Laminated pane assembly having a sensor window

Abstract

The present invention relates to a laminated pane assembly (100) having a sensor window (4), at least comprising: • a sensor holding device (5), which is attached to a second surface (IV) of the inner pane (2) and in which at least one sensor of a vehicle driving assistance system is arranged, • at least one optically transparent sensor window (2) of the laminated pane (10), through which the beam path of the sensor (3) passes, • a heating device (6), wherein the heating device (6) has at least one radiation source (7) in the infrared wavelength range and is arranged on the sensor holding device (5), and wherein the radiation source (7) is arranged in a recess in the sensor holding device (5).

Description

[0001] Composite pane arrangement with sensor window

[0002] The invention relates to a composite pane arrangement with a sensor window, in particular for camera systems and methods for controlling a heating device of the sensor window.

[0003] Laminated glass panels made of two or more glass or polymer panes are used in vehicles as windshields, rear windows, side windows, and roof windows. Individual sides of the panes can be coated with one or more functional coatings that exhibit infrared-reflecting, anti-reflective, or low-E properties.

[0004] Modern vehicles are increasingly equipped with sensors, particularly a variety of driver assistance systems with optical sensors. These include optical cameras, but also radar systems, ultrasonic sensors, and Light Detection and Ranging (LiDaR). Sensor systems are placed in motor vehicles behind the windshield in the passenger compartment. They thus provide a good view of the vehicle's surroundings and can detect dangerous situations and obstacles in traffic in a timely manner. To ensure the correct functioning of driver assistance systems, the vehicle's surroundings must be recorded as accurately as possible.

[0005] Typically, the sensor system is protected from the elements by suitable windscreens. These windscreens should be as clean and fog-free as possible to ensure sensor functionality. Since fogging and icing significantly impact the transmission of electromagnetic waves, the windscreen should be cleared of these as quickly as possible. Wiper systems ensure that the windscreen is free of water droplets and protective particles. However, they are rendered useless when icy, so if necessary, a short-term heating of the affected windscreen segment, which serves as the camera's field of view, is provided.

[0006] EP 1 605 729 A2 discloses an electrically heated windshield with a camera window. The camera window is kept fog- and ice-free by a heating device. The heating element is laminated into the windshield at the position of the camera window, with the heating element being arranged adjacent to a field of view.

[0007] WO 2022 / 223198 A1 discloses a composite pane for a head-up display with a heatable sensor area, wherein a busbar is arranged on each side of the sensor area for connection to a voltage source, which busbar is connected to an electrically conductive coating.

[0008] WO 2013 / 131700 A1 describes a pane arrangement with an electrically heatable lens hood. The pane arrangement comprises a pane with a housing on the inside of the pane, as well as a radiation receiver, a radiation source, and a lens hood within the housing. The lens hood contains an electrically heatable surface that heats a predetermined area of ​​the pane.

[0009] The object of the present invention is to provide a composite pane arrangement with a sensor window, which ensures rapid demisting or defrosting of a sensor window.

[0010] The object of the present invention is achieved by a composite pane arrangement with a sensor window according to claim 1. Preferred embodiments are evident from the subclaims.

[0011] The composite pane arrangement according to the invention with a sensor window comprises at least one outer pane and one inner pane, which are joined to one another via at least one thermoplastic intermediate layer to form a composite pane, wherein the outer pane comprises a first surface facing away from the intermediate layer and a second surface facing the intermediate layer, and the inner pane comprises a first surface facing the intermediate layer and a second surface facing away from the intermediate layer. Furthermore, the composite pane arrangement comprises a sensor holding device, which is fastened to the second surface of the inner pane and in which at least one sensor of a vehicle driver assistance system is arranged, and at least one optically transparent sensor window of the composite pane, through which the beam path of the sensor passes.Furthermore, the composite pane assembly according to the invention comprises a heating device, which has at least one radiation source in the infrared wavelength range (IR range) and is arranged on the sensor holder. In particular, the heating device is intended to dry the sensor window, in other words, to remove moisture and icing.

[0012] The heating according to the invention, i.e., defrosting or the removal of condensed moisture using IR radiation, can be carried out significantly faster and more efficiently than with previously known heating elements or electrically heated layers. The sensor window dries within a few seconds. Furthermore, the heating device is particularly suitable for laminated panes that do not have a large-area heating function. An additional advantage is that there is no need for electrically heated layers, such as silver layers within the sensor window. This leads to simplified, more cost-effective production of the laminated pane.

