DE102019109740A1 - Vehicle window device and method for operating a vehicle window device - Google Patents

Abstract

The vehicle window device comprises a flat pane (2a) which has a transparent surface (11, 12) along its flat extension, a protective layer (2c) arranged along the transparent surface (11) of the pane (2a) and at least one between the transparent surface (11) the decoupling element (3a, 15) arranged on the pane (2a) and the protective layer (2c). It also comprises a light source (4, 5, 6) for emitting a light emission, the light emission being able to be coupled into the pane (2a) in such a way that a light distribution can be coupled out through the coupling-out element (3a, 15). In the method for operating a vehicle window device, the light emission is coupled into the pane (2a) in such a way that a light distribution is coupled out through the coupling-out element (3a, 15).

Description

The present invention relates to a vehicle window device and a method for operating a vehicle window device.

When designing modern vehicles, especially motor vehicles, only relatively small areas are often provided for light and lighting functions. Current developments in lighting technology make it possible to design the lights required to operate the vehicles very freely and to integrate them into the appearance in a way that was previously unknown. At the same time, it is of central importance for safe driving that light signals can continue to be output in a clearly visible manner for other road users.

In addition, various exterior surfaces of vehicles are routinely used to give them a desired appearance, for example in the sense of a brand identity or individualization for individual customers or customer groups, or to provide information and advertising space.

The US 7,791,785 B2 describes a motor vehicle window on which a controllable display can be generated. A controllable medium for the display is integrated into a pane, for example capsules with electronic ink, LCD pixels or OLED.

The DE 10 2017 216 657 A1 describes a window pane device for a window of a motor vehicle, light coupled into the pane on a narrow side being guided and decoupled from the pane with decoupling elements. This makes it possible to illuminate the interior of the vehicle, while at the same time it is less visible from the outside.

The present invention is based on the object of providing a vehicle window device and a method for operating a vehicle window device which enable a particularly simple and space-saving design.

According to the invention, this object is achieved by a vehicle window device with the features of claim 1 and a method for operating a vehicle window device with the features of claim 10. Advantageous refinements and developments result from the dependent claims.

The vehicle window pane device according to the invention comprises a flat pane, which has a transparent surface along its flat extension, and a protective layer arranged along the transparent surface of the pane. It also has at least one decoupling element arranged between the transparent surface of the pane and the protective layer and a light source for emitting a light emission. The light emission can be coupled into the pane in such a way that a light distribution can be coupled out through the coupling-out element.

As a result, the light distribution can advantageously be generated in a particularly simple manner, with particularly little installation space being required. The coupling-out element is particularly well protected by the protective layer.

In particular, the light distribution can illuminate the area around the vehicle. Furthermore, the light distribution can be advantageous from a safety point of view if, for example, dark areas around the vehicle are illuminated and are therefore better visible to a user. The vehicle with the vehicle window device can also be more visible to other road users.

The light distribution can be generated as static or dynamic lighting. In this way, the vehicle can be individualized, which in particular allows the individual vehicle to be better recognized by a user and improves the loyalty of the user to a specific brand.

The pane is designed in particular as a vehicle window pane. In the context of the invention, a vehicle window pane denotes a pane for a window of a vehicle which is arranged in such a way that a view from the passenger compartment of the vehicle to the outside or vice versa is possible through it.

In one embodiment, the pane is formed using toughened safety glass (ESG) or laminated safety glass (VSG). The pane can furthermore comprise a composite of several glass panes and / or at least one glass pane and further layers, for example foils, coatings and / or adhesive layers.

The surfaces of the pane through which it is possible to see through are referred to below as "transparent surfaces". The pane can have measures that prevent it from being seen through, for example by means of a dark film; nevertheless, these areas are also referred to below as see-through areas, since a view through would be possible without the additional measures. The disc also has other sides that hereinafter referred to as “narrow sides” or “edges” of the pane and which extend essentially in one direction of the thickness of the pane. The narrow sides in particular have an area of at most one tenth, preferably at most one hundredth of the area of the transparent areas. A narrow side of the pane can in particular run perpendicular to a see-through surface or connect at right angles to an adjacent region of a see-through surface.

When light is “coupled in” within the meaning of the invention, the light enters the vehicle window pane in such a way that it is guided inside by total reflection. Total reflection occurs when light, emanating from an optically denser medium, such as the vehicle window pane, hits a boundary surface with an optically thinner medium, such as air in the vicinity of the vehicle window pane, and when the angle of incidence of the light relative to the boundary surface exceeds a critical angle . Total reflection therefore occurs in particular when the coupled-in light hits a transparent surface at a suitable angle above the critical angle from the interior of the vehicle window pane. In particular, the coupling takes place on a narrow side of the disk. Coupling in the sense of the invention is in contrast to the passage of light through the pane, in which light strikes one of the transparent surfaces, passes through the pane and emerges again at the opposite transparent surface. At most, scattering effects result in a slight coupling and conduction in the vehicle window pane, or a change in the direction of propagation through calculation.

In the following, the “direction of propagation” of light in the pane is in particular an optical axis along which the light is propagated. The light does not necessarily have to follow a distribution symmetrical about the optical axis, but the optical axis can, for example, correspond to a course of a center of gravity line of an intensity distribution of the light. For example, the light can be emitted by a light source and coupled into the pane in such a way that the light distribution is fanned out, the light distribution having a cross-section that increases in the direction of propagation; the direction of propagation then corresponds to a mean direction in which the coupled-in light propagates. The direction of propagation runs in particular parallel to the transparent surfaces of the pane, the flat angles required for total reflection relative to the transparent surfaces not being taken into account.

The coupling-out of the light by the coupling-out element takes place in a manner known per se. For this purpose, the coupling-out element is arranged on a transparent surface of the pane in such a way that light that strikes the coupling-out area from the inside of the pane no longer meets the requirements for total reflection, in particular because the angle of incidence is smaller than the critical angle of total reflection. The incident light is then not reflected, but at least partially emerges from the pane, which functions as a light guide.

With a suitable design of the coupling-out element, a light distribution with a specific shape can be output. For example, surfaces can be shaped in such a way that certain information is output as a signal through this shape. Furthermore, a pattern can be formed or a graphic representation can be output, such as a logo or an advertising representation. By outputting such a light distribution, a special brand loyalty and a recognition effect can advantageously be achieved, which enables a user to identify the vehicle particularly easily.

