LIGHTING DEVICE OF A MOTOR VEHICLE HEADLIGHT

Description

[0001] The invention relates to a lighting device for a motor vehicle headlight, comprising a projection optics system and a light source unit. The lighting device is preferably a lighting device operating according to the projection principle. The light source unit comprises a surface preferably perpendicular to an optical axis of the projection optics system, wherein the light source unit can generate a light image on the surface. The size of the surface is preferably substantially equal to the size of the light image. The light image that can be generated on the surface can be projected by means of the projection optics system in front of the lighting device in the form of a light distribution, such as a low-beam distribution, a ground-projection light distribution, or a high-beam distribution.The light source unit further comprises a support structure, wherein the support structure has an opening, wherein the opening is arranged and formed to match the surface and the light image can be generated at least on a side of the surface facing the projection optics system. For example, a distance between the surface (or the light image) and the opening is smaller, preferably much smaller, than the dimensions of both the opening and the light image. This means that the surface is arranged to match the opening, for example on or in the opening, in such a way that when the light image is generated on the surface, all of the light emanating from the light image generated on the surface passes through the opening (in the direction of the projection optics system).

[0002] Furthermore, the invention relates to a motor vehicle headlight with at least one such lighting device.

[0003] In prior art lighting devices, the projection optics systems are either not adjustable at all with respect to the light source or can only be adjusted using complex adjustment mechanisms. EP 2 693 109 A2 shows prior art lighting devices.

[0004] The object of the present invention is therefore to provide a lighting device for a motor vehicle headlight which is simple and can be adjusted reliably.

[0005] This object is achieved with a lighting device of the above-mentioned type according to claim 1.

[0006] Because the preferably centered projection optics system rests on the support structure and can be fastened to the support structure (in a desired position), the invention makes use of gravity, wherein the guideability along the longitudinal direction (before fastening) enables simple and reliable positioning of the projection optics system in relation to the surface with the light image. Errors (lens shape deviations, lens thickness tolerances, etc.) can be at least partially compensated for in order to achieve the sharpest possible image, which is particularly important for logo projections. The aforementioned desired position is determined by moving the projection optics system in relation to the light source unit along the longitudinal direction and simultaneously analyzing the generated light distribution, i.e. when the lighting device is in operation, with regard to its quality, for example with regard to its sharpness.

[0007] The projection optics system is also referred to as the lens in the following. Preferably, two elongated guides and guide elements are provided. The guide elements are also elongated, for example. It may be expedient to provide exactly one guide element per elongated guide. The elongated guides can, for example, be designed as trough-shaped receptacles / recesses.

[0008] Preferably, the surface can be formed by mirror surfaces of mirrors of a micromirror array of a surface light modulator, e.g., a DMD chip. However, a light-emitting surface of an LED light source can also function as a surface. Furthermore, the surface can be designed as a light conversion means or light conversion means platelet, which can convert light from a laser light source, e.g., a laser diode, into substantially white light. The surface is preferably flat or non-curved. It is understood that in the aforementioned cases, the LED light sources or laser light sources are part of the light source unit.

[0009] The projection optics system is preferably arranged downstream of the light source unit in the main radiation direction (parallel to the longitudinal direction).

[0010] In a preferred embodiment, the lighting device can be designed as a light module. This means that the lighting device, in an assembled state—i.e., when the projection optics system is attached to the support structure—forms a single structural unit and does not consist of structurally separate elements or subunits that are distributed at different locations, for example, in a motor vehicle headlight.

[0011] It can advantageously be provided that the projection optics system comprises a projection optics holder and at least one projection optics, wherein the at least one projection optics is enclosed in the projection optics holder, wherein the guide elements are arranged on the projection optics holder.

[0012] For example, lenses (three are preferably provided) such as concave, convex, bi-concave, bi-convex, plano-concave, or bi-convex can be used as projection optics. The lenses can be made of different materials (each with a different refractive index) and positioned at different distances from one another. For example, different lenses can have different, coordinated refractive indices. In particular, the lenses can be made of plastics, such as PC (polycarbonate) or PMMA (polymethyl methacrylate), or of optical glasses, such as flint or crown glass.

[0013] In a preferred embodiment, it can be provided that the guide elements are formed integrally with the projection optics holder and in particular form a monolithic structure with the projection optics holder.

