DE19749650C2 - Method for producing an electrical connection of a module having electronic components used in a cavity of a card body of a chip card - Google Patents

Description

The invention relates to a method for producing a electrical connection one in a cavity one Card body of a chip card used electronic Module with an antenna layer or antenna coil.

Chip cards for contact, but also contactless, d. H. Inductive data transmission have one with the cards body-connected chip card module, one on one Plastic carrier located semiconductor chip, which in the case of contact cards with a galvanically generated one Contact field is connected. Be in a card reader these contact areas are electrically scanned so that the ge desired communication becomes possible.

In the case of contactless, inductive systems, the Da occurs transmission by alternating electromagnetic fields, with means at least one in the chip card or in the card body arranged induction coil or antenna coil.  

In the case of so-called combination cards, both systems mentioned above are united in one card. The combination card therefore has both via a contact field for contact transfer as also via an inductively connectable contact. It is for that required, in addition to the electrically conductive connections from Semiconductor chip for the system for contact transmission also connections to the system for inductive data transmission manufacturing.

In a known method for producing a chip card, especially those where both means of contactless Data transmission as well as the mentioned galvanic contact a module is built into a card body introduced, which comprises an IC chip.

The module is in a cavity z. B. generated by milling was inserted into the card body and by means of joining or the like with the card body to obtain one corresponding mechanical connection laminated.

An electrically conductive connection between the module and cards body or on the card body contacts that are in connection with the induction coil, for example indicates that an anisotropic conductive adhesive fabric in the area of the connection points and / or the connection transfer of the respective means for a contactless data applied and the adhesive at least in the area of Junction point is compressed or compressed to the extent that an electrically conductive bridge is created.

In the case of an adhesive with conductive particles, this leads so that the particles in the area between the connection and the means for contactless data transmission touch, from which the desired conductive connection re results.  

Chip cards are known, in which one in the card body coil wound from wire is provided, the ends of which with An ver contacts of the chip or its carrier or module are bound. The overall arrangement is inserted in the card body poured, the manufacture in detail technologically very involves complex steps.

In addition, chip cards have already been presented at wel the antenna has been etched out of an antenna layer, wherein the antenna has chip contacts, which via a conductive adhesive with the antenna contacts of the chip or Nes carrier or module are connected.

However, it has been shown that the required Pressure, temperature and time regimes for reliable production both electrical and mechanical connections is subject to tolerances, so that when the process is not optimal parameters the long-term stability of such manufactured Combination tickets is reduced and that it is due to the dimensions and the plastic properties of the module and the card wearer to warping and tension in the card with the Result of contact faults and therefore less reliable can come.

Another problem is that the ones to be bridged Distances between the contacts for the antenna and the counter contacts for the electronic components of the module Have size that is not easily due to conductive adhesive or Lot can be bridged. It has also been found that due to the lack of compatibility, conductive adhesive fabrics on the one hand and laminate adhesives on the other hand the Sta stability of the connections does not have the desired long-term stability len properties.

DE 195 00 925 A1 describes a chip card for contactless Data transmission previously known, which one separately in the cards  has built-in transmission module. Still is an antenna in the form of a coil for inductive data and En Energy transfer and / or in the form of an electrically conductive layer capacitive transmission available. For electrical The transmission module instructs coupling to the chip module contact surfaces. Between the contacts in the card body and the antenna contacts is a conductive connecting, ela contact properties or a electrically conductive support foot, in the form of a bolt arranges. However, the previously known connection arrangement Disadvantages with mechanical loads on the chip card, so that their reliability is limited in daily use is.

It is therefore the object of the invention to produce a method make an electrical connection one in a cavity the card body used in a chip card, electroni module with components with an antenna layer or specify antenna coil, the electrical contacts Si security between the module and the antenna layer or the connector tennis coil also under all practical circumstances and conditions conditions, also with regard to the torsional loads is so that there is a high long-term stability and out sufficient reliability, e.g. B. in a so-called IC card for contact-based and contactless data transmission or data exchange to a terminal.

The object of the invention is achieved with a Connection method according to claims 1 or 3, wherein the Subclaim includes an appropriate embodiment.

The chip card used comprises a card body, one of this carved cavity, a chip or other electronic components with contacts, especially for Connection of an antenna and an antenna layer with Antenna devices, especially a coil in the  Card body, which chip contacts for connecting the chip having. Between those with a larger distance Chip contacts and the antenna contacts become conductive connecting an elastic properties Contact element or a conductive metallic bolt arranged.

In the case of using elastic properties send contact element, especially the helical compression spring, this becomes un when inserting the chip or a chip module ter tension held, the spring ends with the in essential opposing contact surfaces in interaction kick and there a positive and / or cohesive Ver enter into a bond. Because the contact surfaces usually made of copper of appropriate ductility, can at ge suitable spring material from an intermetallic compound in the area of the direct contact surfaces of the spring ends with the contact surface.

The contact element having elastic properties or the conductive metallic bolt is in an out in the card body, the bottom surface of which corresponds to the Contact surface that leads to the antenna and a Be is part of this antenna, is formed.

