Thin plate structure, method for manufacturing thin plate structure, and cover assembly having thin plate structure

Abstract

The present invention relates to a lamina configuration (250) for a cover assembly, in particular for a head-up display, and to a method for manufacturing such a lamina configuration (250). The present invention also relates to a cover assembly and a head-up display having such a lamina configuration (250), in particular a head-up display for a means of transportation, having such a cover assembly. The lamina configuration (250) includes a first toothed rack (251) having a plurality of teeth (252) and a first toothed cover strip (253) arranged on the first toothed rack (251) and having a plurality of teeth (252). The lamina configuration (250) also includes a second toothed rack (254) having a plurality of teeth (252) and a second toothed cover strip (255) arranged on the second toothed rack (254) and having a plurality of teeth (252). A plurality of laths (256) are secured between the teeth (252) of the toothed racks (251, 254) and the toothed cover strips (253, 255).

Description

[Technical field]

[0001] The present invention relates to a sheet metal structure, in particular for a cover assembly for a head-up display, and to a method for manufacturing such a sheet metal structure.The present invention also relates to a cover assembly and a head-up display having such a sheet metal structure, in particular a head-up display for a means of transportation having such a cover assembly. [Background technology]

[0002] Head-up displays, also called HUDs, are understood to mean display systems in which the content presented is superimposed on the viewer's field of vision, allowing the viewer to maintain a certain direction of gaze. Due to their complexity and cost, such systems were initially used mainly in the aviation sector, but are now also used in mass production in the automotive sector.

[0003] A head-up display generally consists of an image generator, an optical unit and a mirror unit. The image generator generates an image. The optical unit directs the image onto the mirror unit. The image generator is often also called an imaging unit or PGU (picture generation unit). The mirror unit is a partially reflective light-transmitting mirror plate. The observer therefore sees the content represented by the image generator as a virtual image and at the same time sees the real world behind the mirror plate. In the automotive field, the windshield is often used as the mirror unit, and the curved shape of the windshield must be taken into account in the representation. Due to the interaction of the optical unit and the mirror unit, the virtual image is a magnified representation of the image generated by the image generator.

[0004] The observer can only see the virtual image from the position of the so-called eyebox. The eyebox refers to an area whose height and width correspond to a theoretical viewing window. As long as one of the observer's eyes is inside the eyebox, the eye sees all the elements of the virtual image. On the other hand, if the eye is outside the eyebox, the observer sees only a part of the virtual image or not at all. Therefore, the larger the eyebox, the less restrictions the observer has when choosing a seating position.

[0005] The size of the virtual image of a conventional head-up display is limited by the size of the optical unit. One approach to enlarge the virtual image is to couple the light coming from the image generating unit into a light guide. The light coupled into the light guide and carrying the image information is totally internally reflected at the boundaries of the light guide and is thus guided into the light guide. In addition, a part of the light is in each case outcoupled at multiple positions along the propagation direction, so that the image information is emitted to be distributed on the surface of the light guide. The light guide thus enlarges the exit pupil. Here, the effective exit pupil is composed of the image of the aperture of the image generating system.

[0006] Against this background, US Patent Application Publication No. 2016 / 0124223 describes a display device for virtual images. The display device includes a light guide that repeatedly causes light emitted from an image generating unit and incident through a first light input surface to undergo total internal reflection so as to move away from the first light input surface in a first direction. The light guide also has the effect that a portion of the light guided in the light guide exits to the outside through an area of ​​the first light output surface that expands in the first direction. The display device further includes a first light input side diffraction grating that diffracts the incident light so that the diffracted light enters the light guide, and a first light output diffraction grating that diffracts the light incident from the light guide.

