CN116547141A - Composite glass pane with locally applied reflective layer - Google Patents

Abstract

The invention relates to a composite glass pane (100) comprising at least an outer glass pane (1), a thermoplastic interlayer (3), an inner glass pane (2), a masking layer (4) arranged in one region of the composite glass pane (100), an adhesive layer (5), a vitreous glass pane (6) having an outer side surface (V) and an inner side surface (VI) and having a thickness of 20 [ mu ] m to 500 [ mu ] m. The inner glass plate (2) is arranged between the outer glass plate (1) and the vitreous glass plate (6), the thermoplastic interlayer (3) is arranged between the outer glass plate (1) and the inner glass plate (2), the adhesive layer (5) is arranged between the inner glass plate (2) and the vitreous glass plate (6), the reflective layer (7) for reflecting light is arranged on the outer side surface (V) of the vitreous glass plate (6) and/or on the inner side surface (VI) of the vitreous glass plate (6), and the vitreous glass plate (6) is arranged in a region of the composite glass plate (100) which is entirely located in the region in which the masking layer (4) is arranged when seen vertically through the composite glass plate (100).

Description

Composite glass pane with locally applied reflective layer

The invention relates to a composite glass pane with a locally applied reflective layer, a method for its production and its use as well as a projection device.

Modern vehicles are increasingly equipped with so-called head-up displays (HUD). Via a projector, usually located in the dashboard area, an image is projected onto the windscreen panel, where it is reflected and perceived by the driver as (from his point of view) a virtual image behind the windscreen panel. Important information, such as current driving speed, navigation or warning indications, can thus be projected into the driver's field of vision and perceived without taking his eyes off the roadway. Head-up displays can therefore clearly contribute to improving traffic safety.

HUD projection devices are disclosed in JP H09 43530 A, US 2009/295681 A1, WO 2021/145387 A1, US 2019/285882 A1, EP3 429 844 81 and CN 113 238 377 A.

However, a frequent problem with head-up displays is that the area of the windshield panel which is arranged to reflect the light projected by the projector must have a high transparency, typically at least 70%. The reflected projector light is thus superimposed on the light from the external environment, which, depending on the light conditions, leads to a reduction in the contrast of the virtual image and thus to a poorer visual perception of the driver. Sufficient visual perceptibility of especially safety-relevant information such as lane assistance, speed display or engine speed should be ensured in all weather and light conditions. It would therefore be desirable to have a projection device based on head-up display technology in which no unwanted secondary images occur and whose arrangement can be realized relatively easily with good legibility and sufficient brightness and contrast of the displayed image information. In order to achieve this, the contrast in the reflective area of the windshield must be increased. An increase in contrast can be achieved, for example, by making the background of the reflective area mostly or completely opaque. However, this solution requires the application of the reflective layer only in locally limited areas of the windscreen.

The application of metallic reflective coatings on vitreous glass panes is usually achieved by sputtering, in particular magnetron sputtering. In sputtering, atoms are released from a target, such as a metallic material, by ion bombardment. Using physical vapor deposition, a vitreous glass plate is coated with atoms released from a target in an evacuated chamber. The atoms are moved through the chamber to the vitreous glass plate guided by the electric field. Thus, they move from the cathode, where the target is arranged, to the anode. Due to the arrangement of the vitreous glass plate between the cathode and the anode, layers are formed on the vitreous glass plate. In the case of magnetron sputtering, an additional magnetic field is arranged behind the cathode, which leads to faster layer growth and denser, ie lower porosity, layers. Methods for coating vitreous glass sheets using sputtering are known, for example, from WO 9900528A1, DE 10126868C1 and WO 2017198363A1.

Magnetron sputtering is therefore also suitable for coating vitreous glass sheets because, unlike many other coating technologies, it can also be used in the case of curved vitreous glass sheets, e.g. as in the case of the board. However, sputtering has the disadvantage that it is not possible to selectively coat only specific surface areas without special precautions, but always only the entire surface. A selective coating of only certain surface regions can be achieved, for example, by complex masking of the regions that should not be coated.

Cold air spraying is also suitable as a method of coating vitreous glass sheets and is a coating method generally known to those skilled in the art in which metal powder is applied to the support at very high speed. Methods of coating by cold-air spraying are known, for example, from WO 2010/003396 A1, EP 3845685 A1 and EP 2 902 530 A1.

WO 2019/186495 A1 discloses a composite glazing with at least one stepped functional section comprising two stacks made of components, namely a main stack of components whose properties are not desired to be altered and a second stack comprising functional layers Two-component stack. The functional layer may be selected from switchable films, switchable layers, displays, lighting devices, touch sensitive layers, sensor layers, light sensors, acoustic sensors, acoustic PVB layers, heat reflective films and heat absorbing films.

It is an object of the present invention to provide an improved composite glass pane with a locally applied reflective layer. In particular, the composite glass pane should be easy to manufacture.

According to the invention, the object of the invention is achieved by a composite glass pane according to claim 1 . Preferred embodiments emerge from the dependent claims.

The composite glass pane according to the invention comprises an outer glass pane, a thermoplastic interlayer, a masking layer, an inner glass pane, an adhesive layer and a vitreous glass pane. A thermoplastic interlayer is arranged between the outer glass pane and the inner glass pane, and an adhesive layer is arranged between the inner glass pane and the vitreous glass pane. According to the invention, the masking layer is arranged in a region of the composite glass pane and the vitreous glass pane is arranged in a region of the composite glass pane which, when viewed perpendicularly through the composite glass pane, is completely located in the area in which the masking layer is arranged in the area.

Composite glass panels are provided to separate the interior space from the external environment in the window openings of the vehicle. In the context of the present invention, an inner glass pane refers to the glass pane of the composite glass pane facing the vehicle interior. The outer glass pane is the glass pane facing the external environment.

In particular, the laminated glass pane has an upper edge and a lower edge, as well as two side edges extending between them. By an upper edge is meant an edge which is arranged to point upwards in the installed position. The lower edge refers to the edge which is arranged to point downwards in the installed position. In the case of a windshield, the upper edge is usually called the top edge and the lower edge is called the engine edge.

The outer glass pane, the inner glass pane, and the vitreous glass pane each have an outer side surface and an inner side surface and a surrounding side edge extending therebetween. In the context of the present invention, an outer side surface refers to the main surface which is arranged to face the external environment in the installed position. In the context of the present invention, an inner side surface refers to the main surface which is arranged to face the inner space in the installed position. The inner side surface of the outer glass pane and the outer side surface of the inner glass pane face each other and are joined to each other by a thermoplastic interlayer.

