Radome for vehicles and method for manufacturing the radome

Abstract

To enhance the permeation performance of radar emitted waves and received waves in a radome.SOLUTION: A radome (1) for vehicles comprises a frontal transparent layer (5); a metal-looking decoration layer (7); a rear layer (10); an adhesion promoter layer (8) placed between the metal-looking decoration layer (7) and the rear layer (10); and a colored decoration layer (6) placed between the frontal transparent layer (5) and the metal-looking decoration layer (7). A method for manufacturing the radome comprises the steps of forming the layers, so that the adhesion promoter layer (8) is placed between the metal-looking decoration layer (7) and the rear layer (10), and the colored decoration layer (6) is placed between the frontal transparent layer (5) and the metal-looking decoration layer (7). It permits to provide a radome in which there is no air gap between its plastic molded parts, enhancing its performance to transmit the radar emitted and received waves.SELECTED DRAWING: Figure 3

Description

Detailed Description of the Invention

[0001] [explanation] The present invention refers to a radome for a vehicle and a method for manufacturing the same.

[0002] [Background of the invention] The continuous advancement of automotive technology aims to deliver Automated Driving Systems (ADS) within the next few years through increasingly higher levels of driver assistance as defined by the Society of Automotive Engineers (SAE). Radomes are a relevant part of these systems because they protect the radars used to detect obstacles in the vehicle's path. At the same time, radomes usually display the car manufacturer's emblem.

[0003] The radome, as seen by an outside observer, usually includes colored and metallic-like areas that combine to represent the manufacturer's emblem. The metallic appearance, which is compatible with the high level of penetration of signals emitted and received by the protected radar, is provided by some bright decorative layer carried by a plastic part.

[0004] The above-mentioned ever-increasing levels of driver assistance require increased radar performance. Therefore, radome transmission requirements are being tightened to maximize the benefits from radar improvements, maximizing transmission and minimizing reflection. Additionally, the automotive market is under constant price pressure, requiring simplified manufacturing costs to match the ever-increasing performance that must be achieved.

[0005] Most of today's high-quality radomes have a clear resin at the front to protect the inner decorative layer, which is primarily composed of a metallic appearance and colored decoration. Another resin layer at the rear acts as a substrate, completing the protection of the decorative layer and providing a means for fastening to other parts of the vehicle.

[0006] One of the identified factors that can degrade a radome's ability to transmit radar emitted and received waves is the presence of voids between the layers of the radome.

[0007] EP 3529857 A1, in the name of the same applicant as the present application, discloses a radome in which the front and rear parts are welded together even in the field of view, minimizing the gap between the substrates and keeping the gap as constant and small as possible. However, this results in a precise and complicated manufacturing process. In addition, depending on the water absorption properties of certain resin materials or the water resistance of the assembled radome, water may enter the gap.

[0008] US 7990334 B2 discloses a radome having a front part and a rear part with a plurality of engaging projections and recessed zones to improve the mechanical connection between both parts. However, this is only a mechanical joint, and here, due to the presence of a metal-like design layer, a good attachment between the front part and the rear part is not possible, because no welding is achieved between both parts.

[0009] CN 103367913 B discloses a radome in which the front part is decorated on its rear surface by magnetron sputtering, which must be protected with an organic paint coating that requires a long baking process at high temperature before the rear part is joined by means of adhesive or insert molding.

[0010] [Description of the Invention] Accordingly, one object of the present invention is to provide a vehicular radome and a method for manufacturing the vehicular radome, wherein there are no voids between the plastic molded parts of the radome, enhancing the radome's ability to transmit radar emitted and received waves.

[0011] The vehicle radome and method according to the present invention can overcome the above-mentioned drawbacks and provide other advantages as described below.

[0012] A radome for a vehicle and a method for manufacturing the same are set out in the corresponding independent claims. Further optional features are set out in the dependent claims.

[0013] The vehicle radome according to the present invention comprises: - a front transparent layer; a metallic decorative layer; - the posterior layer, an adhesion promoter layer disposed between the metallic decorative layer and the backing layer; a colored decorative layer disposed between the front transparent layer and the metallic decorative layer; Equipped with.

