EP2346058A2 - Corps en couche pouvant être laminé à chaud et doté d'au moins un élément de commutation électrique - Google Patents

Corps en couche pouvant être laminé à chaud et doté d'au moins un élément de commutation électrique Download PDF

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Publication number
EP2346058A2
EP2346058A2 EP10015933A EP10015933A EP2346058A2 EP 2346058 A2 EP2346058 A2 EP 2346058A2 EP 10015933 A EP10015933 A EP 10015933A EP 10015933 A EP10015933 A EP 10015933A EP 2346058 A2 EP2346058 A2 EP 2346058A2
Authority
EP
European Patent Office
Prior art keywords
contact
layer
insert
electrically conductive
recess
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP10015933A
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German (de)
English (en)
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EP2346058A3 (fr
EP2346058B1 (fr
Inventor
Manuela Grundwürmer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Giesecke and Devrient GmbH
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Giesecke and Devrient GmbH
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Publication date
Application filed by Giesecke and Devrient GmbH filed Critical Giesecke and Devrient GmbH
Publication of EP2346058A2 publication Critical patent/EP2346058A2/fr
Publication of EP2346058A3 publication Critical patent/EP2346058A3/fr
Application granted granted Critical
Publication of EP2346058B1 publication Critical patent/EP2346058B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H01H13/702—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2229/00—Manufacturing
    • H01H2229/024—Packing between substrate and membrane
    • H01H2229/03—Laminating
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2231/00—Applications
    • H01H2231/05—Card, e.g. credit card