[0007] In currently known designs of such head-up displays, in which the light guide consists of a glass plate in which a diffraction grating or hologram is arranged, problems arise in the presence of solar radiation. The incoming sunlight is refracted multiple times in the light guide and is decomposed into spectral colors. These leave the light guide again in many positions and are refracted in particular towards the eye. This leads to a loss of quality, such as a rainbow or reduced contrast. As a result, the actual image is only perceived as an even weaker image. Similar problems occur with the reflection of direct light on the light guide or on the cover of the optical unit, but also with other stray light sources. Even in conventional head-up displays without a light guide, the reflection of light due to sunlight or ambient light has a destructive effect.

[0008] Therefore, in conventional instruments, components where reflections may occur are tilted and combined with beam traps to prevent reflections from reaching the area where the driver's eyes are expected to be. Alternatively, anti-reflective coatings are employed and structural roughness is used to reduce the strength of reflections.

[0009] Tilting the components takes up significant installation space, which is limited within the vehicle. Furthermore, the performance of the components is generally degraded due to the tilted installation. Although the layers and structures reduce the achievable intensity, the reflections generally remain clearly visible and significantly reduce the contrast.

[0010] To reduce reflections, the head-up display can alternatively be provided with a cover assembly, which has a lamella structure or a grid with multiple lamellae to reduce reflections. The lamellae can substantially block incoming stray light.

[0011] In this context, DE 10 2014 214 510 A1 describes an arrangement for reducing reflections for a windshield display device for a motor vehicle, which comprises a transparent cover plate for protecting the projection device and a shielding grid with flat grid elements of a grid structure arranged perpendicularly or inclined with respect to the surface of the cover plate.

[0012] To further improve stray light suppression, adjustable lamellae can be used instead of a rigid lamella arrangement, with the actuation angle of the lamellae being adjusted based on the observer's head position.

[0013] For example, DE 102017219069 A1 describes a cover assembly for reducing reflections on a field display device for a motor vehicle. The cover assembly comprises a transparent cover plate for protecting the projection unit of the field display device and a dynamic shielding structure comprising a plurality of flat lamellae distributed along the surface of the cover plate. The inclination angle of the lamellae relative to the surface normal of the cover plate can be dynamically adjusted.

[0014] However, the manufacture of such sheet constructions entails considerable complexity, especially when the sheets are to be very thin. Typical material thicknesses of sheets range from 20 μm to 30 μm depending on the material. Summary of the Invention [Problem to be solved by the invention]

[0015] It is an object of the present invention to provide an improved solution for a lamination construction for a cover assembly for a head-up display. [Means for solving the problem]

[0016] This object is achieved by a sheet metal construction having the features of claim 1 and a method for producing such a sheet metal construction according to claim 5. Preferred embodiments of the invention are the subject matter of the dependent claims.

[0017] According to a first aspect of the present invention, the thin plate configuration comprises: a first rack having a plurality of teeth; a first cover rack strip disposed on the first rack and having a plurality of teeth; a second rack having a plurality of teeth; a second cover rack strip disposed on the second rack and having a plurality of teeth; - a number of laths fixed between the teeth of the rack and the cover rack strip; has.

[0018] In the lamella configuration according to the invention, the lamella is fixed at both sides at the end of the lamella between the rack and the associated cover rack strip, where the teeth of the rack or the teeth of the cover rack strip, respectively, determine the exact positioning of the lamella. The lamella preferably has a constant distance and a constant inclination angle over the entire length of the rack. However, it will be appreciated that both the distance and the inclination angle can also vary over the length of the rack, if necessary.

[0019] According to one aspect of the invention, the rack, the cover rack strip and the lamina are adhesively bonded together. In this way, the rack and the associated cover rack strip each form an adhesively bonded unit into which the ends of the lamina are recessed. This makes it easier to handle the lamina arrangement during subsequent assembly to the frame of the cover assembly.

[0020] According to one aspect of the invention, the first rack and the second rack have fastening elements for the support strips, which can then be assembled to the frame of the cover assembly, whereby the use of adapted support strips allows the sheet metal arrangement to be installed in different cover assemblies.

[0021] According to one aspect of the invention, the lamina is designed to be elastic. In this way, it is possible to adjust the inclination angle of the lamina after assembly in the cover assembly using appropriate actuation elements. In particular, the lamina can be made of plastic. The lamina is preferably made of polyimide.