[0014] The adhesion promoter layer is in contact with the metallic decorative layer and, if no other layers are present between the adhesion promoter layer and the backing layer, the adhesion promoter layer is in contact with the backing layer.

[0015] Adhesion promoters are commercially available and are typically used when adhesives or tapes must be applied to low surface energy (LSE) plastics such as polypropylene (PP) or polyethylene (PE), or to powder-coated paints. Adhesion promoters usually contain a high percentage of organic solvents such as cyclohexane, xylene, ethylbenzene, ethyl alcohol, ethyl acetate, or toluene. Another family of adhesion promoters is designed to improve the adhesion of polyurethane-based adhesives or sealants to glass, plastics, painted surfaces, and metals. While adhesion promoters are widely used to improve the adhesion of adhesives or sealants to surfaces that are difficult to adhere to, in this application, adhesion promoters are used to improve the adhesion of plastic resins to be molded onto them.

[0016] Advantageously, the adhesion promoter layer has a viscosity of less than 30 mPa·s and a thickness of less than 20 μm.

[0017] The coloured decorative layer is preferably provided with uncoated areas.

[0018] Additionally, the vehicle radome according to the present invention may also include an ink layer applied over the adhesion promoter layer, the ink layer preferably being disposed between the adhesion promoter layer and the backing layer.

[0019] If the ink layer is present, the adhesion promoter layer is in contact with the ink layer and the metallic decorative layer.

[0020] According to one possible embodiment, the metal-like decorative layer, the adhesion promoter layer and / or, if present, the ink layer are provided with masking areas, and the masking areas of the metal-like decorative layer, the adhesion promoter layer and / or the ink layer are arranged in conformity with each other.

[0021] Advantageously, the metallic decorative layer is made of a metal, a metalloid and / or an oxide.

[0022] According to a second aspect, the present invention provides a method for manufacturing a vehicle radome as described above, comprising the steps of: - forming a front transparent layer; - forming a colored decorative layer; - forming a metal-like decorative layer; - forming an adhesion promoter layer; and - Step of forming the posterior layer whereby an adhesion promoter layer is disposed between the metallic-like decorative layer and the rear layer, and a colored decorative layer is disposed between the front transparent layer and the metallic-like decorative layer.

[0023] The method may also include the steps of masking uncoated areas on the colored decorative layer, applying an ink layer on the adhesion promoter layer, and / or masking masked areas on the ink layer.

[0024] Preferably, the front transparent layer is formed by injection molding of a transparent layer or by laminating a transparent foil.

[0025] Also preferably, the formation of the colored decorative layer is carried out by depositing the colored decorative layer onto the front transparent layer or by insert molding, and / or the formation of the metallic decorative layer and the adhesion promoter adhesive layer is carried out by deposition, and / or the formation of the rear layer is carried out by insert molding.

[0026] The insert molding process eliminates the intentionally defined air gap between the plastic molded parts, which complicates the manufacturing process to keep the air gap constant at a small dimension of approximately 0.1 mm. Additionally, the variation and growth of the air gap leads to a degradation of the transmission performance of the radome.

[0027] The absence of voids eliminates the possibility of water infiltrating into the gaps, which could damage the inner layer.

[0028] The proposed solution provides a chemical bond before the mechanical bond which avoids the formation of voids during thermal cycling due to the different thermal expansion coefficients of the plastic materials involved.

[0029] The use of adhesion promoters and inks to increase adhesion instead of adhesives or inner protective coatings allows for the use of air spray deposition methods and ultra-fast drying processes.

[0030] Depositing the metallic decorative layer, adhesion promoter layer, and optionally the ink layer only on selected areas allows for better adhesion due to the direct connection between the insert molded rear layer on the front set formed by the transparent layer and the colored decorative layer. [Brief explanation of the drawings]

[0031] For a better understanding of the above description and for the purpose of providing examples only, some non-limiting drawings are included which schematically depict practical embodiments.

