EP0212252A2 - Manufacturing process for a membrane key switch, and membrane key switch - Google Patents

Manufacturing process for a membrane key switch, and membrane key switch Download PDF

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Publication number
EP0212252A2
EP0212252A2 EP86109715A EP86109715A EP0212252A2 EP 0212252 A2 EP0212252 A2 EP 0212252A2 EP 86109715 A EP86109715 A EP 86109715A EP 86109715 A EP86109715 A EP 86109715A EP 0212252 A2 EP0212252 A2 EP 0212252A2
Authority
EP
European Patent Office
Prior art keywords
printed
carrier
spacer
film
cover film
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.)
Withdrawn
Application number
EP86109715A
Other languages
German (de)
French (fr)
Other versions
EP0212252A3 (en
Inventor
Winfried Hormes
Günter Dipl.-Ing. Tessendorf
Eberhard Lendle
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.)
Schoeller and Co Elektrotecnische Fabrik GmbH and Co
Original Assignee
Schoeller and Co Elektrotecnische Fabrik GmbH and Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Schoeller and Co Elektrotecnische Fabrik GmbH and Co filed Critical Schoeller and Co Elektrotecnische Fabrik GmbH and Co
Publication of EP0212252A2 publication Critical patent/EP0212252A2/en
Publication of EP0212252A3 publication Critical patent/EP0212252A3/en
Withdrawn legal-status Critical Current

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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
    • 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
    • H01H13/703—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 characterised by spacers between contact carrying layers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2209/00—Layers
    • H01H2209/02—UV or light sensitive
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2211/00—Spacers
    • H01H2211/006—Individual areas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2227/00—Dimensions; Characteristics
    • H01H2227/002—Layer thickness
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2227/00—Dimensions; Characteristics
    • H01H2227/002—Layer thickness
    • H01H2227/01—Adhesive
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2227/00—Dimensions; Characteristics
    • H01H2227/018—Printed contacts; Metal foil
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2227/00—Dimensions; Characteristics
    • H01H2227/024—Spacer elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2227/00—Dimensions; Characteristics
    • H01H2227/028—Key stroke
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2229/00—Manufacturing
    • H01H2229/002—Screen printing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2229/00—Manufacturing
    • H01H2229/012—Vacuum deposition
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2229/00—Manufacturing
    • H01H2229/024—Packing between substrate and membrane
    • H01H2229/028—Adhesive
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2229/00—Manufacturing
    • H01H2229/038—Folding of flexible printed circuit

