FR2717339A1 - Sealing of an electrical connection of a glazing. - Google Patents

Abstract

The invention relates to a glazing requiring a supply of electrical signals provided by at least one electrical connection located both outside and inside the zone delimited by a seal. The tightness of this connection and in particular the tightness of the passage from one zone to another is ensured by at least one profiled part.

Description

-1 2717339

  WATERPROOFING OF AN ELECTRICAL LINK

OF A GLAZING

  The invention relates to glazing requiring supply of electrical signals. The invention relates to

  also the device in order to obtain such glazing.

  Several types of glazing require an electrical supply. These are heated, de-icing glazing with remote-controlled optical properties or glazing having an element requiring this connection, for example a

antenna, sensors, ...

  The electrical supply usually consists of a collecting strip in electrical contact with the elements requiring this supply. It is connected at the edge of the glazing to a cable connected to a power source,

  as described for example in patent DE-36 04 437.

  The power supply is generally located in an area protected from external stress by a

seal.

  The task of the invention is to provide glazing, the electrical supply of which will be ensured by electrical connections located both outside and within the zone.

  delimited by a seal, called sealing zone.

  The invention relates to a glazing unit requiring supply of electrical signals provided by at least one electrical connection, characterized in that said connection is located both outside and inside the area delimited by a seal, the tightness of the connection and in particular the tightness of the passage from an area to

  the other being provided by at least one profiled part.

- 2- 2717339

  2 - The profiled part is advantageously obtained by

molding neck overmolding.

  The profiled niece can be molded then added and fixed on the glazing. According to an advantageous variant, it is molded onto the glazing. The molding or overmolding technique makes it possible to obtain precise dimensions, without overflow or burr, while being relatively small. Indeed, the passage from the sealing zone to the non-sealing zone is a relatively congested space. As an indication, the height available between the face of the glazing and the body bay is of the order of 4 mm. There is, moreover, in addition to the profile allowing the mounting of the glazing in the bodywork bay, a bead of adhesive ensuring the fixing of the glazing to the bay and possibly ensuring the sealing of the glazing / bay, if necessary a gasket. and the electrical network. Depending on the type of glazing, you can also find the presence of brake lights, water or gas ducts, up-down systems of a sliding window, different fasteners to fix, for example the

  mirror, wipers, etc ...

  The part of the profiled part sealing the passage from one zone to the other preferably has a relatively flat and thin surface in order to support at least part of the seal without modifying substantially the dimensions of the bodywork bay intended to receive the glazing. Its thickness is less than 2 mm up to 1 mm. His profile is

  preferably rounded to improve profile / joint adhesion.

  The material constituting the part of the profile ensuring the passage from the sealing zone to the non-sealing zone is a material compatible with the nature of the seal and which moreover allows profile / seal adhesion. A primary may possibly be provided to improve this

membership.

  According to a particularly advantageous variant, the same profiled part ensures both the tightness of the connections located outside the sealing zone and the tightness of the passage from the sealing zone to the non-sealing zone. It -3. can also be two parts whose junction is sealed. According to one aspect of the invention, the profiled part can be a kind of "cap" covering in particular the connections not protected by the seal as well as possibly the passage from one zone to the other. This cap may include at least one housing intended to receive the electrical connections. This housing can also optionally be filled with a material in order to improve the tightness of the connections, for example a material of the thermofluid adhesive type. According to an advantageous variant, the electrical connection (s) covered with said cap are supported by a base, thus making it possible both to obtain precise positioning of the connections and to overcome

  any deviation in the geometry of the glazing.

  According to another aspect of the invention, the profiled part has other functions than those inherent in the sealing of electrical connections. This part can in particular be provided with a means in order to facilitate the mounting of the glazing in the bay. This means can for example be a lip extending beyond the periphery of the glazing and allowing centering and holding of the glazing during

minus the bead of glue.

  According to a particularly advantageous variant, the profiled part is molded onto the glazing, provided with at least one electrical connection. The profiled part is preferably equipped with a means to facilitate the mounting of the glazing in the bodywork bay, while ensuring the tightness of the passage of at least one electrical connection from the sealing zone to the non-sealing zone. The electrical connections not protected by the seal are, according to a particularly advantageous embodiment of the invention, embedded in said profiled part which is itself provided with a

  means of mounting the glazing in the bay.

