Cover plate, injection mold, automotive light and motor vehicle

Abstract

Cover plate (1) for a motor vehicle lamp (8), wherein the cover plate (1) an interior surface (2), an outer surface (3) opposite the inner surface (2), a transparent body (4), an opaque body (5) and a coating (6) wherein the coating (6) comprises PU polyurethane, characterized in that the transparent body (4), the opaque body (5) and the coating (6) are manufactured in such a single piece, preferably using an injection molding process, that the outer surface (3) is formed exclusively on the coating (6) and on the opaque body (5), wherein the coating (6) as seen from the outer surface (3) towards the inner surface (2) completely covers the transparent body (4) and only partially covers the opaque body (5), wherein the area of ​​the coating (6) that completely covers the transparent body (4) forms a usable section (6a) of the coating and wherein the area of ​​the coating (6) that only partially covers the opaque body (5) forms at least a first subsection (6b) of the coating (6), which first subsection (6b) is formed at least partially in an overflow cavity (31) in the injection process of the coating (6).

Description

[0001] The invention relates to a cover plate for a motor vehicle light, wherein the cover plate has an inner surface, an outer surface opposite the inner surface, a transparent body, an opaque body and a coating, wherein the coating comprises PU polyurethane.

[0002] Such a cover plate can be connected to a housing, for example by screwing, snapping, or preferably at least gluing, to form a closed space with the housing. Such cover plates are well known and must meet certain requirements, particularly when used in automotive lighting. Firstly, such cover plates should be at least partially transparent to visible light. Secondly, such cover plates should meet aesthetic requirements, which is why an opaque and a transparent part are usually formed as a single unit, so that at least part of the cover plate appears clear and is transparent to visible light. Furthermore, coatings are used to make the transparent area of ​​such cover plates resistant to scratches, chemicals, or ultraviolet light to a certain degree.

[0003] In addition to hard coatings, which are applied in lacquer form with appropriate solvents, coatings containing polyurethane (PU) have also become known for protecting such cover plates. The advantage of such a PU polyurethane coating is, in particular, the possibility of integrating the coating process into a fully automated injection molding production line, as described, for example, in EP3878620A1.

[0004] Since such a coating, which contains polyurethane (PU), can only be applied in a fully automated injection molding process through an airtight cavity due to its low viscosity, overflow cavities are necessary in the injection mold to accommodate the air displaced by the coating material. These overflow cavities result in a deformation on the cover plate. This deformation must be separated after the injection molding process and the joint sealed in a complex process. Longer processing times and a reduced surface finish at the joint are the consequences.

[0005] It is therefore an object of the invention to provide a cover plate and an injection molding tool in order to overcome the aforementioned disadvantages at least to some extent, without significantly influencing the appearance of the cover plate.

[0006] The problem is solved with the aforementioned cover plate, wherein the transparent body, the opaque body, and the coating are manufactured in such a single, continuous piece, preferably using an injection molding process, that the outer surface is formed exclusively on the coating and the opaque body, wherein the coating, viewed from the outer surface towards the inner surface, completely covers the transparent body and only partially covers the opaque body, wherein the area of ​​the coating completely covering the transparent body forms a usable section of the coating, and wherein the area of ​​the coating only partially covering the opaque body forms at least a first subsection of the coating, which first subsection is at least partially formed in an overflow cavity during the injection process of the coating.

[0007] Advantageously, the usable area of ​​the coating, viewed from the outer surface towards the inner surface, has a thickness between 0.1 mm and 0.9 mm.

[0008] Preferably, the first section of the coating has a thickness that is less than or equal to, preferably equal to, the thickness of the usable section of the coating.

[0009] In an advantageous embodiment, the coating area that only partially covers the opaque body additionally forms a second subsection, which is formed separately from the first subsection in a sprue cavity during the coating injection process. This eliminates the need for subsequent separation and sealing of the coating's sprue point.

[0010] To ensure optimal quality of the usable section, the second subsection is preferably formed along the outer surface, essentially on an opposite area of ​​the coating.

[0011] Preferably, the opaque body comprises a material that is resistant to at least one external influence selected from a group of external influences, which group includes influences from adverse weather conditions, mechanical influences, influences from solar radiation or influences from chemicals.

