CN111417518A

CN111417518A - Composite glass pane with wedge-shaped cross section

Info

Publication number: CN111417518A
Application number: CN201980003526.6A
Authority: CN
Inventors: S.吉尔; V.舒尔茨; R.坎嫩吉泽
Original assignee: Saint Gobain Glass France SAS
Current assignee: Saint Gobain Glass France SAS; Compagnie de Saint Gobain SA
Priority date: 2018-11-05
Filing date: 2019-10-25
Publication date: 2020-07-14
Also published as: WO2020094420A1

Abstract

The invention relates to a composite glass pane (1) comprising an outer glass pane (2), an inner glass pane (3) and a thermoplastic intermediate layer (4) arranged between the outer glass pane (2) and the inner glass pane (3). The outer glass pane (2) and/or the inner glass pane (3) are formed in the form of flat glass produced in a float process and having a wedge-shaped cross section (5) and a plurality of elongate elevations (8) and elongate depressions (9) on the glass pane surfaces (12, 12'), the elevations (8) and depressions (9) extending in a first glass pane direction (R1) and being arranged alternately in a second glass pane direction (R2) perpendicular to the first glass pane direction (R1). The thermoplastic intermediate layer (4) is manufactured in an extrusion method, has a substantially constant thickness across the length and width, and has a plurality of elongated protrusions (10) and elongated recesses (11) on the surface (13, 13'), the protrusions (10) and recesses (11) extending along a third direction (R3) and being alternately arranged in a fourth direction (R4) perpendicular to the third direction (R3). The thermoplastic intermediate layer (4) is arranged in such a way that the elongate projections (10) of the thermoplastic intermediate layer (4) are arranged at an angle of 45 DEG to 90 DEG relative to the elongate projections (8) of the outer glass pane (2) and/or of the inner glass pane (3), wherein the outer glass pane (2) and/or the inner glass pane (3) are formed in the form of flat glass having a wedge-shaped cross section (5) produced in a float process.

Description

Composite glass pane with wedge-shaped cross section

The invention relates to a composite glass pane having a wedge-shaped cross section, to a method for the production thereof and to the use thereof.

Composite glass sheets are now used in many places, particularly in vehicle manufacturing. In this connection, the term transport means includes, in particular, road transport means, aircraft, watercraft, agricultural machines or operating equipment.

Composite glass sheets are also used in other fields. Mention may be made here, for example, of building glass or information displays, for example in museums or as advertising displays.

In this regard, a composite glass sheet typically has two glass sheets laminated to an interlayer. The glass sheet itself may have curvature and typically has a constant thickness. Typically, the interlayer has a thermoplastic, preferably polyvinyl butyral (PVB), of a predetermined thickness, for example 0.76 mm.

Since the composite glass sheet is typically tilted with respect to the viewer, a ghost image exists. These ghosting is due to the fact that incident light typically does not pass completely through both glass plates, but rather at least a portion of the light is reflected before passing through the second glass plate. These ghosts are particularly perceptible in the dark, especially in the case of strongly illuminating light sources, such as headlights of oncoming vehicles. These ghosts are very disturbing and present a safety issue.

In general, the composite glass panel may also be used as a head-up display (HUD) to display information. In this case, an image is projected by a projection device onto the composite glass pane in order to display information in the field of view of the viewer. In the field of vehicles, projection devices are arranged, for example, on the dashboard to reflect a projection image in the direction of the observer on the closest glass face of the composite glass pane inclined relative to the observer (see, for example, european patent EP 0420228B 1 or german laid-open patent DE 102012211729 a 1). In this case, a portion of the light again enters the composite glass pane and is reflected, for example, at the inner boundary layer of the outermost glass surface and the intermediate layer with respect to the viewer and then exits the composite glass pane in an offset manner. Here, a similar effect, i.e. a ghost effect, also occurs with respect to the image to be displayed.

A pure classical compensation of the ghost image results in an overcompensation of the ghost image observed in transmission. This may disturb the respective viewer or in the worst case obtain erroneous information. This problem can be solved by arranging the surfaces of the glass sheets no longer parallel but at a fixed angle. This is achieved, for example, by the intermediate layer being wedge-shaped with a continuously linear and/or non-linearly increasing and/or decreasing thickness. In vehicle manufacturing, the thickness is typically varied such that a minimum thickness is provided at the lower end of the composite glass panel towards the engine compartment, while the thickness increases towards the roof.

Composite glass panes of this type with wedge-shaped intermediate layers and the optical laws on which they are based are known per se and are described, for example, in the international patent applications WO 2015/086234 a1 and WO 2015/086233 a1 or in the german published applications DE 19611483 a1 and DE 19535053 a 1.

Instead of arranging a wedge-shaped interlayer between two glass sheets of constant thickness, it is also possible to realize a wedge-shaped composite glass sheet by arranging an interlayer of constant thickness between at least one of the two glass sheets having a wedge-shaped cross section.

EP 3248949 a1 and US 7,122,242B 2 disclose methods for producing float glass sheets having a wedge-shaped cross-section, and composite glass sheets comprising two float glass sheets and an interlayer located therebetween, wherein at least one of the float glass sheets has a wedge-shaped cross-section. US 2017/0305240 a1, EP 3381879 a1, US 2018/0312044 a1 and JP 2017-.

In the case of the float glass process, the glass melt is guided from one side onto a liquid tin bath (float bath). For example, the temperature at the inlet of the tin bath is about 1000 ℃. The lighter glass melt floats on the tin and spreads evenly over the tin surface. At the cooler end of the tin bath, the solidified glass is continuously drawn out in the form of a ribbon and then cooled. After sufficient cooling, glass sheets of the desired size are cut out of the glass ribbon, respectively, from which glass sheets, for example for windshields, can then be cut out.

The equilibrium thickness of the glass is determined by distributing the glass melt over a tin bath. In order to produce float glass with a wedge-shaped cross section, the glass is drawn from a tin bath, for example, by actively driven (top) rollers, whereby an elongation of the glass ribbon is achieved. In this regard, the thickness of the glass can be set by the speed of the rollers, with faster roller speeds being set for making thinner glass and lower roller speeds being set for thicker glass. When, for example, the speed of the rollers is greater in the side regions of the ribbon than in the center of the ribbon, then a ribbon having a plano-convex cross-section can be produced from which the wedge-shaped glass sheets can be cut.

As is known to those skilled in the art, glass produced in the float glass process has a certain unevenness or waviness on its surface as a result of being drawn from a tin bath. Thus, both glass surfaces have elongated projections and recesses arranged in parallel, which extend in the direction of drawing the glass ribbon from the tin bath, respectively. The elongated projections and recesses correspond to peaks and valleys, which are alternately arranged perpendicular to the pull-out direction. These elongated structures of glass are also known to the person skilled in the art under the term "float lines". In the manufacture of flat glass sheets having a wedge-shaped cross-section, the glass sheet is cut with its longer dimension along the direction of withdrawal of the glass ribbon from the tin bath so that the float lines extend parallel to the longer dimension of the glass sheet.

