Vehicle window glass with light source and light guide layer

Abstract

The present invention relates to a vehicle glazing comprising a glazing body assembly having an outer surface facing the vehicle surroundings and an inner surface facing the interior of the vehicle, the glazing having a light guide layer, and a light source (24) configured to couple light into the light guide layer, wherein an input coupling element (28) is provided on the inner surface of the glazing body assembly to couple light emitted by the light source (24) into the light guide layer.

Description

[Technical field]

[0001] The invention relates to a vehicle glazing having the features of the preamble of claim 1 . [Background technology]

[0002] Vehicle glazings of this kind are known from the prior art and can be used in particular in the field of vehicle roofs, where the vehicle glazing can form a fixed roof element or a cover element of a roof opening system, by means of which the roof opening can be closed or opened at will. The known vehicle glazing comprises a glazing body, which can be curved, and is provided with a light guiding layer. Furthermore, the known vehicle glazing is provided with a light source, from which light can be coupled into the light guiding layer. The light is coupled in via an edge of the light guiding layer. The light guiding layer can form a visible surface of the vehicle glazing that is visible from the interior of the vehicle, so that the light guiding layer forms a light element of the vehicle glazing, whereby the interior of the vehicle can be illuminated when the light source is activated. The light guiding layer of the known vehicle glazing has smaller dimensions than the glazing body, on the inside of which the light guiding layer is arranged, so that the light emitted by the light source can be coupled in via an edge of the light guiding layer. Summary of the Invention

[0003] It is an object of the invention to provide a vehicle glazing of the above-mentioned kind, in which the light guiding layer provides an illumination area that is as large as possible.

[0004] According to the invention, this object is achieved by a vehicle glazing having the features of claim 1.

[0005] The invention thus proposes a vehicle glazing, in which the light emitted by the light source can be coupled into the light guide layer over a large surface by means of an in-coupling element arranged inside the assembly of the glazing body. This allows the light guide layer to be adapted to the requirements in an optimized manner in terms of its dimensions, i.e. its footprint. Furthermore, only light with a certain angle of incidence is coupled into the light guide layer. Light rays outside this range are not coupled, so that they do not propagate in the light guide layer. This improves the brightness as well as the uniformity of the light over the surface of the light guide layer. The in-coupling element thus guides the light emitted by the light source into the light guide layer at a defined angle, whereby an improved in-coupling efficiency is achieved.

[0006] The inventive concept, in which the in-coupling element is arranged inside the glazing body assembly, can be fundamentally applied to single-insulated and laminated safety glass.

[0007] If the invention is applied to laminated safety glass, the glazing body assembly comprises an outer glazing body and an inner glazing body which is connected to the outer glazing body via a connecting layer, the inner glazing body preferably forming a light guiding layer, in which case the in-coupling element may be attached directly to the inner side of the inner glazing body.

[0008] Of course, it is also conceivable that an additional light guiding layer, into which the light of the light source may be coupled by means of an in-coupling element, is applied to the inner pane body of the laminated safety glass.

[0009] In the embodiment in which the inner glazing body forms the light guiding layer, no additional costs are incurred for the application of the light guiding layer. Furthermore, the integration of the functions gives advantages in terms of weight and installation space. Thus, the inventive arrangement with the in-coupling element allows a large-scale ambient light function to be provided by the inner glazing body, also for fixed roof elements of motor vehicles, for example.

[0010] The inner glazing body may have the same dimensions as the outer glazing body or may have smaller dimensions than the outer glazing body and may be made of essentially any material that can be used, such as a light guide, for example the inner glazing body may be made of a material comprising glass and / or polycarbonate and / or another type of plastic.

[0011] If the assembly of glazing bodies is laminated safety glass, the connecting layer between the individual glazing bodies is preferably made from a material comprising polyvinyl butyral (PVB), ethylene-vinyl acetate (EVA) and / or thermoplastic polyurethane (TPU). The connecting layer may be clear, i.e. completely transparent, or it may be tinted.

[0012] In a preferred embodiment, the in-coupling element of the vehicle glazing according to the invention is rod-shaped and is preferably arranged near its end on the underside of the glazing body assembly, in which case light can be coupled into the light-guiding layer of the glazing body assembly over the length of the rod-shaped in-coupling element.

[0013] In a particular embodiment of a vehicle glazing according to the invention, two input coupling elements of the type described above may be provided, which are positioned near opposite ends on the underside of the glazing body assembly.

