Method for producing a luminous 3D radar module cover and injection molding assembly

Abstract

Method for producing a luminous 3D radar module cover (50) which is intended for arrangement in the region of a radiator grille of a motor vehicle, comprising at least the following method steps: - producing a three-dimensional structure (2) with at least one light guide (4) from a light-scattering first plastic by means of a first injection molding tool (10); - metallization and mirroring of the three-dimensional structure (2) with subsequent separation of the sprue (16); - producing a cover element (42) which at least partially covers the metallized three-dimensional structure (2') in the position of use and on which the contour of the three-dimensional structure (2, 2') is recessed, from a second plastic by means of a second injection molding tool (20) with subsequent separation of the sprue (26); - Embedding the metallized three-dimensional structure (2') together with the cover element (42) arranged thereon in a third plastic by means of a third injection molding tool (30) while simultaneously forming a holder (52) for a radar module (60) and a plurality of fastening points (54) on the molded component (50).

Description

[0001] The invention relates to a method for producing an illuminating 3D radar module cover intended for placement in the area of a motor vehicle's radiator grille. Furthermore, the invention also relates to an injection molding system for producing illuminating 3D radar module covers.

[0002] 3D radar module covers for installation in a motor vehicle radiator grille currently involve many complex process steps and are therefore implemented rather hesitantly and seriously by only a few companies.

[0003] Their costly and time-consuming production is primarily due to the high requirements for the "transparency" of the cover for radar waves, which is essential for the functionality of, for example, an adaptive cruise control system. For example, DE 198 19 709 C2 and DE 103 38 506 B4 specify that no air may be trapped between the plastic layers. Furthermore, only metallic layers made of indium, tin, or gold are permitted to avoid obstructing the radar waves.

[0004] Looking at current production covers, you'll notice that the 3D structure is created in an injection-molded plastic disc made of a radar-transparent thermoplastic, such as polycarbonate (PC). Without an additional cross-linked coating, this would quickly become scratched by stone impacts. Therefore, the very thin polyurethane layer is applied in an additional process step, as with headlight covers.

[0005] For an additional charge, vehicle logos, for example, are also available with backlighting to illuminate the central component from the side. However, this option requires the integration of electronic components and circuit paths in the area, which would interfere with the radar module's functionality. Therefore, versions with an illuminated logo, for example, require the radar functionality to be omitted.

[0006] In the dark or when dirty, the trademarks with the radar module behind them may not be visible.

[0007] Fiber optic technology, for example, is used in vehicle headlights to couple light into a single location and guide it through a defined optical design. A corresponding technology can be found in DE 10 2008 048 765 A1. To mount the standard radar module, which is actually intended for the respective task on the vehicle, behind the cover, an additional plastic mount is installed to position the module stably and precisely. However, the dimensions of the thermoplastic mount can change due to temperature fluctuations or the influence of media.

[0008] Furthermore, DE 10 2006 046 436 B3 shows a cover element for an opening of a vehicle, which has an at least partially metallized film, which is over-molded on a front side with a layer of a first plastic and is back-molded on a rear side with a cover layer of a second plastic.

[0009] US 2011 / 0 047 784 A1 discloses a method for manufacturing a radome provided on a detection side of a radar for detecting an obstacle near a vehicle, comprising a first molding step of molding a transparent member having a recess on one surface thereof; a first installation step of installing, in the recess, a bright member having a shape corresponding to a space in the recess and whose contact surface, which comes into contact with an inner surface of the recess, has brilliance; and a second installation step of installing a base member covering the one surface and integrally holding the transparent member and the bright member.

[0010] Finally, JP 2003-202369 A shows a housing integrally attached to a back surface of an emblem E provided in the center of a front grille of a vehicle. The radar device is housed in the housing. The emblem E is formed of a synthetic resin. A design portion is metallized. Since the other bottom transmits a radar beam from the radar device, the power to detect the object functions freely. Since the emblem is integrated into the housing and the distance to the radar device is reduced, the emblem can be miniaturized, and the design constraints of the emblem can be reduced to a minimum.

[0011] It is therefore the object of the present invention to create a simpler and cost-effective production of optically high-quality radar module covers with reflective and luminous 3D structures that are clearly visible even when dirty or in the dark. These covers should be able to be manufactured in as few process steps as possible and still meet the radar sensor's high requirements regarding radar wave permeability. At the same time, the cover must be scratch-resistant and protect the glossy company logo against environmental influences at the central installation point of the radiator grille for as long as possible. In addition, a mechanically rigid and thermally stable mount should be integrated into the back of the cover or the 3D structure so that a standard radar module can be installed in a permanently precise position.