The outside surface of the outer glass pane is called the I-plane. The inner surface of the outer glass sheet is called the II face. The outer surface of the inner pane is called the III plane. The inside surface of the inner glass sheet is called the IV face. The outer surface of the vitreous glass plate is called the V surface. The inner surface of the vitreous glass plate is called VI surface.

It should be understood that the inner glass pane is arranged between the outer glass pane and the vitreous glass pane. The inner side surface of the outer glass sheet and the outer side surface of the inner glass sheet face each other. The inside surface of the inner glass sheet and the outside surface of the vitreous glass sheet face each other.

According to the invention, the vitreous glass pane has a thickness of 20 μm (micrometer) to 500 μm. Therefore, a vitreous glass panel is a glass panel made of ultra-thin glass. This glass pane made of ultra-thin glass is flexible and adapts to the curvature of the glass pane.

Furthermore, according to the invention, a reflective layer for reflecting light is arranged on the outer surface of the vitreous pane and/or on the inner surface of the vitreous pane.

In the installed position of the composite glass pane in the vehicle, the reflective layer has a smaller distance from the vehicle interior than the masking layer.

Since the vitreous glass pane is arranged in a region of the composite glass pane which, when viewed perpendicularly through the composite glass pane, lies entirely in the region in which the masking layer is arranged, the reflective layer applied to this vitreous glass pane also It is arranged in a region which, when viewed vertically through the laminated glass pane, lies entirely in the region in which the masking layer is arranged. Thus, the reflective layer is arranged to overlap or superpose the masking layer when viewed perpendicularly through the laminated glass pane or when projected orthogonally on the laminated glass pane. The reflective layer therefore has no sections which do not overlap the masking layer, ie the reflective layer is designed only at a position in front of the masking layer when looking towards the inside of the laminated glass pane.

In a preferred embodiment of the composite glass pane according to the invention, the vitreous glass pane has a thickness of 50 μm to 300 μm, preferably 50 μm to 100 μm, for example 70 μm.

As described above, the reflective layer is a reflective layer for reflecting light. The reflective layer is preferably opaque or partially light-transmissive, which means in the context of the present invention that it has an average transmission in the visible spectral range of preferably at most 80%, particularly preferably at most 50%, especially less than 10% ( According to ISO 9050:2003). The reflective layer preferably reflects at least 10%, particularly preferably at least 50%, very particularly preferably at least 80%, in particular at least 90% of the light incident on the reflective layer. The reflective layer preferably reflects p-polarized light and s-polarized light in equal proportions, but may also reflect p-polarized light and s-polarized light in different degrees.

The light reflected by the reflective layer is preferably visible light, ie light in the wavelength range of about 380nm to 780nm. The reflective layer preferably has a high and uniform reflectivity (at different angles of incidence) for p-polarized and/or s-polarized radiation, thus ensuring a high-intensity and color-neutral image display.

In this case, the specification of the polarization direction refers to the plane of incidence of the radiation on the composite glass pane. P-polarized radiation is radiation whose electric field oscillates in the plane of incidence. S-polarized radiation is radiation whose electric field oscillates perpendicular to the plane of incidence. The plane of incidence is spanned by the incident vector and the surface normal of the composite glass pane at the geometric center of the illuminated area.

In other words, the polarization, ie in particular the proportion of p- and s-polarized radiation, is determined at a point in the area illuminated by the image display device, preferably at the geometric center of the illuminated area. Since the composite glass pane can be curved (e.g. when it is designed as a windshield pane), which affects the plane of incidence of the radiation of the image display device, polarization ratios slightly different from it can occur in other areas, due to physical The reason is unavoidable.

In a preferred embodiment of the invention, the reflective layer is a metallic layer, ie a layer comprising or consisting of metal.

The reflective layer preferably contains elements selected from the group consisting of aluminum, magnesium, tin, indium, titanium, tantalum, niobium, nickel, copper, chromium, cobalt, iron, manganese, zirconium, cerium, scandium, yttrium, silver, gold, platinum and palladium, ruthenium At least one metal or a mixture thereof. Aluminum, titanium and/or nickel are preferred because they can have high reflectivity for p- or s-polarized light. Aluminum is particularly preferred.

The thickness of the 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.

In a particular embodiment of the invention, the reflective layer is a coating comprising a layer sequence of thin layer stacks, ie thin individual layers. The thin-film stack comprises one or more electrically conductive layers based on nickel, titanium and/or aluminium. The conductive layer based on nickel, titanium and/or aluminum imparts substantially reflective properties to the reflective layer and furthermore an IR reflective effect and electrical conductivity. The conductive layer is formed based on nickel, titanium and/or aluminum. The electrically 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. Layers based on aluminum, nickel and/or titanium may have dopants such as palladium, gold, copper or silver. Materials based on aluminum, nickel and/or titanium are particularly suitable for reflecting light, particularly preferably p-polarized light. The use of nickel, titanium and/or aluminum in metallic coatings has proven to be particularly advantageous for the reflection of light. Aluminum, nickel and/or titanium are significantly cheaper than many other metals, such as gold or silver. The individual layers of the thin-layer stack preferably have a thickness of 10 nm to 1 μm. The thin-film stack preferably has 2 to 20 individual layers, in particular 5 to 10 individual layers.

As mentioned above, in the composite glass pane according to the invention, the masking layer is arranged in one region of the composite glass pane. The masking layer is preferably arranged in an edge region of the composite glass pane, which usually adjoins a pane edge of the glass pane. When the composite glass pane is used as a windshield pane in a vehicle, this arrangement yields great advantages, since the masking layer is arranged in the edge region outside the driver's main viewing area.

The masking layer is preferably arranged at least along and adjoins the lower edge. In a plan view of the laminated glass pane, this results in a rectangular opaque strip arranged along the lower edge.

In a particularly preferred embodiment of the composite glass pane according to the invention, the masking layer is designed as a frame-like circumference. In the section in which the vitreous glass panes and thus the reflective layer applied thereto are arranged one above the other, the masking layer, which is designed as a frame, is preferably equipped with a widening, ie has a larger diameter than in other sections. Width (the dimension perpendicular to the extension). In this way, the masking layer can be suitably adapted to the dimensions of the vitreous glass pane on which the reflective layer is applied.

In one embodiment, the masking layer is therefore designed frame-like surrounding and in particular has a greater width in the section overlapping the vitreous glass pane than in the section differing therefrom.

