DE202022002840U1 - Composite pane with functional film and camera window - Google Patents

Abstract

Composite pane (1) with an upper pane edge (O), a lower pane edge (U) and two side pane edges (S) at least comprising
- an outer pane (2) with an upper edge (O2), a lower edge (U2) and two side edges (S2),
- a first thermoplastic intermediate layer (3) with an upper edge (O3), a lower edge (U3) and two side edges (S3),
- a functional film (4) with a top edge (O4), a bottom edge (U4) and two side edges (S4),
- a second thermoplastic intermediate layer (5) with an upper edge (O5), a lower edge (U5) and two side edges (S5), and
- an inner pane (6) with an upper edge (O6), a lower edge (U6) and two side edges (S6), the functional film (4) having a rectangular cross section and being arranged between the outer pane (2) and the inner pane (6). ,
the first thermoplastic intermediate layer (3) has a rectangular cross section and is arranged between the outer pane (2) and the functional film (4),
the second thermoplastic intermediate layer (5) has a rectangular cross section and is arranged between the functional film (4) and the inner pane (6), the composite pane (1) has a camera window (7),
and wherein the functional film (4) has a recess (8) with radii greater than or equal to 40 mm and the camera window (7) is arranged completely within the recess (8) when viewed vertically through the composite pane (1).

Description

The invention relates to a composite pane with a functional film and a camera window, as well as an arrangement comprising a composite pane according to the invention and a camera.

Composite windows are now used in many places, especially in vehicle construction. The term vehicle includes, among other things, road vehicles, aircraft, ships, agricultural machinery and work equipment.

Composite panes are also used in other areas. These include, for example, building glazing or information displays, e.g. in museums or as advertising displays.

A composite pane generally has two panes that are laminated to an intermediate layer. The disks themselves can have a curvature and are usually of constant thickness. The intermediate layer generally has a thermoplastic material, preferably polyvinyl butyral (PVB), with a predetermined thickness, for example 0.76 mm.

In order to provide the composite pane with functional properties, a functional film can be laminated into the composite pane.

JP 2015 024 929 A discloses a composite pane with a laminated infrared radiation reflecting/absorbing film, the film having an opening for the transmission of infrared radiation.

Windshields in particular are often equipped with so-called head-up displays (HUDs). Using a projector, typically in the dashboard area, images are projected onto the windshield, reflected there and perceived by the driver as a virtual image (seen from him) behind the windshield. Important information can be projected into the driver's field of vision, such as the current driving speed, navigation or warning information, which the driver can perceive without having to take his eyes off the road. Head-up displays can make a significant contribution to increasing road safety.

The DE 10 2014 220 189 A1 discloses a HUD projection arrangement that is operated with p-polarized radiation to generate a HUD image. Since the angle of incidence is typically close to the Brewster angle and p-polarized radiation is therefore only reflected to a small extent by the glass surfaces, the windshield has a reflective structure that can reflect p-polarized radiation in the direction of the driver. The proposed reflective structure is a single metallic layer with a thickness of 5 nm to 9 nm, for example made of silver or aluminum, which is applied to the outside of the inner pane facing away from the interior of the car.

In the US 2004/0135742 A1 Also disclosed is a HUD projection assembly that operates on p-polarized radiation to produce a HUD image and has a reflective structure capable of reflecting p-polarized radiation toward the driver. As a reflective structure, the in the US 5,882,774 A disclosed multilayer polymer layers proposed.

Both head-up displays and other display applications or functional elements with electrically switchable optical properties are often used in the form of functional films. This has the advantage that the functional film can be easily inserted into the layer stack when laminating a composite pane and can be prefabricated independently of the production of the composite pane. Functional films are generally based on one or more polymeric carrier films on or between which functional layers are applied. During lamination, these polymeric carrier films are bonded to the panes of the composite pane via thermoplastic composite films.

Modern vehicles are also often equipped with cameras, such as video cameras or night vision cameras, whose signals are used to support the driver. Forward-facing cameras are typically mounted on the interior surface of the windshield, typically centered near the top edge.

Cameras are usually attached to a composite pane, for example designed as a windshield, so that their detection direction is horizontal. Since the windshield is installed in the vehicle at a steep angle, for example with an installation angle of 60° to the vertical, the detection direction of the camera forms a very acute angle of approximately 30° with the windshield. This results in a comparatively large, essentially trapezoidal, so-called camera window in the windshield. The camera window is the area of a composite pane through which radiation passing through the composite pane is detected by the camera. The camera window of the composite pane is the area of the composite pane that lies in the camera's beam path.

Functional films prevent cameras that are attached to the composite pane and whose beam path runs through the functional film laminated in the composite pane from working error-free. In order to ensure that the camera works correctly, the functional films used in the composite pane are usually provided with a recess in the area of the camera window of the composite pane.