[0012] This object is achieved according to the invention by the features of independent claims 1 and 18. Accordingly, the solution consists in particular in a method of the type mentioned at the outset, in which - a three-dimensional structure with at least one light guide made of a light-scattering first plastic is produced by means of a first injection mold; - the three-dimensional structure is metallized and mirrored and then the sprue is separated; - a cover element is produced which at least partially covers the three-dimensional structure in the position of use and on which the contour of the three-dimensional structure is cut out, namely from a second plastic by means of a second injection moulding tool with subsequent separation of the sprue; - the metallized three-dimensional structure, together with the cover element arranged thereon, is embedded in a third plastic by means of a third injection molding tool, with simultaneous formation of a holder for a radar module and a plurality of fastening points on the molded component.

[0013] The invention is accordingly based in particular on the fact that, by means of the method in question, a radar module cover with a luminous 3D structure can be produced with high optical quality and at the same time cost-effectively in just a few process steps. Metallization also creates a mirror surface. The company logo depicted by the 3D structure, for example, is displayed luminously even in the dark and in the central radiator grille area, and does not impede the functioning of the radar module due to lateral light coupling. The three-dimensional structure can, for example, have a substantially flat design with elements protruding in the normal direction, so that a company logo, for example, is conceivable as a raised 3D structure.

[0014] It is also conceivable, for example, that the luminous cover, if directly connected to the radar module, could also display signals or operating states to the vehicle ahead. Since fewer manufacturing steps are required than, for example, in current series applications without lighting, sources of error such as air pockets or coating defects are eliminated.

[0015] By using cross-linking transparent plastic as a complete overmold, the outer surface is protected against environmental influences with a thermosetting protective layer and eliminates the need for a complex painting process.

[0016] Further advantageous variants of the method according to the invention can be found in the subclaims.

[0017] In an advantageous variant of the method according to the invention, a thermoplastic plastic, in particular a transparent thermoplastic plastic, can be used as the first plastic for producing the three-dimensional structure with the at least one light guide, so that it can be easily penetrated by light emitted by a light source.

[0018] In a further development, the light guide of the 3D structure can be manufactured in a separate injection molding process from a transparent polymethyl methacrylate (PMMA), a polycarbonate (PC), or a polysiloxane (silicone) plastic, each of which can be specifically adjusted or configured to diffuse light. The first plastic can therefore be Plexiglas, for example. The light can be introduced laterally via LEDs, for example, so that no electronic components or conductors are located in front of the radar module, thus advantageously ensuring low-interference or interference-free coupling.

[0019] For this purpose, in a particularly preferred further variant of the method, the three-dimensional structure with the at least one light guide can be provided and configured with at least one receptacle, on which, in the use position, at least one light source, preferably at least one LED, is arranged and connected to the light guide. This allows the 3D structure to be illuminated with minimal effort by the light guide formed therewith.

[0020] Another variant of the method according to the invention can be configured such that the three-dimensional structure is metallized with a metal permeable to radar waves, in particular with indium, tin, or gold, so that the applied layer of vaporized metal can be easily penetrated by radar waves. For this purpose, the 3D structure produced in the first manufacturing step was previously molded with very low roughness, so that it can now be fully metallized and mirrored in the present step.

[0021] To ensure the passage of light through the vapor-deposited layer in the three-dimensional structure, another advantageous variant of the process provides for a thickness between 20 and 50 nm, since a greater thickness no longer allows for light to pass through. The metal layer applied to the structure is thus so thin that it reflects forward while still allowing the light from the light guide to pass through.

[0022] A variant of the process offers good handling of the three-dimensional structure during the metallization step. In this variant, the three-dimensional structure is formed in the first injection mold as a molded part with a sprue, in particular a rod sprue, which serves as a holding means during metallization. After metallization is complete, the sprue can be mechanically separated from the molded part so that it no longer causes any disruption.