[0032] [Figure 1] 1 is a partial isometric view of a vehicle having a radome disposed within a grille assembly and a radar antenna disposed behind the radome, constructed in accordance with and embodying the present invention; [Figure 2] FIG. 1 is a front view of a radome in which the manufacturer's emblem can be identified by the contrast between colored and light areas. [Figure 3] 3 is a schematic cross-sectional view according to AA in FIG. 2 showing the different layers of the first embodiment; [Figure 4] 3 is a schematic cross-sectional view according to AA in FIG. 2 showing the different layers of the second embodiment; [Figure 5] 1 is a flow chart of optional manufacturing steps for the transparent layer and colored decorative layer of the radome according to the present invention. [Figure 6] 6 is a flowchart of the maskless manufacturing steps for the metallic decorative layer, adhesion promoter layer, and optional ink layer of a radome according to the present invention, which are performed after the steps shown in FIG. 5. [Figure 7] 7 is a flowchart of a manufacturing step of a radome according to the present invention, in which masking is performed for the metallic decorative layer, adhesion promoter layer, and optional ink layer, which is performed after the step of FIG. 5 and as an alternative to the step of FIG. 6. [Figure 8] 8 is a flow chart of manufacturing steps for the aft layer of a radome according to the present invention, which are performed after the steps of FIG. 6 or FIG. 7. DETAILED DESCRIPTION OF THE INVENTION

[0033] DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring now in detail to the drawings, in which like numerals are used to designate like components throughout, as illustrated in FIG. 1, reference numeral 1 generally designates a decorative radome constructed in accordance with and embodying the present invention and configured for mounting within a grille assembly 2 of a motor vehicle 3.

[0034] A radar antenna 4 is positioned within the vehicle 3 behind and aligned with the decorative radome 1 .

[0035] FIG. 2 shows a front view of the radome 1, where the radio-transmissive colored layer 6 and the bright decorative layer 7 are visible, which provide a metallic appearance while maintaining high transparency to signals emitted and received by the protected radar antenna 4.

[0036] [Embodiment 1] In the following, a first embodiment of a void-free radome will be described with reference to Figure 3, which shows a schematic cross-section of the radome 1. The positions of the different layers within the radome 1 can be observed. The thicknesses of the different layers are not to scale, since the relationships between them range over several orders of magnitude. The different layers will be described from the proximal surface (closer to the external observer, on the right in this figure) to the distal surface (closer to the radar 4, on the left in this figure).

[0037] The radome 1 comprises a front transparent layer 5. The front transparent layer 5 is made of a material that has high transparency for both visible light and the signals emitted and received by the protected radar 4. The front transparent layer 5 can be made of a plastic resin such as polycarbonate (PC) and can be obtained by injection molding or by cutting a laminated film of this material into the final desired shape.

[0038] As mentioned above, the radome 1 also comprises a colored decorative layer 6 that provides opacity to visible light while maintaining a high degree of transmission of signals emitted and received by the protected radar 4. The colored decorative layer 6 partially covers one of the faces of the transparent layer 5, leaving some uncovered areas 11.

[0039] This colored decorative layer 6 can be obtained by printing a decorative ink onto the surface of the transparent layer 5 obtained by any of the manufacturing methods described above. This printing process requires the use of a mask in order to leave some areas 11 uncovered by the colored decorative layer 6.

[0040] Alternatively, the colored decorative layer 6 can be obtained by injection molding in a combined manufacturing process with the transparent layer 5. The colored decorative layer 6 is depicted on the distal surface of the transparent layer 5. However, the colored decorative layer 6 may also be arranged on the proximal surface of the transparent layer 5.

[0041] FIG. 5 shows alternative steps (5-6-A, 5-6-B or 5-6-C) for producing or forming a combination of a transparent layer 5 and a colored decorative layer 6.

[0042] Manufacturing step 5-6-A includes a first step of injection molding a transparent layer 5 using a plastic resin, such as polycarbonate (PC), that has high transparency to both visible light and the signals emitted and received by the protected radar 4. Once the plastic part is molded, it is decorated on one of its faces with a colored decorative layer 6, leaving some uncovered areas 11. The composition and thickness of the colored decorative layer (with guideline values ​​between 10 and 50 μm) can provide opacity to visible light while maintaining a high degree of transparency to the signals emitted and received by the protected radar 4.

