WO2018215317A1

WO2018215317A1 - Pane arrangement with electrical connector

Info

Publication number: WO2018215317A1
Application number: PCT/EP2018/063030
Authority: WO
Inventors: Bernhard Reul; Emmanuel WALCH
Original assignee: Saint-Gobain Glass France
Priority date: 2017-05-24
Filing date: 2018-05-18
Publication date: 2018-11-29
Also published as: CN109302859A

Abstract

The present invention relates to a pane arrangement, comprising: - a laminated pane (2), comprising an outer pane (3) and an inner pane (4), which outer pane and inner pane are connected to one another by means of a thermoplastic intermediate layer (5), and an electrically conductive coating (6) between the outer pane and the inner pane, which electrically conductive coating is electrically connected to at least one busbar (7) which is intended to be connected to a pole of a voltage source, wherein the busbar (7) has a contact section (12) in order to allow electrical contact to be made with it, wherein the inner pane (4) has at least one opening (11), wherein the contact section (12) is accessible through the opening (11), - at least one electrical connector (9) comprising a first connector piece (13) and a second connector piece (14), which first connector piece and second connector piece can be mechanically connected to one another, wherein the first connector piece (13) has a contact element (17) which can be electrically connected to the pole of the voltage source, wherein the second connector piece (14) is fastened to the inner pane (4) in the region of the opening (11), and wherein the electrical connector (9) is designed such that, in the mechanically connected state of the two connector pieces (13, 14), the contact element (17) comes to rest against the contact section (12) of the busbar (7).

Description

Disc arrangement with electrical connector

The invention relates to a disc assembly with a laminated disc and

at least one electrical connector for electrically contacting at least one current busbar, and a method for their preparation.

Vehicle windows with a transparent, heatable coating are well known. By way of example, reference is made to the publications WO 03 / 024155A2,

US 2007 / 0082219A1, US 2007 / 0020465A1, EP 2274251 A1, EP 1980137B1 and

EP 1454509B1. They are used in particular as windscreens, for which particularly high optical requirements apply. The coating allows the windshield to be equipped with an active heating function to free it from fogging or ice, if necessary, without affecting the visibility of heating wires or printed heating conductors. Heatable coatings are usually multilayer systems, which in particular contain silver layers. They are electrically contacted with at least two strip or ribbon-shaped current busbars, which should initiate the current as evenly as possible in the coating. A current flows through the coating between the current busbars, forming a heating field. Also known is the use of the electrically conductive coating as

Planar antenna.

In the design of laminated vehicle windows with electrically conductive coating, the challenge of a simple and inexpensive electrical

Contacting the current collection conductor, which also allows the lowest possible reject rate. So far, flat band connections are used for contacting the busbars typically laid on the Strommasischienen,

optionally soldered, and laminated between the two individual slices. The ribbon connections are led out laterally between the discs from the composite disc. The disadvantage here is the risk of damage to the Flachbandan- conclusions during packaging, transport and installation of the vehicle windows. To make matters worse, if damage to the ribbon cable connections, the vehicle window can not be used because the laminated flat ribbon connections can not be replaced or replaced. As a result, the committee increases in the production of vehicle windows in an undesirable manner. In addition, certain cost-effective manufacturing processes (eg so-called "nip-roll processes") can not be used, since damage to the ribbon connections is to be feared. In contrast, the object of the present invention is to provide an electrical contact of the current collection conductor of a laminated vehicle window, by which the aforementioned disadvantages can be avoided.

In addition, the laminated vehicle window in industrial mass production should be simple and inexpensive to produce.

These and other objects are according to the proposal of the invention by a

Disc arrangement solved according to claim 1. Preferred embodiments will become apparent from the dependent claims.

According to the invention, a disk arrangement, in particular a vehicle disk arrangement, is shown. The disc assembly comprises a laminated disc, in particular a laminated vehicle window, and at least one electrical connector for electrically contacting at least one busbar.

The laminated pane is provided for separating an interior, in particular a vehicle interior, from an external environment. In particular, the laminated pane is a vehicle window which is used as a window pane in or provided for a window opening of a vehicle body. The vehicle window is in particular a windshield of a motor vehicle.

The laminated disc comprises at least a first and a second disc, which are firmly connected to one another via a thermoplastic intermediate layer. The two discs can also be referred to as outer pane and inner pane. With inner pane that disc is referred to, which faces the interior, such as a vehicle, in the installed position. With outer pane that disc is referred to, which faces in the installed position of the external environment, such as a vehicle. The thermoplastic intermediate layer is typically formed from at least one thermoplastic film.

That surface of the respective pane which faces in the installation position of the external environment, for example of a vehicle, is referred to as the outside surface. That surface of the respective pane which, in the installation position, faces the interior, for example of a vehicle, is referred to as the interior-side surface. The interior-side surface of the outer pane is connected to the outside surface of the inner pane via the thermoplastic intermediate layer. customarily That is, the outer side surface of the outer pane is referred to as "side I", the inner side surface of the outer pane as "side II", the outer side surface of the inner pane as "side III" and the inner side surface of the inner pane as "side IV".

The laminated pane furthermore comprises an electrically conductive coating which is arranged between the inner pane and the outer pane, in particular on the surfaces facing the thermoplastic intermediate layer (page II or page III), where the heatable coating in the laminate is advantageously protected against corrosion and damage is. Alternatively, the heatable coating can be incorporated in the thermoplastic intermediate layer, in particular on a polymeric carrier film within the intermediate layer. The electrically conductive coating can serve, for example, as a heating layer for active heating of the pane or as an area antenna. For the purposes of the invention, the term "coating" includes one or more layers, with directly adjacent layers consisting of different materials.

The electrically conductive coating is in particular transparent. In the context of the invention, a transparent coating is understood to mean a coating which has a transmission of at least 70% in the visible spectral range, preferably at least 80%, particularly preferably at least 90%.

