EP3757449A1 - Illumination device of a motor vehicle headlight - Google Patents

Abstract

Lighting device of a motor vehicle headlight comprising an objective (1, 10) and at least one light source (2), wherein a light image (LI) can be generated by the at least one light source (2), the light image (LI) generated by the light source (2) by means of of the objective (1, 10) can be projected in front of the lighting device in the form of a light distribution, the objective (1, 10) having at least one projection optics (3, 30, 31) and one projection optics holder (4, 40), wherein the projection optics holder ( 4, 40) at least one receptacle (5, 50, 51) is formed, the at least one receptacle (5, 50, 51) corresponding to the at least one projection optics (3, 30, 31), the at least one projection optics (3, 30 , 31) is received in the at least one receptacle (5, 50, 51), a reference point system (6, 60, 61) being defined in the at least one receptacle (5, 50, 51) in order to establish a position in this receptacle (5, 50, 51) recorded projection optics (3, 30, 31) in such a way that the light image (LI) lies essentially in a focal plane of the lens (1, 10), with reference points (6-1 to 6-6, 60-1 to 60-16, 61-1 to 61-10) of the reference point system (6, 60, 61) are arranged according to the 3-2-1 rule, the at least one receptacle (5, 50, 51) being closed in this way by means of a closing element (7, 70) is that the at least one projection optics (3, 30, 31) is fixed and held in the position determined by the reference point system (6, 60, 61) in the at least one receptacle (5, 50, 51).

Description

The invention relates to a lighting device for a motor vehicle headlight, in particular a lighting device that functions according to a projection principle. The lighting device comprises at least one light source and an objective for projecting a light image that can be generated by means of this at least one light source in the form of a light distribution in front of the lighting device. If the lighting device is installed in a motor vehicle headlight, the switched-on lighting device forms the light distribution in front of the motor vehicle headlight or in front of a motor vehicle if the motor vehicle headlight is already installed in the motor vehicle. The at least one light source preferably comprises a surface on which it can generate the light image and, when it is switched on, generates this light image on the surface. In particular, the at least one light source can generate the light image on a side of the surface facing the objective. The objective comprises at least one projection optics and one projection optics holder, at least one receptacle being formed in the projection optics holder, the at least one receptacle corresponding to the at least one projection optics and the at least one projection optics being received in the at least one receptacle.

The invention also relates to a motor vehicle headlight with at least one such lighting device.

The at least one projection optics can be a lens, for example a biconcave, biconvex, plano-concave, plano-convex lens, or a lens system made up of such lenses. In connection with the present invention, the term “objective” is understood to mean a scattering optical system which generates a real optical image (light distribution in front of the lighting device) of an object (light image). The simplest lens can comprise a single lens. It goes without saying that when the light source is not switched on, the objective produces an image of a switched off light source, preferably the surface on which the light source can produce the aforementioned light image.

Lighting devices of the type mentioned above are known from the prior art, see e.g. AT 517126 B1 , DE 102012213842 A1 .

In the case of the lighting devices known from the prior art, complex positioning devices are used to precisely position the objective or the projection optics in the objective. This creates a long chain of tolerances, which leads to high process costs in production. From AT 517126 B1 known positioning device is also designed only for rotationally symmetrical lenses.

It is therefore an object of the present invention to create a lighting device whose adjustment can be carried out without complex positioning devices, with the objective of the lighting device not only being able to use rotationally symmetrical lenses, and in which lighting device the tolerance chain, in particular in the objective, is shortened.

The object is achieved according to the invention in that a reference point system is defined in the at least one recording in order to determine a position of the projection optics recorded in this recording such that the light image lies essentially in a focal plane of the objective, reference points of the reference point system according to 3-2 -1 rule are arranged, wherein the at least one receptacle is closed by means of a closing element such that the at least one projection optics is fixed and held in the position determined by the reference point system in the at least one receptacle.

In connection with the present invention, the term "light image lying essentially in a focal plane of the objective" is understood to mean that light image which lies in a plane which is arranged at least parallel to the focal plane and preferably coincides with the focal plane. Small inaccuracies in the positioning before or after the focal plane, which are permissible in the technical field, are permitted, especially if a certain blurring of light-dark transitions in the light distribution is to be achieved.

In connection with the present invention, the term “3-2-1 rule” is understood to mean a rule known from tolerance management.

The aforementioned closing element can be designed accordingly, for example have a corresponding shape, in order to close the corresponding receptacle. The closing element can be designed, for example, as one of the projection optics that the corresponding recording - with respect to the projection optics holder on the inside - closes. The closing element can, however, also be designed as a fastening clip which surrounds the projection optics holder at an open end, for example, like a frame and closes the corresponding receptacle - on the outside with respect to the projection optics holder (see figures).

The closing element can also prevent the projection optics from falling out of the receptacle. A play of the at least one projection optics fixed and held in the receptacle corresponding to this projection optics is not, however, excluded. This game can, for example, simplify the insertion of the projection optics into the receptacle and facilitate the assembly of the projection optics in the projection optics holder.

In a preferred embodiment, the projection optics holder can be designed in one piece. In a particularly advantageous embodiment it can be provided that the projection optics holder is made from die-cast magnesium. However, it is also conceivable that the projection optics holder is designed as a plastic injection-molded part. In addition, it is conceivable that the projection optics holder is produced by thixomolding or thixomolding. The choice of the manufacturing process for the projection optics holder depends on how high the accuracy requirements are or how low the tolerance fluctuations in manufacturing may be. Plastic injection molding is a very cheap process. Die casting process is more expensive than plastic injection molding, but enables smaller tolerances. Thixomolding is more expensive than die casting, but allows even smaller tolerances than die casting. Overmilling would also be possible as a separate process step. Milling over is, however, very expensive, but allows flexible adaptation of a given nominal dimension.