[0043] There are three main manufacturing techniques that can be used to deposit the colored decorative layer 6: pad printing, hot stamping, and spray painting.

[0044] Pad printing can transfer a 2D image with colored and uncoated areas onto a 3D transparent layer obtained by an injection molding process. First, a deformable transfer pad is pressed down onto the printing plate, transferring the ink with the etched image areas from the printing plate to the pad. Then, the transfer pad is pressed onto the 3D transparent layer 5, transferring the ink layer obtained from the printing plate to the 3D transparent layer 5. An additional step of ink drying may be required, which may include infrared curing.

[0045] The hot stamp transfers the pre-dried ink or foil onto the surface of the transparent layer 5. The heated mold has a 3D design corresponding to the molded transparent layer 5, protruding surfaces corresponding to the colored decorative layer 6, and recessed surfaces corresponding to the uncoated areas 11. The mold presses the foil onto the plastic, transferring the pre-dried ink or foil through a combination of temperature and pressure.

[0046] Spray painting is also applicable. This process can also decorate the surface of the 3D transparent layer 5. However, in order to decorate only some areas corresponding to the decorative layer 6, a prior process of masking the desired non-coated areas 11 is required before spray painting. This deposition process includes an ink drying step. Finally, the mask is removed to obtain a part with the desired decoration.

[0047] Manufacturing process 5-6-B starts with laminated transparent foil, typically sourced in roll packaging. Its material composition and transparency performance are very similar to the injection-molded version, and polycarbonate (PC) is also a popular choice.

[0048] The three manufacturing techniques mentioned above (pad printing, hot stamping, and spray painting) for depositing the colored decorative layer 6 are also applicable in a similar manner and with similar considerations. In addition, since the foil has a 2D structure, screen printing techniques are also applicable. Screen printing is based on a mesh with an ink-blocking stencil corresponding to the desired non-coated areas 11. Ink or paint is pressed through the mesh onto the foil forming the decorative layer 6. This deposition process includes an ink drying step.

[0049] The final step is shaping and cutting, for example using thermoforming techniques, to obtain the desired shape.

[0050] Manufacturing step 5-6-C is characterized by the absence of any ink or paint deposition, for example, a layer that is both optically transparent and opaque (transmittable to both the signals emitted and received by the protected radar 4) is obtained by injection molding of a similar material such as polycarbonate (PC).

[0051] In the first step, the colored decorative layer 6 is injection molded in the standard manner. The second step is a process of insert molding the transparent layer 5, which surrounds the colored decorative layer 6.

[0052] The radome 1 according to the invention also comprises a metallic-like decorative layer 7 deposited on the distal face (closer to the radar 4) of the set formed by the transparent layer 5 and the colored decorative layer 6. The colored decorative layer 6 is visible to an outside observer through the uncovered areas 11 of the colored decorative layer 6. The combination of the opaque and discontinuous areas of the colored decorative layer 6 and the metallic-like decorative layer 7 results in an emblem visible to an outside observer, as shown in Figure 2.

[0053] The metallic decorative layer 7 provides a bright appearance by using metals, metalloids, and / or oxides. In any case, the metallic decorative layer 7 must ensure high electrical resistivity in order to reduce the attenuation it causes to the signals emitted and received by the protected radar 4. This thin and controlled thickness layer can be deposited, for example, by a physical vapor deposition (PVD) magnetron sputtering process or by a plasma enhanced chemical vapor deposition (PECVD) process, depending on the composition of this layer.

[0054] Since the composition and manufacturing process of the metallic decorative layer 7 do not provide good adhesion to the rear layer 10 obtained by the insert molding process, some surface treatment must be performed on the metallic decorative layer 7 to improve it.

[0055] The radome 1 according to the present invention also includes an adhesion promoter layer 8 applied over the metallic-like decorative layer 7. This adhesion promoter layer 8 is bifunctional, creating a direct bond between adjacent layers, and is not an adhesive, which would create an independent bond between the adhesive and each one of the layers to be bonded. This adhesion promoter layer 8 is very thin, thereby providing improved interfacial bonding properties, yet not so thick that its bulk properties significantly affect the overall properties of the bond.