The vitreous glass pane, on which the reflective layer is applied, preferably has an essentially rectangular shape, which extends between the two side edges in the region close to the lower edge. Particularly preferably, the edges of the vitreous pane do not reach the side and lower edges, but are spaced therefrom, for example by 2 cm to 5 cm.

A masking layer in the context of the present invention is a layer that prevents seeing through the laminated glass pane. In this case, at most 5%, preferably at most 2%, particularly preferably at most 1%, in particular at most 0.1%, of the light in the visible spectrum is transmitted through the masking layer. Thus, the masking layer is an opaque masking layer, preferably a black masking layer.

The masking layer is preferably a coating made of one or more layers. Alternatively, the masking layer can also be a colored region of the thermoplastic intermediate layer. According to a preferred embodiment of the composite glass pane, the masking layer consists of a single layer. This has the advantage that the production of the composite glass pane is particularly simple and cost-effective, since only a single layer designed for the masking layer is required.

The masking layer is in particular an opaque covering print made of dark, preferably black, enamel.

In a preferred embodiment, the masking layer is designed as a first opaque cover print arranged on the inside surface of the outer pane, which is made in particular of a dark, preferably black, enamel.

In an alternative preferred embodiment, the masking layer is designed as a first opaque cover print arranged on the outer surface of the inner pane, which is made in particular of a dark, preferably black, enamel.

In an alternative preferred embodiment, the masking layer is designed as an opaque colored region of the thermoplastic interlayer.

In one embodiment, the thermoplastic intermediate layer is designed in one piece and is opaquely colored in one region.

A masking layer designed as an opaque colored region of the thermoplastic interlayer can also be realized by using a thermoplastic interlayer consisting of an opaque thermoplastic film and a transparent thermoplastic film. The opaque thermoplastic film and the transparent thermoplastic film are preferably arranged offset from one another so that the two films do not overlap when viewed through the laminated glass pane. The transparent and opaque films consist of or preferably contain the same plastic. Materials upon which the opaque and transparent films can be formed are those materials which are also described for the thermoplastic interlayer. The opaque film is preferably a colored film, which can have different colors, especially black.

The composite glass pane according to the invention may also have a second opaque cover print arranged on the inner side surface of the inner glass pane, in particular at least in the region in which the vitreous glass pane is arranged. By such overprinting on the inside surface of the inner glass pane, the adhesion properties of the surface to the adhesive layer are improved. The second opaque cover print is preferably designed as a frame.

In a preferred embodiment of the composite glass pane according to the invention, a reflective layer for reflecting light is arranged on the inside surface of the vitreous glass pane, and a protective layer is arranged on the reflective layer.

In another preferred embodiment of the composite glass pane according to the invention, reflective layers for reflecting light are respectively arranged on the inner surface of the vitreous glass pane and on the outer surface of the vitreous glass pane, and A protective layer is arranged on the reflective layer on the inside surface of the vitreous glass pane. For the reflective layer arranged on the outer surface of the vitreous glass pane, no protective layer is required, since the reflective layer is bonded to the inner glass pane by the adhesive layer and thus protected. Optionally, however, a protective layer can also be arranged on the reflective layer arranged on the outer surface of the vitreous glass pane.

The protective layer is preferably transparent and flat, in particular applied congruently to the reflective layer. The protective layer is preferably a polymer based on polyacrylates, polyoximes, alkyds, polyurethanes or mixtures thereof. The thickness of the protective layer is preferably 50 nm to 10 μm, more preferably 100 nm to 5 μm.

The protective layer protects the reflective layer from mechanical damage such as scratches. It can also be used to increase the durability of the reflective layer. As a result of this protective layer, fewer metal particles are separated over time and the reflective layer of the vitreous pane retains its shape longer.

In a particularly preferred embodiment of the invention, the protective layer is an easy-to-clean layer and/or an "anti-fingerprint" layer. "Easy-clean layer" in the context of the present invention means that dirt on the protective layer in the form of eg fingerprints, oil stains and dirt particles can be removed from the protective layer by using a cloth, preferably a microfibre cloth. Therefore, basically avoid grease-dissolving or abrasive cleaners and solvents, such as those based on alcohol, when cleaning the protective layer. In the context of the present invention, an "anti-fingerprint" layer is a layer in which fingerprints adhering to the protective layer are hardly or not visually perceptible. Fingerprints in particular refer to the greasy composition of human fingers which may remain on surfaces when they are touched and produce unaesthetic effects.

Preferably, the adhesive layer is a thermoplastic layer or an optically clear adhesive (OCA).

Suitable optically clear adhesives, so-called optically clear adhesives (OCAs), are known to those skilled in the art.

The adhesive layer designed as a thermoplastic layer comprises at least one thermoplastic polymer, preferably ethylene vinyl acetate (EVA), polyvinyl butyral (PVB) or polyurethane (PU) or mixtures or copolymers or derivatives thereof, Particular preference is given to PVB. The thermoplastic layer is generally formed of a thermoplastic film (bonding film). The thickness of the thermoplastic layer is preferably 0.2 mm to 2 mm, particularly preferably 0.3 mm to 1 mm, for example 760 μm. The thermoplastic layer can be formed from a single film or from more than one film.

The composite glass pane is preferably curved in one or more directions in space, as is common for automotive glass panes, with typical radii of curvature ranging from about 10 cm to about 40 m. However, the composite glass pane can also be flat, eg if it is provided as a glass pane for a bus, train or tractor.

The thermoplastic interlayer for joining the outer and inner glass panes comprises at least one thermoplastic polymer, preferably ethylene vinyl acetate (EVA), polyvinyl butyral (PVB) or polyurethane (PU) or mixtures thereof or Copolymers or derivatives, PVB is particularly preferred. The thermoplastic interlayer is typically formed of a thermoplastic film (tie film). The thickness of the thermoplastic intermediate layer is preferably 0.2 mm to 2 mm, particularly preferably 0.3 mm to 1 mm, for example 760 μm. The thermoplastic interlayer can be formed from a single film or from more than one film. The thermoplastic interlayer may also be a film with functional properties, such as a film with acoustic damping properties.

The outer and inner glass panes comprise or preferably consist of glass, particularly preferably flat glass, float glass, quartz glass, borosilicate glass, soda lime glass, aluminosilicate glass or transparent plastic, preferably rigid transparent plastic, In particular polyethylene, polypropylene, polycarbonate, polymethylmethacrylate, polystyrene, polyamide, polyester, polyvinyl chloride and/or mixtures thereof.