[0013] According to a development of the invention, the heating device has at least one radiation source in the IR wavelength range from 0.8 pm to 3.5 pm [micrometers], in particular 1.4 pm to 3 pm. The radiation source can in particular be an IR-LED (IR-emitting diode) which emits radiation with a wavelength (λ) of 1450 nm [nanometers], 1950 nm or 2950 nm. It is precisely in the preferred wavelength range that the absorption and excitation of the water molecules and thus the resulting heating and evaporation are particularly high. Advantageously, it has been shown that in the case of glass, the transmission in the wavelength range from λ = 2.9 pm to λ = 3.1 pm is particularly high at over 70%, in particular at approx. λ = 3.0 pm at approx. 85%, so that the energy can be used efficiently for defrosting and evaporating water.

[0014] This prevents the glass from heating up, reduces the formation of temperature-related stresses in the area of ​​the sensor window, and prevents glass breakage. This type of heating device also has the advantage that the sensor window does not have a metallic coating that could hinder the transmission of electromagnetic waves. Furthermore, the production of the laminated pane is significantly simplified, as a heating device between the outer and inner panes is not required.

[0015] In a preferred embodiment, the radiation source is arranged such that radiation emitted by the radiation source impinges perpendicularly on the second surface of the inner pane. Such an arrangement of the radiation source achieves particularly energy-efficient moisture removal.

[0016] According to the invention, the radiation source is arranged in a recess in the sensor holder. This eliminates the need for additional soldering of connecting elements to the glass of the inner pane. The radiation source is electrically contacted by one or more supply lines. In a further embodiment, the heating device has several, in particular two to 40, radiation sources. This allows defrosting or the removal of condensed moisture, i.e., drying of the laminated pane in the area of ​​the sensor window, to take place particularly quickly. The radiation source can be band-shaped or spot-shaped. Several individual radiation sources can also be arranged next to one another at a distance from one another or in a band-shaped manner (close to one another). If several spot-shaped IR LEDs are arranged next to one another, in other words, a multi-part, band-shaped radiation source can be formed.This makes it possible to flexibly adapt the number and intensity of the radiation sources to the requirements needed for drying the respective sensor window, for example with regard to the spatial geometric conditions and the required energy demand for an efficient effect.

[0017] The sensor bracket can comprise a base part which has means for fastening the sensor and the radiation source. The base part enables reversible attachment of the sensor to the inner pane of the composite pane, wherein the sensor still remains accessible from the vehicle interior. Furthermore, the base part comprises a substantially flat surface which extends from the sensor in the direction of the second surface of the inner pane, in particular downwards. Furthermore, the base part comprises two lateral walls which also extend from the sensor towards the sides in the direction of the second surface of the inner pane. The base part comprises a flat surface which extends from the sensor in the direction of the second surface of the inner pane and on which the at least one radiation source is arranged.In addition, the base part can have openings, notches, ribs, flocking or structures to allow, for example, the passage of connectors such as power cables and / or signal lines required for the operation of the sensor and the radiation source.

[0018] The sensor window is provided for the transmission of electromagnetic radiation for the sensor arranged on the interior side, which is directed onto the interior surface of the inner pane in such a way that it can detect radiation passing through the sensor window from the outside (i.e., across the outer pane toward the inner pane). The sensor can be a camera, a radar sensor, or a LiDaR sensor system, or a combination of these, with the sensor being a sensor with an external view of the vehicle's surroundings. The sensor window can also be referred to as a camera window. It preferably takes up less than 10%, particularly preferably less than 5% of the pane surface. The transparent sensor window can be surrounded by an opaque area.The opaque area can be realized by a masking print formed by a printed and fired enamel, particularly on the interior-facing surface of the outer pane and / or the inner pane. Alternatively, the intermediate layer can be opaque, for example, by using opaque film sections, or an opaque element can be inserted into the intermediate layer.

[0019] The sensor window is preferably shaped like a square, a rectangle, a rhombus, a trapezoid, a hexagon, an octagon, a cross, an oval, or a circle. In a further advantageous embodiment of the invention, the sensor window is designed without a coating.