It can be expedient for the projection optics holder to have a handling area which protrudes from opposite sides of the projection optics holder. The handling area can be provided in order to enable simple, preferably automatic handling or simple gripping of the projection optics holder. For this purpose, the handling area can for example have tabs or tab-shaped elements extending laterally from the projection optics holder. The handling area can e.g. B. by a Industrial robot (automatically) are detected, which enables a precise longitudinal adjustment in the axial direction or in the direction of the optical axis of the lighting device. In the case of a lighting device with an objective designed in this way, the quality of the optical image can be improved particularly easily. In particular, the image sharpness can thereby be set more precisely and the imaging errors can be at least partially compensated, which are caused by lens shape deviations, lens thickness tolerances or the like. caused. This can be particularly advantageous for those lighting devices that are used to generate logo projections and thus require a high degree of image sharpness.

In a particularly preferred embodiment, it can be provided that the objective comprises at least two projection optics and at least two receptacles are formed in the projection optics holder, each receptacle corresponding to one projection optics and different exposures corresponding to different projection optics, each projection optics being recorded in a receptacle corresponding to these projection optics is and different projection optics are included in different recordings. A reference point system is defined in each recording in order to determine the position of the projection optics recorded in this recording. Different reference point systems are preferably defined in different recordings. As already described, the reference points of each reference point system are arranged according to the 3-2-1 rule, the reference points of the different reference point systems being designed in such a way that all defined positions of the projection optics are coordinated with one another in such a way that the optical axes of the different projection optics coincide and that the light image lies in the focal plane of the lens.

It can be an advantage if the images are of different sizes. It can be provided that each receptacle itself has a constant size (neither tapers nor enlarges).

In addition, it can be advantageous if the size of the recordings decreases, for example in a step-like manner, towards the at least one light source. For example, a recording that is closest to the at least one light source can be the smallest.

Furthermore, it can advantageously be provided that each receptacle is closed by means of a respective closing element, at least one of the closing elements being designed as one of the at least two projection optics. The different projection optics and consequently the different recordings can be of different sizes. For example, one of the projection optics can consist of two or more partial lenses, for example of different sizes, so that the corresponding recordings consist of two or more partial recordings, each of the partial recordings being designed to accommodate a corresponding partial lens. In addition, further reference points can be provided between the partial lenses, which reference the partial lenses to one another, for example in the direction of the optical axis.

Further technical lighting advantages result if the at least two projection optics are designed in such a way that the objective has an apochromatic effect. In this way, for example, a color fringing around a light-dark boundary in the case of a low-beam light distribution or also lateral color errors can be reduced.

Further advantages result if the reference points of the reference point system are arranged according to the surface or translation-rotation-stop principle of the 3-2-1 rule.

It can furthermore advantageously be provided that the at least one receptacle has a receptacle base, at least three of the reference points are designed as referencing elements, the at least three referencing elements being arranged between the receptacle base and the at least one projection optics accommodated in the at least one receptacle, both touch the receiving base and the projection optics and define a primary plane of the reference point system, which is preferably arranged essentially parallel to the receiving base. If there are several recordings, this preferably applies to each recording. The receiving base can be formed (at least partially) by projection optics or a base of the projection optics holder. For example, the at least one projection optics can rest on the referencing elements. Furthermore, the referencing elements can be formed on the at least one projection optics, on one of the partial lenses or on the projection optics holder. In the case of several projection optics, the corresponding primary planes are preferably parallel to one another.

In connection with the present invention, the term “bottom of the projection optics holder” is understood to mean a surface which is situated opposite an opening in the projection optics holder and is perpendicular to the optical axis. This is understood to mean that opening of the projection optics holder through which the projection optics (s) is (are) inserted into the projection optics holder. The term “receiving base” is thus understood to mean a surface which is arranged perpendicular to the optical axis.

In addition, it can advantageously be provided that four referencing elements are provided in the at least one receptacle (and all four define the same primary plane). The fourth referencing element helps e.g. against tilting the projection optics in the recording. If there are several recordings, it can be useful that four referencing elements are arranged in each recording.

In a particularly advantageous embodiment it can be provided that the referencing elements are designed as projections, preferably elevations, in particular convex elevations, extending in the direction of the optical axis. For example, the referencing elements can be designed as hemispheres flattened on their upper side. The aforementioned reference or primary plane can be defined by the ends of the referencing elements.

Particular advantages can arise if the referencing elements are formed on the projection optics holder and / or on the at least one projection optics, preferably form a monolithic structure with the projection optics holder and / or with the at least one projection optics. It can definitely be advantageous if one or more projection optics (or partial lenses) have six, eight or more referencing elements. It is particularly advantageous if the referencing elements are formed on the projection optics, specifically on the optically inactive surfaces of the projection optics.

In addition, it can be advantageous if the referencing elements are designed as spacers.

Further constructional advantages can arise if the projection optics holder and / or the at least one projection optics have counter-elements corresponding to the referencing elements. The counter-elements can be designed, for example, as depressions, recesses, holes (blind or through holes) corresponding to the projections or the spacers, into which the projections or the spacers can at least partially engage.

