CN116547141A

CN116547141A - Composite glass pane with locally applied reflective layer

Info

Publication number: CN116547141A
Application number: CN202280006008.1A
Authority: CN
Inventors: A·戈默; V·舒尔茨; B·恩吉姆
Original assignee: Saint Gobain Glass France SAS
Current assignee: Saint Gobain Glass France SAS
Priority date: 2021-12-02
Filing date: 2022-11-22
Publication date: 2023-08-04
Also published as: DE202022002949U1; WO2023099281A1

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, to a method for the production thereof, to the use thereof, and to a projection device.

Modern automobiles are increasingly equipped with so-called heads-up displays (HUDs). The image is projected onto the windscreen by a projector, typically located in the dashboard area, where it is reflected and perceived by the driver as a virtual image (from his perspective) behind the windscreen. Thus, important information, such as current driving speed, navigation or warning indication, can be projected into the driver's field of view, which the driver can perceive without having to take the line of sight away from the lane. Thus, head-up displays may significantly contribute to improving traffic safety.

HUD projection devices are disclosed in JP H09 43530A, US 2009/295681 A1, WO 2021/145387A1, US 2019/285882A1, EP 3 429 844 81 and CN 113 238 377A.

However, a problem with head-up displays is often that the area of the windscreen which is provided for reflecting the light projected by the projector must have a high transparency, typically at least 70%. Thus, the reflected projector light is superimposed with light from the external environment, which depending on the light conditions may lead to a reduced contrast of the virtual image and thus to poor visual perceptibility of the driver. In all weather and light conditions, sufficient visual perceptibility of safety-relevant information, such as lane assistance, speed display or engine revolutions, should be ensured. It would therefore be desirable to have a projection device based on heads-up display technology in which unwanted secondary images do not occur and whose arrangement can be realized relatively easily while having good recognizability and sufficient brightness and contrast of the image information shown. To achieve this, the contrast in the reflective area of the windshield plate must be increased. The contrast increase may be achieved, for example, by making the background of the reflective area largely or completely opaque. However, this solution requires that the reflective layer is applied only in a locally limited area of the windscreen plate.

The application of the metallic reflective coating on the vitreous glass plate is generally 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 glass plate is coated with atoms released from a target in an evacuated chamber. The atoms here move through the chamber onto the glass sheet under the guidance of an electric field. Thus, they move from the cathode to the anode where the target is arranged. With the vitreous glass plate disposed between the cathode and the anode, a layer is formed on the vitreous glass plate. In the case of magnetron sputtering, an additional magnetic field is arranged behind the cathode, which results in faster layer growth and a denser, i.e. lower porosity, layer. Methods for coating vitreous glass sheets using sputtering are known, for example, from WO 9900528A1, DE 10126868C1 and WO 2017198363 A1.

Magnetron sputtering is therefore also suitable for coating glass panes, since, unlike many other coating techniques, it can also be used in the case of bent glass panes, for example in the case of glass panes provided for the vehicle industry. However, sputtering has the disadvantage that it is not possible to selectively coat only specific surface areas without special precautions, but only the entire surface is always coated. Selective coating of only specific surface areas can be achieved, for example, by complex masking of areas that should not be coated.

Cold gas spraying is also suitable for methods 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 a carrier at a very high rate. Methods for coating by cold gas spraying are known, for example, from WO 2010/003396A1, EP 3845685A1 and EP 2 902 A1.

WO 2019/186495A1 discloses a composite glass with at least one stepped functional section comprising two stacks of components, namely a main stack of components in which a change in their properties is not desired, and a second stack of components comprising functional layers. The functional layer may be selected from switchable films, switchable layers, displays, lighting devices, touch sensitive layers, sensor layers, light 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 sheet with a locally applied reflective layer. In particular, the composite glass sheet should be easy to manufacture.

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

The composite glass sheet according to the present invention includes an outer glass sheet, a thermoplastic interlayer, a masking layer, an inner glass sheet, an adhesive layer, and a vitreous glass sheet. A thermoplastic interlayer is disposed between the outer glass sheet and the inner glass sheet, and an adhesive layer is disposed between the inner glass sheet and the vitreous glass sheet. According to the present invention, the masking layer is disposed in one region of the composite glass sheet, and the vitreous glass sheet is disposed in one region of the composite glass sheet, which is entirely located in the region in which the masking layer is disposed when vertically seen through the composite glass sheet.