The electrically conductive coating is electrically contacted with at least one current busbar, in particular with at least two current busbars. The power busbars are often referred to as busbars or collecting electrodes. They are typically formed strip or strip-shaped and serve to introduce the current as homogeneously as possible across the width of the coating in this. The at least one current busbar is provided for electrical connection to a pole of a voltage source. When the electrically conductive coating is contacted with at least two current bus bars, these current bus bars are provided for electrical connection to both poles of a voltage source. Typically, the one or more bus bars are arranged directly on or below the electrically conductive coating, so are in direct contact with the coating.

For electrically heating the pane, the electrically conductive coating is electrically connected to at least two bus bars in such a way that a heating current flows between the bus bars by applying a supply voltage As a result of the electrical resistance of the coating and the associated heating, a heating field is formed between the current busbars.

According to the invention, at least one current busbar has a contact section which is provided for electrical contacting of the current busbars. In particular, the current busbar is exposed in the contact portion, i. is not covered, and is freely accessible through an opening in the inner pane. The inner pane has for this purpose at least one opening (aperture) which is arranged so that the contact portion of the at least one Stromomsammeiene rail is freely accessible for electrical connection, i. can be contacted in particular by touch contact.

Accordingly, the laminated disc is formed so that the contact portion of at least one current busbar is accessible through the opening of the inner pane and can be electrically contacted, wherein the current collection conductor is exposed in the contact portion in particular and can be contacted by touch contact. The contact portion of the Stromomsammeischiene and the opening are arranged for this purpose at least partially superposed (overlapping each other). That is, the projection (perpendicular to the slice plane) of the opening onto the contact portion of the current busbar corresponds to at least a portion of the contact portion.

By way of example, the current busbar is located directly adjacent to the surface facing the intermediate layer (side III) of the inner pane. However, it is also possible that the current busbar not directly adjacent to the side III of the inner pane, but by at least one further layer, for example an insulating layer, is spaced from the inner pane, so that the Stromomsischiene, in addition to the opening of the inner pane, is exposed in the contact portion (By removing the at least one further layer) to allow electrical contact.

In particular, at least two current busbars each have a contact section for their electrical contacting, the contact sections being different from one another. In this case, the current busbars can be arranged one above the other at least in an overlapping region but electrically isolated from one another, wherein the contact sections are in this overlap region. Preferably, but not necessarily, the at least one opening of the inner disk is formed as a circular opening (hole), which is a simple, inexpensive and comparable wise low-fired production by drilling allows. It is also conceivable, however, to introduce the opening into the inner pane by a cutting method, for example laser cutting method. The disc assembly according to the invention further comprises at least one electrical connector for electrically connecting at least one pole of a voltage source to at least one current busbar. The electrical connector comprises a first connector piece and a second connector piece which are mechanically connectable to each other but are preferably electrically isolated from each other in the connected state. The two connector pieces are each formed as a rigid, non-flexible body (at least at room temperature), in contrast to the known in the art flat ribbon terminals, which are flexible.

The two connector pieces can in principle be of any desired design, as long as they are mechanically connectable and enable an electrical connection of at least one pole of a voltage source with at least one current busbar. In an advantageous embodiment of the invention, the two connector pieces are formed in the form of coaxial connector parts, i. the connecting parts can be inserted into one another along a common plug-in axis, which allows a simple connection. For this purpose, the connecting pieces are preferably in each case rotationally symmetrical, for example substantially cylindrical, and each have a (symmetry axis) which defines a common thru-axle.

In a preferred embodiment of the invention, the two connector pieces (destructive free) are detachably connectable or connected to each other, for example by screwing. Advantageously, the two connector pieces are detachably connected or connected to one another by a bayonet closure. The bayonet lock is well known to those skilled in the art. Here, the two connector pieces are connected by nesting and against each other twisting together and can be separated in this way again from each other. A connector piece has for this purpose at least one projection which can engage in a suitably shaped recess or recess of the other connector piece, which usually provided with a detent position. In particular, a spring in latching position can be achieved by a spring loading of the two connector pieces, wherein a spring when nesting of the two connecting pieces is tensioned. The locking position of the sliding guide is designed so that a separation of the two connector pieces is blocked by the spring force. By the bajo nice closure, the two connector pieces of the electrical connector can be connected to each other in a particularly simple manner and separated again.

In an alternative embodiment of the invention, the two connector pieces are fixed, i. non-destructive, interconnected or connected, for example by welding, riveting or gluing.

According to the invention, the first connector piece has a contact element which can be electrically connected or connected to one pole of a voltage source for making electrical contact with the contact section of the at least one current busbar. The contact element contains for this purpose an electrically conductive material, in particular a metallic material. The contact element may consist of an electrically conductive material. The contact element is formed for example in the form of a contact pin. The contact element is typically electrically connected to a conductor of a cable for this purpose.

In the disc assembly according to the invention, the second connector piece is fixedly attached to the inner disc. In particular, the second connector piece is fastened to the inner pane in the region of the opening, ie in the vicinity of the opening. The second connector has a cavity (inner space) for receiving the contact element of the first connector piece in the mechanically connected state of the two connector pieces. Here, the second connector piece is arranged so that the cavity for receiving the contact element opens into the opening of the inner pane and / or at least partially disposed within the opening. The second connector piece is arranged, for example, only on the inside surface (side IV) of the inner pane, wherein the cavity for receiving the contact element opens into the opening of the inner pane. Preferably, the second connector piece has a section inserted into the opening of the inner pane. In the mechanically connected state of the two connector pieces, the contact element of the first connector piece is at least partially received in the cavity of the second connector piece. What is essential here is that the electrical connector is designed such that in the mechanically connected state of the two connector pieces, the contact element comes to rest against the exposed contact section of the at least one busbar to electrically connect the busbar to the pole of the voltage source connect to. The contact element is therefore in touching contact with the contact section of the current busbars.