Moreover, thermoplastic interlayers produced by extrusion processes are often characterized by undesirable waviness associated with manufacturing. This is manifested as a thickness variation perpendicular to the extrusion direction (elongated protrusions and recesses).

The superposition of the manufacturing-related waviness of the thermoplastic interlayer and the manufacturing-related waviness of the glass sheets can lead to an adverse impairment of the optical properties of the composite glass in which the thermoplastic interlayer is laminated between the first glass sheet and the second glass sheet. This effect is particularly pronounced when the thermoplastic interlayer is disadvantageously superimposed with the manufacturing-related waviness of the first and second glass sheets. When the head is tilted from side to side or from top to bottom, for example in the case of a windshield of a motor vehicle, objects may be distorted in transmission by the locally changing optical refractive power.

The object of the present invention is to provide a composite glass sheet which is simple to manufacture and has improved optical quality.

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

The composite glass sheet according to the invention comprises at least:

-an outer glass plate;

-an inner glass sheet; and

-a thermoplastic interlayer arranged between the outer glass pane and the inner glass pane.

The outer and inner glass sheets have outer and inner space-side surfaces, respectively, and peripheral side edges extending therebetween. In the present invention, the outside surface refers to that main surface which is provided facing the outside environment in the mounted position. In the present invention, the inner space side surface refers to that major surface which is provided toward the inner space in the mounted position. The inner space-side surface of the outer glass pane and the outer side surface of the inner glass pane are directed towards one another and are joined to one another by means of a thermoplastic interlayer.

The composite glass sheet according to the invention has an upper edge and a lower edge. The upper edge refers to that edge of the composite glass sheet which is provided facing upwards in the mounted position. By lower edge is meant that edge which is provided facing downwards in the mounted position. The glass-plate-side edge is the edge arranged on the side, for example adjoining the a-pillar in the case of a windshield of a motor vehicle. If the composite glass pane is a windshield of a motor vehicle, the upper edge is also commonly referred to as the roof edge and the lower edge is also referred to as the engine edge.

According to the invention, the outer and/or inner glass pane is formed in the form of a flat glass pane produced in a float process and having a wedge-shaped cross section with a thicker first end and a thinner second end, and has, in connection with the production, a plurality of elongate elevations and elongate depressions on the glass pane surface, which elevations and depressions extend in the direction of the first glass pane and are arranged alternately in the direction of the second glass pane perpendicular to the direction of the first glass pane. In this case, the second glass sheet direction extends from the upper edge to the lower edge of the glass sheet.

By providing the outer glass pane and/or the inner glass pane with a wedge-shaped cross section, the composite glass pane according to the invention also has a wedge-shaped cross section.

It should be understood that cross-section refers to a cross-section extending vertically between a lower edge and an upper edge. In the case of the composite glass sheet according to the invention, the thickness increases from the lower edge to the upper edge. Thus, the thicker first end is located at the upper edge of the composite glass sheet and the thinner second end is located at the lower edge of the composite glass sheet. The same applies to the outer glass pane and/or the inner glass pane having a wedge-shaped cross section.

In a preferred embodiment, both the outer and inner glass sheets are flat glass sheets having a wedge-shaped cross-section produced in a float process. In this case, the outer glass plate has a plurality of elongated projections and elongated recesses on the surface of the glass plate, which extend in the first glass plate direction and are alternately arranged in the second glass plate direction perpendicular to the first glass plate direction. The inner glass pane in this case likewise has a plurality of elongated projections and elongated recesses on the glass pane surface, which projections and recesses extend in the direction of the first glass pane and are arranged alternately in the direction of the second glass pane perpendicular to the direction of the first glass pane.

In another embodiment, only the outer glass sheet is a flat glass sheet with a wedge-shaped cross-section produced in a float process, while the inner glass sheet is a flat glass sheet with a substantially constant thickness produced in a float process, for example. In this case, the outer glass plate has a plurality of elongated projections and elongated recesses on the surface of the glass plate, which extend in the first glass plate direction and are alternately arranged in the second glass plate direction perpendicular to the first glass plate direction. The inner glass pane has in this case a plurality of elongated projections and elongated recesses on the glass pane surface, which projections and recesses extend in the fifth glass pane direction and are arranged alternately in a sixth glass pane direction perpendicular to the fifth glass pane direction.

In another embodiment, only the inner glass sheet is a flat glass sheet with a wedge-shaped cross-section produced in a float process, while the outer glass sheet is a flat glass sheet with a substantially constant thickness produced in a float process, for example. In this case, the inner glass sheet has a plurality of elongated projections and elongated recesses on the surface of the glass sheet, which extend in the first glass sheet direction and are alternately arranged in the second glass sheet direction perpendicular to the first glass sheet direction. The outer glass plate has in this case a plurality of elongated projections and elongated recesses on the glass-plate surface, which projections and recesses extend in the fifth glass-plate direction and are arranged alternately in a sixth glass-plate direction perpendicular to the fifth glass-plate direction.

In connection with the manufacture, the elongated protrusions and elongated recesses extend from the upper edge to the lower edge for sheet glass having a substantially constant thickness manufactured in the float process, while the elongated protrusions and elongated recesses extend between the side edges of the glass sheets for sheet glass having a wedge-shaped cross-section manufactured in the float process.

According to the invention, the thermoplastic interlayer arranged between the outer glass pane and the inner glass pane has a substantially constant thickness.

In this application it should be understood that a substantially constant thickness of a layer means that the thickness of the layer is constant across the length and width within normal manufacturing tolerances. This preferably means that the thickness does not vary by more than 5%, preferably by more than 3%.

The thermoplastic intermediate layer has a total thickness of, for example, 0.10 mm to 1.00 mm, and may in particular be 0.38 mm or 0.76 mm or 0.84 mm. However, thermoplastic films, particularly PVB films, are also sold at a thickness of 1.14 mm or 1.52 mm. Thermoplastic films with sound-insulating properties are sold, for example, in thicknesses of 0.50 mm and 0.84 mm.

The thermoplastic intermediate layer of the composite glass pane according to the invention is produced by an extrusion process, wherein the plasticized material in the form of a film is discharged from an extruder device. The thermoplastic intermediate layer therefore has a certain degree of surface waviness or unevenness in connection with manufacture. Thus, the surface of the thermoplastic intermediate layer has a plurality of elongated projections (crests) and elongated recesses (troughs) extending along the third (film) direction and alternately arranged in the fourth (film) direction perpendicular to the third (film) direction. The third direction corresponds to the extrusion direction of the thermoplastic intermediate layer. The elongated protrusions and elongated recesses of the thermoplastic intermediate layer are generally parallel to each other and are arranged in an alternating order with each other.