In one embodiment of the vehicle window device according to the invention, the protective layer is formed from aluminosilicate glass and has a thickness of 0.3 to 0.6 mm, preferably 0.4 mm, for example. This advantageously enables particularly good protection of the coupling-out element by the protective layer.

The protective layer is arranged in particular over the coupling-out element. If the coupling-out element is arranged on the outside of the pane, it is arranged on the side facing away from the interior of the vehicle window pane in such a way that it covers the coupling-out element. It can also be arranged “along” one of the transparent surfaces of the pane, in which case the surface area of the pane essentially corresponds to the surface area of the protective layer. The protective layer can be arranged adjacent to the pane, optionally separated therefrom by the coupling-out element.

The protective layer comprises, for example, a protective film or a glass layer, for example a cover glass such as “Gorilla Glass®” (Corning) or a comparable glass. The protective layer can prevent the deposition of dirt in structured areas of the coupling-out element and / or avoid mechanical stress. For example, side windows of a vehicle can typically be sunk into a shaft in the door and are guided along a rubber lip in the process. With other windows, a wiper can exert mechanical stress on the structures.

The protective layer can alternatively or additionally be formed from further materials, for example to influence the surface properties.

The coupling-out element can be designed in different ways known per se and in particular has a surface structure that is suitable for coupling-out.

In a further embodiment, the coupling-out element comprises a film with prismatic structures. In further configurations, alternatively or additionally differently formed coupling-out structures can be provided in the film. The decoupling can thereby advantageously take place particularly simply and the decoupled light distribution can be precisely controlled. In particular, the coupling-out structures are not formed in a surface of the pane itself, in particular not in one of the transparent surfaces. This advantageously avoids a weakening of the pane, which can be under tension, for example.

The film can be formed from polycarbonate (PC) or another material. The transmittance of the film is in particular more than 90%, it being possible in further embodiments of the invention, for example, to provide a colored film that functions as a filter for the light that is coupled out.

In the area of the outcoupling structures, in particular in the case of prismatic structures, surface areas are formed, for example, which have a local extent in one plane and which are discontinuous, that is to say with an edge, adjoin further surface areas whose local extent extends in another plane.

The film can have prism structures and / or other regular or irregular coupling-out structures on a surface that faces or faces away from the transparent surface. Such structures can be obtained in a manner known per se.

The film can for example be applied to the transparent surface and in particular glued on. Films, in which, for example, prismatic structures are formed, can be applied particularly easily and are particularly advantageous wherever panes are mechanically stressed, for example in a vehicle window pane that is mounted under tension, in which structures formed directly in the glass surface, for example by engraving or etching , could lead to a local weakening.

The pane of the vehicle window device comprises, for example, a prism film.

The film with the coupling-out structures can be glued, for example by means of an adhesive layer, for example a transfer adhesive film, to the transparent surface of the window facing the vehicle exterior. The protective layer can then be glued on over the film with the coupling-out structures, that is to say likewise on the side facing the outside space. The protective layer can also be glued to the surface of the film by means of an adhesive layer, in particular a transfer adhesive film.

The coupling-out structures can be formed, for example, on the side of the coupling-out element facing the pane and / or on the side of the coupling-out element facing the protective layer, in particular in a film. The coupling-out structures are in particular designed such that the surface between media of different optical density does not run parallel to the transparent surface of the pane, but at an angle to it, approximately 45 °. For example, prism structures can have an angle of 90 ° to one another.

Between the film and the protective layer, in the area of the coupling-out structures, there are in particular cavities which are filled with a medium that is optically thinner than the pane and / or the film, in particular air. In these areas, light coupled into the pane or into the layered composite of pane and film strikes an interface between the optically denser medium of the film and the optically thinner medium, such as air. From the cavity in the area of the coupling-out structures, the light enters the protective layer through a further surface and from this in turn reaches the air in the outside space. In further exemplary embodiments, instead of air, another medium can be used which fills the depressions formed in the area of the coupling-out structures and influences the coupling-out properties, above all through its optical density.

In particular, the coupling-out element, for example a film with the coupling-out element, is applied in planar contact to one of the transparent surfaces of the pane. The contact can be mediated by an adhesive layer. In particular, no gap, in particular no air-filled gap, is formed between the disk and the coupling-out element. In this case, air is only enclosed in the cavities which are formed by the coupling-out structures of the film and the protective layer. Furthermore, the protective layer can also be in flat contact with the coupling-out element or the film the coupling-out element, wherein an adhesive layer can also be provided here to establish the contact. The planar contact between the protective layer and the coupling-out element is formed in such a way that cavities are formed in the area of a coupling-out structure of the coupling-out element, the cavities here with an optically thinner medium, in particular air; are filled. The protective layer can be in contact with edges that are formed in an area with outcoupling structures by adjacent surface areas. In particular, the protective layer is applied in such a way that the cavities are not filled by an adhesive or other substances.

Alternatively or additionally, other decoupling elements can be provided, for example controllable decoupling elements, for example organic light emitting diodes (OLED), the structure of which can be changed by applying a voltage so that an output is controlled in one area. In this case, passively illuminated decoupling elements are thus formed in the area of the controllable decoupling elements, for example by means of suitable OLED elements. In particular, the permeability of the structure of an OLED element changes, with light being able to be coupled out of the pane in a certain state, while the area is opaque or not suitable for coupling out in another state.

In particular, the transmittance for the composite layers of the vehicle window device is at least 70%, that is to say at least 70% of the intensity of the light incident on the vehicle window in the visible range is transmitted. In particular, the coupling-out element has a transmittance of at least 70%.

In a further development, the light source comprises a multiplicity of lighting elements which are arranged along a narrow side of the pane. In this way, particularly flexible and homogeneous light distributions can advantageously be generated.

The light-emitting elements are formed in a manner known per se, for example as light-emitting diodes (LED) or SMD chips. The light-emitting elements can emit light of a certain intensity and / or color, with light-emitting elements with an adjustable color, in particular RGB-LED, also being able to be used. The light emitted by a luminous element can also be emitted in a specific distribution, for example a distribution of the light intensity being formed such that light is emitted into the room with a specific opening angle, the intensity distribution being essentially homogeneous within the opening angle.