Advantageously, the contact element is displaceably mounted in the first connector piece against the spring force of a spring, wherein the contact element is loaded in the mechanically connected state of the two connector pieces by the spring force, i. is moved due to the system against the contact portion against the spring force of the spring. In this way, a reliable and secure electrical contact of the contact portion can be ensured, with mounting tolerances can be compensated in a simple manner. If the two connector pieces can be mechanically connected to each other by a bayonet closure, a spring-locked detent position of the bayonet closure can also be realized in a simple manner.

The disc assembly according to the invention advantageously allows a simple and cost-effective electrical contacting of at least one busbar. Since the second connector piece is fixedly attached to the inner disk, damage in packaging, transportation and installation can be avoided, whereby production waste can be reduced. If, nevertheless, a damage of the second connector piece takes place, it can be replaced if necessary, so that the complete disk arrangement does not have to be discarded. In any case, the associated first connector piece can continue to be used. A mechanical connection of the two connector pieces can be done in a simple manner after installation of the disc to the desired mounting parts, for example after installation as a windshield in a motor vehicle. If the two connector pieces are releasably mechanically connected to each other, a simple replacement of the first connector piece, if necessary.

In the disc assembly according to the invention, a single electrical connector may be provided for electrically contacting at least one busbar for electrical connection to one pole of a voltage source, for example supplemented by a ground terminal for the electrically conductive coating, which is different from the electrical connector of the disc assembly according to the invention. It is also possible to provide two electrical connectors for electrically contacting at least two busbars for electrical connection to both poles of a voltage source. In a preferred embodiment of the disk arrangement according to the invention, at least two bus bars each have a (separate) contact section for their electrical contacting, wherein the two contact sections are accessible through the opening of the inner pane. Advantageously, the current busbars have a region in which both current busbars lie one above the other but are electrically insulated from one another, wherein the two contact sections are arranged in this region. Preferably, the region in which both current busbars are arranged one above the other has a recess in which the current busbar covered by the other current collector busbar is exposed.

For contacting the two contact portions only one electrical connector with a first connector piece and a second connector piece is required. The disk assembly thus has only a single electrical connector. The electrical connector is formed such that the contact element of the first connector piece, which is electrically connected to the one pole of the voltage source, abuts against the contact section of one current busbar in the mechanically connected state of the two connector pieces, while the second connector piece contacts the other pole of the first connector piece Voltage source is electrically connected or connected and electrically contacted the contact portion of the other current busbar. The second connector piece contains for this purpose an electrically conductive material, in particular a metallic material. The second connector piece may be made of an electrically conductive material. In the mechanically connected state, the two connector pieces of the electrical connector are electrically isolated from each other. Advantageously, the electrical connector is connected to a coaxial cable with an inner conductor and an outer conductor, wherein the contact element is electrically connected to one of the two conductors, for example inner conductors, while the second connector piece is electrically connected to the other conductor, for example outer conductors. The inner conductor is connectable or connected to one pole of the voltage source and the outer conductor to the other pole of the voltage source. With this configuration, a particularly simple contacting of two bus bars by a single electrical connector is possible, which can be advantageously saved in the time and cost in the manufacture of the disc assembly according to the invention in an advantageous manner.

In the above embodiment of the disc arrangement according to the invention with a single electrical connector, it is advantageous if the second connector piece is electrically connected to the contact section of the other current busbars via a spring washer. is bound. In this way, a reliable electrical connection between the second connector piece and the contact portion of the other current busbars can be achieved, wherein in particular tolerances can be compensated during assembly and material placement. In particular, the second connector piece can have a portion which is inserted into the opening and in this case comes to rest against the contact portion of the current busbar resting spring washer. Preferably, the spring washer has a central opening, so it is annular.

In the pane arrangement according to the invention, the second connector piece preferably has a flange section for attachment to the inner pane, wherein the flange section at least partially, in particular completely, surrounds the opening of the inner pane. The flange section may in particular be arranged in an area of the interior-side surface (side IV) of the inner pane that surrounds the opening. As a result, the second connector piece can be easily and cost effectively attached to the inner pane in industrial mass production.

Preferably, a cost-effective attachment of the second connector piece to the inner pane is effected by an adhesive tape. The connection between the connector piece and the inner pane is optionally detachable, so that the second connector piece can be easily replaced in case of damage or failure and the replacement of the complete disc arrangement is unnecessary.

Advantageously, the second connector piece has an inserted into the opening of the inner pane portion, whereby the second connector piece can be easily positioned and fixed. In particular, the connector portion may be accurately inserted into the opening and abut a wall bounding the opening.

In the pane arrangement according to the invention, the electrically conductive coating has at least one electrically conductive layer. The coating may additionally have dielectric layers which serve, for example, for regulating the sheet resistance, for corrosion protection or for reducing the reflection. The conductive layer preferably contains silver or an electrically conductive oxide (transparent conductive oxide, TCO) such as indium tin oxide (ITO). The conductive layer preferably has a thickness of 10 nm to 200 nm. This achieves a good compromise between transparency and electrical conductivity of the layer. In order to improve the conductivity while at the same time providing high transparency, the electrically conductive coating can carry a plurality of electrically conductive layers. capable of having layers separated by at least one dielectric layer. The conductive coating may include, for example, two, three or four electrically conductive layers. Typical dielectric layers include oxides or nitrides, for example silicon nitride, silicon oxide, aluminum nitride, aluminum oxide, zinc oxide or titanium oxide.

In a particularly preferred embodiment, the electrically conductive coating has at least one electrically conductive layer which contains silver, preferably at least 99% silver. The layer thickness of the electrically conductive layer is preferably from 5 nm to 50 nm, particularly preferably from 10 nm to 30 nm. The coating preferably has two or three of these conductive layers, which are separated from one another by at least one dielectric layer. Such coatings are particularly advantageous with regard to the transparency of the disc and the electrical conductivity.