The composite glass sheet is arranged to isolate the interior space from the external environment in a window opening of a vehicle. In the context of the present invention, an inner glass sheet refers to a glass sheet of a composite glass sheet facing the interior space of a vehicle. The outer glass sheet refers to a glass sheet facing the external environment.

The composite glass sheet has, in particular, an upper edge and a lower edge, and two side edges extending therebetween. The upper edge refers to an edge that is arranged to be directed upwards in the mounted position. The lower edge refers to an edge that is arranged to be directed downwards in the mounted position. In the case of a windshield panel, the upper edge is commonly referred to as the top edge and the lower edge is referred to as the engine edge.

The outer glass sheet, the inner glass sheet, and the vitreous glass sheet 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, the outer side surface refers to a main surface which is arranged to face the external environment in the mounted position. In the context of the present invention, the inner side surface refers to a main surface which is arranged to face the inner space in the mounted position. The inner side surface of the outer glass sheet and the outer side surface of the inner glass sheet face each other and are joined to each other by a thermoplastic interlayer.

The outer surface of the outer glass sheet is referred to as the I-plane. The inner side surface of the outer glass sheet is referred to as the II-side. The outer side surface of the inner glass sheet is referred to as the III-plane. The inner side surface of the inner glass sheet is referred to as the IV-face. The outer surface of the vitreous glass plate is referred to as the V-face. The inside surface of the vitreous glass plate is referred to as the VI face.

It should be appreciated that the inner glass sheet is disposed between the outer glass sheet and the vitreous glass sheet. The inner side surface of the outer glass plate and the outer side surface of the inner glass plate face each other. The inner side surface of the inner glass sheet and the outer side surface of the vitreous glass sheet face each other.

According to the invention, the vitreous glass plate has a thickness of 20 μm (micrometers) to 500 μm. Thus, a vitreous glass plate is a glass plate made of ultra-thin glass. Such glass sheets made of ultra-thin glass are flexible and can be adapted to the bending of the glass sheets.

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

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

Since the glass pane is arranged in a region of the composite pane which is located entirely in the region in which the masking layer is arranged when viewed vertically through the composite pane, the reflective layer applied to the glass pane is also arranged in a region which is located entirely in the region in which the masking layer is arranged when viewed vertically through the composite pane. Thus, the reflective layer is arranged to overlap or overlap the masking layer when perpendicularly transmitted through or orthogonally projected onto the composite glass sheet. The reflective layer is thus free of sections which do not overlap the masking layer, i.e. the reflective layer is only designed to be located in front of the masking layer when looking towards the inside of the composite glass pane.

In a preferred embodiment of the composite glass sheet according to the invention, the vitreous glass sheet 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 opaque, which in the context of the present invention means that it has an average transmission in the visible spectral range of preferably at most 80%, particularly preferably at most 50%, in particular 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 proportion, but may reflect p-polarized light and s-polarized light to varying degrees.

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

Here, the term polarization direction refers to the plane of incidence of 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 vector of incidence and the surface normal of the composite glass sheet at the geometric center of the illuminated area.

In other words, the polarization, i.e. 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 may be curved (for example when it is designed as a windscreen pane), which influences the plane of incidence of the radiation of the image display device, a slightly different polarization ratio from it may occur in other areas, which is unavoidable for physical reasons.

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

The reflective layer preferably contains at least one metal 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, palladium, ruthenium, or mixtures thereof. Aluminum, titanium, and/or nickel are preferred because they can have high reflectivity for p-polarized light or s-polarized light. Aluminum is particularly preferred.

The thickness of the reflective layer is preferably from 10nm (nanometers) to 100 μm (micrometers), particularly preferably from 50nm to 50 μm, in particular from 100nm to 5 μm.