[0014] In a preferred embodiment of the vehicle glazing according to the invention the input coupling element has a wedge-shaped or trapezoidal cross section in order to optimise the in-coupling angle of the light coupled by the input coupling element into the light guiding layer, so that the input coupling element acts as an optical prism.

[0015] The input coupling element is preferably made from a material comprising acrylic resin (PMMA), polycarbonate resin (PC), polyamide (PA), cyclic olefin copolymer (COC) or cycloolefin polymer (COP), where the input coupling element is in particular a rod-shaped plastic member.

[0016] The refractive index of the input coupling element is in particular matched to the refractive index of the adjacent light guiding layer and preferably has a value between 1.40 and 1.65, and in particular between 1.48 and 1.59.

[0017] The input coupling element is preferably manufactured by extrusion or injection molding.

[0018] The input coupling elements may be provided with a reflective coating to enhance internal reflection; the reflective coating may comprise a metal such as aluminium or silver, which may be applied by evaporation or sputtering.

[0019] In an advantageous embodiment of the vehicle glazing according to the invention, an additional deflection structure is arranged between the in-coupling element and the glazing body assembly so as to further improve the in-coupling behavior of the light into the light guiding layer. The additional deflection structure may change the angle of incidence of the light into the light guiding layer by suitable refraction and increase the internal reflection in the light guiding layer. The additional deflection structure may have dimensions of the order of millimeters or of micrometers and may comprise a three-dimensional array or several asymmetric prisms arranged in a line, for example a Fresnel lens array.

[0020] The additional deflection structure may be integral with the input coupling element and may be formed directly during its manufacture, for example in an extrusion or injection molding process. It is also conceivable that the additional deflection structure is a coating on the input coupling element, for example in the form of a separate structured film.

[0021] The input coupling element is preferably attached to the glazing body via an adhesive layer. The adhesive layer may be made of any optically suitable adhesive, which preferably has a refractive index between 1.40 and 1.65, and in particular between 1.48 and 1.56. For example, the adhesive layer is made of a pressure sensitive adhesive, a liquid optically clear adhesive (LOCA), an ethylene-vinyl acetate copolymer (EVA), polyvinyl butyral (PVB), a thermoplastic polyurethane (TPU), an epoxy adhesive or an acrylic adhesive.

[0022] The materials selected preferably have refractive indices that minimize light reflection at the interfaces and optimize in-coupling efficiency under ideal angular conditions.

[0023] The refractive index of the inner pane body made of glass is in particular 1.52, but the refractive index of the coupling element and of the adhesive layer with which the coupling element is connected to the inner pane body may vary as a function of the selected materials. If acrylic resin (PMMA) is used for the coupling element, the refractive index is 1.49. In this case, the adhesive layer has, for example, a refractive index of 1.52. If an coupling element made of polycarbonate is used, the refractive index is, for example, 1.58, but the refractive index of the adhesive used is 1.56. If the coupling element is made of cycloolefin polymer (COP), its refractive index is 1.52. In this case, the adhesive with which the coupling element is connected to the inner pane body also preferably has a value of 1.52.

[0024] In a particular embodiment of the vehicle glazing according to the invention, the in-coupling element is made of a casting resin, which is preferably directly molded by casting onto the assembly of the glazing body. In this case, the light source may be an insert in the casting resin, the light source preferably being an LED bar, i.e. the light source may be sealed in the casting resin.

[0025] The light guide is connected to the light source and may be a rod or a string. The light guide may be arranged on the side of the input coupling element so as to couple the light of the light source into the input coupling element itself. Here the light source is in particular a high-power LED module. For example, the light guide is made of a material comprising polycarbonate resin (PC) and / or acrylic resin (PMMA). The light guide may be integral with the input coupling element.

[0026] The side of the input coupling element facing the light guide may be flat or concave or convex to focus the light.

[0027] To improve the process of coupling the light to the input coupling elements, the light guide may comprise additional output coupling elements that guide the light to be coupled towards the corresponding side of the input coupling elements. The output coupling elements may comprise prints on the light guide, prism structures, dot structures, or co-extruded scattering materials disposed on the light guide. Furthermore, the output coupling elements may be manufactured integrally with the light guide or may be separate structural elements. In addition, a periodicity of the output coupling elements over the length of the light guide is conceivable. Also, the density of the output coupling elements may vary over the length of the light guide to ensure the uniformity of the light over the length of the light guide.