Preferably, a frame-like edge region of the disc is not provided with the electrically conductive coating. This edge region is frequently also referred to as edge deletion (in the case of a coating applied to a pane) or cutback (in the case of a coating on a carrier film). This ensures that the electrically conductive coating has no contact with the surrounding atmosphere, which prevents corrosion. The electrically conductive coating is as it were encapsulated in the intermediate layer. The width of the coating-free edge region is typically from 0.5 mm to 20 mm, in particular from 1 mm to 10 mm. The visually striking transition from the coated to the uncoated region is typically concealed by an opaque cover printing.

The current busbars may be formed as printed and baked-on paste, in particular screen-printing paste, or as strips of an electrically conductive foil. If the electrically conductive coating is applied to a disk surface, then both variants are suitable. If the electrically conductive coating is applied to a carrier film in the intermediate layer, in particular an electrically conductive film is suitable. The baked-on paste contains at least metal particles, preferably silver particles and glass frits. The layer thickness of the printed Stromomsammeischienen is preferably from 5 μηη to 40 μηη, more preferably from 10 μηη to 20 μηη. Printed busbars with these thicknesses are technically easy to implement and have an advantageous current carrying capacity. The electrically conductive foil preferably contains aluminum, copper, tin-plated copper, gold, silver, zinc, tungsten and / or tin or alloys thereof, more preferably copper. The thickness of the electrically conductive film is preferably from 10 μηη to 500 μηι, more preferably from 30 μηη to 200 μηι, for example, 50 μηη or 100 μηη. Current busbars made of electrically conductive films with these thicknesses are technically easy to implement and have an advantageous current carrying capacity. The electrically conductive film may be directly electrically conductively connected to the electrically conductive coating via a solder compound or an electrically conductive adhesive. To improve the conductive connection, a silver-containing paste may for example be arranged between the electrically conductive coating and the current busbar.

The bus bars are typically arranged along two opposite side edges of the disc, in particular the vehicle window, usually along the upper edge and the lower edge. The designations upper edge and lower edge here refer to the orientation in installation position of the disc. The busbars are a short distance from said side edge (the mean distance to said side edge is less than all other side edges) and their direction of extension substantially follows the direction of the side edge.

The length of the current busbars depends on the design of the panes, in particular the length of the edge along which the current busbar is arranged, and can be suitably selected by the person skilled in the art on a case-by-case basis. The length of the typically strip-like current busbars is understood to be their longer dimension, which extends substantially perpendicular to the current propagation direction. The width of the current busbars is preferably from 1 mm to 20 mm, preferably from 2 mm to 10 mm, whereby a good heating performance can be achieved with a heatable coating.

The inner pane and the outer pane are preferably made of glass, particularly preferably soda-lime glass, which has proven useful for window glass. The discs can also consist of other types of glass, such as borosilicate glass or

Aluminosilicate glass. In principle, the disks can alternatively be made of plastic, in particular polycarbonate (PC) or polymethyl methacrylate (PMMA).

The thickness of the discs can vary widely and be adapted to the requirements in individual cases. Preferably, the thicknesses of the outer pane and the inner pane of 0.5 mm to 10 mm, more preferably from 1 mm to 5 mm, most preferably from 1, 2 mm to 3 mm.

The outer pane, the inner pane or the intermediate layer may be clear and colorless, but also tinted, cloudy or colored. The total transmission through the laminated glass in a preferred embodiment is greater than 70%, especially if the

Laminated glass is a windshield. The term total transmission refers to the procedure defined by ECE-R 43, Annex 3, § 9.1 for testing the light transmission of vehicle windows. The outer pane and the inner pane may be made of non-tempered, semi-tempered or tempered glass.

The disk is preferably bent in one or more directions of the space, as is conventional for automotive windows, with typical radii of curvature ranging from about 10 cm to about 40 m. The laminated glass can also be flat,

for example, if it is intended as a disk for buses, trains or tractors.

The intermediate layer is preferably formed by at least one thermoplastic film. The thermoplastic film contains at least one thermoplastic polymer, preferably ethylene vinyl acetate (EVA), polyvinyl butyral (PVB) or polyurethane (PU) or mixtures or copolymers or derivatives thereof, particularly preferably PVB. The thickness of a thermoplastic film is preferably from 0.2 mm to 2 mm, particularly preferably from 0.3 mm to 1 mm, for example 0.38 mm or 0.76 mm.

If the electrically conductive coating is arranged on a carrier film, then this carrier film is preferably arranged between two thermoplastic films. The

Intermediate layer then comprises at least two thermoplastic compound films and an interposed carrier film with electrically conductive coating.

The carrier film preferably contains at least polyethylene terephthalate (PET), polyethylene (PE) or mixtures or copolymers or derivatives thereof. This is particularly advantageous for the handling, the stability and the optical properties of the carrier film. The carrier film preferably has a thickness of from 5 μm to 500 μm, particularly preferably from 10 μm to 200 μm, and very particularly preferably from 12 μm to 75 μm. Carrier films with these thicknesses can advantageously be provided in the form of flexible and at the same time stable films, which can be handled well. The invention also extends to a method for producing a disc arrangement according to the invention.

The process comprises the following process steps, which are not necessarily to be carried out in the order given:

Providing an outer pane, a thermoplastic intermediate layer and an inner pane, wherein the outer pane, the inner pane or the intermediate layer is provided with an electrically conductive coating,

Connecting the electrically conductive coating to at least one current collector rail provided for electrical connection to one pole of a voltage source,

Bonding the outer pane and the inner pane together by lamination via the intermediate layer,

Exposing a contact portion of the at least one current busbar to the contacting thereof, comprising the introduction of at least one opening in the inner pane,

Providing an electrical connector comprising a first connector piece and a second connector piece mechanically connectable to each other, the first connector piece having a contact element electrically connectable to the one pole of the voltage source,

Attaching the second connector piece to the inner pane,

mechanically connecting the two connector pieces, wherein the electrical connector is formed so that in the mechanically connected state of the two connector pieces, the contact element comes to bear against the contact portion of the bus bar.

