METHOD FOR MOUNTING A HEAD-UP DISPLAY, AS WELL AS HEAD-UP DISPLAY

Description

[0001] One aspect of the invention relates to a method for assembling a head-up display. Another aspect of the invention relates to a head-up display for a motor vehicle.

[0002] Head-up displays in motor vehicles typically have a housing. This can be made up of several sub-areas. For example, in this context it can have a cover module and a base module. These two components can be joined together. For example, plug-in connections, snap-in connections, screw connections, and the like can be provided here. In this regard, the cover module has an outer housing. The base module can also have an outer housing. These two parts, in the form of the outer housings or shells, then form the entire housing of the head-up display. In this respect, they are therefore external visible components of the head-up display. An image generation unit is usually arranged in a head-up display. This generates the images that can be projected with the head-up display onto an external projection surface, such as a window of the vehicle.In addition, a head-up display has at least one mirror inside the housing. The light rays generated by the image generation unit are reflected by this mirror. However, head-up displays can also be provided with two separate mirrors inside the housing. This results in multiple deflection or multiple reflection of the light rays generated by the image generation unit. A first mirror, which is arranged closer to the image generation unit in the beam path from the image generation unit to an exit window of the head-up display, is also referred to as a folding mirror. The second mirror, which is arranged downstream of the beam path, deflects the light rays, in particular towards this exit window of the head-up display.To ensure precise light deflection and thus light emission, and thus a sharp image display, the mirrors, especially the first mirror, must be positioned very precisely within the housing. However, undesirable positioning tolerances can occur during installation of the head-up display.

[0003] It is known that such a first mirror is attached, for example, with an additional cover to an optical chamber of the head-up display located inside the housing, using a snap connection or is glued to this optical camera. In both cases, however, the tolerance chain across this optical chamber is very long. This means that any resulting mirror tilt produces an incorrect virtual image position. If the mirror is glued to the optical chamber, the different expansion coefficients of the materials can cause the mirror to warp, thereby distorting the image to be generated and projected. With the snap-connected option, tolerances arise which, due to temperature differences and the ongoing service life of the head-up display, can lead to positional tolerances, which can also be accompanied by rattling.In this context, unwanted noises may also be generated. The generated image may also tremble.

[0004] Head-up displays are known, for example, from the documents JP2020138673 A, US2013155520 A1 and DE202020107309 U1.

[0005] It is an object of the present invention to provide a method for assembling a head-up display, as well as such a head-up display, in which the positioning of a first mirror inside the head-up display is improved.

[0006] This object is achieved by a method and a head-up display according to the independent claims.

[0007] One aspect of the invention relates to a method for assembling a head-up display, comprising the following steps: Providing a first mirror of the head-up display; attaching a first elastic compression element to a first edge region of a rear side of the first mirror and attaching a second elastic compression element to a second edge region of the rear side of the first mirror; inserting the first mirror with the compression elements arranged thereon into a cover module of a housing of the head-up display and setting a pre-assembly position of the first mirror in the cover module, in which the compression elements rest against support surfaces of the cover module;Attaching a base module of the housing, which is separate from the cover module, to the cover module, wherein, upon connecting the base module to the cover module, a front side of the first mirror is contacted by contact elements of the base module, and upon further joining of the base module to the cover module, the first mirror is pressed into a final assembly position, wherein for this purpose the compression elements are compressed and the first mirror is pressed against the support surfaces of the cover module.

[0008] Such a design can at least significantly reduce the problems explained above regarding the secure and precise positioning of this first mirror inside the head-up display. This procedure now makes it very easy to move the first mirror, preconfigured with the compression elements, into the pre-assembly position. Therefore, it is not yet necessary to precisely position the first mirror in the final position on a corresponding housing part before the cover module is joined to the base module. The pre-assembly position is achieved, in particular, by simply inserting the first mirror into the cover module. This pre-assembly position is therefore not yet defined as the final position or assembly position.This approach can therefore support a rapid assembly scenario, as this pre-assembly position can also be set very easily and quickly. Specifically, the cover module is essentially turned upside down. The trough-shaped cover module is thus positioned so that the trough opening faces upwards or essentially upwards. This makes it particularly easy to insert the preconfigured first mirror into the interior of the cover module from above, thus allowing the pre-assembly position to be reached very easily and precisely. This allows for easy adjustment of the first mirror into the cover module as a pre-assembly position.