Since camera windows are essentially trapezoidal, as described above, the recesses in the functional films often also have a trapezoidal shape. However, trapezoidal recesses in functional films can lead to defects such as fold defects or crack formation in the functional film, especially if the composite pane is a curved composite pane.

The present invention is based on the object of providing an improved composite pane with a functional film and a camera window.

The object of the present invention is achieved according to the invention by a composite pane according to claim 1. Preferred embodiments emerge from the subclaims.

The composite pane according to the invention comprises an outer pane, a first thermoplastic intermediate layer, a functional film, a second thermoplastic intermediate layer and an inner pane. The functional film is arranged between the outer pane and the inner pane. The first thermoplastic intermediate layer is arranged between the outer pane and the functional film and the second thermoplastic intermediate layer is arranged between the functional film and the inner pane.

The composite pane according to the invention has an upper pane edge and a lower pane edge and two lateral side edges. The upper edge of the pane refers to the side edge of the composite pane that is intended to point upwards in the installed position. The lower edge of the pane refers to the side edge that is intended to point downwards in the installed position. If the composite pane is the windshield of a motor vehicle, the upper edge of the pane is often referred to as the roof edge and the lower edge of the pane is often also referred to as the engine edge.

The outer pane, the inner pane, the first thermoplastic intermediate layer, the second thermoplastic intermediate layer and the functional film each have an outside and an interior surface, an upper edge, a lower edge and two side edges. The top edge refers to the edge that is intended to point upwards in the installed position. The lower edge refers to the edge that is intended to point downwards in the installed position. For the purposes of the invention, the outside surface refers to the main surface which is intended to face the external environment in the installed position. For the purposes of the invention, the interior-side surface refers to the main surface which is intended to face the interior in the installed position. The interior surface of the outer pane and the outside surface of the inner pane face each other and are connected to one another by the first thermoplastic intermediate layer and the second thermoplastic intermediate layer.

The area of a composite pane that is arranged in the detection beam path of a camera, or is intended to be arranged in the detection beam path of a camera, is referred to as the camera window. Radiation that passes through the composite pane in the camera window is detected by the camera.

According to the invention, the composite pane has a camera window. In addition, the functional film has a recess with radii greater than or equal to 40 mm and the camera window is arranged completely within the recess when viewed vertically through the composite pane according to the invention.

It was found that with a recess with radii greater than or equal to 40 mm, the formation of wrinkles around the recess can be prevented or at least reduced and tearing of the functional film starting from the recess can be prevented.

The camera window therefore completely overlaps with the cutout in the functional film. For the purposes of the invention, the description that an element A completely overlaps with an element B means that the orthogonal projection from element A to the surface plane of element B is arranged completely within element B.

The recess is preferably designed in the shape of an oval. The term oval refers to a flat, rounded, convex figure.

In one embodiment of the composite pane according to the invention, the recess designed in the shape of an oval has straight sections. Such ovals can be composed of circular arcs and straight lines.

The recess can be arranged at a distance from the edges of the functional film, ie from the upper edge, the lower edge and the side edges of the functional film. The advantage of a recess spaced from the edges of the functional film is that the basic contour of the functional film is not violated.

Alternatively, the recess can also be arranged directly adjacent to the upper edge of the functional film. A recess arranged immediately adjacent to the upper edge of the functional film can also be viewed as a partial cut back of the functional film starting from the upper edge of the functional film.

In a preferred embodiment of the composite pane according to the invention, the recess is designed in the form of an oval, which has straight pieces, in particular two straight pieces arranged parallel to one another.

In a particularly preferred embodiment of the composite pane according to the invention, the recess is in the form of an oval, which has straight pieces, in particular two straight pieces arranged parallel to one another, and is arranged at a distance from the edges of the functional film.

The functional film is preferably a film which, in the initial state, i.e. before it is laminated into the composite pane, has a shrinkage of 1% to 10% along a first direction R1 in the plane and a shrinkage of 1% to 10% along a second direction R2 in the plane when heated to 130 ° C for 15 minutes.

Particularly preferably, the functional film is a film which has asymmetrical shrinkage, i.e. in which the shrinkage along the first direction R1 is greater than the shrinkage along the second direction R2 or the shrinkage along the second direction R2 is greater than the shrinkage is along the first direction R1.

The second direction R2 preferably runs perpendicular to the first direction R1.

In particular in the case of curved composite panes, especially in the case of curved composite panes which have a functional film with asymmetrical shrinkage, with a recess with radii greater than or equal to 40 mm, the formation of wrinkles around the recess can be prevented or at least reduced and tearing of the functional film starting from the Recess can be prevented.