It can be useful if the at least one receptacle has a side wall adjoining the receptacle base, for example, with at least two more of the reference points - those that are not designed as referencing elements - being designed as centering elements or being defined by centering elements. The side wall does not have to be formed in one piece. For example, the side wall of the receptacle can be formed by a side wall of the projection optics holder or partly by a side wall of the projection optics holder and partly by the closing element.

It can be advantageous if the at least two centering elements are arranged between an inner circumference of the side wall and the at least one projection optics accommodated in the at least one receptacle, touch both the side wall and the projection optics and move the at least one projection optics along the primary plane restrict. It should be noted here that not all projection optics have to touch the corresponding centering elements when the lens is in an assembled state. A certain amount of play is therefore permitted between the projection optics and the centering elements. If necessary, however, this play can be reduced and even completely eliminated, for example by means of spring parts (resilient elements).

It can be useful if the centering elements are formed on the inner circumference of the side wall of the projection optics holder and preferably form a monolithic structure with the projection optics holder.

In a particularly favorable embodiment, the centering elements can be designed as centering elevations extending in the direction of the optical axis, preferably flattened on their upper side. The longitudinal direction of these elevations can coincide with the direction of the optical axis. In addition, the centering elevations protrude from the inside of the projection optics holder towards the center of the objective, preferably perpendicular to the optical axis.

The centering elements can also be designed as centering elevations that are triangular in a section orthogonal to the optical axis, connected by a web and that form a V-shape into which a rotationally symmetrical projection optics can be inserted particularly well. I.e. Such webs can be used to form a V-shaped receptacle (on its lower side) which is particularly well suited for rotationally symmetrical lenses.

In addition, it can be expedient if the at least one projection optics has counter-elements, for example depressions, corresponding to the centering elements.

In addition, it can be provided that the at least one receptacle has a receiving opening, wherein the closing element closing the at least one receptacle is designed and arranged in the receiving opening such that light emerging from the at least one projection optics received in the at least one receptacle through the Closing element can pass. In the case of several receptacles, this preferably applies to each receptacle and each closing element. For this purpose, the closing element can have an opening, for example.

The closing element can be designed as a fastening clip.

It can be useful if the fastening clip is attached to the projection optics holder in such a way that it presses the at least one projection optics accommodated in the projection optics holder at least in a direction opposite to the direction of an optical axis of the objective. The at least one projection optics are thereby preferably fixed in the projection optics holder in such a way that they can no longer move along the optical axis. In the case of several projection optics, all of the projection optics can be fixed in the direction of the optical axis by the fastening clips. I.e. the fastening clip clamps the projection optics in the projection optics holder so that there is no longer any play between the optics in the direction of the optical axis.

In a preferred embodiment, a receiving opening can be formed at that end of the projection optics holder that is from the at least one light source furthest. In this case, the fastening clip can be attached to this end of the projection optics holder. For example, the fastening bracket can have latching openings that match latching lugs formed on this end of the projection optics holder, so that the fastening bracket can latch onto the projection optics holder. The locking lugs can for example be formed on an outer circumference of the end of the projection optics holder. The fastening clip can, for example, enclose the (open) end of the projection optics holder like a frame. In the case of several projection optics, it can be expedient for the fastening clip to press all projection optics towards the light source, ie in the direction of the light source or in the direction opposite to the optical axis. For this purpose, the fastening clip can have two projections, for example.

It can advantageously be provided that the fastening clip has at least two projections in the form of elevations on its side facing the at least one light source, which protrude from the fastening clip as preferably in the direction opposite to the direction of the optical axis. Thus, the accuracy of pressing the projection optics into the projection optics holder is increased. The number of elevations - at least two - has the advantage that the projection optics that are in contact with the elevations are less prone to tilting.

In addition, it can be provided that the at least one light source includes a surface light modulator, in particular a DMD chip, and can generate the light image on the surface light modulator. The mirror array of the surface light modulator can lie in a focal plane of the objective. The surface on which the light image can be formed can thus be designed as a mirror array. The surface can, however, also be designed as a light-emitting surface of one or more LEDs or a light conversion medium plate that can be illuminated with a laser light source.

The at least one light source can comprise semiconductor-based elements, for example laser diodes and / or LEDs.

In a preferred embodiment it can advantageously be provided that the objective furthermore has at least one, preferably flat, in particular planar diaphragm device includes. The diaphragm device can extend perpendicular to the optical axis.

It can be expedient if the at least one diaphragm device has a self-contained diaphragm edge.

It can advantageously be provided that the at least one panel device is designed as a receiving base.

Further advantages can arise if the at least one diaphragm device is designed as a separate plate that is preferably arranged perpendicular to the optical axis of the objective.

The quality of the light distribution can be further improved with the at least one diaphragm device. When multiple aperture devices are provided, they can be used to correct various optical defects.

In one embodiment, it can be expedient if the separate plate has through openings. The through openings can, for example, be designed to match the referencing elements designed as elevations. In the assembled state, the elevations can be received in the through openings. This allows the position of the plate in the objective in relation to projection optics to be determined.

Further advantages can result if the at least one panel device has at least one (preferably two) spring tab (s). As a result, the projection optics can be better clamped in the projection optics holder. Two spring tabs reduce tilting. In general, reducing the tilt reduces decentering errors. Two tabs can be arranged, for example, to the side of the self-contained panel edge.