[0009] Furthermore, the compression elements ensure that the first mirror does not come into direct contact with the support surfaces. This occurs only indirectly via the compression elements. This also protects the first mirror from undesired influences, particularly on the rear side, caused by the support surfaces. Due to the elastic compression elements, the first mirror can then be moved in a variety of ways relative to the support surfaces. This is because the compression properties of the compression elements, as intended, enable a desired and defined relative movement of the first mirror to the support surfaces in the subsequent assembly scenario. This is particularly advantageous in the proposed assembly scenario.This allows for an automatic position change of the first mirror, particularly during assembly of the cover module to the base module, from the pre-assembly position to the final assembly position. This can be achieved very precisely thanks to the compression capability of the compression elements. This allows the desired final assembly position of the first mirror to be achieved very precisely, particularly in relation to the support surfaces, by adjusting the position of the first mirror very simply and indirectly via the assembly of the cover module to the base module.

[0010] The proposed assembly method therefore specifically aims for the first mirror to move in a defined manner from the pre-assembly position when the cover module is joined to the base module. In particular, it is automatically pushed into the final assembly position. Since the compression elements can also be deformed, and in particular compressed, very evenly, the final assembly position is reached very precisely. In both the pre-assembly position and the final assembly position, the compression element(s) achieve a further advantage in that the first mirror is arranged on these support surfaces with damped mounting. In particular, this also enables relative movements between the first mirror and the support surfaces in the installed state, and in particular also achieves vibration damping.

[0011] In one embodiment, the first mirror is adjusted in the cover module in the pre-assembly position. This makes it particularly easy to move the first mirror into the cover module. Furthermore, the pre-assembly position is therefore also quick and easy to reach. Simple adjustment into the cover module therefore requires no further complex assembly processes to reach the pre-assembly position. In this pre-assembly position, the first mirror is arranged in particular in an inclined position in the cover module. This advantageously also prevents the first mirror from undesirably falling over in the pre-assembly position. The position adjusted in this regard is also maintained relatively securely. In one embodiment, when the pre-assembly position is adjusted, the first mirror is placed with an edge, in particular an upper edge, on at least one support of the cover module.This provides appropriate support for the installation position at this edge as well. Thus, on the one hand, the mirror rests directly on these narrow, particularly web-like, supports, allowing the mirror to be securely positioned in this installation scenario through the gravity of the first mirror. On the other hand, the compression elements indirectly rest on the support surfaces, which are inclined in this installation position of the cover module.

[0012] In one embodiment, the compression elements are provided as elongated strips. In one embodiment, they can extend over at least 60 percent, in particular at least 70 percent, of the length of the respective edge region of the rear side. In particular, the compression elements are attached to this rear side parallel to a further edge that delimits the edge region. This shape and orientation are advantageous in that it enables strip-shaped direct contact between a compression element and a corresponding support surface. This allows, on the one hand, the pre-assembly position to be reached very precisely. However, the relative movement of the first mirror during compression of the compression elements and during movement of the first mirror towards the stationary support surfaces in the further assembly scenario is also particularly advantageous.This enables particularly uniform compression of a compression element across its respective geometric configuration. Preferably, the support surface is designed without interruption, and a compression element rests flatly, in particular over its entire surface, against such a support surface with its strip-shaped, exposed element surface. This advantageously enables the additional scenarios mentioned above during assembly of the head-up display.

[0013] In addition, this edge-side attachment of the compression elements creates a relatively component-saving construction that can interact mechanically with the respective support surfaces in a particularly advantageous manner.

