Laminated pane with multiple reflective regions

Abstract

The invention relates to a laminated pane (1) for a projection device (100), comprising:-an outer pane (2), a thermoplastic intermediate layer (4) and an inner pane (3),-a partially transparent reflective layer (5), and-an opaque reflective layer (6), the partially transparent reflective layer (5) and the opaque reflective layer (6) being arranged between the outer pane (2) and the inner pane (3), wherein the opaque reflective layer (6) is arranged outside the see-through region (7) of the laminated glass pane (1) and the partially transparent reflective layer (5) extends over at least the entire see-through region (7) of the laminated glass pane (1), the opaque reflective layer (6) reflecting visible light (8) with a degree of at least 30% and the partially transparent reflective layer (5) reflecting visible light (8) with a degree of at most 30%.

Description

[0001] The present invention relates to a laminated glass sheet for a projection device, a production method thereof, a use thereof and a projection device comprising the laminated glass sheet.

[0002] Modern cars are increasingly equipped with so-called head-up displays (HUD). Using a projector (usually located in the instrument panel area), an image is projected onto a see-through area of ​​the windshield, where it is reflected and perceived by the driver as a virtual image behind the windshield (as seen from the driver's position). Important information, such as the current driving speed, navigation information or warnings, can thus be projected into the driver's field of vision, allowing the driver to perceive this information without having to take his or her eyes away from the road. Head-up displays can thus significantly increase traffic safety.

[0003] It is also known to equip the windshield with a reflective layer, which, although it allows viewing through the windshield, still reflects the projector radiation to a large extent. The angle of incidence of the projector radiation on the windshield is usually about 65°, which is close to the Brewster angle of the air-glass transition (56.5° for soda-lime glass). If the projector is operated with S-polarized radiation, the radiation is reflected on the outer surface of the windshield. In this case, an additional reflective layer can be used to amplify the intensity of the displayed image. If the projector is operated with p-polarized radiation, the radiation is basically not reflected on the surface of the glass sheet. In this case, the reflective layer is absolutely necessary for realizing the HUD. For example, a coating with at least one metal layer, in particular a silver layer, can be used as a reflective layer. The windshield is usually composed of an outer glass sheet and an inner glass sheet connected to each other by a thermoplastic interlayer. The coating can be applied, for example, on the surface of the outer glass sheet or the inner glass sheet facing the interlayer or on a PET carrier film embedded in the interlayer. For example, HUDs with p-polarized radiation having a reflective layer are known from DE 10 2014 220 189 A1, WO 2019 046 157 A1 and US 2017 242 247 A1. However, purely dielectric reflective films are also known, which are formed from a plurality of individual layers with alternating high and low refractive indices, wherein the reflective effect is produced by optical interference. Such films can also be embedded in an intermediate layer. For example, a laminated glass pane having such a functional film is known from WO 03 099 553 A1.

[0004] In addition to the transparent see-through area, the windshield usually has an opaque masking area with an opaque layer through which this area cannot be seen through. The masking area is usually arranged in the peripheral edge area of ​​the windshield and adjoins the see-through area. The opaque masking area mainly serves to protect the adhesive used to bond the windshield to the vehicle body from UV radiation. The masking area is usually formed by a black cover print on the surface of the outer glass pane facing the intermediate layer.

[0005] Virtual images can be generated even in masked areas. Therefore, masked areas are also irradiated by the projector and the light is reflected there, thus generating a display for the driver. Thus, for example, information that has previously been displayed in the instrument panel area, such as the time, driving speed, engine speed or navigation system information, or the image of a rear-view camera instead of a conventional exterior mirror or rearview mirror, can be displayed directly on the windshield in a practical and aesthetic way - for example, in the masked area section adjoining the lower edge of the windshield. A projection device of this type is known, for example, from DE 10 2009 020 824 A1. The requirements for the structure of the laminated glass pane for uniform reflection of light in the masked area are different from those in the case of HUD reflection.

[0006] WO 2021 / 213884 A1 discloses a projection device comprising at least two reflection areas in a windshield, wherein the type of light reflection in the reflection areas is designed in different ways. WO 2022 / 073894 A1 discloses a vehicle glass pane for a projection device, wherein a reflective layer is arranged in front of a masking strip in the vehicle interior.

[0007] The object of the present invention is therefore to provide a laminated glass pane for a projection device which can be used both as a component of a conventional HUD projection device and as a component of a projection device with masked areas, wherein both types of projection devices can achieve a uniform reflection.

[0008] This object is achieved according to the invention by a laminated glass pane according to claim 1. Preferred embodiments result from the dependent claims.

[0009] The invention relates to a laminated glass panel for a projection device, comprising an outer glass panel, a thermoplastic interlayer, an inner glass panel, a partially transparent reflective layer and an opaque reflective layer. The thermoplastic interlayer is arranged between the outer glass panel and the inner glass panel. The partially transparent reflective layer and the opaque reflective layer are arranged between the outer glass panel and the inner glass panel. The opaque reflective layer is arranged outside the see-through area of ​​the laminated glass panel. The partially transparent reflective layer extends over at least the entire see-through area of ​​the laminated glass panel.

[0010] The see-through area of ​​a laminated glazing is the area of ​​the laminated glazing that is intended to be seen through. The see-through area is thus free of opaque layers and is at least partially transparent, with a light transmittance of at least 50%, preferably at least 70%. If the laminated glazing is, for example, a windshield, the see-through area is thus the area through which an observer can see the road.

[0011] The degree of reflection of the opaque reflective layer to visible light is at least 30%, while the degree of reflection of the partially transparent reflective layer to visible light is at most 30%. "Reflection" in the sense of the present invention means that the opaque or partially transparent reflective layer reflects the visible light impinging on it. In the sense of the present invention, reflection within a certain percentage range refers to the average reflectivity at a defined angle of incidence of 65°. The opaque reflective layer is particularly provided to reflect the image projected by the projector onto the reflective layer.

[0012] The opaque and partially transparent reflective layers are suitably designed to reflect visible light in the wavelength range of 380 nm to 780 nm. The opaque and partially transparent reflective layers preferably reflect p-polarized light and s-polarized light in equal proportions, but they may also reflect p-polarized light and s-polarized light to different degrees. The opaque reflective layers and partially transparent reflective layers preferably have a high and uniform reflectivity (through various irradiation angles) for p-polarized and / or s-polarized radiation, thereby ensuring high-intensity color-neutral image presentation. In the reflection of p-polarized light, fewer ghost images appear, thereby achieving improved visual quality of the reflected light (e.g., virtual images). The reflectivity can be increased by mixing s-polarized light.

