EP0119603A2 - Push button switch installation - Google Patents

Push button switch installation Download PDF

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Publication number
EP0119603A2
EP0119603A2 EP84102871A EP84102871A EP0119603A2 EP 0119603 A2 EP0119603 A2 EP 0119603A2 EP 84102871 A EP84102871 A EP 84102871A EP 84102871 A EP84102871 A EP 84102871A EP 0119603 A2 EP0119603 A2 EP 0119603A2
Authority
EP
European Patent Office
Prior art keywords
contact
contact points
push button
intermediate layer
mat
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Withdrawn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
EP84102871A
Other languages
German (de)
French (fr)
Other versions
EP0119603A3 (en
Inventor
Jürgen Reuschel
Reinhold Dipl.-Ing. Heiss
Rudolf Dr. Ing. Wächtler
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP0119603A2 publication Critical patent/EP0119603A2/en
Publication of EP0119603A3 publication Critical patent/EP0119603A3/en
Withdrawn legal-status Critical Current

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    • 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
    • H01H13/78—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 characterised by the contacts or the contact sites
    • H01H13/807—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 characterised by the contacts or the contact sites characterised by the spatial arrangement of the contact sites, e.g. superimposed sites
    • 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
    • H01H2225/00—Switch site location
    • H01H2225/002—Switch site location superimposed
    • 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 key switch device with a plurality of key switches grouped into a keypad, which acts with their actuating elements on a bellows having elastic properties, mat, each lifting bellows carrying an electrically conductive contact piece in its interior, the contact points arranged on an insulating plate snap when the key is depressed bridged ..
  • Such a device is known for example from DE-GM 81 05 649.
  • the buttons are reset by bellows on a rubber mat.
  • the lifting bellows are each provided with a contact piece in their interior, so that contact points provided on a circuit board are bridged when the button is depressed.
  • buttons act on two contact foils arranged one above the other, separated by an insulating foil and provided with conductor tracks and contact points. In the area of the contact points, the insulating film each has a recess.
  • an attachment formed on the underside of the button acts on the upper contact sequence and thus brings about contact with the contact point underneath.
  • a similar device is also by DE-AS 26 60 067 known, in which the two contact foils are folded for assembly such that the associated contact points are arranged one above the other in the assembled state with the insertion of an intermediate layer.
  • the object of the invention is to present a push-button switching device in which it is possible to increase the number of circuits in a simple manner without too great changes to the device known from DE-GM 81 05 649.
  • the insulating plate is designed as an elastic contact film and is provided on both sides with conductor tracks and contact points, that a further contact film is arranged below this contact film, the one side with Conductor tracks and contact points are provided that the contact foils are kept at a distance from one another by an electrically non-conductive intermediate layer and that the intermediate layer has a recess in the area of the contact points.
  • the concept on which the invention is based therefore achieves the object by a combination of an insulating plate designed as a switching film and a conventional contact mat with lifting bellows.
  • the contact tracks of the first circuit are on the top of the switching foil e.g. applied by screen printing.
  • the switching foil itself takes over the task of the second circuit.
  • a pressure plate is arranged below the lower contact film, which limits the stroke of the keys.
  • the lower and upper contact foils are formed in one piece and are folded laterally or at their end facing away from the electrical connection and / or are glued to one another.
  • the figure shows a key switch device in cross section.
  • the key switch device consisting of a plurality of keys is arranged in a housing 3. It consists of key buttons 1, 2, of which the button 1 is shown in the non-pressed state, the button 2 in the depressed state.
  • the buttons are on bellows 4, 5 a contact mat 6.
  • the lifting bellows are provided on their side facing the contact mat 6 with electrically conductive contact pins 7, 8.
  • Two insulating plates designed as contact foils 9, 10 are arranged below the contact mat.
  • the contact film 9 is provided on both sides with conductor tracks and with contact points 11, 12, 13, 14, the contact film 10 only on one side with the contact points 15, 16. Between the contact films there is an intermediate film 17 made of insulating material, which has recesses 18 in the area of the contact points , 19 has.
  • the contact foils 9, 10 are arranged between the contact mat 6 and a pressure plate 20.

