Motor vehicle window pane

Abstract

The invention relates to a motor vehicle window pane, comprising a pane (1; 5; 15; 20) and a heating region (2; 11; 19) which is arranged on or at the pane (1; 5; 15; 20), wherein the heating region (2; 11; 19) is designed to be heated with electrical energy from a voltage source of a motor vehicle, wherein the heating region (2; 11; 19) is designed to generate, using the electrical energy, a thermal loading of the pane (1; 5; 15; 20) that is strong enough that the pane (1; 5; 15; 20) cracks in or at the heating region (2; 11; 19).

Description

[0001] SAINT-GOBAIN SEKURIT FRANCE 2024389-WO-PCT

[0002] 1

[0003] Motor vehicle window pane

[0004] The present invention relates to a motor vehicle window pane according to the preamble of claim 1.

[0005] Electrically conductive coatings are known in the prior art for automotive window panes. These coatings are used to achieve desired climate control in the vehicle interior. For example, UV radiation and / or infrared radiation can be reflected. It is also possible to heat the coating by applying an electrical voltage to it, for example to melt ice or snow.

[0006] From DE 102 08 552 A1, a plate element is known comprising a prestressed glass pane provided with an electrically conductive, full-surface coating that can be heated by applying an electrical voltage via electrodes. A portion of the coating is electrically separated by a dividing line. At least one circumferential dividing line electrically separates an inner surface area of ​​the coating from an outer edge area of ​​the coating. The electrodes are arranged within the surface area defined by the dividing line.

[0007] KR 2012 0134165 A discloses a vehicle emergency exit device designed to create an escape route in case of danger by selectively shattering a vehicle window using thermal action. The described system is based on the principle of generating a significant temperature difference between the edge and center of the window by locally heating it with an electric heating wire. This heating wire is configured to run either directly on the glass surface, between the layers of a laminated glass pane, or embedded in the glass-guiding seal around the perimeter of the pane. Activating a switching unit induces rapid thermal expansion in the edge region, resulting in thermal stresses that exceed the glass's breaking strength and thus shatter the pane. SAINT-GOBAIN SEKURIT FRANCE 2024389-WO-PCT

[0008] 2

[0009] KR 102 660 435 B1 discloses a method for automatically breaking vehicle windows in emergency situations, wherein the system comprises an interior camera for monitoring the driver and at least one exterior camera for capturing the vehicle's surroundings. A central emergency decision module analyzes the generated video data using pre-trained neural networks to classify specific hazardous conditions, such as driver unconsciousness or external threats from fire and water, through frame-based evaluation. If such an emergency situation is verified, a control module selectively initiates the activation of glass breaker modules, which are technically designed as heating wires attached to the glass. These modules generate mechanical stresses, resulting in glass breakage, through targeted current application and the consequent thermal expansion.

[0010] JP H11 99895 A describes a device for assisting the evacuation of vehicle occupants, which aims to ensure the reliability of assistance in the event of a vehicle submerging. This device comprises a detection device that determines when the vehicle is submerged and a destructive device that shatters the vehicle window upon detection of submersion. The destructive device is primarily characterized by the fact that it uses a heating wire arranged in the window and a control device for supplying current to the heating wire for a predetermined period of time after detection of submersion. The destruction of the window is achieved by generating a large temperature difference, which is produced by the initial heating of the heating wire and the subsequent rapid cooling by air or water after the current supply is terminated.

[0011] CN 110 422 131 A discloses an emergency exit system for motor vehicles with a polycarbonate windshield, designed to allow laypersons to remove or break the windshield in emergency situations. The system comprises a heating element in contact with the polycarbonate windshield, forming a closed circuit with a control unit and connecting wires. The heating element and connecting wires have a melting point higher than that of the polycarbonate. In an emergency, a SAINT-GOBAIN SEKURIT FRANCE 2024389-WO-PCT signal is sent to the control unit.