[0013] The laminated glass sheet can be part of a projection device, wherein the partially transparent reflective layer can be irradiated with a projector and the opaque reflective layer can be irradiated with a further projector. In this case, the projector and the further projector preferably project a virtual image onto the respective reflective layers. Due to the different reflection properties, a uniform image can be achieved both on the partially transparent reflective layer in the see-through area and on the opaque reflective layer outside the see-through area. This is a major advantage of the invention. The projector is a HUD projector and the further projector can be a HUD projector, but its energy consumption can also be lower than a conventional HUD projector, because due to the opacity of the opaque reflective layer, the virtual image is easily perceptible even at a low light intensity of the projector.

[0014] The outer glass pane has an outer surface facing away from the thermoplastic interlayer and is also the outer surface of the laminated glass pane. The outer glass pane also has an inner surface facing the thermoplastic interlayer. The inner surface of the inner glass pane is also the inner surface of the laminated glass pane. The inner glass pane also has an outer surface facing the thermoplastic interlayer. The laminated glass pane is provided for separating the external environment from the interior, preferably the vehicle interior. The outer surface of the outer glass pane is provided to face the external environment, while the inner surface of the inner glass pane is provided to face the interior.

[0015] The laminated glass pane has a peripheral edge, which particularly preferably comprises an upper edge and a lower edge and two side edges extending therebetween, i.e. a left edge and a right edge. The top edge is the edge which is intended to point upwards in the installed position. The bottom edge is the edge which is intended to point downwards in the installed position. The top edge is also often referred to as the roof edge, while the bottom edge is referred to as the engine edge. The laminated glass pane can have any suitable geometry and / or curvature. The specifications "left" and "right" relate to the specifications of the side or direction in which an observer observes the installed laminated glass pane according to the invention from the inside.

[0016] In a particularly preferred embodiment of the invention, the opaque reflective layer is arranged in front of the masking layer from a viewing angle through the laminated glass pane. Thus, from a viewing angle through the laminated glass pane in the direction from the inner glass pane to the outer glass pane, the opaque reflective layer is arranged in front of the opaque masking layer. Conversely, from a viewing angle through the laminated glass pane in the direction from the outer glass pane to the inner glass pane, the masking layer covers the entire opaque reflective layer. Thus, the masking layer can be arranged congruent with the opaque reflective layer or can completely cover the opaque reflective layer and additionally extend beyond the surface of the laminated glass pane. The viewing angle in the direction from the inner glass pane to the outer glass pane or from the outer glass pane to the inner glass pane refers to an observation direction arranged perpendicular to the main surface of the laminated glass pane. In the sense of the present invention, "element A is completely covered by element B" means that the orthogonal projection of element A onto the plane of element B is completely located within element B.

[0017] The masking layer can be an opaque enamel or an opaque thermoplastic film. The masking layer can also be a thermoplastic film that is opaque in certain areas and can therefore be a component of a thermoplastic interlayer. The masking layer is particularly a dark, preferably black enamel that is applied to the outer glass plate. The masking layer is preferably applied to the inner surface of the outer glass plate. The masking layer is preferably a peripheral (frame-shaped) layer that extends along the peripheral edge of the laminated glass plate and can be widened in the area of ​​the opaque reflective layer. The masking layer mainly serves to protect the assembly adhesive of the laminated glass plate (for example, for bonding to a vehicle) from UV. The transmittance of the masking layer for visible light (according to ISO 9050:2003) is preferably less than 15%, preferably less than 10%, and particularly preferably less than 1%. The masking layer can also be designed to be at least partially translucent, such as a dot pattern, a stripe pattern or a checkered pattern. Alternatively, the masking layer can also have a gradient, such as from an opaque covering to a translucent covering.

[0018] The laminated glass pane can also have a plurality of, preferably two, masking layers, wherein preferably a first masking layer is applied to the inner surface of the outer glass pane and a second masking layer is applied to the inner surface of the inner glass pane.

[0019] In a particularly preferred embodiment of the invention, the masking layer is arranged in a frame-like manner in the peripheral edge region of the laminated glass pane and is widened in a portion of the peripheral edge region adjacent to the lower edge of the laminated glass pane. The width of the masking layer in the widened region is preferably 10 cm or more, particularly preferably 20 cm or more, in particular 30 cm or more. This embodiment is particularly suitable for use in vehicles, where the projection device can be used as a substitute for a display installed in the instrument panel.

[0020] The partially transparent reflective layer has a light transmittance of at least 50%, preferably at least 60%, and particularly preferably at least 70% for light in the visible spectral range (according to ISO 9050:2003). Furthermore, the partially transparent reflective layer has a light transmittance of 90% or less, preferably 80% or less, particularly preferably exactly 70% for light in the visible spectral range (according to ISO 9050:2003). "Opaque" in the sense of the present invention means a light transmittance, i.e. a light transmittance (according to ISO 9050:2003) of less than 30%, preferably less than 20%, particularly preferably less than 5%, and in particular less than 0.1%. "Partially transparent" in the sense of the present invention means a light transmittance of at least 50%, preferably at least 60%, and particularly preferably at least 70%.

[0021] The partially transparent reflective layer preferably extends over more than 50%, preferably over 70%, particularly preferably over 90% of the surface of the laminated glass sheet. According to the invention, the partially transparent reflective layer extends at least over the entire area provided for viewing through the laminated glass sheet. This refers to the area through which the finished laminated glass sheet and optionally in the installed state (for example, the laminated glass sheet is installed in a vehicle) can be viewed, and this area is at least partially transparent. In particular, the partially transparent reflective layer extends over the entire surface of the laminated glass sheet minus the peripheral frame-shaped edge area (adjacent to the peripheral edge of the laminated glass sheet). The uncoated peripheral frame-shaped edge area serves to better separate the partially transparent reflective layer from the external environment. The partially transparent reflective layer can thus be better protected from corrosion or mechanical damage. The width of the uncoated edge area is preferably less than 20 cm, particularly preferably less than 10 cm, and in particular less than 1 cm. In the sense of the present invention, the term "width" refers to the length perpendicular to the extension direction.

[0022] The opaque reflective layer preferably extends over a maximum of 50%, preferably a maximum of 40%, particularly preferably a maximum of 20% of the surface of the laminated glass sheet. The opaque reflective layer is particularly preferably arranged adjacent to the upper edge, left edge, right edge and / or lower edge of the laminated glass sheet, wherein the uncoated edge region preferably extends between the opaque reflective layer and the upper edge, side edge and / or lower edge. The width of the uncoated edge region is preferably less than 20 cm, particularly preferably less than 10 cm, and particularly less than 1 cm. The opaque reflective layer preferably extends from one (left) side edge to the other (right) side edge in the form of a strip. The width of the opaque reflective layer is preferably at least 10 cm, particularly preferably at least 20 cm, and particularly at least 30 cm. It is advantageous to arrange the opaque reflective layer in the edge region adjacent to the lower edge, left edge, right edge and / or upper edge, particularly when the laminated glass sheet is designed as a vehicle glass, particularly in the form of a windshield.