[0023] In a further advantageous variant of the method according to the invention, the cover element is molded, for example, as a cover plate with the correspondingly recessed contour of the three-dimensional structure with the light guide in a separate injection mold. Accordingly, the cover element is manufactured in the second injection mold from a thermoplastic material, in particular from an initially essentially transparent PMMA, or from a plastic with adjustable properties, a polymer blend. The sprue that is also created in this case can then be mechanically separated again.

[0024] In a preferred development, the polymer blend can be formed by a blend of a polycarbonate together with a thermoplastic terpolymer, in particular an acrylonitrile-butadiene-styrene copolymer (ABS) or together with a polyester, in particular with polybutylene terephthalate, wherein the first of the blends is easily coatable and has good resistance to weather conditions and aging, while the latter, for example, has in particular favorable cooling behavior.

[0025] In order to be able to represent structures with high contrast and, in particular, with different color components, one variant of the process advantageously involves coloring a melt of the starting material(s) used to produce the cover plate with at least one radar-transparent colorant, in particular with color pigments or colorants. Pigments used as the coloring substance are present undissolved in the melt and are preferably migration-stable, so that the color is permanently retained. Coloring is conceivable with a wide variety of color pigments, but also, if necessary, in combination with effect pigments (pearlescent, metallic effect, or similar).

[0026] In order to suitably enclose the package of cover element and three-dimensional structure on all sides in a kind of protective layer and simultaneously create an aging layer for a radar module with fastening means, the component resulting from the third injection molding process is expediently provided with undercuts. Therefore, a further variant of the method according to the invention provides for the provision and installation of at least one slider on the third injection mold during embedding with the third plastic. This can be a transverse slider; sliders generally generate additional demolding directions during molding.A thermoplastic polymer, particularly a layer or insert made of Teflon (PTFE), is advantageously arranged on the surface area facing the three-dimensional structure. Retaining and fixing holes are then machined into these holes, into which the metallized 3D structure with the light guide, combined with the cover element, is inserted. After the cross slide is retracted laterally and the injection mold is closed, the components for the third plastic are injected via the mixing head.

[0027] In a preferred variant of the method, with which a stable end product with a smooth surface is produced which makes an additional protective layer superfluous, the third plastic is formed by a cross-linking lacquer, in particular a transparent cross-linking lacquer, in which the three-dimensional structure and the cover element arranged on it are completely embedded.

[0028] For this purpose, in a preferred embodiment, the crosslinking coating is formed with a synthetic resin, in particular a transparent synthetic resin, for example, polyurethane, or an elastomer, for example, polyurea. Polyurethanes exhibit good electrical insulation and resistance to weathering, while varying both in terms of their crosslinking and their tightness. Polyurea is moisture-resistant and durable.

[0029] For the production of more reproducible, precise end products with identical shapes, an advantageous variant of the method according to the invention can consist in injecting the crosslinking lacquer into the third injection mold at an internal mold pressure of less than 50 bar, so that the injection mold and its clamping unit are subject to only minimal deformation and so-called mold breathing has no influence on the molding. In a similar context, to create a mechanically rigid and thermally stable mount for precise positioning of the radar module, which is evident in use by the generation of reliable measured values, the third plastic can be crosslinked at a mold temperature in a range between 70°C and 100°C.

[0030] After the component is manufactured, the radar module can be inserted into the created holder with the cap facing the overmolding and secured to the component module housing, for example, using two or more locking tabs, which also forms a type of module housing. The LEDs can then be secured laterally in the mounts, and the complete radome can be attached to the mounting points, such as screw points, in the radiator grille.

[0031] The above object is also achieved by an injection molding arrangement for producing luminous 3D radar module covers, with a metallization device, at least one sprue separating device and with a plurality of injection molds, wherein a first of the injection molds forms a three-dimensional structure with at least one light guide from a first light-scattering plastic, wherein a second of the injection molds forms a cover element from a second plastic which at least partially covers the three-dimensional structure in the position of use and on which the contour of the three-dimensional structure is cut out, and wherein a third of the injection molds embeds the three-dimensional structure, after its metallization by the metallization device, together with the cover element arranged thereon, in a third plastic and furthermore forms a holder for a radar module and a plurality of fastening points.

[0032] This arrangement is suitable and intended and configured to carry out, in particular, a method outlined above, so that reference can be made to the above explanations with regard to the functionalities of the individual components.