Definitions

  • the present invention relates to a pressure contact device for a laminated body and to a method for its production.
  • the layered body may in particular be the card body of a chip card.
  • Under pressure contact device is basically an arrangement for bringing about an electrical contact with two in the unactuated ground state spaced contact surfaces understood, which are brought together in the actuated state by exerting a pressure.
  • Pressure contact devices in this sense are, for example, electrical membrane switches or electrical foil load circuits. It is known to produce a film switching element or film button multiple layers of film, between which a switching contact is to be made to coat one above the other and cold to glue together.
  • a perforated and electrically insulating intermediate foil is arranged between two electrically conductive circuit foils (contact foils), which serves as a spacer and prevents the contact foils touching in the idle state of the foil switching element. The intermediate foil causes the film switching element is opened in the idle state.
  • the contact foil By exerting a pressure on at least one of the two contact foils in the region of the perforation of the intermediate foil, the contact foil is deformed and an electrical contact between the two contact foils is produced. If pressure is no longer exerted, the contact foil takes on its original shape due to its elasticity. As a result, the electrical contact between the two contact foils is interrupted.
  • the foil switching element therefore closes the Circuit circle only during the application of pressure on at least one of the two contact sheets, and opens it again when the pressure is released.
  • the known film switching element can be used in many ways and has proven itself well. However, it requires that the films must be bonded by cold bonding, since the material softening occurring during hot lamination would cause the perforation of the intermediate film would be filled and thereby the function of the film switching element would be impaired.
  • the bonding of the film layers by hot lamination has the advantage over cold bonding that the film layers soften and become inseparable during hot lamination. In cold bonding this is not the case, so that manipulations of the film composite material are not excluded.
  • each switching element in the layer stack is formed by means of a material having a higher softening temperature than the film material such that within the switching element, a material passing through this material against the surrounding film material delimited cavity arises.
  • the films with low softening temperature provided with recesses into which the switching element is introduced in the form of two contact elements and an electrically insulating spacer, wherein the spacer is arranged spatially between the contact elements.
  • the contact elements are plate-shaped, in particular as circular disks, formed, and the spacer forms a frame, in particular a ring which limits the cavity laterally.
  • the films are bonded together by hot lamination, wherein the contact elements and the spacer of a material with a higher softening temperature does not soften, so that there is no danger that the cavity is filled. The switching element is thereby reliably enclosed and thereby protected against manipulation.
  • a disadvantage of the arrangement according to DE 103 39 052 A1 is that the production is relatively complicated and complicated. There are three insert elements, ie two contact elements and a spacer, per switching element needed, and these insert elements must be exactly in register in the stack of layers above one another and also accurately aligned with interconnects between the films of the layer stack.
  • Object of the present invention is to provide a pressure contact device, which can be reliably realized in a composite body and thereby can be produced in a simple manner.
  • the object of the present invention is further to provide a method for producing such a pressure contact device.
  • a pressure contact device can be formed in a card body of a chip card. It can be made on a simple and inexpensive. It is of particular advantage that the production of correspondingly equipped chip cards can be connected to commonly used production methods.
  • a pressure contact device may comprise only a single switching element or a plurality of switching elements.
  • a single switching element for example, to fabricate a keyboard, as many switching elements in the desired arrangement can be formed in the stack of foil layers as are required to make the keyboard.
  • the present invention is also a development of in DE 103 39 052 A1 described arrangement or the method described therein. Surprisingly, it has been found that the spacer can be dispensed with to simplify the production process, and yet a hot lamination process can be used to achieve a material bond between the individual layers of the laminated body without filling the cavity between the contact elements with the material softening occurring during hot lamination. The layers that define the cavity, thereby form directly the wall of the cavity.
  • a laminate with a pressure contact device according to the invention is made up of a plurality of layers, typically of plastic films, forming a layer stack.
  • the layers are printed conductors, between which reversible electrical contact is made.
  • the tracks may be in the same or different planes. The preparation and the interruption of the contact by means of the switching element.
  • the foil layers themselves, at least those contacting the printed conductors or electrically conductive materials of the switching element, must be electrically insulating. The same applies to other materials of the composite, z.
  • the conductor tracks or electrically conductive material of the switching element contact.
  • all foil layers, at least all foil layers, which are related to the electrical switching element consist of materials which are heat-laminatable under usual hot lamination conditions, for example of PVC.
  • two of the heat-laminatable films are provided with recesses for receiving the switching element, i. H. the two contact elements, which form the switching element equipped.
  • the recesses can for example be cut out or punched out.
  • the recesses are typically, but not necessarily, identical in shape and size. We recommend geometrically simple shapes such as circles, ellipses or rectangles.
  • each contact inserts are inserted, ie pieces of film, the recesses in the form and Size as closely as possible.
  • the occurrence of joints between an insert and the surrounding contact layer should be avoided as much as possible.
  • the contact pads preferably have the same thickness as the surrounding contact layer, but are not heat-laminatable like this, ie they have a higher softening point than the surrounding contact layer.
  • the contact pads are typically cut or punched from sheet materials such as polycarbonate films or epoxy films.
  • the contact layers as well as the contact pads may each consist of the same or different materials as long as the materials of the contact pads have a higher softening point than the materials of the contact layers.
  • the contact layers with the contact inserts therein are kept separated by a central layer.
  • a central layer can also be constructed from a stack of several layers, depending on the desired thickness.
  • the film layers with each other it may be useful to build the central layer of several different layers, wherein the outer layers are each selected taking into account the adjacent contact layer.
  • the central layer is provided with a recess, which can also be cut out or punched out, for example.
  • the geometric shape of this recess expediently corresponds to the shape of the recesses in the adjacent contact layers, or one of the recesses, because the recesses in the contact layers can also have different geometric shapes.
  • the dimensions of the recess in the central layer must be smaller than the dimensions of the recesses in the contact layers, because when superimposing the contact layers with the central layer therebetween to form a stack, the contact pads should rest on the central layer and be supported by it in hot lamination. In this case, a cavity is formed in the layer stack, the walls of which are formed by the central layer, and whose top and bottom are formed by the contact elements.
  • the central layer is also made of hot laminatable material or of several individual layers of hot laminatable materials, i. H. the softening point of the central layer is lower than the softening point of the contact elements.
  • the central layer and the contact layers preferably consist of the same material.
  • the monolayers may first be hot laminated and then recessed, or they may be recessed in the unconnected state, and then laminated together simultaneously with the laminating of the contact layers.