[0023] The partially transparent reflective layer usually contains one or more (e.g., two, three or four) functional layers. The functional layer preferably contains at least one metal-e.g., silver, gold, copper, nickel and / or chromium, or a metal alloy. The functional layer particularly preferably contains at least 90% by weight of metal, in particular at least 99.9% by weight of metal. The functional layer can be composed of a metal or a metal alloy. The functional layer particularly preferably contains silver or a silver-containing alloy. The partially transparent reflective layer very particularly preferably contains at most 2 silver layers, in particular at most one silver layer, or is composed of at most 2 silver layers, in particular at most one silver layer. This functional layer has particularly favorable electrical conductivity and at the same time has high transmittance in the visible spectrum. The thickness of the functional layer is preferably 5nm to 50nm, and particularly preferably 8nm to 25nm. In this thickness region of the functional layer, favorable high transmittance and particularly favorable electrical conductivity in the visible spectrum are achieved. The partially transparent reflective layer is preferably in each case 10cm 2 Up to 1000cm 2 , particularly preferably 20cm 2 Up to 100cm 2 extends over the area.

[0024] Typically, at least one dielectric layer is arranged in each case between two adjacent functional layers of the partially transparent reflective layer. Preferably, a further dielectric layer is arranged below the first functional layer and / or above the last functional layer. The dielectric layer contains at least one individual layer made of a dielectric material - for example, containing a nitride such as silicon nitride or an oxide such as aluminum oxide. However, the dielectric layer can also include a plurality of individual layers, for example individual layers of dielectric material, smoothing layers, matching layers, barrier layers and / or antireflection layers. The thickness of the dielectric layer is, for example, from 10 nm to 200 nm.

[0025] The partially transparent reflective layer particularly preferably contains or consists of indium tin oxide (ITO), fluorine-doped tin oxide (SnO 2 :F) or aluminum-doped zinc oxide (ZnO:Al).

[0026] Alternatively, the partially transparent reflective layer may also contain or consist of carbon nanobuds (CNBs). CNBs are a modification of carbon. The carbon atoms are covalently bonded and form fullerenes arranged in the form of nanoscale tubes. They combine the properties of fullerenes and nanotubes, thereby having both high mechanical stability and good electrical properties.

[0027] The geometric layer thickness of the partially transparent reflective layer is preferably at most 1000 nm, particularly preferably at most 100 nm, very particularly preferably at most 15 nm. In particular, the layer thickness of the partially transparent reflective layer is preferably 1 nm to 100 nm, particularly preferably 10 nm to 50 nm. Thus, a favorable reflectivity can be achieved in the IR range without reducing the transmittance too much. The geometric layer thickness of the partially transparent reflective layer is preferably at least 6 nm, particularly preferably at least 8 nm; in particular, when the partially transparent reflective layer consists of a silver layer, it has the stated layer thickness. Thinner layer thicknesses can lead to dewetting of the layer structure. Particularly preferably, the geometric layer thickness of the partially transparent reflective layer is 10 nm to 14 nm, in particular 11 nm to 13 nm.

[0028] When referring to thin layers, i.e. layers with a thickness below 1000 nm, the following applies: If something is "based on" a certain material, it consists mainly of this material, in particular essentially of this material, apart from any impurities or dopings. Unless otherwise stated, layer thickness or thickness specifications relate to the geometric thickness of the layer.

[0029] The laminated glass pane according to the invention preferably has an average reflectivity of at least 10%, particularly preferably at least 12%, and in particular at least 15%, for p-polarized radiation in the region provided with the partially transparent reflective layer, preferably in the spectral range of 380 nm to 780 nm, particularly preferably in the spectral range of 380 nm to 680 nm. This generates a projection image of sufficient intensity. Independently thereof, the laminated glass pane preferably has an average reflectivity of at least 30%, particularly preferably at least 40%, and in particular at least 70% for p-polarized radiation in the region provided with the opaque reflective layer, preferably in the spectral range of 380 nm to 780 nm, particularly preferably in the spectral range of 380 nm to 680 nm. The opaque reflective layer and the partially transparent reflective layer may overlap each other outside the see-through region. In the overlapping region, the percentage ratio of the reflected light is substantially defined by the opaque reflective layer.

[0030] The reflectivity is measured at an angle of incidence of 65° to the inner surface normal (inner surface of the inner glass pane), which corresponds to the irradiation of a conventional HUD projector, for example. The spectral range from 380 nm to 680 nm is used to characterize the reflection properties, because the visual impression of the observer is mainly formed by this spectral range. In addition, it also covers the wavelengths that are relevant for HUD presentation (RGB: 473 nm, 550 nm, 630 nm). The angle of incidence of the projector radiation is the angle between the incident vector of the projector radiation and the inner surface normal (i.e. the surface perpendicular to the inner and outer surfaces of the laminated glass pane, which here is also the inner surface of the inner glass pane).

[0031] Reflectivity describes the proportion of the total irradiated radiation that is reflected. It is expressed as a % (based on 100% emitted radiation) or as a unitless number from 0 to 1 (normalized to the emitted radiation). When plotted as a function of wavelength, it forms a reflection spectrum. Within the scope of the present invention, statements about the reflectivity relative to p-polarized, unpolarized or s-polarized radiation (or percentage specifications about reflection) relate to the reflectivity measured at an angle of incidence of 65° to the normal to the internal surface. Information about the reflectivity or the reflection spectrum relates to reflection measurements made with a light source that radiates uniformly at a normalized radiation intensity of 100% over the observed spectral range.

[0032] The above-mentioned desired reflection properties of the partially transparent or opaque reflective layer are achieved in particular by selecting the material and thickness and structure of the individual layers or layer sequences. Partially transparent and opaque reflective layers can thus be suitably adjusted.

[0033] The opaque reflective layer preferably comprises at least one metal selected from aluminum, magnesium, tin, indium, titanium, tantalum, niobium, nickel, copper, chromium, cobalt, iron, manganese, zirconium, cerium, scandium, yttrium, silver, gold, platinum, and palladium, ruthenium or a mixture thereof. Alternatively or additionally, the reflective layer comprises an oxide, carbide, silicon, a silicon compound and / or a nitride selected from boron-doped silicon, a silicon-zirconium mixed nitride, silicon nitride, titanium oxide, silicon oxide, titanium carbide, zirconium carbide, silicon-zirconium-aluminum or a mixture thereof. Aluminum, titanium, nickel-chromium and / or nickel are preferably applied to the inner or outer glass pane because they can have a high reflectivity for p-polarized light or s-polarized light. They are therefore particularly suitable as a component of a projection device. The thickness of the opaque reflective layer is preferably 10 nm (nanometer) to 100 μm (micrometer), particularly preferably 50 nm to 50 μm, in particular 100 nm to 5 μm.