[0022] According to a further aspect of the invention, a method for manufacturing a lamination structure according to the invention comprises the steps of: - fixing a first rack and a second rack on an inner subframe; - fastening a plurality of lamellas to a first auxiliary rack and a second auxiliary rack that are fixed to an outer subframe; - assembling a plurality of lamellas on a first rack and a second rack using an outer subframe; - securing a plurality of laminations in a first rack and a second rack using a first cover rack strip and a second cover rack strip; - separating the plurality of laminations from the first auxiliary rack and the second auxiliary rack; - removing the first rack and the second rack from the inner subframe; Includes.

[0023] In the method according to the invention for manufacturing a lamina arrangement, an auxiliary structure consisting of an outer subframe and an auxiliary rack fixed to the outer subframe is used to align the lamina in a defined position before assembly. The outer subframe is then placed relative to the inner subframe so that the lamina rests between the teeth of the rack. In that location the lamina can then be fixed using a cover rack strip and finally separated from the auxiliary rack. This has the advantage that the lamina is transferred uniformly to the rack. After removing the rack from the inner subframe the lamina arrangement can be further processed.

[0024] According to one aspect of the invention, the rack, the cover rack strip and the lamina are adhesively bonded together. In this way, the rack and the associated cover rack strip each form an adhesively bonded unit into which the ends of the lamina are recessed. This makes it easier to handle the lamina arrangement during subsequent assembly to the frame of the cover assembly.

[0025] According to one aspect of the invention, the lamina are tensioned with a defined weight before being secured to the auxiliary rack, thus ensuring that when all lamina are secured to the auxiliary rack and subsequently secured between the rack and the cover rack strip, all lamina are preloaded with exactly the same force, thus ensuring that a defined force is required to adjust the lamina inclination after the lamina configuration is assembled to the frame of the cover assembly.

[0026] According to one aspect of the invention, the lamina are adhesively bonded to the auxiliary rack, which ensures that the lamina maintains a defined configuration and is preloaded when assembled into the rack.

[0027] Preferably, a cover assembly, in particular a cover assembly for a head-up display, has the sheet metal arrangement according to the invention. Such a cover assembly is preferably used in a head-up display for means of transport, for example a head-up display for a car. However, the sheet metal arrangement according to the invention can also be used in other fields of application where glare avoidance is desirable, for example in defense applications, for example for glare avoidance in rifle scopes or for glare avoidance in cameras and surveillance cameras. Furthermore, the solution according to the invention can also be used as a privacy screen for displays, i.e. as a privacy filter or as a privacy screen for windows / dome-like light windows.

[0028] Further features of the present invention will become apparent from the following description and appended claims, taken in conjunction with the drawings. [Brief description of the drawings]

[0029] [Figure 1] 1 shows a schematic diagram of a prior art head-up display for a motor vehicle; [Diagram 2] A two-dimensionally expanded optical waveguide is shown. [Diagram 3] 1 illustrates a schematic diagram of a head-up display with a light guide. [Figure 4] 1 shows a schematic diagram of a head-up display with a light guide in a motor vehicle. [Diagram 5] 13A-13C are schematic diagrams illustrating the operation of a cover assembly having a lamella; [Figure 6] 1 shows an enlarged fragment of the cover assembly. [Figure 7] 1 shows a perspective view of a laminar configuration according to the present invention; [Figure 8] FIG. 2 shows a side view of a laminar arrangement according to the present invention. [Figure 9] 1 shows a schematic representation of a method for manufacturing a sheet metal construction according to the invention; [Figure 10] 13 illustrates the use of a subframe in making a lamination arrangement according to the present invention. [Figure 11] 1 shows the completed lamination configuration prior to release from the inner subframe. [Figure 12] 8 shows the lamination configuration of FIG. 7 assembled into a cover assembly. [Figure 13] 13 shows a cross section through the cover assembly of FIG. 12. [Figure 14] 13 illustrates the operation of an adjustment element for the lamellae of a lamella arrangement; [Figure 15] 1 shows multiple actuators grouped by a common sprue. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0030] In order to better understand the principles of the present invention, the embodiments of the present invention are described in more detail below with the aid of the drawings. The same reference signs are used for identical or functionally equivalent elements in the figures and are not necessarily described again for each figure. It goes without saying that the present invention is not limited to the illustrated embodiments, and the described features can also be combined or modified without departing from the scope of protection of the present invention as defined in the appended claims.

