DE102009002954A1 - Electrical contact for use between e.g. flexible flat cable and contact pin, has holding down clamp arranged on side, which is turned towards radiant heat coupled heat source, of contact - Google Patents

Abstract

The contact (42) has a holding down clamp (26) arranged on a side (18), which is turned towards a radiant heat coupled heat source (22), of the contact. The clamp has a trough-like depression (28), and forms an overlap (40) with an edge of a recess (44). The clamp forms a support that is smaller than a cross sectional area of the recess. The clamp has a surface coating made of silicon nitride, nickel, silver or gold, and an anti-corrosion layer. Insulation layers (14, 16) of a flexible electrical conductor support (10) are provided in the recess. An independent claim is also included for a method for producing an electrical contact.

Description

State of the art

To the Add flexible conductor carrier, so for example Flex films, FPC's (Flexible Printed Circuits or FFC's (Flexible Flat Cables) with other components, are so far solder joints or cold contacting techniques in the application. Under cold-contacting techniques For example, plug or clamp connections are understood.

Around these conductor carriers, such as Flexfolien or FPC's, by cohesive welded joints To contact, procedures and processes are necessary on In a narrow space a reproducible joint in the ensure that the carriers are addressed. Cohesive connections in a small space can be with high efficiency, for example by laser welding realize.

at the cable carriers, such as Flexfolie, FFC or FPC, which generally have very thin conductive layers, Process control is a big problem. The thin ones conductive layers are usually only a few microns to some one hundred microns thick and are preferably made of copper. The partners to be joined together are safe to each other to position. In cohesive electrical connections, which are generated by laser welding is further to ensure a gap-free support of the joining partners.

US 5,676,865 refers to a method and apparatus for making welded joints. According to this solution, a first and a second electrically conductive component are used and connected to each other by means of a radiation source. The first electrically conductive member has a higher reflectivity with respect to the radiant energy than the second electrically conductive member. For joining the two components together, an opening is produced in the first component, which extends completely through this first component. Subsequently, the first component, the second component is positioned overlapping.

EP 1 155 602 B1 refers to an electrical connection method and an electrical connection. The electrical connection point comprises a flexible printed circuit board, which is formed from two insulating layers and at least one metallic interconnect extending therebetween, and a metallic contact partner. In one of the insulation layers, a lighting opening is formed. In the other of the two insulation layers, a connection opening is formed opposite the illumination opening. A smaller in terms of its lateral dimensions than an opening width of the connection opening dimensioned connecting portion of the metallic contact partner is brought through the connection opening into contact with the metallic interconnects. By means of the laser light directed through the illumination opening, a radiation heating of the conductor track and the connecting section adjacent thereto and thereby the formation of a welded or soldered connection is brought about.

Presentation of the invention

The According to the invention proposed training a Joint, for example, to bring about a electrical contacting of a monolithic joining partner with a flex foil, allows for improved fixation and positioning the flex foil in relation to the joining partner, for example, as a pin (pin) formed joint partner. The proposed solution according to the invention allows In addition, a gap of almost zero, the very cheap for a cohesive joining process, such as the laser welding, which is also very is easy to automate, is suitable.

at the solution proposed according to the invention, or in the proposed joining method, First, a hold-down is irradiated, which as "lost Downholder "remains on the component and in addition ensures the freedom from splitting. Preferably, a metallic Downholder used on the stripped flexible cable carrier is pressed and one for the laser welding process reproducible surface for the radiation injection site having. The metallic hold-down becomes during the welding process with the conductor carrier (eg a flex conductor) and the Pin welded and preferably remains on the component, hence the term "lost hold-down".

Preferably the hold-down is executed so that he has a for the irradiation with a heat source, such as the above-mentioned laser-optimized surface, having. The geometric dimensions of the downholder made of metallic Material are preferably chosen larger as the recess in the flex foil, d. H. of the area in which the insulation layers are removed. The hold-down points above In addition, a bearing surface, which is smaller than the Recess at the top of the flex foil to be contacted electrically. However, there is also the possibility of holding down make smaller than the recess, so that an annular gap remains.

Over the support surface, a clamping force is applied in the hold-down and thus on the flex foil and in the joining partner, in a Ausfüh embodiment of the proposed solution according to the invention designed as Kontaktierungsstift (pin), derived. This ensures that the joint assembly, the metallic hold-down, the flexible electrical conductor carrier and the joining partner is clamped extensively gap-free. Furthermore, this arrangement avoids that the flex foil is directly exposed to the heat radiation of the laser and thus could be prematurely damaged.

