KR100762823B1 - Solderable electrical connection element with a solder deposit and window pane with the connection element - Google Patents

Abstract

According to the invention, a metal insert piece 6 is provided in a solderable electrical connection element 1 with a thin support sheet 2, said support sheet 2. Comprises at least one metal conductor 3 and at least one free contact face 5. The free contact surface 5 can be connected to the mating connection surface 11 of the other component 12 by a soldered joint that can be made using a solder deposit 9. The metal insert piece 6 here penetrates the connecting element 1 and the support sheet 2 respectively in the region of the contact surface 5 and is firmly connected to the support sheet. Preferably, the insert piece 6 can be obtained from a conventional crimp attachment, which also has a solder deposit 9 and an electrical conductor on the support sheet 2. Can be used when attaching

Description

Solderable ELECTRICAL CONNECTION ELEMENT WITH A SOLDER DEPOSIT AND WINDOW PANE WITH THE CONNECTION ELEMENT

1 is a perspective view of a bipolar contact zone in which the insert piece is provided in two successive steps to secure the insert piece in which the solder deposit is soldered to the insert piece itself;

FIG. 2 shows a second embodiment in which the solder deposit is cold-pressed by the insertion piece over the contact surface of the unipolar contact zone.

FIG. 3 is a cross sectional view showing a completed solder unipolar contact area between a connecting window and a window pane provided with a corresponding connection surface; FIG.

FIG. 4 is a cross-sectional view of a variant similar to FIG. 3 in which the conductor is stripped off at the end and is joined to the support sheet and the solder deposit by means of an insertion piece.

<Explanation of symbols for main parts of the drawings>

1: connection element 2: support sheet

3: conducting track 4: contact zone

5: contact face 6: insertion piece

7: tooth 8: core

9: solder deposit 10: solder wire

The present invention relates to a solderable electrical connection element having the features of the preamble of claim 1.

Document DE-C1-195 36 131 discloses a solderable connection element for an antenna pane, in which several free contact surfaces which are insulated from one another and their conducting tracks are heat-resistant. It is connected to a support sheet with resistant, non-conducting, and the upper sheet layer extends over the contact surface and the soldering point, respectively. The ends and free contact surfaces of the conductors to be soldered are provided with solder deposits soldered to their bottoms or connections, respectively. These solder deposits are remelted by providing heat where actual welded joints are made and are permanently connected to the joined joint surfaces by pressing the solder deposits over the joint surfaces. There is no separate piece provided to ensure the reproducible thickness of the solder layer. Currently, systems based on providing finely metered amounts of solder to ensure that the soldered joints are formed to a sufficiently uniform thickness and surface distribution during melting and compression are achieved and systems based on precisely crafted soldering and soldering methods It is used at large expense.

In industrial mass production, a very short time is required for each soldering operation during soldering of these connecting elements, during which the heat required must be passed through the support sheet to the pre-tinned contact surface. In order to optimize heat transfer in the presence of strong temperature attenuation, it is necessary to ensure as large a heat supply as possible through special tools. Likewise, the temperature of the tool must be sufficiently higher than the melting point of the solder. Again, for this reason, the support sheet must be made of a heat-resistant material (usually polyimide or Kapton), which has a small fraction of its total area, although its heat resistance is actually Although only required, it is a fairly expensive material compared to other plastics.

Another problem is contact reliability, which can be checked only after expensive joints have been made, for example X-ray inspection.

In the prior art, at least one narrow adhesive tape is provided on the side of the contact area facing the corresponding connection area on the pane, which extends linearly to the conducting track with a relatively small width. Thus, the connecting element can be located in the window pane and temporarily fixed. In addition, the adhesive tape serves to relieve the tensile force in the actual contact area. If desired, the tape can also be wound completely around the contact area in the form of a ring to protect the contact area extensively from environmental influences (moisture, dirt).