A particularly advantageous embodiment results when the at least one projection optics consists of two partial lenses and preferably has an achromatic effect. In this way, for example, longitudinal color errors can be reduced. Here you can at least three further referencing elements can be provided between the partial lenses. It can be a so-called achromat (see e.g. DE 10 2010 046 626 84 and in particular paragraphs [0009] to [0013]). One of the two partial lenses can be designed, for example, biconvex or plano-convex, while the other can be designed biconcave or plano-concave.

Furthermore, it can advantageously be provided that the objective comprises resilient elements which are set up to tension the at least one projection optics in the at least one receptacle. The resilient elements can, for example, be arranged in the projection optics holder and, in particular, be designed in one piece with it.

In a preferred embodiment, the lighting device can be designed as a light module. This means that the lighting device in an assembled state forms a structural unit and does not consist of structurally separate elements or sub-units.

In addition, it should be clear that direction-related terms such as “horizontal”, “vertical”, “above”, “below” etc. are to be understood in connection with the present invention in a relative meaning and either refer to the above-mentioned professional Installation position of the subject matter of the invention in a motor vehicle or to a customary alignment of an emitted light distribution in the photograph or in the traffic area.

• Fig. 1a eine Beleuchtungsvorrichtung mit einer Projektionsoptik in perspektivischer Ansicht;
• Fig. 1b eine Beleuchtungsvorrichtung der Fig. 1a in perspektivischer Ansicht ohne Schließelement;
• Fig. 1c eine Beleuchtungsvorrichtung der Fig. 1a in perspektivischer Ansicht ohne Schließelement und ohne Projektionsoptik;
• Fig. 2 eine Beleuchtungsvorrichtung mit drei Linsen in Explosionsdarstellung;
• Fig. 3 ein Projektionsoptikhalter der Beleuchtungsvorrichtung der Fig. 2;
• Fig. 4 der Projektionsoptikhalter der Fig. 3 mit einer ersten Projektionsoptik, und
• Fig. 5 eine Schnittdarstellung des Linsensystems der Beleuchtungsvorrichtung der Fig. 2.

The invention together with further advantages is explained in more detail below using exemplary embodiments that are illustrated in the drawing. In this shows

• Fig. 1a a lighting device with projection optics in a perspective view;
• Figure 1b a lighting device of Fig. 1a in perspective view without closing element;
• Figure 1c a lighting device of Fig. 1a in perspective view without closing element and without projection optics;
• Fig. 2 a three-lens lighting device in an exploded view;
• Fig. 3 a projection optics holder of the lighting device of Fig. 2 ;
• Fig. 4 the projection optics holder of the Fig. 3 with a first projection lens, and
• Fig. 5 a sectional view of the lens system of the lighting device of FIG Fig. 2 .

First will be on Figures 1a to 1c Referenced. These show a lighting device designed as a light module for a motor vehicle headlight with an objective 1 and with a light source 2. The light source 2 can generate a light image LI. Like that Figures 1a to 1c As can be seen, the light source 2 can comprise a surface on which it can generate the light image LI. In particular, the at least one light source can generate the light image LI on a side of the surface facing the objective 1. This surface can, for example, be the surface of a micromirror array of a surface light modulator such as a DMD chip, the surface of a light conversion medium (phosphor) that can convert light from a laser diode source into essentially white light, the light-emitting layer of an LED, or also a light exit surface an additional lens (made of silicone), for example a TIR lens. In the switched-on state of the lighting device, the light source 2 thus generates the light image LI, which is projected by the lens 1 in front of the lighting device in the form of a light distribution. The objective 1 has at least one projection lens 3 and one projection lens holder 4. A receptacle 5 that corresponds to the projection optics 3 is formed in the projection optics holder 4. The projection optics 3 are accommodated in the at least one receptacle 5. The projection optics 3 can, for example, be a lens, for example a rotationally symmetrical lens (see FIG Figures 1a to 1c ) be. A reference point system 6 is defined in the at least one receptacle 5, ie a system of reference points 6-1 to 6-6 which define a position of the projection optics 3 received in the receptacle 5. The position is determined in such a way that the light image lies essentially in a focal plane of the objective 1. The term "essentially in a focal plane ..." is understood to mean that the light image lies in at least one plane which is arranged parallel to the focal plane and preferably coincides with the focal plane, with small, unavoidable inaccuracies in the positioning of the light image that are customary in the art before or after the focal plane are included in this term.

The reference points 6-1 to 6-6 of the reference point system are arranged according to the 3-2-1 rule. This refers to the 3-2-1 rule known from the field of tolerance management, which is also less often referred to as the 3-2-1 principle.

In order to fix and hold the projection optics 3 in the position determined by the reference point system 6 in the receptacle 5, a closing element 7 is provided. The closing element 7 preferably prevents the projection optics 3 from falling out of the receptacle 5. The closing element 7 closes the projection optics 3 in the receptacle 5 in such a way that it is directed onto the projection optics 3 from preferably two directions (in Figure 1b shown with arrows F), into which the projection optics 3 located in the above-mentioned position can "fall" out of the receptacle 5, and thus fixes and holds the projection optics 3 in the position determined by the reference point system 6. Nevertheless, a certain amount of play that is tolerable in the specialist field may be permissible in the YZ plane.

The projection optics holder 4 can be formed in one piece. For example, it can be made from die-cast magnesium. However, a plastic injection-molded part or thixomolding is also conceivable. This is decided depending on the required accuracy requirements (tolerance fluctuations in production) that the optics design requires. If the requirements are very high, post-processing, e.g. Milling over the reference surfaces is conceivable.