In a particular embodiment of the invention, the reflective layer is a coating comprising a stack of thin layers, i.e. a sequence of thin monolayers. The thin layer stack comprises one or more conductive layers based on nickel, titanium and/or aluminum. The conductive layer based on nickel, titanium and/or aluminum gives the reflective layer basic reflective properties and in addition IR reflecting effects and conductivity. The conductive layer is formed based on nickel, 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 aluminum, nickel and/or titanium based layer may have a dopant such as palladium, gold, copper or silver. Materials based on aluminum, nickel and/or titanium are particularly suitable for reflecting light, with p-polarized light being particularly preferred. The use of nickel, titanium and/or aluminum in the metal coating has proven to be particularly advantageous for reflecting 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 10nm to 1 μm. The thin-layer stack preferably has 2 to 20 monolayers, in particular 5 to 10 monolayers.

As described above, in the composite glass sheet according to the present invention, the masking layer is disposed in one region of the composite glass sheet. The masking layer is preferably arranged in an edge region of the composite glass pane, which edge region is generally contiguous to the glass pane edge of the glass pane. A great advantage of this arrangement results when the composite glass pane is used as a windscreen in a vehicle, since the masking layer is arranged in an edge region outside the main perspective region of the driver.

The masking layer is preferably arranged at least along and adjoining the lower edge. In a top view of the composite glass sheet, rectangular opaque strips arranged along the lower edge thus appear.

In a particularly preferred embodiment of the composite glass pane according to the invention, the masking layer is designed as a frame-like surround. In the section in which the vitreous glass plate and thus the reflective layer applied thereto are arranged overlapping the masking layer, the masking layer designed in the form of a frame is preferably provided with a widening, i.e. with a greater width (perpendicular to the extension) than in the other sections. In this way, the masking layer can be suitably adapted to the dimensions of the vitreous glass plate on which the reflecting layer is applied.

In one embodiment, the masking layer is thus designed to surround in a frame-like manner and has a greater width, in particular in the region overlapping the vitreous glass plate, than in the region differing therefrom.

The vitreous glass plate on which the reflecting layer is applied preferably has a substantially rectangular shape, which extends between the two side edges in the region near the lower edge. It is particularly preferred that the edges of the vitreous glass plate do not reach the side edges and the lower edge, but are spaced apart therefrom, for example by 2cm to 5cm.

A masking layer in the context of the present invention is a layer that prevents transmission through the composite glass sheet. Here, 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 may also be a colored region of the thermoplastic intermediate layer. According to a preferred embodiment of the composite glass sheet, 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 for the masking layer has to be designed.

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

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

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

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

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

Masking layers designed as opaque colored regions of a thermoplastic interlayer can also be achieved by using a thermoplastic interlayer composed of an opaque thermoplastic film and a transparent thermoplastic film. The opaque thermoplastic film and the transparent thermoplastic film are preferably arranged offset from each other such that the two films do not overlap when viewed through the composite glass sheet. The transparent and opaque films are composed of or preferably comprise the same plastic. Materials based on which opaque and transparent films can be formed are those materials also described for the thermoplastic interlayer. The opaque film is preferably a coloured film, which may have a different colour, in particular black.

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

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

In another preferred embodiment of the composite glass sheet according to the invention, a reflective layer for reflecting light is arranged on both the inner side surface of the vitreous glass sheet and on the outer side surface of the vitreous glass sheet, respectively, and a protective layer is arranged on that reflective layer which is arranged on the inner side surface of the vitreous glass sheet. For the reflective layer arranged on the outer side surface of the vitreous glass plate, no protective layer is required, since the reflective layer is bonded to the inner glass plate by means of an adhesive layer and is thus protected. However, optionally, a protective layer may also be arranged on the reflective layer arranged on the outer side surface of the vitreous glass plate.

The protective layer is preferably transparent and planar, in particular congruently applied to the reflective layer. The protective layer is preferably a polymer based on polyacrylate, polyoxime, alkyd, polyurethane or mixtures thereof. The thickness of the protective layer is preferably 50nm to 10. Mu.m, more preferably 100nm to 5. Mu.m.

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. By means of this protective layer, fewer metal particles are separated out over time and the reflective layer of the vitreous glass plate retains its shape for a longer time.

