ; arrow 74). The pivoting movement is only a few angular degrees, in any case significantly less than in previously known solutions where the pivoting movement is at least 15°. As soon as the stop elements 46, 48 are arranged above the referencing geometry 40, 42, 44 (cf. figure 13 ), the inclined LED light module 20 is moved translationally in the negative x-direction (arrow 76). The rear edge section 24c of the base plate 24a of the optics unit 24 emerges from under the holding arm 56a of the first holding element 56 or under the holding arms 52a, 54a of the second holding elements 52, 54 and the effective surface 56b of the holding arm 56a slides along the underside of the projection 24b in In the direction of the rear edge section and the effective surfaces 52b, 54b of the holding arms 52a, 54a slide along the underside of the base plate 24a in the direction of the rear edge section 24c (cf. figure 14 ). Towards the end of the translational movement, the LED light module 20 can then be lifted off the optics unit 24 (cf. figure 15 ); dismantling is now complete.

The advantage of dismantling is that no tools, e.g. for unlocking locking hooks or similar, are required. The space required for dismantling is minimal due to the small pivoting angle of the pivoting movement 74 .

Claims (17)

1. LED headlight module (12) comprising

   an LED light module (20) with at least one LED light source (22) for emitting light and

   an optical unit (24) separate from the LED light module (20) and having at least one optical deflection element (26) for focusing and deflecting at least part of the emitted light in a light exit direction (6) of the LED headlight module (12),

   wherein the LED light module (20) comprises a circuit board (28) on which the at least one LED light source (22) is mounted and electrically contacted, and an adapter (32) separate from the circuit board (28) for detachably mounting the LED light module (20) on the optical unit (24) of the LED headlight module (12),

   wherein the circuit board (28) and the adapter (32) are at least indirectly rigidly fastened to each other,

   the LED light module (20) has at least one stop element (46, 48) which, for the positionally accurate positioning of the LED light module (20) in respect to the optical unit (24) in an xy plane, is arranged on the LED light module (20) and designed in such a manner that it interacts with a corresponding referencing geometry (40, 42, 44) of the optical unit (24),

   the adapter (32) comprises at least one spring member (50) which presses the at least one stop element (46, 48) of the LED light module (20) against the referencing geometry (40, 42, 44) of the optical unit (24) when the LED light module (20) is mounted in order to position the LED light module (20) accurately in the xy plane, and

   the adapter (32) comprises a fastening arrangement (52, 54, 56) for releasably fastening the positionally accurately positioned LED light module (20) to the optical unit (24) in a z-direction,

   wherein the fastening arrangement (52, 54, 56) has at least one first retaining element (56) which is articulated to the adapter (32) in an articulation region (78) and has a retaining arm (56a) resilient in a z-direction and an effective surface (56b) formed thereon which extends substantially in a plane parallel to the xy-plane and which holds the positionally accurately positioned LED light module (20) in the z-direction on the optical unit (24), wherein the effective surface (56b) acts on a partial region of the optical unit (24) which, when the LED light module (20) is positionally accurately positioned, is located opposite the partial region of the optical unit (24) on which the at least one stop element (46, 48) acts,

   characterized in that

   the fastening arrangement (52, 54, 56) has at least one second retaining element (52, 54) which is articulated to the adapter (32) in an articulation region (78) and has a retaining arm (52a, 54a) resilient in a z-direction and an effective surface (52b, 54b) formed on the retaining arm (52a, 54a), which extends substantially in the plane parallel to the xy-plane and which holds the positionally accurately positioned LED light module (20) in the z-direction on the optical unit (24), wherein the effective surface (52b, 54b) acts on a partial region of the optical unit (24) which, when the LED light module (20) is positionally accurately positioned, is located between the partial region of the optical unit (24) on which the first retaining element (56) acts and the partial region of the optical unit (24) on which the at least one stop element (46, 48) acts.
2. LED headlight module (12) according to claim 1,
   characterized in that
   all retaining elements (52, 54, 56), which detachably fasten the positionally accurately positioned LED light module (20) in the z-direction to the optical unit (24), are articulated to the adapter (32) on the same side of the adapter (32) in the articulation region (78).
3. LED headlight module (12) according to claim 1 or 2,
   characterized in that
   the articulation region (78) of the first and/or second retaining elements (56; 52, 54) is formed on a rear side of the adapter (32) directed opposite to the light exit direction (6) when the LED light module (20) is positionally accurately positioned.
4. LED headlight module (12) according to one of the preceding claims,
   characterized in that
   the at least one spring member (50) is articulated to the adapter (32) on the side of the articulation region (78) of the retaining elements (56; 52, 54).
5. LED headlight module (12) according to one of the preceding claims,
   characterized in that
   the adapter (32) is made of metal, in particular of a spring steel.
6. LED headlight module (12) according to one of the preceding claims,
   characterized in that
   the at least one first retaining element (56), the at least one spring member (50) and the at least one second retaining element (52, 54) are formed as a single part with the adapter (32).
7. LED headlight module (12) according to one of the preceding claims,
   characterized in that
   the LED light module (20) comprises a heat sink (30) made of a material with good thermal conductivity, in particular made of metal, most particularly of aluminum, to which the circuit board (28) and the adapter (32) are attached.
8. LED headlight module (12) according to one of the preceding claims,
   characterized in that