Figure 2 shows an exploded view of a lighting device with a light source 2 and with an objective 10, with more than one projection optics being accommodated in the objective 10. Specifically shows Figure 2 an objective 10 with a projection optics holder 40, in which two projection optics 30, 31 are received, one of the projection optics 30, 31 - the projection optics 30 - consisting of two partial lenses 30a and 30b. The projection optics 30, 31 are not rotationally symmetrical. With a projection optics 30 consisting of two sub-lenses 30a and 30b, achromatic errors such as longitudinal color errors can be reduced.

The projection optics holder 40 has a handling area 40a. The handling area 40a is arranged, for example, at that end of the projection optics holder 40 which is closest to the light source 2. The handling area 40a can also be arranged at another point along the longitudinal direction X of the projection optics holder 40. The handling area 40a can, as already described, to facilitate serve an automated gripping of the lens 10 and include laterally protruding tabs with upwardly protruding webs.

To accommodate the projection optics 30, 31, two receptacles 50, 51 are formed in the projection optics holder 40. Each recording 50, 51 corresponds to a projection optics 30, 31 and the different recordings 50, 51 correspond to different projection optics 30, 31. Each projection optics 30, 31 is received in a recording 50, 51 corresponding to these projection optics 30, 31. Different projection optics 30, 31 are recorded in different recordings 50, 51.

A reference point system 60, 61 is defined in each receptacle 50, 51 in order to determine the position of the projection optics 30, 31 received in the respective receptacle 50, 51. As already described above, the reference points 60-1 to 60-16, 61-1 to 61-10 of each reference point system 60, 61 are arranged according to the 3-2-1 rule. The reference points 60-1 to 60-16, 61-1 to 61-10 of the different reference point systems 60, 61 are designed such that all defined positions of the projection optics 30, 31 are coordinated with one another, so that optical axes of the different projection optics 30, 31 coincide and that the light image LI lies essentially in the focal plane of the objective 10. “Lying essentially in the focal plane” means that the light image LI lies at least in a plane which is arranged parallel to the focal plane and preferably coincides with the focal plane. Small inaccuracies in positioning before or after the focal plane are of course allowed.

Each receptacle 50, 51 is closed by means of a respective closing element. It is in Figure 2 (see also Figure 4 ) it can be seen that one of the closing elements, namely that closing element which closes the first projection optics 30 in its receptacle 50, can be designed as the second projection optics 31.

It is also in the Figures 2 to 4 it can be seen that the projection optics 30, 31 and the receptacles 50, 51 are of different sizes. This means, for example, that the receptacle 50 can be smaller than the receptacle 51 ( Figures 2 to 4 ). The size of the receptacles 50, 51 can decrease in the direction of the at least one light source 2. In addition, the Figures 2 to 4 recognize that the receptacle 50 consists of two partial receptacles, each of the partial receptacles for receiving a corresponding partial lens 30a, 30b is established / trained. In addition, it can be provided that further, for example three or four referencing elements (not shown in the figures) are arranged between the partial lenses 30a, 30b, which reference the partial lens 30b to the partial lens 30a in the X direction. The partial mount for the first partial lens 30a can be smaller than the partial mount for the second partial lens 30b.

The two projection optics 30, 31 can be designed such that the objective 10 has an apochromatic effect.

The Figures 1 to 4 it can also be seen that each of the recordings has a receiving base, at least three of the reference points being designed as referencing elements arranged between the corresponding receiving base and the at least one projection optics received in the corresponding recording. The referencing elements touch both the receiving base and the projection optics and are designed in such a way that they define a primary plane YZ - in the sense of the 3-2-1 rule.

For example, in the Figures 2 to 4 it can be seen that each of the two receptacles 50, 51 has a receptacle base 50a, 51a (the receptacle 5 in Figures 1a to 1c also has a bottom 5a). The bottom of the respective receptacle 50, 51 can, for example, either through the upstream projection optics, as is the case with receptacle 51 in FIG Figures 2 and 4th is the case, or be formed by the projection optics holder 40, as is the case with the receptacle 50 (see Figure 3 ). This applies mutatis mutandis to the partial recordings described above (cf. Figures 2 to 4 ). At least three of the reference points are designed as referencing elements 60-1 to 60-4, 61-1 to 61-4, which are arranged between the respective receiving base 50a, 51a and the respective projection optics 30, 31. Both the respective receiving base 50a, 51a and the respective projection optics 30, 31 are touched by the referencing elements 60-1 to 60-4, 61-1 to 61-4. For example, the second projection optics 31 rests on the referencing elements 61-1 to 61-4, the referencing elements 61-1 to 61-4 being formed on the first projection optics 30. The first projection optics 30, in particular the first partial lens 30a, rests on the referencing elements 60-1 to 60-4, which referencing elements are formed on the projection optics holder 40. Figure 2 it can be seen that these referencing elements 61-1 to 61-4 are formed on the second partial lens 30b. The referencing elements 60-1 to 60-4 and 61-1 to 61-4 each define a different primary level YZ. The different primary planes are preferably parallel to one another. In addition, it is advantageous if all the primary planes YZ are arranged essentially parallel at least to the receiving base 50a of the first receiving element 50 (as seen from the light source).

The Figures 3 and 4th show that the referencing elements 60-1 to 60-4 ( Figure 3 ) and 61-1 to 61-4 ( Figure 4 ) can be designed as projections extending in the direction of the optical axis X. In addition, the Figures 3 and 4th it can be seen that four referencing elements are provided in each receptacle. The fourth referencing element helps, for example, against tilting of the respective projection optics 30, 31 in the receptacle 50, 51. It is entirely conceivable that more referencing elements (five, six or more) are provided.