In an advantageous embodiment of the invention proposed Solution and to simplify the handling of the blank holder this can be made of a magnetic material. In order to can be put on with a correspondingly provided Clamping device including magnet holder done. After the welding process is When removing the clamping device, the magnetic fixation of Holding down the tensioner by lifting the tensioner solved, so that the hold-down joined cohesively remains at the joint.

Preferably the hold-down is made of a material which the Conductor material and / or the joining partner material (Pin) corresponds to a metallurgically optimal in the connection zone To achieve the configuration of the connection, in particular as regards thermally generated strains. The hold down can appropriate metallic surface coatings such as tin or silver exhibit. Furthermore, the made of metallic material Hold-downs contain corrosion protection layers.

The Thickness of the blank holder with respect to the beam direction of the laser welding device is chosen so that these are preferably larger as the layer thickness of the upper insulation layer of the flex foil is. Depending on the material of the blank holder and adapted to the cohesive Joining process can be beneficial for any hold-down thickness the laser process, d. H. the cohesive joining, to be selected. If several connections are made to one component, as described above, so can in Advantageously, the individual hold-down in a hold-down composite supplied to the joints and a clamping means become. This can for example be done so that the hold-down added to the process as a punching / embossing part on a belt be and be joined there cohesively. So For example, the hold-downs can be made from a hold-down band remove what is done mechanically or by a laser process can.

A further embodiment possibility is to manufacture the joining partner (pin) from a material which is magnetizable. This allows the jig considerably be simplified when the metallic hold-down from a magnetic material and the voltage in the gap-free composite from hold-down to conductor to be contacted and pin by the magnetic force caused and maintained.

In Development of the invention proposed Solution can be a contacting of punched bars or other Conductor carriers with a Flexfolie or FPC done. As part of the contacting of stamped bars is also a "lost Downholder "used to make the very thin-walled press the formed flex foil onto the joining partner and the gap in the generation of the electrical contact point sure. In appropriate training of the joint can the "lost hold-down" integrated into the stamped part component be so that no additional component is needed. Both Punching can, for example, a dome-shaped elevation be provided, which preferably in the region of the recess, where the electrical contact is generated lies. The punched grid and / or the conductor, so for example a Cu conductor, can be provided with a metallic coating.

at All the above-described electrical contacts The Flex Conductor (FPC) can be both sides, one-sided or even not be stripped. Preferably, to the thermal joining process not influenced by the insulating layer (vaporizing Insulation layer when welding the insulation), on both sides stripped flex conductor used.

The inventively proposed contacting possibility and inventively proposed construction of a gap-free composite of hold-down, thin conductor and electrical joining partner avoids an otherwise occurring deflection of the very thin-walled flex foil and allows a gap-free fixation and positioning, as previously known in the prior art solutions by complicated clamping devices had to be generated. The thermal deformation during heating of the very thin-walled flex foil is considerably reduced by the areal pressure of the "lost hold-down". As a result of the solution proposed according to the invention, the joining zone, ie the point of introduction of the laser beams, is considerably relieved mechanically to produce the electrical contacting. The coupling of the laser beam is favored by the formation of the hold-down with a trough-shaped depression. The entry of thermal energy in the very thin-walled electrical cable carrier is reduced, so that damage can be avoided. The tracks on the flexible cable carrier are at he According to the invention proposed solution at the beginning of the process is not directly exposed to the laser radiation but only indirectly via intermediate circuits of the made of metallic material blank holder. The proposed solution according to the invention can be used in particular in thermally and mechanically highly loaded control devices, such as applications in the field of transmission control.

In Development of the invention proposed Solution may be the "lost" downholder be replaced by an additional metallic element which the recess on the very thin-walled electrical Component Flexfolie, FPC closes or surmounted, so that a laser welding connection can be made.

In a first embodiment of this development of the invention proposed Solution becomes a metallic joining partner in the Recess at the top of the flex film inserted. The additional Metallic joining partner can be by soldering or diffusion bonding or the like connected to the electrical conductor flex foil, FPC become. The additional metallic joining partner, on the one hand as a separate component in the recess on the top the electrically to be contacted flex film can be used may also be part of the flex foil that is in the area where the Recess for coupling the laser radiation is, about the isolation protrudes. The additional metallic joining partner Furthermore, in the region of the recess, at which the thermal Energy of a laser is coupled to the top of the flex foil be glued on. The additional metallic joining partner for at least partially closing the recess ("illumination opening") is advantageously made of a copper material or from a good weldable workpiece. Preferably becomes the additional metallic joining partner a material of the same material group as the one to be contacted electrical component Flexfolie, FPC manufactured. For improvement the heat input becomes the additional metallic one Joining partner coated in an advantageous manner, such as tinned or nickel plated.