LEDs allow a particularly compact design that is adapted to the space available. The lighting geometry of the emitted light can be selected according to the pane geometry. In particular, the light elements can be arranged on a lower edge of the pane in order to couple the emitted light into the pane from below. The light sources are installed in a particularly discreet way, without interfering with the vehicle design and taking up additional space. The lighting elements are designed in such a way that, if necessary, the height of the window can be adjusted, for example in the case of adjustable side windows of a vehicle. In particular, the weight of the light source of the decoupling element is matched to other elements of the vehicle, for example in order to be able to use a window lifter.

The LEDs used can also be supplied with electrical energy by an on-board network of the vehicle, in particular 12 V direct voltage. The light distribution is generated in such a way that an illuminance of at least 100 Ix can be achieved. The LEDs can also be selected so that light with a certain color temperature is emitted, for example neutral white light.

By suitably controlling the light elements, dynamic, time-varying light distributions can also be formed, for example light of a time-varying intensity and / or color, with flashing or with control of a large number of light elements arranged next to one another, which are activated and deactivated one after the other, so that a running light effect is produced.

In one embodiment, various light emissions are coupled into the pane in such a way that the directions of propagation of the light run obliquely to one another. In particular, light with different directions of propagation is coupled in for different light functions.

This means that the directions of propagation are not parallel to one another. In particular, this also excludes the case in which the directions of propagation for different light functions run exactly opposite one another. The directions of propagation run in particular in the plane of the vehicle window pane, in particular parallel to at least one transparent surface.

In one embodiment of the method according to the invention, the run Directions of propagation perpendicular to each other. In this way, for example, two light functions can be clearly separated from one another.

In a further embodiment, the light for a first and second light function is coupled in on a first and a second narrow side of the pane, the first and second narrow side running at an angle to one another. In particular, the narrow sides at the point where the light is coupled in for the first or second light function are at an angle of at least 45 °, preferably at least 80 °, more preferably exactly 90 ° to one another. As a result, directions of propagation of the light in the pane that run obliquely to one another are advantageously achieved in a particularly simple manner.

In particular, the disk has a shape that defines edges that run at an angle to one another, the light being coupled in on different narrow sides. In particular, the disk has a substantially rectangular or trapezoidal shape.

In the case of a multiplicity of light-emitting elements, a resulting light distribution of the light coupled into the pane can also be determined and the light-emitting elements can be controlled in such a way that a homogeneous intensity distribution is achieved within the coupling-out area. For example, due to the arrangement of the luminous elements and the type of their light emission as well as the coupling into the pane, parts of the coupling-out area can be illuminated by a different number of luminous elements. In this case, the intensity of the individual light-emitting elements can therefore be made weaker than in the case of light-emitting elements, of which a smaller number illuminates an area of the coupling-out area.

In a further development, the light decoupled by the decoupling element is decoupled in a luminous area. The luminous area has a width extension perpendicular to the direction of propagation of the light within the pane. The width extension is formed as a function of a control signal. As a result, the lighting area can advantageously be designed to be particularly flexible, for example in order to distinguish between different light functions or to be able to output different information by means of the light functions. The control signal can be formed, for example, as a function of a parameter that is detected by means of a detection unit.

The width extension is understood in particular to mean that it also describes the entire width of a light distribution in which no contiguous luminous area is formed. That is, if several partial areas with separate surface areas of the luminous area are formed in a decoupling area of the decoupling element, then the width of the lighting area can be defined as the entire width of the area within which light is decoupled for the respective light function.

Furthermore, the luminous area can have a longitudinal extent which runs parallel to the direction of propagation of the coupled-in light in the pane. In particular, the longitudinal extension is formed in such a way that the luminous area extends in the direction of propagation and with a certain width extension over the entire decoupling element.

In a further embodiment, the coupling-out element has a fluorescent surface through which the light distribution can be generated by means of light, in particular UV light, coupled into the pane. The fluorescent surface emits light in the visible range of the spectrum when it is excited by means of a stimulating light emission, in particular light in the UV range of the spectrum. The light source can be designed, for example, as a UV LED, the light of which is coupled into the pane and strikes a fluorescent layer, for example a fluorescent lacquer, at the coupling element.

In one embodiment, the decoupling element is formed such that at least 80% of the decoupled light distribution is directed into an outside space of the vehicle. The light distribution is thereby advantageously emitted to the outside in a particularly efficient manner. In particular, it can thereby be achieved that the vehicle interior can hardly be seen from the outside.

The coupling-out element comprises, in particular, prism structures which are formed in such a way that the light coupled out there is essentially emitted into the exterior and / or the interior of the vehicle. In this way, depending on the application, undesired light emission into the interior can be avoided, for example when the largest possible part of the coupled-in light is to be used for a signal to other road users. For this purpose, the coupling-out area can in particular comprise coupling-out structures in such a way that an intensity distribution is designed as a function of a viewing angle such that a maximum of the coupled-out light is visible to the other road user. On the other hand, by means of suitable structures, light emission can be directed specifically into the interior space, for example in order to achieve illumination of the interior space.

In a further embodiment, an activation signal can also be detected by a detection unit and the light emission can be generated as a function of the activation signal. For example, the activation signal can be received on the basis of an approach of an activation object, for example a key or a mobile user device, or on the basis of user actuation, for example by means of a radio signal or actuation of an operating element of the vehicle. In this way, for example, a greeting for a user can be implemented, for example by activating a light function when a user approaches the vehicle, unlocks it, gets in or brings about a certain operating state.

In a further development, an ambient brightness can also be detected by a detection unit and the light emission can be generated as a function of the ambient brightness. As a result, a particularly clearly visible light distribution can advantageously be generated.

For example, the light emission can be stronger the brighter the environment is, for example in daylight, so that the luminous surfaces couple out correspondingly bright light and the light functions are particularly clearly visible. Conversely, in a dark environment, the light emission can take place with lower intensity, for example to avoid dazzling other road users.

The light functions and in particular the intensity of the coupled-in light can also be formed as a function of a traffic situation, which is recorded for example by means of sensors in the vehicle or by means of a data connection to other vehicles (Car2Car) or another external device (Car2X). For example, in heavy traffic or if there is a short distance from another vehicle behind, the intensity can be designed to be lower or higher, for example in order to output a particularly clearly visible and quickly detectable warning signal.