Definitions

  • the invention relates to a method for producing a membrane switch, in which at least one spacer layer of insulating varnish is printed on a carrier on the conductor, whereby a distance between the conductors of the carrier and conductors of a cover film is created and switching chambers are left in which the conductors face each other .
  • the invention further relates to a membrane key switch.
  • the carrier and the cover film are made of different materials in DE-OS 33 16 616.
  • the spacing layers In order to achieve a desired distance, the spacing layers must either be correspondingly thick or correspondingly numerous, so that a correspondingly large number of printing processes are necessary for larger distances.
  • the film switch according to DE-PS 29 02 769 consists of a film folded around an intermediate layer and glued to this.
  • the object of the invention is to propose a method of the type mentioned in the introduction, in which the number of printing processes is reduced and secure fastening of the cover film is achieved.
  • Another object of the invention is to propose a corresponding membrane key switch.
  • the above object is achieved in a method of the type mentioned at the outset in that the spacer layer or the spacer layers are simultaneously printed on the conductor track side in one or more successive printing steps on the carrier and the cover film as parts of a single film provided with conductor tracks then an adhesive layer in the top spacer layer above the carrier film part and / or the cover film part Surrounding the switching chambers is applied and that then one film part is folded onto the other film part, so that the adhesive layer connects the mutually facing spacer layers.
  • the adhesive layer is also printed on. It is sufficient if it is printed over the carrier film part or the cover film part. It does not have to cover the entire spacer layer, but can also extend in a pattern between the interrupters, the area of which is smaller than that of the spacer layers.
  • the adhesive layer is preferably applied in such a way that it is spaced apart from the switching chambers. It is then also inaccuracies when printing the adhesive layer avoided that glue gets into the interrupters.
  • a membrane key switch according to the invention is characterized in that two foils of the same thickness, printed with conductor tracks and spacer layers of the same thickness, are glued to one another at their spacer layers.
  • the conductor tracks 2 and 4 can be applied by conventional methods. In the case of vapor deposition, they have a thickness of approximately 0.5 ⁇ m to 2 ⁇ m. When using conductive silver substrates that can be screen-printed, a thickness of 10 ⁇ m to 15 ⁇ m is achieved.
  • a first spacer layer 6 made of insulating varnish is printed on the plastic film 1 and over the conductor tracks 2 and 4 in a single printing process, in particular in screen printing.
  • the spacer layer 6 leaves ends of the conductor tracks 2 and 4 free. These are located in cylindrical subchambers 7 and 8 which are free of spacer layers.
  • the spacer layer 6 also leaves open a folding area 9 of the film 1.
  • a second spacer layer 10 made of the same insulating varnish is then printed on the spacer layer 6. This leaves the same areas 7, 8, 9 free as the spacer layer 6.
  • Each of the spacer layers 6 and 10 has a thickness between 20 ⁇ m and 40 ⁇ m.
  • the thickness of the adhesive layer 11 is between 20 ⁇ m and 40 ⁇ m.
  • the adhesive layer 11 also leaves the partial chamber 7 free. It preferably does not extend to the edge of the partial chamber 7 in order to prevent adhesive from penetrating into the partial chamber 7 if there are tolerances in the printing process.
  • an adhesive which does not harden during the intermediate storage and can only be activated after the intermediate storage.
  • adhesives that can be activated by UV radiation are known.
  • the cover film area 5 is folded over the line 12 perpendicular to the plane of the drawing in the direction of the arrow P.
  • the region 13 of the spacer layer 10 lying above the cover film region 5 comes into contact with the adhesive layer 11, so that the region 13 of the spacer layer 10 is connected by means of the adhesive layer 11 to the region 14 of the spacer layer 10 lying above the carrier film region 3.
  • the subchambers 7 and 8 are aligned and form the switching chambers 15, of which only one is shown in FIG. 2 and in which the ends of the conductor tracks 2 and 4 face each other (cf. FIG. 2).
  • distances between 110 pm and 190 pm can be achieved. If larger distances between the carrier film region 3 and the cover film region 5 are desired, more than two spacer layers can also be provided. It is always favorable that the thickness of each printed spacer layer has a double effect on the distance between the carrier film region 3 and the cover film region 5.

Landscapes

  • Push-Button Switches (AREA)

Abstract

In a process for manufacturing a membrane key switch, at least one spacer layer of dielectric varnish is printed on. In order to reduce the number of printing processes at greater intervals and to achieve secure attachment of the membrane, the spacer layer or layers is/are printed onto the carrier and the covering membrane as parts of a single membrane, provided with conductor paths. Subsequently, an adhesive coating is applied, after which the membrane parts are folded on top of one another.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung eines Folientastschalters, bei dem auf einen Träger auf dessen Leiter wenigstens eine Abstandsschicht aus Isolationslack aufgedruckt wird, wodurch ein Abstand zwischen den Leitern des Trägers und Leitern einer Deckfolie entsteht und Schaltkammern freigelassen werden, in denen sich die Leiter gegenüberstehen. Weiterhin betrifft die Erfindung eine Folientastschalter.The invention relates to a method for producing a membrane switch, in which at least one spacer layer of insulating varnish is printed on a carrier on the conductor, whereby a distance between the conductors of the carrier and conductors of a cover film is created and switching chambers are left in which the conductors face each other . The invention further relates to a membrane key switch.

Ein derartiges Verfahren ist in der DE-OS 33 16 616 beschrieben. Dort werden Abstandsschichten kreisringförmig um die Schaltkammern gedruckt. Über die Abstandsschicht wird die Deckfolie gelegt. Die zu deren Befestigung zur Verfügung stehende Fläche ist auf einen Teil der kreisringförmigen Abstandsschicht begrenzt, wenn sie im unbelasteten Zustand plan verlaufen soll. Sie schwebt weitgehend über der Grundplatte. Die Befestigung der Deckfolie ist dadurch problematisch.Such a method is described in DE-OS 33 16 616. Spacer layers become circular there printed around the interrupters. The cover film is placed over the spacer layer. The area available for fastening is limited to a part of the annular spacer layer if it is to run flat in the unloaded state. It hovers largely over the base plate. The attachment of the cover film is therefore problematic.