The elongated projections (peaks) and depressions (valleys) describe in the present invention a surface waviness which is practically undesirable in connection with manufacturing. Typically, the distance between adjacent protrusions or the distance between adjacent recesses is greater than or equal to 50 mm. This is distinguished from the desired surface roughness, which is usually intentionally impressed into the film surface in the form of elongated projections and recesses, which are typically less than 1 mm apart, to facilitate outgassing when laminating the composite glass sheet.

In the composite glass pane according to the invention, the thermoplastic intermediate layer is arranged such that the elongate projections of the thermoplastic intermediate layer are arranged at an angle of 45 ° to 90 ° relative to the elongate projections of the outer glass pane and/or the inner glass pane, wherein the outer glass pane and/or the inner glass pane are formed in the form of a flat glass pane having a wedge-shaped cross section produced in the float process. It should be understood that when describing the magnitude of the angle, it can refer to the angle measured clockwise and counterclockwise, respectively.

As a result of this arrangement of the thermoplastic interlayer, the optical properties of the composite glass pane according to the invention are improved with respect to those of a composite glass pane in which the elongate projections of the thermoplastic interlayer are arranged at an angle of 0 ° with respect to the elongate projections of the outer glass pane and/or of the inner glass pane formed in the form of a flat glass pane having a wedge-shaped cross section produced in the float process.

In the composite glass pane according to the invention, the thermoplastic intermediate layer is arranged such that the elongate projections of the thermoplastic intermediate layer are arranged at an angle of 45 ° to 90 ° relative to the elongate projections of the outer glass pane and/or of the inner glass pane formed in the form of flat glass with a wedge-shaped cross section produced in the float process, which means that, for the case in which the outer glass pane is formed in the form of flat glass with a wedge-shaped cross section produced in the float process and the inner glass pane is formed in the form of flat glass with a substantially constant thickness produced in the float process, the elongate projections of the thermoplastic intermediate layer are arranged at an angle of 45 ° to 90 ° relative to the elongate projections of the outer glass pane. For the case where the inner glass sheet is formed in the form of flat glass having a wedge-shaped cross section produced in a float process and the outer glass sheet is formed in the form of flat glass having a substantially constant thickness produced in a float process, the elongated protrusions of the thermoplastic interlayer are arranged at an angle of 45 ° to 90 ° relative to the elongated protrusions of the inner glass sheet. In the case where the outer glass sheet is formed in the form of a flat glass sheet having a wedge-shaped cross section produced in a float process and the inner glass sheet is also formed in the form of a flat glass sheet having a wedge-shaped cross section produced in a float process, the elongated protrusions of the thermoplastic interlayer are arranged at an angle of 45 ° to 90 ° with respect to the elongated protrusions of the outer glass sheet and at an angle of 45 ° to 90 ° with respect to the elongated protrusions of the inner glass sheet.

In one advantageous embodiment of the invention, the thermoplastic interlayer is arranged such that the elongate projections of the thermoplastic interlayer are arranged at an angle of 60 ° to 90 °, in particular at an angle of 75 ° to 90 °, relative to the elongate projections of the outer glass pane and/or of the inner glass pane, wherein the outer glass pane and/or the inner glass pane are formed in the form of a flat glass pane with a wedge-shaped cross section produced in a float process.

In a particularly preferred embodiment of the invention, the thermoplastic interlayer is arranged in the composite glass pane in such a way that the elongate projections of the thermoplastic interlayer are arranged at an angle of 90 ° relative to the elongate projections of the outer and/or inner glass pane, which are formed in the form of flat glass with a wedge-shaped cross section produced in the float process.

In one embodiment of the composite glass pane according to the invention, the wedge angle of the composite glass pane is preferably from 0.1mrad to 1.0 mrad, particularly preferably from 0.15 mrad to 0.75 mrad, very particularly preferably from 0.3 mrad to 0.7 mrad.

In one embodiment the thermoplastic interlayer comprises, independently of one another, at least polyvinyl butyral (PVB), Ethylene Vinyl Acetate (EVA), Polyurethane (PU) or mixtures or copolymers or derivatives thereof, preferably polyvinyl butyral (PVB), particularly preferably polyvinyl butyral (PVB) and a plasticizer.

The thermoplastic intermediate layer may be formed by a single film or also by more than one film.

The thermoplastic interlayer may be a functional interlayer, in particular an interlayer having sound-insulating properties, an infrared radiation reflecting interlayer, an infrared radiation absorbing interlayer, a UV radiation absorbing interlayer, a dyed interlayer and/or a pigmented interlayer.

In one embodiment, the thermoplastic interlayer is a functional interlayer having sound-deadening properties. Such an acoustic intermediate layer comprises a first layer, a second layer and a third layer arranged therebetween, which has a higher plasticity than the first and second layers, for example due to a higher proportion of plasticizer.

In one embodiment, the thermoplastic interlayer is a functional interlayer having sound-insulating properties, and the thickness of the third layer is 0.10 mm, and the thickness of the first layer and the second layer is 0.20 mm, respectively. In another embodiment, the third layer has a thickness of 0.08 mm to 0.12 mm, and the first and second layers each have a thickness of 0.32 mm to 0.38 mm.

In another embodiment, the thermoplastic interlayer is a functional interlayer having color functionality. This means that the thermoplastic intermediate layer is dyed or pigmented. In the case of a composite glass pane provided as a windshield, the dyeing or tinting is formed such that the composite glass pane has a light transmission of more than 70% in the spectral range from 380 nm to 780 nm. In the case of a composite glass panel provided as a roof glass panel or a rear glass panel, dyeing or coloring may also be formed into a darker color, and thus the composite glass panel has a light transmittance of 70% or less in the spectral range of 380 nm to 780 nm. It should be understood that in embodiments of the windshield, the transmission outside the field of view, particularly in the region adjacent the roof edge, may also be below 70%.

In another embodiment, the thermoplastic interlayer is a functional interlayer having solar function, in particular infrared radiation absorbing properties, such as a PVB film comprising Indium Tin Oxide (ITO) particles therein.

In one embodiment, the thermoplastic intermediate layer is formed as an infrared radiation reflecting element, for example as an infrared radiation reflecting double layer comprising a first layer and a carrier film with an infrared radiation reflecting coating disposed thereon, or as an infrared radiation reflecting triple layer comprising a first layer, a second layer and a carrier film with an infrared radiation reflecting coating disposed therebetween.

The thermoplastic interlayer may also be a functional interlayer in which two or more functional properties are combined, such as sound insulation with a color function and/or a daylight function.

The composite glass pane according to the invention may comprise additional further interlayers, in particular functional interlayers. They are arranged between the outer glass pane and the thermoplastic interlayer or between the inner glass pane and the thermoplastic interlayer. If the composite glass pane according to the invention has two or more additional intermediate plies, it is also possible to arrange at least one of the additional intermediate plies between the outer glass pane and the thermoplastic intermediate ply and at least one of the additional intermediate plies between the inner glass pane and the thermoplastic intermediate ply.