[0034] In a preferred embodiment of the present invention, the opaque reflective layer is a coating containing a thin film stack, i.e. a layer sequence of thin individual layers. The thin film stack contains one or more conductive layers based on nickel, nickel-chromium, titanium and / or aluminum. The conductive layer based on nickel, nickel-chromium, titanium and / or aluminum provides the opaque reflective coating with basic reflective properties as well as IR-reflective effects and electrical conductivity. The conductive layer is formed based on nickel, nickel-chromium, titanium and / or aluminum. The conductive layer preferably contains at least 90% by weight of nickel, titanium and / or aluminum, particularly preferably at least 99% by weight of aluminum, very particularly preferably at least 99.9% by weight of nickel, titanium and / or aluminum. The layer based on aluminum, nickel-chromium, nickel and / or titanium can have a dopant, such as palladium, gold, copper or silver. Materials based on aluminum, nickel, nickel-chromium and / or titanium are particularly suitable for reflecting light, particularly preferably reflecting p-polarized light. It has been proven that the use of nickel, nickel-chromium, titanium and / or aluminum in the reflective layer is particularly advantageous for the reflection of light. Compared to many other metals such as gold or silver, aluminum, nickel, nickel-chromium and / or titanium are significantly more cost-effective. In addition, these metals have a high chemical and thermomechanical resistance. The thickness of the individual layers of the thin film stack is preferably 10 nm to 1 μm. The thin film stack preferably has 2 to 20 individual layers, and in particular 5 to 10 individual layers.

[0035] In a particularly preferred embodiment of the present invention, the opaque reflective layer is a metal-free reflective film and reflects visible light beams with p-polarization. The opaque reflective layer is preferably a film that works based on a synergistic prism and a reflective polarizer. Such films for the reflective layer are commercially available, for example from 3M. This allows avoiding complex metal deposition. The opaque reflective layer is preferably arranged as a reflective film in a thermoplastic interlayer.

[0036] In another particularly preferred embodiment of the present invention, the opaque reflective layer contains

[0037] A dielectric layer stack comprising a TiO2 layer and a SiO2 layer,

[0038] A dielectric layer stack comprising a SiZrN layer and a SiO2 layer,

[0039] A layer stack containing a Si:B layer or a SiZrAl layer,

[0040] A layer stack containing a Si layer and a SiO2 layer,

[0041] A layer stack comprising a Si layer and a Si3N4 layer, or

[0042] A carbide layer stack containing a TiC layer and / or a ZrC layer,

[0043] Or consist of one or more such layer stacks. The described layer stacks have suitable reflection properties in order to achieve a homogeneous image as part of a projection device.

[0044] In principle, the partially transparent reflective layer and / or the opaque reflective layer can be applied, for example, by physical or chemical vapor deposition, i.e., as a PVD or CVD coating (PVD: physical vapor deposition, CVD: chemical vapor deposition), or by a sol-gel process. Such a coating can be produced with a particularly high optical quality and a particularly low thickness. If the opaque reflective layer and / or the opaque reflective layer is a layer stack, the individual layers of the layer stack are applied continuously (i.e., one after the other). Applying layers using a sol-gel process is known to those skilled in the art and can be obtained, for example, from WO2021209201A1.

[0045] The PVD coating may be a coating applied by cathode sputtering, in particular by cathode sputtering assisted by a magnetic field (magnetron sputtering). Preferably, the opaque reflective layer and the partially transparent reflective layer are applied by magnetron sputtering. By magnetron sputtering, uniform layers with a thickness of a few nanometers can be effectively produced.

[0046] If the opaque reflective layer and / or the partially transparent reflective layer is applied by chemical vapor deposition, this is preferably done by plasma-enhanced chemical vapor deposition (PECVD); in particular, the production is carried out at atmospheric pressure (APCVD). Compared to many other methods, the advantage of plasma-enhanced chemical vapor deposition is the high application speed and at the same time high coating uniformity. In particular, this production allows the silicon oxide to be applied uniformly and efficiently to the substrate.

[0047] The opaque reflective layer is preferably applied to the outer surface of the inner glass pane by physical vapor deposition (PVD), particularly preferably by cathode sputtering, very particularly preferably by magnetic field-assisted cathode sputtering (magnetron sputtering). The opaque reflective layer is preferably applied before lamination. Instead of applying the opaque reflective layer to the surface of the glass pane, it can in principle also be applied to a carrier film arranged in the interlayer.

[0048] Preferably, the partially transparent and / or opaque reflecting layer is applied to the inner surface of the outer glass pane or to the outer surface of the inner glass pane. The partially transparent and / or opaque reflecting layer can also be applied to the masking layer and / or the outer surface of the inner glass pane and / or the inner surface of the outer glass pane. Alternatively, the partially transparent and / or opaque reflecting layer can also be applied to a film, preferably formed from an organic polymer, and the film provided with the partially transparent and / or opaque reflecting layer can be arranged in a thermoplastic interlayer.

[0049] In a particularly preferred embodiment, the opaque reflective layer is applied to the outer surface of the inner glass pane. Preferably, the partially transparent reflective layer is also applied to the outer surface of the inner glass pane. If the partially transparent reflective layer already overlaps the opaque reflective layer in certain areas, it is preferred that the opaque reflective layer is applied to the outer surface in these areas and the partially transparent reflective layer is applied to the opaque reflective layer in these areas. Applying the opaque reflective layer and the partially transparent reflective layer to the outer surface of the inner glass pane improves the reflection properties of these layers for a double image through the surface of the inner glass pane. Since the opaque reflective layer is applied directly to the outer surface of the inner glass pane and not completely or only in certain areas to the partially transparent reflective layer, an improved color uniformity is achieved.

[0050] Alternatively, the partially transparent reflective layer is applied to the outer surface of the inner glass pane and the opaque reflective layer is applied in certain areas or completely on the partially transparent reflective layer. Optionally, the portion of the opaque reflective layer that is not applied to the partially transparent reflective layer is applied to the outer surface of the inner glass pane. This arrangement makes it possible to simplify the method for producing the laminated glass pane according to the invention; since the partially transparent reflective layer is preferably applied on most of the surface of the laminated glass pane, its application is preferably carried out before the application of the opaque reflective layer.

[0051] In a very particularly preferred embodiment, the opaque reflective layer is applied to the region of the partially transparent reflective layer. According to the invention, the region of the partially transparent reflective layer is located outside the see-through region of the laminated glass pane. Preferably, the partially transparent reflective layer extends over at least 50%, particularly preferably at least 70%, in particular at least 90% of the surface of the laminated glass pane.

[0052] In a preferred embodiment, the opaque reflective layer is applied to the inner surface of the outer glass sheet. Alternatively, the opaque reflective layer is a reflective film and is arranged within the thermoplastic interlayer. Due to this arrangement, the opaque reflective layer can also be inserted after the glass sheet has been coated, thereby optimizing the production process.

[0053] In another preferred embodiment, the masking layer is arranged between the outer glass pane and the inner glass pane. The masking layer is thus better protected from external influences. From the perspective through the laminated glass pane, the partially transparent reflective layer is preferably arranged between the masking layer and the opaque reflective layer. As a result, the reflective properties of the opaque reflective layer are not reduced.