Der Träger und die Deckfolie bestehen bei der DE-OS 33 16 616 aus verschiedenen Materialien. Um einen gewünschten Abstand zu erreichen, müssen die Abstandsschichten entweder entsprechend dick oder entsprechend zahlreich sein, so daß bei größeren Abständen entsprechend viele Druckvorgänge nötig sind. Der Folienschalter nach der DE-PS 29 02 769 besteht aus einer um eine Zwischenschicht gefaltete und mit dieser verklebten Folie.The carrier and the cover film are made of different materials in DE-OS 33 16 616. In order to achieve a desired distance, the spacing layers must either be correspondingly thick or correspondingly numerous, so that a correspondingly large number of printing processes are necessary for larger distances. The film switch according to DE-PS 29 02 769 consists of a film folded around an intermediate layer and glued to this.

Aufgabe der Erfindung ist es, ein Verfahren der eingangs genannten Art vorzuschlagen, bei dem die Anzahl der Druckvorgänge reduziert ist und eine sichere Befestigung der Deckfolie erreicht wird. Weiter ist es Aufgabe der Erfindung, einen entsprechenden Folientastschalter vorzuschlagen.The object of the invention is to propose a method of the type mentioned in the introduction, in which the number of printing processes is reduced and secure fastening of the cover film is achieved. Another object of the invention is to propose a corresponding membrane key switch.

Erfindungsgemäß ist obige Aufgabe bei einem Verfahren der eingangs genannten Art dadurch gelöst, daß auf den Träger und die Deckfolie als Teile einer einzigen mit Leiterbahnen versehenen Folie die Abstandsschicht bzw. die Abstandsschichten gleichzeitig in einem bzw. mehreren aufeinanderfolgenden Druckschritten auf die Leiterbahnenseite aufgedruckt werden, daß anschließend auf die oberste Abstandsschicht über dem Trägerfolienteil und/ oder dem Deckfolienteil eine Kleberschicht in der Umgebung der Schaltkammern aufgebracht wird und daß danach das eine Folienteil auf das andere Folienteil geklappt wird, so daß die Kleberschicht die einander dann zugewandten Abstandsschichten verbindet.According to the invention, the above object is achieved in a method of the type mentioned at the outset in that the spacer layer or the spacer layers are simultaneously printed on the conductor track side in one or more successive printing steps on the carrier and the cover film as parts of a single film provided with conductor tracks then an adhesive layer in the top spacer layer above the carrier film part and / or the cover film part Surrounding the switching chambers is applied and that then one film part is folded onto the other film part, so that the adhesive layer connects the mutually facing spacer layers.

Dadurch ist erreicht, daß mit einem einzigen Druckvorgang bei zusammengeklappter Folie ein Abstand zwischen dem Trägerfolienteil und dem Deckfolienteil geschaffen wird der doppelt so groß ist wie die Abstandsschicht, wobei noch die Dicke der Kleberschicht hinzu kommt. Außerdem ist damit eine bis auf die Schaltkammern im wesentlichen vollflächige Verbindung des Deckfolienteils und des Trägerfolienteils bzw, deren Abstandsschichten erreicht. Ein Ablösen der Deckfolie ist dabei sicher vermieden. Außerdem ist die Deckfolie bis auf die Schaltkammern gegenüber dem Trägerfolienteil abgestützt. Sie kann dadurch in den Bereichen zwischen den Schaltkammern nicht zum Durchhängen neigen.It is thereby achieved that a distance between the carrier film part and the cover film part is created with a single printing process with the film folded, which distance is twice as large as the spacing layer, with the thickness of the adhesive layer also being added. In addition, a connection of the cover film part and the carrier film part, or the spacer layers of which, essentially over the entire area, is achieved, except for the switching chambers. Detachment of the cover film is certainly avoided. In addition, the cover film is supported up to the switching chambers with respect to the carrier film part. As a result, it cannot tend to sag in the areas between the interrupters.