The method is in particular carried out so that the second connector piece is fastened in the region of the opening on the inner pane. Here, the second connector piece is arranged so that the cavity for receiving the contact element opens into the opening of the inner pane and / or at least partially disposed within the opening. Exposing the contact portion of the current busbar may, in addition to forming the opening in the inner slide, comprise the removal of one or more further layers until the contact portion is freely accessible through the opening. Before or after the mechanical connection of the two connector pieces, the contact element can be electrically connected to the pole of the voltage source. It is preferred the contact element is electrically connected to the pole of the voltage source prior to the mechanical connection of the two connector pieces. Before or after installation of the disc assembly in a destination, for example in a motor vehicle, the two connector pieces can be mechanically connected to each other. Preferably, the two connector pieces are mechanically connected to each other after installation of the disc assembly in a destination.

If the electrically conductive coating is applied to a surface of one of the panes, the stack for lamination is preferably arranged so that the coating faces the intermediate layer. The intermediate layer is provided in the form of at least one film. If the coating is provided on a carrier film, then this carrier film is preferably arranged between a first thermoplastic film and a second thermoplastic film for lamination. The thermoplastic films together with the carrier film form the intermediate layer.

The electrically conductive coating is applied by means of methods known per se. The coating is preferably carried out by magnetic field-assisted sputtering (sputtering). This is particularly advantageous in terms of a simple, fast, inexpensive and uniform coating of the substrate. Carrier films with heatable coatings are also commercially available, so that the coated carrier film does not have to be specially produced.

The attachment of the current busbars can be done in particular by placing, printing, soldering or gluing.

If the pane, in particular the vehicle window, is to be bent, then the outer pane and the inner pane are preferably subjected to a bending process prior to lamination. Preferably, the outer and inner disks are congruently bent together (i.e., simultaneously and by the same tool) because this optimally matches the shape of the disks for later lamination.

Typical temperatures for glass bending processes are for example 500 ° C to 700 ° C. The bending preferably takes place after application of the heatable coating to one of the panes, because the coating of a flat pane is technically simpler and, in addition, the optical properties of the coating are improved by the heating during bending, without a separate tempering step being necessary. The laminated pane is produced by lamination by conventional methods known per se to the person skilled in the art, for example autoclave methods, vacuum bag methods, vacuum ring methods, calendering methods, vacuum laminators or combinations thereof. The connection of outer pane and inner pane is usually carried out under the action of heat, vacuum and / or pressure.

The invention further extends to the use of the invention

Disc arrangement in means of transport for traffic on land, in the air or on water, in particular in motor vehicles and in particular as

Disc arrangement with a windshield.

The invention will now be explained in more detail by means of embodiments, reference being made to the accompanying figures. FIG. 1A shows a cross section through a laminated pane, FIG.

1 B is a plan view of an inner pane with an opening,

2 shows a cross section through a first exemplary embodiment of the pane arrangement according to the invention,

3 is a plan view of two superimposed current busbars,

4 shows a cross section through a second exemplary embodiment of the pane arrangement according to the invention,

5 shows a flow chart of an embodiment of the method according to the invention. Referring first to Figures 1A and 1B, each of which schematically illustrates a laminated pane, here for example a laminated vehicle pane 2, of the pane arrangement 1 of the invention shown in Figure 2. The

Vehicle window 2 is for example the windshield of a passenger car and is formed as a laminated glass of an outer pane 3 and an inner pane 4, which are interconnected via a thermoplastic intermediate layer 5. The outer pane 3 and the inner pane 4 consist for example of soda-lime glass and have a thickness of, for example, 2.1 mm. The intermediate layer 5 is formed for example of a PVB film with a thickness of for example 0.76 mm.

On the thermoplastic intermediate layer 5 facing surface III of

Inner pane 4 is an electrically conductive coating 6 applied, which serves for example as a heating layer for active heating of the laminated vehicle window 2 here. The coating 6 is, for example, a stack of several layers containing three conductive silver layers separated by a plurality of dielectric layers. The coating 6 is transparent, so that the view through the laminated vehicle window 2 is not impaired to an extent that the

Vehicle window 2 would make unsuitable as a windshield. On the

Coating 6 are applied to their electrical contacting two current busbars 7, 8. The two current busbars 7, 8 are each formed as an approximately 5 mm wide strip of a printed and baked screen printing paste with silver particles and glass frits. The first busbar 7 is arranged along and in the vicinity of the upper edge of the vehicle window 2, the second busbar 8 along and in the vicinity of the lower edge of the vehicle window 2. In installation position of the vehicle window 2, the upper edge facing upward (roof edge) and the lower edge downwards to the ground (engine edge).

The two current busbars 7, 8 are each electrically contacted by an electrical connector 9, whereby an electrical connection to the two poles of an external voltage source is realized. The electrical connector 9 is shown in Figure 2 and will be explained in more detail below. The disk assembly 1 includes, for example, two electrical connectors 9, each having an electrical connector 9 a

Current busbar 7 or 8 electrically contacted.

By the two current busbars 7, 8, the current is not punctiform, but distributed over the width of the current busbars 7.8 introduced into the coating 6. The current flows through the coating 6 in the region between the two current bus bars 7, 8, whereby this area is heated and a heating field is formed, which covers the central viewing area of the vehicle window 2. The viewing area can be easily removed if necessary from icing or moisture. The two current busbars 7, 8 are each covered by an opaque cover printing, which is in the form of masking strips 10, outwardly. The coating 6 is applied over the entire surface of the surface III, with the exception of a peripheral edge region with a width of for example 10 mm.

As illustrated in FIG. 1B, the inner pane 4 has an opening 11, through which a current busbar 7, 8, here for example the first current busbar 7, can be electrically contacted. Although not shown in FIG. 1B, for an electrical contacting of the second current busbar 8 a corresponding opening 11 is formed in the inner pane 4 above the second current busbar 8, so that the inner pane 4 has a total of two openings 11. The opening 1 1 is formed here, for example, in the disk plane around, wherein a different shape is equally possible.