In one embodiment, position data can also be detected by a detection unit and the light emission can be generated as a function of the position data. The control can thereby advantageously be adapted particularly well to the current situation of the vehicle.

For example, the position can be assigned to a certain type of road, for example a motorway, a residential area or a parking facility. Depending on the currently detected type of road, a specific intensity and / or a specific design of a light function can then be formed. For example, particularly strong intensities of the coupled-in light and the light distribution that is coupled out in the coupling-out areas can be used on a motorway. In contrast, in a residential area in which lower vehicle speeds are assumed, a lower intensity can be used for the coupled-in light. Furthermore, on the basis of the detected position, it can be determined on which side of the road or lane the vehicle is located and the luminous areas, in particular their position, width and / or intensity, can be formed on the basis of this information. For example, a higher or lower intensity can be output when the light emission coupled out from the luminous surface is emitted in the direction of a footpath or another lane.

In a further embodiment, light can be coupled into the pane in such a way that the light from a plurality of light sources, in particular for different light functions, is coupled out through the coupling-out element or a partial area thereof. As a result, light of different intensities and / or colors is mixed if necessary. This can be desired, for example in order to represent a dynamically varying light area if at least one of the light emissions is dynamic. Conversely, however, the light mixing can also be undesirable, with only one of the light functions always being generated to avoid it.

In one embodiment, the coupling-out element comprises a multiplicity of subregions which are in particular arranged in a matrix. In this way, different luminous areas can advantageously be generated in a particularly simple and sharply delimited manner.

For example, the partial areas can be designed as areas with a specific geometric shape, for example rectangles, rhombuses, circles, ovals or points, lines, regular or irregular polygons or other shapes. The surface areas can be arranged uniformly within the matrix, for example by having the same shape and / or size; Furthermore, in this sense, uniform surface areas can be formed in part of the coupling-out area, for example in the case of a matrix with several rows, the surface areas in a row having the same shape and size and rows arranged one below the other differ in the shape and / or size of the surface areas .

Furthermore, distances can be provided between the partial areas. No light is coupled out within these distances, that is, the coupled-in light is conducted within the pane, while the pane is otherwise transparent to light passing through the transparent surfaces. A suitable choice of the distances and the size of the coupling-out elements can ensure that a certain transmission is achieved and / or that an undisturbed view is possible through a certain portion of the transparent area.

In a further embodiment, the coupling-out element has a network-like structure, the coupling-out element in particular comprising at most 40% of the transparent area of the pane. In this way, a particularly easily recognizable light emission can advantageously be generated.

For example, the coupling-out element can form an area which corresponds to a network structure formed from polygons or circular shapes. Such a network structure can be formed by interwoven, intersecting narrow and elongated luminous surfaces. Furthermore, stripes, checkered areas or other patterns can be formed. Furthermore, at least a partial area of the coupling-out element can be designed as a logo or brand; furthermore, for example, graphic elements or written representations, for example for representing a model type, can be included.

In the method according to the invention for operating a vehicle window device, the vehicle window device comprising a flat pane which has two transparent surfaces along its flat extension, a protective layer arranged along a transparent surface of the window, at least one coupling-out element arranged between the transparent surface of the window and the protective layer and a light source for If a light emission is emitted, the light emission is coupled into the pane in such a way that a light distribution is coupled out through the coupling-out element.

The method according to the invention is designed to operate the vehicle window pane device according to the invention described above. The method thus has the same advantages as the vehicle window device according to the invention.

• 1 zeigt ein Fahrzeug mit einem Ausführungsbeispiel der erfindungsgemäßen Fahrzeugfensterscheibeneinrichtung,
• 2A und 2B zeigt detailliertere Ansichten des Ausführungsbeispiels der erfindungsgemäßen Fahrzeugfensterscheibeneinrichtung,
• 3A bis 3D zeigen Ausführungsbeispiele von Lichtverteilungen, die bei dem erfindungsgemäßen Verfahren erzeugt werden können und
• 4A und 4B zeigen weitere Ausführungsbeispiele von Lichtverteilungen, die bei dem erfindungsgemäßen Verfahren erzeugt werden können.

The invention will now be explained on the basis of exemplary embodiments with reference to the drawings.

• 1 shows a vehicle with an embodiment of the vehicle window device according to the invention,
• 2A and 2 B shows detailed views of the embodiment of the vehicle window device according to the invention,
• 3A to 3D show exemplary embodiments of light distributions that can be generated in the method according to the invention and
• 4A and 4B show further exemplary embodiments of light distributions that can be generated in the method according to the invention.

In reference to 1 a vehicle with an embodiment of the vehicle window device according to the invention is explained.

The vehicle 1 includes a vehicle window pane 2 that have a passenger compartment of the vehicle 1 from the surroundings of the vehicle 1 separates. The vehicle window pane 2 is designed as a rear window. In further exemplary embodiments, it can be, for example, a front or windshield, a roof window or a side window. The side window panes can be designed in such a way that they can be opened, for example by moving them, starting from a closed position, into a window slot in a door of the vehicle 1 be moved or by another opening mechanism. For this purpose, window lifters or opening devices designed in a manner known per se are provided. The vehicle window pane 2 will be referred to below with reference to the 2A and 2 B explained in more detail.

For the vehicle window pane 2 are two transparent surfaces 11 , 12 so defined that it extends over an area of the vehicle window pane 2 extend and that on these transparent surfaces 11 , 12 incident light mainly through the vehicle window pane 2 passes through without it being coupled into the pane and for guiding the light inside the vehicle window pane 2 comes from total reflection. Through the transparent surfaces 11 , 12 A vehicle occupant can pass through from the interior of the vehicle 1 look into the outside space. The vehicle window pane 2 can through the transparent surfaces 11 , 12 have different transparency values. For example, foils can be used to darken windows in the rear of the vehicle 1 be used. The vehicle window pane 1 can also, especially if they are in front of the B-pillar of the vehicle 1 is arranged to have a transmission of at least 70%, preferably at least 80% for light of the visible spectrum. Furthermore, measures can be provided which cause absorption or transmission of light, in particular to prevent certain radiation from penetrating into the vehicle interior. For example, a coating can be provided that prevents infrared thermal radiation from entering outside in the vehicle interior prevented or reduced.