[0033] The invention is explained in more detail below with reference to exemplary embodiments in the drawing. In a partially schematic representation, Fig. 1a-c a sectioned side view ( Fig. 1a) of a first injection molding tool with a three-dimensional structure with a light guide therein, a plan view ( Fig. 1b) on the three-dimensional structure and a sectioned side view of the structure with light guide from the Fig. 1b Side view, produced according to a first variant of the method; Fig. 2a, legs cut side view ( Fig. 2a) of a second injection molding tool with a cover element located therein and a plan view ( Fig. 2b) on the cover element with a recessed contour of the three-dimensional structure, manufactured according to a further variant of the method; Fig. 3 a sectional side view of a third injection molding tool with cross slide and Teflon insert with a package of three-dimensional structure with light guide and cover element with recessed contour of the three-dimensional structure, manufactured according to a further variant of the method; Fig. 4a,b sectioned side view ( Fig. 4a) and flat side view ( Fig. 4b) the component produced from the manufacturing steps of the method with the radar module and light sources arranged thereon; Fig. 5 plan view of the component of the Fig. 4 with fastening points for fixing the component in the area of a radiator grille.

[0034] In all figures, identical or functionally identical elements and devices are provided with the same reference numerals unless otherwise indicated. Fig. 1-5, various sub-steps of the method according to the invention and the injection molding arrangement are illustrated in general terms using schematic diagrams. Firstly, in the Fig. 1a-c a representation of the method step of producing the three-dimensional structure 2 with at least one light guide 4 made of a light-scattering first plastic by means of a first injection molding tool 10. The Fig. 1a shows the three-dimensional structure 2 as a molded part of this process step in the injection mold 10, the structure 2 forms a disc-shaped contour, which in the Fig. 1b in the plan view and in the side view of the Fig. 1c. There, the structure 2 is visible as a transparent body, which has receptacles 6 for light sources 8 (not shown here) at two opposite ends. The first injection mold 10 shows the mold 12, which can be divided into a sprue side 12a and an ejection side 12b at the parting plane 14. Accordingly, in the illustration of the Fig. 1a shows a rod-shaped sprue 16. Furthermore, on the ejection side 12b, a plurality of ejectors 18 arranged one above the other and pointing in the direction of the sprue side can be seen, with the aid of which the three-dimensional structure 2, whose raised regions 3 are molded in mold cavities 15 on the sprue side, can be released from the ejection side 12b after the first injection molding process.

[0035] In a separate, second injection mold 20, shown in the Fig. 2a, the cover element 42 is manufactured, which later covers the three-dimensional structure 2 in the position of use at least partially. On the cover element 42, which is shown in the Fig. 2b in a top view, the contour of the three-dimensional structure 2 is cut out with the recess 44, the cover element 42 is produced from a second plastic by means of the second injection mold 20 with subsequent separation of the sprue 26. The parting plane 24, which separates the sprue side 22a and the ejection side 22b, can also be seen on the second injection mold 20. The Fig. 2a, the cover element 42 located in the casting mold 22 is essentially molded in a mold cavity 25 of the ejection side 22b, while projections 23 cut out the contour of the three-dimensional structure 2 for its coverage by the cover element 42. Again, ejectors 28 ensure that the cover element 42 can be released from the ejection side 22b of the casting mold 22. In addition, a strand-shaped sprue 26 can be seen again, along the extent of which the second plastic is injected into the casting mold 22. At overlap points 45, the cover element 42 covers the three-dimensional structure 2 or 2' in the Fig. 2 not shown position of use at least partially.

[0036] The Fig. 3 shows the third injection molding tool 30 for embedding the three-dimensional structure 2', which is now metallized after a metallization (not shown in detail), together with the cover element 42 arranged thereon in a lacquer layer 33 as a third plastic by means of a third injection molding tool 30, while simultaneously forming a holder 52 for a Fig. 3 not shown, standardized radar module 60 and a plurality of fastening points 54 on the molded component 50. It can be seen that the assembled package of metallized three-dimensional structure 2' and cover element 42 arranged thereon are completely embedded in a lacquer layer 33. It can also be seen that a mold cavity 35 in the sprue side 32a of the mold 32 of the third injection molding process receives the raised areas of the mentioned package. In contrast to the first two molds 12, 22, in that of the Fig. 3 the sprue 36 is parallel to the parting plane 34, and not transversely thereto. Away from the parting plane 34, a holder 52 is formed on the component 50 produced by the third injection molding process, which holder is used to receive a Fig. 3 not visible radar module 60. Since the holder 52 is provided with undercuts 53, which are used to arrange the respective Fig. 3, a locking groove 56 is formed on the casting mold 32, a cross slide 37 opening up a further demolding direction on the casting mold 32. The cross slide 37 is provided with a flat Teflon insert 39 on its surface facing the aforementioned package. Furthermore, ejectors 38 can again be seen on the ejection side 32b of the casting mold 32, which engage in the edge regions of the component 50 when the casting mold 32 is opened from the ejection side 32b in order to release the component from the casting mold 32.