[0014] It is advantageous if the projection optics holder rests on the support structure, is movable along the longitudinal direction and can be fastened to the support structure (in a desired position).

[0015] In a preferred embodiment, it can advantageously be provided that the projection optics system comprises two or more, preferably three, projection optics.

[0016] It may be expedient if the projection optics system has an achromatic and / or apochromatic effect or if the projection optics are designed and positioned relative to one another in such a way that the projection optics system has an achromatic and / or apochromatic effect.

[0017] It can advantageously be provided that the guide elements are designed as elevations, wherein the elevations are trapezoidal in a section arranged transversely to the longitudinal direction.

[0018] Furthermore, it can be advantageous for the elevations to protrude downwards.

[0019] In a preferred embodiment, it can advantageously be provided that the elongate guides are designed, for example, as trough-shaped depressions or as holes, through holes and / or elongated holes, wherein the guide elements are, for example, either partially or completely received in the elongate guides.

[0020] Furthermore, it is provided that the projection optics system is movable within a movement range defined by the length of the elongated guides and the projection optics system, preferably the projection optics holder, has a fastening region and the support structure has a counter region corresponding to the fastening region, wherein the movement range, fastening region and the counter region correspond to one another in such a way that the projection optics system, preferably its projection optics holder, can be fastened to the support structure in any position within the movement range in such a way that the fastening region of the projection optics system is at least partially fastened to the counter region of the support structure.

[0021] In the context of the present invention, the term "movement range" is understood to mean the length within which the projection optical system is movable with respect to the light source unit along the optical axis (of the projection optical system) when the guide elements are arranged in the elongated guides.

[0022] In addition, it can advantageously be provided that the range of movement is also defined by the length of the guide elements (along the longitudinal direction), e.g. length of the elevations.

[0023] It may be provided that the attachment of the projection optics system, preferably its projection optics holder, to the support structure is carried out by screwing, gluing, riveting or welding.

[0024] It is provided that the fastening area has at least two, preferably three through-openings and the counter-area has at least two, preferably three receptacles, wherein each receptacle corresponds to a respective through-opening, wherein different receptacles correspond to different through-openings, wherein the fastening area can be fastened to the counter-area by means of at least two, preferably three fastening elements, for example screws, which can be accommodated in the through-openings and in the receptacles.

[0025] It is intended that the through openings are designed as elongated holes extending in the direction of the optical axis, the length of which corresponds to the range of movement.

[0026] It can advantageously be provided that the fastening area is arranged on the outer circumference of the projection optics holder, wherein the through openings are arranged distributed over the area so that they offer a better hold of the projection optics system on the support structure.

[0027] In a preferred embodiment, it can be provided that the through openings or the receptacles are arranged in a triangle.

[0028] It may be useful if the position (or the desired position) is selected depending on a desired image scale or desired image sharpness.

[0029] In a particularly preferred embodiment, it can be provided that the projection optics system, preferably the projection optics holder, has a handling area which is formed on opposite sides of the projection optics system, preferably the projection optics holder.

[0030] The handling area can, for example, enable particularly automated handling or automated detection of the projection optics system 1. The handling area can, for example, be detected by an industrial robot, such as an assembly robot, which performs a precise longitudinal adjustment in the axial direction (in the direction of the optical axis) in order to achieve, for example, a specified image scale or a specified image sharpness.

[0031] Further advantages can arise if the handling area is designed as lateral, preferably tab-shaped elements, preferably tabs, protruding from the projection optics system, preferably from the projection optics holder.

[0032] Furthermore, it can be provided that the lateral tab-shaped elements, preferably tabs, extend from the projection optics holder in a direction orthogonal to the optical axis, preferably horizontally.

[0033] Furthermore, it may be advantageous if the elongated guides each have a stop surface at their ends, so that the respective guide element can only be moved from a first end to a second end of the elongated guide opposite the first end.

[0034] According to the invention, the support structure comprises arms, the arms of the support structure projecting toward the projection optics system, the elongated guides being formed in the arms, and the projection optics system preferably comprising laterally projecting tabs, the guide elements being arranged on the projecting tabs. It may be expedient to provide exactly two arms, arranged laterally of the opening.

[0035] In addition, it may be useful if the arms protrude from a plane containing the opening and extend parallel to the longitudinal direction.

[0036] Particular advantages can arise if the arms form a support surface for the projection optics system.