In bevorzugter Ausgestaltung der Erfindung wird auch die Kleberschicht aufgedruckt. Es genügt, wenn sie über dem Trägerfolienteil oder dem Deckfolienteil aufgedruckt wird. Sie muß nicht die gesamte Abstandsschicht abdecken, sondern kann sich auch in einem Muster zwischen den Schaltkammern erstrecken, dessen Fläche kleiner ist als die der Abstandsschichten.In a preferred embodiment of the invention, the adhesive layer is also printed on. It is sufficient if it is printed over the carrier film part or the cover film part. It does not have to cover the entire spacer layer, but can also extend in a pattern between the interrupters, the area of which is smaller than that of the spacer layers.

Vorzugsweise ist die Kleberschicht so aufgebracht, daß sie von den Schaltkammern beabstandet ist. Es ist dann auch bei Ungenauigkeiten beim Aufdrucken der Kleberschicht vermieden, daß Kleber in die Schaltkammern gelangt.The adhesive layer is preferably applied in such a way that it is spaced apart from the switching chambers. It is then also inaccuracies when printing the adhesive layer avoided that glue gets into the interrupters.

Ein erfindungsgemäßer Folientastschalter zeichnet sich dadurch aus, daß zwei gleich dicke, mit Leiterbahnen und gleich dicken Abstandsschichten bedruckte Folien an ihren Abstandsschichten miteinander verklebt sind.A membrane key switch according to the invention is characterized in that two foils of the same thickness, printed with conductor tracks and spacer layers of the same thickness, are glued to one another at their spacer layers.

Günstig ist auch, daß zwischen der Trägerfolie und der Deckfolie nur eine einzige Kleberschicht nötig ist, wogegen in den Fällen, in denen die Abstandsschicht von einer zusätzlichen Folie gebildet ist, zwei Kleberschichten erforderlich sind. Vorteilhaft wirkt sich auch aus, daß durch das Umklappen der Folie nach dem gleichzeitigen Druck der Abstandsschichten auf einfache Weise eine richtige Zuordnung der Trägerfolie oder der Deckfolie erreicht ist.It is also favorable that only a single adhesive layer is required between the carrier film and the cover film, whereas in the cases in which the spacer layer is formed by an additional film, two adhesive layers are required. It also has an advantageous effect that by folding the film over after the simultaneous printing of the spacer layers, a correct assignment of the carrier film or the cover film is achieved in a simple manner.

Weitere vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den weiteren Unteransprüchen und der folgenden Beschreibung eines Ausführungsbeispiels. In der Zeichnung zeigen:

  • Figur 1 eine Folie nach dem Bedrucken, bestehend aus Trägerfolienteil und Deckfolienteil und
  • Figur 2 die Folie zu einem Folientastschalter zusammengeklappt.
Further advantageous embodiments of the invention result from the further subclaims and the following description of an exemplary embodiment. The drawing shows:
  • Figure 1 shows a film after printing, consisting of carrier film part and cover film part and
  • Figure 2 folded the film to a membrane switch.

Eine einzige elektrisch isolierende, flexible Kunststofffolie 1 einer Dicke zwischen 50 um und 190 pm, von der in der Zeichnung nur ein Ausschnitt gezeigt ist, wird mit Leiterbahnen 2 im Trägerfolienbereich 3 und mit Leiterbahnen 4 im Deckfolienbereich 5 versehen. Die Leiterbahnen 2 und 4 können nach üblichen Verfahren aufgebracht werden. Bei einem Aufdampfen haben sie etwa eine Dicke von 0,5 µm bis 2 µum. Bei der Verwendung von siebdruckfähigen Leitsilbersubstraten wird eine Dicke von 10 µm bis 15 µm erreicht.A single electrically insulating, flexible plastic film 1 with a thickness between 50 μm and 190 μm, of which only a section is shown in the drawing, is provided with conductor tracks 2 in the carrier film region 3 and with conductor tracks 4 in the cover film region 5. The conductor tracks 2 and 4 can be applied by conventional methods. In the case of vapor deposition, they have a thickness of approximately 0.5 µm to 2 µm. When using conductive silver substrates that can be screen-printed, a thickness of 10 µm to 15 µm is achieved.