[0020] The sensor mounting device can be located in the central, upper area of ​​the laminated pane when the laminated pane is installed as a vehicle windshield. Thus, the sensor mounting device does not obstruct the driver's view. Furthermore, a cover can conceal the sensor mounting device, so that the sensor mounting device is located behind the cover from the inside. The sensor mounting device can be made of plastic.

[0021] The outer pane and the inner pane are preferably made of soda-lime glass, which is common for window panes. However, the glass pane can also be made of other types of glass (e.g., borosilicate glass, quartz glass, aluminosilicate glass, or clear plastics, preferably rigid clear plastics, in particular polyethylene, polypropylene, polycarbonate, polymethyl methacrylate, polystyrene, polyamide, polyester, polyvinyl chloride, and / or mixtures thereof). The thickness of the outer pane and the inner pane can vary widely. The panes are preferably in the range of 0.5 mm to 10 mm, preferably 1 mm to 5 mm. The size of the panes can vary widely and depends on the size of the inventive use. The inner pane and optionally the outer pane have areas of 200 cm, which are common in vehicle construction, for example. 2 up to 20 m 2 on.

[0022] The thermoplastic intermediate layer comprises at least one layer of a thermoplastic connecting material, which preferably contains or consists of ethylene-vinyl acetate (EVA), polyvinyl butyral (PVB), or polyurethane (PU), or mixtures, copolymers, or derivatives thereof, particularly preferably PVB. The intermediate layer is typically formed from at least one thermoplastic film. The thickness of the film is preferably 0.3 mm to 2 mm, with standard thicknesses of 0.36 mm and 0.76 mm being particularly common. The intermediate layer can also comprise multiple layers of thermoplastic material and, for example, be formed from multiple polymer films arranged flatly one above the other. The outer pane, the inner pane, and the thermoplastic intermediate layer can be clear and colorless, but also tinted or colored.

[0023] The inner and outer panes are laminated together via the intermediate layer, for example, using autoclave processes, vacuum bag processes, vacuum ring processes, calender processes, vacuum laminators, or combinations thereof. The bonding of the outer and inner panes is typically achieved using heat, vacuum, and / or pressure.

[0024] The composite pane can have any three-dimensional shape. Preferably, the panes are planar or slightly or strongly curved in one or more directions of space.

[0025] The inner pane and the outer pane are preferably transparent, particularly for use as a windshield or rear window of a vehicle or for other applications where high light transmission is desired. A pane is considered transparent within the meaning of the invention if it has a transmission in the visible spectral range of greater than 70%. However, for panes that are not in the driver's traffic-relevant field of vision, such as roof windows, the transmission can also be much lower, for example, greater than 5%.

[0026] The composite pane can additionally comprise a cover 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 circumferential edge region, and / or the cover print that is arranged in an area surrounding the sensor window. The peripheral cover print primarily serves as UV protection for the assembly adhesive of the composite pane. The cover print can be opaque and cover the entire surface. The cover print can also be semi-transparent, at least in sections, for example as a dot matrix, striped matrix or checkered matrix. Alternatively, the cover print can also have a gradient, for example from an opaque covering to a semi-transparent covering.The masking print is applied to the second surface of the outer pane facing the intermediate layer or to the second surface of the inner pane facing away from the intermediate layer. The composite pane assembly with sensor window according to the invention serves to separate an interior space from an external environment. It comprises the inner pane and outer pane as well as the sensor holding device with radiation source. The inner pane refers to the pane which is intended to face the interior of the vehicle in the installed position. The outer pane refers to the pane which is intended to face the external environment of the vehicle in the installed position. In the installed position, the upward-facing edge is referred to as the upper edge (for example, the roof edge in a motor vehicle), and the downward-facing edge of the composite pane (for example, the engine edge in a motor vehicle) is referred to as the lower edge.The edges in between are called side edges.

[0027] The composite pane arrangement can be used in a variety of ways: In the case of a composite pane as a window pane of a vehicle, it can, for example, be a roof pane, in particular a windshield, a rear window, or a side window. The composite pane is particularly preferably a front pane, in particular a windshield.