  • recesses for receiving functional elements such as chip modules introduced.
  • recesses for a plurality of switching elements may be provided, as required in the manufacture of a keyboard.
  • the generation of recesses is hereinafter referred to as "punching".
  • a laminated body with a pressure contact device according to the invention can be manufactured as a single element in the desired size.
  • the laminates are produced in the form of sheets or endless belts, each with a plurality of switching elements and other functional elements, and then the individual elements separated.
  • the printed conductors can be applied in a known manner, for example by printing, at the respectively desired locations, such as on one or both main surfaces of the central layer, on one main surface of one or both contact layers or on another layer, depending on the structure of the circuit.
  • the tracks can have multiple functions, for example, serve as an antenna.
  • the application of the conductor tracks can take place before or after the perforation of the foil layers, wherein the conductor tracks can be applied directly to the foil layers or to coatings, for example to adhesive layers.
  • conventional printed conductor materials are used, for example silver, copper or gold.
  • one of the contact elements or both contact elements are electrically conductively connected to conductor tracks. Accordingly, the conductive structures of the contact elements are to be formed differently.
  • there are the interconnects between which an electrical contact is established by means of the switching element or the electrical contact is interrupted should be, in a plane.
  • one of the contact elements, the contact element in the plane of the conductor tracks has two spatially separated guide surfaces, ie surfaces of electrically conductive material, each of which has a connection to a conductor track.
  • the other contact element has a guide surface without connection to a conductor track.
  • both contact elements each have a guide surface which is in each case connected to a conductor track.
  • the shape of the guide surfaces can easily be designed so that a secure electrical contact of the Leit vom Kunststoff Kunststoffe involved in the switching process is ensured.
  • the baffles electrically conductive materials are selected, for example, the same materials from which the interconnects are made, such as copper, silver and gold.
  • the application of the baffles can also be carried out in the same way as the printed conductors.
  • the baffles can be applied as a coating by printing, wherein the baffles can be applied before the contact pads are separated from the foil materials and inserted into the recesses of the contact layers, or when the contact inlays already in the recesses of the contact layers.
  • the conductor tracks and the guide surface to be connected can be applied in one operation. It can be at the transition There is no offset between the track and the guide surface.
  • the contact layer with the contact insert is expediently laminated with a carrier film prior to the application of the conductor tracks / conducting surfaces in order to ensure a stable bond between the contact insert and the contact layer. become.
  • laminating with a carrier foil is not required. The same applies in the case of a further embodiment described later on with a "guide surface matrix".
  • a contact insert with a guide surface or with guide surfaces is referred to as a contact element.
  • a contact element is inserted into the recess of a contact layer only after the application of the guide surface (s), care must be taken to ensure that there is no offset between the adjacent conductor track.
  • conductive surface connections to printed conductors and the printed conductors in the transition region to a conductive surface are made wide. Any lack of registration accuracy can thus be compensated, and non-circular shapes of the contact inserts facilitate a register-accurate connection.
  • a contact problem also arises due to the unavoidable gap between the contact insert and the surrounding contact layer on the outer circumference of the contact insert.
  • the bridge conductor element is at the point of transition between the guide surface and conductor opposite point of the neighboring layer attached, for example, by printing.
  • the two conductive structures conductor track and guide surface and connects them securely and permanently electrically together.
  • the end of the track corresponds hereby somewhat to the bridge track element. During hot lamination, the end of the track bridges the gap and connects to the guide surface.
  • further layers are laminated or laminated onto the layer structure composed of contact layer / central layer / further contact layer, typically at least one upper and one lower cover layer.
  • These film layers preferably also consist of a hot-laminatable material.
  • both contact elements have been formed as contact pads having a higher softening point or melting point than that of the surrounding contact layer.
  • the contact elements it is also possible to form only one of the contact elements as a contact insert and form the other (second) contact layer of a film that is not heat-laminatable, or at least not under the same conditions as the other films is heat-laminated, ie, a higher softening point than that first contact layer has, for example, a similar or identical softening point as the first contact insert.
  • the second contact layer can be made of the same material as the first contact insert, or of another material.
  • the region of the second contact layer lying opposite the first contact insert is an integral part of the second contact layer, hereinafter referred to as "contact zone".
  • the contact zone is equipped analogous to the contact insert with a guide surface or guide surfaces. A contact zone with a guide surface or with guide surfaces forms a contact element.
  • the alternative embodiment with integrated contact zone has advantages and disadvantages. Among the advantages is that the contact layers do not need to be recessed, no inserts made, and no need to fit the inserts. In addition, there are no electrical contact problems at the joint between the contact insert and the surrounding contact layer, and the conductor tracks can be applied in one operation with the guide surfaces.
  • the disadvantage of this embodiment is that the contact layer does not soften during hot lamination. As a result, the connection with the neighboring films is worse, and the security against manipulation is therefore not as optimal as in the previously described variant with two contact pads.
  • the neighboring films for example the central layer and a cover layer, one adhesive layer on each side of the contact layer with integrated contact zone is required in each case.
  • the material for the adhesive layers conventional hot melt adhesives are preferred. The combination of hot melt adhesive and bonding of the non-softening during hot lamination contact layer with a softening adjacent layer ensures sufficient connection strength and security against manipulation.
  • the other (first) contact layer is a contact insert whose connection to the neighboring layer, for example a cover layer, is in the best case just as good as the connection of the non-heat-laminatable contact layer to the neighboring layer, manipulation attempts by damage of the switching element are visible.
  • the adhesive layer is preferably applied over the whole area.
  • the adhesive layer can also be applied over the entire surface, provided that the guide surface is applied after the application of the adhesive. If the baffle is previously applied, at least the area of the baffle must be recessed when applying the adhesive. This can be achieved simply by providing the adhesive on the central layer to be bonded to the second contact layer.
  • the central layer has a recess in the region of the guide surface (s).
  • the contact inserts can be glued to their neighboring layer, wherein the adhesive can be provided only in the region of the insert or over the entire surface between the layers.
  • all film layers can be glued together, always making sure that the guide surfaces remain free of adhesive and electrically non-conductive adhesives are used, at least in the field of electrically conductive structures. Hot melt adhesives are preferred.
  • a typical layer structure of the laminated body with a pressure contact device consists of cover layer, first contact layer, central layer, second contact layer and further cover layer.
  • this layer may be a continuous layer without any interruptions.
  • the cover layer can be omitted at the second contact layer.
  • the layer structure described can be combined with other layers of plastic or other materials that are not limited in any particular way, depending on the intended use of the composite.