The referencing elements 60-1 to 60-4 shown ( Figure 3 ) and 61-1 to 61-4 ( Figure 4 ) approximately have the shape of a hemisphere that is flattened on its upper side. Other geometric shapes of the referencing elements are quite conceivable.

The referencing elements 6-1 to 6-3, 60-1 to 60-4, 61-1 to 61-4 can thus be formed on the projection optics holder 4, 40 and / or on one or more projection optics 3, 30, 31. You can form a monolithic structure with the projection optics holder 4, 40 and / or with at least one projection optics 3, 30, 31. If the referencing elements are formed on the projection optics, then it is expedient if they are formed on the optically inactive surfaces of the projection optics.

The Figures 1 to 4 it can also be seen that the referencing elements 6-1 to 6-3, 60-1 to 60-4, 61-1 to 61-4 can be designed as spacers.

It is also in the Figures 1 to 4 it can be seen that the receptacles 5, 50, 51 each have a side wall 5b, 50b, 51b. The side wall 5b in Figures 1a to 1c is formed partly by the projection optics holder 4 and partly by the closing element 7. The side walls 50b, 51b in the Figures 2 to 4 are formed by the projection optics holder 40. At least two more of the reference points, namely those that are not designed as referencing elements, are designed as centering elements 6-4 to 6-6, 60-5 to 60-16 and 61-5 to 61-10, with these at least two centering elements 6 -4 to 6-6, 60-5 to 60-16 and 61-5 to 61-10 between one inner circumference of the side wall 5b, 50b, 51b and the projection optics 3, 30, 31 received in the corresponding receptacle 5, 50, 51 are arranged. The centering elements 6-4 to 6-6, 60-5 to 60-16 and 61-5 to 61-10 touch both the side wall 5b, 50b, 51b and the projection optics 3, 30, 31 and restrict the movement of the at least one Projection optics 3, 30, 31 along the primary plane YZ.

It should be noted here that when the objective 1, 10 is in an assembled state, not all projection optics 3, 30, 31 have to touch the corresponding centering elements 6-4 to 6-6, 60-5 to 60-16 and 61-5 to 61-10 . A certain amount of play of the projection optics 3, 30, 31 in the receptacles 5, 50, 51 along the primary plane YZ is therefore permissible. However, a situation is conceivable when there is no game. For example, spring elements (not shown here) can be provided in the projection optics holder 4, 40 to compensate for play. These spring elements can, for example, be designed in one piece with the projection optics holder 4, 40 or as separate insert parts.

The centering elements 6-4 to 6-6, 60-5 to 60-16 and 61-5 to 61-10 are preferably formed on the projection optics holder 4, 40. In the projection optics holder 4 of the Figures 1a to 1c two centering elements 6-4 and 6-6 are designed as two elevations, which are roughly triangular in a cross-section parallel to the YZ plane and are connected in a lower area of the projection optics holder 4 by a web to provide a (from the front seen) to form V shape. The rotationally symmetrical projection optics 3, for example a lens, can be inserted into this V-shape. The V-shape described is particularly advantageous when using rotationally symmetrical projection optics. Centering elements, which together form a V-shape, can also be used in projection optics holders that accommodate several rotationally symmetrical projection optics.

The one in the Figures 2 to 4 The projection optics holder 40 shown, the centering elements 60-5 to 60-16 and 61-5 to 61-10 are formed on the inner circumference of the side wall 50b, 51b of the corresponding receptacle 50, 51 formed by the projection optics holder 40. The centering elements 60-5 to 60-16 and 61-5 to 61-10 preferably form a monolithic structure with the projection optics holder 40.

Specifically, the centering elements 60-5 to 60-16 and 61-5 to 61-10 in the projection optics holder 40 are designed as centering elevations extending in the direction of the optical axis X, preferably flattened on their upper side.

The longitudinal direction of these elevations is the X direction - the optical axis of the objective 10. In addition, the centering elements 60-5 to 60-16 and 61-5 to 61-10 protrude towards the center of the objective 10, preferably perpendicular to the optical axis X. out of the inside of the projection optics holder 40 out.

The at least one projection optics 30, 31 can have counter elements 60-17 to 60-22, 61-11 to 61-13 corresponding to the centering elements 60-5 to 60-16 and 61-5 to 61-10. The counter-elements 60-17 to 60-22, 61-11 to 61-13 of all lenses 30a, 30b and 31 are formed as depressions corresponding to the centering elevations. This is especially good in Figure 2 recognizable.

The receptacles 5, 50, 51 each have a receptacle opening 5c, 50c, 51c. As already mentioned, each receptacle 5, 50, 51 can be closed or closed by a closing element 7, 70. The closing element 7 of Figures 1a to 1c is designed as a (angular) bracket which, seen from the side, has roughly the shape of a Greek capital letter gamma and, seen from the front, has a centrally located opening so that light emerging from the projection optics 3 can exit the lens 1. The shape of the bracket 7 can also be different. The closing element 7 is fastened to the projection optics holder 4 by latching, screwing, clamping, gluing, for example.

With the lens 10 the Figures 2 to 4 the first receptacle 50 is closed by the second projection optics 31. The second receptacle 51 is closed by means of a fastening clip 70 which has an opening in the center from which the second projection optics 31 protrude.