Document DE-C2-43 04 788 discloses a prefabricated laminated component consisting of a thin metal strip and an insulating coating surrounding the strip consisting of thin layers of plastic sheet. This connecting element, also called a flat conductor, is locally provided with holes having the same axis in the two layers of the insulating coating and the metal layer, which form a contact window. Molten solder can be introduced into the hole, whereby the metal strip is firmly connected, for example, onto an electrical conductor mounted on the pane. This construction of the contact window can also be used as an observation window, allowing simple visual inspection of the soldering point. This connecting element may also be adhesively bonded to the surface of the pane.

Finally, on the one hand, for example to securely connect the end plug or electrical switching elements to the conducting track, on the other hand the end plug or the electrical It is known to provide crimp connectors for these planar conductors for electrically connecting the switch elements. A metal insert piece is placed over the sheet which is actually U-shaped in cross section and has a branch at the toothed free ends. The teeth are pierced through the seat and the conducting track in such a way as to be contacted with the tip of the knife, as appropriately by squeezing or force by manual or mechanical mechanism. It is then bent to the side to form a joint that is mechanically engaged and electrically conductive. In general, when bonded to the above-mentioned plastically deformable U-shaped areas, they contact tabs or bars or other soldering surfaces.

It is an object of the present invention to provide another solution for forming solder deposits on solderable electrical connection elements of the type mentioned in the introduction.

According to the invention this object is achieved by the features of claim 1. The features of the second group claims provide an advantageous improvement on this object. Claim 11 provides an improvement described in the second group claims 12 and 13 for window panes with the preferential use of at least one connecting element according to the invention.

If a metal insert piece that is tightly coupled with the support sheet and penetrates the support sheet is provided in the area of the contact point where the solder deposit is provided, this piece forms a better base in several respects for the formation of the solder deposit. For example, a large amount of solder is soldered to the insert piece according to the first variant, so that solder deposits are formed, or according to the second variant, the solder deposit is fixed by merely mechanically coupling to the support sheet at the same time as the insert piece. It is no longer necessary to heat either the element itself or the support sheet.

Particularly preferably, it is necessary to provide either direct contact or direct connection of the solder deposit to the contact surface of the connecting element in order to prevent the occurrence of multiple transition resistances. Direct contact of the insert piece metal with the stripped end of the conducting track or cable is not necessary. The contact surface is soldered directly to the corresponding connection surface of the electrically connected component, for example an antenna pane or a heating pane.

However, although the solder deposits are only connected to the insertion piece and, of course, to the respective corresponding mating surfaces later, there is also another variant of selectively inserting the insertion piece into an electrical contact each having a conductor. In this case, the portion of the insertion piece in which the solder deposit is provided forms the contact surface of each conductor.

The electrical conductor may have the shape of a conductive track connected flat to the support sheet or embedded in the support sheet and / or at least mechanically connected to the support sheet. In the case of a cable, the contact surface can be appropriately formed by removing the insulation of the cable end. Several cables brought in in this way can also be advantageously maintained in a predetermined spatial arrangement in a very simple manner on the support sheets of the connecting elements, in particular advantageously.

It goes without saying that the various arrangements for the electrical conductors and their contact surfaces can also be connected on or together as a single support sheet. Thus, for example, additional conductors (cables) can also be placed on the connection elements, usually with a predetermined number of conducting tracks, where necessary. Each conductor will in principle be insulated from each other. However, if a corresponding need arises, it is additionally possible to bring the cable to be connected in electrical contact with the corresponding connected connection surface which is connected to an already existing conducting track.                     

In a more preferred embodiment, the insertion piece is formed such that the free end of the serrated branch has a substantially U-shaped cross section before it is connected to the connection element, the tooth of the insertion piece being pressed or pressed to penetrate the connection element and then calcined. It is bent laterally by plastic deformation. Of course, it is also possible to consider inserts of different shapes. However, the preferred shape here ensures that the best results are obtained in terms of possible mechanical processes and their cost effectiveness.