It is now considered Figure 2, wherein a first embodiment of the disc assembly 1 according to the invention is illustrated. The disk assembly 1 is shown in cross-section perpendicular to the disk plane. In particular, the outer pane 3 and the inner pane 4 connected by the thermoplastic intermediate layer 5, which has the opening 11, can be seen. The first current busbar 7 is arranged between the thermoplastic intermediate layer 5 and the inner pane 4 and thus directly adjoins side III of the inner pane 4. Through the opening 1 1, the first current busbar 7 is exposed in a contact portion 12 for the electrical contacting, d. h., Through the opening 1 1, the contact portion 12 is freely accessible. The contact section 12 results from the area of the first current busbar 7 which has been exposed through the opening 11.

The electrical connector 9 is used for electrical contacting of the first busbar 7 and connection to a pole of a voltage source (not shown). The electrical connector 9 comprises a first connector piece 13 and a second one

Connector piece 14, which are formed as rigid moldings and mechanically connected to each other. The two connector pieces 13, 14 are formed here, for example, as a coaxial connector parts and each have a rotationally symmetrical shape.

The first connector piece 13 comprises an inner part 15 with an elongate middle section 16, on which a contact element 17 for electrical contacting of the contact section 12 is mounted. The here formed, for example in the form of a contact pin contact element 17 is axially displaceably mounted on the central portion, wherein the contact element 17 against the spring force of a spring (not shown) in the middle section 16th

is inserted and thereby spring loaded. The contact element 17 is made of a electrically conductive material, in particular a metallic material, shaped and electrically connected to an inner conductor (not shown) of a cable 19 attached to the first connector piece 13. The inner conductor is connected to a pole of a voltage source

connected (not shown). The first connector piece 13 further comprises a cylindrical outer sleeve 18 having on both sides a sliding guide 20 for respective ones

Gleitnasen 21 of the second connector piece 14 has.

The second connector piece 14 comprises a cylindrical inner sleeve 22, which defines a cavity 28 for receiving the inner part 15 of the first connector piece 13 and in particular of the contact element 17. On the outside of the inner sleeve 22, the two sliding lugs 21 project radially in front. It is understood that the sliding lugs 21 are not formed circumferentially. Further, the inner sleeve 22 has a rohrstutzenformigen section or pipe socket 25 which is inserted into the opening 1 1 of the inner pane 4. Of the

Pipe socket 25 is the wall of the opening 1 1 and extends approximately to the first current busbar. 7

The second connector piece 14 further comprises a flange portion 23, which faces away from the thermoplastic intermediate layer 5 by an adhesive tape 24

Surface (page IV) of the inner pane 4 is attached. The second connector piece 14 is fixedly connected to the inner pane 4, wherein the adhesive tape may allow a non-destructive detachment of the second connector piece 14 from the inner pane 4.

For a mechanical connection of the two connector pieces 13, 14, the outer sleeve 18 is inserted over the inner sleeve 22, wherein the inner part 15 is inserted into the cavity 28. By a shoulder 26 of the inner part 15 and formed in a corresponding fit counter-shoulder 27 of the inner sleeve 22 a simple centering is possible. Here, the slide lugs 21 are guided in the respective sliding guides 20 to a respective (not shown) latching position. The two connector pieces 13, 14 are according to the shape of the sliding guides 20 when nesting

twisted against each other. The sliding lugs 21 and sliding guides 20 form one

Bayonet.

When nesting of the two connector pieces 13, 14, the contact element 17 comes into abutment against the contact portion 12 of the first current busbar 7 (contact contact) and connects the contact portion 12 to the pole of the voltage source. In this case, the contact element 17 by axial displacement in the middle section 16 in spring-loaded, so that the mechanical connection of the two connector pieces 13, 14 is spring-locked in the locking position. The bayonet lock can be released again in a corresponding manner to separate the two connector pieces 13, 14 from each other. To connect the two current busbars 7, 8 with the two poles of the voltage source, the disc assembly 1 has two electrical connectors 9, which are each arranged on a separate opening 1 1 of the inner disc on the respective current busbars 7 and 8 respectively. Reference is now made to Figures 3 and 4, wherein a second embodiment of the disc assembly 1 according to the invention is illustrated. In order to avoid unnecessary repetition, essentially only the differences from the first exemplary embodiment are explained, and otherwise reference is made to the statements there. In FIGS. 3 and 4, identical or equivalent elements are designated by the same reference numerals as in the first embodiment.

As shown in Fig. 3, for the second embodiment, there are provided two current bus bars 7, 8 having an area in which they are superimposed (hereinafter referred to as an overlap area 29 for ease of reference). The overlap region 29 results from the projection (perpendicular to the

Disk plane) of a Stromomsischischiene on the other Stromomsammeischiene. The two current busbars 7, 8 are electrically separated from each other by an insulating layer 30 (shown in FIG. 4) in the overlap region 29. In the present example, the second current busbar 8 lies above the first current busbar 7 and crosses it.

As can clearly be seen in the plan view of FIG. 3, the overlap region 29 has a recess 31 in which the current busbar lying below the upper current busbar is uncovered. In the present embodiment, to expose the first current busbar 7 in the overlap region 29 in the recess 31, the second

Current busbar 8 and the insulating layer 30 is removed. The recess 31 has here, for example, a round shape, which is particularly suitable for the use of the electrical connector 9 of Figure 4. In principle, however, any other suitable form is equally possible. It is now considered Figure 4, wherein the disc assembly 1 is illustrated with an overlap region 29 having current bus bars 7, 8.

Shown are in particular the superimposed in the overlap region 29

Current busbars 7, 8, which are electrically separated from each other by the insulating layer 30, here for example a polyimide layer. The projection (perpendicular to the plane of the pane) of the opening 11 onto the overlap area 29 corresponds at least to a part of the overlap area 29. The recess 31, through which the lower, here first current busbar 7, is exposed, is located below the opening 31 The projection (perpendicular to the plane of the pane) of the opening 11 onto the recess 31 corresponds to the recess 31.