[0012] For example, a material is considered to be resistant to the effects of adverse weather conditions if at least one test, selected from a group of tests including DIN EN 60068-2-2, e.g. v2008-05; PV 1200, e.g. v2004-10; PV 3930, e.g. v2008-03; DIN EN ISO 6270-1, e.g. 2018-04, does not result in any significant visible changes, such as color changes, loss of gloss, cracks or blisters.

[0013] For example, a material possesses resistance to mechanical impacts or influences such as stone chips if the test according to DIN EN ISO 20567-1, e.g., version 2017-07, yields a characteristic value of less than or equal to 3, preferably less than or equal to 2. Alternatively or additionally, the material may possess resistance to mechanical impacts or influences such as those occurring in a car wash if a certain degree of turbidity, as defined, for example, in DIN EN ISO 13803, e.g., version 2015-02, is less than or equal to the degree of turbidity of a reference material after testing according to DIN EN ISO 20566, e.g., version 2021-06. Such a reference material is, for example, the coating material UVKC3000k.

[0014] For example, resistance to the influence of solar radiation and the associated UV exposure exists if the material, after testing, for example according to PV 3930, e.g. v2022-04, shows no significant visible changes such as color changes, loss of gloss, cracks or blisters.

[0015] For example, resistance to the influence of chemicals exists if a material, after testing according to ISO 16750-5, e.g., v2010-04, shows no significant visible changes, such as discoloration, loss of gloss, cracks, or blisters. The chemicals used in the test may depend on the material's mounting location. In intended use, those chemicals that correspond to the mounting location [D], i.e., mounting on the exterior, may be considered load-bearing.

[0016] If a specific number of test cycles can be defined in the above-mentioned testing standards, at least one test cycle must be carried out in order to subsequently assess the resistance of the material to be tested to the aforementioned external influences.

[0017] A described cover lens for a motor vehicle light can be manufactured using an injection molding process, the injection molding process comprising the following steps: • Providing an injection mold to form a first cavity, • Injection molding of a transparent body in the first cavity, • Providing an injection molding tool to form a second cavity, • Injection molding of an opaque body in the second cavity, wherein either the first cavity is partially bounded by the opaque body or the second cavity is partially bounded by the transparent body in such a way that the transparent body and the opaque body are joined together in one piece during injection molding, • Providing an injection mold for forming a flood cavity, which flood cavity is partially bounded by the transparent body and partially by the opaque body, where the opaque body partially borders at least one overflow cavity, which is at least one overflow cavity that is part of the flood cavity, • Injection molding of a coating in the flood cavity by injecting a coating material into the flood cavity, wherein the coating material contains PU polyurethane, during the injection process into the flood cavity, air located in the flood cavity is displaced by the coating material into at least one overflow cavity, • Demolding of the cover plate.

[0018] Advantageously, it can be provided that during the injection molding of the coating material into the flood cavity, the flood cavity is filled with the coating material against gravity.

[0019] It is advantageous that the opaque body is injection-molded from a material or has a material that is resistant to at least one external influence, selected from a group of external influences, which group includes influences from adverse weather conditions, mechanical influences, influences from solar radiation or influences from chemicals.

[0020] Furthermore, the object of the invention is solved with an injection molding tool for producing a cover lens for a motor vehicle light, wherein the injection molding tool has a first tool half and a second tool half, wherein the first tool half is designed to receive an injection-molded cover plate blank, which cover plate blank has a transparent body and an opaque body integrally connected to it, wherein a flood cavity can be formed in a closed form between the first tool half and the second tool half, which flood cavity is partially bounded by the second tool half, partially by the transparent body and partially by the opaque body of the cover disc blank that can be received by the first tool half, wherein the flood cavity has at least one overflow cavity which overflow cavity is designed to receive air contained in the flood cavity when it is displaced by injecting coating material into the flood cavity, wherein at least one overflow cavity is essentially partially bounded by the second tool half and partially by the opaque body of the cover disc blank that can be received by the first tool half.

[0021] It may be advantageous to provide that at least one overflow cavity in the closed form of the tool halves is arranged against a flow path of the coating material during injection and with respect to a gate point of the coating material from which the flow path originates, essentially at the furthest point.

[0022] The invention further relates to a motor vehicle light with a cover lens of the type mentioned.

[0023] Furthermore, the invention relates to a motor vehicle with such a motor vehicle light.