Perpendicular to the transparent areas 11 , 12 the vehicle window pane 2 run narrow sides 13 , 14th in an edge area. The narrow sides 13 , 14th run essentially perpendicular to the direction of extent of the transparent surfaces 11 , 12 . In the embodiment are on the narrow sides 13 , 14th Light sources 4th , 5 , 6th arranged, which in turn each have a plurality of luminous elements 5a , 5b include, of which in 1 only some are shown as examples. The light sources 4th , 5 , 6th are arranged so that from the lighting elements 5a , 5b the light emitted through the narrow sides 13 , 14th into the vehicle window pane 2 is coupled. It hits an area of the narrow side in such a way that the light through the surface into the vehicle window pane 2 occurs and runs therein at an angle above the critical angle of total reflection. That is, light that hits an interface between the volume of the vehicle window pane 2 and another medium, in particular air in the environment, is reflected and in the volume of the vehicle window pane 2 forwarded.

During the coupling, a direction of propagation of the light from the light sources is also determined 4th , 5 , 6th defined, wherein a direction is defined as the direction of propagation, that of a center of gravity line or an optical axis of one of each of a luminous element 5a , 5b is assigned to emitted light emission. In particular, the luminous elements emit 5a , 5b of the light sources 4th , 5 , 6th Light bundles which have a narrow opening angle of, for example, less than 25 °, preferably less than 15 °. Alternatively, the light elements 4th , 5 , 6th light distributions generated by optical devices, such as mirrors or lenses, are changed in further exemplary embodiments in such a way that the light upon coupling into the vehicle window pane 2 is coupled in as a light beam with said narrow opening angle.

In the embodiment are on the vehicle window pane 2 , in particular an ESG pane, two layers are applied, namely a partially prismatically structured film and a protective film made of glass. Both are fastened in each case in particular by means of adhesive transfer film without a carrier. The structure of the vehicle window pane 2 is referenced below to 2A and 2 B explained in detail.

The vehicle window pane 2 in the exemplary embodiment has a coupling-out area 3 on. In the coupling area 3 are the decoupling elements on the vehicle window pane 2 arranged that light coupled into the pane is coupled out. In particular, the outcoupling area comprises structures in which the vehicle window pane 2 guided light does not impinge at an angle greater than the critical angle of total reflection, so that instead of reflection, transmission occurs, that is, passage through the interface into the surrounding medium, in particular the air in the vicinity of the vehicle 1 . In the example, the decoupling takes place in such a way that light is essentially radiated outwards, with the radiation predominantly in an area behind the vehicle 1 he follows. The extraction area 3 will be referred to below with reference to the 2A and 2 B explained in more detail.

The light sources 4th , 5 , 6th are with a control unit 7th coupled, as well as a registration unit 8th . Through the control unit 7th are the individual lighting elements 5a , 5b of the light sources 4th , 5 , 6th separately controllable.

Through the registration unit 8th becomes an ambient brightness in the vicinity of the vehicle in the exemplary embodiment 1 recorded in a known manner. Furthermore, user inputs can be recorded and used by the control unit 7th are processed.

In addition, in the exemplary embodiment by the detection unit 8th Position data can be recorded. In the example, these include a pose of the vehicle 1 , that is, information about its position in a global coordinate system or relative to a local landmark and about the orientation of the vehicle. In particular, on the basis of the acquired position data, it is determined on which type of road and on which side of the road the vehicle is located 1 is located. It can also be detected whether the vehicle 1 is parked in a parking garage.

With reference to the 2A and 2 B more detailed views of the exemplary embodiment of the device according to the invention are explained, starting from the exemplary embodiment of the device according to the invention explained above.

2A shows a schematic and not to scale cross section of the vehicle window pane 2 according to the embodiment. The vehicle window pane 2 has a pane on the side of the vehicle interior 2a which is formed in a manner known per se. In particular, the disc 2a designed as a single pane of glass in the manner of a toughened safety glass pane (ESG pane). In further embodiments, the disk comprises 2a a composite of several glass panes and / or at least one glass pane and further layers, such as foils, coatings and / or adhesive layers. In particular, the disc 2a when Laminated safety glass pane (VSG pane) be formed.

The vehicle window pane 2 of the exemplary embodiment further comprises a prism sheet 2 B , which by means of a thin adhesive layer, not shown, here a transfer adhesive film with a thickness of about 0.05 mm, on the exterior of the vehicle 1 facing side of the disc 2a is glued on. Furthermore, there is a protective layer over the prism film, that is to say further on the side facing the outside space 2c glued on, which in the exemplary embodiment is formed by means of a glass layer, in particular Gorilla-Glass® (Corning). This has a thickness of 0.4 mm with a density of 2.42 g / cm ³ . The Vickers hardness level is 596 kgf / mm ² with a load of 200 g. The transmittance here is also> 90%. Also the protective layer 2c is by means of a thin adhesive layer (not shown) on the surface of the prism sheet 2 B glued, here with a transfer adhesive film about 0.05 mm thick. All layers 2a , 2 B , 2c These structures are made transparent, with at least 70% of the on the vehicle window pane 2 incident light is transmitted in the visible range.

The prism sheet 2 B has prismatic structures in the area of the cross section shown 15th on the side facing the exterior, in which the surface is not parallel to the side of the pane facing the interior 2a runs, but at an angle thereto, 45 ° in the embodiment. The partial surfaces of the prismatic structures 15th accordingly have an angle of 90 ° to one another. The prism sheet 2 B is formed from polycarbonate (PC) in the exemplary embodiment and has a thickness of 0.5 mm, the prismatic structures 15th protrude into the volume of the film to a depth of 0.17 mm. The transmittance of the prism sheet 2 B is more than 90%. In the embodiment, there is in the cavities between the prism sheet 2 B and the protective layer 2c in the area of prism structures 15th Air. That is, in the disc 2a or in the vehicle window pane 2 In these areas, coupled light hits an interface between the optically denser medium of the prism sheet and the optically thinner medium of the air. The light then passes through another interface from the air-filled space within the prism structure 15th in the protective layer 2c and from this in turn into the air of the outside space. The prism structures 15th are designed in such a way that coupled light that hits these areas is coupled out into the outside space. In further exemplary embodiments, another medium, which is the depressions of the prismatic structures, can be used instead of air 15th fills and influences the coupling-out properties, especially through its optical density.