[0028] Parts of the light guide may also be provided with, for example, a reflective coating.

[0029] In an alternative embodiment of the vehicle glazing according to the invention, the light source is arranged directly on the side of the coupling-element, for example the light source is in particular a high-power LED module, but also an LED bar or LED strip with a plurality of LEDs (groups) emitting their light directly onto the coupling-element.

[0030] Furthermore, a cladding element or cover covering the in-coupling element may be arranged on the inner surface of the glazing body assembly. In this embodiment, meeting high optical requirements, the light source and, if applicable, the light guide through which the light is coupled to the in-coupling element may additionally be arranged behind the cover. This cover forms a housing, but may be glued to the glazing body assembly.

[0031] It is also conceivable that the coupling-element is molded onto the glazing body assembly and housed in a moulded section made, for example, from polyurethane foam, in which case a reflective coating on the coupling-element can prevent absorption losses through the moulded section.

[0032] In a particular embodiment of the vehicle glazing according to the invention, the cladding element and / or the mould part presses the input coupling-element towards the glazing body assembly in such a way as to always guarantee an optimal optical transition between the input coupling-element and the inner glazing body assembly, so that the cladding element or the mould part exerts pressure on the input coupling-element and thus ensures that optical contact between the input coupling-element and the glazing body assembly is maintained.

[0033] In a particular embodiment of the vehicle glazing according to the invention, the in-coupling element is optically coupled to the glazing body assembly via a transparent immersion agent for further improving the transition between the in-coupling element and the glazing body assembly. Thus, in this embodiment, a thin layer made of an optical immersion agent, for example a film, is arranged between the in-coupling element and the glazing body assembly. The immersion agent may comprise or may be an oil and / or jelly-like material.

[0034] In a preferred embodiment of the vehicle glazing according to the invention, the immersion agent has a refractive index between 1.47 and 1.59, and in particular between 1.51 and 1.52, which refractive index is adapted to the refractive index of the glass window body of the glazing body assembly.

[0035] The viscosity of the dip may be between 10 and 50,000 centipoise (cP).

[0036] The invention also relates to a vehicle roof comprising a vehicle glazing of the above-described kind.

[0037] Other advantages and advantageous configurations of the subject matter of the invention are apparent from the description, the drawings, and the claims.

[0038] An illustrative example of a vehicle roof with a vehicle glazing according to the invention is shown diagrammatically in the drawing and is discussed in more detail in the following description. [Brief description of the drawings]

[0039] [Figure 1] FIG. 1 is a schematic top view of a vehicle roof having a vehicle glazing according to the invention. [Diagram 2] FIG. 2 is a schematic cross-sectional view through the vehicle glazing of the vehicle roof of FIG. [Diagram 3] FIG. 3 is a cross-sectional view through a second embodiment of a vehicle glazing corresponding to FIG. [Figure 4] FIG. 4 is a cross-sectional view through a third embodiment of a vehicle glazing. [Diagram 5] FIG. 5 is a cross-sectional view through a fourth embodiment of a vehicle glazing. [Figure 6] FIG. 6 is a cross-sectional view through a fifth embodiment of a vehicle glazing. [Figure 7] FIG. 7 is a cross-sectional view through a sixth embodiment of a vehicle glazing. [Figure 8] FIG. 8 is a cross-sectional view through a seventh embodiment of a vehicle glazing. [Figure 9] FIG. 9 is a cross-sectional view through an eighth embodiment of a vehicle glazing. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0040] Figure 1 shows a vehicle roof 10 of a motor vehicle without showing any further details than necessary. The vehicle roof 10 is a panoramic roof with a movable cover element 12 and a fixed roof element 14, which is immovably fixed to the vehicle body. The cover element 12 and the fixed roof element 14 each comprise a glass element which is a vehicle glazing and is configured as laminated safety glass with ambient light function. In this respect, the structure of the cover element 12 corresponds to the structure of the fixed roof element 14. This structure is illustrated in more detail in Figure 2.

[0041] The roof elements 12 and 14 are each vehicle glazings and each comprise a laminated element comprising an outer glazing body 16 and an inner glazing body 18. The outer glazing body 16 is made from a curved glass sheet, which is made, for example, from tinted soda-lime glass. It is also conceivable that the outer glazing body 16 is made from a plastic element, such as a polycarbonate element. The inner glazing body 18 may also be made from an inorganic glass, such as soda-lime glass, or from a polymer, such as polycarbonate. Furthermore, in this context, the inner glazing body 18 forms a light-guiding layer in which the light coupled into its volume propagates.