[0031] First, the basic concept of a head-up display having an optical waveguide will be described with reference to FIGS. 1 to 4. FIG.

[0032] Fig. 1 shows a schematic diagram of a conventional head-up display for a motor vehicle. The head-up display comprises a display device 1 with an imaging unit 10 and an optical unit 14. A beam SB1 emerges from a display element 11 and is reflected by a folding mirror 21 onto a curved mirror 22, which reflects said beam SB1 towards a mirror unit 2. The mirror unit 2 is here illustrated as a windshield 20 of the motor vehicle. From there, the beam SB2 travels towards the eye of an observer 3.

[0033] The observer 3 sees a virtual image VB located outside the vehicle, on the engine hood or even in front of the vehicle. Due to the interaction of the optical unit 14 with the mirror unit 2, the virtual image VB is an enlarged representation of the image displayed by the display element 11. Here, the speed limit, the current vehicle speed and the navigation instructions are symbolically represented. As long as the eyes of the observer 3 are located within an eyebox 4, indicated by a rectangle, all elements of the virtual image VB are visible to the observer 3. If the eyes of the observer 3 are located outside the eyebox 4, the observer 3 sees only a part of the virtual image VB or does not see it at all. The larger the eyebox 4, the less restrictions the observer has when choosing a seating position.

[0034] The curvature of the curved mirror 22 is adapted to the curvature of the windshield 20, ensuring that the image distortion is invariant throughout the eyebox 4. The curved mirror 22 is rotatably mounted by means of bearings 221. The rotation of the curved mirror 22, which this allows, allows the eyebox 4 to be shifted and thus its position to be adapted to that of the observer 3. The folding mirror 21 serves to ensure that the path travelled by the beam SB1 between the display element 11 and the curved mirror 22 is long while the optical unit 14 is nevertheless compact. The imaging unit 10 and the optical unit 14 are isolated from the environment by a housing 15 with a transparent cover plate 23. Thus, the optical elements of the optical unit 14 are protected, for example, from dust inside the vehicle. An optical film or polarizer 24 may further be located on the cover plate 23. The display element 11 is typically deflected in orientation and the mirror unit 2 acts like an analyzer. The purpose of the polarizer 24 is therefore to influence the polarization in order to achieve a uniform visibility of the useful light. The cover assembly 25 arranged on the cover plate 23 serves to ensure that the light reflected by the boundaries of the cover plate 23 is absorbed so that the observer is not dazzled. In addition to the sunlight SL, light from other stray light sources 5 may also reach the display element 11. In combination with the polarizing filter, a polarizer 24 may additionally be used to reduce the incoming sunlight SL.

[0035] FIG. 2 shows a schematic spatial view of a two-dimensionally expanded light guide 6. In the lower left region, an input coupling hologram 63 is evident, in which light L1 coming from an imaging unit (not shown) is coupled into the light guide 6. The light propagates therein to the upper right in the drawing according to the arrow L2. In this region of the light guide 6, there is a folding hologram 61, which acts like many partially transmitting mirrors arranged before and after each other and generates a light beam that is widened in the Y direction and propagates in the X direction. The light beam is indicated by three arrows L3. In the part of the light guide 6 extending to the right in the drawing, there is an output coupling hologram 62, which also acts like many partially transmitting mirrors arranged before and after each other and outcouples light, indicated by arrow L4, from the light guide 6 upwards in the Z direction. This output coupling hologram 62 expands in the X direction, as a result of which the original incoming light beam L1 leaves the light guide 6 in the light direction Lα as a two-dimensionally expanded light beam L4.