[0028] The object is further achieved by a method for controlling a heating device of a sensor window in a vehicle by a heating system comprising a composite pane arrangement according to the invention, wherein the radiation source is connected to at least one control unit (controller) and / or on-board electronics, the method comprising the following steps:

[0029] - Detecting moisture within the sensor window on a surface of the outer pane or the inner pane, and

[0030] - Switching on the radiation source in the event that moisture is detected within the sensor window by the moisture sensor, wherein the sensor holding device comprises a base part which has means for fastening the sensor and the radiation source and wherein the radiation source is arranged in the base part such that the radiation emitted by the radiation source strikes the second surface of the inner pane substantially perpendicularly,

[0031] - Switch off the radiation source when the moisture has been removed.

[0032] In another preferred embodiment, the radiation source can be connected to at least one humidity sensor. This can advantageously be used for automated defrosting or the removal of condensed moisture. In addition, icing of the laminated pane or the formation of condensate and the associated visual impairment can also be prevented.

[0033] It goes without saying that the features and the advantages that can be achieved thereby, which have been described with reference to the composite pane arrangement according to the invention, are applicable or transferable to the method according to the invention and vice versa.

[0034] The object is further achieved by a computer-readable storage medium which contains instructions which cause at least one processor to implement a method according to the invention when the instructions are executed by the at least one processor.

[0035] For the computer-readable storage medium, similar advantages and technical effects arise as have been described in connection with the composite pane arrangement and the method.

[0036] A further aspect of the invention comprises the use of the composite pane arrangement according to the invention in means of transport for traffic on land, in the air or on water, in particular in motor vehicles, for example as a windshield.

[0037] The invention is explained in more detail below with reference to figures and exemplary embodiments. The figures are schematic representations and not to scale. The figures do not limit the invention in any way.

[0038] They show:

[0039] Figure 1 is a plan view of a composite pane arrangement according to the invention with a sensor window,

[0040] Figure 2 is an enlarged view of the sensor window from Figure 1, and Figure 3 is a cross-sectional view along the section line AA' from Figure 1.

[0041] Figure 1 shows a plan view of an embodiment of a composite pane arrangement 100 according to the invention. The composite pane arrangement 100 comprises a composite pane 10 which is constructed from an outer pane 1, a thermoplastic intermediate layer 3 and an inner pane 2. The thermoplastic intermediate layer 3 is arranged between the outer pane 1 and the inner pane 2. The composite pane 10 is, for example, a windshield of a passenger car. In the installed position, the outer pane 1 faces the outside environment, while the inner pane 2 faces the vehicle interior 12. In the installed position, the upward-facing edge is referred to as the upper edge O, and the downward-facing edge of the composite pane is referred to as the lower edge U. The edges running in between are referred to as side edges S.

[0042] The composite pane 10 has a sensor window 4, which, in the embodiment of a composite pane 10 according to the invention shown in Fig. 1, is trapezoidal. The outer pane 1 and the inner pane 2 are made, for example, of soda-lime glass. The outer pane 1 has a thickness of 2.1 mm, for example, and the inner pane 2 has a thickness of 1.6 mm, for example. The thermoplastic intermediate layer 3 is made, for example, of PVB with acoustic damping properties and has a thickness of 0.76 mm.

[0043] The composite pane 10 has a cover print 9 on a second surface II of the outer pane 1 facing the intermediate layer. The cover print 9 is arranged in a peripheral edge region and in an area surrounding the sensor window 4. The cover print 9 is, for example, a black enamel. For better visibility, the cover print 9 is shown in gray in Figure 1. Alternatively or additionally, the cover print 9 can also be applied to the first surface III of the inner pane 2 facing the intermediate layer.

[0044] The composite pane assembly 100 further comprises a sensor holder 5 (Figure 3), which is attached to the second surface IV of the inner pane 2 and in which at least one sensor 8 of a vehicle driver assistance system is arranged. The sensor holder 5 can be designed as a plastic housing that is adhesively bonded to the second surface IV of the inner pane 2. The sensor 8 can be an optical camera, a radar system, ultraviolet (UV) sensors, an ultrasonic sensor, or a Light Detection and Ranging (LiDaR) sensor system. The beam path of the sensor 4 can pass through the optically transparent sensor window 4 of the composite pane 10. The composite pane assembly 100 further comprises a heating device 6 for drying the sensor window 4, which has at least one radiation source 7 (Figure 2) in the infrared wavelength range (IR range) and is arranged on the sensor holder 5.