The outer and inner glass panes can be clear and colorless, tinted or tinted. In a preferred embodiment, the total transmission through the composite glass pane designed as a windshield pane is greater than 70% in the main perspective area (light type A). The term total transmittance is based on the method specified by ECE-R 43, Appendix 3, Section 9.1 for testing the light transmittance of glass panels for motor vehicles. The outer glass pane and the inner glass pane can be non-prestressed, partially prestressed or prestressed independently of each other. If at least one of the panes is to have a prestress, this can be thermal or chemical.

The thickness of the outer glass pane and the inner glass pane can vary widely and is therefore adapted to the requirements in each case. The thickness of the outer and inner glass panes is preferably 0.5 mm to 5 mm, particularly preferably 1 mm to 3 mm, very particularly preferably 1.6 mm to 2.1 mm. For example, the thickness of the outer glass plate is 2.1 mm and the thickness of the inner glass plate is 1.6 mm. However, the outer glass pane or in particular the inner glass pane can also be thin glass with a thickness of eg 0.55 mm.

The vitreous glass pane preferably comprises or consists of aluminosilicate glass, borosilicate glass, aluminoborosilicate glass. Vitreous glass sheets may be prestressed, partially prestressed or not prestressed.

The composite glass pane according to the invention may comprise one or more additional interlayers, in particular functional interlayers. The additional intermediate layer can in particular be an intermediate layer with acoustic damping properties, an intermediate layer reflecting infrared radiation, an intermediate layer absorbing infrared radiation, an intermediate layer absorbing UV radiation, an at least partially colored intermediate layer and/or an at least partially colored the middle layer. If multiple additional intermediate layers are present, they can also have different functions.

The invention also relates to a projection device comprising at least a composite glass pane according to the invention and an imaging unit directed towards a reflective layer.

Therefore, according to the invention there is also a projection device comprising at least

- a composite glass pane comprising at least an outer glass pane with an outer side surface and an inner side surface, a thermoplastic interlayer, an inner glass pane with an outer side surface and an inner side surface, one of the composite glass panes arranged between the outer glass pane and the inner glass pane A masking layer, an adhesive layer and a vitreous glass sheet having an outer surface and an inner surface and having a thickness of 20 μm to 500 μm in the region,

The inner glass plate is arranged between the outer glass plate and the vitreous glass plate, the thermoplastic interlayer is arranged between the outer glass plate and the inner glass plate, the adhesive layer is arranged between the inner glass plate and the vitreous glass plate, and the vitreous glass a reflective layer for reflecting light is arranged on the outer surface of the plate and/or on the inner surface of the vitreous glass plate,

and wherein the vitreous glass pane is arranged in a region of the composite glass pane which, when viewed vertically through the composite glass pane, lies entirely in the region in which the masking layer is arranged,

- and an imaging unit directed towards the reflective layer.

In particular, the combination of the reflective layer with the masking layer located behind the vehicle occupant from the point of view of it leads to good visibility of the image in the projection device according to the invention, even in the case of external solar radiation and when using low-light imaging The same is true for units. Even in these cases, images formed by the imaging unit appear bright and are excellently recognizable. This makes it possible to reduce the power of the imaging unit and thus reduce energy consumption.

From the vehicle occupant's point of view, the reflective layer is spatially arranged in front of the masking layer when viewed through the inner glass pane. As a result, the region of the composite glass pane in which the reflective layer is arranged appears opaque. The expression "when seeing through the composite glass pane" means looking through the composite glass pane starting from the inside surface of the composite glass pane. In the context of the present invention, "spatially in front" means that the reflective layer is arranged spatially farther from the outer side surface of the outer glass pane than the masking layer. Preferably, the masking layer widens at least in the region overlapping the reflective layer and in which the composite glass pane is used to display an image. This means that the masking layer has a greater width in this region when viewed perpendicularly to the closest section of the surrounding edge of the laminated glass pane than in other sections. As a result, the masking layer can be adapted to the dimensions of the reflective layer.

The imaging unit of the projection device emits light and is arranged near the inner surface of the inner glass pane so that the imaging unit illuminates the surface, wherein the light is reflected by the reflective layer of the composite glass pane. The reflective layer preferably reflects at least 10%, particularly preferably at least 50%, very particularly preferably at least 80%, especially at least 90% of the light incident on the reflective layer in the wavelength range from 400 nm to 700 nm and at an angle of incidence of 55° to 80°. This is advantageous for achieving the maximum possible brightness of the image emitted by the imaging unit and reflected on the reflective layer.

The imaging unit is used to emit an image, so it can also be called a projector, a display device or an image display device. For example, a display or other devices known to those skilled in the art may also be used as imaging unit. The imaging unit is preferably a display, particularly preferably an LCD display, LED display, OLED display or electroluminescent display, in particular an LCD display. The low installation height of the display allows easy and space-saving integration into the instrument panel of the vehicle. Furthermore, the display runs significantly more energy-efficient than other imaging units. In this case, the relatively low brightness of the display is entirely sufficient in the combination of the reflective layer according to the invention and the underlying masking layer. The radiation from the imaging unit impinges preferably at an angle of incidence of 55° to 80°, preferably 62° to 77°, into the region of the reflective layer on the laminated glass pane. The angle of incidence is the angle between the incident vector of radiation from the image display device and the surface normal at the geometric center of the reflective layer.

Interfering phantoms are avoided by arranging the reflective layer on the outer and/or inner surface of the vitreous glass pane glued to the inner surface of the inner glass pane and having a thickness of 20 μm to 500 μm.

In a projection device with a reflective layer arranged on the inner surface of a vitreous glass pane, the desired virtual image is produced by reflection on the reflective layer and no ghost images appear.

In projection devices with a reflective layer arranged on the outer surface of a vitreous glass plate, the desired virtual image is produced by reflection on the reflective layer and additionally a second virtual image, the so-called phantom or "phantom" is also produced by Reflection on the inner surface of the vitreous glass pane occurs.

In a projection device having a reflective layer disposed on the outer surface of the vitreous glass plate and a reflective layer disposed on the inner surface of the vitreous glass plate, the first virtual image passes through the A reflection on the reflective layer of the vitreous glass pane is produced, and additionally a second virtual image is produced on the reflective layer disposed on the inner surface of the vitreous glass pane.

However, at the low thickness of the vitreous glass pane according to the invention, the spatial offset between the first virtual image and the phantom or between the first virtual image and the second virtual image is small enough to appear undisturbing. This effect is due to the typical angular visual acuity of the human eye: the shift between the first virtual image and the phantom or between the first virtual image and the second virtual image caused by the thin vitreous glass plate according to the invention is of great importance to the human eye. It is no longer discernible to the naked eye.