[0012] 3

[0013] A signal is received from an accident detection unit, an emergency switch with a backup power supply, or via a remote data processor using mobile devices, whereupon the control unit energizes the heating element. The heating of the element melts the adjacent polycarbonate, making the pane easier to remove or break.

[0014] CN 109017662 A discloses a method for using an intelligent emergency exit device for buses in the event of a fire, which primarily serves to create an escape route for the occupants by thermally shattering the window glass. The device essentially comprises one or more heating wires embedded in the bus window panes and a control unit. The control unit is triggered by a smoke detector and / or a temperature sensor in the passenger compartment. Alternatively, the driver can manually activate an emergency release switch if the door cannot be opened. Upon activation, the heating wire is energized, causing it to heat up to a temperature above the bursting temperature of the window glass, thus shattering the pane.

[0015] CN 115092085 A discloses an emergency escape method for electric vehicles, specifically for the targeted destruction of laminated glass in the event of an accident, such as submersion. Technically, this is achieved by integrating an electric heating wire into the laminated glass interlayer. This wire is connected to the vehicle's high voltage and controlled by a manually activated emergency switch. When triggered by the occupant, the wire heats up to the melting point of the glass, causing the glass to melt and break locally along the wire's pattern, creating an escape opening. The heating wire is configured such that the different melting rates of the side sections, combined with the external water pressure, cause the glass to open inwards like a door, thus preventing injury from sharp edges.

[0016] In contrast, the present invention aims to reduce the risk to the health of motor vehicle occupants in the event of an accident. SAINT-GOBAIN SEKURIT FRANCE 2024389-WO-PCT

[0017] 4

[0018] This problem is solved by a motor vehicle window pane according to claim 1, a motor vehicle according to claim 11, and a method according to claim 14. Embodiments of the invention are specified in the dependent claims.

[0019] The motor vehicle window pane comprises a pane of glass and a heating element located on or adjacent to the pane. The heating element is designed to be heated by electrical energy from a motor vehicle's power source. Furthermore, the heating element is designed to generate such a high thermal load on the pane, using this electrical energy, that the pane shatters at or near the heating element. Thus, by supplying the heating element with electrical energy, the pane can be quickly and easily destroyed. This is particularly advantageous if the motor vehicle is damaged—for example, as a result of an accident. It is especially beneficial if, for instance, one or all of the vehicle's doors are damaged and can no longer be opened.It is also advantageous if the vehicle is on its roof and / or if a vehicle occupant is injured or unconscious and unable to exit the vehicle independently. The broken window allows the occupant to exit the vehicle, or enables rescuers to reach the occupant, assist them, and / or carry them out of the vehicle.

[0020] Since the voltage of the power supply is usually specified at 12 volts or 48 volts, the heating range can be specifically adapted to this voltage and to the glass. For example, a higher thermal load can be generated with a particularly stable glass than with a less stable glass.

[0021] The pane can be a glass pane, preferably made of soda-lime glass, as is common for window panes. However, the pane can also be made of other types of glass, for example, quartz glass, borosilicate glass, or aluminosilicate glass, or of rigid, clear plastics, for example, polycarbonate or polymethyl methacrylate. The thickness of the pane can preferably be from 0.5 mm to 5 mm, and particularly preferably from 1 mm to 3 mm. SAINT-GOBAIN SEKURIT FRANCE 2024389-WO-PCT

[0022] 5

[0023] The pane can be made of safety glass, preferably heat-treated safety glass. This can be particularly advantageous to avoid sharp-edged fragments if the pane breaks.

[0024] The disc has an electrically conductive coating that extends over more than two-thirds of its surface. In particular, the coating may cover the entire surface of the disc. For the purposes of this description, this means specifically that the coating covers the entire surface except for one or more textured areas incorporated into the surface. The heating zone is part of the coating. The heating zone is electrically insulated from adjacent areas of the coating by a textured area incorporated into the coating. It should be noted that the textured areas are not part of the coating. Therefore, the textured areas can be present on at most one-third of the surface. Preferably, the textured areas are lines that each have a width of less than 1 cm, preferably less than 0.5 cm, on the disc.In this embodiment, the heating area can be implemented particularly easily by incorporating it as part of the coating, which can also perform other functions. Compared to a disc known from the prior art, the heating area can be created simply by introducing the structuring.