In a particularly preferred embodiment of the invention, the protective layer is an easy-to-clean layer and/or an "anti-fingerprint" layer. By "easy-to-clean layer" in the context of the present invention is meant that dirt on the protective layer, for example in the form of fingerprints, oil stains and dirt particles, can be removed from the protective layer by using a cloth, preferably a microfiber cloth. Thus, grease or abrasive cleaners and solvents, such as those based on alcohols, are substantially avoided from dissolving during cleaning of the protective layer. In the context of the present invention, an "anti-fingerprint" layer refers to a layer where the fingerprint attached to the protective layer is hardly or not at all visually perceptible. Fingerprints are in particular the fat-containing components of a human finger that may remain on the touch surface and create an aesthetically undesirable effect.

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, with PVB being particularly preferred. The thermoplastic layer is generally formed of a thermoplastic film (tie film). The thickness of the thermoplastic layer is preferably from 0.2mm to 2mm, particularly preferably from 0.3mm to 1mm, for example 760 μm. The thermoplastic layer may be formed from a single film or more than one film.

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

The thermoplastic interlayer used to join the outer and inner glass sheets comprises at least one thermoplastic polymer, preferably Ethylene Vinyl Acetate (EVA), polyvinyl butyral (PVB) or Polyurethane (PU) or mixtures or copolymers or derivatives thereof, with PVB being particularly preferred. The thermoplastic intermediate layer is typically formed of a thermoplastic film (tie film). The thickness of the thermoplastic intermediate layer is preferably from 0.2mm to 2mm, particularly preferably from 0.3mm to 1mm, for example 760 μm. The thermoplastic interlayer may be formed from a single film or more than one film. The thermoplastic intermediate layer may also be a film having functional properties, such as a film having acoustic damping properties.

The outer glass pane and the inner glass pane 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, polymethyl methacrylate, polystyrene, polyamide, polyester, polyvinyl chloride and/or mixtures thereof.

The outer and inner glass sheets may be transparent and colorless, or may be colored or tinted. In a preferred embodiment, the total transmission through a composite glass pane designed as a windshield pane is greater than 70% (light type a) in the main perspective region. The term total transmittance is based on the method specified by ECE-R43, appendix 3, section 9.1 for testing the transmittance of motor vehicle glass panels. The outer glass sheet and the inner glass sheet may be unstressed, partially prestressed or prestressed independently of each other. If at least one of the glass sheets should have a pre-stress, this may be a thermal or chemical pre-stress.

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

The vitreous glass sheet preferably comprises or consists of aluminosilicate glass, borosilicate glass, aluminoborosilicate glass. The vitreous glass sheet may be pre-stressed, partially pre-stressed or non-pre-stressed.

The composite glass sheet according to the invention may comprise one or more additional interlayers, in particular functional interlayers. The additional intermediate layer may in particular be an intermediate layer having acoustic damping properties, an intermediate layer that reflects infrared radiation, an intermediate layer that absorbs UV radiation, an intermediate layer that is at least partially coloured and/or an intermediate layer that is at least partially coloured. If there are a plurality of additional intermediate layers, they may 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 to a reflective layer.

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

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

Wherein 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, the reflective layer for reflecting light is arranged on the outer side surface of the vitreous glass plate and/or on the inner side surface of the vitreous glass plate,

and wherein the vitreous glass plate is arranged in a region of the composite glass plate which, when vertically transparent through the composite glass plate, is entirely located in a 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 it from the perspective of the vehicle occupant results in good visibility of the image in the projection device according to the invention, even in the case of external solar radiation and when using a low-light imaging unit. Even in these cases, the image formed by the imaging unit appears bright and is extremely well identifiable. This enables to reduce the power of the imaging unit and thus the power consumption.

From the perspective of the vehicle occupant, the reflective layer is spatially disposed in front of the masking layer when viewed through the inner glass pane. Thereby, the region of the composite glass sheet in which the reflective layer is disposed appears opaque. The expression "when seen through the composite glass sheet" means looking through the composite glass sheet from the inner side surface of the composite glass sheet. In the context of the present invention, "spatially forward" means that the reflective layer is disposed spatially farther from the outer surface of the outer glass sheet than the masking layer. Preferably, the masking layer is wider at least in the region that overlaps the reflective layer and in which the composite glass sheet is used to display an image. This means that the masking layer has a greater width in this region when viewed perpendicular to the nearest section of the surrounding edge of the composite glass pane than in the other sections. Thereby, the masking layer may be adapted to the dimensions of the reflective layer.