[0036] FIG. 3 shows a spatial view of a head-up display with three light guides 6R, 6G, 6B arranged one above the other and representing the primary colors red, green and blue, respectively. Together they form the light guide 6. The holograms 61, 62, 63 present in the light guide 6 are wavelength-dependent, whereby in each case one light guide 6R, 6G, 6B is used for one of the primary colors. The imaging unit 10 and the optical unit 14 are shown diagrammatically above the light guide 6. The optical unit 14 comprises a mirror 16, which deflects the light generated by the imaging unit 10 and shaped by the optical unit 14 in the direction of the respective coupling hologram 63. The imaging unit 10 comprises three light sources 17R, 17G, 17B for the three primary colors. It is clear that the entire unit shown has a small overall construction height compared to its light-emitting surface.

[0037] FIG. 4 shows a head-up display in a car similar to FIG. 1, now in a spatial view with a light guide 6. A schematic imaging unit 10 is evident, which generates a parallel beam SB1, which is coupled to the light guide 6 using a mirror plane 623. For simplicity, the optical unit is not shown. A number of mirror planes 622 reflect a part of the light incident thereon towards the windshield 20, the mirror unit 2, respectively. From here the light is reflected towards the observer 3. The observer 3 sees a virtual image VB at a further distance above the hood or in front of the car. In this technology too the whole optical system is built into a housing separated from the surroundings by a transparent cover and has a cover assembly to prevent stray light.

[0038] FIG. 5 shows the operation of the cover assembly 25 with the adjustable lamella 256 in a schematic way. In this example, a cross section through the cover assembly 25 is shown, which is integrated in the housing 15 together with the cover plate 23 and arranged above the light guide 6. The imaging unit 10 couples the light beam L1 into the light guide 6. At the upper boundary surface 601 of the light guide 6, an increased light flux L4 exits with a main direction angle α. The light direction Lα determined by the main direction angle α deviates from the normal direction N of the light guide 6 or the housing 15, respectively. The light flux L4 is reflected by the windscreen 20, which acts as a mirror unit 2, and reaches the eye of the observer 3, so that the observer 3 sees a virtual image VB. For space reasons, this virtual image VB is shown here biased close to the windscreen 20. The cover assembly 25 includes a lamella arrangement 250 with a number of inclined lamellae 256 that are aligned according to the light direction Lα, i.e. the inclination angle β of the lamellae is adapted to the light direction Lα. The inclination angle β can be adjusted using an adjustment element (not shown). To track the position of the observer 3, an eye tracking system 26 can be used.

[0039] Figure 6 shows an enlarged cross section of the cover assembly 25 of Figure 5. Sunlight SL incident from outside can be considered as stray light. This stray light can essentially only occur at the same angle at which the lamella 256 is also tilted. Therefore, the stray light is absorbed by the lamella 256 after being reflected by the cover plate 23.

[0040] 7 and 8 show a perspective view and a side view of a lamina arrangement 250 according to the present invention. The lamina arrangement 250 comprises a first rack 251 having a plurality of teeth 252 and a first cover rack strip 253 having a plurality of teeth 252 arranged on the first rack 251. The lamina arrangement 250 also comprises a second rack 254 having a plurality of teeth 252 and a second cover rack strip 255 having a plurality of teeth 252 arranged on the second rack 254. A plurality of lamina 256 is fixed between the teeth 252 of the racks 251, 254 and the cover rack strips 253, 255. In particular, the racks 251, 254, the cover rack strips 253, 255 and the lamina 256 can be adhesively bonded to each other to form a first end piece 258 and a second end piece 259. Preferably, the lamina 256 is formed by a plastic film, for example a polyimide film. For fixing the support strips for assembly to the cover assembly, the first rack 251 and the second rack 254 may have fixed portions 257. In the example shown, the lamella 256 has a constant distance d and a constant inclination angle β over the entire length of the rack 251. However, it will be appreciated that both the distance d and the inclination angle β can vary over the length of the rack 251, if desired.