[0025] This embodiment differs in particular from the disc known from JP H11 99895 A, in which only heating wires are provided to heat the disc. Such heating wires are not to be understood as a coating within the meaning of this application, since they cover too small a surface area of ​​the disc.

[0026] The coating can be emissivity-reducing. Emissivity-reducing coatings are also known as heat-radiation-reflecting coatings, low-emissivity coatings, or LowE (low emissivity) coatings. Emissivity is the measure that indicates how much heat radiation the pane, in its installed position, emits into an interior space compared to an ideal heat radiator (a black body). Emissivity-reducing coatings function to decrease the amount of heat radiation entering the interior space (infrared components of solar radiation and especially SAINT-GOBAIN SEKURIT FRANCE 2024389-WO-PCT).

[0027] 6. to reduce the thermal radiation of the pane itself) and also the radiation of heat from the interior. They exhibit reflective properties towards infrared radiation, especially towards thermal radiation in the spectral range of 5 pm - 50 pm (see also standard DIN EN 12898:2019-06). This effectively improves thermal comfort in the interior. At high outside temperatures and with solar radiation, the emissivity-reducing coatings can at least partially reflect the thermal radiation emitted by the entire pane towards the interior. At low outside temperatures, they can reflect the thermal radiation emitted from the interior, thus reducing the effect of the cold pane as a heat sink. The emissivity-reducing coating further increases thermal comfort in the interior. The emissivity-reducing coating is typically a transparent stack of thin films.The emissivity-reducing coating comprises at least one, preferably exactly one, electrically conductive layer, which provides infrared radiation reflective properties. The conductive layer is preferably based on a transparent conductive oxide (TCO), in particular indium tin oxide (ITO), alternatively indium zinc mixed oxide (IZO), gallium-doped tin oxide (GZO), fluorine-doped tin oxide (FTO, SnO₂:F), antimony-doped tin oxide (ATO, SnO₂:Sb), or niobium-doped titanium oxide (TiO₂:Nb). Unlike metals, TCOs are not susceptible to corrosion, so they can be used on the exposed inner surface of the inner disc.In addition to the conductive layer, the coating typically has dielectric layers (for example, based on silicon oxide or nitride), which serve in particular to optimize the optical properties (for example, light transmission) or to act as barrier layers to regulate oxygen diffusion during the deposition of the coating.

[0028] According to one embodiment of the invention, the structuring can have one or more curved sections. For example, the structuring can comprise several lines that are not directly connected to one another. For example, the lines can be spaced at different distances from each other along their course. In particular, it is possible for the sections of the structuring to have curves with different radii of curvature and / or different directions of curvature. The lines can, in particular, be wavy. SAINT-GOBAIN SEKURIT FRANCE 2024389-WO-PCT

[0029] 7

[0030] According to one embodiment of the invention, the automotive window pane can include a busbar through which the heating area and the adjacent areas are electrically connected to a common ground potential. The busbar can, for example, also be referred to as a common ground. Using the busbar to connect both the heating area and the adjacent areas to the common ground potential is advantageous for reducing production costs.

[0031] According to one embodiment of the invention, the heating element can be configured to generate the thermal load with a voltage of less than 100 volts, preferably less than 50 volts. This is advantageous in order to be able to use the vehicle window pane with a voltage source from a conventional vehicle according to the invention.

[0032] According to one embodiment of the invention, the heating area can cover an area of ​​the disc of less than 20 cm². 2 , preferably less than 10 cm 2 , cover. Such a small area is particularly advantageous in order to generate the desired thermal load using the energy from the vehicle's power source.