[0054] The individual layers of the laminated glass pane are preferably arranged in one of the following sequences:

[0055] Outer glass sheet - thermoplastic intermediate layer - partially transparent reflective layer - opaque reflective layer - inner glass sheet,

[0056] Outer glass sheet - thermoplastic interlayer - opaque reflective layer - partially transparent reflective layer - inner glass sheet,

[0057] Outer glass sheet - partially transparent reflective layer - opaque reflective layer - thermoplastic interlayer - inner glass sheet,

[0058] Outer glass sheet - opaque reflective layer - partially transparent reflective layer - thermoplastic interlayer - inner glass sheet,

[0059] Outer glass sheet - masking layer - thermoplastic intermediate layer - partially transparent reflective layer - opaque reflective layer - inner glass sheet,

[0060] Outer glass sheet - masking layer - thermoplastic intermediate layer - opaque reflective layer - partially transparent reflective layer - inner glass sheet,

[0061] Outer glass sheet - thermoplastic interlayer - masking layer - partially transparent reflective layer - opaque reflective layer - inner glass sheet,

[0062] Outer glass sheet - thermoplastic interlayer - masking layer - opaque reflective layer - partially transparent reflective layer - inner glass sheet,

[0063] Outer glass sheet - thermoplastic intermediate layer - partially transparent reflective layer - masking layer - opaque reflective layer - inner glass sheet,

[0064] Outer glass pane - masking layer - partially transparent reflective layer - opaque reflective layer - thermoplastic interlayer - inner glass pane, and

[0065] Outer glass pane - masking layer - opaque reflective layer - partially transparent reflective layer - thermoplastic interlayer - inner glass pane.

[0066] The opaque reflective layer and the partially transparent reflective layer cannot be applied congruently, since the partially transparent reflective layer extends at least over the see-through area of ​​the laminated glass pane, while the opaque reflective layer does not extend over the see-through area of ​​the laminated glass pane. Therefore, in the preferred layer sequence shown, the opaque reflective layer and the partially transparent reflective layer are stacked in the sequence shown only in the optionally present areas where they overlap each other. In all other areas, either the opaque reflective layer or the partially transparent reflective layer (or neither layer) is present. By way of example, the following layer sequence shows this:

[0067] Outer glass pane - thermoplastic intermediate layer - partially transparent reflective layer - opaque reflective layer - inner glass pane.

[0068] Therefore, in the area where the partially transparent reflective layer overlaps with the opaque reflective layer, the partially transparent reflective layer is arranged on the opaque reflective layer.In the see-through area, there is no opaque reflective layer according to the invention, so that the partially transparent reflective layer is arranged on the outer surface of the inner glass sheet.

[0069] The outer and inner panes are preferably made of transparent or partially transparent glass, in particular soda-lime glass, which is commonly used for windowpanes. In principle, however, the panes can also be made of other types of glass, such as borosilicate glass, quartz glass, aluminosilicate glass, or transparent plastics, such as polymethyl methacrylate or polycarbonate. The thickness of the outer and inner panes can vary greatly. Preferably, panes with a thickness of 0.8 mm to 5 mm, preferably 1.4 mm to 2.5 mm, are used, such as those with a standard thickness of 1.6 mm or 2.1 mm. The outer and inner panes can be unprestressed, partially prestressed or prestressed independently of one another. If at least one of the panes is to be prestressed, thermal prestressing or chemical prestressing can be used.

[0070] The thermoplastic intermediate layer is preferably formed as at least one thermoplastic composite film and is based on ethylene vinyl acetate (EVA), polyvinyl butyral (PVB) or polyurethane (PU) or mixtures or copolymers or derivatives thereof, particularly preferably based on polyvinyl butyral (PVB) and additional additives known to those skilled in the art, such as plasticizers. The thermoplastic film preferably contains at least one plasticizer.

[0071] The thermoplastic interlayer can be formed by a single film or by more than one film. The thermoplastic interlayer can be formed by one or more thermoplastic films arranged in a stack, wherein the thickness of the thermoplastic interlayer after lamination of the layer stack is preferably 0.25 mm to 1 mm, typically 0.38 mm or 0.76 mm. The thermoplastic interlayer can also be formed by a film that is colored and opaque in certain areas. The masking layer can also be a component of the thermoplastic interlayer. The interlayer can also be formed by more than one film, and at least two films extend over different areas of the surface of the laminated glass sheet.

[0072] The thermoplastic intermediate layer can also be a functional thermoplastic film, in particular a film with acoustic damping properties, a film reflecting infrared radiation, a film absorbing infrared radiation and / or a film absorbing UV radiation. For example, the thermoplastic intermediate layer can therefore also be a band filter film.

[0073] The outer pane, the inner pane and the laminated pane may have any three-dimensional shape. Preferably, the inner pane and the outer pane do not have any shadow areas, so that they can be effectively coated by cathode sputtering. The inner pane and the outer pane and thus the laminated pane are preferably flat or slightly or strongly curved in one or several directions in space.

[0074] If something is formed "based on" a polymer material, it consists essentially of this material, i.e. to an extent of at least 50%, preferably to an extent of at least 60%, and in particular to an extent of at least 70%. It may therefore also contain other materials, such as stabilizers or plasticizers.

[0075] Another aspect of the invention relates to a projection device comprising a laminated glass pane according to the invention, a projector which projects an image onto a partially transparent reflective layer, preferably through an inner glass pane, and a further projector which projects an image onto an opaque reflective layer, preferably through the inner glass pane. In other words: the respective projector irradiates the opaque or partially transparent reflective layer with visible light, wherein the respective reflective layer at least partially reflects the visible light. The projector and the further projector preferably face the inner surface of the inner glass pane. If the laminated glass pane is irradiated in the installed state (e.g. as a windshield of a vehicle), the projector and the further projector irradiate the reflective layer or the HUD area from the inside (inside the vehicle).

[0076] The radiation of the projector and / or the further projector is preferably predominantly p-polarized and therefore has a p-polarized radiation proportion of greater than 50%. The higher the proportion of p-polarized radiation in the total radiation of the projector, the greater the intensity of the desired projected image and the weaker the intensity of the unwanted reflections at the windshield surface. The proportion of p-polarized radiation of the projector is preferably at least 70%, particularly preferably at least 80% and in particular at least 90%. In a particularly advantageous embodiment, the radiation of the projector is essentially purely p-polarized; the p-polarized radiation component is therefore 100% or has only negligible deviations therefrom.

[0077] The indication of polarization direction refers to the plane of incidence of the radiation on the laminated glazing. P-polarized radiation is radiation whose electric field oscillates in the plane of incidence. P-polarized radiation is radiation whose electric field oscillates perpendicular to the plane of incidence. The plane of incidence consists of the incidence vector and the normal to the surface of the laminated glazing in the geometrical center of the irradiated area.