  The space requirement on the glazing is thereby reduced.

  Furthermore, a single operation makes it possible to obtain both a mounting joint and the sealing of at least one electrical connection and in particular the sealing of the passage from one zone to the other. The invention also relates to the device for overmolding the glazing on which is arranged at least one

electrical connection.

  In a conventional overmolding device, the tightness of the mold must be ensured at three points: the joint plane,

  the lower and upper face of the glass sheet.

  Usually, a movable block is used to seal the upper face of the glass sheet, the latter being able to absorb any differences in geometry of the

  glazing. Joints are placed at these three points.

  However, the presence of electrical connection on the glazing

  changes the sealing system.

  According to the invention, the seal bypasses the electrical connection ensuring the passage from one zone to another, the movable block being machined so that the connection

  mold / glass sheet is moved.

  According to a preferred embodiment, the profiled part ensuring the tightness of the passage of the connection from one zone to the other is obtained by means of an "organized" leak from the mold cavity. This device makes it possible to obtain the profiled part according to the invention without substantially modifying the overmolding or encapsulation tool which is a tool.

relatively expensive.

  As for the electrical connections, they are chosen independently of one another or in combination, from the following group: conductive layer, foil, bakelite plate, conductive filaments in the form of wire (s) or

  braid (s), copper bar (s), electrical connection.

  The electrical connection (s) ensuring the passage from one zone to another are chosen independently of each other or in combination in the following group: conductive layer, bakelite plate, tinsel, barrette in

  copper, solder type electrical connection.

  The electrical connections are temporarily kept in position for the time necessary for overmolding by any suitable means, glue, jumpers, rivets, adhesive layer, etc. The connection advantageously includes projections so

  to delimit the space necessary for this fixing.

  According to an advantageous variant, a U-shaped jumper is used to maintain the electrical connection at least temporarily, when it is in particular conductive filaments or a connection, for example of the domino type or of the female and male plug type. The length of the branch of the U makes it possible to position said connection well, a fastening system being also provided for fixing the connection on

the edge of the glazing.

  According to another advantageous variant, the electrical connections in particular of the conductive filament type in the form of wires are maintained, at least temporarily, by an adhesive tape comprising on each of its faces an adhesive layer. The space requirement at the edge of the glazing is therefore reduced. Other advantages and features will appear in

  the following description with reference to the appended figures in

  which: * FIG. 1 represents different trajectories of electrical connections according to the invention, * FIG. 2 represents a more detailed view of the passage from the sealing zone to the non-sealing zone, * FIG. 3 represents variants of profiles hat-shaped, cut; * Figure 4 shows profiled parts according to the invention, the connections being supported by bases, in section, * Figure 5 shows two front views of a connection according to the invention, * Figure 6 shows a section of 'a variant of the ir.vention, * Figure 7 shows a front view of a glazing

of the invention.

  Figure 1 illustrates different paths that can follow the electrical connections 1, on a glazing 2 of the invention. Of course, these trajectories are given without limitation. The connection can consist of the following elements, taken independently or in combination: a metallic foil, a conductive layer, at least one conductive filament, a bakelite plate, a 6 - copper strip or an electrical connection of the domino type,

  plugging in of plugs, soldering, etc.

  The diagram la represents a glazing 2 whose electrical connections 1 are located outside the zone delimited by a seal 3. The diagram represents it for example the supply of electrical signals to an element 4 by means of a source d food schematically in 5. This element can

  be a brake light, a sensor, a hologram, etc.

  Diagram lb illustrates a heated windshield. The heating network consists of fine wires of electrical heating resistance 6. Each heating wire is electrically connected to two collecting strips 7 and 8. The collecting strips are for example made up of strips of copper foil covered with tin solder to low melting point. According to this diagram, the collector strips are located in the sealing zone. Connections 9 seal the passage from the sealing zone to the non-sealing zone. These collecting strips 7 and 8 and the connections 9 constitute the electrical connections 1 of the heating network to a power source

electric, not shown.

  The diagrams lc and ld illustrate the passage of the links

  from the sealing zone to the non-sealing zone.