[0033] According to one embodiment of the invention, the pane can be designed as a composite pane with a first pane element, a second pane element, and a bonding agent. The bonding agent can, for example, be based on polyvinyl butyral (PVB), ethylene-vinyl acetate (EVA), or polyurethane (PU), or on mixtures, copolymers, or derivatives thereof, particularly preferably on PVB. This means that the bonding agent can contain the polymer to a large extent (proportion greater than 50% by weight). In addition to the polymer, the bonding agent can contain other additives, such as plasticizers, UV absorbers, or stabilizers. The thickness of the bonding agent is preferably from 0.2 mm to 2 mm. For example, the bonding agent can comprise one or more PVB films with standard thicknesses of 0.38 mm or 0.76 mm. SAINT-GOBAIN SEKURIT FRANCE 2024389-WO-PCT

[0034] 8

[0035] The first and second pane elements are preferably glass panes, particularly preferably made of soda-lime glass, as is common for window panes. However, one or both pane elements can also be made of other types of glass, such as quartz glass, borosilicate glass, or aluminosilicate glass, or of rigid, clear plastics, such as polycarbonate or polymethyl methacrylate. The thicknesses of the pane elements are preferably from 0.5 mm to 5 mm, and particularly preferably from 1 mm to 3 mm, and are independent of each other.

[0036] It is particularly advantageous if the first and second pane elements are each made of thermally tempered single-pane safety glass (ESG). With such pane elements, the risk of cuts after shattering would be especially low. In this case, the pane can be laminated and comprise both the first and second pane elements.

[0037] The first and second disc elements can be connected to each other via the connecting element. The heating element can be located in or on the first disc element. The first disc element can be designed to destroy the second disc element if it breaks due to thermal stress. This can be achieved, in particular, by utilizing the kinematic energy generated during the breakage to destroy the second disc element.

[0038] It is also possible that the disc is designed as a composite disc with a first disc element, a second disc element and a connecting means, wherein a heating area is arranged in or on the first disc element and in or on the second disc element.

[0039] If the pane is designed as a laminated pane, the heating element can be arranged, in particular as a conductor, on an outer surface of the first pane element facing away from the interior. In this case, the first pane element can be, in particular, an inner pane element. This can mean that the first pane element is closer to the interior of the motor vehicle than the SAINT-GOBAIN SEKURIT FRANCE 2024389-WO-PCT

[0040] 9. Second pane element, if the motor vehicle window pane is installed in a motor vehicle as intended.

[0041] If the pane is designed as a laminated pane, the heating element can, in particular, be part of a coating applied to the first pane element. If the first pane element is an inner pane element located closer to the interior of the vehicle than the second pane element, the coating can be applied to an outer surface of the first pane element facing away from the interior. If the first pane element is an outer pane element located farther from the interior of the vehicle than the second pane element, the coating can be applied to a side of the first pane element facing the interior.

[0042] It is also possible that the motor vehicle window pane includes a pane holder on or in which the heating element is located.

[0043] According to one embodiment of the invention, the motor vehicle window pane can include a pane holder. The pane can be arranged in the pane holder. The pane holder can hold the pane. The pane holder can be designed to move together with the pane. This can particularly include or signify movement in a vertical direction. In this case, the heating element can be arranged on a base of the pane holder. The pane can rest on this base.

[0044] According to one embodiment of the invention, the motor vehicle window pane can include a pane holder. The pane holder can be arranged at least partially within the pane. The pane holder can be designed to move together with the pane. The heating element can be arranged on the pane holder.

[0045] According to one embodiment of the invention, the heating area can be in thermal contact with the disc via a thermal conductor. SAINT-GOBAIN SEKURIT FRANCE 2024389-WO-PCT

[0046] 10

[0047] According to one embodiment of the invention, the disc can be destroyed by supplying the heating area with electrical energy. This can mean, in particular, that the disc shatters due to the intense heating of the heating area. This differs significantly from the destruction of the disc due to cooling after it has been heated. In order to destroy the disc by heating, it may be necessary to heat the heating area with a sufficiently high electrical power so that the heating occurs quickly enough to shatter the disc. This differs from the destruction of the disc by subsequent cooling by air or water.