  • the baffle or baffles of a contact element are not applied in the form of a coating of conductive material prior to lamination of the foil layers, but the baffles are formed in the lamination process.
  • a contact insert of a contact layer or an integrated contact zone with recesses is provided, which form a Leit vom ceremoni ceremoni.
  • a conductor track structure is formed from an electrically conductive material, which is widened area in the region of the guide surface structure to be arranged above.
  • the electrically conductive material penetrates into the contact recesses (or a part of the contact recesses, depending on the configuration of the guide surfaces or guide surfaces), filling them, thereby forming the guide surface (s).
  • the shape of the contact recesses is in principle arbitrary, and for reasons of simplicity of manufacture, simple geometric formulas, such as circles or rectangles, are preferably selected.
  • the guide surface or, depending on the design of the switching arrangement according to the invention, the guide surfaces is / are composed of several Generalleit vom, due to the number of contact recesses in the contact element.
  • the contact recesses together form a "Leit perennialmatrix". If both contact elements of a switching element to be connected to tracks, the guide surface of a contact element has positive, the guide surface of the other contact element negative polarity. If only one contact element of a switching element is to be connected to printed conductors, the relevant contact element has two conductive surfaces of different polarity.
  • the electrically conductive material which is to form the conductive surface matrix is applied in the form of the largest possible area and can penetrate into the contact recesses of a contact insert or a contact zone.
  • the arrangement of the contact recesses here is largely arbitrary, and preferably the contact recesses are distributed over the entire surface of the contact element in order to ensure a large contact surface and thus a secure electrical contact. All sub-guidance surfaces of a matrix have the same polarity.
  • the electrically conductive material must here form two areas that do not touch, not even during hot lamination, and each area must be continued in a track. If the contact recesses of a contact insert or a contact zone are evenly distributed, some contact recesses may therefore remain unfilled in a central region. Alternatively, no contact recesses can be provided in the area between the poles. With two fins on a contact element one part of the sub-guide surfaces of the matrix has positive, the other negative polarity.
  • An advantage of the design of the fins in the form of a matrix is that no joints between the guide surface and the conductor can arise at the boundary between a contact insert and the surrounding contact layer.
  • only one of the contact elements of a switching element is formed as a Leit perennial mitogen. If both contact elements to receive Leit perennialmatrizen, the sectionleit perennial the first and the second contact element must be made very precisely matched to each other, so that upon the application of pressure on the contact sheets a clash is secured.
  • both contact elements are contact inserts, and it is particularly preferred to form one contact element as a conductive surface matrix, the other not, wherein the contact element is formed as a Leit vommatrix having at least one, and preferably two, connections to tracks.
  • a laminated body with a pressure contact device can be produced in the form of the desired individual elements, for example in the form of a card body of a chip card. Usually, however, it is produced in the form of a sheet material or an endless belt.
  • the plastic films which are to receive contact inlays become punched in the appropriate places, ie equipped with recesses in the form of contact inserts.
  • the required contact inserts are separated in the appropriate dimensions of a plastic film, wherein, if no Leit perennialmatrix is to be formed, before or after the separation of a coating with guide surfaces in the desired shape is made.
  • the coating of the plastic film with conductor tracks can be carried out before or after the punching, the coating with conductor tracks or with guide surfaces preferably taking place before the punching or before the separation of the contact inlays.
  • the perforations are each carried out several times, as usual, a sheet material is produced, and it will be carried out according to need more holes for receiving other functional elements such as chip modules. If a contact element is not formed as a contact insert but as an integral contact zone, a perforation for a contact insert is of course unnecessary in the relevant contact layer.
  • the plastic films for example a cover layer, a first contact layer, a central layer, a second contact layer and a further cover layer, are stacked on one another and in the process are fitted with the contact inserts and the required functional elements.
  • a snap element can be arranged, which changes its deformation state jerky during the switching process and thereby generates a tactile feedback of the switching operation.
  • the layer stack is fed to a laminating press, where the films are bonded under pressure and heat to form a laminate.
  • a suitable adhesive such as a hot melt adhesive
  • the other plastic films with a lower softening point soften during the hot lamination and inseparably combine with each other.
  • the contact elements do not soften during hot lamination, but reliably retain their shape and do not penetrate into the cavity formed between them.
  • the walls of the cavity are made of a heat-laminatable material, ie, the material of the low-softening-point central layer, it has been found that the material of the central layer does not soften so much that it penetrates into the cavity. Probably this is due to the relatively central location within the layer stack and the relatively short time during which the material is exposed to elevated pressure and temperature. In any case, the material of the central layer surprisingly remains so stable in the edge region surrounding the cavity that it does not penetrate into the cavity and at the same time supports the contact inserts on its outer circumference.
  • the width of the edge region on which a contact insert should rest on the central layer depends on the dimensions of the contact insert.
  • a guideline for the width of the edge area is for a circular contact insert about half the radius of the contact insert.
  • the contact insert should preferably be supported on its entire outer circumference of the central layer, ie rest on her.
  • an adhesive may be provided at least between the edge region of the contact insert and the central layer.
  • a contact element is formed as a guide surface matrix
  • the corresponding contact element is not, as stated above, coated with a guide surface, but it is equipped with contact recesses, which can for example be punched out or cut out by means of a laser.
  • an electrically conductive material is provided, which penetrates into the contact recesses during hot lamination and fills and thereby on the other surface of the contact pad or the contact zone, the guide surface or the Forms guide surfaces.
  • the coating with conductive material and the associated strip conductors is preferably carried out in one operation, for example by coating the film layer which adjoins the contact layer in the layer stack on the side facing away from the cavity.
  • All foils of a stack can be laminated together in one go.
  • partial layer stacks can also be laminated together and the partial layer stacks joined together in a further operation.
  • a laminate of a first cover layer and a first contact layer with a first contact insert as well as a laminate of a second cover layer and a second contact layer with a second contact insert could be produced, and These laminates are printed in each case with printed conductors and guide surfaces in one operation.
  • a central layer could be coated, e.g. printed, in the areas later facing the interfaces between fins and adjacent tracks, with bridgewire elements and then combined with the two sub-laminates into a stack and laminated.
  • one of the contact layers consists of a material with a higher softening point
  • this layer should be glued on its main surface to the neighboring layer, or in the case of two neighboring layers on both main surfaces, be glued to the neighboring layers.
  • Other layers of adhesive can be provided as desired, but are usually not required.
  • the laminated body After hot lamination, the laminated body is divided into the intended individual elements.