[0037] In the Fig. 4a shows the finished component 50, i.e. the 3D radar module cover 50, in which component 50 the metallized three-dimensional structure 2' with light guide 4 with the cover element 42 is embedded in the lacquer layer 33, with the radar module 60 arranged thereon in a sectional side view, while the Fig. 4b shows the component 50 only in a side view. The latter view shows the radar module 60 with an additional protective closure cap 66, as well as with a light source connection 64, which connects the radar module 60 to an LED light source 8 arranged in the receptacle 6 of the three-dimensional structure 2'. In addition to the connection to the LED light source 8, Fig. 4a on the component 50 with the package of metallized three-dimensional structure 2' and cover element 42 in the embedding of the lacquer layer 33. Only in the sectional view of the Fig. 4a, the holder 52 forms undercuts 53, at the ends of which locking grooves 56 are arranged as a fastening element, into which locking lugs 62 protruding from the module housing 61 of the radar module 60 engage in the use position. The locking lugs 62 and the locking groove 56 together form a fastening means 63.

[0038] Finally, the Fig. 5 the complete component as a 3D radar module cover 50, the so-called radome, with a metallized three-dimensional structure 2' embedded in the paint layer 33 with a light guide 4 with a cover element 42 arranged thereon, wherein four holders 52 are arranged on the paint layer 33, evenly distributed on the circumference of the component 50, by means of which the component 50 can be arranged in the area of a radiator grille (not shown) of a motor vehicle.

[0039] Accordingly, the invention described above relates to a method and an arrangement suitable for carrying out the method, each for producing a luminous 3D radar module cover 50, which is intended for arrangement in the region of a radiator grille of a motor vehicle, wherein in separate method steps a three-dimensional structure 2 containing at least one light guide 4 is produced from a light-scattering first plastic by means of a first injection mold, the three-dimensional structure 2 is metallized and mirrored with subsequent separation of the sprue 16, a cover element 42 is produced from a second plastic by means of a second injection mold 20, which cover element at least partially covers the metallized three-dimensional structure in the position of use and on which the contour of the three-dimensional structure 2, 2' is recessed,with subsequent separation of the sprue 26 and the metallized three-dimensional structure 2' together with the cover element 42 arranged thereon is embedded in a third plastic by means of a third injection molding tool 30 with simultaneous formation of a holder 52 for a radar module 60 and a plurality of fastening points 54 on the molded component 50. List of reference symbols 2 three-dimensional structure 2' metallized three-dimensional structure 3 raised area of the three-dimensional structure 4 light guides 6 Recording of light source 8 Light source / LED 10 first injection mold 12 Casting mold 12a sprue side 12b Ejection side 14 Parting plane 15 mold cavity 16 sprue 18 ejectors 20 second injection mold 22 Casting mold 22a sprue side 22b Ejection side 23 lead 24 Parting level 25 mold cavity 26 sprue 30 third injection mold 32 mold 32a sprue side 32b Ejection side 33 coats of paint 34 Parting plane 35 mold cavity 36 sprue 37 cross slides 38 ejectors 39 Teflon insert 42 Cover element 44 recess 45 Cover point 50 component / 3D radar module cover 52 bracket 53 Undercut 54 Attachment point 56 locking groove 60 radar module 61 module housings 62 locking lug 64 light source connection 66 cap