[0024] The invention is illustrated below with the aid of exemplary and non-limiting figures. These figures show Fig. 1 a front view of a cover plate, Fig. 2 a sectional view of the cover plate, Fig. 3a to Fig. 3D schematic of individual steps of an injection molding process, Fig. 4 a sectional view of a motor vehicle light, and Fig. 5 a motor vehicle.

[0025] The invention will now be described alternately based on the Fig. 1 and Fig. 2 explained in more detail.

[0026] Fig. Figure 1 shows a cover plate 1 in an orthogonal front view. The cover plate 1 has an inner surface 2 and an outer surface 3 opposite the inner surface 2. "Front" therefore refers to a direction from the inner surface 2 to the outer surface 3 of the cover plate 1. In the illustration shown, only the outer surface 3 of the cover plate 1 is visible. The outer surface 3 can be defined as that part of the cover plate 1 which, when installed or in its intended use, may be exposed to certain external influences. Conversely, the inner surface 2 of the cover plate 1 can be defined as that part of the cover plate 1 which, when installed or in its intended use, is not exposed to any or at least a smaller number of external influences, as it is protected, for example, by a housing 7.

[0027] External influences can include, in particular, influences from adverse weather conditions, influences from mechanical impacts such as stone chips, ice scrapers or the like, influences from solar radiation or the associated UV exposure, as well as chemical influences such as acids, alcohols, cleaning agents or oils.

[0028] Accordingly, the cover plate 1, or rather that part of the cover plate 1 that may be exposed to external influences – namely the outer surface 3 – must be resistant to at least certain external influences. This resistance can be assessed, for example, based on several criteria.

[0029] For example, a material is considered resistant to adverse weather conditions if at least one test, selected from a group of tests including DIN EN 60068-2-2, e.g. v2008-05; PV 1200, e.g. v2004-10; PV 3930, e.g. v2008-03; DIN EN ISO 6270-1, e.g. 2018-04, does not result in any significant visible changes, such as color changes, loss of gloss, cracks or blisters.

[0030] For example, a material possesses resistance to mechanical impacts or influences such as stone chips if the test according to DIN EN ISO 20567-1, e.g., v2017-07, yields a characteristic value of less than or equal to 3, preferably less than or equal to 2. Alternatively or additionally, the material may possess resistance to mechanical impacts or influences such as those occurring in a car wash if a certain degree of turbidity, as defined, for example, in DIN EN ISO 13803, e.g., v2015-02, is less than or equal to the degree of turbidity of a reference material after a test according to DIN EN ISO 20566, e.g., v2021-06. Such a reference material is, for example, the coating material UVKC3000k.

[0031] For example, resistance to the influence of solar radiation and the associated UV exposure exists if the material, after testing, for example according to PV 3930, e.g. v2022-04, shows no significant visible changes such as color changes, loss of gloss, cracks or blisters.

[0032] For example, resistance to the influence of chemicals exists if a material, after testing according to ISO 16750-5, e.g., v2010-04, shows no significant visible changes, such as discoloration, loss of gloss, cracks, or blisters. The chemicals used in the test may depend on the material's mounting location. In intended use, those chemicals that correspond to the mounting location [D], i.e., mounting on the exterior, may be considered load-bearing.

[0033] If a specific number of test cycles can be defined in the above-mentioned testing standards, at least one test cycle must be carried out in order to subsequently assess the resistance of the material to be tested to the aforementioned external influences.

[0034] Alternatively or additionally, certain basic requirements may apply depending on the application market. For example, if the cover lens 1 is used in a motor vehicle light 8, certain ECE, CCC, or FMVSS regulations must be observed with regard to resistance to external influences.

[0035] The cover plate 1 shows, as in Fig. 2, a transparent body 4, an opaque body 5 and a coating 6. Fig. 2 shows a cross-sectional view along the AA line from Fig. 1. The transparent body 4, the opaque body 5, and the coating 6 form a single, integrally connected cover plate body between the inner surface 2 and the outer surface 3. In other words, the transparent body, the opaque body 5, and the coating 6 are arranged between the inner surface 2 and the outer surface 3, wherein the inner surface 2 and the outer surface 3 are surface parts of the cover plate 1 and together form the total surface area of ​​the cover plate 3. Preferably, the cover plate 1 is manufactured by an injection molding process. This injection molding process will be described later.