[0037] It may be useful if exactly one elongated guide is formed in each arm.

[0038] Furthermore, it may be expedient for the tabs to be arranged on the projection optics holder. Particular advantages may arise if the tabs are formed on the projection optics holder, in particular if they form a monolithic structure with the projection optics holder.

[0039] In a particularly preferred embodiment, it can advantageously be provided that the guide elements are arranged on the tabs, in particular formed on the tabs. Particular advantages can arise if the guide elements form a monolithic structure with the tabs. The guide elements preferably protrude downwards from the tabs.

[0040] Furthermore, it can be provided that all elongated guides are of the same length.

[0041] The invention, including further advantages, is explained in more detail below with reference to exemplary embodiments illustrated in the drawing. Fig. 1 a light module in a partially assembled state in perspective view; Fig. 2 the light module of the Fig. 1 in an assembled state; Fig. 3 a cross-section of an enlarged section of a support structure and a projection optics holder of the light module of the Figure 2 ; Fig. 4 the light module of the Figure 2 , shown diagonally from above, and Fig. 5 a cross-section of the light module of the Figure 2 .

[0042] First, Figure 1 This shows a light module for a motor vehicle headlight, which corresponds to a lighting device according to the invention. The light module comprises a projection optical system 1 and a light source unit 2. Figure 1 shows a partially assembled state of the light module in which the projection optical system 1 is not attached to the light source unit 2.

[0043] The light source unit comprises a surface 20 which is perpendicular to an optical axis X of the light module. When the light source unit 2 is in operation, it generates a light image on the surface 20 whose size is (substantially) equal to the size of the surface 20. The Figure 1 It can be seen that the light image is generated on a side 201 of the surface 20 facing the projection optics system 1. The light image generated on the side 201 is projected by the projection optics system 1 in front of the light module in the form of a preferably legally compliant light distribution. In the light module shown, the side 201 is formed by mirror surfaces of mirrors of a micromirror array of a surface light modulator, e.g., a DMD chip.

[0044] The projection optics system 1 comprises a projection optics holder 4, in which three projection optics 5a, 5b, 5cThe projection optics 5a, 5b, 5c are designed as non-rotationally symmetric lenses (see Figure 5 ). The first two lenses 5a and 5b (seen from surface 20) together form a so-called air achromat (see description of the prior art from DE 10 2010 046 626 84 and in particular paragraphs

[0009] to

[0013] ) and thus correct at least longitudinal chromatic aberrations. The air achromat comprising lenses 5a and 5b can, however, also be designed such that transverse chromatic aberrations are also corrected. This can be achieved by optimizing air achromat parameters, such as lens materials, curvatures, spacings, and so on. The third lens 5c in this lens triplet is a diverging lens and essentially determines the size of the light distribution, in particular its height and width.

[0045] It should be noted that the projection optics system 1 also includes other elements such as mounting bracket 15or (not shown) resilient insert elements for clamping the projection optics 5a, 5b, 5c in the projection optics holder 4.

[0046] Since the image generated on side 201 of surface 20 is projected with a projection optical system 1, preferably a lens system, the light module functions according to the projection principle.

[0047] The light source unit 2 also comprises a support structure 3. The support structure 3 has an opening 30wherein the opening 30 is arranged and designed to match the surface 20. For example, the distance of the light image from the edges of the opening 30 is smaller, preferably much smaller than the dimensions of the opening 30 and the light image itself. This means that the surface 20 or the side 201 is arranged and designed to match the opening 30, for example on or in the opening 30, such that when the light image is generated on the surface 20 or on the side 201, substantially all of the light emanating from the light image generated on the surface 20 or on its side 201 passes through the opening 30 (in the direction of the objective or the projection optics system 1). The projection optics system 1 can be designed as an objective.

[0048] Furthermore, the projection optics system 1 has two guide elements 10The guide elements 10 according to this preferred embodiment are identical. The support structure 3 also has two elongated - also identical - guides corresponding to the guide elements 10. 31 Each elongated guide 31 corresponds to a guide element 10, with different guides 31 corresponding to different guide elements 10. In the partially assembled state of the light module (see Figures 2 to 4 ) the guide elements 10 are arranged in the elongated guides 31 along a longitudinal direction X The longitudinal guides 31 are arranged in a guide-like manner. The longitudinal direction X is parallel to the optical axis of the light module or the projection optical system 1. For this reason, the same reference symbol "X" is used for the terms "longitudinal direction" and "optical axis". The longitudinal guides 31 are designed approximately like trough-shaped receptacles or depressions (see Figure 3 ).