The additional intermediate layer can be, in particular, an infrared radiation reflecting element, an ultraviolet radiation absorbing layer, a pigmented or dyed layer, a barrier layer or a combination of these. In the case where there are a plurality of additional intermediate layers, these intermediate layers may also have different functions.

As mentioned above, according to the invention, the outer glass sheet and/or the inner glass sheet is float glass having a wedge-shaped cross-section, which is manufactured in a float glass process. For example, it may be quartz glass, borosilicate glass, aluminosilicate glass or preferably soda-lime glass.

If only the outer glass sheet is float glass with a wedge-shaped cross section, which is produced in a float glass process, the inner glass sheet has a substantially constant thickness and can be made of soda-lime glass as is common for window glass in a float glass process. However, the inner glass plate can also in this case be made of other types of glass, for example quartz glass, borosilicate glass or aluminosilicate glass. Alternatively, the inner glass pane can also be produced in this case not in the float glass process but from a rigid transparent plastic (for example polycarbonate or polymethyl methacrylate).

If only the inner glass sheet is float glass with a wedge-shaped cross section, which is produced in a float glass process, the outer glass sheet has a substantially constant thickness and can be made of soda-lime glass as is common for window glass in a float glass process. However, the outer glass plate can also in this case be made of other types of glass, for example quartz glass, borosilicate glass or aluminosilicate glass. Alternatively, the outer glass plate can also be produced in this case not in the float glass process but from a rigid transparent plastic (for example polycarbonate or polymethyl methacrylate).

The outer glass pane and/or the inner glass pane may have an anti-reflection coating, an anti-adhesion coating, an anti-scratch coating, a photocatalytic coating, an electrically heatable coating, a sun protection coating and/or a low-emissivity coating.

The thickness of the outer and inner glass sheets can vary widely and can therefore be matched to the requirements of the particular case. The thickness of the outer and inner glass panes is preferably 1 mm to 5 mm, particularly preferably 1 mm to 3 mm, wherein thickness in the case of wedge-shaped glass panes means the maximum thickness, i.e. in the case of wedge-shaped glass panes the thickness at the thicker first end. For example, the outer glass plate has a thickness of 2.1 mm and the inner glass plate has a thickness of 1.6 mm. However, the outer glass plate or especially the inner glass plate can also be a thin glass, the thickness of which is for example 0.55 mm.

The height of the outer and inner glass panes, i.e. the distance between the roof edge of the composite glass pane and the engine edge of the composite glass pane in the case of windshields, is preferably from 0.8 m to 1.40 m, particularly preferably from 0.9 m to 1.25 m. It is to be understood that the height of the thermoplastic intermediate layer and the optional additional intermediate layer is thus also preferably from 0.8 m to 1.40 m, particularly preferably from 0.9 m to 1.25 m.

The composite glass sheet according to the invention may be a vehicle glass. The vehicle glazing is provided for separating the vehicle interior space from the external environment. Thus, the vehicle glazing is also a glazing for or provided in a window opening of a vehicle body. The composite glass pane according to the invention is in particular a windshield for a motor vehicle.

In the case of a vehicle glazing, the inner glazing panel is that glazing panel which is provided facing the interior space of the vehicle in the installed position. By outer glass pane is meant that glass pane which is provided in the mounted position towards the environment outside the vehicle.

The outer and inner glass panes may be transparent and colorless independently of one another, but may also be colored, clouded or dyed. In a preferred embodiment the total transmission through the composite glass sheet is greater than 70%, especially when the composite glass sheet is a windshield. The term "total transmission" relates to the method for testing the light transmission of motor vehicle glass as determined by ECE-R43, accessory 3, section 9.1. The outer and inner glass sheets may be composed of non-prestressed, partially prestressed or prestressed glass.

The composite glass pane according to the invention may additionally comprise a screen print, in particular a screen print consisting of a dark, preferably black enamel. The screen print is in particular a peripheral, i.e. frame-like screen print. The surrounding screen print is primarily used as UV protection for the mounting adhesive of the composite glass pane. The mask print may be opaque and formed over the entire surface. The screen print can also be formed at least partially translucent, for example as a dot grid, a stripe grid or a grid. Alternatively, the mask print may also have a gradient, for example from an opaque overlay to a translucent overlay. The screen print is usually applied to the inner space side surface of the outer glass pane or to the inner space side surface of the inner glass pane.

The composite glass sheet according to the present invention is preferably curved in one or more directions in space, as is common for automotive vehicle glass, with a typical radius of curvature of about 10 cm to about 40 m. However, if the composite glass is used as a glass sheet for a bus, train or tractor, it may also be planar.

The composite glass pane according to the invention can be used as a head-up display (HUD) for displaying information, i.e. the composite glass pane according to the invention is in particular a composite glass pane for a head-up display.

The invention also relates to a projection device for a head-up display (HUD), comprising at least a composite glass pane according to the invention and a projector. As is common in the case of HUDs, the projector illuminates the region of the windscreen, in which the illumination is reflected in the direction of the viewer (driver), thereby producing a virtual image which the viewer perceives from his point of view as being behind the windscreen. The area of the windshield that the projector can illuminate is called the HUD area. The irradiation direction of the projector can usually be varied by means of mirrors, in particular vertically, so that the projection matches the body size of the viewer. The area in which the eyes of the viewer must be located given the position of the mirror is called the eyebox window (eyebox). The view box window can be moved vertically by adjusting the mirror, wherein the entire region accessible thereby (i.e. the superposition of all possible view box windows) is referred to as the view box. A viewer located within the view box may perceive the virtual image. Of course, this therefore means that the eyes of the viewer, rather than for example the entire body, must be located within the viewing box.

For a detailed description, please refer to the doctor paper of Alexander Neumann of Institut f ü r Informatik der Technischen university ä t M ü nchen, "simulationbaisie Messtechnik zur Pr ü fung von Head-Up display" (Munich: Munich Industrial university library, 2012), in particular Chapter 2 "Das Head-Up display".

The above-described preferred embodiments of the composite glass sheet according to the invention are also correspondingly applicable to a projection device comprising a composite glass sheet according to the invention and a projector.

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

(a) providing an outer glass sheet and an inner glass sheet, wherein the outer glass sheet and/or the inner glass sheet are formed in the form of flat glass having a wedge-shaped cross section manufactured in a float process, and have a plurality of elongated protrusions and elongated recesses on a surface of the glass sheet, the protrusions and recesses extending in a first glass sheet direction and being alternately arranged in a second glass sheet direction perpendicular to the first glass sheet direction;

(b) providing a thermoplastic interlayer manufactured in an extrusion process, which has a substantially constant thickness across a length and a width, and whose surface has a plurality of elongated protrusions and elongated recesses extending along a third direction and alternately arranged in a fourth direction perpendicular to the third direction;

(c) arranging the thermoplastic interlayer in such a plane between the outer glass pane and the inner glass pane that the elongate projections of the thermoplastic interlayer are arranged at an angle of 45 ° to 90 ° relative to the elongate projections of the outer glass pane and/or the inner glass pane, wherein the outer glass pane and/or the inner glass pane are formed in the form of a flat glass pane with a wedge-shaped cross section produced in a float process;

(d) the outer glass sheet, the thermoplastic interlayer and the inner glass sheet are joined by lamination.