[0042] The outer glazing body 16 and the inner glazing body 18 are connected via a lamination, i.e. connecting layer 20, which may be made of a material such as polyvinyl butyral (PVB), ethylene-vinyl acetate (EVA) or thermoplastic polyurethane (TPU). Furthermore, the connecting layer 20 may be clear, i.e. completely transparent, or it may be tinted. In this case, the connecting layer 20 has a thickness of 0.76 mm, but may also have a different thickness.

[0043] The outer glass body 16 and the inner glass body 18 each have a thickness of approximately 2.1 mm in this case and form a glass body assembly. The glass body assembly has an outer side which faces the vehicle's surroundings and an inner side which faces the vehicle's interior. On the inner side, the glass body assembly is provided on both sides of a vertical central roof with illuminators 22, by means of which an ambient light function can be realized.

[0044] The irradiators 22 each extend in the longitudinal direction of the vehicle and are arranged on a respective lateral end of the covering element 12 and on a respective lateral end of the fixed roof element 14 .

[0045] Each of the illuminators 22 comprises a light source 24, which comprises an array of LEDs, disposed on an end face of a light guide 26, which is made from a rod or string and comprises, for example, a acrylic (PMMA) material and / or a polycarbonate material. The light guide 26 may be manufactured by extrusion or injection molding.

[0046] Furthermore, each illuminator 22 comprises a rod-shaped in-coupling element 28, which extends over the longitudinal width of the associated illuminator 22 and has in this case a wedge-shaped or triangular cross section. The in-coupling elements 28 thus each form a prism. The latter is preferably made of a plastic material by extrusion or injection molding. In particular, acrylic resin (PMMA), polycarbonate resin (PC), polyamide (PA), cyclic olefin copolymer (COC) and / or cycloolefin polymer (COP) may be used as materials, whose refractive index is between 1.48 and 1.59.

[0047] Each of the input coupling elements 28 is fixed to the window glass body assembly via an adhesive layer 30. The adhesive layer 30 has a refractive index that is of the order of the refractive index of the input coupling elements 28 or between the refractive index of the input coupling elements 28 and the refractive index of the inner window glass body 18, in particular between 1.48 and 1.59. Pressure sensitive adhesives, liquid optically clear adhesives, ethylene-vinyl acetate copolymers (EVA), polyvinyl butyral (PVB), thermoplastic polyurethanes (TPU), epoxy adhesives or acrylic adhesives may be used as materials for the adhesive layer 30.

[0048] The inner window glass body 18 has a refractive index of 1.52.

[0049] Additionally, each illuminator 22 is provided with a cladding element 32 which is also attached to the underside of the glazing body assembly, i.e. the underside of the inner glazing body 18 , and covers the in-coupling element 28 , the light guide 26 and the light source 24 .

[0050] When the light source 24 is activated, the light emitted by the light source 24 is coupled into the light guide 26 and from the light guide to the input coupling element 28. The internal reflection at the interface of the input coupling element 28 couples the light into the inner glazing body 18 through the adhesive layer 30, so that the light can propagate to the inner glazing body 18 by the internal reflection at the interface. Here, the inner glazing body 18 is a light guiding layer. The light can be coupled from the inner glazing body 18 toward the interior of the vehicle through a diffusing element, which the inner glazing body 18 has. For example, a printing that diffuses the light toward the interior of the vehicle is applied to the upper surface of the inner glazing body 18.

[0051] In an alternative embodiment, the light guide 26 and the input coupling-element 28 are integral.

[0052] Figure 3 shows a vehicle glazing 40, which corresponds generally to the vehicle glazing of Figure 2, but differs from that of Figure 2 in that it has a light guide 26' arranged on a widthwise surface of the input coupling element 28 and is provided with an additional output coupling element 42. The additional output coupling element 42 extends over the length of the light guide 26. The output coupling element 42 helps to couple light in the direction from the light guide 26' to the input coupling element 28. The output coupling element 42 can be manufactured integrally with the light guide 26' or can be an additional structure formed by a print, a prism structure, a dot structure or the like.

[0053] In all other respects the vehicle glazing 40 corresponds to the vehicle glazing of FIG.