[0036] The coating 6 consists of PU polyurethane or at least contains PU polyurethane. The coating 6 is preferably transparent. The coating 6 can be applied using a low-pressure injection molding process, such as reaction injection molding. The advantage of such a PU polyurethane coating 6 lies particularly in its ability to smooth out mechanical deformations, e.g., scratches, by applying heat to the coating 6. Sufficient heat can be generated by ambient heat. In particular, sunlight striking the coating 6 can provide the necessary heat. It is also conceivable that, for example, a light source could provide the necessary heat to the coating 6 of the cover plate 1. For instance, appropriately coated, scratched material can regain its elasticity within seconds at 60°C, thus repairing existing scratches.

[0037] As can be seen, the outer surface 3 is formed exclusively by the coating 6 and the opaque body 5. This means that the surface part of the cover lens 1 which may be exposed to external influences during normal use is formed solely by the coating 6 and the opaque body 5. Crucially, the outer surface 3 is not formed by the transparent body 4. The transparent body 4 can, for example, consist of PC (polycarbonate) or PMMA (polymethyl methacrylate), or at least contain these materials. These materials are characterized by a high transmittance of light in the visible range and are therefore particularly suitable for use in automotive lights 8. However, these materials are susceptible to at least some of the aforementioned external influences and therefore require a suitable coating 6 that is resistant to one, several, or all of the aforementioned influences.Transparent body 4 can also be colored. For example, transparent body 4 can be colored red.

[0038] The opaque body 5 can be made of, or at least comprise, a material that is resistant to at least one, several, or all of the aforementioned external influences. Preferably, the opaque body 5 is resistant at least to the influence of chemicals. For example, a thermoplastic terpolymer, preferably ABS acrylonitrile butadiene styrene, is a possible material for the opaque body 5. The opaque body 5 can therefore be made of, or at least comprise, ABS acrylonitrile butadiene styrene. For example, the opaque body 5 can consist of a combination of PC polycarbonate and ABS acrylonitrile butadiene styrene. The opaque body 5 can thus have a lower light transmittance than the transparent body 4. Therefore, "opaque" should not necessarily be understood to mean a completely light-impermeable material. Furthermore, the opaque body 5 can also be colored.

[0039] It is possible that the opaque body 5 is subject to lower requirements regarding resistance to external influences, as certain resistances are ensured by other means. For example, through the appropriate use of the cover lens 1 in a motor vehicle light 8, the opaque body 5 can be protected from certain external influences by protective elements such as the hood, convertible top elements, bezels, or a bumper. For example, such protective elements are designed to protect the opaque body 5 of the cover lens 1 on its outer surface 3 from external influences such as sunlight and the associated UV exposure, as well as from external mechanical impacts.In such a suitable use of the cover plate 1 and in conjunction with the aforementioned protective elements, a portion of the resistance to external influences can therefore be eliminated for that area of ​​the outer surface 3 which is formed by the opaque body 5.

[0040] This coating 6 completely covers the transparent body 4, viewed from the outer surface 3 towards the inner surface 2. The opaque body 5 is only partially covered by the coating 6, viewed from the outer surface 3 towards the inner surface 2. The area of ​​the coating 6 that completely covers the transparent body 4 forms a functional section 6a, which is therefore part of the coating 6. Although only a single functional section 6a is shown, several functional sections are conceivable. In particular, with an embodiment using a suitably designed opaque body 5, several transparent windows can be formed, potentially resulting in several functional sections. Conversely, the area of ​​the coating 6 that only partially covers the opaque body 5, again viewed from the outer surface 3 towards the inner surface 2, forms subsections 6b, 6c, and 6d of the coating 6.The area of ​​the coating 6 that only partially covers the opaque body 5 thus forms at least a first subsection 6b. This first subsection 6b is formed in an overflow cavity 31 during the injection process of the coating 6.

[0041] A second subsection 6c of the coating 6, which partially covers the opaque body 6, may have been formed in a sprue cavity during the injection molding process of the coating 6. A third subsection 6d of the coating 6, which also partially covers the opaque body 6, may have been formed in a further overflow cavity during the injection molding process of the coating 6. The injection molding process comprises the injection molding of the coating 6 in a flood cavity 30, which flood cavity 30 has at least one overflow cavity 31.