The above-described preferred embodiments of the composite glass pane according to the invention also apply correspondingly to the projection device according to the invention comprising the composite glass pane according to the invention and an imaging unit, and vice versa.

Also according to the invention is a method for producing a composite glass pane according to the invention, which comprises at least:

a) providing a composite body made of an outer glass pane having an outer surface and an inner surface, a thermoplastic interlayer and an inner glass pane having an outer surface and an inner surface, wherein the thermoplastic interlayer is arranged between the outer glass pane and the inner glass pane, and a masking layer is arranged in a region between the outer glass pane and the inner glass pane;

b) providing a vitreous glass pane with an outer surface and an inner surface, wherein a reflective layer for reflecting light is arranged on the outer surface of the vitreous glass pane and/or on the inner surface of the vitreous glass pane;

c) joining the vitreous glass panes with the inner glass panes of the composite body by means of an adhesive layer to form a composite glass pane, such that the vitreous glass panes are arranged in a region of the composite glass panes that is visible through the composite glass Seen vertically, the plate lies entirely in the region in which the masking layer is arranged.

Steps a) and b) can be carried out in the sequence indicated, simultaneously or in reverse order. Step c) is carried out after steps a) and b).

As already mentioned above, the vitreous glass pane is arranged in a region of the composite glass pane which, when viewed vertically through the composite glass pane, lies entirely in the region in which the masking layer is arranged. Thus, the outer dimensions of the vitreous glass pane are smaller than the outer and inner glass panes of the composite glass pane. The provision of the vitreous glass pane in step b) can be carried out by applying a reflective layer over the entire inner and/or outer surface of the uncoated vitreous glass pane of the desired dimensions.

Alternatively, the provision of the vitreous glass pane in step b) can also be carried out in such a way that its outer dimensions, i.e. width and length, are larger than the desired inner surface and/or outer side of the uncoated vitreous glass pane A reflective layer is applied over the entire surface, and then a portion of the desired dimensions is cut out of this coated vitreous glass pane, for example by laser cutting.

With the vitreous glass pane provided with the reflective layer, the reflective layer can be selectively arranged in a region of the composite glass pane.

Providing the vitreous pane in step b) may additionally comprise applying a protective layer to the reflective layer applied on the inner side surface and/or the outer side surface. The protective layer is preferably applied to the reflective layer by spraying or spraying, for example using a pressure atomizer.

If the composite glass panes are to be curved, a curved outer glass pane and a curved inner glass pane are used in step a) to provide the composite body. The vitreous pane with the reflective layer is flexible due to the low thickness of the vitreous pane and is adapted in step c) to the curved inner pane of the composite body. This is an advantage of the method according to the invention. In the method according to the invention, the application of the reflective layer takes place on a flat substrate.

The composite body can be provided in step a) by lamination methods familiar to the person skilled in the art.

When providing the vitreous glass pane in step b), the reflective layer can be applied by generally known coating methods, for example magnetron sputtering or cold gas spraying.

The above-described preferred embodiments of the composite glass pane according to the invention also apply correspondingly to the method for producing the composite glass pane according to the invention.

The invention also relates to the use of the composite glass pane according to the invention as a vehicle glass pane in water, land and air transport, in particular in motor vehicles, in particular as a windshield pane for a head-up display.

The invention is explained in more detail below with reference to the drawings and examples. The drawings are schematic and not drawn to scale. The drawings do not limit the invention in any way.

in:

Figure 1 shows a top view of one embodiment of a composite glass pane according to the invention,

Figure 2 shows a section through the embodiment shown in Figure 1,

Figure 3 shows a section through another embodiment of a composite glass pane according to the invention,

Figure 4 shows a section through another embodiment of a composite glass pane according to the invention,

Figure 5 shows a section through another embodiment of a composite glass pane according to the invention,

Figure 6 shows a section through another embodiment of a composite glass pane according to the invention,

Figure 7 shows a section through another embodiment of a composite glass pane according to the invention,

Figure 8 shows a section through another embodiment of a composite glass pane according to the invention,

Figure 9 shows a section through another embodiment of a composite glass pane according to the invention,

Figure 10 shows a section through another embodiment of a composite glass pane according to the invention,

Figure 11 shows a section through another embodiment of a composite glass pane according to the invention,

Figure 12 shows a section through another embodiment of a composite glass pane according to the invention,

Figure 13 shows a section through another embodiment of a composite glass pane according to the invention,

Figure 14 shows a section through another embodiment of a composite glass pane according to the invention,

Figure 15 shows a section through another embodiment of a composite glass pane according to the invention,

Figure 16 shows a section through an embodiment of a projection device according to the invention,

Figure 17 shows a top view of another embodiment of a composite glass pane according to the invention,

Figure 18 shows a section through the embodiment shown in Figure 17, and

Figure 19 shows an embodiment of the method according to the invention using a flowchart.

FIG. 1 shows a top view of one embodiment of a composite glass pane 100 according to the invention, and FIG. 2 shows a section through the composite glass pane 100 shown in FIG. 1 along cutting line X-X'. The composite glass pane 100 shown in FIGS. 1 and 2 has an upper edge O, a lower edge U and two side edges S and comprises an outer glass pane 1 with an outer surface I and an inner surface II, an outer surface III and an inner surface An inner glass pane 2 of IV, a thermoplastic interlayer 3, a masking layer 4, an adhesive layer 5 and a vitreous glass pane 6 having an outer surface V and an inner surface VI. The thermoplastic interlayer 3 is arranged between the outer glass pane 1 and the inner glass pane 2, the inner glass pane 2 is arranged between the outer glass pane 1 and the vitreous glass pane 6, and the adhesive layer 5 is arranged between the inner glass pane 2 and the vitreous glass between plates 6. The outer glass pane 1 , the thermoplastic interlayer 3 and the inner glass pane 2 lie on top of each other over the entire surface. The masking layer 4 is arranged in a region of the composite glass pane 100 between the outer glass pane 1 and the inner glass pane 2 . In the embodiment shown in FIGS. 1 and 2 , the masking layer 4 is designed as a first opaque cover print which is arranged on the inner side surface II of the outer glass pane 1 and is only arranged on the part of the composite glass pane 100 adjoining the lower edge U. in the edge area. The vitreous glass pane 6 is arranged in a region of the composite glass pane 100 which, when viewed vertically through the composite glass pane 100 , lies entirely in the region in which the masking layer 4 is arranged. The outer dimensions of the vitreous pane 6 are therefore smaller than the inner pane 2 . The outer surface V of the vitreous pane 6 is bonded to the inner surface IV of the inner pane 2 by means of an adhesive layer 5 . In the embodiment shown in FIG. 2 , a reflective layer 7 for reflecting light is arranged on the inner surface VI of the vitreous glass pane 6 .