[0048] The motor vehicle according to claim 11 comprises a motor vehicle window pane according to an embodiment of the invention as a side window pane and / or rear window pane.

[0049] According to one embodiment of the invention, the motor vehicle can comprise a battery, a detection unit, and a triggering unit. The detection unit can be configured to detect damage to the motor vehicle. For example, the detection unit can be configured to detect damage to a door or a tailgate. Alternatively or additionally, the detection unit can be configured to detect whether the motor vehicle is lying on its roof. In this case, damage to the motor vehicle is equated with the fact that the motor vehicle is lying on its roof. It is also possible for the detection unit to be configured to detect an accident involving the motor vehicle. In this case, the detection of the accident is equated with the detection of the damage. For example, the detection unit can also be used to trigger the motor vehicle's airbags.In this case, the damage can be detected when the airbags are deployed. The detection unit can be configured to send a signal to the triggering unit if the damage is detected. Upon receiving this signal, the triggering unit can be configured to initiate heating of the heating element using the battery as the voltage source. SAINT-GOBAIN SEKURIT FRANCE 2024389-WO-PCT.

[0050] 11

[0051] In such a vehicle, the window is automatically broken, allowing occupants to exit the interior and emergency personnel to enter. This is particularly advantageous so that vehicle occupants, especially those who are unconscious and / or injured, can receive prompt assistance.

[0052] According to one embodiment of the invention, the heating element is not visible from either outside or inside the vehicle when the side window is closed. This can be achieved, for example, by arranging the heating element below a seal that rests against the window when the side window is closed. For the purposes of this description, "closed" refers specifically to the window being closed.

[0053] The method according to claim 14 comprises the detection of damage to the motor vehicle, in particular to an area of ​​the motor vehicle in which the motor vehicle window pane is located. This area may, for example, be a door or a tailgate of the motor vehicle. The detection may, in particular, be carried out using the detection unit as described above with reference to the motor vehicle.

[0054] If damage is detected, the heating element is supplied with electrical energy from the vehicle's electrical source, causing the windshield to shatter due to the thermal stress generated by the heating element. Damage detection thus triggers the supply of electrical energy to the heating element. It is possible for the windshield to shatter due to the intense heating of the heating element. This differs significantly from windshield shattering caused by cooling after heating. To shatter the windshield through heating, it may be necessary to heat the heating element with a sufficiently high electrical power so that the heating occurs quickly enough to shatter the windshield. This differs from windshield shattering caused by subsequent cooling by air or water. SAINT-GOBAIN SEKURIT FRANCE 2024389-WO-PCT

[0055] 12

[0056] Further features and advantages of the present invention will become clear with reference to the following description of preferred embodiments and the accompanying figures. The same reference numerals are used for identical or similar components, features, or elements, and for components, features, or elements with identical or similar functions.

[0057] Fig. 1 shows a schematic top view of a motor vehicle window pane with a printed heating area;

[0058] Fig. 2 is a schematic top view of a motor vehicle window pane according to an embodiment of the invention with a heating area as part of a coating of the pane;

[0059] Fig. 3 shows a schematic detail view of a heating area as part of a coating on a disc;

[0060] Fig. 4 shows a schematic sectional view of a motor vehicle window pane according to an embodiment of the invention with a pane holder projecting into a cavity of a pane and a heating area arranged on the pane holder; and

[0061] Fig. 5 shows a schematic sectional view of a motor vehicle window pane with a pane standing on a base of a pane holder and a heating area arranged on the base.