   the optical unit (24) comprises a base plate (24a) on which the deflection element (26) is arranged,

   wherein the LED light module (20) is positioned accurately with respect to the base plate (24a) and the partial regions of the optical unit (24), on which the at least one stop element (46, 48), the at least one spring member (50) and the at least one second retaining element (52, 54) act, lie at and/or on the base plate (24a).
9. LED headlight module (12) according to one of the preceding claims,
   characterized in that

   the optical unit (24), in particular the deflection element (26), has a projection (24b) directed rearwardly opposite to the light exit direction (6),

   wherein the partial region of the optical unit (24), on which the effective surface (56b) of the at least one first retaining element (56) acts, lies at and/or on the projection (24b).
10. LED headlight module (12) according to one of the preceding claims,
    characterized in that
    the at least one stop element (46, 48) of the LED light module (20) is formed on the circuit board (28) or on the adapter (32).
11. LED headlight module (12) according to claim 10,
    characterized in that
    the at least one stop element (46, 48) is formed as a single part with the adapter (32).
12. LED headlight module (12) according to claim 10,
    characterized in that
    the at least one stop element (46, 48) comprises at least one referencing pin that passes through a hole in the circuit board (28) and is fastened to the circuit board (28).
13. LED headlight module (12) according to claim 10,
    characterized in that
    the at least one stop element (46, 48) is formed as a plastic referencing part with at least one referencing surface, which is fastened to the circuit board (28).
14. LED headlight module (12) according to one of the preceding claims,
    characterized in that
    the referencing geometry (40, 42, 44) of the optical unit (24) comprises a first stop surface (40) extending in the y-direction and acting in the x-direction, as well as two further stop surfaces (42, 44) which are V-shaped in respect to one another, act in the x-direction and in the y-direction, respectively, and extend obliquely to the x-direction and to the y-direction, respectively.
15. LED headlight module (12) according to one of the preceding claims,
    characterized in that

    the optical unit (24) has a base plate (24a) on which the deflection element (26) is formed,

    wherein the deflecting element (26) has, adjacent to the base plate (24a), at least one reach-through opening (80) through which the at least one second retaining element (52, 54) reaches when the LED light module (20) is held on the optical unit (24), so that the partial region of the optical unit (24), on which the effective surface (52b, 54b) of the at least one second retaining element (52, 54) acts, is located on a side of the deflection element (26) opposite the articulation region (78) of the at least one second retaining element (52, 54).
16. LED light module (20) provided for use in an LED headlight module (12), the light module (20) comprising a circuit board (28) on which at least one LED light source (22) is mounted and electrically contacted, and an adapter (32) separate from the circuit board (28) for detachably mounting the LED light module (20) on an optical unit (24) of the LED headlight module (12),
    characterized in that
    the LED light module (20) is designed for use in an LED headlight module (12) according to one of the preceding claims.
17. Method for mounting an LED light module (20) of an LED headlight module (12) on an optical unit (24), which is separate from the LED light module (20), of the LED headlight module (12), the LED light module (20) comprising a circuit board (28) with at least one LED light source (22) for emitting light and an adapter (32), which is separate from the circuit board (28), for detachably fastening the LED light module (20) to the optical unit (24), and wherein the optical unit (24) comprises at least one optical deflection element (26) for focusing and deflecting at least part of the emitted light in a light exit direction (6) of the LED headlight module (12) and a base plate (24a) on which the deflection element (26) is formed,
    characterized by the steps of, with the optical element (24) stationary:

    obliquely placing the LED light module (20) on a rear edge portion (24c) of the base plate (24a) of the optical unit (24), said rear edge portion (24c) being directed opposite to the light exit direction (6),

    translatory movement (66) of the obliquely positioned LED light module (20) forward in the light exit direction (6) against a spring force of at least one spring member (50) of the adapter (32) until at least one stop element (46, 48) of the LED light module (20) is arranged beyond a front edge portion (24d) of the base plate (24a), wherein, at the end of the translatory movement, at least a first retaining element (56) of the adapter (32) rests with an effective surface (56b) of a retaining arm (56a), which is resilient in the z-direction, under spring load on a partial region of the optical unit (24), which partial region is arranged on a side of the optical unit (24) opposite the LED light module (20), in particular on the base plate (24a),

    pivoting (68) the LED light module (20) about an axis of rotation defined by the rear edge portion (24c) of the base plate (24a), wherein a front portion of the LED light module (20) is moved toward the base plate (24a) of the optical unit (24) until a lower side of the LED light module (20) comes to rest on an upper side of the optical unit (24), in particular on the base plate (24a),

    translatory movement (70) of the LED light module (20) opposite to the light emission direction (6) supported by the spring force of the at least one spring member (50) until the at least one stop element (46, 48) comes into operative engagement with a referencing geometry (40, 42, 44) formed on the front edge portion (24d) of the base plate (24a) of the optical unit (24),

    pressing the at least one stop element (46, 48) of the LED light module (20) against the referencing geometry (40, 42, 44) formed on the front edge portion (24d) of the base plate (24a) of the optical unit (24) by means of the spring force of the at least one spring member (50), and

    holding the LED light module (20) on the optical unit (24) in a direction perpendicular to a surface extension of the base plate (24a) by means of the at least one first resilient retaining element (56).

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