Instead of a cylindrical helical compression spring, a preferably used in the form of a truncated cone or barrel become. In particular, the intended progressive course of the The spring characteristic of a truncated cone spring is at a suitable Di dimensioning for long-term contact stability after the lami kidney or gluing the module is an advantage.

Depending on the distances to be bridged between the opposite contact surfaces can also Ver using a disc spring would be an advantage.  

The connection process is in the card body in the area of the contacts for the antenna layer or antenna coil introduced at least one recess per contact, the Recess the lateral fixation of the elastic Properties having contact element, in particular the helical compression spring mentioned. The one in the recess introduced spring touches the contact surface for the antenna layer or coil and on the other hand the Mating contact surface of the module while maintaining the desired one electrical properties. The dimensioning of the elasti cal contact element is chosen so that in the state of finished card, d. H. with glued or laminated module sufficient spring forces are available to also at Warping or other mechanical loads to ensure electrical contacting.

In a variant of the connection procedure, the minimum least a recess that is present in the card body conductive metallic bolt introduced so that the Ends of the bolt the contact surfaces for the antenna layer or coil on the one hand and the mating contact surfaces of the module on the other hand touch and there with conductive adhesive or soldering be connected to this. Contacting the conductive me metallic bolt with the in the card body or the recess located contact surface is expediently before the one set the module executed and in terms of contact quality lity controlled.

The pre-assembled card then takes up the chip module, the module with the chip face-down into the cavity used and there by gluing or laminating with the Card body is connected. About an angry one Amount of conductive adhesive, located on the top of the metallic Bolt, the mating contact on the module can be contacted electrically. Especially if this Mating contact by soldering is due to the previous  assembling the thermal load with this solder walked low.

The invention is illustrated below with the aid of an embodiment game and explained with the help of figures become.

Here shows:

Figure 1a shows a cross section through a chip card with Ausneh tion for the contact element and cavity for the Mo module.

Fig. 1b is a representation of Fig. 1a, but with already in the recess elastic Kontaktele element, namely a helical compression spring, and

Fig. 1c shows a cross section through a card with an inserted module, and electrical connection made via the elastic contact element.

In the embodiment described with reference to FIGS . 1a to 1c, a contact distance to be bridged between the module 1 or the antenna connection contacts 2 and the contacts 3 in the card body 4 is assumed to be in the range of essentially <0.5 mm. The contacts 3 are connected to an antenna coil 5 or are part of the same.

As the figures show, a cavity 6 is introduced in the card body, which serves to accommodate the module 1 . On the module 1 there is, as can be seen in FIG. 1c, a face-down mounted chip 7 .

The card body 4 has a recess 8 in the area of the contacts 3 . This recess 8 is used for lateral fixation of an elastic contact element, in the example shown a helical compression spring 9 . Instead of this screw pressure of FIG. 9 , an electrically conductive or elastic plastic body provided with a conductive coating can also be used.

During the final assembly step, ie inserting the module 1 with chip 7 into the cavity 6 and connecting to the card body 4 , the antenna connection contact surface or the antenna connection contact 2 comes into active connection with the upper end of the coil spring 9 while maintaining an electrical contact. Due to the sharp-edged spring ends that arise during the formation of the spring or that are produced by grinding, in conjunction with the ductility of the usual copper contact surface material, a non-positive and positive connection is achieved that has intermetallic properties.

In an embodiment not shown in the drawing, instead of a coil spring 9, a metallic bolt is fixed by means of conductive adhesive or by soldering in the recess 8 , so that a prefabricated card body with primary antenna coil contact results.

After preferably electrically testing this primary contact, the module 1 is then connected to the card body 4 , the antenna connection contact then also being able to be implemented using conductive adhesive and / or soldering. Despite the thermal capacity of the metallic bolt, which serves to bridge the contact spacing, only a small amount of thermal energy is required due to the splitting of the connecting step in the final soldering, so that the thermal load in the area of the active components, namely the chip, can be kept low.

Using the exemplary embodiments described above succeeds in a particularly advantageous way, electrical connection also over a large distance from opposite cones create beats that go beyond that, especially with ela tical contact element, are able to withstand bending stress and  Bending forces during the operation or use of the chip card occur regularly, without making contact and long-term stability is impaired.

Claims (3)

1. Method of making an electrical connection one in a cavity of a card body of a chip card used module having electronic components with an antenna layer or antenna coil, being in the card body in the area of the contacts for the Antenna layer or coil at least one Ausneh tion is introduced per contact, and the recess for lateral fixation of elastic properties send contact element, especially a screw compression spring serves such that the ends of the contact mentes the contact area for the antenna layer or -coil on the one hand and the mating contact surfaces of the module on the other hand touch. 2. The method according to claim 1, characterized, that a conductive plastic body as an elastic element is used by. 3. Method of making an electrical connection one in a cavity of a card body of a chip card module used electronic components with an antenna layer or antenna coil, being in the card body in the area of the contacts for the Antenna layer or coil at least one Ausneh tion is introduced per contact, the recess for lateral fixing of a conductive metallic bolt serves such that the ends of the bolt make contact area for the antenna layer or coil on the one hand and on the other hand touch the mating contact surfaces of the module and connected to them by conductive adhesive or soldering become.