[0041] FIG. 9 shows a schematic diagram of a method for manufacturing a lamina arrangement according to the invention. First, a first rack and a second rack are fixed to the inner subframe S1. Then, a number of lamina are fixed to a first auxiliary rack and a second auxiliary rack S2. The two auxiliary racks are fixed to the outer subframe. Before being fixed to the auxiliary racks, the lamina is preferably tensioned with a defined weight and then adhesively bonded to the auxiliary racks. Then, the lamina is inserted into the first and second racks S3 using the outer subframe. Then, the lamina is fixed in the racks S4 using a first cover rack strip and a second cover rack strip. The rack, cover rack strip and lamina are preferably adhesively bonded to each other for this purpose. Afterwards, the lamina is separated from the auxiliary rack S5. Finally, the rack is removed from the inner subframe S6.

[0042] FIG. 10 shows the use of the subframes 30, 31 in making a lamina arrangement 250 according to the invention. Two auxiliary racks 310, 311 are fixed to the outer subframe 31. A lamina 256 is then adhesively bonded to the outer subframe 31 on the auxiliary racks 310, 311 in tension. Two racks 251, 254 for receiving the lamina 256 are fixed to the inner subframe 30. The outer subframe 31 with the tensioned lamina 256 is then placed on the inner subframe 30 and the tensioned lamina 256 is transferred or adhesively bonded to the racks 251, 254. Afterwards, the cover rack strips 253, 255 are placed on the racks 251, 254 and adhesively bonded to the racks 251, 254. The lamina is now sandwiched between the racks 251, 254 and the cover rack strips 253, 255.

[0043] 11 shows the completed lamina configuration 250 before it is removed from the inner subframe 30. After the lamina 256 is secured between the racks 251, 254 and the cover rack strips 253, 255, the lamina 256 is separated. Now the lamina 256 is evenly transferred to the racks 251, 254. Finally, the racks 251, 254 only need to be removed from the inner subframe 30.

[0044] FIG. 12 shows the laminar arrangement 250 of FIG. 7 assembled in a cover assembly 25. The cover assembly 25 has a frame 300 to which two end pieces 258, 259 can be fixed. In the example shown, the first end piece 258 is fixed to the frame 300 by means of a first support strip 331, for example by gluing or screwing, and thus forms a fixed bearing for the laminar 256. As an alternative, the first support strip 331 can be omitted. The first end piece 258 can be fixed directly to the frame 300. The second end piece 259, in contrast, is fixed in a spring-loaded manner and forms a floating bearing for the laminar 256. For this purpose, the second end piece 259 is first screwed, pinned or adhesively bonded to the second support strip 32. The unit consisting of the second end piece 259 and the second support strip 32 is placed on the frame 300 and pressed down by a spring 33. In the example shown, two springs 33 are used, but a different number of springs 33 can also be used. Instead of the springs 33, other options for holding down can additionally be used, such as lateral guides for the second support strip 32 or movable fixing by means of slots in the second support strip 32. The lamella 256 is then tensioned by tension springs 34, which are fixed at fixing points 35 between the second support strip 32 and the frame 300. In the example shown, five tension springs 34 are used, but a different number of tension springs 34 can also be used. To adjust the inclination of the lamella 256, the cover assembly 25 has an adjustment element 36, which is actuated by a stepper motor 37.

[0045] FIG. 13 shows a cross section along the line AA through the cover assembly 25 of FIG. 12. The second support strip 332 is screwed to the second rack 254 by means of the screw 320. As described, the second rack 254 and the second cover rack strip 255 form a unit by gluing. In the illustrated embodiment, the second support strip 332 surrounds the second cover rack strip 255. For this purpose, the second support strip 332 has a bridge 321. The tension of the tension spring 34 is transferred to the rigid second support strip 332. On the one hand, the force is transferred to the second cover rack strip 255 by the connection and to the second rack 254 by the screw connection. This results in a central load on the glued part of the sandwich-like lamella 256. The spring pulls the center of the lamella 256. The resulting tension in the lamella 256 protects it from vibrations. Additionally, the spring-loaded fixation ensures compensation for temperature-related changes in the longitudinal expansion of the lamina 256 .