In In another advantageous application, electrical Connections are made between flex films. It leaves a simple contacting of two very thin-walled allow trained flex conductors or FPCs without that there is a gap between the two flex foils to be considered as conductors arises, which adversely affects the joining process.

The According to the invention proposed solution can be used in the manufacture of electrical contacts between Flex conductors and other conductor carriers, such as Punctures and pins are used. Furthermore, there is a Potential for use with all electrical connections of flex cables and other conductor structures, such as pins or punched grids, for thermally and mechanically highly loaded control units, such as for applications in the field of transmission control, before.

Brief description of the drawings

Based In the drawings, the invention will be described below in more detail.

It shows:

1 a first embodiment of an electrical contact between a trained as a flex foil conductor with "lost hold-down",

2 a further embodiment of an electrical contact between a flex foil as a thin-walled conductor and a stamped grid,

3 a variant of the electrical contact between a stamped grid and the thin-walled, designed as a flex foil electrical conductor,

4 a further embodiment of an electrical contact between a trained as a flex foil conductor and a contact pin (pin) and additional metallic joining partner,

5 a variant of an electrical contact between a thin-walled flex foil with adapted conductor geometry in the region of the recess,

6 a variant of an electrical contact between a thin foil formed as a flex foil and a glued additional metal joining partner,

7 an embodiment of an electrical contact between two formed as a flex foil electrical conductors with the interposition of an additional additional metallic joining partner,

8th a variant of an electrical contact with a terminal acting as a bent punched grid and

9 a variant of an electrical contact with a hold-down, which projects beyond the edge of the recess.

variants

For the purposes of the present invention disclosure are under a flexible electrical cable carrier 10 a flex film, a FPC (Flexible Printed Circuits) and FFC understood. This flexible electrical conductor carrier 10 include conductors formed as very thin films whose conductor thickness 12 is on the order of a few microns of copper to a few hundred microns of copper. In the present context, the term "lost hold-down" 26 understood a hold-down, which remains after the joining process, ie a cohesive, thermally successful joining process on the component and thus is no longer available for further joining operations.

From the illustration according to 1 is a first embodiment of the present invention proposed electrical contact closer.

The representation according to 1 It can be seen that on a thin-walled flexible electrical cable carrier 10 , which may be flex film, FCC or flexible printed circuits (FPC), on top 18 and possibly also on a bottom 20 or on both sides 18 . 20 a recess 44 is produced. From the illustration according to 1 shows that the flexible electrical conductor 10 essentially has a layer structure at the top 18 a first insulation layer 14 , on the bottom 20 a second insulation layer 16 as well as not shown drawing corrosion protection layers may include.

The electrical contact is made by that from the top 18 a heat source 22 , which is for example a laser or the like, heat in a down made of metallic material hold-down 26 is coupled. To create a gap-free composite 42 becomes the downholder made of metallic material 26 in the area of its peripheral edge 30 evenly by a clamping force 24 applied. By the tension 24 is achieved that a gap-free composite 42 between the hold downs 26 , the top of the flexible electrical cable carrier 10 as well as a front side 34 one in the illustration according to 1 designed as a pin or contact pin electrical joining partner 32 established. As long as the clamping force 24 on the downholder 26 , in particular on its peripheral edge 30 , acts, remains the gap-free composite 42 maintained and it can be generated electrical contact without the flexible electrical conductor carrier 10 even the action of the heat source 22 coupled radiation would be exposed and therefore damage the same can be avoided.

From the illustration according to 1 it turns out that the hold down 26 in comparison to the boundary of the recess 44 is sized larger in the radial direction, so that an overlap 40 between the surrounding edge 30 the hold-down 26 and the edge regions of the recess 44 on the top 18 of the flexible electrical cable carrier 10 as part of the gap-free network 42 established.

The recess 44 is preferably through a stripped region of the flexible electrical cable carrier 10 educated. The trough-shaped depression 28 the hold-down 26 represents in this context a favorable for the laser welding process reproducible surface for the radiation coupling. The preferably made of metallic material hold-down 26 becomes during the welding process with the flexible electrical conductor 10 on the one hand and on the other hand with the front side 34 of the joining partner 32 - formed as a contact pin - welded and remains within the gap-free composite 42 after the coupling of the radiation power by the heat source 22 represents the electrical contact. With the hold down 26 it is thus a gap-free composite 42 remaining "lost component".

