Method for producing an illuminable composite pane

Abstract

The present invention relates to a method for producing an illuminable composite pane (10) having a first pane edge (10.1), a second pane edge (10.2), and two lateral pane edges, at least comprising the following steps in the specified sequence: a) providing a planar base pane (2) having a first surface (2.1) and a second surface (2.2); b) introducing an engraving (4) in the planar base pane (2) by means of a laser method; c) heating and bending the planar base pane (2) to form a first bent pane (1) having a first surface and a second surface; d) providing at least one thermoplastic intermediate layer (3) and a second bent pane (5); e) forming a stacking sequence in which the at least one thermoplastic intermediate layer is arranged between the first bent pane (1) and the second bent pane (5); f) laminating the stack sequence; and g) arranging a light source in or on the first bent pane (1).

Description

[0001] Method for producing an illuminable composite pane

[0002] The invention relates to a method for producing an illuminable composite pane and to such an illuminable composite pane.

[0003] Laminated glass is used as glazing for motor vehicles and typically has a bend. To create such a bend, a glass pane that is initially flat is heated to at least its softening temperature. The glass pane is then deformed. Various bending processes are common, such as gravity bending, press bending, or suction bending.

[0004] Motor vehicles have a light distribution system in their interior that provides subtle or striking illumination, depending on requirements. This lighting not only provides orientation within the vehicle but also creates a pleasant atmosphere for passengers. Laminated glass, consisting of two or more glass or polymer panes, is used in vehicles as windshields, rear windows, side windows, and roof windows. In illuminable or illuminated glazing, light from a light source is coupled into a flat light guide in the form of a pane of the glazing using total internal reflection.

[0005] Illuminated glazing can be found in a wide variety of applications inside and outside buildings, furniture, and vehicles. In contrast to a point light source, such as a ceiling light, illuminated glazing can create very uniform, flat ambient light and lighting effects. WO 2010 / 049638 A1 or WO 2013 / 053629 A1 disclose the coupling of light into a glass pane via a side surface. If the light source is placed very close to the edge of the glass, light can be coupled into the light guide very efficiently and across the entire width of the light guide. This makes it possible to achieve very homogeneous, flat illumination. WO 2013 / 110885 A1, WO 2018 / 178591 A1, or WO 2019 / 105855 A1 disclose arranging the light source in a recess and thereby coupling the light into the pane. Alternatively, the light source can be arranged on a surface of the glass pane.The light source is typically an LED, an LED module or an LED strip.

[0006] Light reflectors or light extraction devices are mounted on the pane to emit light from the pane. The pane has a reflective or light-refracting print on one surface of the pane. The light extraction device can also be incorporated into the surface of the pane as a structure through laser structuring or mechanical structuring such as sandblasting. The use of laser pulses can lead to overheating, which then creates stress cracks. There is a need for improved, efficient manufacturing processes for illuminable composite panes.

[0007] It is desirable to create an illuminable composite pane with good light extraction, in which the light extraction means from outside the composite pane is almost invisible to the human eye and enables particularly efficient illumination of the composite pane.

[0008] The invention is based on the object of creating a method for producing an illuminable composite pane in which a light coupling means from outside the unilluminated composite pane is almost invisible to the human eye and enables particularly efficient illumination in the illuminated state of the composite pane.

[0009] The object of the present invention is achieved by a method according to claim 1. Preferred embodiments are evident from the subclaims.

[0010] The method according to the invention for producing an illuminable composite pane with a first pane edge, a second pane edge and two lateral pane edges comprises at least the following steps in the specified order: a) providing a flat base pane with a first surface and a second surface, b) introducing an engraving into the flat base pane by means of a laser process, c) heating and bending the flat base pane to form a first curved pane with a first surface and a second surface, d) providing at least one thermoplastic intermediate layer and a second curved pane, e) forming a stacking sequence in which the at least one thermoplastic intermediate layer is arranged between the first curved pane and the second curved pane, f) lamination of the stacking sequence, and g) arranging a light source in or on the first curved pane.The flat base disc has a first surface, a second surface, and a circumferential edge extending therebetween. The first curved disc has the first surface, the second surface, the first disc edge, the second disc edge, and two lateral disc edges.

[0011] Engraving before bending leads to minor damage and stresses inside the glass of the final product. During bending, these minor damages and stresses are at least partially healed and thus reduced by the heat process. Surprisingly, it was found that the specified sequence of the process steps according to the invention leads to a reduction in defects and breakages in the first pane.