[0014] In one embodiment, the compression elements are provided as foam strips. In particular, they can be cuboid-like or rod-shaped. The foam strip design in particular enables easy handling for attachment to the first mirror. On the other hand, the desired compressibility is achieved particularly advantageously. Last but not least, a foam design is also permanently functional and thus materially durable. Even in the final installed state and in the permanently compressed state of a compression element, the set final assembly position of the first mirror can be precisely maintained.

[0015] In one embodiment, a compression element is glued to the back of the first mirror. The compression elements are arranged, in particular, only at these edge regions.

[0016] In one embodiment, when connecting the base module to the cover module, insertion elements of one module are first inserted into corresponding insertion receptacles of the other module. This also means that the initially separately provided components relating to the base module and the cover module are moved towards one another. Starting with a subsequent start of the joining process, the insertion elements and the insertion receptacles are brought towards one another. Once a relevant assembly state has been reached in which the insertion of the insertion elements into the insertion receptacles is just beginning and thus the engagement of the insertion elements in the insertion receptacles begins, it is also defined in this state that the contact elements are arranged at a distance from and thus contactless with a front side of the first mirror.This ensures that the first mechanical coupling engages via the insertion device with the insertion elements and the insertion receptacles, before contact elements come into contact with the front and would already exert a force on the first mirror. The initial engagement of the insertion elements and the insertion receptacles achieves a base position between the base module and the cover module which can no longer be moved undesirably and therefore no longer circumferentially in a plane perpendicular to this assembly direction when contact elements subsequently touch the front of the first mirror. This then also enables the contact elements on the front of the first mirror to touch in a very directed and defined manner in the further assembly scenario and for the contact elements to then exert a force on the front of the first mirror in a further assembly scenario.In this context, the insertion elements and insertion receptacles which are already guided into one another and are not yet connected to one another in the respective final insertion state also form a mechanical guide in order to be able to achieve the corresponding pressing of the contact elements onto the front side of the first mirror.

[0017] This allows for a highly effective and highly functional assembly concept, especially during this intermediate assembly stage. Undesirable shifts in the position of individual components relative to each other can be avoided. This enables the subsequent direct mechanical contact between contact elements and the front of the first mirror to be achieved very precisely and at exactly the desired time during the assembly scenario.

[0018] In one embodiment, as the insertion process of the insertion elements into the insertion receptacle continues, the front side is then mechanically contacted directly by the contact elements, starting from an already achieved engagement of these insertion elements in the insertion receptacles. Starting from this then achieved contact state between the contact elements and the front side of the first mirror, the compression elements are automatically compressed upon further assembly of the cover module with the base module and thus upon further insertion of the insertion elements into the insertion receptacles, thereby automatically pushing the first mirror toward the support surfaces.This guided approach of the contact elements to the front of the first mirror by the insertion device, followed by the controlled and controlled pressing of the contact elements against the front, and the resulting automatic compression of the compression elements and the resulting automatic defined relative movement of the first mirror toward the support surfaces, also allows the final assembly position of the first mirror to be achieved with particularly precise and finely controlled adjustments. This also prevents unwanted abrupt forces acting on the first mirror and abrupt position adjustments.

[0019] In one embodiment, during the further insertion process of the insertion elements into the insertion receptacle during the assembly of the floor module and the ceiling module, the contact elements, which are then already in contact with the front side of the first mirror, are automatically moved relative to the front side in the contact state. This relative movement generates a force on the first mirror which moves this first mirror in the direction of the support surfaces. Since the elastic design of the compression elements compresses the compression elements during this movement of the mirror, this corresponding mirror movement towards the support surfaces is also made possible in a particularly advantageous manner. Compression elements enable this movement on the one hand, and on the other hand they form a damping element which supports this movement of the mirror.Because the compression of the compression elements generates a certain counterforce, the movement of this mirror is guided and directed in a particularly advantageous manner. Furthermore, this design also enables a very uniform movement of the mirror toward these support surfaces. In particular, it advantageously enables a linear or essentially linear movement of the first mirror toward the support surfaces. This essentially enables the final assembly position to be parallel to the pre-assembly position.