Because over the surrounding edge 30 of the made of metal workpiece holder 26 the tension 24 in the gap-free composite 42 is initiated, the contact pin is used 32 , or its bottom 20 assigning end face 34 , the derivation of the clamping force 24 , This will ensure that the gap-free composite 42 remains biased gap-free, especially during the thermal joining of the components involved 26 . 10 and 32 , Furthermore, by the in 1 arrangement shown avoided that the top of the thin flexible electrical rule carrier 10 , which is a flex foil only a few microns thick, directly from the heat source 22 exposed and thereby damaged.

In a further advantageous embodiment possibility of the inventively proposed electrical contacting 42 as shown in 1 can the hold down 26 be made of a magnetic material. In this case, the placement can be carried out with a correspondingly provided clamping device by means of a magnetic holder. After the thermal joining, ie the laser welding, when removing the here in the illustration according to 1 Not shown clamping device, the magnetic fixation of the blank holder 26 on the clamping device by lifting the gap-free composite 42 detached from the jig.

Preferably, the hold-down 26 made of a material which the conductor material and / or the material of the joining partner 32 corresponds to in the two connection zones within the gap-free network 42 to achieve a metallurgically optimal design of the electrical contact.

The hold down 26 can have through appropriate metallic surface coatings (Sn, Au, Ag or Ni). Furthermore, the downholder 26 also include anticorrosion coatings.

The thickness of the hold-down 26 - Seen in the beam direction of the heat source - is preferably such that this is the layer thickness of the first insulating layer 14 of the flexible electrical cable carrier 10 exceeds. Depending on the material of the blank holder 26 and adapted to the thermal joining process, the thickness of the blank holder can 26 be selected in an advantageous manner adapted to a laser process. Be several electrical contacts - as in 1 shown - generated on a component, it may be advantageous, the individual hold-down 26 to supply the joints and a clamping device in a hold-down assembly in the manufacturing process. This can be done, for example, such that the hold-down 26 For example, as stamping / embossing parts on a belt fed to the process and there cohesively with the thin flexible electrical power carriers 10 be joined. The hold down 26 For example, it can be punched out of a band-shaped hold-down material or separated by a laser process.

Another embodiment of the in the illustration according to 1 reproduced electrical contact is the joining partner (pin) shown here 32 made of a material that can be magnetized. As a result, the clamping device can be constructed considerably simpler, in particular in the event that the downholder made of metallic material 26 is made of a magnetic material and the voltage within the gap-free composite 42 from downholder 26 , the flexible electrical conductor 10 and the contact pin 32 caused by the magnetic force and maintained during the formation of the electrical contact.

The representation according to 2 is a wide execution possibility of the invention to take electrical contact.

Also according to this illustration, the electrical contact is through a gap-free composite 42 educated. Unlike in 1 illustrated embodiment of the electrical contact is in the embodiment according to 2 the joining partner through a stamped grid 36 educated. Advantageously, the stamped grid 36 on the bottom 20 the recess 44 for contacting the lower planar surface of the flexible electrical cable carrier 10 a dome-shaped elevation 38 educated. In the in 2 illustrated embodiment of the dome-shaped survey 38 is this plan educated; 3 shows a variant in which the dome-shaped elevation 38 in the stamped grid 36 a rounded shape, for example, hemispherical, may have.

Also in the illustration according to 2 gets into the perimeter 30 of the made of metallic material hold-down 26 the tension 24 initiated. By introducing the clamping force 24 in the hold down 26 becomes on the bearing surface 36 between the bottom of the hold-down 26 and the top of the flexible electrical wire carrier 10 and the plan side of the dome-shaped elevation 38 and the underside of the flexible electrical cable carrier 10 the gap-free composite 42 educated. This is during the thermal joining process, ie during the coupling of the radiant power via the heat source 22 at the top 18 of the gap-free composite 42 , maintained.

Also at the in 2 shown gap-free composite 42 the hold-down remains 26 after formation of the cohesive connection between the flexible electrical rule line carrier 10 and here as a punched grid 36 trained joining partner as "lost hold-down" in the gap-free composite 42 after the thermal joining of the components 26 . 10 and 38 represents the electrical contact.