[0049] In an assembled state, the projection optics system 1 rests on the support structure 3 and is movable along the longitudinal direction or the optical axis X. This enables a more precise longitudinal adjustment of the projection optics system 1 with respect to the support structure 3, whereby a distance between the projection optics system 1 and the side 201 of the DMD chip can be varied, for example, to adjust the image scale. This means that in a position that corresponds to a proper installation position of the lighting device, e.g., the light module, in a motor vehicle headlight, the lens (the projection optics system) rests on the support structure under the influence of gravity. The direction of gravity corresponds to the "downward" direction.

[0050] In order to mount the projection optics system 1 on the light source unit 2, the projection optics system 1 is placed on the support structure 3 of the light source unit 2 (see arrow D in Figure 1 ), so that the guide elements 10 are received in the elongated guides 31. The projection optics system 1 is then moved back and forth along the longitudinal direction X until an optimal position / orientation (e.g., with regard to sharpness and scale) relative to the surface 20 is reached. The projection optics system 1 is then attached to the support structure, e.g., by screwing, gluing, or welding.

[0051] The guide elements 10 are arranged on the projection optics holder 4. The projection optics holder 4 is formed in one piece. The projection optics holder 4 can, for example, be made of die-cast magnesium or by thixomolding or thixoforming, or be formed as a plastic injection-molded part. The guide elements 10 of the light module shown are thus formed in one piece with the projection optics holder 4, forming a monolithic structure with the projection optics holder. Thus, the projection optics holder 4 of the lens 1 rests on the support structure 3, is movable along the longitudinal direction X, and can be fastened to the support structure.

[0052] It should be noted at this point that the light source unit 2 may have further components that will not be discussed further here. For example, Figure 2 Cooling fins 21a heat sink (not shown) for cooling the light source unit 2. The cooling fins are designed, for example, in the form of pins arranged parallel to the longitudinal direction X of the elongated guides.

[0053] Figure 1 and 3 show that the guide elements are designed as elevations 10 projecting downwards from the projection optics holder 4. The elevations extend in the longitudinal direction X of the elongated guides 31 and have a trapezoidal cross-section. The elongated guides 31 accordingly also have a trapezoidal cross-section. This is particularly well-suited to Figure 3 recognizable.

[0054] Because the guide elements 10 are arranged or accommodated in the elongated guides 31 in a guide-like manner, the projection optical system 1 is displaceable, in particular back and forth, with respect to the light source unit 2 along the longitudinal direction X of the elongated guides 31 parallel to the optical axis. The length L the elongated guides 31 and optionally also a length of the elevations 10 define a range of motion B, within which the projection optical system 1 is movable with respect to the light source unit 2.

[0055] Furthermore, the Figures 1 , 2 and 4 It can be seen that the projection optics holder 4 has a fastening area 12 wherein the support structure 3 has a counter-area corresponding to the fastening area 12 33The movement range B, fastening range 12 and the counter-range 33 correspond to each other in such a way that the projection optics holder 4 can be fastened to the support structure 3 in any position within the movement range B in such a way that the fastening range 1 of the projection optics system 1 is at least partially fastened to the counter-range 33 of the support structure 3. In the illustrated light module, screws were used as an example 6a, 6b, 6c as the fastening means. Gluing, riveting, or welding are also conceivable. The fastening area 12 comprises three (elongated) through holes 120, 121, 122. The opposite area 33 includes three recordings 330, 331, 332.Each receptacle 330, 331, 332 corresponds to a respective through-opening 120, 121, 122. Different receptacles 330, 331, 332 correspond to different through-openings 120, 121, 122. The fastening area 12 is arranged on the outer circumference of the projection optics holder 4. Through-openings 120, 121, 122 are distributed over the area 12, so that they offer a better hold of the projection optics system 1 on the support structure 3, in particular during the aforementioned adjustment by back and forth movement. A summary of the Figures 1 and 4 It can be seen that the through openings 120, 121, 122 (and also the receptacles 330, 331, 332) are arranged in approximately a triangle when viewed from above as well as from the front.

[0056] The through openings 120, 121, 122 have a length corresponding to the movement range B in the direction of the optical axis X, so that the movement range B can be utilized to the maximum.