[0062] The vehicle windshield shown in Figure 1 comprises a pane 1, the lower portion of which, below a line 4, is not visible when the pane 1 is closed and installed in a vehicle. In this state, a seal of the vehicle rests against line 4.

[0063] In the lower section, a heating zone 2 in the form of an electrical conductor is printed on the disc 1. Heating zone 2 can be connected to an electrical power source of the motor vehicle via electrical contacts 3. When the motor vehicle disc is used in a motor vehicle, a detection unit of the SAINT-GOBAIN SEKURIT FRANCE 2024389-WO-PCT

[0064] 13

[0065] The system detects whether the vehicle is damaged. If damage to the vehicle—for example, to a door—is detected, the heating element 2 is connected to the vehicle's electrical power source, causing it to heat up. Preferably, the voltage applied to the heating element 2 is less than 50 volts. A voltage of 12 volts or 48 volts is particularly preferred. Due to the resistance of the heating element 2, it heats up so intensely that the resulting thermal stress in the pane 1 becomes so great that the pane 1 shatters. Preferably, the pane 1 is made of safety glass so that no sharp shards are produced.

[0066] The intended shattering of pane 1 upon damage to the vehicle is advantageous to allow the vehicle's occupants to exit the vehicle. This may be particularly necessary in the event of a vehicle fire. The automatic shattering of pane 1 is especially beneficial in this case to facilitate a rapid escape from the vehicle. Shattering pane 1 is also advantageous to allow rescuers to assist unconscious and / or injured occupants and / or carry them out of the vehicle. Particularly if pane 1 is made of safety glass, shattering it without a suitable tool can be very difficult or even impossible.

[0067] The disk 5 shown in Figure 2 is fully coated with an electrically conductive layer 6. Structures 8 in the form of dividing lines are incorporated into the layer 6, electrically isolating the individual areas of the layer 6 from one another. These structures 8 may have been created, for example, using a laser. A busbar 7 runs along a first outer lateral edge of the disk 5, electrically connecting the layer 6 to a ground potential. A second busbar 9 runs along a second outer lateral edge of the disk 5, opposite the first outer lateral edge, connecting the layer 6 to an electrical potential that differs from ground potential. The busbars 7 and 9 can thus be used to apply a voltage to the layer 6. When a voltage is applied, the layer 6 heats up, causing, for example, ice or snow to melt.Furthermore, the coating 6 can be designed to absorb UV and / or infrared radiation. SAINT-GOBAIN SEKURIT FRANCE 2024389-WO-PCT.

[0068] 14

[0069] to reflect radiation, thus achieving particularly good thermal insulation.

[0070] It should be noted that preferably the circumferential outer edge of the disc 5 can be free of the coating in order to reduce the risk of corrosion or to prevent corrosion. This can, for example, be a section with an extent between 2 and 8 millimeters, preferably between 4.5 and 5.5 millimeters.

[0071] The disk 5 may also have a black print that conceals the busbars 7 and 9. This may be desirable for optical reasons. The black print may be arranged on an inward-facing surface of an outer disk element of the disk 5. The coating 6 may preferably be arranged on an outward-facing surface of an inner disk element of the disk 5.

[0072] The collector conductors 7 and 9 may be concealed by lateral guides of the disc 5 when viewed from inside the vehicle. This may also be desirable for aesthetic reasons.

[0073] The busbar 7 is also used to electrically connect the heating zone 11. The heating zone 11 is located between two structured areas. The heating zone 11 is part of the coating 6 and is electrically insulated from adjacent areas of the coating 6 by the structured areas. As can be seen in Figure 2, the heating zone 11 is also located below line 4, so that it is not visible when the window 5 is closed. Furthermore, the heating zone 11 is electrically connected via another electrical connection 10. In the event of damage to the vehicle, for example, damage to a door, a voltage is applied to the heating zone 11 via the busbar 7 and the connection 10, causing the window 5 to be subjected to such a high thermal stress that it shatters. The advantages of this embodiment are therefore similar to those of the embodiment shown in Figure 1.The embodiment shown in Figure 2 can be manufactured particularly efficiently when the disc 5 is to be used with the coating 6. SAINT-GOBAIN SEKURIT FRANCE 2024389-WO-PCT.