A wide variety of single-layer or multi-layer films known to those skilled in the art can be used as functional films.

The functional film is preferably a film which is based on polyethylene terephthalate (PET), polyethylene (PE), polyamide (PA), polymethyl methacrylate (PMMA), triacetylcellulose (TAC) and/or polycarbonate and/or copolymers or mixtures thereof, in particular on polyethylene terephthalate ( PET), polyamide (PA) and/or cellulose triacetate (TAC).

The functional film thus preferably comprises at least one carrier film based on polyethylene terephthalate (PET), polyethylene (PE), polyamide (PA), polymethyl methacrylate (PMMA), triacetylcellulose (TAC) and / or polycarbonate and / or copolymers or mixtures thereof, particularly preferably one based on Polyethylene terephthalate (PET) based carrier film.

Well-known functional films that are used in the automotive sector are, for example, HUD films, display films or multilayer optical films.

The functional film can also be designed as a film with a coating that reflects infrared radiation.

The functional film is particularly preferably a reflective film that can be used as a HUD film. Such a reflective film is preferably metal-free and suitable for reflecting at least 5%, preferably 10% to 50%, particularly preferably 15% to 30%, in particular 20% to 25%, of p-polarized light striking the film. This is particularly advantageous in terms of a good HUD image.

The reflective film is preferably a polyethylene terephthalate (PET) based film that is coated with a copolymer layer stack based on PET and/or polyethylene naphthalate (PEN). The coating is preferably applied to the interior surface, ie the surface that faces the vehicle interior. Suitable reflective films are, for example, in US 5,882,774 A described.

The functional film can be between 20 µm (micrometers) and 2 mm, preferably between 20 µm and 120 µm, thick. The thickness of the functional film is constant over the entire length, so the functional film has a rectangular cross section. The functional film is therefore not a wedge film.

The first thermoplastic interlayer and the second thermoplastic interlayer can independently contain or consist of at least polyvinyl butyral (PVB), ethylene vinyl acetate (EVA), polyurethane (PU) or mixtures or copolymers or derivatives thereof, preferably polyvinyl butyral (PVB).

The first thermoplastic intermediate layer and the second thermoplastic intermediate layer can be formed independently of one another by a single film or by more than one film.

The first thermoplastic intermediate layer and the second thermoplastic intermediate layer can be between 20 μm (micrometers) and 2 mm thick. The thickness of the first thermoplastic intermediate layer and the thickness of the second thermoplastic intermediate layer is constant over the entire length, so the intermediate layers have a rectangular cross section. The thermoplastic intermediate layers are therefore not wedge films.

In a preferred embodiment, the first thermoplastic intermediate layer has a thickness of 200 μm to 1000 μm, preferably 300 μm to 850 μm, and the second thermoplastic intermediate layer has a thickness between 20 μm (micrometers) and 2 mm, preferably between 10 μm and 120 µm, particularly preferably between 15 µm and 90 µm, very particularly preferably between 20 µm and 75 µm.

In a particularly preferred embodiment, the first thermoplastic intermediate layer has a thickness of 200 μm to 1000 μm, preferably 300 μm to 850 μm, and the second thermoplastic intermediate layer has a thickness between 10 μm and 120 μm, preferably between 15 μm and 90 μm, particularly preferably between 20 µm and 75 µm.

The second thermoplastic intermediate layer and the functional film can also be present as a so-called bilayer and can be introduced as this into a stacking sequence for producing a composite pane according to the invention. This means that the second thermoplastic intermediate layer and the functional film do not necessarily have to be introduced into the stacking sequence as two individual layers one after the other, but can be introduced into the stacking sequence as a common bilayer.

The functional film preferably extends over the entire surface of the composite pane minus the recess or essentially over the entire surface of the composite pane minus the recess. Essentially over the entire surface of the composite pane means over the entire surface of the composite pane minus a peripheral edge area of, for example, 20 mm.

Particularly preferably, the functional film extends over the entire surface of the composite pane minus a peripheral edge area of, for example, 20 mm and minus the recess.

A composite pane according to the invention can additionally comprise a covering print, in particular made of a dark, preferably black, enamel. The cover print is in particular a peripheral, i.e. frame-like, cover print, which is thus arranged in a peripheral edge region, and/or a cover print which is arranged in an area surrounding the camera window. The peripheral masking print primarily serves as UV protection for the assembly adhesive of the composite pane. The covering print can be opaque and over the entire surface. The covering print can also be semi-transparent, at least in sections, for example as a dot grid, stripe grid or checkered grid. Alternatively, the covering pressure can also have a gradient, for example from an opaque covering to a semi-transparent covering. The covering pressure is usually applied to the interior surface of the outer pane or to the interior surface of the inner pane.