Analogous to the representation of the electrical contact according to 1 includes the flexible electrical conductor carrier 10 at its top 18 the first insulation layer 14 and at its bottom 20 the second insulation layer 16 , Also according to the in 2 illustrated embodiment overlaps the hold-down 26 the edge areas of the recess 44 at the top 18 of the gap-free composite 42 ,

3 shows a further embodiment of an electrical contact as proposed according to the invention, wherein the "lost" hold-down 26 in accordance with the embodiment in 3 is not a separate component, but in the joining partner, in this case in the stamped grid 36 , is integrated, ie a part of the stamped grid 36 forms.

From the illustration according to 3 it turns out that as a punched grid 36 trained joining partner a 180 ° deflection 52 having. The 180 ° deflection 52 extends, starting from the here formed with rounded dome-shaped elevation 38 of the joining partner 36 to the flexible electrical conductor 10 or its insulation layers 14 and 16 around to the top 18 of the gap-free composite 42 ,

Both in the embodiment according to 2 as well as in accordance with 3 may be the top of the dome-shaped elevation 38 , be it in 2 shown plane, be it in 3 rounded shape, be provided with a metallic coating.

For all in the representations according to 1 to 3 illustrated electrical contacts, by gap-free composites 42 can be formed, the flexible electrical conductor carrier 10 both as one-sided or not stripped on both sides. In a preferred embodiment, however, to the laser welding process through the insulating layers 14 . 16 not to be influenced, both sides stripped flexible electrical cable carrier 10 , such as As flex films, used (see position of the recess 42 at the top 18 or the bottom 20 thin flexible electrical cable carrier 10 ).

The in 3 illustrated embodiments of the inventively proposed electrical contacting is common that the previously occurring in solutions according to the prior art deflection of the thin flexible electrical conductor carrier 10 and the gap-free fixation of the same within a gap-free composite 42 in accordance with the invention proposed training of electrical contact in the context of the gap-free composite 42 is considerably reduced. The thermal deformation during heating of the flexible electrical cable carrier 10 during the joining process is by the flat contact pressure (see 46 between the hold down 26 and the top of the flexible electrical wire carrier 10 ) significantly reduced. In the proposed design of the electrical contact according to the invention, the joining zone is particularly mechanically relieved. The coupling of heat through the heat source 22 can by suitable designs of the made of metallic material hold-down 26 be designed reproducible, which significantly improves the reproducibility of the process and thus its automation security. The thermal energy input in the flexible electrical cable carrier 10 is reduced, unwanted damage thus avoided, as the flexible electrical conductor 10 not directly the heat source 22 is exposed.

The inventively proposed solution of forming an electrical contact according to the 1 and 2 can with all electrical connections of thin flexible electrical conductor carriers 10 For example flex foils, FPCs or FFCs, with other conductor structures, be it contact pins 32 or stamped grid 36 , are used. In particular, the solution proposed according to the invention is suitable for thermally and mechanically highly loaded control devices, such as for applications in the field of transmission control.

The representation according to 4 a further embodiment of the present invention proposed contacting is shown.

Also in this electrical contacting is a gap-free composite 42 generated. The gap-free composite 42 but instead of the hold-down 26 as in the embodiments according to the 1 . 2 and 3 , an additional metallic joining partner 54 , From the illustration according to 4 shows that the additional metallic joining partner 54 from the top 18 between the mutually assign the edges of the first insulating layer 14 on the flexible electrical conductor carrier 10 is up. A gap forms laterally 56 out. The recess 44 is also located on the underside of the flexible electrical cable carrier 10 between the two stripped ends of the second insulation layer 16 , The recess 44 can be oval, circular or square. From the illustration according to 4 also shows that it is the joint partner 32 already related to 1 illustrated pin-shaped joining partner, the one end face 34 has, acts. The front side 34 supports within the gap-free composite 42 - Analogous to the representation according to 1 - The thin flexible electrical conductor carrier 10 from. The additional metallic joining partner 54 closes or covers the recess 44 , In addition to the in 4 illustrated embodiment, the additional metallic joining partner 54 in the recess 44 be inserted and also with the top, that of the heat source 22 assigning side of the electrical conductor 22 , soldered or otherwise joined. Furthermore, there is also the possibility of the additional metallic joining partner 54 by means of diffusion welding with the flexible electrical conductor carrier 10 connect to. The additional metallic joining partner 54 can be larger or smaller than the joining partner 32 be executed. At the joining partner 32 it is not necessarily a contact pin, but it may also be a punched grid 36 , as related to 2 represented, act. The gap freedom of the composite 42 can on the one hand by applying the clamping force 24 On the other hand, there is also the possibility of the gap-free composite 42 to magnetism ren, so that the gap is generated within the gap-free composite essentially by the magnetic force.