[0012] The first curved pane produced in step c) can advantageously be used to produce an illuminable composite pane. After heating and bending, at least one thermoplastic intermediate layer and a second curved pane are provided. A stacking sequence in which the at least one thermoplastic intermediate layer is arranged between the first curved pane and the second pane is formed, and the stacking sequence is laminated.

[0013] In a preferred embodiment of the method according to the invention, a laser beam is used to create the engraving, which is focused below the first surface or below the second surface of the flat base plate. If the laser beam is focused below a surface of the flat base plate, this means, within the meaning of the invention, that the laser beam is focused on an area between the first surface and the second surface of the flat base plate. The engraving is preferably created between the first surface and the second surface. A laser beam is directed onto the surface of the flat base plate. The laser beam penetrates the flat base plate to a predetermined depth. The laser beam can be focused at a point within the flat base plate, so that a material change is created as an engraving at the focused point.The size, geometry, depth, and position of the engraving can be customized to the requirements of the individual case or design. The engraving is positioned within the flat base plate, thus protecting it from environmental influences such as moisture and corrosion.

[0014] Particularly preferably, the engraving is implemented as an internal engraving of the flat base plate and applied in a single layer, with the thickness of this layer being 10% to 30% of the total thickness of the flat base plate. The engraving is intended to couple light out of the first plate. Advantageously, the engraving is virtually invisible to the human eye from outside the flat base plate when unlit. The engraving is applied by laser below the first surface of the flat base plate without impairing either surface.

[0015] The engraving can be executed as a regular or irregular pattern. The pattern can vary greatly in size, geometry, and arrangement. The engraving can be designed in sections as a dot matrix or linear. Optionally, the engraving can be designed, at least in sections, as a dot matrix, striped matrix, or checkered matrix. Alternatively or additionally, the engraving can also have a gradient, for example, from a high dot density to a low dot density. It is also possible to specifically adjust the engraving gradient across the thickness of the base disc.

[0016] In a further embodiment, the second curved pane can have an engraving. The engraving is preferably embodied as an internal engraving and applied in a layer, the thickness of this layer being 10% to 30% of the total thickness of the second pane. This engraving can also be provided for coupling light out of the second pane. The engraving of the second pane can be designed in sections as a dot matrix or linear. Optionally, the engraving can be designed, at least in sections, as a dot matrix, striped matrix, or checkered matrix. Alternatively or additionally, the engraving can also have a gradient, for example from a high dot density to a low dot density.

[0017] Advantageously, a nano- and / or pico-pulsed green and / or UV laser is used in the laser process for creating the engraving in the flat base disc or in the second disc. The laser is preferably guided across the flat base disc at a speed of 0.1 m / s to 50 m / s. It can preferably have a pulse energy of 20 pJ to 400 pJ, particularly preferably 200 pJ (microjoules).

[0018] Such a laser process enables precise engraving and has no influence on the quality of the final product. The size of the engraving can be influenced by the lens type used, the irradiation time, the power and wavelength of the laser. The engraving is applied before the flat base plate is heated and bent in order to compensate for unwanted defects, stresses and imperfections during heating of the base plate. The first plate preferably contains flat glass, float glass, quartz glass, borosilicate glass, soda-lime glass and / or mixtures thereof. It is understood that the flat base plate therefore also preferably contains flat glass, float glass, quartz glass, borosilicate glass, soda-lime glass and / or mixtures thereof. In particular, at least the first plate and preferably also the second plate are made of clear glass.

[0019] In an exemplary embodiment, the second curved pane can be made of glass, carbon fiber reinforced plastic (CFRP), polycarbonate, or metal. The second pane preferably contains flat glass, float glass, quartz glass, borosilicate glass, soda-lime glass, and / or mixtures thereof. For this purpose, the second pane and / or the intermediate layer can be tinted or colored, for example.

[0020] The thickness of the first disc can vary widely and be adapted to the requirements of the individual case. The first disc preferably has a thickness of 0.1 mm to 2.1 mm, particularly preferably 1.1 mm to 1.9 mm. This also applies to the flat base disc.