In a preferred embodiment, the outer pane and/or the inner pane has a covering print in a peripheral edge region and in an area surrounding the camera window.

In a particularly preferred embodiment of the composite pane according to the invention, the recess is designed such that the edge of the functional film adjacent to the recess is spaced at least 3 mm, preferably 3 mm to 5 mm, from the camera window when viewed vertically through the composite pane. In this way, an edge effect of the functional film is prevented from occurring in the area of the camera window, which would have a detrimental effect on the optics in the area of the camera window.

The first thermoplastic intermediate layer and the second thermoplastic intermediate layer can independently of one another also have an intermediate layer with acoustically dampening properties, an intermediate layer that reflects infrared radiation, an intermediate layer that absorbs infrared radiation, an intermediate layer that absorbs UV radiation, an intermediate layer that is colored at least in sections and / or an intermediate layer that is tinted at least in sections be. So For example, the first thermoplastic intermediate layer or the second thermoplastic intermediate layer can also be a belt filter film.

The outer pane and the inner pane are preferably made of glass, in particular of soda lime glass, which is common for window panes. In principle, the panes can also be made from other types of glass (for example borosilicate glass, quartz glass, aluminosilicate glass) or transparent plastics (for example polymethyl methacrylate or polycarbonate). The thickness of the slices can vary widely. Discs with a thickness in the range from 0.8 mm to 5 mm, preferably from 1.4 mm to 2.5 mm, are preferably used, for example with the standard thicknesses of 1.6 mm or 2.1 mm. However, it is also possible for the outer pane and/or the inner pane to have a thickness of 0.55 mm or 0.7 mm.

The outer pane and the inner pane can independently be clear and colorless, but also tinted or colored. In a preferred embodiment, the total transmission through the laminated glass is greater than 70%. The term total transmission refers to the procedure for testing the light transmission of motor vehicle windows specified by ECE-R 43, Annex 3, S 9.1.

The outer pane and the inner pane can be independently non-prestressed, partially prestressed or prestressed. If at least one of the panes is to have a prestress, this can be a thermal or chemical prestress.

In a preferred embodiment of the composite pane according to the invention, the outer pane and the inner pane are curved panes.

The outer pane and/or the inner pane may have anti-reflective coatings, non-stick coatings, anti-scratch coatings, photocatalytic coatings, electrically heatable coatings, solar control coatings and/or low-E coatings.

The height of the outer pane and the inner pane, i.e. in the case of a windshield, the distance between the roof edge of the composite pane and the engine edge of the composite pane, is preferably between 0.8 m and 1.40 m, particularly preferably between 0.9 m and 1.25 m It goes without saying that the height of the first thermoplastic intermediate layer, the second thermoplastic intermediate layer and the functional film is preferably between 0.8 m and 1.40 m, particularly preferably between 0.9 m and 1.25 m.

The composite window according to the invention can be a vehicle window. A vehicle window is intended to separate a vehicle interior from an external environment. A vehicle window is therefore a window pane that is inserted into a window opening in the vehicle body or is intended for this purpose. A composite pane according to the invention is in particular a windshield of a motor vehicle.

In the case of a vehicle window, the term inner window refers to the window which is intended to face the interior of the vehicle when installed. The outer window refers to the window which is intended to face the external environment of the vehicle when installed.

The composite pane according to the invention is preferably bent in one or more directions in space, as is usual for motor vehicle windows, with typical radii of curvature in the range from approximately 10 cm to approximately 40 m. The laminated glass can also be flat, for example if it is intended as a pane for buses, trains or tractors.

1. (a) eine Außenscheibe mit einer Oberkante, einer Unterkante und zwei Seitenkanten, eine erste thermoplastische Zwischenschicht mit einer Oberkante, einer Unterkante und zwei Seitenkanten und einem rechteckigen Querschnitt, eine Funktionsfolie mit einer Oberkante, einer Unterkante und zwei Seitenkanten und einem rechteckigen Querschnitt, eine zweite thermoplastische Zwischenschicht mit einer Oberkante, einer Unterkante und zwei Seitenkanten und einem rechteckigen Querschnitt und eine Innenscheibe mit einer Oberkante, einer Unterkante und zwei Seitenkanten bereitgestellt werden;
2. (b) eine Stapelfolge gebildet wird, in der die Funktionsfolie zwischen der Außenscheibe und der Innenscheibe angeordnet ist, die erste thermoplastische Zwischenschicht zwischen der Außenscheibe und der Funktionsfolie angeordnet ist und die zweite thermoplastische Zwischenschicht zwischen der Funktionsfolie und der Innenscheibe angeordnet ist;
3. (c) die Stapelfolge kalt entlüftet wird;
4. (d) die kalt entlüftete Stapelfolge durch Lamination verbunden wird;

wobei die Verbundscheibe ein Kamerafenster aufweist,
und wobei die Funktionsfolie eine Aussparung mit Radien größer/gleich 40 mm aufweist und das Kamerafenster in senkrechter Durchsicht durch die Verbundscheibe vollständig innerhalb der Aussparung angeordnet ist.The composite pane according to the invention can be produced using a method wherein at least