[0078] If the projection device is a component of a vehicle, the projector and the further projector are preferably arranged in the dashboard of the vehicle. The image projected by the projector onto the reflective layer is reflected into the vehicle interior, for example into the field of vision of the occupants. Due to the opaque reflective layer optionally additionally arranged in front of the masking layer, the image projected onto the opaque reflective layer can be visually perceived with high contrast. As a result, projectors with lower energy requirements can be used. Compared to projectors of conventional head-up displays, the energy requirement of the projector can be reduced by up to 20%.

[0079] The projector and / or the further projector is preferably a liquid crystal (LCD) display, a thin film transistor (TFT) display, a light emitting diode (LED) display, an organic light emitting diode (OLED) display, an electroluminescent (EL) display or a micro LED display.

[0080] As in the case of HUDs and projection devices based on similar technologies, the projector and the further projector in particular irradiate the corresponding reflective layer, i.e. the projection surface of the reflective layer, with p-polarized radiation in the wavelength range of 380 nm to 780 nm. The p-polarized radiation is reflected in the region of the projection surface in the direction of the observer, thereby generating a virtual image, which the observer perceives as being seen by the observer behind the laminated glass sheet (in the case of a HUD). The beam direction of the projector and / or the further projector can usually be changed by mirrors, in particular in the vertical direction, to adapt the projection to the body shape of the observer. The area in which the observer's eyes must be located at a given mirror position is called the eyebox window. The eyebox window can be moved vertically by adjusting the mirror, where the entire area accessible thereby (i.e., the superposition of all possible eyebox windows) is called the eyebox. An observer located within the eyebox can perceive the virtual image. Of course, this means, for example, that the observer's eyes must be located within the eyebox, rather than the entire body.

[0081] The technical terms used in the field of HUD are generally known to those skilled in the art. For a detailed presentation, reference may be made to the paper entitled "Simulation-based measurement technology for testing head-up displays" by Alexander Neumann of the School of Information at the Technical University of Munich (Munich: University library of TU Munich, 2012), in particular Chapter 2 "The head-up display".

[0082] The above statements and preferred embodiments in connection with the laminated glazing or the projection device apply equally to the method. The following statements and preferred embodiments in connection with the method according to the invention apply equally to the laminated glazing and the projection device.

[0083] Another aspect of the invention relates to a method for producing a laminated glass panel according to the invention. The method comprises the following method steps, preferably in the order described:

[0084] (A) providing a layer stack formed by an outer glass pane, a thermoplastic intermediate layer (4) and an inner glass pane,

[0085] (B) a partially transparent reflective layer and an opaque reflective layer are arranged between the outer glass sheet and the inner glass sheet, and

[0086] (C) Laminating the layer stack to form a laminated glass sheet.

[0087] In a preferred embodiment, the second process step (B) is divided into three separate steps:

[0088] (B.1) A partially transparent reflective coating is applied to the outer glass pane or the inner glass pane, preferably to the inner surface of the inner glass pane.

[0089] (B.2) The inner glass plate and the outer glass plate are bent by a bending method so that they can better meet the requirements of the vehicle windshield.

[0090] (B.3) Applying an opaque reflective layer to the curved outer pane and the optional partially transparent reflective layer, or applying an opaque reflective layer to the curved inner pane and the optional partially transparent reflective layer.

[0091] The lamination of the layer stack is carried out under the action of heat, vacuum and / or pressure, wherein the individual layers are bonded (laminated) by at least one thermoplastic film. Laminated glass sheets can be produced using methods known per se. For example, the so-called autoclave process can be carried out at an elevated pressure of about 10 bar to 15 bar and a temperature of 130° C. to 145° C. for about 2 hours. The vacuum bag or vacuum ring method known per se operates, for example, at about 200 mbar and 130° C. to 145° C. The layer stack can also be pressed between at least one pair of rollers with a calender to form a laminated glass sheet. This type of equipment for producing laminated glass sheets is known and usually has at least one heating channel upstream of the pressing unit. For example, the temperature range during the pressing process is 40° C. to 150° C. In practice, a combination of calendering and high-pressure methods has proven to be particularly successful. Alternatively, a vacuum laminator can also be used. They consist of one or more heatable and evacuable chambers in which outer and inner glass panes can be laminated at reduced pressures of 0.01 to 800 mbar and temperatures of 80 to 170° C. within, for example, about 60 minutes.

[0092] The laminated glass pane according to the invention can be, for example, a roof pane, a windshield, a side pane or a rear pane of a vehicle, or other vehicle glazing, such as a partition pane in a vehicle, preferably a rail vehicle, a car or a bus. Alternatively, the laminated glass pane can be an architectural glazing, such as a partition pane in a building facade or in a building interior, or a component in a piece of furniture or equipment.

[0093] The present invention is explained in more detail below with reference to the accompanying drawings and embodiments. The accompanying drawings are presented schematically and are not drawn to scale. The accompanying drawings do not limit the present invention in any way. In the accompanying drawings:

[0094] Figure 1 An embodiment of a laminated glass panel according to the invention is shown in plan view,

[0095] Figure 2 Shows that there is Figure 1 A cross-sectional view of a projection device of a laminated glass sheet, Figure 3 The cross-sectional view shows Figure 2 an enlarged edge area of ​​the projection device, and

[0096] Figure 4-Figure 7 A further embodiment of a laminated glass pane according to the invention in a projection device is shown in a cross-sectional view.

[0097] Figures 1 to 3 Different aspects of an embodiment of a laminated glazing 1 according to the invention are shown. Figure 1 A laminated glazing 1 according to the invention is shown in the form of a windscreen for a vehicle. The laminated glazing 1 is shown in a plan view, wherein the viewing angle is towards the inner surface IV of the laminated glazing 1 . Figure 2 A laminated glass pane 1 is shown in a cross-sectional view as a component of a projection device 100 according to the invention, wherein the projection device 100 is installed in a vehicle. Figure 2 The cross-sectional view corresponds to Figure 1 The laminated glass pane 1 is shown along section line AA′. Figure 3 Shows Figure 2 1 . An enlarged detail of the projection device 100 is shown, wherein the lower edge region adjacent to the lower edge 10 . 2 of the laminated glass pane 1 is shown.

[0098] The laminated glass panel 1 has an upper edge 10.1 and a lower edge 10.2 and two side edges connecting the upper edge 10.1 and the lower edge 10.2, which together form the peripheral edge of the laminated glass panel 1. The lower edge 10.2 of the laminated glass panel 1 (also called the engine edge) is the edge facing the floor in the installed position. The upper edge 10.1 of the laminated glass panel 1 (also called the roof edge) is the edge facing the roof of the vehicle in the installed position.