[0021] The first curved sheet and / or the second curved sheet may have suitable coatings, for example, an anti-reflective coating, a non-stick coating, an anti-scratch coating, a photocatalytic coating, a sunscreen coating, and / or a low-E coating. Preferably, the first sheet and / or the second sheet are arranged in the stacking sequence so that the coating faces the thermoplastic intermediate layer.

[0022] Advantageous coatings are transparent. A coating, in particular a pane of glass or an object, is considered transparent if the coating, pane of glass, or object has a transmission in the visible spectral range of greater than 20%, preferably 50%, particularly preferably greater than 70%, in particular greater than 85%. However, for panes that are not in the driver's traffic-relevant field of vision, such as roof windows, the transmission can also be much lower, for example, greater than 5%.

[0023] The coating of the first pane or the second pane to produce an illuminable composite pane can be performed before or after heating and bending. In an advantageous embodiment of a method according to the invention, the light source is suitable for emitting visible light. Alternatively, it can emit infrared or ultraviolet light.

[0024] In a preferred embodiment of the method according to the invention, the light source comprises at least one light-emitting diode (LED), preferably at least one organic light-emitting diode (OLED), at least one laser diode, or laser. The light source can also comprise multiple light-emitting diodes, for example, an LED lamp, LED strip, or LED string.

[0025] The light source can be connected to one of the surfaces, a disc edge and / or the lateral disc edges of the first disc via a light coupling means, so that light from the light source can be coupled into the first disc.

[0026] The thermoplastic intermediate layer may comprise a functional layer, in particular an infrared radiation-reflecting layer, an infrared radiation-absorbing layer, a UV radiation-absorbing layer, a layer that is colored at least in sections and / or a layer that is tinted at least in sections.

[0027] When forming the stacking sequence, an electronically controllable optical element, in particular as a liquid crystal element, PDLC element (polymer dispersed liquid crystal), SPD element or electrochromic element, can be arranged between the first disc and the second curved disc.

[0028] During heating, the flat base sheet is heated to its softening temperature. Suitable bending processes for bending the flat base sheet into the first sheet and / or second sheet are known to those skilled in the art. Typical temperatures for glass bending processes are, for example, 500°C to 700°C. The shape of the base sheet can be changed during bending.

[0029] Lamination is preferably carried out under the influence of heat, vacuum, and / or pressure. Known lamination processes can be used, for example, autoclave processes, vacuum bag processes, vacuum ring processes, calender processes, vacuum laminators, or combinations thereof.

[0030] The inventive method for producing an illuminable composite pane combines time-saving engraving prior to bending with high optical efficiency in light extraction from the composite pane. The invention also relates to an illuminable composite pane produced by a method according to the invention, wherein an engraving is provided for coupling out light from the first pane.

[0031] The invention thus also relates to an illuminable composite pane having a first pane edge, a second pane edge, and two lateral pane edges. The illuminable composite pane comprises a first curved pane, at least one thermoplastic intermediate layer, and a second curved pane, wherein the first curved pane is connected to the second curved pane via the at least one thermoplastic intermediate layer. The first curved pane has an engraving, wherein the engraving is intended for coupling light out of the first pane and was introduced by means of a laser process before heating and bending a flat base pane.

[0032] An illuminable composite pane produced by a method according to the invention can additionally comprise a cover print, in particular made of a dark, preferably black, enamel. The cover print is in particular a peripheral, i.e. frame-like, cover print. The peripheral cover print serves primarily as UV protection for the assembly adhesive of the composite pane. The cover print can be opaque and cover the entire surface. The cover print can also be semi-transparent, at least in sections, for example as a dot matrix, striped matrix or checkered matrix. Alternatively, the cover print can also have a gradient, for example from an opaque covering to a semi-transparent covering.

[0033] The masking print can be applied to the illuminable composite pane via the first pane and / or via the second curved pane. To apply the masking print, a printing ink suitable for masking prints is applied to certain areas of the respective pane before the pane is heated and bent. Thus, the masking print can be applied to the first pane or the second pane. In a further embodiment, a masking print is applied to both the first pane and the second pane.

[0034] The cover print is preferably arranged on a surface of the second pane. If the second pane is the outer pane of the illuminable composite pane, the cover print is preferably arranged on the surface facing the thermoplastic intermediate layer. If the second curved pane is the inner pane of the illuminable composite pane, the cover print is preferably arranged on the surface not facing the thermoplastic intermediate layer.