1. (a) an outer pane with an upper edge, a lower edge and two side edges, a first thermoplastic intermediate layer with an upper edge, a lower edge and two side edges and a rectangular cross section, a functional film with an upper edge, a lower edge and two side edges and a rectangular cross section, a second thermoplastic intermediate layer having a top edge, a bottom edge and two side edges and a rectangular cross section and an inner pane having a top edge, a bottom edge and two side edges are provided;
2. (b) a stacking sequence is formed in which the functional film is arranged between the outer pane and the inner pane, the first thermoplastic intermediate layer is arranged between the outer pane and the functional film and the second thermoplastic intermediate layer is arranged between the functional film and the inner pane;
3. (c) the stacking sequence is vented cold;
4. (d) the cold vented stacking sequence is connected by lamination;

wherein the composite pane has a camera window,
and wherein the functional film has a recess with radii greater than or equal to 40 mm and the camera window is arranged completely within the recess when viewed vertically through the composite pane.

The recess is preferably made in the functional film using a plotter. Using a plotter you can cut with very sharp edges and thus avoid fraying of the edge of the functional film adjacent to the recess.

If the composite pane is to be curved, the outer pane and the inner pane are subjected to a bending process before lamination. The outer pane and the inner pane are preferably bent congruently together (i.e. at the same time and using the same tool), because this means that the shape of the panes is optimally coordinated with one another for the later lamination. Typical temperatures for glass bending processes are, for example, 500°C to 700°C.

A venting process is necessary to remove the additional air from the stacking sequence and ensure the functionality of the glazing structure. Cold deaeration under vacuum is carried out at a temperature in the range of 10 to 40 ° C, preferably 12 to 30 ° C, with a holding time of at least 30 minutes, but this can be extended up to a few hours depending on the dimension and type of structure.

The stacking sequence can be lamination using common lamination processes. For example, so-called autoclave processes can be carried out at an increased pressure of about 10 bar to 15 bar and temperatures of 130 ° C to 145 ° C for about 2 hours. Alternatively, autoclave-free processes are also possible. Known vacuum bag or vacuum ring processes work, for example, at around 200 mbar and 80 ° C to 110 ° C.

Alternatively, vacuum laminators can be used. These consist of one or more heatable and evacuable chambers in which the first pane and the second pane are laminated within, for example, about 60 minutes at reduced pressures of 0.01 mbar to 800 mbar and temperatures of 80 ° C to 170 ° C.

The functional film provided in step a) is preferably a film which has a shrinkage of 1% to 10% along a first direction R1 in the plane and a shrinkage of 1% to 10% along a second direction R2 in the plane when heated to 130°C for 15 minutes.

Using the method, a functional film with a camera window can be laminated into a composite pane with no or almost no creases and the risk of the functional film tearing from the recess is significantly reduced. This is particularly true for areas with increased complexity in curved composite panes.

The preferred embodiments of the composite pane according to the invention described above also apply correspondingly to the method for producing a composite pane according to the invention and vice versa.

A composite window according to the invention can be used as a vehicle window in means of transport on land, in the air or on water, in particular in motor vehicles and in particular in a windscreen, especially for a head-up display in a motor vehicle.

The invention also relates to an arrangement comprising a composite pane according to the invention and a camera for detecting radiation passing through the composite pane in the camera window.

The invention is explained in more detail below using drawings and exemplary embodiments. The drawings are schematic representations and not to scale. The drawings do not limit the invention in any way.

• 1 eine Draufsicht auf eine Ausführungsform einer erfindungsgemäßen Verbundscheibe;
• 2 einen Querschnitt durch die Verbundscheibe gemäß 1 entlang der Schnittlinie A-A`;
• 3 eine Draufsicht auf eine weitere Ausführungsform einer erfindungsgemäßen Verbundscheibe;
• 4 einen Querschnitt durch die Verbundscheibe gemäß 3 entlang der Schnittlinie A-A`;
• 5 eine Draufsicht auf eine weitere Ausführungsform einer erfindungsgemäßen Verbundscheibe;
• 6 eine Draufsicht auf eine weitere Ausführungsform einer erfindungsgemäßen Verbundscheibe;
• 7 einen Querschnitt durch die Verbundscheibe gemäß 6 entlang der Schnittlinie A-A`;
• 8 einen Querschnitt durch eine weitere Ausführungsform einer erfindungsgemäßen Verbundscheibe; und
• 9 ein Flussdiagramm einer Ausführungsform eines Verfahrens.