Both layers are attached with adhesive transfer tape. This is both temperature and water resistant. The transfer adhesive film is also resistant to the influence of ultraviolet (UV) radiation, which in particular should not lead to degradation. In the case of other types of bonding, it must be ensured that the mechanical properties of the prism film or the beam path must not be influenced. Furthermore, no adhesive is applied to the areas of the film provided with prismatic structures.

In the exemplary embodiment, the prism structures are designed in such a way that coupling is primarily in the direction of the exterior of the vehicle 1 he follows. In further exemplary embodiments, the decoupling can take place in such a way that the decoupled light in various ratios to the outside and into the interior or essentially only into the interior of the vehicle 1 he follows.

The configuration of the exemplary embodiment leads to an additional weight of approximately 170 g with a pane area of 0.28 m ² , so that window regulators and similar mechanisms are no longer excessively stressed.

In further exemplary embodiments, other decoupling elements and / or other types of structuring for decoupling light from the vehicle window pane can be used 2 be used. For example, OLED elements can be arranged on the surface, the transmission properties of which can be changed by applying a voltage, so that switchable coupling-out structures can also be provided here. Furthermore, the coupling-out elements can, for example, be in the pane 2a include etched or engraved structures.

2 B shows, also schematically and not to scale, a plan view of a see-through surface of the vehicle window pane 2 , where the coupling area 3 with a large number of diamond-shaped coupling elements 3a is highlighted. In the exemplary embodiment, the prism structures are in these areas 15th in the prism sheet 2 B educated. The light sources are on the side 4th , 5 , 6th shown. Here are the light sources 4th , 5 , 6th arranged so that the lighting elements of two lateral light sources 5 , 6th Light with an essentially horizontal direction of propagation from the right or left side into the vehicle window pane 2 couple in, while the light elements of another light source 4th Light with a substantially vertical direction of propagation from below into the vehicle window pane 2 coupled. The light emissions and the coupling are each formed in such a way that the light source from each luminous element 4th , 5 , 6th coupled light respectively along a strip across the extent of the vehicle window pane 2 propagates in the respective direction of propagation. For this purpose, optical elements can be provided for changing the individual light emissions appropriately.

This coupling and propagation of the light within a strip along the surface of the vehicle window pane 2 leads to the fact that coupling-out elements arranged along this strip 3a in the coupling-out area 3 are exposed to light and that there is a light decoupling. That is, every luminous element of the light sources 4th , 5 , 6th is certain decoupling elements 3a the coupling-out area 3 assigned. The decoupled light is illuminated by the decoupling elements 3a decoupled and a luminous area formed in this way is from the illuminated decoupling elements 3a composed, which are arranged within a strip in the coupling-out area.

At an edge of the disk opposite the light source 2 in the exemplary embodiment, an illumination of approximately 50 to 100 Ix is to be achieved. This can be achieved by choosing an appropriate brightness for the LEDs, which act as lighting elements 5a , 5b can be used. For example, the illuminance used by the light sources is 4th , 5 , 6th between 3 μm and 30 μm, preferably between 5 μm and 20 μm.

For example, twenty LEDs placed at the lower edge of the pane with an illuminance of 1 Im, a beam angle of 120 ° and a color temperature of 7000 K, which corresponds to cold white light, are used. Such LEDs can be operated with a current of 20 mA at a voltage of 3.3 V, for example. In the example, by dimming the LEDs, an illuminance of 10.17 lm is achieved, with the LEDs being separately controllable and adjustable. this enables uniform, homogeneous illumination of the pane 2 occur even though parts of the pane are illuminated by more LEDs than others due to overlapping light emissions.

The light elements 5a , 5b the light source 4th , 5 , 6th are so on the disc 2 attached that light emitted by them through the narrow side 13 , 14th in the disc 2 is coupled. The connection can take place, for example, by means of a part manufactured using the injection molding process, which is referred to below as a “connection” and which is formed from polyamide, for example. This part can be clamped to the edge of the pane-film combination by means of a press fit and carries the lighting elements arranged in a row 5a , 5b . In the exemplary embodiment, LEDs with a radiation angle of 120 ° are used, but a one-sided radiation angle of 45 ° across the pane is used 2 required to meet the conditions for total internal reflection. Therefore, the beam angle is focused to 90 °. The connection is formed so that the distance between the LED and the edge of the pane 2 is set to 2.5 mm, so that the coupled light at an angle above the critical angle on the transparent surfaces 11 , 12 the disc 2 hits and total reflection within the disc 2 is achieved. The connection to the board with LEDs, which is the light source 4th , 5 , 6th is made by connecting pins, also by means of a press fit. Through the connection and the circuit board with the LEDs, an additional weight of about 100 g is achieved, which has to be moved, for example, by a window regulator

In one embodiment, the acquisition unit 8th Position data is recorded and an evaluation determines which type of road the vehicle is on 1 is located. An operating mode is also determined, a distinction being made as to whether the vehicle is parked or being driven and whether an at least partially automated driving mode is activated. Finally, the position data is used to record the area in which a parked vehicle is parked, in particular whether it is parked on a roadside, in a larger parking lot or in a parking garage. The light sources 4th , 5 , 6th is controlled in such a way that a light distribution is generated depending on the position data and the information determined on the basis of the position data.

For example, decoupling elements 3a , which output a light distribution in the form of an advertising graphic, acted upon by coupled light to generate the light distribution when the corresponding pane is in the parked vehicle 1 facing a footpath. In other examples, this light distribution can, conversely, be output when the corresponding pane is facing the road or the approaching traffic. Furthermore, the intensity of the light that is coupled out during the light distribution can be formed as a function of the position, for example by outputting a lower or higher intensity on a heavily traveled road than on a weakly traveled road. Furthermore, depending on the type of road being traveled on, certain light functions can be activated, for example by using a wiper indicator and a dynamic brake light by means of decoupling elements on a motorway 3a can be output, while with another type of road only the dynamic brake light is output.

Furthermore, with a certain automatic operating mode, a light distribution can be generated which indicates to the surrounding traffic that the vehicle 1 automatically controlled the interior lighting for the vehicle 1 provides and / or the interior of the vehicle 1 makes it less visible from the outside.