[0056] The adhesion promoter layer 8 can be advantageously applied by air spraying due to its low viscosity (maximum 30 mPa·s), forming a dry layer up to 20 μm thick. In addition, the adhesion promoter layer 8 dries in 30 to 90 seconds at room temperature. This is a significant improvement over two-component acrylic paint coatings, which typically require a 1-hour heating period at 80°C in a chamber to evaporate the solvent, or over solvent-based adhesive coatings, which exhibit a viscosity of 500 mPa·s and have a drying time of 0.5 to 3.5 hours at 70 to 90°C.

[0057] Optionally, a polymer-compatible ink layer 9 may be applied onto the adhesion promoter layer 8. The ink layer 9 is composed of an ink that is used to apply onto plastic parts of the same polymer as the raw material of the rear layer 10. This ink is similar to the ink that can be used to produce the colored decorative layer 6.

[0058] It differs in that the ink layer 9, instead of conforming to the material of the transparent layer 5, conforms to the material of the rear layer 10.

[0059] Its function is to provide some additional protection for the metallic decorative layer 7 prior to the high temperatures associated with the insert molding process. Being an ink, it can be dissolved in a solvent that makes the ink compatible with the air spray method, with a viscosity of less than 30 seconds when tested by the Ford Viscosity Cup No. 4 method. The dried layer can have a thickness of up to 30 μm.

[0060] The decision to use this optional ink layer 9 may be based on the heat sensitivity of the material used in the metallic decorative layer 7 .

[0061] FIG. 6 shows the manufacturing steps for sequentially depositing a metallic decorative layer, an adhesion promoter layer and, optionally, an ink layer on the distal face of a preformed part of a transparent layer 5 having a colored decorative layer 6.

[0062] As a first step, the transparent layer 5 with the colored decorative layer 6 is placed in a chamber that can perform a physical vapor deposition (PVD) magnetron sputtering process or a plasma-enhanced chemical vapor deposition (PECVD) process, depending on the composition of the layer. A preformed part is placed in the chamber in such a way that a metallic-like decorative layer 7 is deposited on the distal surface of the part accommodated by the chamber. This deposited metallic-like decorative layer will be in direct contact with the transparent layer 5 with the colored decorative layer 6, and since no masking on the distal surface has been previously applied, the metallic-like decorative layer 7 will entirely cover both the transparent and colored areas.

[0063] The preformed part is transferred to a painting chamber where an air spray painting method can be applied. This equipment is capable of spraying a substance with a specified viscosity onto a given surface. The substance can be an adhesion promoter containing a high proportion of organic solvents, such as cyclohexane, xylene, ethylbenzene, ethyl alcohol, ethyl acetate, or toluene, or a type designed to improve the adhesion of polyurethane-based adhesives or sealants on glass, plastics, painted surfaces, and metals. It can be fabricated with a low viscosity (less than 30 mPa·s) suitable for the air spray painting process. The preformed part is placed in the chamber in such a way that an adhesion promoter layer 8 is deposited on the distal surface of the part accommodated by the chamber. This deposited adhesion promoter layer 8 comes into direct contact with the metal-like decorative layer 7, and since no masking has been previously applied to the distal surface, the adhesion promoter layer 8 completely covers the metal-like decorative layer 7.

[0064] The painting process includes a fast drying step of 30 to 90 seconds at room temperature.

[0065] The manufacturing process may optionally include an additional air spray painting process in the same or a different painting chamber. The painting process is carried out using an ink that is used to apply the same polymer to the plastic part as the raw material that will be used to form the rear layer 10, in order to enhance their mutual adhesion. A preformed part is placed in the chamber in such a way that an ink layer 9 is deposited on the distal surface of the part accommodated by the chamber. This deposited ink layer 9 will be in direct contact with the adhesion promoter layer 8, and since no masking on the distal surface has been previously applied, the ink layer 9 will completely cover the adhesion promoter layer 8.

[0066] The painting process includes a drying step, where different conditions of temperature and time can be defined.