  • Fig. 1 shows as an example of an embodiment of the invention a section of a multi-layered card body 5 of a small-sized, portable data carrier in the form of a chip card with a switching element 2 in a sectional view.
  • the card body of the embodiment shown comprises a layer stack with five layers 3 laminated together.
  • the layers 3 are plastic films provided, but other materials come into consideration, such as paper, ceramic or metal or mixtures thereof with plastic.
  • Individual layers 3 can also be provided in another form, for example as an injection-molded element.
  • layers 3 is the - typical - according to Fig.1 around a central layer, on each of which a contact layer and a cover layer are applied on both sides.
  • a card body further layers, z. B. other cover layers.
  • the portable data carrier can be present in the form of a chip card in other portable designs, in particular in other card formats, such as SD card.
  • the switching element 2 consists of two, an upper and a lower - the information used in the following "top” and “bottom” refer to the figures and are only for better understanding -, contact elements, wherein the lower, first contact element as a contact insert 12th and the upper, second contact element is designed as a contact zone 25 integrated in the upper, second contact layer. By another shading, the integrated contact zone 25 is formally delimited from the second contact layer.
  • On the contact insert 12 and the contact zone 25 each electrically conductive contact surfaces are attached. Between the electrically conductive contact surfaces there is a cavity 33, which in the unactuated state, ie as long as no pressure is exerted on the switching element 2, the electrically conductive contact surfaces separates from each other.
  • the cavity 33 is bounded directly by the centrally located of the layers 3.
  • the switching element 2 is connected to a chip module 7.
  • the interconnect of the switching element 2 is completely in the lower level, which is why the lower, first contact element is designed in the form of two separate electrically conductive contact surface, each via a separate interconnect. 6 permanently electrically connected to the chip module 7.
  • the upper, second contact element has only a single, comparatively large, electrically conductive contact surface, from which no trace leads to the chip module 7. Electrically conductive contact surfaces and conductor tracks can be printed, for example, as coatings.
  • FIG. 2 shows a section of a card body 5 a smart card as in FIG. 1
  • the tracks 6 are now in different levels. Accordingly, each of the two contact elements via a conductor track 6 is permanently electrically connected to the chip module 7.
  • the electrically conductive contact surface is printed on the upper, second contact zone 25 in the form of a coating, while the electrically conductive contact surface on the lower, first contact insert 12 consists of a plurality of electrically conductive partial contact surfaces, which by filling contact recesses in the contact insert 12 with a conductive material have formed.
  • the filled with conductive material contact recesses are in FIG. 2 represented by another hatching.
  • FIG. 2 represents by another hatching.
  • the printed conductors 6 and the electrically conductive contact surfaces connected thereto can be continuous, ie without any interruptions. be formed.
  • a joint is formed technically between the contact insert 12 and the surrounding contact layer, the electrically conductive material for the conductor track 6 and the electrically conductive contact surface on the contact insert 12 can be applied jointly and continuously to the underlying adjacent foil layer 3 ,
  • FIGS. 3 to 9 show in each case in partial sectional views embodiments of the invention in laminates 1, which are shown as a layer stack 4.
  • the layers are exploded separately from each other.
  • the individual layers are connected in one or more steps by hot lamination to form a one-piece layered body 1, which can then be provided with further layers, for example by laminating.
  • the laminated body 1 may, for example, be a chip card, for example around the card body.
  • the illustrated laminates 1 each again have five plastic film layers, namely from bottom to top: a first cover layer 51, a first contact layer 10, a central layer 30, a second contact layer 20 and a second cover layer 50.
  • the number of foil layers is not binding.
  • the outer layers are not absolutely necessary, but advantageous, in particular if the otherwise outer layer is a foil with a contact insert.
  • other layers not shown in the figures may also be present.
  • Individual layers, such as the central layer 30, which is shown as a single layer in the figures, may also be internally composed of multiple layers.
  • laminated body 1 is the lower, first contact element as a contact pad 12 with a lower electrically conductive contact surface 17, and the upper, second contact element formed as a contact zone 25 with an upper, second electrically conductive contact surface 27; the two electrically conductive contact surfaces 17, 27 are referred to below as guide surfaces.
  • the contact insert 12 is received in a recess 16 of the lower first contact layer 10. Tracks 6 and lower guide surface 17 are suitably applied together, as printed.
  • the guide surfaces 17, 27 are again separated in the unactuated state by a cavity whose wall is formed by the central layer 30.
  • the gap 65 causes between the strip conductors 6 and the lower guide surface 17 tendentially forms a secondary joint or at least the potential for forming a joint is formed.
  • bridgework elements 61 are applied, for example printed. In the process of hot lamination, these bridge interconnect elements 61 permanently connect in an electrically conductive manner to the interconnects 6 on the one hand and the fins 17 on the other.
  • the first contact insert 12 has - along the in Fig. 3 shown cutting direction - a diameter D.
  • the central layer 30 has a recess with a diameter d - in the cutting direction.
  • the diameter d of the recess in the central layer 30 is smaller than the diameter D of Therefore, the lower, first contact insert 12 abuts against the central layer 30 in an edge region 31.
  • the boundary of the edge region 31 is indicated in the central layer 30 by a dashed line. In the region of the edge region 31, the lower, first contact insert 12 is supported by the central layer 30 during hot lamination.
  • the lower, first contact insert 12 and the upper, second contact layer 20 are made of a plastic material having a high softening temperature, which does not soften or at least almost not soften or deform at the selected H Dahllamin réelles counsel.
  • the central layer 30, the first contact layer 10, the first cover layer 51 and the second cover layer 50 are made of a material having a lower softening temperature which softens at the selected hot lamination conditions; When hot laminating two such layers together, a laminate is formed that is inseparably bonded. By contrast, in the case of hot lamination of a layer with a low softening temperature and a layer with a high softening temperature, a less good bond is achieved.
  • adhesive layers are provided between the film layers to be joined, such as the adhesive layers 40, 41 and 42 in FIG FIG. 3 .
  • the adhesive layer 41 which glues the central layer 30 and the second contact layer 20 together, has the same recess as the central layer 30.
  • the adhesive layer 42 is formed only part of the surface, wherein it is slightly larger in shape and dimensions than the lower, first contact pad 12.
  • the adhesive layer 40 which glues the second contact layer 20 and the second cover layer together, is formed over the entire surface.
  • FIG. 3a shows an oblique view from below against the upper, second contact layer 20 of the laminated body FIG. 3 in the area of the upper, second Contact zone 25.
  • the dot-dash line in FIG. 3a denotes the cutting plane in FIG. 3 .
  • the second guide surface 27 which is circular in this embodiment.
  • the "second contact zone 25" is not recognizable because it is an integral part of the second contact layer 20.
  • the term "contact zone” refers to only a portion of a contact layer that defines one side of the cavity 33 within the switching element;
  • the shape and dimensions of the contact zone 25 correspond by definition to the shape and dimensions of the recess 33 in the central layer 30.
  • FIGS. 3b and 3c show plan views obliquely from above on the lower, first contact layer 10 with the first contact element arranged therein and on the central layer 30 to be arranged above it; the dot-dash line in the FIGS. 3b and 3c denotes the cutting plane in FIG. 3 ,
  • the central layer 30 is shown transparent, so that the arranged on its underside bridge interconnect elements 61 and conductor tracks 6 are visible (shown with dotted lines).