The vitreous glass pane 6 consists, for example, of aluminosilicate glass and has a thickness of 70 μm. The thermoplastic intermediate layer 3 comprises, for example, PVB and has a thickness of 0.76 mm. The outer glass pane 1 consists, for example, of soda lime glass and has a thickness of 2.1 mm. The inner pane 2 consists, for example, of soda lime glass and has a thickness of 1.6 mm.

The adhesive layer 5 is, for example, an optically transparent adhesive.

The reflective layer 7 is, for example, a metal layer with a thickness of 100 nm and contains aluminum.

In the embodiment shown in FIGS. 1 and 2 , the masking layer 4 extends between the two side edges S of the composite glass pane 100 and has, for example, a width of 30 cm starting from the lower edge U of the composite glass pane 100 .

It should be understood that the composite glass pane 100 may have any suitable geometry and/or curvature. Typically, composite glass pane 100 is a curved composite glass pane.

FIG. 3 shows a section through another embodiment of a composite glass pane 100 according to the invention. The embodiment shown in section in FIG. 3 differs from the embodiment shown in FIG. 2 only in that a protective layer is additionally applied over the entire surface of the reflective layer 7 applied on the inner surface VI of the vitreous glass pane 6. 8. The protective layer 8 is, for example, a polymer based on polyacrylates, polyoximes, alkyds, polyurethanes or mixtures thereof. Protective layer 8 has a thickness of, for example, 500 nm.

FIG. 4 shows a section through another embodiment of a composite glass pane 100 according to the invention. The embodiment shown in section in FIG. 4 differs from the embodiment shown in FIG. 2 only in that the masking layer 4 is not designed as a first opaque cover print arranged on the inner side surface II of the outer glass pane 1, but Designed as a first opaque cover print arranged on the outer side surface III of the inner pane 2 .

FIG. 5 shows a section through another embodiment of a composite glass pane 100 according to the invention. The embodiment shown in section in FIG. 5 differs from the embodiment shown in FIG. 3 only in that the masking layer 4 is not designed as a first opaque cover print arranged on the inner side surface II of the outer glass pane 1, but is a first opaque cover print designed to be placed on the outer side surface III of the inner glass pane 2 .

FIG. 6 shows a section through another embodiment of a composite glass pane 100 according to the invention. The embodiment shown in section in FIG. 6 differs from the embodiment shown in FIG. 2 only in that the masking layer 4 is not designed as a first opaque covering print arranged on the inner side surface II of the outer glass pane 1, but is an opaque colored area designed as a thermoplastic interlayer 3 .

FIG. 7 shows a section through another embodiment of a composite glass pane 100 according to the invention. The embodiment shown in section in FIG. 7 differs from the embodiment shown in FIG. 3 only in that the masking layer 4 is not designed as a first opaque covering print arranged on the inner side surface II of the outer glass pane 1, but is an opaque colored area designed as a thermoplastic interlayer 3 .

FIG. 8 shows a section through another embodiment of a composite glass pane 100 according to the invention. The embodiment shown in section in FIG. 8 differs from the embodiment shown in FIG. 2 only in that the reflective layer 7 is not arranged on the inner surface VI of the vitreous glass pane 6 but on the vitreous glass pane 6 on the outer surface V. Optionally, a protective layer can also be arranged directly adjacent to the adhesive layer 5 on the reflective layer 7 in this exemplary embodiment.

FIG. 9 shows a section through another embodiment of a composite glass pane 100 according to the invention. The embodiment shown in section in FIG. 9 differs from the embodiment shown in FIG. 2 only in that, in addition to the reflective layer 7 arranged on the inner surface VI of the vitreous glass pane 6 , the vitreous glass pane A reflective layer 7 is arranged on the outer surface V of 6 .

FIG. 10 shows a section through another embodiment of a composite glass pane 100 according to the invention. The embodiment shown in section in FIG. 10 differs from the embodiment shown in FIG. 9 only in that a protective layer 8 is additionally applied on the reflective layer 7 applied on the inner surface VI of the vitreous pane 6 . The protective layer 8 is, for example, a polymer based on polyacrylates, polyoximes, alkyds, polyurethanes or mixtures thereof. Protective layer 8 has a thickness of, for example, 500 nm. Optionally, in this embodiment a further protective layer can additionally be arranged directly adjacent to the adhesive layer 5 on the reflective layer 7 applied on the outer surface V of the vitreous glass pane 6 .

FIG. 11 shows a section through another embodiment of a composite glass pane 100 according to the invention. The embodiment shown in section in FIG. 11 differs from the embodiment shown in FIG. 2 only in that the composite glass pane 100 additionally has a second opaque cover print 9 applied on the inner side surface IV of the inner glass pane 2 . In the embodiment shown in FIG. 11 , the second opaque cover print 9 is designed as a frame.

FIG. 12 shows a section through another embodiment of a composite glass pane 100 according to the invention. The embodiment shown in section in FIG. 12 differs from the embodiment shown in FIG. 3 only in that the composite glass pane 100 additionally has a second opaque cover print 9 applied on the inner side surface VI of the inner glass pane 2 . In the embodiment shown in FIG. 12, the second opaque cover print 9 is designed as a frame.

FIG. 13 shows a section through another embodiment of a composite glass pane 100 according to the invention. The embodiment shown in section in FIG. 13 differs from the embodiment shown in FIG. 8 only in that the composite glass pane 100 additionally has a second opaque cover print 9 applied on the inner side surface IV of the inner glass pane 2 . In the embodiment shown in FIG. 13, the second opaque cover print 9 is designed as a frame.

FIG. 14 shows a section through another embodiment of a composite glass pane 100 according to the invention. The embodiment shown in section in FIG. 14 differs from that shown in FIG. 9 only in that the composite glass pane 100 additionally has a second opaque cover print 9 applied on the inner side surface IV of the inner glass pane 2 . In the embodiment shown in FIG. 14, the second opaque cover print 9 is designed as a frame.

FIG. 15 shows a section through another embodiment of a composite glass pane 100 according to the invention. The embodiment shown in section in FIG. 15 differs from the embodiment shown in FIG. 10 only in that the composite glass pane 100 additionally has a second opaque cover print 9 applied on the inner side surface IV of the inner glass pane 2 . In the embodiment shown in FIG. 15, the second opaque cover print 9 is designed as a frame.