The imaging unit of the projection device emits light and is arranged near the inner side surface of the inner glass plate such that the imaging unit irradiates the surface, wherein the light is reflected by the reflective layer of the composite glass plate. 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 impinging on the reflective layer in the wavelength range from 400nm to 700nm and at an angle of incidence of from 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 for emitting an image and may therefore also be referred to as a projector, a display device or an image display device. For example, a display or other device known to those skilled in the art may also be used as the imaging unit. The imaging unit is preferably a display, particularly preferably an LCD display, an LED display, an OLED display or an electroluminescent display, in particular an LCD display. The mounting height of the display is low and thus easy and space-saving to integrate into the dashboard of the vehicle. Furthermore, the display operates significantly more energy-efficient than other imaging units. In the combination of the reflective layer according to the invention and the subsequent masking layer, the relatively low brightness of the display is completely sufficient here. The radiation from the imaging unit preferably impinges into the region of the reflective layer on the composite glass pane at an angle of incidence of 55 ° to 80 °, preferably 62 ° to 77 °. The angle of incidence is the angle between the incident vector of the radiation from the image display device and the surface normal at the geometric center of the reflective layer.

By arranging the reflective layer on the outer side surface and/or the inner side surface of a vitreous glass plate glued to the inner glass plate and having a thickness of 20 μm to 500 μm, the occurrence of disturbing ghosts is avoided.

In a projection device having a reflective layer disposed on an inner side surface of a vitreous glass plate, a desired virtual image is generated by reflection on the reflective layer and no ghost image occurs.

In projection devices having a reflective layer disposed on the outside surface of the glass pane, the desired virtual image is produced by reflection on the reflective layer, and in addition a second virtual image, the so-called phantom or "phantom", is also produced by reflection on the inside surface of the glass pane.

In a projection device having a reflective layer disposed on an outside surface of a vitreous glass plate and a reflective layer disposed on an inside surface of the vitreous glass plate, a first virtual image is generated by reflection on the reflective layer disposed on the outside surface of the vitreous glass plate, and further a second virtual image is generated on the reflective layer disposed on the inside surface of the vitreous glass plate.

However, at low thicknesses of the vitreous glass plate according to the invention, the spatial offset between the first virtual image and the phantom image or between the first virtual image and the second virtual image is sufficiently small to appear undisturbed. This effect is due to the typical angular visual acuity of the human eye: the shift between the first virtual image and the phantom image or between the first virtual image and the second virtual image caused by the thin glass pane according to the invention is no longer distinguishable to the human eye.

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

According to the invention there is also a method of manufacturing a composite glass sheet according to the invention comprising at least:

a) Providing a composite made of an outer glass sheet having an outer side surface and an inner side surface, a thermoplastic interlayer, and an inner glass sheet having an outer side surface and an inner side surface, wherein the thermoplastic interlayer is disposed between the outer glass sheet and the inner glass sheet, and a masking layer is disposed in a region between the outer glass sheet and the inner glass sheet;

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

c) The vitreous glass plate is joined with the inner glass plate of the composite body by an adhesive layer to form the composite glass plate such that the vitreous glass plate is disposed in a region of the composite glass plate that is entirely in a region in which the masking layer is disposed when vertically transparent through the composite glass plate.

Steps a) and b) may be performed in the order shown, simultaneously or in reverse order. Step c) is carried out after steps a) and b).

As described above, the vitreous glass plate is arranged in an area of the composite glass plate that is entirely located in an area in which the masking layer is arranged when vertically transmitted through the composite glass plate. Thus, the outer dimensions of the vitreous glass sheets are smaller than the outer and inner glass sheets of the composite glass sheet. Providing a glass sheet in step b) may be performed by applying a reflective layer on the entire inner side surface and/or outer side surface of an uncoated glass sheet having a desired size.

Alternatively, the provision of the glass pane in step b) can also be carried out by applying a reflective layer on the entire surface of the inner side surface and/or the outer side surface of the uncoated glass pane which is greater than desired in terms of its outer dimensions, i.e. width and length, and then cutting out a portion of such coated glass pane having the desired dimensions, for example by means of a laser cutting method.