[0035] If the composite pane is intended to separate the interior of a vehicle window from the exterior, the inner pane within the meaning of the invention refers to the pane of the composite pane facing the vehicle interior. The outer pane refers to the pane facing the exterior.

[0036] In a preferred embodiment of the illuminable composite pane according to the invention, the composite pane is a roof pane of a motor vehicle and the first curved pane is the inner pane and the second pane is the outer pane.

[0037] In an advantageous embodiment of the illuminable composite pane according to the invention, the engraving is suitable for coupling out a part of the light guided in the first pane, preferably by scattering, reflection, refraction or diffraction, via at least one of the surfaces of the first pane.

[0038] The first disc can be curved in one or more spatial directions, with typical radii of curvature ranging from approximately 10 cm to approximately 40 m. Complex curved discs can be spherically, conically, and / or parabolically curved, with radii of curvature then in the range of approximately 4 mm. Such complex disc geometries exhibit, for example, local areas of strong curvature (small radii of curvature) and / or strong curvature changes (high curvature gradients).

[0039] The second curved disc can be curved in one or more directions of the room, with typical radii of curvature ranging from about 10 cm to about 40 m.

[0040] Radii of curvature for the illuminable composite pane are therefore also in the range of about 10 cm to about 40 m.

[0041] The at least one thermoplastic intermediate layer preferably contains or consists of at least polyvinyl butyral (PVB), ethylene vinyl acetate (EVA), polyurethane (PU) or copolymers or derivatives thereof, particularly preferably polyvinyl butyral (PVB) and additives known to the person skilled in the art, such as plasticizers.

[0042] The at least one thermoplastic intermediate layer can be formed by a single film or by more than one film.

[0043] The thickness of the at least one thermoplastic intermediate layer is preferably between 30 pm and 1500 pm, preferably between 50 pm and 780 pm, and is, for example, 380 pm or 760 pm. The at least one thermoplastic intermediate layer can have a constant thickness or a wedge-shaped cross-section.

[0044] The invention also relates to the use of an illuminable composite pane according to the invention as building glazing or vehicle glazing, preferably as vehicle glazing, in particular as a roof pane, windscreen or built-in part of a motor vehicle and as a functional individual piece, and as a built-in part in furniture, appliances and buildings.

[0045] It goes without saying that the features and the advantages that can be achieved thereby, which have been described with reference to the method according to the invention, are applicable or transferable to the composite pane according to the invention and vice versa.

[0046] The invention is explained in more detail below with reference to figures and exemplary embodiments. The figures are schematic representations and not to scale. The figures do not limit the invention in any way.

[0047] They show:

[0048] Figure 1 is a flow diagram of an embodiment of a method according to the invention for producing an illuminable composite pane 10,

[0049] Figure 2 is a plan view of a flat base plate 2,

[0050] Figure 3 shows a cross section through the flat base plate 2 shown in Figure 2 along the section line AA',

[0051] Figure 4 shows a cross-section through a flat base plate 2, in which an engraving 4 is applied by means of a laser beam 6,

[0052] Figure 5 shows a cross section through a first curved disc 1 with engraving 4,

[0053] Figure 6 shows a cross section through an illuminated first curved disc 1 with engraving

[0054] 4, and Figure 7 shows a cross section of an illuminable composite pane 10 according to the invention.

[0055] Figure 1 shows a flow diagram of an embodiment of a method according to the invention for producing an illuminable composite pane 10. The illuminable composite pane 10 has a first pane edge 10.1, a second pane edge 10.2 and two lateral pane edges.

[0056] In a first step S1, a flat base plate 2 is provided with a first surface 2.1 and a second surface 2.2 and a circumferential edge running therebetween.

[0057] In a second step S2, an engraving 4, for example an internal engraving, is introduced into the flat base plate 2 by means of a laser process.

[0058] In a third step S3, the flat base plate 2 is heated and bent into a first curved plate 1 with a first surface 1.1 and a second surface 1.2. The engraving leads to minor damage in the glass interior of the flat base plate 2. During heating and bending, this minor damage is at least partially healed and thus reduced by the heating process. The flat base plate 2 is heated to its softening temperature. Heating the flat base plate 2 may be sufficient to repair or at least minimize the damage and stresses in the base plate 2 caused by the laser process.

[0059] In a fourth step S4, at least one thermoplastic intermediate layer 3 and a second curved disc 5 are provided.