Figure 16 shows a section through an embodiment of a projection device 101 according to the invention. A projection device 101 shown in FIG. 16 includes a composite glass plate 100 and an imaging unit 10 .

The composite glass pane 100 is designed as shown in FIG. 2 and comprises an outer glass pane 1 having an outer surface I and an inner surface II, an inner glass pane 2 having an outer surface III and an inner surface IV, a thermoplastic interlayer 3, a masking layer 4, glue An adhesive layer 5 and a vitreous glass pane 6 having an outer surface V and an inner surface VI. The thermoplastic interlayer 3 is arranged between the outer glass pane 1 and the inner glass pane 2, the inner glass pane 2 is arranged between the outer glass pane 1 and the vitreous glass pane 6, and the adhesive layer 5 is arranged between the inner glass pane 2 and the vitreous glass between plates 6. The outer glass pane 1 , the thermoplastic interlayer 3 and the inner glass pane 2 lie on top of each other over the entire surface. The masking layer 4 is arranged in a region of the composite glass pane 100 between the outer glass pane 1 and the inner glass pane 2 . The masking layer 4 is designed as a first opaque cover print which is arranged on the inner side surface II of the outer glass pane 1 and is only arranged in the edge region of the composite glass pane 100 adjoining the lower edge. The vitreous glass pane 6 is arranged in a region of the composite glass pane 100 which, when viewed vertically through the composite glass pane 100 , lies entirely in the region in which the masking layer 4 is arranged. The outer dimensions of the vitreous pane 6 are therefore smaller than the inner pane 2 . The outer surface V of the vitreous pane 6 is bonded to the inner surface IV of the inner pane 2 by means of an adhesive layer 5 . In the embodiment shown in FIG. 16 , a reflective layer 7 for reflecting light is arranged on the inner surface VI of the vitreous glass pane 6 .

The vitreous glass pane 6 consists, for example, of aluminosilicate glass and has a thickness of 70 μm. The thermoplastic intermediate layer 3 comprises, for example, PVB and has a thickness of 0.76 mm. The outer glass pane 1 consists, for example, of soda lime glass and has a thickness of 2.1 mm. The inner pane 2 consists, for example, of soda lime glass and has a thickness of 1.6 mm.

The adhesive layer 5 is, for example, an optically transparent adhesive.

The reflective layer 7 is, for example, a metal layer with a thickness of 100 nm and contains aluminum.

For example, the composite glass pane 100 is a windshield pane of a motor vehicle.

The projection device 101 has an imaging unit 10 . The imaging unit 10 is used to generate p-polarized and/or s-polarized light (image information), which is directed towards the reflective layer 7 and is reflected by the reflective layer 7 as reflected light into the vehicle interior, where it can be viewed by an observer, e.g. driver perception. The reflective layer 7 is designed to be suitable for reflecting the light from the imaging unit 10, ie the image formed by the light of the imaging unit. The light impinges on reflective layer 7 preferably at an angle of incidence of 55° to 80°, in particular 62° to 77°. The imaging unit 10 is, for example, a display, in particular an LCD display.

Figure 17 shows a top view of one embodiment of a composite glass pane 100 according to the present invention, and Figure 18 shows a section through the composite glass pane 100 shown in Figure 17 along cut line Y-Y'. The composite glass pane 100 shown in Figures 17 and 18 has an upper edge O, a lower edge U and two side edges S and comprises an outer glass pane 1 with an outer surface I and an inner surface II, an outer surface III and an inner surface IV An inner glass pane 2, a thermoplastic interlayer 3, a masking layer 4, an adhesive layer 5 and a vitreous glass pane 6 having an outer surface V and an inner surface VI. The thermoplastic interlayer 3 is arranged between the outer glass pane 1 and the inner glass pane 2, the inner glass pane 2 is arranged between the outer glass pane 1 and the vitreous glass pane 6, and the adhesive layer 5 is arranged between the inner glass pane 2 and the vitreous glass between plates 6. The outer glass pane 1 , the thermoplastic interlayer 3 and the inner glass pane 2 lie on top of each other over the entire surface. The masking layer 4 is arranged in a region of the composite glass pane 100 between the outer glass pane 1 and the inner glass pane 2 . The region in which the masking layer 4 is arranged is provided with the reference A. In the embodiment shown in FIGS. 17 and 18 , the masking layer 4 is designed as a first opaque cover print which is arranged on the inner side surface II of the outer glass pane 1 and is arranged in a surrounding edge region which is in contact with the reflective layer. 7 Overlapping segments have a greater width than segments differing therefrom. For simplicity of illustration, the masking layer is not shown black in Figure 17, but is patterned. The vitreous glass pane 6 is arranged in a region of the composite glass pane 100 which, when viewed vertically through the composite glass pane 100 , lies entirely in the region in which the masking layer 4 is arranged and is assigned the reference numerals in FIG. 17 b. The outer dimensions of the vitreous pane 6 are therefore smaller than the inner pane 2 . The outer surface V of the vitreous pane 6 is bonded to the inner surface IV of the inner pane 2 by means of an adhesive layer 5 . In the embodiment shown in FIG. 18 , a reflective layer 7 for reflecting light is arranged on the inner surface VI of the vitreous glass pane 6 .

The vitreous glass pane 6 consists, for example, of aluminosilicate glass and has a thickness of 70 μm. The thermoplastic intermediate layer 3 comprises, for example, PVB and has a thickness of 0.76 mm. The outer glass pane 1 consists, for example, of soda lime glass and has a thickness of 2.1 mm. The inner pane 2 consists, for example, of soda lime glass and has a thickness of 1.6 mm.

The adhesive layer 5 is, for example, an optically transparent adhesive.

The reflective layer 7 is, for example, a metal layer with a thickness of 100 nm and contains aluminum.

It should be understood that the composite glass pane 100 may have any suitable geometry and/or curvature. Typically, composite glass pane 100 is a curved composite glass pane.

Figure 19 shows an embodiment of the method according to the invention using a flowchart.

In a first step S1, a composite body is provided made of an outer glass pane 1 having an outer surface I and an inner surface II, a thermoplastic interlayer 3 and an inner glass pane 2 having an outer surface III and an inner surface IV, wherein the thermoplastic interlayer A layer 3 is arranged between the outer glass pane 1 and the inner glass pane 2 and a masking layer 4 is arranged in a region between the outer glass pane 1 and the inner glass pane 2 .