  • the central layer 30 has in each case a recess 36 which has smaller dimensions in the direction of extent of the laminated body 1 than the first contact insert 12.
  • the recess 36 corresponds in its contour to the recess 16 in the lower, first contact layer 10, but is smaller in area, so that the contact pad 12 in the lower, first contact layer 10 rests on the central layer 30 when the layers are stacked on their entire outer circumference.
  • the lower, first contact insert 12 has a guide surface 17 in the form of two guide surface regions 17 ', 17 ", which are to be electrically conductively connected to conductor tracks 6.
  • the conductor tracks 6 are in this case in the same plane, which is why the contact insert 12 is in this plane is provided with two guide surface regions 17 ', 17 ", which are electrically connected to each other in contact with the second guide surface 27 of the second contact element.
  • the shape of the two baffle regions 17 ', 17 " is preferably selected such that a secure connection of the baffle regions 17', 17" is ensured even in the event of poor registration of the baffles 17, 27 of the lower, first contact element and the upper, second contact element ,
  • a comb-like shape has been selected, but this represents only one of many possibilities.
  • the guide surface regions 17 ', 17 "and the conductor tracks 6 are widened at the transition points 63.
  • any registration inaccuracies can be compensated for when inserting the contact insert 12 into the surrounding contact layer 10.
  • a technically related joint 65 which is in principle an electrical contact problem.
  • the central layer 30 is provided with bridge interconnect elements 61 of electrically conductive material at the locations which are opposite the junctions 63 in the finished layer stack. The bridge conductor elements 61 connect during the hot lamination with the conductors 6 on the one hand and the guide surfaces 17 ', 17 "on the other hand and ensure the electrical contact.
  • FIG. 4 shows a partial sectional view through a further embodiment of the invention.
  • the adhesive layer 42 under the first contact layer 10 is now formed over the entire surface and the interconnects 6 are applied in a plane on the second contact layer 20.
  • the contact element has correspondingly in the plane of the strip conductors 6 a guide surface with two separate guide surface regions 27 ', 27 ", which are each electrically conductively connected to a conductor track 6.
  • the other contact element has a guide surface 17 without any connection to conductor tracks 17 serves to connect the two guide surface regions 27 ', 27 "of the other contact element in an electrically conductive manner as soon as the guide surfaces 17 of the first contact element and the second contact element 27 are pressed against one another.
  • the lower, first contact element is designed as a contact insert 12 with a guide surface 17 thereon.
  • FIG. 4b shows an oblique view of the lower, first contact layer 10 with the contact pad 12 therein.
  • the dot-dash line indicates the cutting plane in FIG. 4
  • the contact pad 12 is substantially rectangular here.
  • the recesses in the central layer 30 and the adhesive layer 41 are of substantially rectangular shape, wherein the diameter d of the recess 36 in the central layer 30 in turn smaller is as the diameter D of the contact insert 12, so that the contact pad 12 in the edge region 31 of the central layer 30 rests on this and is supported in the hot lamination of her.
  • the presence of a joint 65 on the outer circumference of the contact insert 12 is not disturbing here, since the guide surface 17 has no connection to conductor tracks and therefore no contact problems occur.
  • the adhesive layer 42 also ensures a secure stationary fixation of the refractory contact insert 12.
  • the second contact element has two guide surfaces or a guide surface, which consists of two guide surface regions 27 ', 27 ".
  • the guide surface regions 27', 27" have the same geometric shape as the guide surface regions FIG. 3 , In the embodiment according to FIG. 4 However, the guide surface regions 27 ', 27 "represent, as it were, continuations of the conductor tracks 6.
  • the upper, second contact element is an integral part of the upper, second contact layer 20, ie the two guide surface regions 27', 27" are located on the second contact zone 25, which is an integral part of the second contact layer 20.
  • the formal delimitation of the second contact zone 25 is in FIG. 4 indicated by the dashed line.
  • baffles 27 ', 27 "and traces 6 can be easily applied as an uninterrupted coating, for example printed, since the upper, second contact layer 20 is a layer of a high-softening material It is therefore not softened during hot lamination, and is therefore adhesively bonded to the neighboring layers at its two main surfaces 23, 23 'by means of adhesive layers 40, 41.
  • the adhesive layer 41 has a recess in the region of the upper, second contact element, so that the two guide surface regions 27 ', 27 "should not be covered by adhesive.
  • the recess in the adhesive layer 41 corresponds in shape and size expedient of the recess in the central layer 30.
  • the adhesive layer 41 is first applied to the main surface 23 'of the second contact layer 20 and the printed conductors 6 and only subsequently the two conductive surface regions 27', 27 "are printed onto the adhesive layer 41. In this case, a recess of the adhesive layer 41 can be dispensed with.
  • FIG. 5 shows a partial sectional view of another embodiment of the invention.
  • all of the film layers shown are made of hot-laminatable materials, ie of materials having such a low softening temperature, that they soften under conventional hot lamination conditions and cohesively bond together. Adhesive layers are no longer necessary in this case and accordingly not provided.
  • the conductor tracks 6 are located in the same plane on the lower, first contact layer 10. Both contact elements of the switching element are in the embodiment according to Fig. 5 trained as contact deposits.
  • the lower, first contact element consisting of contact insert 12 and guide surface 17 with guide surface regions 17 ', 17 "establishes a connection to the conductor tracks 6, wherein the electrical contact is ensured by a bridge conductor element 61, as described with reference to FIGS Figures 3 and 3b has been described.
  • the upper, second contact element consisting of contact insert 22 and guide surface 27, is designed as in FIG. 4b shown for the lower, first contact element.
  • Contact insert 22 with guide surface 27 and surrounding second contact layer 20 are separated by a joint 66.
  • the two contact pads 12, 22 readily have different surface geometries, such as an oval and a rectangular, as long as it is ensured that an electrical contact between the respective guide surfaces of the lower, first and the upper, second contact element is produced.
  • the dimensions of the lower, first contact insert 12 in the cutting direction are larger than the dimensions of the upper, second contact insert 22 in the cutting direction.
  • the lower, first contact insert 12 therefore lies in a larger edge region 31 on the central layer 30 than the second contact insert 22.
  • the corresponding edge regions 31 and 32 are indicated in the central layer 30 by the dotted line.
  • the shape of the recess 36 in the central layer 30 expediently corresponds either to the shape of the lower, first contact insert 12 or the shape of the upper, second contact insert 22.
  • the dimensions of the recess 36 are smaller in the extension direction of the layered body 1 than the dimensions of the second contact insert 22.
  • a different strong resting on the central layer 30 of a contact insert at different peripheral regions of the contact insert, or a different levels of contact between two contact pads on the two sides of the central layer 30 is not harmful, as long as the contact pads are sufficiently supported by the central layer during hot lamination.
  • FIG. 6 shows a partial sectional view of another embodiment of the invention.
  • the lower, first contact element 11 is formed as a contact insert 12 in the lower, first contact layer 10, the upper, second contact element 21 as an integral contact zone 25 in the second contact layer 20.
  • the lower second contact layer 20 is made of a non-heat-laminatable material and is on glued to their two major surfaces by means of adhesive layers 40, 41 with the respective neighboring layers.
  • the adhesive layer 41 has a recess 46, which corresponds to the recess 36 in the central layer 30.
  • each of the contact elements 11, 21 each have a guide surface 17, 27, and each guide surface 17, 27 is connected to a conductor track 6.
  • Top views of the lower, first contact element 11 from above or on the upper, second contact element 21 from below are in the Figures 6a and 6b shown. The dotted lines indicate the cutting plane in each case FIG. 6 ,