Auf die Kunststoffolie 1 und über die Leiterbahnen 2 und 4 ist in einem einzigen Druckvorgang, insbesondere im Siebdruck, eine erste Abstandsschicht 6 aus Isolationslack aufgedruckt. Die Abstandsschicht 6 läßt Enden der Leiterbahnen 2 und 4 frei. Diese liegen in abstandsschichtfreien zylindrischen Teilkammern 7 und 8. Außerdem läßt die Abstandsschicht 6 auch einen Umklappbereich 9 der Folie 1 frei. Auf die Abstandsschicht 6 ist anschließend eine zweite Abstandsschicht 10 aus dem gleichen Isolationslack aufgedruckt. Diese läßt die gleichen Bereiche 7, 8, 9 frei, wie die Abstandsschicht 6. Jede der Abstandsschichten 6 und 10 hat eine Dicke zwischen 20 um und 40 µm.A first spacer layer 6 made of insulating varnish is printed on the plastic film 1 and over the conductor tracks 2 and 4 in a single printing process, in particular in screen printing. The spacer layer 6 leaves ends of the conductor tracks 2 and 4 free. These are located in cylindrical subchambers 7 and 8 which are free of spacer layers. In addition, the spacer layer 6 also leaves open a folding area 9 of the film 1. A second spacer layer 10 made of the same insulating varnish is then printed on the spacer layer 6. This leaves the same areas 7, 8, 9 free as the spacer layer 6. Each of the spacer layers 6 and 10 has a thickness between 20 μm and 40 μm.

Nach dem Aufdrucken der Abstandsschicht 10 und deren Austrocknen wird auf die Abstandsschicht 10 im Bereich über dem Trägerfolienbereich 3 eine Kleberschicht 11 aus einem Acrylat-Kleber, ebenfalls im Siebdruckverfahren, aufgedruckt. Die Dicke der Kleberschicht 11 liegt zwischen 20 um und 40 um.After the spacer layer 10 has been printed on and has dried out, an adhesive layer 11 made of an acrylate adhesive, likewise in the screen printing process, is printed on the spacer layer 10 in the region above the carrier film region 3. The thickness of the adhesive layer 11 is between 20 µm and 40 µm.

Die Kleberschicht 11 läßt ebenfalls die Teilkammer 7 frei. Vorzugsweise reicht sie nicht bis an den Rand der Teilkammer 7, um bei Toleranzen im Druckverfahren ein Eindringen von Kleber in die Teilkammer 7 zu vermeiden.The adhesive layer 11 also leaves the partial chamber 7 free. It preferably does not extend to the edge of the partial chamber 7 in order to prevent adhesive from penetrating into the partial chamber 7 if there are tolerances in the printing process.

Soll die mit den Abstandsschichten 6 und 10 und der Kleberschicht 11 bedruckte Folie 1 zwischengelagert werden, wird ein Kleber verwendet, der bei der Zwischenlagerung nicht aushärtet und sich erst nach der Zwischenlagerung aktivieren läßt. Es sind beispielsweise durch UV-Strahlung aktivierbare Kleber bekannt.If the film 1 printed with the spacer layers 6 and 10 and the adhesive layer 11 is to be stored temporarily, an adhesive is used which does not harden during the intermediate storage and can only be activated after the intermediate storage. For example, adhesives that can be activated by UV radiation are known.

Nach dem Aufbringen der Kleberschicht 11 bzw, deren Aktivierung, wird der Deckfolienbereich 5 um die zur Zeichenebene senkrechte Linie 12 in Richtung des Pfeiles P umgeklappt. Dabei kommt der über dem Deckfolienbereich 5 liegende Bereich 13 der Abstandsschicht 10 in Kontakt mit der Kleberschicht 11, so daß mittels der Kleberschicht 11 der Bereich 13 der Abstandsschicht 10 mit dem über dem Trägerfolienbereich 3 liegenden Bereich 14 der Abstandsschicht 10 verbunden ist. Die Teilkammern 7 und 8 fluchten dabei und bilden die Schaltkammern 15, von denen in Figur 2 nur eine gezeigt ist und in welchen sich die Enden der Leiterbahnen 2 und 4 gegenüberstehen (vgl. Figur 2).After the application of the adhesive layer 11 or its activation, the cover film area 5 is folded over the line 12 perpendicular to the plane of the drawing in the direction of the arrow P. The region 13 of the spacer layer 10 lying above the cover film region 5 comes into contact with the adhesive layer 11, so that the region 13 of the spacer layer 10 is connected by means of the adhesive layer 11 to the region 14 of the spacer layer 10 lying above the carrier film region 3. The subchambers 7 and 8 are aligned and form the switching chambers 15, of which only one is shown in FIG. 2 and in which the ends of the conductor tracks 2 and 4 face each other (cf. FIG. 2).