In an advantageous embodiment of the method, in step (c), the thermoplastic interlayer is arranged flat between the outer glass pane and the inner glass pane in such a way that the elongate projection of the thermoplastic interlayer is arranged at an angle of 60 ° to 90 °, preferably 75 ° to 90 °, very particularly preferably 90 °, relative to the elongate projection of the outer glass pane and/or of the inner glass pane, wherein the outer glass pane and/or the inner glass pane is formed in the form of a flat glass pane having a wedge-shaped cross section produced in a float process.

The method according to the invention may additionally comprise the following steps: at least one additional intermediate layer is provided and arranged between the first thermoplastic layer and the second thermoplastic layer. The at least one additional intermediate layer may in particular be an IR-reflecting layer, a UV radiation-absorbing layer, a pigmented or dyed layer, a barrier layer or a combination of these. In case a plurality of additional intermediate layers are present, these may also have different functions.

If the composite glass sheet is bent, it is preferred that the outer glass sheet and the inner glass sheet undergo a bending process prior to lamination. Preferably, the outer glass pane and the inner glass pane are bent congruent together (i.e. simultaneously and by the same tool), since the shapes of the glass panes for the subsequent lamination are thereby optimally matched to one another. Typical temperatures for the glass bending process are, for example, 500 ℃ to 700 ℃.

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

The composite glass pane according to the invention can be used, for example, as a head-up display (HUD) for displaying information.

The invention also relates to the use of the composite glass pane according to the invention as a vehicle glass in a land, air or water vehicle, in particular in a motor vehicle, and in particular as a windscreen acting as a projection surface for a projection device of a head-up display.

The invention will be explained in more detail below with reference to the figures and exemplary embodiments. The figures are diagrammatic representations, not drawn to scale. The drawings are not intended to limit the invention in any way.

FIG. 1 shows a schematic view of the arrangement of a single glass sheet having a wedge-shaped cross-section when cut from flat glass manufactured in a float process;

FIG. 2 shows a cross-sectional view of a single glass sheet having a wedge-shaped cross-section made in a float process along section line X-X' shown in FIG. 1;

FIG. 3 shows a schematic view of a thermoplastic interlayer partially unrolled from a roll;

FIG. 4 shows a portion of a cross-sectional view of one embodiment of a thermoplastic interlayer along section line A-A' shown in FIG. 3;

FIG. 5 shows a portion of a cross-sectional view of another embodiment of a thermoplastic interlayer;

FIG. 6 shows a schematic view of one arrangement for cutting the thermoplastic interlayer of FIG. 4 from a single glass sheet having a wedge-shaped cross-section, comprised of flat glass made in a float process;

FIG. 7 shows a schematic view of another arrangement for cutting the thermoplastic interlayer of FIG. 4 from a single glass sheet having a wedge-shaped cross-section, comprised of flat glass made in a float process;

FIG. 8 shows an exploded view of one embodiment of a composite glass sheet according to the present invention;

FIG. 9 shows an exploded view of another embodiment of a composite glass sheet in accordance with the present invention;

FIG. 10 shows an exploded view of another embodiment of a composite glass sheet in accordance with the present invention;

FIG. 11 shows an exploded view of another embodiment of a composite glass sheet in accordance with the present invention;

FIG. 12 illustrates a composite glass sheet, particularly a windshield of a motor vehicle, according to one embodiment of the present invention;

FIG. 13 shows a cross-section of an embodiment of a projection device according to the invention; and

figure 14 shows a flow chart of one embodiment of a method according to the present invention.

Fig. 1 shows a schematic view of the arrangement of a single glass sheet 5 when cutting it out of a flat glass sheet with a wedge-shaped cross section 5 produced in a float process from a glass ribbon 21 produced in a float process and having a plano-convex cross section. The first direction R1 corresponds to the pull direction of the glass ribbon 21 in the float process. The second direction R2 is perpendicular to the first direction R1.

Figure 2 shows a cross-sectional view of a single glass sheet having a wedge-shaped cross-section 5 made in a float process along section line X-X' shown in figure 1. The single glass pane 5 shown in fig. 2 may be, for example, the outer glass pane 2 of the composite glass 1 according to the invention. However, the single glass pane 5 shown in fig. 2 can also be the inner glass pane 3 of the composite glass 1 according to the invention. In the case of the composite glass 1 according to the invention, it is also possible to form the outer glass pane 2 as well as the inner glass pane 3 as shown in fig. 2.

The individual glass plate 5 shown in fig. 2 has on the surfaces 12, 12' elevations 8 and depressions 9 which extend perpendicularly to the shortest connecting line between the upper side O and the lower side U. The single glass sheet shown in fig. 2 has a thickness of, for example, 2.1 mm and a wedge angle of 0.7 mrad.

Fig. 3 shows a schematic view of the thermoplastic intermediate layer 4 partially unwound from the roll 15. The thermoplastic interlayer 4 is preferably composed of PVB. Alternatively, the thermoplastic intermediate layer 4 may be composed of another suitable material, such as polyamide or polyethylene. The thermoplastic intermediate layer 4 is produced by extrusion, wherein the extrusion direction of the thermoplastic intermediate layer 4 corresponds to the roll-up or roll-off direction of the roll 15. In fig. 3, the extrusion-or deployment direction is indicated by arrow R3.

Fig. 4 shows a detail of a cross-sectional view of the thermoplastic intermediate layer 4 according to the section line a-a' shown in fig. 3. It can be seen that the thickness of the thermoplastic intermediate layer 4 is substantially constant across the length and width. The thickness of the thermoplastic intermediate layer 4 is, for example, 0.76 mm. The surfaces 13, 13' of the thermoplastic intermediate layer 4 have a plurality of elongated protrusions 10 protruding from the surface and elongated recesses 11 recessed from the surface, which are arranged in parallel. The projections 10 and the recesses 11 each extend in the extrusion direction R3 (not shown in fig. 4). Transversely to the extrusion direction, i.e. in the direction R4, the protrusions 10 and the recesses 11 are arranged alternately. The protrusions 10 and the recesses 11 are formed corrugated such that the surfaces 13, 13' of the thermoplastic intermediate layer 4 have a corrugation. In fig. 4, the upper side O and the lower side U of the thermoplastic intermediate layer 4 are also indicated.