[0046] As can be easily seen in Fig. 13, the adjustment element 36 comprises a lower porous strip 360, an upper porous strip 361 and a number of actuators 362. Here, each lamella 256 is assigned an actuator 362 of the adjustment element 36. The actuators 362 each have a body 3620 as well as a lower protrusion 3621 and an upper protrusion 3622. The lower protrusion 3621 engages in an assigned notch 3600 in the lower porous strip 360, and the upper protrusion 3622 engages in an assigned notch 3610 in the upper porous strip 361. The notches 3600, 3610 of the porous strips 360, 361 preferably have a rectangular design. The rectangular design, in conjunction with the generally rectangular cross-section of the lower protrusions 3621 and upper protrusions 3622, ensures that the actuator 362 has a defined orientation relative to the porous strips 360,361 and that twisting of the actuator 362 relative to the porous strips 360,361 does not occur.

[0047] One of the first assembly steps of the cover assembly 25 consists in the lower porous strip 360 being rigidly connected to the frame 300. The lamination arrangement 250 is then arranged and the laminations 256 are tensioned as described above. The actuators 362 are now arranged between the tensioned laminations 256 such that their lower projections 3621 engage in each case in the associated notches 3600 of the lower porous strip 360. For this purpose it is advantageous if a group of actuators 362 or even all actuators 362 are grouped by a common sprue. The sprue can for example be arranged transversely at the upper end of the body 3620. The upper porous strip 361 is then arranged such that the upper projections 3622 of the actuators 362 engage respectively in the associated notches 3610 of the upper porous strip 361. Finally the actuators 362 are separated by breaking off the sprue. The lower porous strip 360 is preferably arranged on the frame 300 in such a way that after assembly, the lamina 256 each rest on one side of the body 3620. By resting the lamina 256 on the body 3620, it is possible to influence the shape of the lamina 256 precisely in the transverse direction. If the body 3620 is designed to be flat in the area where the associated lamina 256 rests, the lamina 256 also has a flat surface.

[0048] FIG. 14 visualizes the operation of the adjustment element 36 for the lamellae of the lamellae arrangement. The lower perforated strip 360 is rigidly arranged on the frame 300. To adjust the inclination, the upper perforated strip 361 is moved horizontally in the longitudinal direction by a stepping motor, parallel to the lower perforated strip 360. These displacements are indicated by double arrows in FIG. 14. As a result of the displacement, all the actuators 362 are tilted simultaneously. The lamellae are adjusted according to the inclination of the actuators 362, since they are elastic. The body 3620 of the actuator 362 preferably has a convex shape. For this purpose, the side of the body 3620 facing away from the respective lamellae can preferably be designed to be curved. Due to the curvature, the body 3620 can roll on the surface of the lower perforated strip 360 during adjustment, which ensures a smooth adjustment. The actuators 362 or the body 3620 of the actuator 362 are also designed so that the lamellae can slide on the actuators 362. In this way, the possibility of relative movement between the actuator 362 and the lamina is ensured such that damage to the lamina is prevented, even over long periods of time.