[0054] Figure 4 shows a vehicle glazing 50, which corresponds substantially to the vehicle glazing of figure 3, but differs in that the input coupling element 28 comprises an additional deflection structure 52 on the surface facing the assembly of glazing bodies, which optimizes the in-coupling of light emitted in the direction of the assembly of glazing bodies and is formed by a lens array, such as a row of asymmetric prisms or a Fresnel lens array, with dimensions of the order of micrometers or of millimeters. The additional deflection structure 52 may be a coating on the input coupling element 28 or may be manufactured integrally with the latter. At its end, the input coupling element 28 is connected via an adhesive strip 54 to the underside of the inner glazing body 18 of the assembly of glazing bodies.

[0055] Otherwise the vehicle glazing 50 corresponds to the vehicle glazing of FIG.

[0056] Figure 5 shows a vehicle glazing 60, which again corresponds generally to the vehicle glazing of Figure 3, but differs in that the vehicle glazing 60 comprises an LED bar 62 as a light source, the LED bar 62 comprising a plurality of LEDs spanning the length of the input coupling element 28 whose light can be directly coupled into the input coupling element 28 via a width surface. The LED bar 62 is connected to the underside of the inner glazing body 18 via a common adhesive layer 30.

[0057] Otherwise the vehicle glazing 60 corresponds to the vehicle glazing of FIG.

[0058] Figure 6 shows a vehicle glazing 70 which corresponds generally to the vehicle glazing of figure 2, but differs in that the illuminators 22, i.e. the light guides 26 and the in-coupling elements 28, are not covered by the housing-like cladding element 32. Instead, these elements are housed in a PU foam 72 which forms a mould section and is bubble injected around or over the edges of the glazing body assembly comprising the outer glazing body 16, the inner glazing body 18 and the connecting layer 20.

[0059] In other respects the vehicle glazing 70 corresponds to the vehicle glazing of FIG.

[0060] Figure 7 shows a vehicle glazing 80, which generally corresponds to the vehicle glazing of Figure 6, but differs in that the input coupling element 28 is connected to the inner window body 18 of the glazing body assembly via an immersion agent 31. The immersion agent 31 forms a thin film between the input coupling element 28 and the inner window body 18, and has a refractive index of 1.51 and a viscosity of approximately 30,000 centipoise (cP). The input coupling element 28 is held on the inner window body 18 by a PU foam 72, which forms a mould section and also presses the input coupling element 28 against the inner window body 18, thus maintaining an optimal optical coupling between the input coupling element 28 and the inner window body 18.

[0061] Otherwise the vehicle glazing 80 with the illuminator 22 corresponds to the vehicle glazing of FIG. 6, the vehicle glazing 80 comprising the in-coupling element 28 and the immersion agent 31 .

[0062] Figure 8 shows a vehicle glazing 90, which corresponds generally to the vehicle glazing of Figure 2, but differs in that a pressure element 92 is arranged between the cladding element 32 and the input coupling element 28, and the cladding element 32 presses the input coupling element 28 in the direction of the inner glazing body 18 by the pressure element 92, so that an optimal optical transition between the input coupling element 28 and the inner glazing body 18 is always ensured.

[0063] In all other respects the vehicle glazing 90 corresponds to the vehicle glazing of FIG.

[0064] Figure 9 shows a vehicle glazing 100, which corresponds substantially to the vehicle glazing of figure 5, but differs in that the vehicle glazing 100 is provided with an illuminator 22 on its underside, the illuminator 22 having an in-coupling element 28, which is made of a casting resin that is moulded directly onto the underside of the inner glazing body 18 of the glazing body assembly. The in-coupling element 28 has an in-coupling part 102 with a triangular or wedge-shaped cross section and is provided integrally with a receiving part 104, where the receiving part 104 receives an LED bar 62 as an insert, which is the light source of the illuminator 22.