[0060] In a fifth step S5, a stacking sequence is formed in which the at least one thermoplastic intermediate layer 3 is arranged between the first curved disc 1 and the second curved disc 5.

[0061] In a sixth step S6, the stack sequence is laminated.

[0062] In a seventh step S7, a light source is arranged in or on the curved first pane 1. Figure 2 shows a plan view of a flat base pane 2. The flat base pane 2 is plate-shaped. The flat base pane 2 is made of soda-lime glass, for example, and has a thickness of 1.6 mm, for example.

[0063] Figure 3 shows a cross-section through the flat base plate 2 shown in Figure 2 along the section line AA'. The flat base plate 2 has a first surface 2.1 and a second surface 2.2.

[0064] Figure 4 shows a cross-section through a flat base plate 2. An engraving 4 is applied to the base plate 2 using a laser beam 6. The engraving 4 is designed as an internal engraving. The base plate 2 is provided with several engravings 4. Each engraving 4 can comprise several internal engraving points. The internal engraving points can be formed along a line within the base plate 2. The internal engraving points can be applied continuously or discontinuously along the line.

[0065] The laser beam 6 is used to create the engraving 4. The laser beam 6 is generated in a laser device (not shown). The laser beam 6 can be deflected by optical means, for example, one or more mirrors. The laser beam 6 strikes the first surface 2.1 of the base plate 2 via a focusing optics 7. The focusing optics 7 focuses the laser beam 6 below the surface 2.1 of the base plate 2. The engraving 4 is created in a layer, the thickness of which can be 10% to 30% of the total thickness of the flat base plate 2.

[0066] Figure 5 shows a cross-section through a first curved pane 1 with engraving 4, as the first curved pane 1 appears after the third step 3 of the inventive method for producing an illuminable composite pane 10. The first curved pane 1 has a first surface 1.1 and a second surface 1.2. The curved pane 1 shown in Figure 5 differs from the flat base pane 2 shown in Figure 4 only in that it is curved.

[0067] Figure 6 shows a cross-section through an illuminated first curved pane 1 with engraving 4. The first curved pane 1 comprises a light source 8, for example a light-emitting diode (LED), which emits light in the visible range, for example. A light beam 9 of the light source 8 is directed in the direction of the first pane 1 and essentially strikes a pane edge of the first pane 1. Alternatively, several light sources 8 can be arranged on the pane. The one light source 8 or the several light sources can also radiate light beams 9 into the first pane 1 via a surface of the first pane 1 and / or be arranged within a recess in the first pane 1.

[0068] A light coupling means can be arranged between the light source 8 and the first pane 1, which couples a large part of the light from the light source 9 into the first pane 1 by scattering, reflection, refraction or diffraction. The engraving 4 is arranged in the first pane 1 as a light coupling means. The engraving 4 can be arranged at any desired location within the pane 1 and is in particular arranged offset from the light coupling means. The light rays 9 emitted by the light source 8 into the first pane 1 are refracted at the engraving 4 such that they exit the first pane 1 via the first surface 1.1 or via the second surface 1.2.

[0069] Figure 7 shows a cross-section of an illuminable composite pane 10 according to the invention. The composite pane comprises the first curved pane 1, a thermoplastic intermediate layer 3, and a second curved pane 5. The first pane 1 is bonded to the second pane 5 via the intermediate layer 3 by lamination, for example, in an autoclave. The intermediate layer 3 is firmly bonded on one side to a surface of the first pane 1 and on the opposite side to a surface of the second pane 5.

[0070] The dimensions of the composite pane 10 are, for example, 1.6 m x 1.5 m. The first pane 1 is intended, for example, to face the interior of a vehicle in the installed position. This means that one surface of the first pane 1 is accessible from the interior, whereas one surface of the second pane 5 faces outwards with respect to the vehicle interior. The first pane 1 and the second pane 5 are made, for example, of soda-lime glass. The thickness of the first pane 1 is, for example, 1.6 mm and the thickness of the second pane 5 is, for example, 2.1 mm. It is understood that the first pane 1 and the second pane 5 can have any desired thickness and can, for example, be the same thickness. The intermediate layer 3 is preferably made of an acoustically dampening 3-layer PVB film. The first pane 1, the second pane 5 and the intermediate layer 3 are, for example, clear, i.e., neither tinted nor colored.