[0049] 15 shows multiple actuators 362 grouped together by a common sprue 3623 between a lower porous strip 360 and an upper porous strip 361 for easy assembly. The sprue 3623 is located laterally at the top end of the body 3620 such that the remainder of the sprue 3623 does not touch the sheet metal after the sprue 3623 is broken off. This ensures that the sheet metal is not damaged. [Explanation of symbols]

[0050] 1 Display device 2 Mirror unit 3. Observer 4. Eye Box 5 Stray light source 6, 6R, 6G, 6B optical waveguide 601 Upper boundary surface 61 Folded Hologram 62 Output Coupling Hologram 622 Mirror Plane 623 Mirror Plane 63 Input coupling hologram 10 Imaging unit 11 Display Elements 14 Optical unit 15 Housing 16. Mirror 17R, 17G, 17B light source 20 Windshield 21 Folding Mirror 22 Curved Mirror 221 Mounting part 23 Cover plate 24 Optical Films / Polarizers 25 Cover Assembly 250 thin plate configuration 251 First Rack 252 teeth 253 First Cover Rack Strip 254 Second Rack 255 Second Cover Rack Strip 256 thin plate 257 Fixed part 258 First end piece 259 Second end piece 26 Eye Tracking System 30 Inner subframe 300 frames 31 Outer subframe 310 1st Auxiliary Rack 311 Second Auxiliary Rack 320 Screw 321 Crosslinked part 33 Spring 331 First Support Strip 332 Second Support Strip 34 Tension spring 35 fixed point 36 Adjustment factors 360 Lower Perforated Strip 3600 Notch 361 Upper Perforated Strip 3610 Cutout 362 Actuator 3620 Main Unit 3621 Lower protrusion 3622 Upper projection 3623 sprue 37 Stepping motor α Principal direction angle β Tilt angle d Distance L1...L4 light Lα Light direction N Normal SB1, SB2 Beam SL Nikko VB Virtual Image S1 Fix the rack to the inner subframe S2 Fix the thin plate to the auxiliary rack on the outer subframe Installing thin plates in the S3 rack Fixing the thin plate in the S4 rack S5 Separating the thin plate from the auxiliary rack Remove the rack from the S6 inner subframe

Claims

1. A laminar structure (250), a first rack (251) having a number of teeth (252); - a first cover rack strip (253) arranged on said first rack (251) and having a number of teeth (252); a second rack (254) having a number of teeth (252); - a second cover rack strip (255) arranged on said second rack (254) and having a plurality of teeth (252); - a number of laths (256) fixed between the teeth (252) of the racks (251, 254) and the cover rack strips (253, 255); A thin plate arrangement (250) having:

2. 2. The lamination arrangement (250) of claim 1, wherein the racks (251, 254), the cover rack strips (253, 255) and the laminations (256) are adhesively bonded to one another.

3. 3. The sheet metal arrangement (250) according to claim 1 or 2, wherein the first rack (251) and the second rack (254) have fixing portions (257) for supporting strips.

4. The lamina configuration (250) of claim 1, wherein the lamina (256) is designed to be resilient.

5. 2. A method for manufacturing a lamination structure (250) according to claim 1, comprising the steps of: - fixing (S1) a first rack (251) and a second rack (254) on the inner subframe (30); - a step (S2) of fixing a number of lamellae (256) to a first auxiliary rack (310) and a second auxiliary rack (311) fixed to the outer sub-frame (31); - a step (S3) of assembling said plurality of laminae (256) on said first rack (251) and said second rack (254) using said outer subframe (31); - fixing (S4) said plurality of laminae (256) in said first rack (251) and said second rack (254) using a first cover rack strip (253) and a second cover rack strip (255); - separating (S5) the plurality of laminae (256) from the first auxiliary rack (310) and from the second auxiliary rack (311); - removing (S6) the first rack (251) and the second rack (254) from the inner subframe (30); The method includes:

6. 6. The method of claim 5, wherein the racks (251, 254), the cover rack strips (253, 255) and the lamina (256) are adhesively bonded to one another.

7. 7. The method according to claim 5 or 6, wherein the lamella (256) is tensioned with a defined weight before being fixed (S2) to the auxiliary rack (310, 311).

8. The method of claim 5, wherein the thin plate (256) is adhesively bonded to the auxiliary rack (310, 311).

9. A cover assembly (25) having the lamination construction (250) of claim 1.

10. A head-up display for a vehicle, comprising a cover assembly (25) according to claim 9.

Images