Show it:

• 1 a top view of an embodiment of a composite pane according to the invention;
• 2 a cross section through the composite pane 1 along the section line AA`;
• 3 a top view of a further embodiment of a composite pane according to the invention;
• 4 a cross section through the composite pane 3 along the section line AA`;
• 5 a top view of a further embodiment of a composite pane according to the invention;
• 6 a top view of a further embodiment of a composite pane according to the invention;
• 7 a cross section through the composite pane 6 along the section line AA`;
• 8th a cross section through a further embodiment of a composite pane according to the invention; and
• 9 a flowchart of an embodiment of a method.

In 1 is a top view of an embodiment of a composite pane 1 according to the invention shown and in 2 is a cross section through the composite pane 1 according to 1 shown along the section line AA`. The composite pane 1 is constructed from an outer pane 2, a first thermoplastic intermediate layer 3, a functional film 4, a second thermoplastic intermediate layer 5 and an inner pane 6. The functional film 4 is arranged between the outer pane 2 and the inner pane 6, which is the first thermoplastic intermediate layer 3 arranged between the outer pane 2 and the functional film 4 and the second thermoplastic intermediate layer 5 is arranged between the functional film 4 and the inner pane 6. The outer pane 2 and the inner pane 6 are connected to one another via the first thermoplastic intermediate layer 3 and the second thermoplastic intermediate layer 5, between which the functional film 4 is arranged.

The ones in the 1 and 2 Composite pane 1 shown is, for example, a windshield of a passenger car. In the installed position, the outer pane 2 faces the external environment, the inner pane 6 faces the vehicle interior. The lower pane edge U of the composite pane 1 is arranged downwards in the direction of the engine of the passenger car, the upper pane edge O of the composite pane 1 is arranged upwards in the direction of the roof, the two side pane edges S are arranged laterally.

The composite pane 1 has a camera window 7, which is in the 1 and 2 shown embodiment of a composite pane 1 according to the invention is trapezoidal.

The functional film 4 has a recess 8, which is in the 1 and 2 shown embodiment of a composite disk 1 according to the invention is designed in the form of an oval, which has two straight pieces arranged parallel to one another. The shape of the recess 8 therefore corresponds to a rectangle with semicircles placed on the shorter sides.

When viewed vertically through the composite pane 1, the camera window 7 is arranged completely within the recess 8 in the functional film 4. The edge of the area that forms the camera window 7 is in the 1 provided with the reference number K7 and shown by a dashed line. The edge of the functional film 4 adjacent to the recess 8 is in the 1 designated by the reference number K8 and shown as a continuous line.

The outer pane 2 and the inner pane 6 consist, for example, of soda-lime glass. The outer pane 2 has a thickness of 2.1 mm, for example, and the inner pane 6 has a thickness of 1.6 mm, for example.

The first thermoplastic intermediate layer 3 is, for example, an intermediate layer made of PVB with acoustic damping properties and has a thickness of 0.81 mm. The second thermoplastic intermediate layer 5 consists, for example, of PVB and has a thickness of 50 μm (micrometers).

The functional film 4 is in the 1 and Fig. 2 shown embodiment of the composite pane 1, for example, a polyethylene terephthalate (PET) based reflective film, which is coated with a copolymer layer stack based on PET and polyethylene naphthalate (PEN) and is suitable for a proportion of 20% to 25% of impinging on the functional film to reflect p-polarized light. The functional film 4, for example, has a thickness between 20 μm and 120 μm.

The functional film 4 points in the 1 and the 2 Embodiment shown exhibits a shrinkage of 1% to 10% along the first in-plane direction R1 and a shrinkage of 1% to 10% along a second in-plane direction R2 when heated to 130 ° C for 15 minutes. In the in the 1 and 2 In the embodiment shown, the first direction R1 corresponds to the shortest connecting line between the side edges S4 of the functional film and the second direction R2 corresponds to the shortest connecting line between the lower edge U4 and the upper edge O4 of the functional film 4. The second direction R2 corresponds to that in the 1 shown embodiment of the reflection axis of the functional film 4.

The outer pane 2, the inner pane 6, the first thermoplastic intermediate layer 3 and the second thermoplastic intermediate layer 5 have the same external dimensions so that the side edges S2, the upper edge O2 and the lower edge U2 of the outer pane 2, the side edges S6, the upper edge O6 and the lower edge U6 of the inner pane 6, the side edges S3, the upper edge O3 and the lower edge U3 of the first thermoplastic intermediate layer 3 and the side edges S5, the upper edge O5 and the lower edge U5 of the second thermoplastic intermediate layer 5 lie flush one above the other when viewed through the composite pane 1.