Fig. 5 shows a detail of a cross-sectional view of an embodiment of the thermoplastic intermediate layer 4. It can be seen that the thermoplastic intermediate layer 4 comprises a first layer 6a, a second layer 6b and a third layer 6c arranged between the first layer 6a and the second layer 6b, wherein the third layer 6c has sound-insulating properties. The thickness of the first layer 6a, the second layer 6b, the third layer 6c and the total thickness of the thermoplastic intermediate layer 4 are substantially constant across the length and width, respectively. The total thickness of the thermoplastic intermediate layer 4 is, for example, 0.84 mm. The surfaces 13, 13' of the thermoplastic intermediate layer 4 have a plurality of elongated protrusions 10 protruding from the surface and elongated recesses 11 recessed from the surface, which are arranged in parallel. The protrusions 10 and the recesses 11 each extend in the extrusion direction R3 (not shown in fig. 5). Transversely to the extrusion direction, i.e. in the direction R4, the protrusions 10 and the recesses 11 are arranged alternately. The protrusions 10 and the recesses 11 are formed corrugated such that the surfaces 13, 13' of the thermoplastic intermediate layer 4 have a corrugation.

Fig. 6 shows a schematic view of one arrangement of a single glass sheet with a wedge-shaped cross-section 5, consisting of flat glass produced in a float process, for cutting the thermoplastic interlayer 4 of fig. 4 for producing a composite glass sheet 1 according to the invention. Accordingly, the thermoplastic film 4 is cut from the roll 15 such that the glass pane edges extending in the transverse direction of the transport means in the mounted state are arranged perpendicular to the extrusion direction R3. When the individual glass pane 5 is arranged on the spread-out thermoplastic interlayer 4 as shown in fig. 6, the elevations 10 and depressions 11 of the thermoplastic interlayer 4 are arranged offset by 90 ° with respect to the direction R1 and thus offset by 90 ° with respect to the elevations 8 and depressions 9 of the individual glass pane 5.

Fig. 7 shows a schematic view of another arrangement of a single glass sheet with a wedge-shaped cross section 5, consisting of flat glass produced in a float process, for cutting the thermoplastic interlayer 4 of fig. 4 for producing a composite glass sheet 1 according to the invention. Accordingly, the thermoplastic film 4 is cut from the roll 15 such that the glass-sheet edges extending in the transverse direction of the transport means in the mounted state are arranged at an angle of 45 ° with respect to the extrusion direction R3. When a single glass pane 5 is arranged on the spread-out thermoplastic interlayer 4 as shown in fig. 7, the elevations 10 and depressions 11 of the thermoplastic interlayer 4 are arranged offset by 45 ° with respect to the direction R1 and thus offset by 45 ° with respect to the elevations 8 and depressions 9 of the single glass pane 5.

Figure 8 shows an exploded view of one embodiment of a composite glass sheet 1 according to the present invention. The composite glass pane 1 comprises an outer glass pane 2 and an inner glass pane 3 and a thermoplastic interlayer 4 arranged therebetween. The thermoplastic intermediate layer 4 has, in connection with the production, a plurality of elongated protrusions 10 protruding from the surface 13, 13' and elongated recesses 11 recessed from the surface, arranged in parallel. The convex portion 10 and the concave portion 11 extend in the direction indicated by the arrow R3 in fig. 8, respectively. Transversely to the direction R3, the projections 10 and the recesses 11 are arranged alternately. The convex portions 10 and the concave portions 11 are formed in a corrugated shape.

The outer glass pane 2 and the inner glass pane 3 are formed as a wedge-shaped flat glass 5 produced in the float process and have, in connection with the production, a plurality of elongate projections 8 projecting from the surface and elongate recesses 9 recessed from the surface, which are arranged in parallel. The convex portion 8 and the concave portion 9 extend in the direction indicated by the arrow R1 in fig. 8, respectively. Transversely to the direction R1, the projections 8 and the recesses 9 are arranged alternately. The convex portions 8 and the concave portions 9 are formed in a corrugated shape.

As is shown in fig. 8, in the embodiment of the composite glass pane 1 according to the invention shown in fig. 8, the thermoplastic interlayer 4 and the outer glass pane 2 and the inner glass pane 3 are arranged such that the elevations 10 and depressions 11 of the thermoplastic interlayer 4 are arranged offset by 90 ° with respect to the direction R1 and thus offset by 90 ° with respect to the elevations 8 and depressions 9 of the outer glass pane 2 and the inner glass pane 3.

Figure 9 shows an exploded view of another embodiment of a composite glass sheet 1 according to the present invention. The embodiment shown in fig. 9 differs from the embodiment shown in fig. 8 only in that the thermoplastic intermediate layer 4 and the outer and

inner glass panes

2, 3 are arranged such that the elevations 10 and depressions 11 of the thermoplastic intermediate layer 4 are arranged offset by 45 ° with respect to the direction R1 and thus offset by 45 ° with respect to the elevations 8 and depressions 9 of the outer and

inner glass panes

2, 3.

Figure 10 shows an exploded view of another embodiment of a composite glass sheet 1 according to the present invention. The composite glass pane 1 comprises an outer glass pane 2 and an inner glass pane 3 and a thermoplastic interlayer 4 arranged therebetween. The thermoplastic intermediate layer 4 has, in connection with the production, a plurality of elongated protrusions 10 protruding from the surface 13, 13' and elongated recesses 11 recessed from the surface, arranged in parallel. The convex portion 10 and the concave portion 11 extend in the direction indicated by the arrow R3 in fig. 10, respectively. Transversely to the direction R3, the projections 10 and the recesses 11 are arranged alternately. The convex portions 10 and the concave portions 11 are formed in a corrugated shape.

The outer glass pane 2 is formed as a wedge-shaped flat glass 5 produced in the float process and has, in connection with the production, a plurality of elongate elevations 8 projecting from the surface 12, 12' and elongate depressions 9 recessed from the surface, which are arranged in parallel. The convex portion 8 and the concave portion 9 extend in the direction indicated by the arrow R1 in fig. 10, respectively. Transversely to the direction R1, the projections 8 and the recesses 9 are arranged alternately. The convex portions 8 and the concave portions 9 are formed in a corrugated shape.

As shown in fig. 10, in the embodiment of the composite glass pane 1 according to the invention shown in fig. 10, the thermoplastic intermediate layer 4 and the outer glass pane 2 are arranged such that the elevations 10 and depressions 11 of the thermoplastic intermediate layer 4 are arranged offset by 90 ° with respect to the direction R1 and thus offset by 90 ° with respect to the elevations 8 and depressions 9 of the outer glass pane 2.

In the embodiment shown in figure 10, the inner glass sheet 3 is formed as flat glass with a constant thickness 7 produced in a float process. It has floats, i.e. protrusions 19 and recesses 20, which extend along the fifth direction R5 and are arranged alternately transversely to the fifth direction R5, i.e. in the sixth direction R6. The convex portions 19 and the concave portions 20 are formed in a corrugated shape.