[0020] In one embodiment, the direction of the force is generated due to the oblique orientation of the contact elements at an angle different from 0° and different from 180° to the assembly direction in which the base module is joined to the cover module. Thus, the direction of the force acting on the first mirror is essentially not parallel to the particularly linear assembly direction in which the base module is joined to the cover module. In particular, this assembly direction is to be understood as the assembly path along which the insertion elements and the insertion receptacles engage with each other.

[0021] This orientation between the force direction and the assembly direction allows for a highly favorable assembly scenario for the first mirror to be moved from the pre-assembly position to the final assembly position. This also creates the possibility of achieving a relative position between the cover module and the base module during this assembly process, which occurs particularly linearly in the assembly direction, while simultaneously automatically achieving a relative movement of the first mirror to the support surfaces, which is oriented differently.Although various relative movements occur during this simultaneous assembly of the cover module with the base module and thus the first mirror is then also moved relative to the cover module and the base module, the cover module and the base module can still be assembled very precisely and at the same time the final assembly position of the first mirror can be automatically reached exactly.

[0022] In one embodiment, the joining or connecting of the base module to the cover module is performed by a linear joining movement. This occurs, in particular, at least starting from the position in which the insertion elements are just engaging the insertion receptacles. If necessary, the prior bringing together of the base module and the cover module can also already occur in this joining direction, and in this regard, a linear joining movement can be performed.

[0023] In one embodiment, the floor module is provided with a one-piece outer housing. The contact elements are integrally formed on the outer housing. In particular, in such an embodiment, it can be provided that this floor module outer housing is manufactured in one piece with the contact elements. For example, this can be a plastic component. It can then be manufactured as an injection-molded component.

[0024] In one embodiment, the base module is provided with an outer housing, and a separate component for creating an optical chamber in the head-up display is installed in the outer housing. This separate component can have a base plate and a frame molded onto the base plate. This forms a shaft or chamber, which then also represents the intended creation of an optical chamber in the head-up display.

[0025] It is also possible for the head-up display to have a second mirror. This is a separate mirror from the first mirror. The second mirror can be installed in the outer housing. The second mirror is intended to redirect or reflect light that was deflected by the first mirror and that was reflected from the first mirror to the second mirror to an exit window of the housing of the head-up display. The floor module, which in the aforementioned embodiment has the outer housing and the separate component and / or the second mirror, is provided as a floor module pre-assembled with the relevant components. This pre-assembled floor module can then be connected to the cover module, as explained above.

[0026] In one embodiment, the contact elements can be molded onto the component intended for creating an optical chamber. This component can also be manufactured in one piece in the embodiment. It can also be made of plastic.

[0027] It is therefore possible for contact elements of the base module to be formed on the outer housing or on the component, or in a further embodiment, to be formed as contact elements on both the component and the outer housing. In each case, a one-piece design can be provided.

[0028] A further aspect of the invention relates to a head-up display for a motor vehicle. The head-up display has a housing. It has a cover module and a base module. A first mirror of the head-up display is arranged in the housing, with which light from an image generation unit of the head-up display can be deflected or is deflected. In particular, this first mirror is intended to redirect the light from the image generation unit to a second mirror of the head-up display, if present, or to redirect it directly to an exit window of the head-up display if the second mirror is not present.

[0029] Elastic compression elements are preferably arranged on edge regions of a rear side of the first mirror. In the final assembled state of the first mirror in the housing, these compression elements rest, in particular directly, on support surfaces of the cover module. The base module has contact elements, in particular integrated and thus formed integrally therewith, which rest on a front side of the first mirror intended for reflection, such that the first mirror is subjected to a force in the direction of the support surfaces and, as a result, the compression elements are compressed in the final assembled state of the first mirror and the first mirror is pressed against the support surfaces. In this regard, an indirect pressing is formed, since the first mirror does not have direct contact with the support surfaces, but rather the compression elements are located therebetween.The advantages achievable with such a head-up display have already been mentioned above.