[0071] The composite pane 10 shown in Figure 7 is particularly well-suited for glazing, in particular as a roof pane of a motor vehicle. Surprisingly, it has been shown that such a composite pane 10 produced according to a method according to the invention exhibits improved light extraction efficiency compared to previously known composite panes. The engraving, as a light extraction element, is visually unnoticeable to an observer when the composite pane is not illuminated and is incorporated into the first pane in a non-destructive manner.

[0072] List of reference symbols:

[0073] 1 first curved disc

[0074] 1.1 first surface of the first curved disc

[0075] 1.2 second surface of the first curved disc

[0076] 2 flat base plates

[0077] 2.1 first surface of the flat base plate

[0078] 2.2 second surface of the flat base plate

[0079] 3 Intermediate layer

[0080] 4 Engraving

[0081] 5 second curved disc

[0082] 6 laser beam

[0083] 7 Focusing optics

[0084] 8 Light source

[0085] 9 Light beam

[0086] 10 Composite pane

[0087] 10.1 first disc edge

[0088] 10.2 second disc edge

[0089] S1 first step

[0090] S2 second step

[0091] S3 third step

[0092] S4 fourth step

[0093] S5 fifth step

[0094] S6 sixth step

[0095] S7 seventh step

Claims

Patent claims 1. A method for producing an illuminable composite pane (10) with a first pane edge (10.1), a second pane edge (10.2) and two lateral pane edges, at least comprising the following steps in the specified order: a) providing a flat base pane (2) with a first surface (2.1) and a second surface (2.2), b) introducing an engraving (4) into the flat base pane (2) by means of a laser process, c) heating and bending the flat base pane (2) to form a first curved pane (1) with a first surface (1.1) and a second surface (1.2), d) providing at least one thermoplastic intermediate layer (3) and a second curved disc (5), e) forming a stacking sequence in which the at least one thermoplastic intermediate layer is arranged between the first curved disc (1) and the second curved disc (5), f) laminating the stacking sequence, and g) arranging a light source in or on the first curved disc (1).

2. Method according to claim 1, wherein a laser beam is used for introducing the engraving (4), which is focused below the first surface (2.1) of the flat base plate (2).

3. Method according to claim 1 or 2, wherein the engraving (4) is introduced between the first surface (2.1) and the second surface (2.2).

4. Method according to claim 3, wherein the engraving (4) is carried out as an internal engraving and is introduced in a layer, the thickness of this layer being 10% to 30% of the total thickness of the flat base plate (2).

5. Method according to one of claims 1 to 4, wherein the second disc (5) has a laser engraving.

6. Method according to one of claims 1 to 5, wherein the second pane (5) is made of glass, carbon fiber reinforced plastic (CFRP), polycarbonate or metal.

7. Method according to one of claims 1 to 6, wherein the first curved disc (2) has a thickness of 0.1 mm to 2.1 mm, preferably of 1.1 mm to 1.9 mm.

8. Method according to one of claims 1 to 7, wherein the first pane (1) and / or the second pane (5) has at least one coating, in particular an anti-reflection coating, a non-stick coating, an anti-scratch coating, a photocatalytic coating, a sun protection coating and / or low-E coating.

9. Method according to one of claims 1 to 8, wherein the light source (8) comprises at least one or more light-emitting diodes.

10. The method according to any one of claims 1 to 9, wherein the thermoplastic intermediate layer (3) comprises a functional layer, in particular an infrared radiation reflecting layer, an infrared radiation absorbing layer, a UV radiation absorbing layer, a layer colored at least in sections and / or a layer tinted at least in sections.

11. Method according to one of claims 1 to 10, wherein, during the formation of the stacking sequence, an electronically controllable optical element, in particular a PDLC element or electrochromic element, is arranged between the first curved disc (1) and the second curved disc (5).

12. Illuminable composite pane (10) produced by a method according to one of claims 1 to 11, wherein the engraving (4) is provided for coupling out light from the first curved pane (1).

13. Illuminable composite pane (10) according to claim 12, wherein the composite pane (101) is a roof pane of a motor vehicle and the first, in particular curved pane (1) is the inner pane and the second pane (5) is the outer pane.

14. Use of an illuminable composite pane (10) according to claim 12 or 13 as building glazing or vehicle glazing, preferably as vehicle glazing, in particular as a roof pane, windscreen or built-in part of a motor vehicle and as a functional individual piece, and as a built-in part in furniture, appliances and buildings.

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