[0099] The laminated glass panel 1 comprises an outer glass panel 2, an inner glass panel 3 and a thermoplastic interlayer 4 arranged between the outer glass panel 2 and the inner glass panel 3. The outer glass panel 2 has an outer surface I facing away from the thermoplastic interlayer 4 and an inner surface II facing the thermoplastic interlayer 4. The inner glass panel 3 has an outer surface III facing the thermoplastic interlayer 4 and an inner surface IV facing away from the thermoplastic interlayer 4. The outer surface I of the outer glass panel 11 is also the surface of the laminated glass panel 1 facing the external environment 14, and the inner surface IV of the inner glass panel 3 is also the surface of the laminated glass panel 1 facing the vehicle interior 13. The laminated glass panel 1 has a shape and curvature commonly used for windshields, for example.

[0100] The outer glass plate 2 and the inner glass plate 3 are each made of glass (preferably thermally prestressed soda-lime glass) and are transparent to visible light. The thickness of the outer glass plate 2 is, for example, 2.1 mm, and the thickness of the inner glass plate 3 is, for example, 1.5 mm. The thermoplastic interlayer 4 comprises a thermoplastic plastic, preferably polyvinyl butyral (PVB), ethylene-vinyl acetate (EVA) and / or polyethylene terephthalate (PET).

[0101] A first opaque masking layer 9, 9.1 is applied to the inner surface IV of the inner glass pane 3. A second opaque masking layer 9, 9.2 is applied to the inner surface II of the outer glass pane 2. The first and second masking layers 9.1, 9.2 extend in a frame-like manner along the peripheral edge of the laminated glass pane 1. The second masking layer 9, 9.2 is applied in the lower edge region directly adjacent to the lower edge 10.2 of the laminated glass pane 1, opposite to the upper edge region directly adjacent to the upper edge 10.1 of the laminated glass pane 1. The first and second masking layers 9.1, 9.2 are opaque and block the view of structures arranged inside or outside the laminated glass pane 1, such as adhesive beads for bonding the laminated glass pane 1 to the vehicle body. The first and second opaque masking layers 9.1, 9.2 consist of a non-conductive material commonly used for black prints, such as a burned-in black screen printing ink.

[0102] A partially transparent reflective layer 5 is applied to the outer surface III of the inner glass pane 3. The partially transparent reflective layer 5 extends over the entire outer surface III of the inner glass pane 3, except for peripheral edge regions and optional local regions, which serve as communication, sensor or camera windows and are intended to ensure the transmission of electromagnetic radiation through the laminated glass pane 1 (not shown) and are therefore not provided with a partially transparent reflective layer 5. The width of the peripheral uncoated edge region is, for example, 2 cm. It prevents the semi-transparent reflective layer 5 from direct contact with the surrounding atmosphere, thereby protecting the semi-transparent reflective layer 5 inside the laminated glass pane 1 from corrosion and damage, and electrically insulating the vehicle body from the semi-transparent reflective layer 5. The partially transparent reflective layer 5 is, for example, a film stack containing a silver layer, the layer thickness of which is 15 nm.

[0103] The opaque reflective layer 6 is applied to the partially transparent reflective layer 5 in certain areas. It is located in the lower edge area of ​​the laminated glass panel 1 adjacent to the first masking layer 9, 9.1, that is, it is arranged closer to the lower edge 10.2 of the laminated glass panel 1 than to the upper edge 10.1. In the installed position, the opaque reflective layer 6 is arranged near the instrument panel 15 in the vehicle. Therefore, the opaque reflective layer 6 extends from the left edge to the right edge of the laminated glass panel 1 without overlapping with the first masking layer 9, 9.1. The width of the opaque reflective layer 6 is, for example, 30 cm. The opaque reflective layer 6 is also arranged in such a way that it completely covers the widened part of the second masking layer 9, 9.2 from the perspective of the interior 13 through the laminated glass panel 1. Therefore, the opaque reflective layer 6 is arranged in front of the second masking layer 9, 9.2 on the inside of the vehicle. In other words, from the perspective of the external environment 15 through the laminated glass panel 1, the second masking layer 9, 9.2 completely covers the reflective layer 6. The opaque reflective layer 6 is arranged outside the see-through area 7 provided for see-through, while the partially transparent reflective layer 5 extends over the entire see-through area 7 and also extends beyond the see-through area 7. The opaque reflective layer 6 is, for example, a thin film layer stack composed of a TiO2 layer and a SiO2 layer, which are stacked as required. The opaque reflective layer 6 and the partially transparent reflective layer 5 are suitably designed to reflect visible light.

[0104] The projector 11 and the further projector 12 are arranged on a dashboard 15 of the vehicle, and each projects a virtual image in the form of visible light 8 onto the opaque reflective layer 6 or the partially transparent reflective layer 5. The projector 11 projects a virtual image in the form of visible light 8 onto the partially transparent reflective layer 5. The area of ​​the partially transparent reflective layer 5 irradiated by the projector 11 is Figure 1 The other projector 12 projects the virtual image in the form of visible light 8 onto the opaque reflective layer 6. The area of ​​the opaque reflective layer 6 irradiated by the other projector 12 is shown in FIG. Figure 1 The dotted area is indicated in the form of a strip on the laminated glass sheet 1. Visible light 8 of the projector 11 and the other projector 12 is reflected at the partially transparent reflective layer 5 or the opaque reflective layer 6, and the reflected light 8' is visually perceived by an observer (eg, a driver of a vehicle).

[0105] The projector 11 irradiates the area of ​​the partially transparent reflective layer 6 in the see-through area 7 of the laminated glass panel 1, thereby generating a HUD image (head-up display image) for the observer. Another projector 12 irradiates the opaque reflective layer 6 outside the see-through area 7, which is additionally arranged in front of the masking layers 9, 9.2. Since the reflective layer 6 is opaque and arranged in front of the opaque masking layers 9, 9.2, the virtual image is visually perceptible at a higher contrast (compared to the HUD image). This makes it possible to use a projector 12 with low light intensity (i.e. lower energy consumption). The projector 11 and the other projector are, for example, light emitting diode displays (LED displays).

[0106] Reference now Figures 4 to 7 , in which enlarged cross-sectional views of various embodiments of laminated glass panes 1 are shown. Figures 4 to 7 The cross-sectional view corresponds to Figure 1 and Figure 2 The section line AA′ is shown in the lower edge region adjacent to the lower edge 10 . 2 of the laminated glass pane 1 . Figures 4 to 7 The variant shown corresponds essentially to Figure 1 , Figure 2 and Figure 3 Therefore, only the differences are discussed here, and for other aspects, please refer to Figure 1 , Figure 2 and Figure 3 Description.

[0107] and Figure 1 , Figure 2 and Figure 3 Different variations of Figure 4 The partially transparent reflective layer 5 is not applied to the outer surface III of the inner glass plate 3, but to the inner surface II of the outer glass plate 2 and the second masking layer 9, 9.2. The opaque reflective layer 6 is applied to the partially transparent reflective layer 5 in certain areas, such as for Figure 1 , Figure 2 and Figure 3 described.