  • FIG. 6a shows the lower, first contact layer 10 with the first contact pad 12 and the first guide surface 17 and the overlying central layer 30 with recess 36 and bridge conductor element 61.
  • the recess 36 in the central layer 30 is round, ie it has a different shape than the first Contact insert 12.
  • the shape of the recess 36 corresponds approximately to the shape of the guide surfaces 17 and 27.
  • the guide surfaces 17 and 27 of the lower, first and upper, second contact element are both designed over a large area, so that upon compression of the lower, first contact element 11 and the upper, second contact element 21 a secure electrical contact is ensured.
  • FIG. 6a shows the lower, first contact layer 10 with the first contact pad 12 and the first guide surface 17 and the overlying central layer 30 with recess 36 and bridge conductor element 61.
  • the recess 36 in the central layer 30 is round, ie it has a different shape than the first Contact insert 12.
  • the shape of the recess 36 corresponds approximately to the shape of the guide surfaces 17
  • the range of the upper, second guide surface 27 extends beyond the region of the upper second contact zone 25, that is, there is a poor registration between the lower, first contact element 11 and upper, second contact element 21.
  • the lower, second contact layer 20 is a continuous layer, ie has no contact insert, the lower, second guide surface 27 are applied together with the conductor 6 as a continuous coating, as seen from FIG. 6b is apparent.
  • the guide surfaces of the two contact elements have always been applied as coatings on mutually facing surfaces of the contact inserts or contact zones, for example printed.
  • recesses are provided in the relevant contact insert or contact zone, in which the electrically conductive material, which is located on the "wrong" side of the contact insert / contact zone, penetrates during the H Dahllamin istsvorgangs and thereby on the "right” side fins forms.
  • FIG. 7 shows a layer stack 4 with the H contemplatlaminierbaren film layers 51, 10, 30, 20 and 50.
  • the lower, first contact element 11 is formed as a contact insert in the lower, first contact layer 10, the upper, second contact element 21 as a contact insert in the upper, second contact layer 20.
  • the adhesive layers 42 and 43 are over the entire surface or partial area, formed.
  • the tracks 6 are in the same plane. Accordingly, one of the contact elements, in FIG. 7 the lower, first contact element 11, two baffles of different polarity, which are electrically connected upon closing of the contact by the guide surface 27 of the upper, second contact element 21.
  • the second contact element 21 may be formed, for example, analogous, as in FIG. 4b for a first contact element 11 is shown.
  • the lower, first contact element 11 of the laminated body is in this case in the FIGS. 7a and 7b obtained schematically shown.
  • the cover layer 51 is coated with an optional adhesive layer 42 and the conductive material 60 is applied thereon.
  • the electrically conductive material 60 forms two fin precursor regions. These precursor regions continue in the interconnects 6.
  • the lower, first contact insert 12 is placed on the guide surface precursor regions. It is surrounded by the lower, first contact layer 10, which in Figure 7a has been omitted for clarity.
  • the lower, first contact insert 12 has recesses 18, which in the example of Figure 7a have a rectangular shape and form a 3 X 3 matrix.
  • the recesses 18 may of course also have a different shape, for example, be round or oval, and be arranged geometrically in another way.
  • the layer stack 4 is subjected to a hot lamination process. Due to the heat and the increased pressure during hot lamination, the electrically conductive material 60 softens and penetrates into the contact recesses 18. The resting on the conductive material 60 contact recesses 18 are so filled with conductive material and form the guide surface or the guide surfaces of the lower, first contact element 11, wherein the guide surfaces composed of part-guide surfaces.
  • Fig. 7b shows in supervision a subsequent, finished, embedded in the lower, first contact layer 10, lower contact insert 12. Those recesses 18 which were arranged in the hot lamination over electrically conductive material 60 are completely filled with electrically conductive material and form the partial fins 17 'and 17 "(in FIG. 7b hatched).
  • the guide surface 27 of the upper, second contact element 21 is designed such that it can simultaneously touch at least one of the partial guide surfaces 17 'and at least one of the partial guide surfaces 17 ".
  • FIG. 8 shows in partial sectional view a variant of the embodiment according to Fig. 7 ,
  • the layer stack is in Fig. 8 in comparison 3 to 7 in reverse order.
  • the embodiment according to Fig. 8 differs from the variant according to FIG. 7 essentially in that the lower, second contact layer 20 over the entire surface consists of a non-heat-laminatable plastic material, ie a plastic material with a relatively high softening temperature. Accordingly, there is also an additional adhesive layer 41 between the lower, second contact layer 20 and the central layer 30.
  • the lower, second contact element 21 has part-guide surfaces 27 'and 27 ", which are each formed by conductive Material 60, which is located on the adhesive layer 40, penetrates into contact recesses 28 of the second contact element and fills the recesses completely, so that at the upper, second guide surface 17 facing surface of the lower second contact element 21 partial guide surfaces 27 ', 27 " are formed, which are at least as far planar with the other surface areas of the contact element, that they can be easily contacted by the upper, first guide surface 17 and an electrical contact between the conductor tracks 6 can be made also slightly beyond the surface of the lower, second contact layer 20 survive.
  • FIG. 8a 2 shows in oblique view a finished lower contact insert 21 formed in the lower, second contact layer 20.
  • the partial contact surfaces 27 'and 27 are hatched, since the lower, second contact element 21 is an integral component (contact zone) of the lower, second contact layer 20 is formed, formed between the lower contact layer 20 and the lower, second contact insert no joint
  • FIG. 9 shows in partial sectional view a further embodiment of the invention.
  • the conductor tracks 6 are in different planes. Accordingly, the contact elements each have a guide surface which is connected to a conductor track 6.
  • the upper, second contact element as an integral contact zone 25 with imprinted guide surface 27.
  • the formal delimitation of the upper, second contact element from the remaining upper, second contact layer 20 with high softening temperature is through indicated by a dashed line.
  • FIG. 9a is a representation analogous to Figure 7a , The dash-dotted lines again indicate the cutting plane in FIG. 9 at. Deviating from Figure 7a is in the embodiment according to FIG. 9a the conductive material 60 is applied to the coversheet 51 as a single large area continuing in a trace 6. In the case of hot lamination, in this way all contact recesses 18 in the lower, first contact insert 12 are filled and at least coplanar part-conducting surfaces 17 are formed with the surface of the contact insert 12. How out FIG. 9 As can be seen, the joint 65 between lower, first contact pad 12 and lower, first contact layer 10 does not interfere, since the electrically conductive material 60 is applied as a continuous layer on the film 51. A high precision in the application is not required. For example, beyond the first contact insert 12 also reaching electrically conductive material 60 does not disturb. It is also not annoying when electrically conductive material 60 penetrates into the joints between the lower contact pad and the surrounding lower contact layer.
  • the upper, second contact element is formed as well as in FIG. 6b shown.
  • the support for the central layer 30 during hot lamination is the same as for the contact liner printed with the guide surface.
  • the contact inserts must overlap with the central layer 30 in a sufficiently wide edge region.
  • the foils of the laminated body must be sufficiently elastic that the first and the second contact element can be brought into contact with one another by exerting pressure on the laminate in the area of the contact elements, and return to their original position upon termination of the pressure application.
  • the above-described solution is particularly suitable for use in card-shaped, portable data carriers, for example in the form of chip cards.
  • By simultaneously forming a plurality of switching elements can be formed in particular a keyboard.
  • the laminates are preferably produced as a sheet or strip material, from which the desired individual elements, so about chip cards are cut out.