In the embodiment according to 5 is a further illustration of a gap-free composite, which finally forms the electrical contact after thermal joining shows. In contrast to the embodiment according to 4 has the flexible electrical conductor carrier 10 an adapted ladder geometry 58 on which the additional metallic joining partners 54 as shown in 4 replaced. This and the flexible electrical cable carrier 10 are as shown in 5 , executed as a component, compare reference numerals 58 , The adapted conductor geometry 58 is preferably designed so that the adapted conductor geometry 58 under formation of a gap 56 - Analogous to the representation according to 4 - in the recess 44 protrudes and directly the radiant power of the heat source 22 is exposed. In the embodiment according to 5 includes the electrical composite 42 only the adapted conductor geometry 58 as well as the joining partner 32 , In this case, only a cohesive connection between the underside of the flexible electrical cable carrier 10 and the front side 34 of the joining partner 32 generated.

6 shows a further advantageous embodiment of the inventively proposed electrical contact, wherein the gap 56 - as in 4 represented - by an adhesive 60 is closed. The glue 60 becomes caterpillar-shaped around the additional metallic joining partner 54 applied and fixed to the top of the flexible electrical cable carrier 10 , In the embodiment according to 6 this is the additional metallic joining partner 54 - Analogous to the representation according to 4 - a separate component.

This is the one about the heat source 22 coupled radiation power directly exposed, while the thin-walled flexible electrical conductor carrier 10 The radiation power is not directly exposed, as between the heat source 22 and the top of the flexible electrical wire carrier 10 the additional metallic joining partner 54 is arranged. Its bearing surface at the top of the flexible electrical cable carrier 10 is by reference numerals 62 identified.

Also in the embodiment according to 6 becomes a gap-free composite 42 generated, the additional metallic joining partner 54 , the flexible electrical conductor 10 and the joining partner designed here as a contact pin 32 full. The gap freedom within the gap-free composite 42 is due to the resilience 24 generated. This acts either directly on the additional metallic joining partner 54 a or, as in the embodiment according to 5 shown on an adapted conductor geometry 58 in which the additional metallic joining partner 54 and the flexible electrical conductor carrier 10 represent a component. Alternatively to applying a clamping force 24 , the gap freedom within the gap-free composite 42 also be generated and maintained by magnetic force. This is a magnetization of the joining partner 32 as well as the additional metallic joining partner 54 conceivable.

The in the 4 . 5 and 6 illustrated additional metallic joining partners 54 becomes the partial closure of the recess 44 made in an advantageous manner from a copper material or a good weldable material. Preferably, the additional metallic joining partner 54 made of a material of the same material group as the flexible electrical cable carrier 10 , To improve the heat output of the heat source 22 can be the additional metallic joining partner 54 or the adapted conductor geometry 58 , integrally formed in the flexible electrical cable carrier 10 be provided with a coating, such as a tinning or nickel plating.

The representation according to 7 after all, is a flex-conductor composite 64 refer to. This embodiment shows a first conductor 66 , formed from a flexible electrical conductor carrier 10 , first insulation layer 14 , second insulation layer 16 and the additional metallic joining partner 54 and a second conductor 68 which is constructed identically. contact surfaces 70 form between the bottom of the second insulation layer 16 of the first leader 66 and the top of the first insulation layer 14 of the second conductor 68 , Between the first conductor 66 and the second conductor 68 arise contact surfaces 72 extending between the bottom of the flexible electrical cable carrier 10 of the first leader 66 and the tops of the additional metallic joining partners 54 of the second conductor 68 ,

By the in 7 illustrated embodiment is a simple contacting two conductors 66 . 68 within a flexible conductor network 64 created without being between the first conductor 66 and the second conductor 68 a gap, due to the thickness of the insulation layers 14 respectively 16 , which could adversely affect the joining process. The gap freedom within the flexible conductor composite 64 can on the one hand by applying the clamping force 24 take place analogously to the preceding embodiments, or by magnetic force in magnetization of the components of Flex conductor assembly 34 brought about and maintained. Optionally, another additional metallic joint partner can be 54 from the bottom to the thin-walled flexible electrical cable carrier 10 hire.