In a second step S2, a vitreous glass pane 6 is provided having an outer surface V and an inner surface VI, wherein on the outer surface V of the vitreous glass pane 6 and/or on the inner surface VI of the vitreous glass pane 6 is arranged A reflective layer 7 for reflecting light.

In a third step S3, the vitreous glass pane 6 is bonded to the inner glass pane 2 of the composite body via an adhesive layer 5 to form a composite glass pane 100 such that the vitreous glass pane 6 is arranged in one region of the composite glass pane 100 , this region, when viewed vertically through the composite glass pane 100 , lies entirely in the region in which the masking layer 4 is arranged.

Steps S1 and S2 can also be performed in reverse order or simultaneously.

List of reference signs:

100 composite glass panels

101 projection device

1 outer glass panel

2 inner glass panels

3 thermoplastic interlayer

4 masking layer

5 adhesive layer

6 vitreous panes

7 reflective layer

8 layers of protection

9 Second opaque overlay print

10 imaging unit

O the upper edge of the composite glass panel 100

U Lower edge of the composite glass pane 100

S the side edge of the composite glass pane 100

I Outer surface of the outer glass pane 1

II inner side surface of outer glass pane 1

III External surface of inner glass plate 2

IV The inside surface of the inner glass plate 2

V outside surface of vitreous glass plate 6

VI The inside surface of the vitreous glass plate 6

A area in which the masking layer 4 is arranged

B Area in which the vitreous glass pane 6 is arranged

X′-X cutting line

Y-Y′ cutting line.

Claims (15)

1. A composite glass sheet (100) comprising at least

An outer glass pane (1) having an outer side surface (I) and an inner side surface (II),

a thermoplastic intermediate layer (3),

an inner glass pane (2) having an outer side surface (III) and an inner side surface (IV),

-a masking layer (4),

an adhesive layer (5),

a vitreous glass plate (6) having an outer side surface (V) and an inner side surface (VI) and a thickness of 20 μm to 500 μm,

wherein the inner glass pane (2) is arranged between the outer glass pane (1) and the vitreous glass pane (6),

a thermoplastic interlayer (3) is arranged between the outer glass pane (1) and the inner glass pane (2),

the masking layer (4) is arranged between the outer glass pane (1) and the inner glass pane (2) in a region of the composite glass pane (100),

the adhesive layer (5) is arranged between the inner glass plate (2) and the vitreous glass plate (6),

a reflective layer (7) for reflecting light is arranged on an outer side surface (V) of the vitreous glass plate (6) and/or on an inner side surface (VI) of the vitreous glass plate (6),

and wherein the vitreous glass plate (6) is arranged in a region of the composite glass plate (100) which, when seen vertically through the composite glass plate (100), is entirely located in the region in which the masking layer (4) is arranged.

2. The composite glass sheet (100) according to claim 1, wherein the vitreous glass sheet (6) has a thickness of 50 μm to 300 μm, preferably 50 μm to 100 μm.

3. The composite glass pane (100) according to claim 1 or 2, wherein the reflective layer (7) reflects at least 10%, preferably at least 50%, particularly preferably at least 80%, in particular at least 90% of visible light.

4. A composite glass sheet (100) according to any of claims 1 to 3, wherein the reflective layer (7) is a metal layer.

5. The composite glass pane (100) according to any one of claims 1 to 4, wherein the reflective layer (7) comprises or consists of aluminum, titanium and/or nickel, in particular aluminum.

6. The composite glass pane (100) according to any one of claims 1 to 5, wherein the masking layer (4) is designed to surround in a frame-like manner and has a greater width, in particular in the region overlapping the reflective layer (7), than in the region differing therefrom.

7. The composite glass pane (100) according to any one of claims 1 to 6, wherein the masking layer (4) is designed as a first opaque overlay print arranged on the inner side surface (II) of the outer glass pane (1) or the outer side surface (III) of the inner glass pane (2).

8. The composite glass sheet (100) according to any of claims 1 to 6, wherein the masking layer (4) is designed as an opaque coloured region of the thermoplastic interlayer (3).

9. The composite glass pane (100) according to any one of claims 1 to 8, wherein the composite glass pane (100) additionally has a second opaque overlay print (9) arranged on the inner side surface (IV) of the inner glass pane (2) at least in the region in which the vitreous glass pane (6) is arranged.

10. The composite glass pane (100) according to any of claims 1 to 9, wherein a reflective layer (7) for reflecting light is arranged on an inner side surface (VI) of the glass pane (6) or a reflective layer (7) for reflecting light is arranged on an outer side surface (V) of the glass pane (6) and on an inner side surface (VI) of the glass pane (6),

and wherein a protective layer (8) is arranged at least on the reflective layer (7) arranged on the inner side surface (VI) of the vitreous glass plate (6).

11. The composite glass sheet (100) according to any one of claims 1 to 10, wherein the adhesive layer (5) is a thermoplastic layer or an Optically Clear Adhesive (OCA).

12. The composite glass sheet (100) according to any of claims 1 to 11, wherein the composite glass sheet (100) is a curved composite glass sheet.

13. Projection device (101) comprising at least

Composite glass pane (100) according to any of claims 1 to 12,

-an imaging unit (10) directed towards the reflective layer (7).

14. Method of manufacturing a composite glass sheet (100) according to any of claims 1 to 12, comprising at least

a) Providing a composite made of an outer glass plate (1) having an outer side surface (I) and an inner side surface (II), a thermoplastic interlayer (3) and an inner glass plate (2) having an outer side surface (III) and an inner side surface (IV), wherein the thermoplastic interlayer (3) is arranged between the outer glass plate (1) and the inner glass plate (2) and a masking layer (4) is arranged in one region between the outer glass plate (1) and the inner glass plate (2);

b) Providing a vitreous glass plate (6) having an outer side surface (V) and an inner side surface (VI), wherein a reflective layer (7) for reflecting light is arranged on the outer side surface (V) of the vitreous glass plate (6) and/or on the inner side surface (VI) of the vitreous glass plate (6);

c) The vitreous glass plate (6) is joined to the inner glass plate (2) of the composite body by means of an adhesive layer (5) to form a composite glass plate (100) such that the vitreous glass plate (6) is arranged in a region of the composite glass plate (100) which, when seen vertically through the composite glass plate (100), is entirely located in the region in which the masking layer (4) is arranged.

15. Use of a composite glass sheet (100) according to any one of claims 1 to 12 as a vehicle glass sheet in an amphibious vehicle, in particular in a motor vehicle, in particular as a windscreen sheet for a head-up display.