Wird nach der Montage des so hergestellten Folientastschalters in Richtung des Pfeiles F (vgl. Figur 2) im Bereich der Schaltkammer 15 auf die Deckfolie 5 gedrückt, dann kontaktieren sich die Enden der Leiterbahnen 2 und 4. In den Bereichen in der Umgebung der Schaltkammer 15 läßt sich der Deckfolienbereich 5 nicht auf den Trägerfolienbereich 3 drücken, da dies die Abstandsschichten 6 und 10 verhindern. Es können sich dementsprechend dort die Leiterbahnen 2 und 4 nicht unerwünscht kontaktieren. Die Möglichkeiten der Führung der Leiterbahnen 2 und 4 im Trägerfolienbereich 3 und im Deckfolienbereich 5 sind dadurch frei gestaltbar.Will after mounting the membrane switch in the direction of arrow F (see FIG. 2) in the Area of the switching chamber 15 pressed onto the cover film 5, then the ends of the conductor tracks 2 and 4 contact each other. In the areas in the vicinity of the switching chamber 15, the cover film area 5 cannot be pressed onto the carrier film area 3, since this prevents the spacer layers 6 and 10 . Accordingly, conductor tracks 2 and 4 cannot contact one another there undesirably. The possibilities of guiding the conductor tracks 2 and 4 in the carrier film area 3 and in the cover film area 5 can thus be freely designed.

Bei dem so hergestellten Folientastschalter (vgl. Figur 2) liegen folgende Schichten übereinander:

  • Auf dem Trägerfolienbereich 3 der Bereich 16 der Abstandsschicht 6, darauf der Bereich 14 der Abstandsschicht 10, darauf die Kleberschicht 11, darauf der Bereich 13 der Abstandsschicht 10, darauf der Bereich 17 der Abstandsschicht 6, darauf der Deckfolienbereich 5, wobei in die Bereiche 16 und 17 die Leiterbahnen 2 bzw. 4 eingebettet sind.
In the membrane key switch thus produced (see FIG. 2), the following layers lie one above the other:
  • On the carrier film region 3, the region 16 of the spacer layer 6, thereon the region 14 of the spacer layer 10, thereon the adhesive layer 11, thereon the region 13 of the spacer layer 10, thereon the region 17 of the spacer layer 6, thereon the cover film region 5, with regions 16 and 17 the conductor tracks 2 and 4 are embedded.

Beim beschriebenen Ausführungsbeispiel lassen sich Abstände zwischen 110 pm und 190 pm erreichen. Wenn größere Abstände zwischen dem Trägerfolienbereich 3 und dem Deckfolienbereich 5 erwünscht sind, lassen sich auch mehr als zwei Abstandsschichten vorsehen. Günstig ist dabei immer, daß die Dicke jeder gedruckten Abstandsschicht sich auf den Abstand zwischen dem Trägerfolienbereich 3 und dem Deckfolienbereich 5 doppelt auswirkt.In the described embodiment, distances between 110 pm and 190 pm can be achieved. If larger distances between the carrier film region 3 and the cover film region 5 are desired, more than two spacer layers can also be provided. It is always favorable that the thickness of each printed spacer layer has a double effect on the distance between the carrier film region 3 and the cover film region 5.