[0067] As mentioned above, the posterior layer 10 is applied to the distal-most surface by an insert molding process of the remaining layers described above, and its raw material can be acrylonitrile butadiene styrene (ABS) or a blend of polycarbonate and acrylonitrile butadiene styrene (PC / ABS).

[0068] They require lower molding temperatures than those used for polycarbonate (PC), which reduces the risk of damaging the sensitive metallic-like decorative layer 7. The rear layer 10 provides final protection for the inner decorative layer and typically includes the fasteners of the radome 1 to the rest of the vehicle. The rear layer 10 also provides additional opacity to visible light for the entire radome 1.

[0069] As described above, the use of adhesion promoter layer 8 and optional ink layer 9 allows for the use of an insert molding manufacturing process, which ensures the absence of voids that could degrade the transmission performance of the radome or complicate the manufacturing process to achieve minimal and consistent voids throughout the radome's field of view. The adhesion achieved between layers also avoids voids that would otherwise occur during thermal cycling in laboratory tests or over the life of the product.

[0070] The small total combined thickness of the adhesion promoter layer 8 and the ink layer 9 (max 20 μm + max 30 μm = max 50 μm) provides a high degree of freedom in the selection of these components, even if they have significantly different dielectric properties than the transparent layer 5 and the rear layer 10, without affecting the transmission performance of the radome 1.

[0071] In cases where mechanical or corrosion requirements are severe, a hard coating of varnish may be applied on the proximal and / or distal surfaces of the set of layers described above.

[0072] FIG. 8 shows the manufacturing process for insert molding of the rear layer 10 and hard coating for severe mechanical or corrosion requirements.

[0073] The first step is to place a preformed part in a plastic injection mold. An insert molding process is performed, in which molten raw material is deposited onto the distal face of the preformed part. This molded rear layer 10 will be in direct contact with the adhesion promoter layer 8 (or ink layer 9, if applied), and since no masking on the distal surface has been previously applied, the rear layer 10 will entirely cover the adhesion promoter layer 8 (or ink layer 9, if applied).

[0074] [Embodiment 2] A second embodiment of the gap-free radome 1 will be described below with reference to Fig. 4. In the second embodiment, the same reference numerals are given to components that are the same as or similar to the corresponding components in the first embodiment, and duplicated descriptions will be omitted in this specification.

[0075] The production of the combination of transparent layer 5 and colored decorative layer 6 is identical to that described for embodiment 1 according to FIG.

[0076] In this second embodiment, a mask is applied to substantially cover the opaque areas defined by the colored decorative layer 6. The use of such a masking process is maintained throughout the deposition of the metallic decorative layer 7, the adhesion promoter layer 8, and the optional ink layer 9. This results in masked areas 12 that are free of these layers when the mask is removed.

[0077] 7 shows manufacturing steps for sequentially depositing a metallic decorative layer, an adhesion promoter layer, and optionally an ink layer on the distal face of a preformed part of a transparent layer 5 bearing a colored decorative layer 6. These alternative steps allow these layers not to be deposited on the opaque areas defined by the colored decorative layer 6.

[0078] As a first step, a masking is applied onto the distal face of the preformed part, which covers the opaque areas defined by the colored decorative layer 6, protecting them and preventing them from being covered by the metallic decorative layer 7, the adhesion promoter layer 8 and, optionally, the ink layer 9. This masking defines the shape of the masking area 12.

[0079] Once the mask has been applied, the metal-like decorative layer 7, the adhesion promoter layer 8 and the optional ink layer 9 are applied as described for embodiment 1 according to FIG.

[0080] Once the last layer has been applied, the final step of the manufacturing process is carried out, shown in Figure 7. The mask is removed, leaving masked areas 12 free of the metal-like decorative layer 7, adhesion promoter layer 8, and optional ink layer 9.

[0081] The end result of this manufacturing process is a part whose distal surface has some areas where the adhesion promoter layer 8 (or ink layer 9, if applied) is visible and some areas where the colored decorative layer 6 is visible (corresponding to masking areas 12).