With reference to the 3A to 3D Exemplary embodiments of luminous areas that can be generated in the method according to the invention are explained. The above with reference to the 1 , 2A and 2 B illustrated embodiment of the vehicle window device according to the invention. The light functions “wiper indicator” and “dynamic brake light” provided in this case are generated in the exemplary embodiment when the vehicle is moving 1 is on roads of a certain type of road.

The in 3A The case shown emit the three lower luminous elements of the light sources 5 , 6th on the right or left edge of the vehicle window pane 2 Light, while the two upper lighting elements of the light sources 5 , 6th do not emit light at the side edges. In this way, the lower six rows of coupling-out elements become the coupling-out area 3 illuminated and there is coupled light from the vehicle window pane 2 in the vicinity of the vehicle 1 decoupled. Luminous or activated elements are shown hatched here, while non-luminous or non-activated elements are shown as unstructured areas.

The in 3B The case shown emit all the luminous elements of the light sources 5 , 6th on the right or left edge of the vehicle window pane 2 Light. As a result, in the exemplary embodiment, all of the coupling-out elements are in the coupling-out area 3 illuminated and there is a decoupling of light.

Through the in the 3A and 3B A dynamic brake light is implemented. The registration unit 8th detects the strength of a braking on the basis of one by the vehicle 1 provided braking force. In further exemplary embodiments, the strength of braking and other parameters can be detected, for example by detecting the actual deceleration or acceleration of the vehicle 1 and based on the position of a brake pedal. The recorded value is sent to the control unit 7th transmitted, which then the light sources 4th , 5 , 6th controls in the manner described above. The more light elements of the light sources arranged on the side shine 5 , 6th , the stronger the detected braking force. The light sources start to shine from below. This means that when braking is weak, fewer light-emitting elements are activated and there is only light in one of the lower edge of the coupling-out area 3 outgoing part of the outcoupling elements over the entire width of the outcoupling area 3 decoupled. With a higher braking force, up to a maximum representable value of the braking force, more and more light-emitting elements light up, so that the decoupling is also carried out in areas of the decoupling area arranged further up 3 he follows. With a maximum representable value of the braking force or with a higher braking force, the entire decoupling area lights up 3 , as in 3B shown.

In the exemplary embodiment, the light-emitting elements are the laterally arranged light sources 5 , 6th designed as red light-emitting diodes, which consequently emit red light, as is usual with a brake light. In further exemplary embodiments, alternatively or additionally, light of a different color can also come from the light sources 5 , 6th are emitted. For this purpose, for example, differently colored light elements can be used, in particular RGB LEDs, the color of which can be set by means of a suitable control. In a further exemplary embodiment, alternatively or additionally, the intensity of the coupled-in light is formed as a function of the detected strength of the braking process, for example light of a higher intensity is coupled in if a greater strength was detected. Furthermore, the light function can have a blinking or a movement in the illuminated area or some other additional characteristic, which is also formed as a function of the strength of the braking.

The in 3C The case shown emit four adjacent luminous elements of the light source 4th on the lower edge of the vehicle window pane 2 Light, while the other light elements shown and the laterally arranged light sources 5 , 6th do not emit light. In this way there are coupling-out elements of the coupling-out region which are arranged next to one another in five columns 3 illuminated and there is coupled light from the vehicle window pane 2 in the vicinity of the vehicle 1 decoupled.

The in 3D case shown all emit along the right half of the vehicle window pane 2 arranged light elements of the lower horizontal light source 4th Light, while the light elements arranged in the left half of the light source 4th as well as the laterally arranged light sources 5 , 6th do not emit light. As a result, all the coupling-out elements are in the area of the right half of the coupling-out area 3 exposed to light and this results in a decoupling of the light into the environment outside the vehicle 1 .

Through the in the 3C and 3D A wiper indicator is implemented. The registration unit 8th detects an actuation of an operating element, such as a flasher lever, whereby a direction indicator is activated. In further exemplary embodiments, a steering wheel angle or a speed of the change in the steering wheel angle can be detected. The control unit controls as a function of this detected actuation 7th the light sources 4th , 5 , 6th in the manner described above. The display of the luminous areas takes place in the manner of a periodically illuminated running light, the illuminated luminous area from the center of the coupling-out area 3 starting from the side edge grows. This means that when the indicator flashes to the right, the illuminated part of the coupling-out area grows 3 starting from the center to the right, as in the 3C and 3D indicated. If it flashes to the left, the process is carried out analogously to the left. The flashing frequency can be determined on the basis of other parameters, for example a vehicle speed, a criticality of a traffic situation, a distance from a following vehicle or a distance to a position at which the vehicle is located 1 to turn, for example, are formed, for example about an urgency of a change of direction of the vehicle 1 to display.

In further exemplary embodiments, the dynamic display can take place in a different way, for example in that the illuminated luminous area, after it has extended from the center to the edge, shrinks again in the same direction, the luminous elements being deactivated starting from the center outwards. Furthermore, a “wandering” luminous area of constant width can be generated, which, for example, is shifted in the blinking direction starting from the center or from the side facing away from the blinking direction.

In the exemplary embodiment, the lighting elements are horizontal on the lower edge of the vehicle window pane 2 arranged light source 4th designed as yellow or orange light-emitting diodes, which therefore emit yellow light, as is usual with a flashing light. In further exemplary embodiments, the light-emitting elements can alternatively or additionally also emit light of a different color, for example by using light-emitting elements of different colors or variable-color RGB LEDs.

In further exemplary embodiments, other light functions can be implemented, for example a hazard warning flasher, in which coupling-out elements are illuminated starting from the center to both sides or upwards and downwards in the manner of a running light, or by lighting elements of the light sources 4th , 5 , 6th activated flashing. The different ways of illuminating the luminous elements of the light sources 4th , 5 , 6th can also be combined.

The lighting, especially with a dynamic change in the activated light sources 4th , 5 , 6th and correspondingly changing lighting areas, can furthermore be combined by adding both light with a horizontal and with a vertical direction of propagation into the vehicle window pane 2 is coupled. In this way, light mixtures can be decoupled by decoupling elements. Furthermore, such a mixture can be represented with an intensity and / or color that changes over time if at least one of the light sources involved is operated in a dynamically changing manner. In one embodiment, the vehicle is in an automatic drive mode 1 detected and depending on the detected driving mode, the light sources 4th , 5 , 6th operated in such a way that a certain light function is generated that indicates the driving mode. For example, in this way a “wavy” flat light emission can be coupled out, in which the intensity and / or color of the light distribution is within the coupling-out area 3 periodically or dynamically changed in some other way.