Figure 11 shows an exploded view of another embodiment of a composite glass sheet 1 according to the present invention. The embodiment shown in fig. 11 differs from the embodiment shown in fig. 10 only in that the thermoplastic intermediate layer 4 and the outer glass pane 2 are arranged such that the elevations 10 and depressions 11 of the thermoplastic intermediate layer 4 are arranged offset by 45 ° with respect to the direction R1 and thus offset by 45 ° with respect to the elevations 8 and depressions 9 of the outer glass pane 2.

Fig. 12 shows an embodiment of a composite glass pane 1 according to the invention, in particular for use as a windshield for a motor vehicle. The embodiment shown in fig. 12 corresponds to the embodiment shown in fig. 8. The outer glass pane 2 and the inner glass pane 3 are formed as shown in figure 2 and the thermoplastic interlayer 4 is formed as shown in figure 4. As shown in fig. 12, a composite glass sheet 1 includes an outer glass sheet 2, an inner glass sheet 3, and a thermoplastic interlayer 4. The composite glass pane 1 has four pane edges, namely a pane upper edge O and a pane lower edge U, which in the mounted state extend in the (transport) transverse direction, and two pane side edges S, which in the mounted state extend in the (transport) vertical direction.

The projections 8 and recesses 9 of the outer glass pane 2 and the projections 8 and recesses 9 of the inner glass pane 3 extend in the embodiment shown in fig. 12 along the shortest connecting line between the side edges S of the glass panes, denoted by R1, wherein the outer glass pane 2 is formed in the form of a flat glass sheet with a wedge-shaped cross section 5 produced in the float process and the outer glass pane 3 is formed in the form of a flat glass sheet with a wedge-shaped cross section 5 produced in the float process. The protrusions 10 and recesses 11 of the thermoplastic intermediate layer 4 extend in the embodiment shown in fig. 12 along the shortest connecting line between the lower edge U of the glass pane and the upper edge O of the glass pane (i.e. the extrusion direction of the thermoplastic intermediate layer 4; indicated with R3).

Fig. 13 shows a cross-section of an embodiment of a projection device 16 according to the invention. The projection device 16 comprises a composite glass pane 1 according to the invention, in particular a windscreen of a passenger car. In the embodiment shown in fig. 13, the outer glass pane 2 and the inner glass pane 3 are formed, for example, as shown in fig. 2, and the thermoplastic interlayer 4 is formed as in fig. 4. The projection device 16 further comprises a projector 17, which is directed at the area B of the composite glass sheet 1. In the region B, which is often referred to as the HUD region, an image can be generated by the projector 17, which image is perceived by the viewer 18 (vehicle driver) as a virtual image on the side of the composite pane 1 facing away from him, when the eyes of the viewer 18 (vehicle driver) are located within the so-called viewing box E.

Fig. 14 shows a flow diagram of an embodiment of a method according to the invention for producing a composite glass pane 1 according to the invention.

The method comprises in a first step I providing an outer glass pane 2 and an inner glass pane 3, wherein the outer glass pane 2 and/or the inner glass pane 3 are formed in the form of flat glass produced in a float process with a wedge-shaped cross section 5 and have a plurality of elongated protrusions 8 and elongated recesses 9 on the glass pane surfaces 12, 12', the protrusions 8 and recesses 9 extending in a first glass pane direction R1 and being arranged alternately in a second glass pane direction R2 perpendicular to the first glass pane direction R1.

In a second step II, the method comprises providing a thermoplastic intermediate layer 4 manufactured in an extrusion method, which has a substantially constant thickness across the length and width and whose surface 13, 13' has a plurality of elongated protrusions 10 and elongated recesses 11, the protrusions 10 and recesses 11 extending along a third direction R3 and being alternately arranged in a fourth direction R4 perpendicular to the third direction R3.

In a third step III, the method comprises the planar arrangement of the thermoplastic interlayer 4 between the outer glass pane 2 and the inner glass pane 3 in such a way that the elongate projections 10 of the thermoplastic interlayer 4 are arranged at an angle of 45 ° to 90 °, preferably 60 ° to 90 °, particularly preferably 75 ° to 90 °, relative to the elongate projections 8 of the outer glass pane 2 and/or of the inner glass pane 3, wherein the outer glass pane 2 and/or the inner glass pane 3 are formed in the form of flat glass produced in a float process with a wedge-shaped cross section 5.

In a fourth step IV, the method comprises joining the outer glass sheet 2, the thermoplastic interlayer 4 and the inner glass sheet 3 by lamination.

In the drawings, the outer glass pane 2, the inner glass pane 3 and the composite glass pane 1 are shown as being planar for the sake of simplicity. If the composite glass sheet 1 is a windshield, it and its outer 2 and inner 3 glass sheets are preferably curved in one or more directions in space, as is common for automotive vehicle glass, with a typical radius of curvature of about 10 cm to about 40 m.

List of reference numerals

1 composite glass plate

2 outer glass plate

3 inner glass plate

4 thermoplastic interlayer

5 a single glass sheet consisting of flat glass with a wedge-shaped cross-section, manufactured in the float process; in that

Flat glass having a wedge-shaped cross section manufactured in a float process;

6a first layer

6b second layer

6c third layer

7 individual glass consisting of flat glass with a substantially constant thickness, produced in the float process

A plate; flat glass with substantially constant thickness produced in a float process

8 convex part

9 concave part

10 convex part

11 recess

12. 12' glass plate surface

13. 13' surface of thermoplastic interlayer

14 additional intermediate layer

15 volume of paper

16 projection device

17 projector

18 viewer

19 convex part

20 recess

21 glass ribbon

R1 first direction

R2 second direction

R3 third Direction

R4 fourth direction

R5 fifth direction

Sixth direction of R6

B HUD region

E view box, view box window

Glazing Panel Upper edge/roof edge of O-composite glazing Panel

Glass sheet lower edge/engine edge of U-composite glass sheet

The side edge of the S-glass sheet.

Claims

1. Composite glass panel (1) comprising at least:

-an outer glass plate (2);

-an inner glass plate (3); and

-a thermoplastic interlayer (4) arranged between the outer glass pane (2) and the inner glass pane (3);

wherein

-the outer glass pane (2) and/or the inner glass pane (3) are formed in the form of flat glass produced in a float process with a wedge-shaped cross section (5) and have a plurality of elongated protrusions (8) and elongated recesses (9) on the glass pane surface (12, 12'), the protrusions (8) and recesses (9) extending along a first glass pane direction (R1) and being alternately arranged in a second glass pane direction (R2) perpendicular to the first glass pane direction (R1);

-the thermoplastic intermediate layer (4) is manufactured in an extrusion process, having a substantially constant thickness across the length and width, and having on a surface (13, 13') a plurality of elongated protrusions (10) and elongated recesses (11), the protrusions (10) and recesses (11) extending along a third direction (R3) and being alternately aligned in a fourth direction (R4) perpendicular to the third direction (R3); and

-arranging the thermoplastic interlayer (4) such that the elongated protrusions (10) of the thermoplastic interlayer (4) are arranged at an angle of 45 ° to 90 ° with respect to the elongated protrusions (8) of the outer glass sheet (2) and/or the inner glass sheet (3), wherein the outer glass sheet (2) and/or the inner glass sheet (3) are formed in the form of flat glass having a wedge-shaped cross-section (5) manufactured in a float process.