The functional film 4 extends in the 1 and 2 Embodiment shown over the entire surface of the composite pane minus a circumferential edge area of 20 mm and minus the recess 8. Thus, when viewed vertically through the composite pane, the side edges S4 of the functional film 4 are spaced by 20 mm from the respective side edges S of the composite pane 1, the upper edge O4 of the functional film 4 is spaced by 20 mm from the upper edge of the pane O of the composite pane 1 and the lower edge U4 is spaced by 20 mm from the lower edge of the pane U of the composite pane 1.

In 3 a top view of a further embodiment of a composite pane 1 according to the invention is shown and in 4 is a cross section through the composite pane 1 according to 3 shown along the section line AA`. The ones in the 3 and 4 Embodiment shown differs from that in the 1 and 2 shown only to the effect that the recess 8 in the functional film 4 is formed from a semicircle with two straight pieces arranged parallel to one another and is arranged immediately adjacent to the upper edge O4 of the functional film 4. The recess 4 can therefore also be seen as a cut back of the functional film 4 starting from the upper edge O4 in the form of an oval segment.

In 5 a top view of a further embodiment of a composite pane 1 according to the invention is shown. The ones in the 5 The embodiment shown differs from that in the 1 shown only to the extent that the recess 8 in the functional film 4 is arranged with one of the straight pieces immediately adjacent to the upper edge O4 of the functional film 4. The recess 4 can therefore also be viewed as a cut back of the functional film 4 starting from the upper edge O4 in the form of an oval with two parallel straight pieces.

In 6 a top view of a further embodiment of a composite pane 1 according to the invention is shown and in 7 is a cross section through the composite pane 1 according to 6 shown along the section line AA`. The ones in the 6 and 7 Embodiment shown differs from that in the 1 and 2 shown only to the extent that the composite pane 1 has a covering pressure 9 on the inside surface of the outer pane 2. The cover print 9 is arranged in a peripheral edge area and in an area surrounding the camera window 7. The cover print 9 is, for example, a black enamel. For better visibility, the cover print is 9 in the 6 and 7 shown in gray. Alternatively or additionally, the covering pressure 9 can also be applied to the inside surface of the inner pane 6.

8th shows a cross section through a further embodiment of a composite pane 1 according to the invention. The in 8th The embodiment shown in cross section differs from that in the 7 shown in cross section only to the effect that the functional film 4 has a thickness of 50 μm and the second thermoplastic intermediate layer 5 has a thickness of 25 μm and were laminated into the composite pane 1 in the form of a bilayer.

9 shows a flowchart of an embodiment of a method for producing a composite pane 1 according to the invention.

The method includes first step S1, in which an outer pane 2 with an upper edge O2, a lower edge U2 and two side edges S2, a first thermoplastic intermediate layer 3 with an upper edge O3, a lower edge U3 and two side edges S3 and a rectangular cross section, a functional film 4 with an upper edge O4, a lower edge U4 and two side edges S4 and a rectangular cross section, a second thermoplastic intermediate layer 5 with an upper edge O5, a lower edge U5 and two side edges S5 and a rectangular cross section and an inner pane 6 with an upper edge O6, a lower edge U6 and two side edges S6 are provided.

In a second step S2, a stacking sequence is formed in which the functional film 4 is arranged between the outer pane 2 and the inner pane 6, the first thermoplastic intermediate layer 3 is arranged between the outer pane 2 and the functional film 4 and the second thermoplastic intermediate layer 5 between the functional film 4 and the inner pane 6 is arranged

In a third step S3, the stacking sequence is vented cold.

In a fourth step S4, the cold-vented stacking sequence is connected by lamination.

The composite pane 1 has a camera window 7, the functional film 4 has a recess 8 with radii greater than or equal to 40 mm and the functional film 4 is arranged in the stacking sequence in such a way that the camera window 7 can be viewed vertically through the stacking sequence and thus also in a vertical View through the composite pane 1 is arranged completely within the recess 8.

The composite pane according to the invention and the method have clear advantages over a composite pane with a functional film with a trapezoidal recess and the method for producing this.

The formation of wrinkles around a trapezoidal recess and the tearing of the functional film starting from a trapezoidal recess are avoided by a recess with radii greater than or equal to 40 mm.