[0074] 15

[0075] The heating area shown as an example in Figure 3 can also be used for the disk 5 from Figure 2 instead of the heating area 11. Two wavy lines 12 and 13 are used as a structural element, defining the heating area and electrically isolating it from adjacent areas of the coating. The wavy lines 12 and 13 each have sections with different radii of curvature and different directions of curvature. Furthermore, the distance between the wavy lines 12 and 13 varies along their length. Due to the waveform, a particularly high electrical resistance of the heating area is achieved. Additionally, the current density increases in the areas 14 of the heating area, resulting in a particularly high thermal stress on the disk 5, causing it to shatter when voltage is applied via the busbar 7 and the electrical connection 10.

[0076] The disc 15 shown in Figure 4 has a cavity in which a disc holder 16 is arranged. The disc holder 16 is used to move the disc 15 up and down when installed in the vehicle. A heating element 19 is arranged on the disc holder 16 and is electrically connected to a power source of the vehicle via electrical contacts 18. When damage to the vehicle is detected, the heating element 19 is heated by applying an electrical voltage. The heat is transferred to the disc 15 via a thermal conductor 17, causing it to shatter due to the resulting thermal stress.

[0077] The disc 20 shown in Figure 5 is arranged in a disc holder 22 and rests on a base of the disc holder 22. On the base, the heating element 19 is arranged in the form of an electrical conductor, which is electrically connected to a power source via electrical contacts 18. The heating element 19 is in thermal contact with the disc 20 via a thermal conductor 17. If the vehicle is damaged, particularly a door, the heating element 19 is heated by applying an electrical voltage to it via the electrical contacts 18. The resulting heat is conducted to the disc 20 via the thermal conductor 17, causing it to shatter due to the thermal stress. SAINT-GOBAIN SEKURIT FRANCE 2024389-WO-PCT

[0078] 16

[0079] Similar to the other embodiments shown in Figures 1 to 4, the heating area 19 is not visible when the disc 20 is closed, as it is arranged below a line along which the seals 21 rest against the disc 20.

[0080] SAINT-GOBAIN SEKURIT FRANCE 2024389-WO-PCT

[0081] 17

[0082] Reference symbol list

[0083] 1 slice

[0084] 2 heating zones

[0085] 3 electrical contacts

[0086] 4 line

[0087] 5 slices

[0088] 6 coating

[0089] 7 collection conductors

[0090] 8 Structuring

[0091] 9 collection ladders

[0092] 10 electrical connection

[0093] 11 Heating area

[0094] 12 wavy lines

[0095] 13 wavy lines

[0096] 14 area

[0097] 15 slices

[0098] 16 disc holders

[0099] 17 Thermal conductors

[0100] 18 electrical contact

[0101] 19 Heating area

[0102] 20 slices

[0103] 21 Seal

[0104] 22 Disc holder

Claims

SAINT-GOBAIN SEKURIT FRANCE 2024389-WO-PCT 18 Patent claims 1. Motor vehicle window pane comprising a pane (1; 5; 15; 20) and a heating area (2; 11; 19) arranged on or at the pane (1; 5; 15; 20), wherein the heating area (2; 11; 19) is configured to be heated by electrical energy from a voltage source of a motor vehicle, wherein the heating area (2; 11; 19) is configured to generate, using the electrical energy, such a high thermal load on the pane (1; 5; 15; 20) that the pane (1; 5; 15; 20) shatters in or at the heating area (2; 11; 19), characterized in that the pane (1; 5; 15; 20) has an electrically conductive coating (6) extending over more than two-thirds of a surface of the pane (1; 5; 15; 20) extends, wherein the heating area (2; 11 ; 19) is part of the coating (6), wherein the heating area (2; 11 ;19) is electrically insulated from adjacent areas of the coating (6) by a structuring (8) introduced into the coating (6).