The closing elements 7, 70 are designed in such a way that light can exit from the corresponding one projection optics 3, 30, 31 and leave the objective 1, 10.

Referring to Figures 2 to 4 It is noticeable that the fastening bracket 70 is attached to the projection optics holder 40 in such a way that it presses the projection optics 30, 31 received in the projection optics holder 40 in a direction opposite to the direction of the optical axis X of the objective 10. The projection optics 30, 31 are fixed in the projection optics holder 40 in such a way that they can no longer move along the optical axis X - the focal length of the objective 10 is thus determined. That is to say, the fastening clip 70 clamps the projection optics 30, 31 in the projection optics holder 40, so that there is no longer any play between the optics 30, 31 in the direction of the optical axis X. In an advantageous embodiment, which is shown in Figure 2 is shown, two projections 70 a are formed on the fastening bracket 70, which define a preferably horizontal line that runs perpendicular to the optical axis X. The projections 70a or elevations protrude from the fastening clip 70 in the direction opposite to the direction of the optical axis X. But there can also be more than two projections 70a.

In addition, the fastening bracket 70 has latching openings 70b that match latching lugs 40b formed on the projection optics holder 40, so that the fastening bracket 70 can latch with the projection optics holder 40. The latching lugs 70b are formed on an outer circumference of the projection optics holder 40.

The objective 10 optionally comprises two, preferably flat, in particular planar diaphragm devices 11 and 12 which are arranged perpendicular to the optical axis X (in the YZ plane). Each diaphragm device 11, 12 has a closed diaphragm edge 11a, 12a. The (first) panel device 11 is designed in one piece with or as the receiving base 50a. The (second) diaphragm device is designed as a separate plate 12. Through openings 12d are provided in the plate which match the referencing elements 9-1 to 9-4 which are designed as elevations. In the assembled state of the lens 10, the elevations 9-1 to 9-4 are received in the through openings 12d. As a result, the position of the plate 12 in the objective 10 in relation to projection optics 30, 31 is determined. Furthermore, both or only one of the diaphragm devices 11, 12 can have one or more (preferably two) spring tab (s) 12b, 12c. Figure 2 shows that only the plate 12 has the spring tabs 12b, 12c (here two as an example). The projection optics 30, 31 are better clamped in the corresponding receptacle 50, 51 by the spring tabs, for example FIGS. 12b, 12c, and the play of the projection optics 30, 31 in the YZ plane is reduced. With two spring tabs, the probability of tilting is also reduced. The two tabs 12b, 12c are preferably arranged to the side of the self-contained panel edge 12a.

As already described, the first projection optics 30 consists of Figures 2 to 4 of two partial lenses 30a, 30b. Figure 5 FIG. 4 shows a section of the lens system from FIG Figure 2 with an XZ plane, ie with a plane that spans the optical axis X and the vertical Z direction. The partial lenses 30a and 30b together are set up to correct at least longitudinal color errors, that is to say have an achromatic effect. The projection optics 30 is therefore a so-called air achromat (see description of the prior art DE 10 2010 046 626 84 and in particular paragraphs [0009] to [0013]). An air achromat has the advantage that several parameters are available that allow a more precise correction of the longitudinal color error. These parameters are, for example, the size of the air gap d1, curvatures of the light entry and exit surfaces of the partial lenses 30a, 30b, and the material of which the partial lenses 30a, 30b are made. A three-lens system has the advantage that the distances d1, d2 can be varied to reduce longitudinal and / or transverse color errors in order to improve the quality of the light distribution generated by the lighting device even further.

The lighting device described above can be used with advantage in a motor vehicle headlight.

The object of the above description is only to provide illustrative examples and to indicate further advantages and special features of the present invention. The above description cannot therefore be interpreted as a restriction of the field of application of the invention or of the patent rights claimed in the claims. For example, in the foregoing detailed description, various features of the invention are summarized in one or more embodiments for the purpose of streamlining the disclosure. This type of disclosure is not to be construed as reflecting the intent that the claimed invention require more features than are expressly mentioned in each claim. Rather, as the following claims reflect, inventive aspects exist in less than all features of a single embodiment described above. (Thus, the following claims are hereby incorporated into this detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.)

Furthermore, while the description of the invention includes the description of one or more embodiments and certain variations and modifications, other variations and modifications are within the scope of the invention, e.g. B. within the abilities and knowledge of those skilled in the art, upon understanding the present disclosure.

The reference numbers in the claims serve only for a better understanding of the present invention and do not in any way restrict the present invention.

Claims (15)