[0042] The surface finish of the first subsection 6b, or of all subsections 6b, 6c, 6d, may differ from the surface finish of the functional section 6a. For example, the air displaced into the overflow cavity 31 during the injection process of the coating material may lead to meniscus formations (shown in Fig. 1) along the edge region of the first subsection 6b and the third subsection 6d. The second subsection 6c, which is formed in the sprue cavity during the injection process of the coating 6, may exhibit a difference in surface finish compared to the functional section 6a due to the sprue point. However, the first subsection 6b, or indeed all subsections 6b, 6c, 6d, are not or only barely perceptible to an observer when viewed from the outer surface 3 to the inner surface 2, as they partially cover the opaque body 5.

[0043] Although only a limited number of subsections 6b, 6c, 6d are shown, any number of subsections can be provided. Depending on the geometry and shape of the cover plate 1, i.e., depending on the geometry and shape of the transparent body 5 and the opaque body 5, further subsections are therefore conceivable. All subsections 6b, 6c, 6d can be connected to each other via the functional section 6a. These subsections 6b, 6c, 6d are therefore not directly connected to each other. The functional section 6a and the subsections 6b, 6c, 6d together form the coating 6.

[0044] Viewed from the outer surface 3 towards the inner surface 2, the coating 6 has a specific thickness. This thickness can be between 0.1 mm and 0.9 mm. Preferably, the thickness of the functional section 6a of the coating 6 is the same at all points along the coating 6.

[0045] Likewise, the first subsection 6b of the coating 6 has a thickness that is less than or equal to, but preferably equal to, the thickness of the functional section 6a, and therefore can also be between 0.1 mm and 0.9 mm. The same can apply to the second subsection 6c and / or the third subsection 6d of the coating 6, or to all further subsections.

[0046] The second section 6c of the coating 6 shown, which is formed separately from the first section 6b in a sprue cavity during the injection molding process of the coating 6, is preferably formed along the outer surface 3 on an opposite area of ​​the coating 6. This results in an improved surface finish of the coating 6, in particular of the functional section 6a of the coating 6.

[0047] The following is an example of an injection molding process based on the Fig. 3a to Fig. 3D explained in more detail. For clarity, the figures only show the section of cover plate 1 indicated by the dashed line. Fig. 2 is shown.

[0048] The injection molding process comprises several steps, the sequence of which does not necessarily have to follow the order described here. Where logically feasible, the steps can also be performed in a different order.

[0049] In one step, see Fig. 3a, an injection mold is provided for forming a first cavity 10. A cavity is defined as a largely enclosed hollow space into which injection molding material can be injected. The required tightness of the cavity 10 depends on the material being injected. For example, thermoplastic materials such as PC (polycarbonate), PMMA (polymethyl methacrylate), or ABS (acrylonitrile butadiene styrene) allow for a lower tightness of the cavity at the edges due to their comparatively high viscosity, which, for example, enables mold venting.

[0050] The first cavity 10 is filled with a suitable injection molding material to create a transparent body 4. Thus, the first cavity 10 determines the shape of the transparent body 4, which is formed by injection molding in the first cavity 10 and after the injected injection molding material has cured. Possible materials for the transparent body 4 have already been mentioned.

[0051] In a further step, see Fig. 3b, an injection mold is provided for forming a second cavity 20. The second cavity 20 determines the shape of the opaque body 5, which is created by injection molding in the second cavity 20 and after the injected injection molding material has cured. Possible materials for the opaque body 5 have already been mentioned.

[0052] In the arrangement shown, the second cavity 20 is partially bounded by the transparent body 4. A version of the injection molding process in which the opaque body 5 is injection molded first, followed by the transparent body 4, is also possible. In this case, the opaque body 5 would partially bound the first cavity 10. It is essential that the transparent body 4 and the opaque body 5 are joined together in one piece during the injection molding process.