[0030] In one embodiment, the contact elements are formed with strip-shaped contact surfaces oriented obliquely to a longitudinal axis of the head-up display. The assembly direction of the modules can be oriented in the direction of this longitudinal axis. These strip-shaped contact surfaces face the edge regions of the front side of the first mirror. In particular, they lie directly against these edge regions of the front side. In one embodiment, the edge regions of the front side are opposite the edge regions of the rear side, where the compression elements are arranged. Thus, in one embodiment, the contact surfaces of the contact elements and the strip-shaped compression elements are oriented parallel to one another in pairs on opposite sides of the first mirror. This enables a very space-saving yet highly functional design.This is particularly important in order to be able to move the first mirror precisely from the pre-assembly position to the final assembly position, while at the same time being able to maintain the final assembly position precisely.

[0031] In one embodiment, the contact surfaces of the contact elements are smoothed. This means that their surface roughness is reduced, for example, by milling or polishing. This is particularly provided in an embodiment in which the contact elements are part of the outer housing of the floor module and are, in particular, made of die-cast material.

[0032] In one embodiment, the front side of the first mirror, particularly at the edge areas intended for the direct contact of the contact elements of the floor module, can be provided with a reflective film. This can then also be used as an intermediate layer between the glass material of the mirror and the contact element, in particular as a sliding film for the contact element. The film can be attached by optical bonding.

[0033] A further aspect of the invention also relates to a motor vehicle with such a head-up display.

[0034] Embodiments of the invention are explained in more detail below with reference to schematic drawings. They show: Fig. 1 is an exploded view of an embodiment of a head-up display according to the invention; Fig. 2 is an exploded view of the head-up display according to Fig. 1 , where compared to Fig. 1 some components are already connected to each other; Fig. 3 a perspective view of subcomponents of the head-up display according to Fig. 1 in an intermediate assembly state; Fig. 4 the components according to Fig. 3 in one to Fig. 3 subsequent intermediate assembly state; Fig. 5 a representation of components of the head-up display in a Fig. 4 subsequent intermediate assembly state; Fig. 6 the representation of the components in Fig. 5 in one on Fig. 5 subsequent intermediate assembly state; Fig. 7 a perspective sectional view of the assembly state in Fig. 6 ; and Fig. 8 a sectional view of the fully assembled head-up display.

[0035] In the figures, identical or functionally identical elements are provided with the same reference symbols.

[0036] In Fig. 1 1 shows an exploded view of an exemplary embodiment of a head-up display 1. The head-up display 1 can be installed in a motor vehicle. In this regard, the head-up display 1 can be used to project optical information, for example, onto a windshield so that it can be perceived by a vehicle occupant sitting in a driver's seat in the field of vision when looking through the windshield. The head-up display 1 has a housing 2. This housing 2 has a cover module 3. The cover module 3 is trough-shaped. It can also be referred to as a shell. It has a viewing window 4 in its upper area. The light rays generated by an image generation unit 5 of the head-up display 1 emerge from the housing 2 through this viewing window 4. The window 4 is formed here by a transparent wall.

[0037] The head-up display 1 further comprises a base module 6. The base module 6 has at least one outer housing 7. This can be connected to an outer housing 8 of the cover module 3 to form the housing 2. The outer housings 7 and 8 are separate parts in this respect. For example, the outer housing 7 can be formed as a die-cast component. The outer housing 8 can be formed from plastic, for example. It can be an injection-molded component. The outer housings 7 and 8 can also be referred to as shells.

[0038] The head-up display 1 further comprises a component 9. This is a separate component here. In the exemplary embodiment, the component 9 comprises a base plate 10 and a frame part 11. The component 9 is particularly formed in one piece. It forms a component that provides an optical chamber 12 of the head-up display 1.

[0039] In addition, the head-up display 1 in the exemplary embodiment has a first mirror 13. The first mirror 13 has a rear side 14 and a front side 15. The front side 15 is provided and arranged in the housing 2 as intended to deflect or reflect light rays emitted by the image generation unit 5.