A lighting device of a motor vehicle headlight comprising - An objective (1, 10) and at least one light source (2), wherein a light image (LI) can be generated by the at least one light source (2), the light image (LI) which can be generated by the light source (2) by means of the objective ( 1, 10) can be projected in front of the lighting device in the form of a light distribution, wherein - The objective (1, 10) has at least one projection lens (3, 30, 31) and one projection lens holder (4, 40), wherein - At least one receptacle (5, 50, 51) is formed in the projection optics holder (4, 40), wherein - the at least one receptacle (5, 50, 51) of the at least one projection optics (3, 30, 31) corresponds, - The at least one projection optics (3, 30, 31) is received in the at least one receptacle (5, 50, 51), wherein - A reference point system (6, 60, 61) is defined in the at least one receptacle (5, 50, 51) in order to determine a position of the projection optics (3, 30, 31) received in this receptacle (5, 50, 51) that the light image (LI) lies essentially in a focal plane of the objective (1, 10), wherein - Reference points (6-1 to 6-6, 60-1 to 60-16, 61-1 to 61-10) of the reference point system (6, 60, 61) are arranged according to the 3-2-1 rule, with - The at least one receptacle (5, 50, 51) is closed by means of a closing element (7, 70) in such a way that the at least one projection optics (3, 30, 31) are in the position determined by the reference point system (6, 60, 61) is fixed and held in the at least one receptacle (5, 50, 51). Illumination device according to Claim 1, the objective (1, 10) comprising at least two projection optics (3, 30, 31) and at least two receptacles (5, 50, 51) being formed in the projection optics holder (4, 40), each receptacle ( 5, 50, 51) each correspond to one projection optics (3, 30, 31) and different recordings (5, 50, 51) correspond to different projection optics (3, 30, 31),
each projection optics (3, 30, 31) being received in a receptacle (5, 50, 51) corresponding to these projection optics (3, 30, 31) and different ones Projection optics (3, 30, 31) are recorded in different recordings (5, 50, 51), with - A reference point system (6, 60, 61) is defined in each receptacle (5, 50, 51) in order to determine the position of the projection optics (3, 30, 31) received in this receptacle (5, 50, 51), wherein - Reference points (6-1 to 6-6, 60-1 to 60-16, 61-1 to 61-10) of each reference point system (6, 60, 61) are arranged according to the 3-2-1 rule, with - The reference points (6-1 to 6-6, 60-1 to 60-16, 61-1 to 61-10) of the different reference point systems (6, 60, 61) are designed in such a way that all fixed positions of the projection optics (3rd , 30, 31) are matched to one another in such a way that the optical axes of the different projection optics (3, 30, 31) coincide and that the light image (LI) lies in the focal plane of the objective (1, 10). Device according to claim 2, wherein each receptacle (5, 50, 51) is closed by means of a respective closing element (7, 70), at least one of the closing elements (7, 70) being one of the at least two projection optics (3, 30, 31) is trained. Device according to one of claims 1 to 3, wherein the reference points (6-1 to 6-6, 60-1 to 60-16, 61-1 to 61-10) of the reference point system (6, 60, 61) according to area or Translation-rotation-stop principle of the 3-2-1 rule are arranged. Device according to one of Claims 1 to 4, the at least one receptacle (5, 50, 51) having a receptacle base (5a, 50a, 51a), at least three of the reference points (6-1 to 6-6, 60-1 to 60) -16, 61-1 to 61-10) are designed as referencing elements (6-1 to 6-3, 60-1 to 60-4, 61-1 to 61-4), the at least three referencing elements (6-1 to 6-3, 60-1 to 60-4, 61-1 to 61-4) are arranged between the receiving base (5a, 50a, 51a) and the at least one projection optics (3, 30, 31), both the receiving base ( 5a, 50a, 51a) and the projection optics (3, 30, 31) and define a primary plane (YZ) of the reference point system (6, 60, 61), which is preferably essentially parallel to the receiving base (5a, 50a, 51a) is arranged. Device according to claim 5, wherein the at least one receptacle (5, 50, 51) has a side wall (5b, 50b, 51b), with at least two more of the reference points (6-1 to 6-6, 60-1 to 60-16 , 61-1 to 61-10) are designed as centering elements (6-4 to 6-6, 60-5 to 60-16 and 61-5 to 61-10), the at least two centering elements (6-4 to 6 -6, 60-5 to 60-16 and 61-5 to 61-10) are arranged between an inner circumference of the side wall (5b, 50b, 51b) and the at least one projection optics (3, 30, 31), both the side wall (5b, 50b, 51b) as well as the projection optics (3, 30, 31) and restrict a movement of the at least one projection optics (3, 30, 31) along the primary plane (YZ). Device according to one of claims 1 to 6, wherein the at least one receptacle (5, 50, 51) has a receptacle opening (5c, 50c, 51c), wherein the closing element (7, 5, 50, 51) closing the at least one receptacle (5, 50, 51) 70) in the receiving opening (5c, 50c, 51c) is designed such that light emerging from the at least one projection optics (3, 30, 31) can pass through the closing element (7, 70). Device according to one of Claims 1 to 7, the closing element being designed as a fastening clip (70). Apparatus according to claim 8, wherein the fastening clip (70) is attached to the projection optics holder (4, 40) in such a way that the at least one projection optics (3, 30, 31) received in the projection optics holder (4, 40) in at least one of the directions an optical axis (X) of the lens (1, 10) pushes opposite direction. Device according to Claim 8 or 9, the fastening clip being connected to the projection optics holder (4, 40) by means of a latching connection. Device according to one of claims 1 to 10, wherein the at least one light source (2) comprises a surface light modulator, in particular a DMD chip, and generates the light image (LI) on the surface light modulator, wherein the mirror array of the surface light modulator is preferably in a focal plane of the objective ( 1, 10). Device according to one of Claims 1 to 11, the objective (1, 10) further comprising at least one, preferably flat, in particular planar, diaphragm device (11, 12). Device according to one of Claims 1 to 12, the at least one projection optics (3, 30, 31) consisting of two partial lenses (30a, 30b) and preferably having an achromatic effect. Device according to one of Claims 1 to 13, the objective (1, 10) comprising resilient elements which are set up to tension the at least one projection optics (3, 30, 31) in the at least one receptacle (5, 50, 51) , wherein the resilient elements are preferably arranged in the projection optics holder (4, 40). Motor vehicle headlight with at least one device according to one of Claims 1 to 14.

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