By means of a vitreous glass plate provided with a reflecting layer, the reflecting layer can be selectively arranged in one region of the composite glass plate.

Providing a vitreous glass plate 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 jetting, for example using a pressure atomizer.

If the composite glass sheet should be curved, a curved outer glass sheet and a curved inner glass sheet are used in providing the composite in step a). The vitreous glass plate with the reflecting layer has flexibility due to the low thickness of the vitreous glass plate and is adapted to the curved inner glass plate of the composite in step c). This is an advantage of the method according to the invention. In the method according to the invention, the coating of the reflective layer takes place on a flat substrate.

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

In providing the vitreous glass plate in step b), the reflective layer may be applied by commonly known coating methods, such as magnetron sputtering or cold gas spraying.

The above-described preferred embodiments of the composite glass sheet according to the invention are correspondingly applicable also to the method of manufacturing the composite glass sheet 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 an amphibious vehicle, in particular in a motor vehicle, in particular as a windscreen pane for a head-up display.

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

Wherein:

figure 1 shows a top view of one embodiment of a composite glass sheet 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 sheet according to the invention,

figure 4 shows a cross section through another embodiment of a composite glass sheet according to the invention,

figure 5 shows a section through another embodiment of a composite glass sheet according to the invention,

figure 6 shows a section through another embodiment of a composite glass sheet according to the invention,

figure 7 shows a section through another embodiment of a composite glass sheet according to the invention,

figure 8 shows a section through another embodiment of a composite glass sheet according to the invention,

figure 9 shows a section through another embodiment of a composite glass sheet according to the invention,

figure 10 shows a section through another embodiment of a composite glass sheet according to the invention,

figure 11 shows a section through another embodiment of a composite glass sheet according to the invention,

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

figure 13 shows a section through another embodiment of a composite glass sheet according to the invention,

figure 14 shows a section through another embodiment of a composite glass sheet according to the invention,

figure 15 shows a section through another embodiment of a composite glass sheet according to the invention,

figure 16 shows a cross 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 sheet according to the invention,

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

fig. 19 shows an embodiment of the method according to the invention using a flow chart.

Fig. 1 shows a top view of one embodiment of a composite glass sheet 100 according to the present invention, and fig. 2 shows a section through the composite glass sheet 100 shown in fig. 1 along a cut line X-X'. The composite glass sheet 100 shown in fig. 1 and 2 has an upper edge O, a lower edge U, and two side edges S, and includes an outer glass sheet 1 having an outer side surface I and an inner side surface II, an inner glass sheet 2 having an outer side surface III and an inner side surface IV, a thermoplastic interlayer 3, a masking layer 4, an adhesive layer 5, and a vitreous glass sheet 6 having an outer side surface V and an inner side surface VI. The thermoplastic interlayer 3 is arranged between the outer glass plate 1 and the inner glass plate 2, the inner glass plate 2 is arranged between the outer glass plate 1 and the vitreous glass plate 6, and the adhesive layer 5 is arranged between the inner glass plate 2 and the vitreous glass plate 6. The outer glass pane 1, the thermoplastic interlayer 3 and the inner glass pane 2 are entirely superposed on one another. A masking layer 4 is arranged between the outer glass pane 1 and the inner glass pane 2 in one region of the composite glass pane 100. In the embodiment shown in fig. 1 and 2, 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 and is arranged only in the edge region of the composite glass pane 100 adjoining the lower edge U. 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. Thus, the outer dimensions of the vitreous glass plate 6 are smaller than the inner glass plate 2. The outer side surface V of the vitreous glass plate 6 is joined to the inner side surface IV of the inner glass plate 2 by the adhesive layer 5. In the embodiment shown in fig. 2, a reflective layer 7 for reflecting light is arranged on the inner side surface VI of the vitreous glass plate 6.

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

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

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

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

It should be appreciated that the composite glass sheet 100 can have any of a variety of suitable geometries and/or curvatures. Typically, the composite glass sheet 100 is a bent composite glass sheet.