2. Motor vehicle window pane according to the previous claim, characterized in that the structuring (8) has one or more sections with curvature.

3. Motor vehicle window pane according to one of the two preceding claims, characterized in that the motor vehicle window pane comprises a common conductor (7) via which the heating area (2; 11; 19) and the adjacent areas are electrically connected to an electrical ground potential.

4. Motor vehicle window pane according to one of the preceding claims, characterized in that the heating area (2; 11; 19) is designed to generate the thermal load with a voltage of less than 100 volts, preferably less than 50 volts. SAINT-GOBAIN SEKURIT FRANCE 2024389-WO-PCT 19 5. Motor vehicle window pane according to one of the preceding claims, characterized in that the heating area (2; 11; 19) covers an area of ​​the pane (1; 5; 15; 20) of less than 20 cm² 2 , preferably less than 10 cm 2 , covered.

6. Motor vehicle window pane according to one of the preceding claims, characterized in that the pane (1 ; 5; 15; 20) is designed as a composite pane with a first pane element, a second pane element and a connecting means, wherein the first pane element and the second pane element are connected to each other via the connecting means, wherein the heating area (2; 11 ; 19) is arranged in or on the first pane element, and wherein the first pane element is designed to destroy the second pane element if the first pane element is destroyed due to thermal stress.

7. Motor vehicle window pane according to one of the preceding claims, characterized in that the motor vehicle window pane comprises a pane holder (22), wherein the pane (1 ; 5; 15; 20) is arranged in the pane holder (22), wherein the pane holder (22) holds the pane (1 ; 5; 15; 20), wherein the pane holder (22) is designed to be moved together with the pane (1 ; 5; 15; 20), wherein the heating area (2; 11 ; 19) is arranged on a base surface of the pane holder (22), wherein the pane (1 ; 5; 15; 20) rests on the base surface.

8. Motor vehicle window pane according to one of claims 1 to 7, characterized in that the motor vehicle window pane comprises a pane holder (16), wherein the pane holder (16) is arranged at least partially within the pane (1 ; 5; 15; 20), wherein the pane holder (16) is designed to be moved together with the pane (1 ; 5; 15; 20), wherein the heating area (2; 11 ; 19) is arranged on the pane holder (16).

9. Motor vehicle window pane according to one of the two preceding claims, characterized in that the heating area (2; 11; 19) is in thermal contact with the pane (1; 5; 15; 20) via a thermal conducting medium (17). SAINT-GOBAIN SEKURIT FRANCE 2024389-WO-PCT 20 10. Motor vehicle window pane according to one of the preceding claims, characterized in that the pane can be destroyed by supplying the heating area with electrical energy.

11. Motor vehicle comprising a motor vehicle window pane according to one of the preceding claims as a side window pane and / or rear window pane.

12. Motor vehicle according to the previous claim, characterized in that the motor vehicle comprises a battery, a detection unit and a triggering unit, wherein the detection unit is configured to detect damage to the motor vehicle, wherein the detection unit is configured to output a signal to the triggering unit if the damage has been detected, wherein the triggering unit is configured to trigger heating of the heating area (2; 11; 19) using the battery as a voltage source for heating in response to receiving the signal.

13. Motor vehicle according to one of the two preceding claims, characterized in that the heating area (2; 11; 19) is not visible from outside the motor vehicle or from inside the motor vehicle when the side window pane is closed.

14. Method for destroying a motor vehicle window pane according to one of claims 1 to 10 in a motor vehicle according to one of claims 11 to 13, comprising the following steps: Detection of damage to the motor vehicle, in particular to an area of ​​the motor vehicle where the motor vehicle window pane is located; Supply of electrical energy to the heating area (2; 11; 19) if damage is detected, so that the disc shatters due to the thermal stress generated by the heating area.

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