[0082] The rear layer 10 is also manufactured by insert molding. Some areas of its proximal surface will be in contact with the adhesion promoter layer 8 (or ink layer 9, if applied), and some other areas will be in contact with the set formed by the transparent layer 5 and the colored decorative layer 6. This masking process improves the adhesion between the rear layer 10 and the rest of the radome 1, but adds an additional step to the manufacturing process.

[0083] The manufacturing process for insert molding of the rear layer 10 and hard coating for severe mechanical or corrosion requirements is identical to that described for embodiment 1 according to Figure 8. The result differs in the sense that the molten raw material deposited on the distal face of the preformed part will in some areas be in direct contact with the adhesion promoter layer 8 (or ink layer 9, if applied) and in some other areas (corresponding to the masking areas 12) with the colored decorative layer 6.

[0084] Although reference has been made to specific embodiments of the present invention, it will be obvious to those skilled in the art that the vehicle radome described herein is susceptible to numerous variations and modifications, and that all the details described may be replaced by technically equivalent alternatives without departing from the scope of protection defined by the appended claims.

Claims

1. A radome for a vehicle (1), a front transparent layer (5), a metallic decorative layer (7), a posterior layer (10), an adhesion promoter layer (8) placed between said metallic decorative layer (7) and said back layer (10); a colored decorative layer (6) arranged between said front transparent layer (5) and said metallic-like decorative layer (7),

2. 2. The vehicle radome (1) according to claim 1, wherein the adhesion promoter layer (8) has a viscosity of less than 30 mPa·s.

3. 3. The vehicle radome (1) according to claim 1 or 2, wherein the adhesion promoter layer (8) has a thickness of less than 20 μm.

4. 2. The vehicle radome (1) according to claim 1, wherein the colored decorative layer (6) is provided with uncovered areas (11).

5. 5. The vehicle radome (1) according to any one of claims 1 to 4, wherein the radome (1) also comprises an ink layer (9) applied onto the adhesion promoter layer (8).

6. 6. The vehicle radome (1) according to claim 5, wherein the ink layer (9) is disposed between the adhesion promoter layer (8) and the rear layer (10).

7. 7. The vehicle radome (1) according to any one of claims 1 to 6, wherein the metallic decorative layer (7), the adhesion promoter layer (8) and / or the ink layer (9) are provided with masking areas (12).

8. 8. The vehicle radome (1) according to claim 6 or 7, wherein the masking areas (12) of the metallic decorative layer (7), the adhesion promoter layer (8) and / or the ink layer (9) are arranged to coincide with each other.

9. 2. The radome (1) for a vehicle according to claim 1, wherein the metallic decorative layer (6) is made of a metal, a metalloid and / or an oxide.

10. A method for manufacturing a vehicle radome (1) comprising: - forming the front transparent layer (5), - forming a colored decorative layer (6), - forming a metallic decorative layer (7), - forming an adhesion promoter layer (8), and - forming the rear layer (10) whereby the adhesion promoter layer (8) is disposed between the metallic-like decorative layer (7) and the rear layer (10), and the colored decorative layer (6) is disposed between the front transparent layer (5) and the metallic-like decorative layer (7).

11. 11. The method for manufacturing a vehicle radome (1) according to claim 10, further comprising a step of masking non-coated areas (11) on the colored decorative layer (6).

12. 12. A method for manufacturing a vehicle radome (1) according to claim 10 or 11, also comprising the step of applying an ink layer (9) onto said adhesion promoter layer (8).

13. 13. The method for manufacturing a vehicle radome (1) according to claim 12, further comprising the step of masking a masking area (12) on said ink layer (9).

14. 11. The method for manufacturing a vehicle radome (1) according to claim 10, wherein the forming of the front transparent layer (5) is performed by injection molding of the transparent layer (5) or by laminating a transparent foil.

15. 11. The method for manufacturing a vehicle radome (1) according to claim 10, wherein the formation of the colored decorative layer (6) is carried out by depositing the colored decorative layer (6) on the front transparent layer (5) or by insert molding, and / or the formation of the metallic-like decorative layer (7) and the adhesion promoter adhesive layer (8) is carried out by depositing, and / or the formation of the rear layer (10) is carried out by insert molding.

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