As an additional advantage, the insert piece allows to provide a significantly better heat supply to the solder deposit while continuously soldering the contact surface to the corresponding connection surface. Since the insertion piece penetrates the connecting element, one of the sides of the insertion piece remains free after the contact surface is placed on the base or the solder deposit is placed and can be used to heat the actual soldering point. If the metal conducts heat much better than plastic, this results in a noticeable improvement in heat transfer from the solder to the solder deposit. Where appropriate, the heat supply can be changed from flat to soldering iron or laser. This significantly reduces the time required for soldering operations. The temperature of the tool may be lowered. In addition, plastics with possibly low heat resistance and consequently less expensiveness can be used as support sheets. Finally, the thermal load around the solder point is reduced.

In addition, another advantage of the metal insertion bias is its role as a spacer. The fact that the insert piece or its raised teeth are permanently held at a predetermined height above the contact surface advantageously fully compensates for the insignificant disadvantage of having a thicker thickness than the contact area of the conventionally known flat cable connection element. Also remains. The space created here can be filled with solder deposits with sufficient reliability and at the same time tightly bonded so that the solder material no longer causes lateral expulsion while molten in normal applications. Thus, improvements in soldered joints in quality are also expected. The more significant importance of preventing the side draining of the solder is that the risk of shorting by the drained solder is significantly reduced, so that the spacing with neighboring contact surfaces can be narrower than in the prior art.

In addition, another advantage of forming a solder deposit directly on the conducting track is the inherent mechanical rigidity of the insertion piece. If any force is applied on the connecting element, the brazed joint made of the insert piece will be more difficult to break than those without the insert piece, so providing additional defenses such as adhesive tape may be unnecessary.

Likewise, in accordance with improvements and as in the prior art, adhesively bonded joints may also be provided in the contact area between the connecting element and the other components according to the invention, for example to protect the soldering point from the effects of moisture or contamination. Can be.

 Although the thickness of the connecting element according to the invention is slightly thicker in the contact area, the connecting element according to the invention can be used on a free surface of a unitary window pane as well as placed in a laminated pane. It can also be used on window surfaces. In addition, the adhesive film commonly used in laminates is much thicker than the contact area and can encapsulate the contact area without any difficulty.

Of course, however, the application of the connection elements described herein is not limited to the electrical connection of window panes.

As a whole and whatever the application envisioned, the fitting of the connecting element by the insertion piece in connection with the formation of the solder deposit can be extensively mechanized, such as the production of the actual soldered joint using the insertion-side spacer function.

Further details and advantages of the present subject matter will become apparent from the drawings of the embodiments described first and from the detailed description given below.

The drawings herein are simplified and greatly expanded.

<Example>

According to FIG. 1, the connecting element 1 consists of a laminated support sheet 2 comprising an upper layer 2.1 and a lower layer 2.2, between the upper and lower layers. There are housed two parallel metal strips which constitute a conductive track 3 which is electrically insulated from each other. In the contact area 4 the conducting track 3 is stripped off by the lower layer 2.2 of the support sheet being removed locally, which makes it possible for the contact surface 5 to be located at this point. The insertion piece 6 is provided in the same contact area, which is made in the form of a crimp, initially having a U-shaped cross section with a branch having a serrated end.

The two parallel rows of teeth 7 of the insertion piece 6 first penetrate the connecting element 1 in such a way as to completely penetrate the support sheet 2 on either side of each conducting track 3 (Fig. Left side of 1), and then they are lifted laterally from each other by a suitable tool (right side of Figure 1). They can also penetrate or contact the conducting track itself. However, this is not necessary from a functional point of view, unlike conventional crimp connections, since there is no need for direct electrical contact between the insertion piece and the conducting track. The pressing direction is directed such that the tooth 7 exits the side of the contact area and bends towards each contact surface 5. As a result, the contact surface 5 is firmly sealed by the respective insertion piece 6 between the bent teeth 7 of the insertion piece 6, that is, between the branch and the core 8 of the initial U-shaped cross section. Lose. On the surface of the upper layer 2.1 of the support sheet 2 lying on the opposite side of the contact surface 5, the core 8 is placed with a free outer surface. This is also usually different from standard crimp connections. If the teeth themselves do not penetrate the conducting tracks, the cores are pressed against the stripped portion of each conducting track to ensure a good current flow as possible, resulting in a slight flattening.