[0057] The receptacles 330, 331, 332 are designed as screw bosses. To secure the projection optics system 1 or its projection optics holder 4, the (three) screws 6a, 6b, 6c are screwed through the through-openings 120, 121, 122 into the screw bosses 330, 331, 332.

[0058] The position in which the projection optics system 1 is attached to the support structure is determined and selected depending on a desired quality of the light distribution, for example on a desired image scale.

[0059] Furthermore, the Figures 1 to 4 It can be seen that the projection optics holder 4 has a handling area 13 The handling area 13 is on opposite sides 14a, 14b of the projection optics holder 4. It is in the Figures 3 and 4It is particularly clearly visible that the handling area 13 protrudes from the sides 14a, 14b of the projection optics holder 4 and has approximately the shape of tabs that extend horizontally away from the projection optics holder 4.

[0060] The handling area 13 is provided to facilitate, in particular, automated handling or automated detection of the projection optics system 1. The handling area 13 can be detected, for example, by an industrial robot, such as an assembly robot, which performs a precise longitudinal adjustment in the axial direction X, for example, to achieve a predetermined image scale.

[0061] In a light module with such a lens 1, the quality of the optical image can be improved. In particular, image sharpness can be improved and aberrations caused by lens shape deviations, lens thickness tolerances, etc. can be at least partially compensated. This can be particularly advantageous for light modules or lighting devices used to generate logo projections or various floor projection light distributions.

[0062] The elongated guides 31 each have a stop surface at their ends 31a, 31bsuch that the respective guide element 10 is only movable from a first end to a second end of the corresponding elongated guide 31 opposite the first end. As a result, a longitudinal adjustment of the lens 1 with respect to the support structure 3 in the axial direction X (direction of the optical axis) is limited to the predetermined length L.

[0063] The Figures 1 to 3It can be seen that the elongated guides 31 in the support structure 3 are formed by arms 32 projecting in the direction of the projection optics system 1. The arms 32 project from a plane containing the opening 30 and extend parallel to the longitudinal direction X of the elongated guides 31 formed therein. Precisely one elongated guide 31 is formed in each arm 32. The arms 32 are arranged laterally of the opening 30 and are connected by a connecting web 34. The connecting web 34 also projects from the support structure 3 in the direction of the optical axis X and partially encloses the opening 30 (for example, from above). The arms 32 and the connecting web 34 together provide a support surface for the projection optics holder 4 of the projection optics system 1.

[0064] The projection optics holder 4 has two tabs 11 on the opposite sides 14a, 14b. The tabs 11 protrude laterally from the projection optics holder 4 and extend flat in a horizontal direction. In addition, two of the three through-openings 120 and 122 are formed in the tabs 11. The handling area 13 is formed integrally with the tabs 11. In addition, the guide elements 10 are formed on the protruding tabs 11. It is shown in the Figures 1 and 3 It is particularly clearly visible that each guide element 10 is arranged at a distal end 11a of the corresponding tab 11.

[0065] Such an arrangement of the guide elements 10 improves handling during adjustment / positioning of the lens 1 on the support structure 3 and thus reduces the risk of tilting / jamming of the guide elements 10 in the elongated guides 31. Furthermore, an arrangement of the guide elements 10 as "wide" as possible from one another provides stable support and guidance of the projection optics system 1.

[0066] The terms used "top", "bottom", "vertical" and "horizontal" refer to a customary, practical installation position of the lighting device or the light module in a motor vehicle headlight installed in a motor vehicle, whereby, as already mentioned, the "downward" direction is the same as the direction of gravity.

[0067] The purpose of the above description is merely to provide illustrative examples and to indicate further advantages and features of the present invention. The above description should therefore not be interpreted as limiting the field of application of the invention or the patent rights claimed in the claims. In the above detailed description, for example, various features of the invention have been grouped together in one or more embodiments for the purpose of streamlining the disclosure. This manner of disclosure should not be understood to reflect an intention that the claimed invention requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects are present in fewer than all features of a single embodiment described above.(Thus, the following claims are hereby incorporated into this Detailed Description, with each claim standing alone as a separate preferred embodiment of the invention.)

[0068] Furthermore, although 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., within the ability and skill of those skilled in the art, based on an understanding of the present disclosure. The invention is limited only by the appended claims.