[0053] In a further step, see Fig. In section 3c, an injection mold 100 is provided for forming a flood cavity 30. The flood cavity 30 determines the shape of the coating 6, which is created by injection molding into the flood cavity 30 and after the injected coating material has cured. Although the term "injection molding" is used here in connection with the coating material, which is polyurethane (PU), this process can also be referred to as "flooding." As already mentioned, the coating material can be introduced into the flood cavity 30 by a low-pressure injection molding process, such as reaction injection molding. The flood cavity 30 is partially bounded by the transparent body 4 and partially by the opaque body 5, so that after the coating 6 is injected into the flood cavity 30, the transparent body 4, the opaque body, and the coating 6 are integrally bonded.Additionally, the flood cavity 30 is bounded by the second mold half 120 of the injection mold 100, wherein the first mold half 110 of the injection mold 100 carries the opaque body 5 and the integrally connected transparent body 4. The transparent body 4 and the integrally connected opaque body 5 can together be referred to as the injection-molded cover plate blank 40, which is thus carried by or received by the first mold half 110. The flood cavity 30 is preferably sealed at least largely airtight.

[0054] Between the first tool half 110 and the second tool half 120, a flood cavity 30 can be formed in the closed form of the injection mold 100, as shown, which flood cavity 30 is partially bounded by the second tool half 120, partially by the transparent body 4 and partially by the opaque body 5 of the cover disc blank 40 which can be received by the first tool half 110.

[0055] The opaque body 5 partially delimits an overflow cavity 31. This overflow cavity 31 is part of the flood cavity 30, thus extending the portion of the flood cavity 30 that is only delimited by the transparent body 4 and the second tool half 120 by this overflow cavity 31. Therefore, apart from its connection to the rest of the flood cavity 30, the overflow cavity 31 is delimited only by the opaque body 5 and the second tool half 120.

[0056] Thus, the flood cavity 30 has at least one overflow cavity 31, which overflow cavity 31 is designed to receive air located in the flood cavity 30 when it is displaced and possibly compressed by injecting coating material into the flood cavity 30.

[0057] The provision of cavities 10, 20, and 30 can be achieved, for example, using well-known multi-component injection molding processes. Rotary platen or rotary platen mechanisms are suitable options here, without any limitations.

[0058] The coating 6 is now formed by injecting a coating material into the flood cavity 30. During the injection process, the air in the flood cavity 30 is displaced by the coating material into the overflow cavity 31 and compressed there if necessary. Part of the overflow cavity 31 is filled with the coating material. This part will subsequently form the first section 6b of the coating 6. With reference to Fig. 1. It should be noted that projections of the boundaries of the overflow cavities are indicated by dashed lines around the first subsection 6b and the third subsection 6d.

[0059] Preferably, the flood cavity 30 is filled with the coating material against gravity to achieve an improved surface finish of the coating 6. For this purpose, the provided injection mold can be designed or rotated to form the flood cavity 30.

[0060] The injection mold 100 has at least one gate point (not shown) for forming the coating 6 in the flood cavity 30, from which a flow path of the coating material originates during the injection molding process. A "gate point" can also be understood as a gate area or gate film. This gate point preferably opens into the aforementioned gate cavity, in which the second section 6c of the coating 6 can be formed. An improved surface finish of the coating 6, in particular of the usable section 6a of the coating 6, is also achieved by arranging the overflow cavity 31 in the closed form of the mold halves 110, 120 opposite this flow path and essentially at the point furthest away from the gate point.If the injection mold 100 is additionally designed so that the flood cavity 30 can be filled with the coating material against gravity, an optimal surface finish of the coating 6, in particular of the usable section 6a, is achieved.

[0061] The volume of the overflow cavity 31 depends on factors such as injection pressure, coating material, and the shape of the coating 6. The volume of the overflow cavity 31 is preferably selected such that it can accommodate all the air present in the flood cavity 30 during the injection process, optionally in compressed form. If several overflow cavities are provided, the possible volume refers to the total volume of all overflow cavities.

[0062] In a further, preferably final, step, see Fig. In step 3D, the cover plate 1 is demolded. For this purpose, the first tool half 110 and the second tool half 120 are separated and the cover plate 1 is ejected. The cover plate 1, comprising the opaque body 5, the transparent body 4 and the coating 6, can then be joined to a housing 7, for example by gluing, if required.

[0063] Fig. Figure 4 shows the cover plate 1 in a suitable application in a motor vehicle light 8, wherein the cover plate 1 is connected to a housing 7, thereby protecting the inner surface 2 of the cover plate 1 from one, several, or all of the aforementioned external influences. Lighting modules, in particular LED lighting modules, can be arranged inside the motor vehicle light.