  Diagram lc represents the supply of an element 10 situated in the sealing zone to a power source 11, also situated in the sealing zone. For reasons of space, the electrical connection 1 is located mainly outside the sealing zone while ensuring the passage from one zone to another. Element 10 can be a

  signaling, such as a brake light, a hologram, a sensor, ...

  The diagram ld illustrates a heated rear window consisting of fine wires of electrical resistance 12 electrically connected to two collector strips. These constitute the electrical connections 1 of the heating network to an external power source, not shown. According to this diagram, the collecting strips consist firstly of a silver paste 12, deposited by screen printing, and secondly of conductive filaments under

  shape of flat braid or wire 15, 16 respectively.

  ? 7- In this figure 1 the profiled parts are not shown. FIG. 2 shows in more detail the passage from the sealing zone to the non-sealing zone delimited by the presence of the sealing joint 3. A profiled part 17 seals this passage. The profiled part 17 is obtained

  advantageously by molding or, preferably, by overmolding.

  The profiled part 18 seals the connections located outside the sealing zone. Exhibits 17 and 18

  can be the same piece, as shown.

  Figure 3 illustrates different parts profiled in

  hat shape, without limitation.

  The profiled part 19 can be parallelepiped, ellipsoidal or provided with lips 20 as illustrated in diagrams 3a, 3b, 3c and 3d respectively. The electrical connections 1 are here represented in the form of wires, diagrams 3a, 3b and 3c or flat braids, diagram 3d. According to these diagrams, the profiled parts are overmolded. We can also consider housing in which the electrical connections are located as shown in the diagrams 3e

and 3f, without limitation.

  The electrical connections can also be conductive layers 21 as illustrated in diagrams 3g, 3h, 3i and 3j, without implied limitation. These layers can be a

  agent paste deposited by screen printing or a conductive coating.

  According to diagrams 3i and 3j, the conductive layers 21 are

housed in accommodation.

  Figure 4 shows different types of bases, without limitation. The profiled part 19 is fixed on a base 22. This base can include lugs 23

  intended to cooperate with the pins 24 of the part 19.

  The base is shown here glued using a layer

adhesive 25.

  The presence of the base makes it possible to overcome deviations in the geometry of the glazing as well as deviations from

  dimensions relating to the electrical connection.

  FIG. 5 shows in more detail a type of electrical connection at the level of the passage from the sealing zone to the

non-sealing area.

  -8 When the electrical connections are conductive filaments, the latter are not suitable for passing from one zone to another. Indeed, they generally have a relatively large thickness. In addition, their relatively narrow contact surface with the glazing leads to a risk of incorrect positioning which can in particular alter

  sealing the passage from one zone to another.

  This is why, it is preferable that the connection at the level of said passage is thin. It is for example a conductive layer, a foil, a copper strip or a bakelite plate, of the type of those

  used in printed circuits.

  Diagram 5a represents an electrical connection consisting of a silver-based paste 26 deposited for example by screen printing. The wires 27 are for example connected by

silver paste solder.

  Diagram 5b represents an electrical connection made up of a silver-based paste 28 onto which metallic foils 29 are welded, the wires 27 being electrically connected to this assembly. This device makes it possible in particular to increase the electrical power at the level of the link.

  ensuring the passage from one zone to another.

  FIG. 6 represents an advantageous variant of the invention. The profiled part 30 forms a lip 31

  to facilitate the mounting of the glazing in the bay 32.

  The connection here consists of conductive wires 33 connected via a domino 34 to a bakelite wafer, of the type used for printed circuits 35. Due to the small thickness of the wafer, the latter ensures the electrical connection from one zone to another. A jumper 36 optionally temporarily ensures both the fixing and the correct positioning of the domino 34. The part 37 of the profiled part is advantageously obtained by means of an organized leak of the plastic material constituting the profile 30. The profiled part 30 is preferably obtained by overmolding. Profile part 30

  surrounds the glazing on at least part of its periphery.

  It can be fitted with links 1 over part of its periphery or over its entire periphery. The connections are shown here on the edge of the glazing. They can also be on the edge and / or on at least one face of the glazing. It can also be a flat braid. They can also be maintained, at least temporarily, on the glazing using an adhesive tape comprising on

  each of its faces an adhesive layer.