Claims

[1] Method for producing a luminous 3D radar module cover (50) which is intended to be arranged in the region of a radiator grille of a motor vehicle, comprising at least the following method steps: - producing a three-dimensional structure (2) with at least one light guide (4) from a light-scattering first plastic by means of a first injection molding tool (10); - metallization and mirroring of the three-dimensional structure (2) with subsequent separation of the sprue (16); - producing a cover element (42) which at least partially covers the metallized three-dimensional structure (2') in the position of use and on which the contour of the three-dimensional structure (2, 2') is recessed, from a second plastic by means of a second injection molding tool (20) with subsequent separation of the sprue (26); - Embedding the metallized three-dimensional structure (2') together with the cover element (42) arranged thereon in a third plastic by means of a third injection molding tool (30) while simultaneously forming a holder (52) for a radar module (60) and a plurality of fastening points (54) on the molded component (50). [2] Method according to claim 1, wherein a thermoplastic plastic, in particular a transparent thermoplastic plastic, is used as the first plastic. [3] Method according to claim 2, wherein the thermoplastic material used is a polymethyl methacrylate (PMMA), a polycarbonate (PC) or a polysiloxane. [4] Method according to one of the preceding claims, wherein the three-dimensional structure (2) with the at least one light guide (4) is provided and arranged with at least one receptacle (6) on which, in the position of use, at least one light source (8), in particular at least one LED, is arranged and connected to the light guide (4). [5] Method according to one of the preceding claims, wherein the three-dimensional structure (2) is metallized with a metal permeable to radar waves, in particular with indium, tin or gold. [6] Method according to one of the preceding claims, wherein a layer of evaporated metal is applied to the three-dimensional structure (2), the thickness of which layer is between 20 and 50 nm. [7] Method according to one of the preceding claims, wherein in the first injection mold (10) the three-dimensional structure (2) is formed as a molded part with a sprue (10), in particular a rod sprue, which is used as a holding means during the metallization and is mechanically separated from the molded part after the completion of the metallization. [8] Method according to one of the preceding claims, wherein the cover element (42) is produced in the second injection mold (20) from a thermoplastic material, in particular from PMMA, or from a polymer blend. [9] Process according to claim 8, wherein the polymer blend is formed by a blend of a polycarbonate together with a thermoplastic terpolymer, in particular an acrylonitrile-butadiene-styrene copolymer (ABS) or together with a polyester, in particular with polybutylene terephthalate. [10] Method according to one of the preceding claims, wherein a melt of the plastic(s) used to produce the cover element (42) is colored with at least one radar-wave-permeable colorant, in particular with color pigments. [11] Method according to one of the preceding claims, wherein during the embedding with the third plastic on the third injection mold (30) at least one cross slide (37) is provided and arranged, on the surface area of which facing the metallized three-dimensional structure (2') a thermoplastic polymer, in particular a layer or an insert (39) made of Teflon (PTFE) is arranged. [12] Method according to one of the preceding claims, wherein the third plastic is formed by a cross-linking lacquer, in particular a transparent cross-linking lacquer layer (33), in which the metallized three-dimensional structure (2) and the cover element (42) arranged on it are completely embedded. [13] Method according to claim 12, wherein the crosslinking lacquer is formed by a synthetic resin, in particular a transparent synthetic resin, for example polyurethane, or an elastomer, for example polyurea. [14] Method according to claim 12 or 13, wherein the crosslinking lacquer is injected into the third injection mold (30) at an internal mold pressure of less than 50 bar. [15] Method according to one of the preceding claims, wherein the third plastic crosslinks at a tool temperature in a range between 70°C and 100°C. [16] Method according to one of the preceding claims, wherein during the embedding a holder (52) is formed, on which a radar module (60) is arranged and is detachably connected and held to the finished component (50) via a fastening means (63), in particular a snap-in connection. [17] Method according to one of the preceding claims, wherein the created component (50) is fixed after arrangement of the radar module (60) and the at least one light source (8) at fastening points (54) provided on the component (50) in the region of the radiator grille. [18] Injection-molding arrangement for producing luminous 3D radar module covers (50), in particular for carrying out a method according to one of the preceding claims, with a metallization device, at least one sprue separating device and with a plurality of injection molds (10, 20, 30), wherein a first of the injection molds (10) forms a three-dimensional structure (2) with at least one light guide (4) from a first light-scattering plastic, wherein a second of the injection molds (20) forms a cover element (42) from a second plastic, which at least partially covers the previously metallized three-dimensional structure (2) in the position of use and on which the contour of the three-dimensional structure (2) is recessed,and wherein a third of the injection molds (30) embeds the three-dimensional structure (2') after its metallization by the metallization device together with the cover element (42) arranged thereon in a third plastic and furthermore forms a holder (52) for a radar module (60) and a plurality of fastening points (54).

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