[0064] Fig.Figure 5 shows a motor vehicle 9 in which such a motor vehicle light 8 is installed. Such a motor vehicle light 8 can be, for example, a rear light, fog light, signal light or radiator grille lighting device.

[0065] The invention is not limited to the embodiments shown, but is defined by the entire scope of protection of the claims. Individual aspects of the invention or the embodiments may also be adopted and combined. Any reference numerals in the claims are exemplary and serve only to improve the readability of the claims, without limiting them. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] EP 3878620A1

[0003] Cited non-patent literature

[0000] DIN EN ISO 20567-1, e.g. v2017-07 [0013, 0030] DIN EN ISO 13803 [0013, 0030] DIN EN ISO 20566

[0013] DIN EN ISO 20566, e.g. v2021-06

[0030]

Claims

[1] Cover plate (1) for a motor vehicle lamp (8), wherein the cover plate (1) an interior surface (2), an outer surface (3) opposite the inner surface (2), a transparent body (4), an opaque body (5) and a coating (6) wherein the coating (6) is PU polyurethane, characterized by , that the transparent body (4), the opaque body (5) and the coating (6) are manufactured in such a single piece, preferably using an injection molding process, that the outer surface (3) is formed exclusively on the coating (6) and on the opaque body (5), wherein the coating (6) as seen from the outer surface (3) towards the inner surface (2) completely covers the transparent body (4) and only partially covers the opaque body (5), wherein the area of ​​the coating (6) that completely covers the transparent body (4) forms a usable section (6a) of the coating and wherein the area of ​​the coating (6) that only partially covers the opaque body (5) forms at least a first subsection (6b) of the coating (6), which first subsection (6b) is formed at least partially in an overflow cavity (31) in the injection process of the coating (6). [2] Cover plate (1) according to claim 1, wherein the usable section (6a) of the coating (6) has a thickness between 0.1 mm and 0.9 mm as seen from the outer surface (3) towards the inner surface (2). [3] Cover plate (1) according to one of the preceding claims, wherein the first partial section (6b) of the coating (6) has a thickness which is less than or equal to, preferably equal to, the thickness of the functional section (6a) of the coating (6). [4] Cover plate (1) according to one of the preceding claims, wherein the area of ​​the coating (6) which only partially covers the opaque body (5) additionally forms a second subsection (6c), which second subsection (6c) is formed separately from the first subsection (6b) in a sprue cavity in the injection process of the coating (6). [5] Cover plate (1) according to claim 4, wherein the second subsection (6c) is formed along the outer surface (3) substantially on an opposite area of ​​the coating (6). [6] Cover plate (1) according to one of the preceding claims, wherein the opaque body (5) comprises a material which is resistant to at least one external influence selected from a group of external influences, which group includes influences from adverse weather conditions, mechanical influences, influences from solar radiation or influences from chemicals. [7] Injection mold (100) for producing a cover lens (1) for a motor vehicle lamp, wherein the injection mold (100) comprising a first tool half (110) and a second tool half (120), wherein the first tool half (110) is configured to receive an injection-molded cover plate blank (40), which cover plate blank (40) has a transparent body (4) and an opaque body (5) integrally connected to it, wherein a flood cavity (30) can be formed in a closed form between the first tool half (110) and the second tool half (120), which flood cavity (30) is partially bounded by the second tool half (120), partially by the transparent body (4) and partially by the opaque body (5) of the cover disc blank (40) which can be received by the first tool half (110), wherein the flood cavity (30) has at least one overflow cavity (31) which overflow cavity (31) is designed to receive air contained in the flood cavity (30) when it is displaced by injecting coating material into the flood cavity (30), wherein at least one overflow cavity (31) is partially bounded by the second tool half (120) and partially by the opaque body (5) of the cover disc blank (40) which can be received by the first tool half (110). [8] Injection mold (100) according to claim 7, wherein the at least one overflow cavity (31) in closed form of the mold halves (110, 120) is arranged in the opposite direction to a flow path of the coating material during injection and with respect to a gate point of the coating material from which the flow path originates, substantially at the most distant point. [9] Motor vehicle light (8) with a cover lens (1) according to one of claims 1 to 6. [10] Motor vehicle (9) with a motor vehicle light (8) according to claim 9.

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