The (upper) second current busbar 8 is adjacent to that of the intermediate layer 5

facing surface III of the inner pane 4 at. Through the opening 1 1 of the inner pane 4, the second current busbar 8 is exposed in a contact portion 12 'to the electrical contacting, d. h., Through the opening 1 1, the contact portion 12 'freely accessible. As a contact portion 12 ', that portion of the second

Stromomsischiene 8 are exposed, which is exposed through the opening 1 1. Further, through the opening 1 1 of the inner pane 4 and the recess 31, the first current busbar 7 is exposed in a contact portion 12 for the electrical contacting, d. h., Through the opening 1 1 and the recess 31, the contact portion 12 is freely accessible. As a contact portion 12 of that portion of the first Stromomsammeischiene 7 can be considered, which is exposed through the opening 1 1 and the recess 31 together.

In this embodiment, the electrical connector 9 is for electrical

Contacting of the first current busbar 7 with the one pole of the voltage source and the electrical contacting of the second current busbar 8 with the other pole of the voltage source. In this respect, only a single electrical connector 9 is required for contacting the current busbars 7, 8 with opposite polarity.

The first connector piece 13 comprises an inner part 15 with an elongate middle section 16, on which the contact element 17 for the electrical contacting of the contact section 12 of the first current busbar 7 is mounted axially displaceable against a spring force. The first connector piece 13 further comprises an outer sleeve 18, which on its Outside radially projecting sliding lugs 21 carries. The outer sleeve 18 is at least partially made of an electrically conductive, in particular metallic, material. The inner part 15 is arranged at a distance from the outer sleeve 18 and consists of an electrically insulating material in order to provide good electrical insulation to the outer sleeve 18

guarantee. The cable 19 is here a coaxial cable, wherein the one of the pole of the voltage source connectable or connected inner conductor is electrically connected to the contact element 17, while the connectable to the other pole of the voltage source or connected outer conductor to the electrically conductive material of

Outer sleeve 18 is electrically connected.

The second connector piece 14 comprises a cylindrical inner sleeve 22, which defines a cavity 28 for receiving the inner part 15 of the first connector piece 13 and in particular of the contact element 17. On the inside of the inner sleeve 22 are respective

Slideways 20 formed for the sliding lugs 21. The flange portion 23 is fixed by an adhesive tape 24 on the side facing away from the thermoplastic intermediate layer 5 surface (side IV) of the inner pane 4. The inner sleeve 22, in particular the second connector piece 14, consists at least partially, in particular completely, of an electrically conductive material, for example a metallic material. The pipe socket-shaped portion or pipe socket 25 of the inner sleeve 22 is inserted into the opening 1 1 of the inner pane 4, wherein the pipe socket 25 of the wall of the opening 1 1 is present. Here comes one of the intermediate layer 5 facing lower or base surface 33 of the pipe socket 25 to rest against a spring washer 32. The spring washer 32 is the contact surface 12 'of the second current busbar 8 at. The spring washer 32 is made of an electrically conductive material, such as a metallic material. The

Spring washer 32 has a central opening through which the contact element 17 can reach through.

For a mechanical connection of the two connector pieces 13, 14, the outer sleeve 18 is inserted over the inner sleeve 22 and thereby the inner part 15 is inserted into the cavity 28. The two connector pieces 13, 14 are according to the shape of the

Slide guides 20 when nesting against each other twisted. The sliding lugs 21 and sliding guides 20 in this case form a bayonet closure. When nesting of the two connector pieces 13, 14, the contact element 17 comes to rest against the contact portion 12 of the first current busbar 7 (touch contact). In this case, the contact element 17 by axial displacement relative to the middle section 16th spring-loaded, so that the mechanical connection of the two connector pieces 13, 14 is spring-locked in the locking position. The bayonet lock can be released in a corresponding manner again to separate the two connector pieces 13, 14 from each other. When the two connector pieces 13, 14 are mechanically connected to each other, the contact element 17 is electrically connected to the contact portion 12 of the first current busbar 7, so that the contact portion 12 is electrically connected to the one pole of the voltage source. Furthermore, the outer sleeve 18 is electrically connected to the inner sleeve 20, wherein the inner sleeve 20 in turn is electrically connected via the spring washer 32 with the contact portion 12 'of the second Stromomsammeischiene 8, so that the contact portion 12' is electrically connected to the other pole of the voltage source. In order to connect the two current busbars 7, 8 with the two poles of the voltage source, thus satisfies a single opening 1 1 in the inner pane 4 and

accordingly, a single electrical connector 9.

5 shows a flow chart of an embodiment of the method according to the invention for producing the pane arrangement 1 according to the invention. The method comprises the following steps (not necessarily carried out in this order):

I: providing an outer pane, a thermoplastic intermediate layer and an inner pane, wherein the outer pane, the inner pane or the intermediate layer is provided with an electrically conductive coating,

II: connecting the electrically conductive coating to at least one electric current connection to a pole of a voltage source provided current busbar ne,

III: bonding the outer pane and the inner pane together by lamination via the intermediate layer,

IV: exposure of a contact section of the at least one current busbar for contacting it, comprising the introduction of at least one opening into the inner pane,

V: providing an electrical connector, comprising a first connector piece and a second connector piece, which are mechanically connectable to each other, wherein the first connector piece has a with the one pole of the voltage source electrically connectable contact element, VI: fixing the second connector piece in the region of the opening on the inner pane,

VII: mechanical connection of the two connector pieces, wherein the electrical connector is formed so that in the mechanically connected state of the two connector pieces, the contact element comes into abutment against the contact portion of the current busbar.

The invention provides a disc assembly with laminated disc and at least one electrical connector, through which a simple and inexpensive electrical see-contacting at least one Stromomsischiene is possible. Compared to conventional disc arrangements, the reject rate in packaging, transport and installation can be significantly reduced. The first and / or second connector piece can be replaced separately if necessary, without having to discard the complete disc assembly. These are significant advantages of the present invention.