[0040] On the rear side 14, a compression element 18 and 19 are arranged at edge regions 16 and 17, respectively. In this exemplary embodiment, the compression elements 18 and 19 are foam parts. They are arranged at these edge regions 16 and 17 of the rear side 14. In this regard, adhesive bonding can be provided, for example. The compression elements 18 and 19 are strand-like or rod-shaped components here. They can accordingly be cuboid-shaped. In addition, in the exemplary embodiment, the head-up display 1 has a second mirror 20. In the assembled state of the head-up display 1, this mirror is arranged such that the light rays deflected by the first mirror 13 strike a front side 21 of the second mirror 20 and from there are deflected or reflected to the exit window 4.

[0041] The first mirror 13 is arranged in a niche 22 of the cover module 3 when installed.

[0042] As in Fig. 1 As can be seen, the base module 7 in the exemplary embodiment has two contact elements 23 and 24. These contact elements 24 have strip-shaped contact surfaces 25 and 26. As in Fig. 1 As can be seen, these contact surfaces 25 and 26 are oriented at an angle. This applies in particular to a longitudinal axis A of the head-up display 1.

[0043] In Fig. 2 The head-up display 1 is shown in an exploded view. The base module 6 is shown and both the second mirror 20 and the component 9 are installed in the outer housing 7. The image generation unit 5 is also installed, which is shown in Fig. 2 can no longer be recognized in this regard. Likewise, the first mirror 13 is installed in the cover module 3 and is arranged in the niche 22.

[0044] Regarding the assembly of the head-up display 1, the cover module 3 is preferably turned over so that it is upside down (see Fig. 3 )t. This provides access to the interior 3a of the cover module 3, in particular from above. The first mirror 13 is provided. In this regard, it is provided here that the compression elements 18 and 19 are already arranged, in particular fastened, on the edge regions 16 and 17. The thus provided first mirror 13 is then inserted into the cover module 3. For this purpose, the mirror 13 is inserted into the cover module 3. In this case, the mirror 13 is arranged with the compression elements 18 and 19 in a pre-assembly position. In this regard, Fig. 4 A first support surface 27 can be seen in the recess 22. This support surface 27 can be strip-shaped, in particular. It is inclined relative to the longitudinal axis A. A further support surface 28 can be formed on the opposite side. This is intended for the direct contact of the further compression element 18.

[0045] In Fig. 4 The cover module 3 is shown with the first mirror 13 arranged in the pre-assembly position. In this pre-assembly position, the mirror 13 rests with a peripheral edge 29 on web-like supports 30 and 31 of the cover module 3, in particular the niche 22. In addition, the bar-shaped compression elements 18 and 19 rest on the aforementioned support surfaces 27 and 28. The pre-assembly position is particularly characterized in that the first mirror 13 is only set in this niche 22 and is positioned at an inclination due to its inclination. As can be seen, the supports 30 and 31 have elevations 32 and 33. This prevents the first mirror from slipping out of the niche on the supports 30 and 31. The inclined position in this respect is maintained. Furthermore, Fig. 4 Edge areas 15a and 15b of the front side 15 are also shown. These are directly opposite the edge areas 16 and 17 of the rear side 14.

[0046] Starting from this intermediate assembly state, the assembly is then carried out as shown in Fig. 5 the floor module 6, in particular as it is in a pre-assembly module as shown in Fig. 2 is already prefabricated, mounted on the cover module 3. In the exemplary embodiment, the base module 6 is placed onto the cover module 3 from above using a linear joining direction P.

[0047] In Fig. 6 is based on the representation in Fig. 5 A further combined state has already been shown. As is particularly evident in Fig. 6 As can also be seen, the base module 6 has an insertion element 34. In this embodiment, this is formed directly onto the contact element 23. The insertion element 34 is intended for insertion into an insertion receptacle 35 ( Fig. 7 ), which is formed on the cover module 3. A further insertion element 36 ( Fig. 6 ) is formed at the opposite end of the base module 6. In this embodiment, this is not formed directly on the further contact element 24, but separately and at a distance from it. Furthermore, a further insertion receptacle 37 is shown, which is formed in the cover module 3. In Fig. 7 In this regard, a perspective sectional view is shown in which the cover module 3 is shown in section in the area of ​​the insertion receptacle 35.