[0045] Figure 2 shows an enlarged view of the sensor window 4 from Figure 1 . The cover pressure

[0046] 9 surrounds the sensor window 4. The heating device 6 comprises 30 radiation sources 7. The radiation sources 7 are so-called IR-emitting diodes (IR-LEDs) that emit radiation with a wavelength (λ) of 1450 nm [nanometers], 1950 nm, or 2950 nm. The individual radiation sources 7 are spaced apart from one another or arranged in a band (close to one another). If several spot-shaped IR-LEDs are arranged next to one another, a multi-part, band-shaped radiation source can be formed.

[0047] Figure 3 shows a cross-section through the composite pane arrangement 100 according to Figure 1 along the section line AA'. In the installed position, the outer pane 1 faces the outside environment, the inner pane 2 faces the vehicle interior 12. The first, outside surface of the outer pane 1 is referred to as side I. The second, inside-side surface of the outer pane 1 is referred to as side II. The second surface II of the outer pane 1 faces the intermediate layer. The first outside surface of the inner pane 2 is referred to as side III. The second inside-side surface of the inner pane 2 is referred to as side IV. The second surface IV of the inner pane 2 faces away from the intermediate layer. The first surface III of the inner pane 2 and the second surface II of the outer pane 1 face one another and are connected to one another via the thermoplastic intermediate layer 3.The second surface IV of the inner pane 2 and the first surface I of the outer pane 1 face away from each other and from the thermoplastic intermediate layer 3.

[0048] The sensor holding device 5 can comprise a base part 5.1, which has means for fastening the sensor 8 and the radiation source 7. The base part 5.1 enables reversible attachment of the sensor 8 to the inner pane 2 of the composite pane 10, wherein the sensor 8 remains accessible from the vehicle interior. Furthermore, the base part 5.1 comprises a substantially flat surface that extends from the sensor in the direction of the second surface IV of the inner pane, in particular downwards. Furthermore, the base part 5.1 comprises two lateral walls that also extend from the sensor to the sides in the direction of the second surface IV of the inner pane 2. The base part 5.1 comprises the flat surface extending from the sensor 8 in the direction of the second surface IV of the inner pane 2, on which surface the at least one radiation source 7 is arranged.Additionally, the base part has openings, notches, ribs, flocking, or structures to allow the passage of connectors such as power cables and / or signal lines required for the operation of the sensor and the radiation source. A flocking can contain fibers, preferably black fibers with a length of up to 1 mm.

[0049] The radiation source 7 is arranged in a recess in the sensor holder 5, particularly in the base part 5.1. Because the radiation source 7 is arranged in the sensor holder 5, additional soldering of connecting elements to the glass of the inner pane 2 is unnecessary. This prevents temperature-related stresses in the glass or even glass breakage in the area of ​​the sensor window. This arrangement of the radiation source 7 enables particularly energy-efficient removal of moisture. The radiation source 7 is electrically connected via one or more supply lines within the sensor holder.

[0050] The heating device 6 can have multiple radiation sources 7. This allows the defrosting or drying of the laminated pane 10 in the area of ​​the sensor window 4 to occur particularly quickly. The radiation sources 7 can be band-shaped or spot-shaped. The individual radiation sources 7 are arranged in the base part 5.1 such that the radiation emitted by the respective radiation source 7 strikes the second surface IV of the inner pane 2 essentially perpendicularly. With such an arrangement, the energy efficiency is particularly high, so that defrosting and evaporation of water begin particularly quickly.

[0051] In contrast to the simplified representation in Figure 3, real windshields are not flat, but curved. This can result in a location-dependent orientation of the radiation sources 7. The composite pane 10 is a windshield that is installed in the vehicle at an installation angle. Outside the sensor window 4, the composite pane 10 can have an electrically conductive, transparent coating. The electrically conductive, transparent coating can be arranged, in particular substantially over the entire surface, outside the camera window on the first surface III of the inner pane 2.

[0052] Surprisingly, it has been shown that such a composite windshield assembly 100 according to the invention achieves significantly faster defrosting and drying of the sensor window compared to previously known windshields.