Fig. 3 shows a cross section through another embodiment of a composite glass sheet 100 according to the invention. The embodiment shown in cross section in fig. 3 differs from the embodiment shown in fig. 2 only in that, furthermore, a protective layer 8 is applied over the entire surface of the reflective layer 7 applied on the inner side surface VI of the vitreous glass plate 6. The protective layer 8 is for example a polymer based on polyacrylate, polyoxime, alkyd, polyurethane or mixtures thereof. The protective layer 8 has a thickness of 500nm, for example.

Fig. 4 shows a cross section through another embodiment of a composite glass sheet 100 according to the invention. The embodiment shown in cross 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 overlay print arranged on the inner side surface II of the outer glass pane 1, but as a first opaque overlay print arranged on the outer side surface III of the inner glass pane 2.

Fig. 5 shows a cross section through another embodiment of a composite glass sheet 100 according to the invention. The embodiment shown in cross 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 overlay print arranged on the inner side surface II of the outer glass pane 1, but as a first opaque overlay print arranged on the outer side surface III of the inner glass pane 2.

Fig. 6 shows a cross section through another embodiment of a composite glass sheet 100 according to the invention. The embodiment shown in cross 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 overlay print arranged on the inner side surface II of the outer glass pane 1, but as an opaque colored region of the thermoplastic intermediate layer 3.

Fig. 7 shows a cross section through another embodiment of a composite glass sheet 100 according to the invention. The embodiment shown in cross 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 overlay print arranged on the inner side surface II of the outer glass pane 1, but as an opaque colored region of the thermoplastic intermediate layer 3.

Fig. 8 shows a cross section through another embodiment of a composite glass sheet 100 according to the invention. The embodiment shown in cross 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 side surface VI of the vitreous glass plate 6, but on the outer side surface V of the vitreous glass plate 6. Optionally, in this embodiment, a protective layer can also be arranged directly adjacent to the adhesive layer 5 on the reflective layer 7.

Fig. 9 shows a cross section through another embodiment of a composite glass sheet 100 according to the invention. The embodiment shown in cross section in fig. 9 differs from the embodiment shown in fig. 2 only in that the reflective layer 7 is arranged on the outer side surface V of the vitreous glass plate 6 in addition to the reflective layer 7 arranged on the inner side surface VI of the vitreous glass plate 6.

Fig. 10 shows a cross section through another embodiment of a composite glass sheet 100 according to the invention. The embodiment shown in cross section in fig. 10 differs from the embodiment shown in fig. 9 only in that, furthermore, a protective layer 8 is applied on the reflective layer 7 applied on the inner side surface VI of the vitreous glass plate 6. The protective layer 8 is for example a polymer based on polyacrylate, polyoxime, alkyd, polyurethane or mixtures thereof. The protective layer 8 has a thickness of, for example, 500 nm. Optionally, in this embodiment, a further protective layer can furthermore be arranged directly adjacent to the adhesive layer 5 on the reflective layer 7 applied on the outer side surface V of the vitreous glass plate 6.

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

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

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

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

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

Fig. 16 shows a cross section through an embodiment of a projection device 101 according to the invention. The projection apparatus 101 shown in fig. 16 includes a composite glass sheet 100 and an imaging unit 10.

The composite glass sheet 100 is designed as shown in fig. 2 and comprises an outer glass sheet 1 having an outer side surface I and an inner side surface II, an inner glass sheet 2 having an outer side surface III and an inner side surface IV, a thermoplastic interlayer 3, a masking layer 4, an adhesive layer 5, and a vitreous glass sheet 6 having an outer side surface V and an inner side surface VI. The thermoplastic interlayer 3 is arranged between the outer glass plate 1 and the inner glass plate 2, the inner glass plate 2 is arranged between the outer glass plate 1 and the vitreous glass plate 6, and the adhesive layer 5 is arranged between the inner glass plate 2 and the vitreous glass plate 6. The outer glass pane 1, the thermoplastic interlayer 3 and the inner glass pane 2 are superimposed over the whole surface of each other. A masking layer 4 is arranged between the outer glass pane 1 and the inner glass pane 2 in one region of the composite glass pane 100. 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 and is arranged only in the edge region of the composite glass pane 100 adjoining the lower edge. 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. Thus, the outer dimensions of the vitreous glass plate 6 are smaller than the inner glass plate 2. The outer side surface V of the vitreous glass plate 6 is joined to the inner side surface IV of the inner glass plate 2 by the adhesive layer 5. In the embodiment shown in fig. 16, a reflective layer 7 for reflecting light is arranged on the inner side surface VI of the vitreous glass plate 6.