[0048] Based on the Fig. 6 Once the intermediate assembly position has been reached, the base module 6 is moved linearly towards the cover module 3. This is followed by insertion of the insertion elements 34 and 36 into the insertion receptacles 35 and 37. When the insertion elements 34 and 36 begin to engage with each other in the insertion receptacles 35 and 37, the contact elements 23 and 24, in particular the strip-shaped contact surfaces 25 and 26, are arranged at a distance from the front side 15 of the first mirror 13. As the insertion process continues, in which the insertion elements 34 and 36 are inserted into the insertion receptacles 35 and 37, the front side 15 is subsequently directly contacted by the contact elements 23, 24, in particular the strip-shaped contact surfaces 25 and 26.During the further insertion process, these contact elements 23 and 24, in particular the contact surfaces 25 and 26 lying directly on the front side 13, move in the lying state relative to this front side 15 and in particular relative to the mirror 13. Due to the angled orientation or the oblique orientation of the contact surfaces 25 and 26 to the linear joining direction P, as can also be seen in . Fig. 7 As shown again, a force is exerted by the contact elements 23 and 24, in particular the contact surfaces 25 and 26, on the first mirror 13. As a result of this force, the first mirror 13 is then moved towards the support surfaces 27 and 28, and in the process the compression elements 18 and 19 are compressed. The relevant force is generated due to the oblique orientation of the contact surfaces 25 and 26 at an angle other than 0° and other than 180° to the joining direction P. Due to this linear or essentially linear joining direction P, the first mirror 13 is also moved, in particular, linearly or essentially linearly, in the direction of these support surfaces 27 and 28, by a force oriented at an angle thereto.

[0049] In Fig. 8 A perspective sectional view of the assembled final state between the base module 6 and the cover module 3 is shown. The fully assembled final state is shown. In this context, it can also be seen that an insertion element 34 is inserted into the insertion receptacle 35.

[0050] In this regard, Fig. 8 a side view of the arrangement according to Fig. 7 , whereby here, too, only the lower section is shown, and the upper section of the floor module 6 is shown from the side. In this final assembled state, the first mirror 13 is arranged in its final assembly position. The compression elements 18 and 19 remain compressed after reaching the final assembly position. In this regard, the first mirror 13 is mechanically contacted with the strip-shaped support surfaces 27 and 28 by means of the compression elements 18 and 19.

[0051] The contact surfaces 25, 26 and the bar-shaped compression elements 18, 19 are oriented parallel to each other in pairs on the opposite sides 14, 15 of the first mirror 13. This creates a favorable force path from the contact elements 23, 24 to the support surfaces 27, 28.

Claims

1. Method for assembling a head-up display (1), comprising the following steps: - providing a first mirror (13) of the head-up display (1); - attaching a first, elastic compression element (18) to a first edge region (16) of a rear side (14) of the first mirror (13) and attaching a second, elastic compression element (19) to a second edge region (17) of the rear side (14) of the first mirror (13); - introducing the first mirror (13) with the compression elements (18, 19) arranged thereon into a cover module (3) of a housing (2) of the head-up display (1) and setting a preassembly position of the first mirror (13) in the cover module (3), in which the compression elements (18, 19) rest against supporting surfaces (27, 28) of the cover module (3); - attaching a base module (6) of the housing (2), which is separate from the cover module (3), to the cover module (3), wherein, as the base module (6) is connected to the cover module (3), a front side (15) of the first mirror (13) is contacted by contact elements (23, 24) of the base module (6), and, as the base module (6) continues to be joined to the cover module (3), the first mirror (13) is pressed into a final assembly position, wherein, for this purpose, the compression elements (18, 119) are compressed and the first mirror (13) is pressed against the supporting surfaces (27, 28) of the cover module (3).