The length of the teeth 7 of the insertion piece 6 should be adapted to the requirements. The teeth on the standard crimp attachment are longer than the teeth in this description. In the longitudinal direction of the felling track, the ends of the teeth may be folded and overlapped. In such a case, it may be advantageous that the two rows of teeth deviate from each other in the longitudinal direction.                     

 In the next step, after the tooth (7) is bent up, the solder deposit (9) is now removed from the toothed side of the insertion piece (6) in such a way that the solder wets not only the tooth (7) but also the contact surface (5). Was achieved. The amount of solder used is sufficient to cause the solder to swell again slightly over the teeth 7. This ensures that the molten solder can make direct electrical contact between the contact surface 5 and the connection surface connected to the contact surface 5 (see FIG. 3).

For the actual size of these components the length of the insertion piece 6 made of part of the metal sheet about 0.2 mm thick in this embodiment is about 3 to 5 mm, while the conducting track is about 1.5 mm wide and the thickness It should be pointed out that is about 0.1 mm. Of course, the teeth must be long enough to penetrate and bend the support sheet.

2 shows another variant of the solder deposit 9, in which a portion of the solder wire 10 contacts the contact surface 5 on the one hand and swells slightly over the teeth 7 on the other hand. It is filled and cooled between the bent teeth 7 which are bent by a suitable tool of the insertion piece 6 in a raised manner. This variant has the advantage that the contact area 4 does not need to be preheated while the deposit is formed. Solder wires may have a tubular cross-section and may be combined with strands of flux located therein in a conventionally known manner, which facilitates subsequent soldering.

3 shows the finished solder joint between each contact surface 5 and the connection surface 11 connected to the contact surface 5 via the preferred application sketched in a simple manner in the case of the connection elements described herein. This connection surface is provided on a window pane 12 made of glass or plastic, for example connected to an antenna element or heating element 13 as shown here only. In the known method the connecting surface 11, such as an electrical element, is advantageously made from a conducting silver paste deposited by screen printing and fired red. If necessary, it can also be pretinned.

3 shows the instant when the solder deposit 9 is completely melted under the insertion piece 6 with respect to the core. Here, the end of the soldering machine 14, indicated only by a dot / dashed line, is applied to the core of the insertion piece. Obviously, the heat in the soldering machine 14 essentially passes through the metal insert piece 6 to the actual soldering point, but in practice it is faster than current soldering through the upper layer 2.1 of the sheet. At the same time, the raised tooth 7 of the metal insert piece 6 is a toothed connection between the lower side of the connecting element and the upper side or the connecting surface 11 of the window pane 12 in the contact area. Spacers are formed with respect to the face 11. This ensures that the thickness of the solder is limited within a narrow area. However, the solder may continue to flow laterally while melting through the slots between the teeth 7 and thus may enlarge the lower part of the solder joint with respect to the spacing between the ends of the teeth.

The heat may be supplied without any contact by radiation (eg, laser radiation), instead of using the soldering machine 14, in which case the pressure applied to the soldering point must be applied in another suitable way.                     

Of course, in this case, the contact region may have substantially a pair of contact surfaces and a connecting surface, unlike the present simplified description.

4 shows a variant of the connection element on a more enlarged scale, which comprises a cable 15 stripped off as an electrical conductor. Unlike FIG. 3, here the cross section is made in the longitudinal direction of the conductor. The support sheet 2 may have only one layer in the connection area for the cable 15 as shown or may be according to an embodiment according to the other figures. In this variant, the end of the cable 15 from which the insulator 16 of the cable has been peeled off should be regarded as the contact surface 5 of the conductor. The end of the stripped cable is mechanically connected by means of an insertion piece 6 to the support sheet 2 and the solder deposit 9 coupled thereto, which is made by FIGS. This figure rotated 90 degrees of the figure shows how the teeth 7 of the insertion piece 6 plastically deformed the solder deposit and also constituted a part of the solder wire. When the solder deposit 9 is melted, the material will firmly connect the connection surface 11 to the contact surface 5 as in FIG.