2. A composite glass pane (1) according to claim 1, wherein the outer glass pane (2) and the inner glass pane (3) are formed in the form of flat glass produced in a float process with a wedge-shaped cross section (5) and have a plurality of elongate projections (8) and elongate recesses (9) on the glass pane surfaces (12, 12'), the projections (8) and recesses (9) extending in a first glass pane direction (R1) and being arranged alternately in a second glass pane direction (R2) perpendicular to the first glass pane direction (R1), and the thermoplastic interlayer (4) is arranged such that the elongate projections (11) of the thermoplastic interlayer (4) are arranged at an angle of 45 ° to 90 ° relative to the elongate projections (8) of the outer glass pane (2) and the elongate projections (8) of the inner glass pane (3).

3. Composite glass pane (1) according to claim 1 or 2, wherein the thermoplastic interlayer (4) is arranged such that the elongate projections (10) of the thermoplastic interlayer (4) are arranged at an angle of 60 ° to 90 °, preferably 75 ° to 90 °, very particularly preferably 90 °, relative to the elongate projections (8) of the outer glass pane (2) and/or the inner glass pane (3), wherein the outer glass pane (2) and/or the inner glass pane (3) are formed in the form of flat glass having a wedge-shaped cross section (5) produced in a float process.

4. A composite glass pane (1) according to one of claims 1 to 3, wherein the wedge angle of the composite glass pane (1) is between 0.1 and 1.0 mrad, preferably between 0.3 and 0.7 mrad.

5. Composite glass pane (1) according to one of claims 1 to 4, wherein the thermoplastic interlayer (4) comprises at least polyvinyl butyral (PVB), Ethylene Vinyl Acetate (EVA), Polyurethane (PU) or mixtures or copolymers or derivatives thereof, preferably polyvinyl butyral (PVB), particularly preferably polyvinyl butyral (PVB) and a plasticizer.

6. Composite glass pane (1) according to one of claims 1 to 5, wherein the thermoplastic interlayer (4) is a functional interlayer, in particular an interlayer with sound-insulating properties, an infrared radiation absorbing interlayer, an infrared radiation reflecting interlayer, a UV radiation absorbing interlayer, a tinted interlayer and/or a dyed interlayer.

7. A composite glass pane (1) according to claim 6, wherein the thermoplastic interlayer (4) is an interlayer with sound-insulating properties comprising a first layer (6 a), a second layer (6 b) and a third layer (6 c) arranged therebetween, which third layer (6 c) has a higher plasticity or elasticity than the first layer (6 a) and the second layer (6 b).

8. Composite glass pane (1) according to one of claims 1 to 7, further comprising at least one additional intermediate layer (14), in particular an IR reflecting layer, a UV radiation absorbing layer, a tinted or dyed layer, a barrier layer or a combination of these.

9. Composite glass pane (1) according to one of claims 1 to 8, wherein the outer glass pane (2) and/or the inner glass pane (3) have an anti-reflection coating, an anti-adhesion coating, an anti-scratch coating, a photocatalytic coating, an electrically heatable coating, a sun protection coating and/or a low-emissivity coating.

10. Composite glass pane (1) according to one of claims 1 to 9, wherein the composite glass pane (1) is a vehicle glass, in particular a windscreen of a motor vehicle.

11. Projection device (16) for a head-up display (HUD) for displaying information for a viewer (18) in a HUD region (B), the projection device (16) comprising at least:

-a composite glass pane (1) according to one of claims 1 to 10, and

-a projector (17) aimed at the HUD region (B).

12. Method for manufacturing a composite glass sheet (1) according to one of claims 1 to 10, comprising at least the following steps:

(a) providing an outer glass pane (2) and an inner glass pane (3), wherein the outer glass pane (2) and/or the inner glass pane (3) are formed in the form of a flat glass pane with a wedge-shaped cross section (5) produced in a float process and have a plurality of elongate elevations (8) and elongate depressions (9) on the glass pane surfaces (12, 12'), the elevations (8) and depressions (9) extending in a first glass pane direction (R1) and being arranged alternately in a second glass pane direction (R2) perpendicular to the first glass pane direction (R1);

(b) providing a thermoplastic intermediate layer (4) manufactured in an extrusion method, which has a substantially constant thickness across the length and width, and whose surface (13, 13') has a plurality of elongated protrusions (10) and elongated recesses (11), the protrusions (10) and recesses (11) extending along a third direction (R3) and being alternately arranged in a fourth direction (R4) perpendicular to the third direction (R3);

(c) arranging the thermoplastic interlayer (4) between the outer glass pane (2) and the inner glass pane (3) in such a plane that the elongate projections (10) of the thermoplastic interlayer (4) are arranged at an angle of 45 ° to 90 ° relative to the elongate projections (8) of the outer glass pane (2) and/or of the inner glass pane (3), wherein the outer glass pane (2) and/or the inner glass pane (3) are formed in the form of flat glass having a wedge-shaped cross section (5) produced in a float process;

(d) the outer glass plate (2), the thermoplastic interlayer (4) and the inner glass plate (3) are joined by lamination.

13. Method according to claim 12, wherein in step (c) the thermoplastic interlayer (4) is arranged in plane between the outer glass pane (2) and the inner glass pane (3) such that the elongate projections (10) of the thermoplastic interlayer (4) are arranged at an angle of 60 ° to 90 °, preferably 75 ° to 90 °, very particularly preferably 90 °, relative to the elongate projections (8) of the outer glass pane (2) and/or of the inner glass pane (3), wherein the outer glass pane (2) and/or the inner glass pane (3) are formed in the form of flat glass with a wedge-shaped cross section (5) produced in a float process.

14. The method according to claim 12 or 13, further comprising the step of: at least one additional intermediate layer (6), in particular an IR-reflecting layer, a UV-radiation-absorbing layer, a coloured or dyed layer, a barrier layer or a combination of these, is provided and arranged, independently of one another, between the outer glass pane (2) and the thermoplastic intermediate layer (4) or between the inner glass pane (3) and the thermoplastic intermediate layer (4).

15. Use of a composite glass pane (1) according to one of claims 1 to 10 as a vehicle glass in a land, air or water vehicle, in particular in a motor vehicle, and in particular as a windscreen acting as a projection surface for a projection device of a head-up display.