Claims (7)

1. Verfahren zur Herstellung eines Folientastschalters, bei dem auf einen Träger auf dessen Leiter wenigstens eine Abstandsschicht aus Isolationslack aufgedruckt wird, wodurch ein Abstand zwischen dem Leiter des Trägers und Leitern einer Deckfolie entsteht und Schaltkammern freigelassen werden, in denen sich die Leiter gegenüberstehen, dadurch gekennzeichnet, daß auf den Träger und die Deckfolie als Teile einer einzigen, mit Leiterbahnen versehenen Folie (1) die Abstandsschicht bzw. die Abstandsschichten (6, 10) gleichzeitig in einem bzw. mehreren aufeinanderfolgenden Druckschritten auf die Leiterbahnseite aufgedruckt werden, daß anschließend auf die oberste Abstandsschicht (10) über dem Trägerfolienteil (3) und/oder dem Deckfolienteil (5) eine Kleberschicht (11) in der Umgebung der Schaltkammern aufgebracht wird und daß danach das eine Folienteil auf das andere Folienteil geklappt wird, so daß die Kleberschicht die einander dann zugewandten Abstandsschichten verbindet.1. A method for producing a membrane switch, in which at least one spacer layer of insulating varnish is printed on a carrier on the conductor, thereby creating a distance between the conductor of the carrier and conductors of a cover film and switching chambers are released, in which the conductors face each other, thereby characterized in that the spacer layer or the spacer layers (6, 10) are simultaneously printed on the conductor track side in one or more successive printing steps on the carrier and the cover film as parts of a single film (1) provided with conductor tracks, and then on the uppermost spacer layer (10) over the carrier film part (3) and / or the cover film part (5) an adhesive layer (11) is applied in the vicinity of the switching chambers and that then the one film part is folded onto the other film part, so that the adhesive layer the each other then facing spacer layers connects. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Kleberschicht aufgedruckt wird.2. The method according to claim 1, characterized in that the adhesive layer is printed. 3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Kleberschicht von den Schaltkammern beabstandet aufgebracht wird.3. The method according to claim 1 or 2, characterized in that the adhesive layer is applied spaced from the switching chambers. 4. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß ein nach dem Auftrag aktivierbarer Kleber verwendet wird.4. The method according to any one of the preceding claims, characterized in that an adhesive which can be activated after the application is used. 5. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß jede der Abstandsschichten dicker als die Leiterbahnen aufgedruckt wird.5. The method according to any one of the preceding claims, characterized in that each of the spacer layers is printed thicker than the conductor tracks. 6. Folientastschalter, bei dem ein Isolationsabstand zwischen Leitern eines Trägers und Leitern einer flexiblen Deckfolie besteht und sich in Schaltkammern die Leiter frei gegenüberstehen, dadurch gekennzeichnet, daß zwei gleich dicke mit Leiterbahnen (2, 4) und gleich dicken Abstandsschichten (13, 14, 16, 17) bedruckte Folien an ihren Abstandsschichten (13, 14) miteinander verklebt sind.6. membrane switch, in which there is an insulation distance between conductors of a carrier and conductors of a flexible cover film and the conductors face each other freely in switching chambers, characterized in that two equally thick with conductor tracks (2, 4) and equally thick spacer layers (13, 14, 16, 17) printed films are glued together at their spacer layers (13, 14). 7. Folientastschalter nach Anspruch 6, dadurch gekennzeichnet, daß die Abstandsschichten (13, 14, 16, 17) bis auf die Schaltkammern (15) durchgehend verlaufen.7. membrane switch according to claim 6, characterized in that the spacer layers (13, 14, 16, 17) extend continuously to the switching chambers (15).
EP86109715A 1985-08-01 1986-07-16 Manufacturing process for a membrane key switch, and membrane key switch Withdrawn EP0212252A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853527561 DE3527561A1 (en) 1985-08-01 1985-08-01 MANUFACTURING METHOD FOR A FILM KEY SWITCH AND FILM KEY SWITCH
DE3527561 1985-08-01

Publications (2)

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EP0212252A2 true EP0212252A2 (en) 1987-03-04
EP0212252A3 EP0212252A3 (en) 1989-08-30

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EP86109715A Withdrawn EP0212252A3 (en) 1985-08-01 1986-07-16 Manufacturing process for a membrane key switch, and membrane key switch

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EP (1) EP0212252A3 (en)
JP (1) JPS6235418A (en)
DE (1) DE3527561A1 (en)

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EP0212252A3 (en) 1989-08-30
DE3527561A1 (en) 1987-02-05

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