[0069] The reference numerals in the claims are intended only to facilitate understanding of the present invention and in no way imply a limitation of the present invention.

Claims

1. Illumination device of a motor vehicle headlamp comprising a projection optics system (1) and a light source unit (2), the light source unit comprising a surface (20), wherein - the light source unit (2) can generate a light image on the surface (20), wherein the light image which can be generated on the surface (20) can be projected in front of the illumination device in the form of a light distribution by means of the projection optics system (1), wherein - the light source unit (2) comprises a carrier structure (3), wherein - the carrier structure (3) has an opening (30), the opening (30) being arranged and designed to match the surface (20) and the light image being capable of being generated at least on a side (201) of the surface (20) facing the projection optics system (1), wherein - the projection optics system (1) has guide elements (10) and the support structure (3) has elongate guides (31) corresponding to the guide elements (10), the guide elements (10) being arranged in the elongate guides (31) such that they can be guided along a longitudinal direction (X) of the elongate guides (31), wherein - the projection optics system (1) rests on the support structure (3), is movable along the longitudinal direction (X) and can be fastened to the support structure (3), wherein the projection optics system (1) is movable within a range of movement (B) defined by the length (L) of the elongate guides (31) and the projection optics system (1) has a mounting region (12) and the support structure (3) has a counter-region (33) corresponding to the mounting region (12), wherein the movement area (B), fastening area (12) and the counter area (33) correspond to one another in such a way that the projection optics system (1) can be fastened to the support structure (3) in any position within the movement area (B) in such a way that the fastening region (12) of the projection optics system (1) is at least partially fastened to the mating region (33) of the support structure (3), wherein the fastening region (12) has at least two, preferably three through openings (120, 121, 122) and the mating region (33) has at least two, preferably three receptacles (330, 331, 332), wherein each receptacle (330, 331, 332) corresponds to a respective through opening (120, 121, 122), wherein different receptacles (330, 331, 332) correspond to different through-openings (120, 121, 122), wherein the fastening region (12) can be fastened to the mating region (33) by means of at least two, preferably three fastening elements (6a, 6b, 6c), for example screws, which can be received in the through-openings (120, 121, 122) and in the receptacles (330, 331, 332), and wherein the through openings (120, 121, 122) are elongated and extend in the direction of the optical axis (X), characterized in that the support structure (3) has arms (32), wherein the arms (32) of the support structure (3) project in the direction of the projection optics system (1), wherein the elongated guides (31) are formed in the arms (32), and the projection optics system (1) has projecting tabs (11), wherein the guide elements (10) are arranged on the projecting tabs (11).

2. Illumination device according to claim 1, wherein the projection optics system (1) comprises a projection optics holder (4) and at least one projection optics (5a, 5b, 5c), wherein the at least one projection optics (5a, 5b, 5c) is mounted in the projection optics holder (4), wherein the guide elements (10) are arranged on the projection optics holder (4).

3. Illumination device according to claim 2, wherein the projection optics holder (4) rests on the support structure (3), is movable along the longitudinal direction (X) and can be fastened to the support structure (3).

4. Illumination device according to claim 2 or 3, wherein the projection optics system (1) comprises two or more projection optics (5a, 5b, 5c).

5. Illumination device according to claim 4, wherein the projection optics system (1) has an achromatic and / or apochromatic effect.

6. Illumination device according to one of claims 1 to 5, wherein the position is selected as a function of a desired image scale or desired image sharpness.

7. Illumination device according to one of claims 1 to 6, wherein the projection optics system (1), preferably the projection optics holder (4), comprises a handling area (13) which is formed on opposite sides (14a, 14b) of the projection optics system (1), preferably of the projection optics holder (4).

8. Illumination device according to claim 7, wherein the handling area (13) is formed as lateral elements, preferably tabs, protruding from the projection optics system (1), preferably from the projection optics holder (4).

9. Illumination device according to claim 8, wherein the lateral tab-shaped elements, preferably tabs, extend from the projection optics holder (4) in a direction orthogonal to the optical axis (X), preferably horizontally.

10. Illumination device according to any one of claims 1 to 9, wherein the elongate guides (31) each have a stop surface (31a, 31b) at their ends, so that the respective guide element (10) is movable only from a first end to a second end of the elongate guide (31) opposite the first end.

11. Motor vehicle headlamp comprising at least one illumination device according to any one of claims 1 to 10.