The above with reference to the embodiments according to the 1 to 7 illustrated electrical contact within the gap-free composite 42 or within the flex conductor network 64 is produced by a method in which initially a recess 44 on at least one side 18 or 20 of the electrical conductor is produced. Subsequently, under the action of a clamping force 24 the formation of a gap-free composite 42 or a flexible conductor composite 64 comprising the hold-down 26 , an integrated hold-down 26 or alternatively an additional metallic joining partner 54 , the flexible electrical conductor 10 as well as the joining partner 32 . 36 which is either a contact pin 32 or a punched grid 36 as described above.

About a preferably designed as a laser heat source 22 the coupling of heat radiation by a heat source takes place 22 on the side of the gap-free composite 42 on which the hold down 26 is arranged or on top of a flex conductor composite above an additional metal joining partner 54 , The gap freedom within the gap-free composite 42 is by applying a clamping force 24 at the top of the gap-free composite 42 , especially at the hold-down 26 or the additional additional joining partner 54 , initiated and to the joint partner 32 respectively 36 or a tensioning device derived.

To simplify the joining process of joining partners 26 . 54 with the flexible electrical conductor carrier 10 , the contact pin 32 or the punched grid 36 or the training of the flexible conductor network 64 as shown in 7 , The components can be made of a magnetic material or a magnetizable material. In this case, the clamping force to form the gap is within the gap-free composites 42 or the flex conductor network 64 generated by the magnetic force, which greatly simplifies the clamping device and reduces the clamping forces. In a development of the method proposed according to the invention, the additional joint partner made of metallic material can be used 54 as related in 5 described in one piece as adapted geometry 58 directly in the flexible electrical cable carrier 10 be formed, but there is also the possibility of an additional metal joining partner 54 with the top of the flexible electrical cable carrier 10 to glue, to solder or otherwise fasten. Also a simple insertion of the metallic joining partner 54 in the recess 44 at the top of the flexible electrical cable carrier 10 is possible. Advantageously, a cohesive connection between the hold-down 26 as a separate component or an integrated hold-down 26 as part of a stamped grid 36 generated, with the hold-down 26 the recess 44 surmounted laterally. The recess 44 is achieved by stripping the thin flexible electrical cable carrier 10 at the top 18 and / or the bottom 20 or shown on both sides.

8th shows a variant of an electrical contact with a terminal acting bent formed punched grid.

8th shows a gap-free formed flex conductor composite 64 , a first flex conductor 66 and a second flex conductor 68 full. Between each of the first and the second insulation layer 14 . 16 surrounded flexible electrical cable carriers 10 is an additional metallic joining partner 54 added. This is at the top and bottom of a formed in terminal form punched grid 26 applied. Rounded areas 50 put the above and below parallel to the additional metallic joining partner 54 extending portions of the flexible electrical cable carrier 10 at the top or bottom of the additional metal joining partner 54 on, leaving the contact surfaces 72 arise. The contact surface 70 arises in the flexible conductor composite 64 in accordance with the embodiment in 8th by conditioning the first or second insulation layer 14 . 16 together. From the illustration according to 8th shows that the curved punched grid 48 in this embodiment, analogous to the embodiment according to 3 a 180 ° deflection 52 having. The at the top and bottom of the flex conductor composite 64 extending leg of the bent punched grid 48 have at their respective flexible electrical cable carriers 10 assigning sides in each case the rounded dome-shaped elevations 50 on.

9 shows a variant of an electrical contact with a hold-down, which covers the edge of a recess.

As shown in the illustration 9 is apparent, is the hold-down 26 with a circumferential edge 30 provided that the gap 56 between the hold down 26 and the first insulation layer 14 covered. The top of the in 9 shown holding down 26 indicates the heat source 22 too, leaving the flexible electrical conductor 10 is protected against damage when the laser power is coupled in and damage is avoided.

The representation according to 9 it can be seen that the joining partner 32 is designed as a contact pin in this embodiment. However, it could easily be a punched grid 26 or the like.

The in 9 shown gap-free composite 42 on the one hand by the clamping force 24 be acted upon to generate the gap; On the other hand, there is also the possibility of the components 26 and 32 of the gap-free composite 42 by magnetic force to each other, so that the formation of gaps is omitted.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - US 5676865 [0004]
• EP 1155602 B1 [0005]

Claims (16)