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

For example, composite glass sheet 100 is a windshield sheet of an automotive vehicle.

The projection device 101 has an imaging unit 10. The imaging unit 10 serves to generate p-polarized light 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 space, where it can be perceived by an observer, for example a driver. The reflective layer 7 is designed to be suitable for reflecting light from the imaging unit 10, i.e. an image formed by the light of the imaging unit. The light impinges on the reflective layer 7 preferably with 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.

Fig. 17 shows a top view of one embodiment of a composite glass sheet 100 according to the present invention, and fig. 18 shows a section through the composite glass sheet 100 shown in fig. 17 along a cut line Y-Y'. The composite glass sheet 100 shown in fig. 17 and 18 has an upper edge O, a lower edge U, and two side edges S, and includes an outer glass sheet 1 having an outer side surface I and an inner side surface II, an inner glass sheet 2 having an outer side surface III and an inner side surface IV, a thermoplastic interlayer 3, a masking layer 4, an adhesive layer 5, and a vitreous glass sheet 6 having an outer side surface V and an inner side surface VI. The thermoplastic interlayer 3 is arranged between the outer glass plate 1 and the inner glass plate 2, the inner glass plate 2 is arranged between the outer glass plate 1 and the vitreous glass plate 6, and the adhesive layer 5 is arranged between the inner glass plate 2 and the vitreous glass plate 6. The outer glass pane 1, the thermoplastic interlayer 3 and the inner glass pane 2 are superimposed over the whole surface of each other. A masking layer 4 is arranged between the outer glass pane 1 and the inner glass pane 2 in one region of the composite glass pane 100. The region in which the masking layer 4 is arranged is provided with reference numeral a. In the embodiment shown in fig. 17 and 18, 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 and is arranged in a circumferential edge region which has a greater width in the region overlapping the reflective layer 7 than in the region differing therefrom. For simplicity of display, the masking layer is not shown in black in fig. 17, but is patterned. The vitreous glass plate 6 is arranged in a region of the composite glass plate 100 which is entirely located in a region in which the masking layer 4 is arranged when seen vertically through the composite glass plate 100, and is provided with reference sign B in fig. 17. Thus, the outer dimensions of the vitreous glass plate 6 are smaller than the inner glass plate 2. The outer side surface V of the vitreous glass plate 6 is joined to the inner side surface IV of the inner glass plate 2 by the adhesive layer 5. In the embodiment shown in fig. 18, a reflective layer 7 for reflecting light is arranged on the inner side surface VI of the vitreous glass plate 6.

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

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

In a second step S2, a vitreous glass plate 6 having an outer side surface V and an inner side surface VI is provided, 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.

In a third step S3, the vitreous glass plate 6 is joined with the inner glass plate 2 of the composite body by the adhesive layer 5 to form the composite glass plate 100, so that the vitreous glass plate 6 is arranged in a region of the composite glass plate 100 which is entirely located in a region in which the masking layer 4 is arranged when vertically transmitted through the composite glass plate 100.

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

List of reference numerals:

100. composite glass plate

101. Projection device

1. Outer glass plate

2. Inner glass plate

3. Thermoplastic interlayers

4. Masking layer

5. Adhesive layer

6. Vitreous glass plate

7. Reflective layer

8. Protective layer

9. Second opaque overlay print

10. Image forming unit

Upper edge of O-composite glass sheet 100

Lower edge of U-shaped composite glass sheet 100

Side edges of S-composite glass sheet 100

Outside surface of the I outer glass plate 1

II inner side surface of outer glass plate 1

Outside surface of inner glass pane 2

Inner side surface of IV inner glass pane 2

The outer side surface of the V-vitreous glass plate 6

Inner side surface of VI vitreous glass plate 6

A region in which the masking layer 4 is arranged

B region in which the vitreous glass plate 6 is arranged

X' -X cutting line

Y-Y' cut line.

Claims

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.