[0053] 1 inner pane

[0054] 2 outer pane

[0055] 3 Intermediate layer

[0056] 4 sensor windows

[0057] 5 Sensor holding device

[0058] 5.1 Base part of the sensor holder

[0059] 6 Heating device

[0060] 7 Radiation source

[0061] 8 Sensor (Camera)

[0062] 9 Cover print

[0063] 10 Composite pane

[0064] 12 Vehicle interior

[0065] 100 composite pane arrangement

[0066] (O) Upper edge of the composite pane

[0067] (U) Lower edge of the laminated pane

[0068] (S) Side edge of the laminated pane

[0069] (I) first surface of the outer pane facing away from the intermediate layer

[0070] (II) second surface of the outer pane facing the intermediate layer

[0071] (III) first surface of the inner pane facing the intermediate layer

[0072] (IV) second surface of the inner pane facing away from the intermediate layer

Claims

Patent claims 1 . Composite pane arrangement (100) with sensor window (4) comprising at least: • an outer pane (1) and an inner pane (2) which are joined to one another via at least one thermoplastic intermediate layer (3) to form a composite pane (10), wherein the outer pane (1) comprises a first surface (I) facing away from the intermediate layer (3) and a second surface (II) facing the intermediate layer, and the inner pane (2) comprises a first surface (III) facing the intermediate layer and a second surface (IV) facing away from the intermediate layer, • a sensor holding device (5) which is attached to the second surface (IV) of the inner pane (2) and in which at least one sensor of a vehicle driving assistance system is arranged, • at least one optically transparent sensor window (2) of the composite pane (10) through which the beam path of the sensor (3) passes, and • a heating device (6), wherein the heating device (6) has at least one radiation source (7) in the infrared wavelength range and is arranged on the sensor holding device (5), wherein the radiation source (7) is arranged in a recess in the sensor holding device (5).

2. Composite pane arrangement (100) according to claim 1, wherein the heating device (6) comprises at least one radiation source (7) in the IR wavelength range from 0.8 pm to 3.5 pm.

3. Composite pane arrangement (100) according to claim 1 or 2, wherein the radiation source (7) comprises at least one IR LED.

4. Composite pane arrangement (100) according to one of claims 1 to 3, wherein the heating device comprises a radiation source (7) in the IR wavelength range from 1400 nm to 3000 nm, preferably from 1950 nm to 2950 nm.

5. Composite pane arrangement (100) according to one of claims 1 to 4, wherein the radiation source (7) is arranged such that radiation emitted by the radiation source (7) impinges perpendicularly on the second surface (IV) of the inner pane (2).

6. Composite pane arrangement (100) according to one of claims 1 to 5, wherein the heating device (6) has several, in particular two to 40, radiation sources.

7. Composite pane arrangement (100) according to one of claims 1 to 6, wherein the radiation source (7) is band-shaped or spot-shaped.

8. Composite pane arrangement (100) according to claim 6 or 7, wherein the sensor holding device (5) comprises a base part (5.1) which has means for fastening the sensor (8) and the radiation source (7).

9. Composite pane arrangement (100) according to claim 8, wherein the base part (8) comprises a flat surface extending from the sensor (8) in the direction of the second surface (IV) of the inner pane (2), on which surface the radiation source (7) is arranged.

10. Composite pane arrangement (100) according to one of claims 1 to 9, wherein a camera, a radar sensor or a LiDaR sensor system or a combination thereof is provided as the sensor (3).

11. Composite pane arrangement (100) according to one of claims 1 to 10, wherein the sensor holding device (5) is arranged in the central, upper region of the composite pane (10) when the composite pane (10) is installed as a windscreen of a vehicle.

12. Composite pane arrangement (100) according to one of claims 1 to 11, wherein the composite pane (10) is a front pane.

13. A method for controlling a heating device (6) in a vehicle by a heating system comprising a composite pane arrangement (100) according to one of claims 1 to 12, wherein the radiation source (7) is connected to at least one control unit and / or on-board electronics of the vehicle, the method comprising the following steps: - detecting moisture within the sensor window (4) on a surface of the outer pane (1) or the inner pane (2) by means of a moisture sensor connected to the control unit and / or on-board electronics, - Switching on the radiation source (7) in the event that moisture is detected within the sensor window by the moisture sensor, wherein the sensor holding device (5) comprises a base part (5.1) which has means for fastening the sensor (8) and the radiation source (7), and wherein the radiation source (7) is arranged in the base part (5.1) such that the radiation emitted by the radiation source (7) strikes the second surface (IV) of the inner pane (2) substantially perpendicularly, - Switch off the radiation source (7) when the moisture has been removed.

14. A computer-readable storage medium containing instructions that cause at least one processor to implement a method according to claim 13 when the instructions are executed by the at least one processor.

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