2. Method according to Claim 1, wherein the first mirror (13) is set in the preassembly position in the cover module (3) and is arranged therein in an oblique setting, wherein the first mirror (13) is set up with a peripheral edge (29) on at least one support (30, 31) of the cover module (2).

3. Method according to Claim 1 or 2, wherein the compression elements (18, 19) are provided as elongate beams which extend over at least 60%, in particular at least 70%, of the length of the respective edge region (16, 17) of the rear side (14).

4. Method according to one of the preceding claims, wherein the compression elements (18, 19) are provided as foam strips.

5. Method according to one of the preceding claims, wherein, as the base module (6) is connected to the cover module (3), insertion elements (34, 36) of one module (3, 6) are first inserted into insertion receptacles (35, 37) of the other module (3, 5), wherein, as the insertion elements (34, 36) begin to interlock in the insertion receptacles (35, 37), the contact elements (23, 24) are still arranged at a distance from the front side (15) of the first mirror (13).

6. Method according to Claim 5, wherein, as the insertion process of the insertion elements (34, 36) into the insertion receptacles (35, 37) continues, the front side (15) of the first mirror (13) is furthermore contacted directly by the contact elements (23, 24) and, as the insertion process then continues further, the compression elements (18, 19) are compressed and the first mirror (13) is pressed in the direction of the supporting surfaces (27, 28).

7. Method according to Claim 6, wherein, as the insertion process continues, the contact elements (23, 24), which rest against the front side (15), are moved relative to the front side (15), and this relative movement generates a force on the first mirror (13) which presses the first mirror (13) in the direction of the supporting surfaces (27, 28).

8. Method according to Claim 7, wherein the oblique orientation of the contact elements (23, 24) results in the direction of the force being generated at an angle not equal to 0° and not equal to 180° to the joining direction (P) in which the base module (6) is joined to the cover module (3).

9. Method according to one of the preceding claims, wherein the base module (6) is connected to the cover module (3) by a linear joining movement in the joining direction (P).

10. Method according to one of the preceding claims, wherein the base module (6) is provided with an integral outer housing (7), and the contact elements (23, 24) are formed integrally on the outer housing (7).

11. Method according to one of the preceding claims, wherein the base module (6) is provided with an outer housing (7), and a component (9) separate therefrom for producing an optical chamber (12) in the head-up display (1) is installed in the outer housing (7), and / or a second mirror (20) of the head-up display (1) is installed in the outer housing (7), wherein the base module (6) preassembled in this way is connected to the cover module (3).

12. Method according to Claim 11, wherein the component (9) is provided with the contact elements (23, 24) formed integrally thereon.

13. Head-up display (1) for a motor vehicle, having a housing (2) which has a cover module (3) and a base module (6), wherein a first mirror (13), by means of which light from an image generation unit (5) of the head-up display (1) is deflected, is arranged in the housing (2), characterized in that elastic compression elements (18, 19), which, in the assembled final state, rest against supporting surfaces (27, 28) of the cover module (3), are arranged on edge regions (16, 17) of a rear side (14) of the first mirror (13), wherein the base module (6) has contact elements (23, 24), which rest against a front side (15), provided for reflection, of the first mirror (13), such that the first mirror (13) is subjected to a force in the direction of the supporting surfaces (27, 28), and, as a result, the compression elements (18, 19) are compressed in the assembled final state of the first mirror (13), and the first mirror (13) is pressed against the supporting surfaces (27, 28).

14. Head-up display (1) according to Claim 13, characterized in that the contact elements (23, 24) have strip-shaped and obliquely oriented contact surfaces (25, 26) which rest directly against edge regions (15a, 15b) of the front side (15), which lie opposite the edge regions (16, 17) of the rear side (14).

15. Head-up display (1) according to Claim 14, characterized in that the contact surfaces (25, 26) and the beam-shaped compression elements (18, 19) are oriented parallel to one another in pairs on the opposite sides (14, 15) of the first mirror (13).