  FIG. 7 represents another variant of the invention according to which the electrical connection 1 consists only of a collecting strip based on silver paste deposited by screen printing. This strip ensures the electrical supply of the element 38 by connecting it to a power source not shown. The collector strip is located both outside and inside the sealing zone delimited by the joint 3, while ensuring the passage from one zone to the other. A profiled part 39 provides part of the sealing of this strip. It preferably has means to facilitate mounting of the glazing in the bodywork bay, in particular a lip 31, as shown in FIG. 5. The header strip can be completely protected from external stresses by the part 39. It can also, as shown, overflow from the room. The protruding part can then be covered with a coating ensuring its sealing. It is an essentially organic coating, based on a polymer or a copolymer based on a resin of the polyurethane, acrylic or cationic type. This coating is for example that described in the

  patent application FR 93/09595 not yet published.

Claims (17)

  1. Glazing requiring an electrical signal supply provided by at least one electrical connection (1, 7, 8, 9, 13, 14, 15, 16, 21, 26, 27, 28, 29, 33, 35), characterized in that said electrical connection is located both outside and inside the area delimited by a seal (3), the sealing of the connection and in particular the sealing of the passage of an area   to the other being provided by at least one profiled part (17, 18, 19, 30, 39).   2. Glazing according to claim 1, characterized in that the part   profiled is obtained by molding or overmolding.   3. Glazing according to claim 1, characterized in that the profiled part is a "cap" (19) covering at least partially a electrical connection.   4. Glazing according to claim 3, characterized in that the connection   electric covered by the profiled part is supported by a base (22).   5. Glazing according to claim 1, characterized in that the part of the profiled part ensuring the passage from one zone to the other (17, 19, 37) has a thickness less than 2 mm.   6. Glazing according to claim 5, characterized in that the electrical connection (s) are chosen independently of one another or in combination, from the following group: conductive layer, foil, Bakelite wafer , copper strip, conductive filaments in the form of wire (s) or   braid (s), electrical connection.   7. Glazing according to claim 6, characterized in that the electrical connection (s) ensuring the passage from one zone to the other (9, 21, 26, 28, 29.35) are chosen ( s) in the following group: conductive layer, foil, Bakelite plate, copper strip or electrical connection of the solder type. 8. Glazing according to claim 6 or 7, characterized in that the electrical connections consist of conductive filaments in the form of wire (s) or braid (33) connected using a domino (34) to a plate in   BakÈlite (35), said plate provides electrical connection from one zone to another.   9. Glazing according to claim 6 or 7, characterized in that the electrical connections consist of conductive filaments in the form of wire (s) (27) electrically connected to a silver paste (26, 28)   possibly coated with foil (s) (29).   10. Glazing according to claim 6 or 7, characterized in that an electrical connection ensuring the electrical supply of an element (4, 10, 38) consists only of a silver paste deposited by screen printing. 1 1. Glazing according to claim 10, characterized in that a part of the silver paste located outside the sealing zone is covered by a   essentially organic coating ensuring its sealing.   12. Glazing according to claim 6 or 7, characterized in that at least   a link is equipped with jump (s).   13. Glazing according to claim 1, characterized in that at least one electrical connection is maintained at least temporarily on the glazing using a jumper fixing on the edge of the glazing or a ribbon comprising on   each of its faces an adhesive layer (25).   14. Glazing according to one of the preceding claims, characterized in   that the same profiled part seals both at least one electrical connection located outside the sealing area and the sealing of at least   an electrical connection allowing passage from one zone to another.   15. Glazing according to claim 14, characterized in that the profiled part has other functions than those inherent in the sealing of a electrical connection.   16. Glazing according to claim 15, characterized in that the profiled part is equipped with a means to facilitate mounting of the glazing in the opening.   17. Glazing according to one of claims 14 to 16, characterized in that   that the profiled part is obtained by overmolding the glazing.   18. Device for manufacturing a glazing unit according to claim 17, characterized in that the part of the profiled part ensuring the sealing (17, 1 9, 37) from one zone to the other is obtained from a leak in the mold.   19. Device according to claim 18, characterized in that the seal ensuring the tightness of the mold bypasses the electrical connection ensuring the passage from one zone to another.