[0108] Figure 5 An embodiment of the invention is shown in which the partially transparent reflective layer does not extend over the edge region of the laminated glass sheet adjacent to the lower edge 10.2. The opaque reflective layer 6 is arranged in the edge region of the laminated glass sheet 1 adjacent to the lower edge 10.2 and does not overlap the partially transparent reflective layer 5 from a perspective through the laminated glass sheet 1. The opaque reflective layer 6 is applied to the outer surface III of the inner glass sheet 3. Since the partially transparent reflective layer 5 and the opaque reflective layer 6 do not overlap each other, visual color effects that may occur due to interference of the reflected light 8' can be avoided.

[0109] exist Figure 6In the embodiment of the invention shown, the opaque reflective layer 6 is a coated reflective film, rather than a coating applied to the partially transparent reflective layer 5. The film is formed, for example, on the basis of PET and is coated with a thin film layer stack consisting of a TiO2 layer and a SiO2 layer. The opaque reflective layer 6 is arranged within the thermoplastic intermediate layer 4. The opaque reflective layer 6 is arranged between two thermoplastic composite films, for example, before a lamination process. In order to compensate for the thickness difference, the thermoplastic composite film can be formed thinner in the region that is congruent with the opaque reflective layer 6 than in other regions. The partially transparent reflective layer 6 is formed, for example, on the basis of PET. Figure 5 Arrange as described and shown.

[0110] Figure 7 An embodiment is shown in which an opaque reflective layer 6 is applied to the outer surface III of the inner pane 3 and a partially transparent reflective layer 5 is applied to the opaque reflective layer 6 in the region overlapping with the opaque reflective layer 6. In the region not overlapping with the opaque reflective layer 6, the partially transparent reflective layer 5 is applied to the outer surface III of the inner pane 3. As a result, the reflective properties of the opaque reflective layer 6 are reduced less strongly, because the light 8' reflected by the opaque reflective layer 6 does not have to be transmitted through the partially transparent reflective layer 5.

[0111] Reference numerals

[0112] 1 Laminated glass panel

[0113] 2 outer glass panels

[0114] 3 inner glass panels

[0115] 4Thermoplastic middle layer

[0116] 5 Partially transparent reflective layer

[0117] 6 Opaque reflective layer

[0118] 7. Perspective Area

[0119] 8 Visible light

[0120] 8'Reflected Light

[0121] 9 Opacity Masking Layers

[0122] 9.1 The first masking layer

[0123] 9.2 Second masking layer

[0124] 10.1 Upper edge of laminated glass panel 1

[0125] 10.2 Lower edge of laminated glass panel 1

[0126] 11 Projector

[0127] 12 Another Projector

[0128] 13 Interior

[0129] 14 External Environment

[0130] 15 Dashboard

[0131] 100 Projection Device

[0132] The outer surface of the outer glass plate 2

[0133] II Inner surface of outer glass plate 2

[0134] III. The outer surface of the inner glass plate 3

[0135] IV Inner surface of inner glass plate 3

[0136] A-A' hatch line

Claims

1. A laminated glass sheet (1) for a projection device (100), comprising: - an outer glass pane (2), a thermoplastic intermediate layer (4) and an inner glass pane (3), - a partially transparent reflective layer (5), and - an opaque reflective layer (6), The partially transparent reflective layer (5) and the opaque reflective layer (6) are arranged between the outer glass plate (2) and the inner glass plate (3), wherein the opaque reflective layer (6) is arranged outside the see-through area (7) of the laminated glass pane (1), and the partially transparent reflective layer (5) extends over at least the entire see-through area (7) of the laminated glass pane (1), The degree of reflection of the opaque reflective layer (6) to the visible light (8) is at least 30%, and the degree of reflection of the partially transparent reflective layer (5) to the visible light (8) is at most 30%.

2. The laminated glass panel (1) according to claim 1, wherein the opaque reflective layer (6) is arranged in front of the masking layer (9) when viewed through the laminated glass panel (1).

3. The laminated glass pane (1) according to claim 1 or 2, wherein the partially transparent reflecting layer (5) extends over at least 90% of the surface of the laminated glass pane (1).

4. The laminated glass pane (1) according to any one of claims 1 to 3, wherein the opaque reflective layer (6) is arranged in an upper edge region or a lower edge region adjacent to an upper edge (10.1) or a lower edge (10.2) of the laminated glass pane (1).

5. The laminated glass pane (1) according to any one of claims 1 to 4, wherein the partially transparent reflective layer (5) contains or consists of at most 2, preferably at most 1, silver layers.

6. The laminated glass pane (1) according to any one of claims 1 to 5, wherein the layer thickness of the partially transparent reflective layer (5) is from 1 nm to 100 nm, preferably from 10 nm to 50 nm.

7. The laminated glass pane (1) according to any one of claims 1 to 6, wherein the opaque reflective layer (6) reflects visible light (8) to a degree of at least 40%, preferably to a degree of at least 70%.

8. Laminated glass pane (1) according to any one of claims 1 to 7, wherein the partially transparent reflective layer (5) reflects visible light (8) to a degree of at least 10%, preferably to a degree of at least 15%.

9. The laminated glass pane (1) according to any one of claims 1 to 8, wherein the opaque reflective layer (6) contains silicon, aluminum, zirconium, nickel, chromium, boron-doped silicon, silicon-zirconium mixed nitride, silicon nitride, titanium oxide, silicon oxide, titanium carbide, zirconium carbide, silicon-zirconium aluminum and / or mixtures thereof.

10. Laminated glass pane (1) according to any one of claims 1 to 9, wherein an opaque reflective layer (6) is applied to the outer surface (III) of the inner glass pane (3) facing the thermoplastic interlayer (4).

11. The laminated glass pane (1) according to any one of claims 1 to 9, wherein an opaque reflective layer (6) is applied to the region of the partially transparent reflective layer (5).

12. Laminated glass pane (1) according to any one of claims 1 to 11, wherein a partially transparent reflective layer (5) is applied to the outer surface (III) of the inner glass pane (3) facing the thermoplastic interlayer (4).

13. A projection device (100), comprising - A laminated glass pane (1) according to any one of claims 1 to 12, - a projector (11) which projects an image onto the partially transparent reflective layer (5), and - Another projector (12) which projects an image onto the opaque reflective layer (6).

14. A method for producing a laminated glass panel (1) according to any one of claims 1 to 12, wherein (A) providing a layer stack formed by an outer glass pane (2), a thermoplastic intermediate layer (4) and an inner glass pane (3), (B) arranging a partially transparent reflective layer (5) and an opaque reflective layer (6) between the outer glass sheet (2) and the inner glass sheet (3), and (C) The layer stack is laminated to form a laminated glass sheet (1).

15. Use of a laminated glass pane (1) according to any one of claims 1 to 12 in means of transport for land, air or water transport, preferably in motor vehicles, for example as windshield, rear glass, side glass and / or glass roof, particularly preferably as roof glass or as functional and / or decorative individual parts, and as an installation component in furniture, equipment and buildings.

Images