List of reference symbols:

1

Composite disc

2

Outer pane

3

first thermoplastic intermediate layer

4

Functional film

5

second thermoplastic intermediate layer

6

inner pane

7

Camera window

8th

recess

9

cover pressure

O

upper edge of the disc

U

lower edge of the window

S

lateral edge of the window

02

Top edge of the outer pane

U2

Lower edge of the outer pane

S2

Side edge of the outer pane

03

Top edge of the first thermoplastic intermediate layer

U3

Lower edge of the first thermoplastic intermediate layer

S3

Side edge of the first thermoplastic intermediate layer

04

Top edge of the functional film

U4

Lower edge of the functional film

S4

Side edge of the functional film

05

Top edge of the second thermoplastic intermediate layer

U5

Lower edge of the second thermoplastic intermediate layer

S5

Side edge of the second thermoplastic intermediate layer

06

Top edge of the inner pane

U6

Lower edge of the inner pane

S6

Side edge of the inner pane

K7

Edge of the camera window area

K8

edge of the functional film adjacent to the recess

A-A`

cutting line

QUOTES INCLUDED IN THE DESCRIPTION

This list of documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• JP 2015024929 A [0006]
• DE 102014220189 A1 [0008]
• US 2004/0135742 A1 [0009]
• US 5882774 A [0009, 0040]

Claims (13)

Composite pane (1) with an upper pane edge (O), a lower pane edge (U) and two side pane edges (S) at least comprising - an outer pane (2) with an upper edge (O2), a lower edge (U2) and two side edges (S2), - a first thermoplastic intermediate layer (3) with an upper edge (O3), a lower edge (U3) and two side edges (S3), - a functional film (4) with a top edge (O4), a bottom edge (U4) and two side edges (S4), - a second thermoplastic intermediate layer (5) with an upper edge (O5), a lower edge (U5) and two side edges (S5), and - an inner pane (6) with an upper edge (O6), a lower edge (U6) and two side edges (S6), the functional film (4) having a rectangular cross section and being arranged between the outer pane (2) and the inner pane (6). , the first thermoplastic intermediate layer (3) has a rectangular cross section and is arranged between the outer pane (2) and the functional film (4), the second thermoplastic intermediate layer (5) has a rectangular cross section and is arranged between the functional film (4) and the inner pane (6), the composite pane (1) has a camera window (7), and wherein the functional film (4) has a recess (8) with radii greater than or equal to 40 mm and the camera window (7) is arranged completely within the recess (8) when viewed vertically through the composite pane (1). Composite disc (1). Claim 1 , wherein the recess (8) is designed in the shape of an oval. Composite disc (1). Claim 2 , wherein the recess (8) designed in the shape of an oval has straight sections. Composite disc (1) according to one of the Claims 1 until 3 , wherein the recess (8) is arranged at a distance from the upper edge (O4), the lower edge (U4) and the side edges (S4) of the functional film. Composite disc (1) according to one of the Claims 1 until 3 , wherein the recess (8) is arranged immediately adjacent to the upper edge (O4) of the functional film (4). Composite disc (1) according to one of the Claims 1 until 5 , wherein the functional film (4) is a film which, in the initial state, has a shrinkage of 1% to 10% along a first direction (R1) in the plane and a shrinkage of 1% to 10% along a second direction (R2) in the Level when heated to 130 ° C for 15 minutes and preferably the shrinkage along the first direction (R1) is greater than the shrinkage along the second direction (R2) or the shrinkage along the second direction (R2) is greater than that Shrinkage along the first direction (R1). Composite pane according to one of the Claims 1 until 6 , wherein the functional film (4) is a film based on polyethylene terephthalate (PET), polyethylene (PE), polyamide (PA), polymethyl methacrylate (PMMA), triacetylcellulose (TAC) and / or polycarbonate and / or copolymers or mixtures thereof, in particular based on polyethylene terephthalate (PET), polyamide (PA) and/or cellulose triacetate (TAC). Composite disc (1) according to one of the Claims 1 until 7 , wherein the functional film (4) is a HUD film, a display film, an optical multilayer film or a film with a coating that reflects infrared radiation. Composite disc (1) according to one of the Claims 1 until 8th , wherein the functional film (4) is a reflective film which is suitable for a proportion of 10% to 50%, preferably from 15% to 30%, particularly preferably 20% to 25%, of p-polarized light incident on the reflective film reflect. Composite disc (1) according to one of the Claims 1 until 9 , whereby the functional film (4) extends over the entire surface of the composite pane (1) minus a circumferential edge area of 20 mm and minus the recess (8). Composite disc (1) according to one of the Claims 1 until 10 , wherein the outer pane (2) and/or the inner pane (6) has a covering pressure (9) in a peripheral edge area and in an area surrounding the camera window (7). Composite disc (1) according to one of the Claims 1 until 11 , wherein the recess (8) is designed such that the edge (K8) of the functional film (4) adjacent to the recess (8) is spaced at least 3 mm from the camera window (7) when viewed vertically through the composite pane (1). Arrangement comprising a composite pane (1) according to one of Claims 1 until 12 and a camera for detecting radiation passing through the composite pane (1) in the camera window (7).

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