Finally, solder deposits are also formed on the backside of the insertion piece 6, ie on the core 8, if necessary, in contrast to the description here provided if a reliable electrical connection can be ensured simultaneously between the electrical conductor and the insertion piece. It should also be clearly pointed out. Of course, it must be crimped between the inserted one-way core and the support sheet. Again in the present variant, if the solder deposit is only mechanically glued between the support sheet 2 and the core 8, it is of course necessary that a cavity is later provided to allow the molten solder to flow to the connecting surface.

As described above, the present invention provides a metal insert piece over a solderable electrical connection element, improving cost efficiency, reducing work time, reducing heat load around the solder point, increasing mechanical stiffness of the solder joint, and shorting the solder joint. It has the effect of reducing the likelihood.

Claims (14)

Metal conductor 3 having a contact surface 5 which is provided with a solder deposit 9 and which can be connected to the connection surface 11 of the other components 12, 13 which are joined with the contact surface 5 by soldering the solder deposit. 15) and a solderable electrical connection element comprising a thin support sheet (2), Solderable, characterized in that the solder deposit 9 is provided and the insertion piece 6 penetrating the connecting element 1 is tightly coupled to the support sheet 2 in the region of the contact surface 5. Solderable electrical connection element. The solderable electrical connection element as claimed in claim 1, characterized in that the conductor has the shape of a conductive track (3) which is flatly coupled to the support sheet (2). The solderable electrical connection element as claimed in claim 1, characterized in that the conductor has the shape of a cable (15) mechanically coupled to the support sheet (2). The solderable electrical connection element according to any of the preceding claims, characterized in that the solder deposit (9) is made by a large amount of solder soldered to the insert piece (6). The solderable according to any one of claims 1 to 3, characterized in that the solder deposits (9, 10) are mechanically fixed to the support sheet (2) by the insertion piece (6). Electrical connection elements. 4. The solderable electrical component of claim 1, wherein the solder deposit 9 can be soldered directly to the contact surface 5 of the conductor 3; 15. Connection element. 4. The branch according to claim 1, wherein the insertion piece 6 has a branch with a core 8 and serrated free ends before being connected to the connecting element 1. Solderable, characterized in that it has a U-shaped cross section with), wherein the teeth 7 of the insertion piece 6 are pressed to pass through the connecting element 1 and are then bent laterally. Electrical connection elements. 8. The solder deposit according to claim 7, wherein the solder deposit 9 has a length of solder between the teeth 7 of the insertion piece 6 on the one hand and the support sheet 2 or the contact surface 5 on the other hand. A solderable electrical connection element, characterized in that it is formed by filling a soft solder wire (10). 8. The solderable electrical component of claim 7, wherein the solder deposit is formed by filling a solder wire of a predetermined length between the core on the insertion side and the support sheet or the contact surface on the one hand. Connection element. 10. The solderable electrical connection element of claim 9 wherein the core is provided with a cavity through which the molten solder can flow to the connection surface. 4. The solderable electrical connection element according to claim 1, wherein the contact region (4) comprising the contact surface (5) is provided with an adhesive portion. 5. As a window pane (12) having a solderable connection element (1) according to any of the preceding claims, The window pane is provided at its face with a connecting face 11 for an electrical element, the connecting face 11 being soldered to the contact surface 5 of the connecting element 1 by means of a solder deposit 9. Pane (12). 13. A window pane according to claim 12, characterized in that in the contact area 4 of the soldering point an adhesive bonded joint is provided between the connecting element 1 and the surface of the window pane 12. . 13. The window pane of claim 12, wherein the surface of the window pane forms an interior surface of a laminated pane.

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