Electrical contacting ( 42 . 64 ) between a flexible electrical conductor carrier ( 10 ) and a joining partner ( 32 . 36 . 54 ) with a radiant heat einkoppelnden heat source ( 22 ), characterized in that on the heat source ( 22 ) referring page ( 18 ) of the electrical contact ( 42 . 64 ) a flexible electrical conductor carrier ( 10 ) shielding hold-down ( 26 ) or an additional metal joining partner ( 54 ) is arranged. Electrical contacting according to claim 1, characterized in that the flexible electrical conductor carrier ( 10 ) as flex foil, FPC (Flexible Printed Circuits) or FFC (Flexible Flat Cable), in one conductor thickness ( 12 ) is formed between 10 .mu.m and 400 .mu.m, preferably 30 .mu.m to 100 .mu.m. Electrical contacting ( 42 . 64 ) according to claim 1, characterized in that the joining partner a pin (Pin) ( 32 ) or a punched grid ( 36 ). Electrical contacting ( 42 . 64 ) according to claim 1, characterized in that these in a recess ( 44 ) at least one insulation layer ( 14 . 16 ) of the flexible electrical cable carrier ( 10 ) lies. Electrical contacting ( 42 . 64 ) according to claim 1, characterized in that the hold-down ( 26 ) a trough-like depression ( 28 ) and either as a separate metallic component ( 26 ) or in a joint partner ( 36 ) is integrated. Electrical contacting ( 42 . 64 ) according to claim 1, characterized in that the hold-down ( 26 ) with an edge of the recess ( 44 ) an overlap ( 40 ) and an edition ( 46 ), which is smaller than the cross-sectional area of the recess ( 44 ). Electrical contacting ( 42 . 64 ) according to claim 1, characterized in that it is attached to a gap-free composite ( 42 ) from the hold down ( 26 ), the flexible electrical conductor carrier ( 10 ) and the joining partner ( 32 ), or from the hold-down ( 26 ), the flexible electrical conductor carrier ( 10 ), the punched grid ( 26 ), or on a flex-conductor composite ( 64 ) from a first ladder ( 66 ) and a second conductor ( 68 ) is executed. Electrical contacting ( 42 . 64 ) according to claim 1, characterized in that the hold-down ( 26 ) is made of a magnetic or a magnetizable material. Electrical contacting ( 42 . 64 ) according to claim 1, characterized in that the hold-down ( 26 ) is provided with a surface coating of Sn, Ni, Ag or Au and / or with at least one corrosion protection layer. Electrical contacting ( 42 . 64 ) according to claim 1, characterized in that the joining partner ( 36 ), in particular a stamped grid ( 36 ) a domed survey ( 38 . 50 ), which the flexible electrical conductor carrier ( 10 ) within the recess ( 44 ) on the bottom ( 20 ) is supported. Electrical contacting ( 42 . 64 ) according to claim 1, characterized in that the flexible electrical conductor carrier ( 10 ) within the recess ( 44 ) on the bottom ( 20 ) is supported. Method for producing an electrical contact ( 42 . 64 ) according to one or more of the preceding claims with the following method steps: a) generating a gap-free composite ( 42 ) either from hold downs ( 26 ) or additional metallic joining partner ( 54 ) and the flexible electrical conductor carrier ( 10 ) and a joining partner ( 32 . 36 ) or creating a gap-free composite ( 64 ) from a first ladder ( 66 ) and a second conductor ( 68 ) and at least one other metallic joining partner ( 54 ), b) coupling heat radiation through a heat source ( 22 ) on the side of the gap-free composite ( 42 . 64 ) on the downholder ( 26 ) or the additional metallic joining partner ( 54 ) or an adapted conductor geometry ( 58 ) is arranged. A method according to claim 12, characterized in that method step b) a clamping force ( 24 ) at the top ( 20 ) of the gap-free composite ( 42 . 64 ), in particular in the hold-down ( 26 ) or the additional additional joint partner ( 54 ) and introduced into the joint partner ( 32 . 36 ) is derived. A method according to claim 12, characterized in that the gap freedom within the gap-free composite ( 42 . 64 ) by magnetization of the hold-down ( 26 ), the additional metallic joining partner ( 54 ), the joining partner ( 32 . 36 ) or the first conductor ( 66 ) and the second conductor ( 68 ) is produced. A method according to claim 12, characterized in that the additional metallic joining partner ( 54 ) on the top ( 18 ) of the flexible electrical cable carrier ( 10 ) is glued or soldered. Method according to claim 12, characterized in that the recess ( 44 ) on the bottom ( 18 ) and / or the top ( 20 ) of the flexible len electrical conductor ( 10 ) by stripping at least one insulating layer ( 14 . 16 ) is produced. Method according to claim 12, characterized in that between the hold-down device ( 26 ) of a metallic material and the edge of the recess ( 44 ) an overlap ( 40 ) is produced.