LIST OF REFERENCE NUMBERS

1 disc arrangement

2 vehicle window

3 outer pane

4 inner pane

5 thermoplastic intermediate layer

6 electrically conductive coating

7 first current busbar

8 second current busbar

9 electrical connector

10 masking strips

1 1 opening

12,12 'contact section

13 first connector piece

14 second connector piece

15 inner part

16 middle section

17 contact element

18 outer sleeve

19 cables

20 sliding guide

21 sliding nose

22 inner sleeve

23 flange section

24 adhesive tape

25 pipe socket

26 shoulder

27 counter-shoulder

28 cavity

29 Overlap area

30 insulation layer

31 recess

32 spring washer

33 base area

Claims

claims

A disc assembly (1) comprising:

a laminated pane (2) comprising an outer pane (3) and an inner pane (4), which are connected to one another via a thermoplastic intermediate layer (5), and an electrically conductive coating (6) between the outer and inner pane at least one current busbar (7) provided for connection to one pole of a voltage source is electrically connected, the current busbar (7) having a contact section (12) for electrical contacting thereof, the inner pane (4) having at least one opening (11), wherein the contact portion (12) through the opening (1 1) is accessible,

at least one electrical connector (9), comprising a first connector piece (13) and a second connector piece (14) which can be mechanically connected to one another, wherein the first connector piece (13) has a contact element (17) which can be electrically connected to the pole of the voltage source wherein the second connector piece (14) is fastened to the inner pane (4) in the region of the opening (11), and wherein the electrical connector (9) is designed such that in the mechanically connected state of the two connector pieces (13, 14 ) the contact element (17) comes to bear against the contact portion (12) of the current busbar (7).

2. Disc arrangement (1) according to claim 1, wherein at least two current bus bars (7, 8) each have a contact portion (12, 12 ') for their electrical contacting, wherein the contact portions (12, 12') through the opening (1 1 ), wherein the contact element (17), which is electrically connectable to one pole of the voltage source, abuts against the contact section (12) of a current busbar (7) in the mechanically connected state of the two connector pieces (13, 14), and wherein the second connector piece (14) is electrically connectable to the other pole of the voltage source and the contact portion (12 ') of the other Stromomsammeischiene (8) electrically contacted.

3. A disc arrangement (1) according to claim 2, wherein the at least two Stromomsammeienen (7, 8) have a region (29) in which both Strommasischienen (7, 8) lying over each other, but electrically isolated from each other, are arranged two contact portions (12, 12 ') in this region (29) are arranged.

4. Disc arrangement (1) according to claim 3, wherein the region (29) in which both Stromomsammeischienen (7, 8) are arranged one above the other, a recess (31), in which that Stromomsammeischiene (7), of the other power busbar (8) is covered, is exposed.

5. A disc assembly (1) according to any one of claims 2 to 4, wherein the second connector piece (14) via a spring washer (32) with the contact portion (12 ') of the Stromomsammeischiene (8) is electrically connected.

6. A disc assembly (1) according to any one of claims 2 to 5, wherein the electrical connector (9) to a coaxial cable (19) connected to an inner conductor and an outer conductor, wherein the contact element (17) with one of the two conductors, such as inner conductor , electrically connected, while the second connector piece (14) with the other conductor, such as outer conductor, is electrically connected.

7. Disc arrangement (1) according to one of claims 1 to 6, wherein the two connector pieces (13, 14) are formed in the form of coaxial connector parts.

8. disc assembly (1) according to any one of claims 1 to 7, wherein the two connector pieces (13, 14) are fixedly connected together.

9. Disc arrangement (1) according to one of claims 1 to 7, wherein the two connector pieces (13, 14) are releasably connected to each other, in particular by a bayonet lock.

10. Disc arrangement (1) according to one of claims 1 to 9, wherein the contact element (17) is displaceably mounted in the first connector piece (13) against the spring force of a spring, wherein the contact element (17) in the mechanically connected state of the two connector pieces (17). 13, 14) is displaced against the spring force.

1 1. A disc assembly (1) according to any one of claims 1 to 10, wherein the second connector piece (14) has a flange portion (23) for attachment to the inner disc (4), the flange portion (23) at least partially opening (1 1). especially completely, surrounds.

12. A disc assembly (1) according to any one of claims 1 to 1 1, wherein the second connector piece (14) by an adhesive tape (24) on the inner pane (4) is attached.

13. A disc assembly (1) according to any one of claims 1 to 12, wherein the second connector piece (14) has a in the opening (1 1) inserted inserted portion (25).

14. A method for producing a disc assembly (1) according to any one of claims 1 to 13, comprising the following steps:

Providing an outer pane (3), a thermoplastic intermediate layer (5) and an inner pane (4), the outer pane (3), the inner pane (4) or the intermediate layer (5) being provided with an electrically conductive coating (6),

Connecting the electrically conductive coating (6) to at least one current busbar (7) provided for electrical connection to one pole of a voltage source,

Bonding the outer pane (3) and the inner pane (4) together by lamination over the intermediate layer (5),

Exposing a contact portion (12) of the at least one current busbar (7) for contacting, comprising the introduction of at least one opening (1 1) in the inner pane (4),

Providing an electrical connector (9) comprising a first connector piece (13) and a second connector piece (14) which are mechanically connectable to each other, the first connector piece (13) having a contact element (17) electrically connectable to the one pole of the voltage source having,

Fixing the second connector piece (14) in the region of the opening (11) on the inner pane (4),

mechanically connecting the two connector pieces (13, 14), wherein the electrical connector (9) is formed so that in the mechanically connected state of the two connector pieces (13, 14) the contact element (17) abuts against the contact portion (12) of the current (7) arrives.

15. Use of the disc assembly (1) according to one of claims 1 to 13 in means of transport for traffic on land, in the air or on water, in particular in motor vehicles and in particular as a disc arrangement with a windshield.