In further exemplary embodiments, the intensity of the through the light sources 4th , 5 , 6th emitted light are formed based on a control signal. For example, the acquisition unit records 8th an ambient brightness in the vicinity of the vehicle 1 . The brightness with which the light functions are output is based on the ambient brightness. The intensity can also be formed on the basis of other parameters, for example on the basis of the distance to a vehicle behind, a criticality, a traffic situation or a number of other road users in the vicinity of the vehicle 1 .

In a further embodiment, the detection unit receives 5 an activation signal and the control unit controls as a function of the detected activation signal 7th the light sources 4th , 5 , 6th so that a welcome light distribution is issued. The activation signal can be detected, for example, when approaching, for example when a mobile user device is within a predetermined distance from the vehicle 1 approaching. The welcome light distribution can depend on the user to which the mobile user device is assigned, the user or the user device being identified for this purpose. Furthermore, the intensity can depend on an ambient brightness, so that the vehicle 1 for example, can be found particularly well in the dark. In another example, when unlocking the vehicle 1 a light distribution can be output through which, for example, the user is welcomed, whereby also Here, the light distribution can be personalized depending on the respective user.

The intensity of the light that is coupled out depends on the position of the vehicle 1 formed, whereby in a parking garage the light distribution is output with a higher intensity than at a roadside. In further exemplary embodiments, the distance at which the greeting light distribution is generated can also be from the position of the vehicle 1 depend.

With reference to the 4A and 4B further exemplary embodiments of light distributions that can be generated in the method according to the invention are explained. The above with reference to the 1 , 2A and 2 B illustrated embodiment of the vehicle window device according to the invention.

This in 4A The vehicle shown schematically has a side window pane 41 which is formed with a vehicle window device according to the invention. There is also a section 40 is shown, which shows structures of a partially lowered window lying within a vehicle door. A window lifter formed in a manner known per se is used for lowering.

By the side window pane 41 is a decoupling area 3 like in the 2A and 2 B shown formed, the decoupling elements 3a are formed as net-like interwoven lines. In the cutout 40 it can be seen that this net-like structure extends over the entire surface of the side window pane 41 extend. It is from a lower narrow side 13 , 14th Coupled light, the light source 4th , 5 , 6th at the cutout 40 along the lower narrow side 13 , 14th is arranged and not shown separately.

The in 4B The vehicle also shown schematically is a side window pane 42 and a rear window 43 with decoupling elements 3a shown, which form strip-like and intersecting luminous areas.

In further exemplary embodiments, other light distributions can be generated, each through the shape, arrangement and design of the coupling-out elements 3a to be determined. Furthermore, by controlling one or more light sources differently 4th , 5 , 6th various decoupling elements 3a can be illuminated or the lighting can be based on different intensities, colors or with different dynamic effects such as flashing or a running light.

In a further exemplary embodiment, the coupling-out elements are 3a designed so that they represent a logo, a brand or a graphic representation, in particular an advertising graphic. The decoupling elements 3a can also be used to illuminate the surroundings of the vehicle as comprehensively as possible or in a specific area 1 be formed, for example in that a radiation angle for the coupled-out light is formed such that a certain predetermined area in the vicinity of the vehicle is illuminated by the light distribution generated.

List of reference symbols

1

vehicle

2

Vehicle window pane

2a

disc

2 B

Foil, prism foil

2c

Protective layer

3

Outcoupling area

3a

Decoupling element

4, 5, 6

Light source

5a, 5b

Luminous element

7th

Control unit

8th

Registration unit

11

See-through area

12

See-through area

13

Narrow side

14th

Narrow side

15th

Prism structure, decoupling element

40

Cutout

41

Side window pane

42

Side window pane

43

rear window

QUOTES INCLUDED IN THE DESCRIPTION

This list of the 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.

Patent literature cited

• US 7791785 B2 [0004]
• DE 102017216657 A1 [0005]

Claims (10)

Vehicle window device with a flat pane (2a) which has a transparent surface (11, 12) along its flat extension; a protective layer (2c) arranged along the transparent surface (11) of the pane (2a); at least one decoupling element (3a, 15) arranged between the transparent surface (11) of the pane (2a) and the protective layer (2c); and a light source (4, 5, 6) for emitting light emission; in which the light emission can be coupled into the pane (2a) in such a way that a light distribution can be coupled out through the coupling-out element (3a, 15). Vehicle window device according to Claim 1 , characterized in that the protective layer (2c) is formed from aluminosilicate glass. Vehicle window device according to one of the preceding claims, characterized in that the coupling-out element (3a, 15) comprises a film (2b) with prismatic structures (15). Vehicle window device according to one of the preceding claims, characterized in that the light source (4, 5, 6) comprises a plurality of lighting elements (5a, 5b) which are arranged along a narrow side (13, 14) of the window (2a). Vehicle window device according to one of the preceding claims, characterized in that the decoupling element (3a, 15) is formed such that at least 80% of the decoupled light distribution is directed into an outside space of the vehicle (1). Vehicle window pane device according to one of the preceding claims, characterized in that an activation signal can also be detected by a detection unit (8) and the light emission can be generated as a function of the activation signal. Vehicle window pane device according to one of the preceding claims, characterized in that an ambient brightness can also be detected by a detection unit (8) and the light emission can be generated as a function of the ambient brightness. Vehicle window pane device according to one of the preceding claims, characterized in that position data can also be detected by a detection unit (8) and the light emission can be generated as a function of the position data. Vehicle window device according to one of the preceding claims, characterized in that the coupling-out element (3a, 15) has a network-like structure, the coupling-out element (3a, 15) comprising at most 40% of the transparent area of the pane (2a). A method for operating a vehicle window device, the vehicle window device comprising a flat pane (2a) which has two transparent surfaces (13, 14) along its flat extension, a protective layer (2c) arranged along a transparent surface (11, 12) of the pane, at least one between decoupling element (3a, 15) arranged on the transparent surface (11) of the pane (2a) and the protective layer (2c) and a light source (4, 5, 6) for emitting a light emission; where in the process: the light emission is coupled into the pane (2a) in such a way that a light distribution is coupled out through the coupling-out element (3a, 15).

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