Landscapes

  • Laminated Bodies (AREA)
  • Manufacture Of Switches (AREA)
EP10015933.4A 2010-01-19 2010-12-22 Corps en couche pouvant être laminé à chaud et doté d'au moins un élément de commutation électrique Active EP2346058B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102010004994 2010-01-19

Publications (3)

Publication Number Publication Date
EP2346058A2 true EP2346058A2 (fr) 2011-07-20
EP2346058A3 EP2346058A3 (fr) 2012-09-12
EP2346058B1 EP2346058B1 (fr) 2016-09-14

Family

ID=43836621

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10015933.4A Active EP2346058B1 (fr) 2010-01-19 2010-12-22 Corps en couche pouvant être laminé à chaud et doté d'au moins un élément de commutation électrique

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Country Link
EP (1) EP2346058B1 (fr)
DE (1) DE102010055705A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013110416A1 (fr) * 2012-01-24 2013-08-01 Robert Bosch Gmbh Module de commande de boîte de vitesses pourvu de pistes conductrices résistant à l'huile
EP2743952B1 (fr) 2012-12-17 2015-09-16 Oberthur Technologies Contacteur pour carte plastique mince

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10339052A1 (de) 2003-08-25 2005-03-24 Giesecke & Devrient Gmbh Verfahren zur Herstellung einer Anordnung mit wenigstens einem elekrischen Schaltelement

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4558427A (en) * 1982-03-03 1985-12-10 Casio Computer Co., Ltd. Sheet-like compact electronic equipment
DE19935528A1 (de) * 1999-07-28 2001-02-08 Giesecke & Devrient Gmbh Tastschalter für Chipkarten
EP1429356A1 (fr) * 2002-12-09 2004-06-16 IEE INTERNATIONAL ELECTRONICS & ENGINEERING S.A. Element de commutation en feuille avec une couche diélectrique

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10339052A1 (de) 2003-08-25 2005-03-24 Giesecke & Devrient Gmbh Verfahren zur Herstellung einer Anordnung mit wenigstens einem elekrischen Schaltelement

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013110416A1 (fr) * 2012-01-24 2013-08-01 Robert Bosch Gmbh Module de commande de boîte de vitesses pourvu de pistes conductrices résistant à l'huile
EP2743952B1 (fr) 2012-12-17 2015-09-16 Oberthur Technologies Contacteur pour carte plastique mince
EP2743952B2 (fr) † 2012-12-17 2018-09-12 Oberthur Technologies Contacteur pour carte plastique mince

Also Published As

Publication number Publication date
EP2346058A3 (fr) 2012-09-12
DE102010055705A1 (de) 2011-07-21
EP2346058B1 (fr) 2016-09-14

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