[0065] Otherwise the vehicle glazing in FIG. 9 corresponds to the vehicle glazing in FIG. [Explanation of symbols]

[0066] 10 Vehicle roof 12 Cover Elements 14 Fixed roof elements 16 Outer window glass body 18 Inner window glass body 20 Connection Layer 22 Irradiator 24 Light source 26,26' Light guide 28 Input Coupling Elements 30 Adhesive layer 31 Soaking agent 32 Cladding Elements 40 Vehicle window glass 42 Output coupling element 50 Vehicle window glass 52 Additional deflection structure 54 Adhesive Strips 60 Vehicle window glass 62 LED Bar 70 Vehicle window glass 72 PU foam 80 Vehicle window glass 90 Vehicle window glass 92 Pressure Elements 100 Vehicle window glass 102 Input coupling section 104 Storage unit

Claims

1. 1. A vehicle roof comprising a vehicle glazing comprising a glazing body assembly having an exterior surface facing a vehicle periphery and an interior surface facing an interior of the vehicle, the glazing body assembly having a light guiding layer, Illuminators (22) are provided on both sides of a vertical central plane of the vehicle roof parallel to the vehicle longitudinal direction, each of the illuminators (22) extending in the vehicle longitudinal direction and disposed on a widthwise end of the window glass body; Each of the illuminators (22) comprises a light source (24) configured to couple emitted light into the light guide layer, and an input coupling element (28) is provided on the inner surface of the glazing body assembly to couple the light emitted by the light source (24) into the light guide layer; The input coupling element (28) is attached to the glazing body assembly via an adhesive layer (30); the light source is disposed directly on a widthwise surface of the input coupling element (28); the light source is a light emitting diode (LED) bar (62) comprising a plurality of LEDs; The window glass body assembly comprises an outer window glass body (16) and an inner window glass body (18) connected to the outer window glass body (16) via a connecting layer (20); The inner glazing body (18) forms the light guiding layer; the input coupling element (28) is attached to a surface of the inner glazing body (18) facing away from the outer glazing body (16); The adhesive layer (30) is pressure sensitive adhesive and / or liquid optically clear adhesive and / or Adhesives comprising ethylene-vinyl acetate (EVA), polyvinyl butyral (PVB) and / or thermoplastic polyurethane (TPU) and / or The adhesive is an epoxy adhesive and / or an acrylic adhesive. The adhesive layer (30) has a refractive index between 1.40 and 1.65; said input coupling element (28) being made of a material comprising acrylic resin (PMMA), polycarbonate resin (PC), polyamide (PA), cyclic olefin copolymer (COC) and / or cycloolefin polymer (COP) and having a refractive index between 1.40 and 1.65; The inner glazing body (18) has the same area as the outer glazing body (16); the input coupling element (28) comprises a cladding element (32) and / or is housed in a mould section connected to the glazing body assembly; The input coupling element (28) is a member of a material that is transparent to the light of the light source (24) and has a wedge-shaped or trapezoidal cross section. Vehicle roof.

2. The input coupling element (28) is a rod-shaped member of material.

2. The vehicle roof of claim 1.

3. The input coupling element (28) is characterized in that it is provided with an additional deflection structure (52) on its side facing the glazing body assembly.

3. A vehicle roof according to claim 1 or 2.

4. The additional deflection structure (52) is either integral with the input coupling element (28) or is a coating on the input coupling element.

4. The vehicle roof of claim 3.

5. The adhesive layer (30) is characterized by a refractive index between 1.48 and 1.

56. A vehicle roof according to any one of claims 1 to 4.

6. The input coupling element (28) is characterized by a refractive index between 1.48 and 1.

59. A vehicle roof according to any one of claims 1 to 5.

7. characterised in that the outer glazing body (16) is made from inorganic glass and / or polymer glass and / or the inner glazing body (18) is made from inorganic glass and / or polymer glass. A vehicle roof according to any one of claims 1 to 6.

8. the cladding element and / or the mould section urges the input coupling element (28) towards the window glass body assembly such that optical contact between the input coupling element (28) and the window glass body assembly is maintained. A vehicle roof according to any one of claims 1 to 7.

9. The input coupling element (28) is optically coupled to the window glass body assembly via a transparent immersion agent (31). A vehicle roof according to any one of claims 1 to 8.

10. The soaking agent (31) is characterized in that it comprises an oil and / or a jelly-like material.

10. The vehicle roof of claim 9.

11. The immersion agent (31) is characterized in that it has a refractive index between 1.47 and 1.

59.

11. Vehicle roof according to claim 9 or 10.

12. The immersion agent (31) is characterized in that it has a refractive index between 1.51 and 1.

52.

12. The vehicle roof of claim 11.

13. The soaking agent (31) is characterized by a viscosity between 10 and 50,000 centipoise (cP). A vehicle roof according to any one of claims 9-12.

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