Abstract

The invention relates to a push button switch installation having a plurality of push button switches grouped into a keyboard, the operating elements (1, 2) of which act on a mat (6) with elastic properties, having a lifting bellows. Each lifting bellows has a contact piece (7, 8) on its inside which bridges contact points (11, 12), in a snapping fashion, when the push button switch is depressed, the contact points being arranged on an insulating plate. The object of the invention is to increase the number of circuits. This is achieved by arranging two contact foils (9, 10), having conductor paths and contact points, beneath the contact mat (6), by separating the two contact foils from one another by an intermediate layer (17) of dielectric, by providing the intermediate layer with cut-outs in the region of the contact points, and by providing the upper contact foil (9) with conductor paths and contact points on both sides, while the contact foil (10) located underneath is provided with contact points (15, 16) on only one side. Applicable to keyboards for telecommunications technology. <IMAGE>

Description

Die Erfindung betrifft eine Tastschaltvorrichtung mit mehreren zu einem Tastenfeld gruppierten Tastschaltern, die mit ihren Betätigungselementen auf eine Hubbälge aufweisende, elastische Eigenschaften aufweisende Matte einwirkt, wobei jeder Hubbalg in seinem Inneren ein elektrisch leitfähiges Kontaktstück trägt, das bei niedergedrückter Taste auf einer Isolierplatte angeordnete Kontaktstellen schnappartig überbrückt..The invention relates to a key switch device with a plurality of key switches grouped into a keypad, which acts with their actuating elements on a bellows having elastic properties, mat, each lifting bellows carrying an electrically conductive contact piece in its interior, the contact points arranged on an insulating plate snap when the key is depressed bridged ..

Eine derartige Vorrichtung ist beispielsweise durch das DE-GM 81 05 649 bekannt. Hierbei wird die Rückstellung der Tasten durch Hubbälge einer Gummimatte bewirkt. Die Hubbälge sind in ihrem Inneren mit jeweils einem Kontaktstück versehen, so daß bei niedergedrückter Taste auf einer Leiterplatte vorgesehene Kontaktstellen uberbruckt werden.Such a device is known for example from DE-GM 81 05 649. The buttons are reset by bellows on a rubber mat. The lifting bellows are each provided with a contact piece in their interior, so that contact points provided on a circuit board are bridged when the button is depressed.

Eine weitere Vorrichtung ist durch die Zeitschrift IBM Technical Disclosure Bulletin, Bd. 13, Nr. 7, Dez. 1970, S. 1962-1963 bekannt. Hierbei wirken die Tasten auf zwei ubereinander angeordnete, aurch eine Isolierfolie getrennte mit Leiterbahnen und Kontaktstellen versehene Kontaktfolien ein. Im Bereich der Kontaktstellen weist die Isolierfolie jeweils eine Ausnehmung auf. bei niedergedrückter Taste wirkt ein an der Unterseite der Taste angeformter Ansatz auf die obere Kontaktfolge ein und bewirkt damit eine Kontaktgabe mit der darunterliegenden Kontaktstelle.Another device is known from the journal IBM Technical Disclosure Bulletin, Vol. 13, No. 7, Dec. 1970, pp. 1962-1963. Here, the buttons act on two contact foils arranged one above the other, separated by an insulating foil and provided with conductor tracks and contact points. In the area of the contact points, the insulating film each has a recess. when the button is depressed, an attachment formed on the underside of the button acts on the upper contact sequence and thus brings about contact with the contact point underneath.

Eine ähnliche Vorrichtung ist weiterhin durch die DE-AS 26 60 067 bekannt, bei der die beiden Kontaktfolien zur Montage derart gefaltet sind, daß die zugehörigen Kontaktstellen im montierten Zustand unter Einfügung einer Zwischenlage übereinander angeordnet sind.A similar device is also by DE-AS 26 60 067 known, in which the two contact foils are folded for assembly such that the associated contact points are arranged one above the other in the assembled state with the insertion of an intermediate layer.

Allen diesen bekannten Vorrichtungen haftet der Nachteil an,_ daß jeweils einer Taste nur ein Strom- bzw. Schaltkreis zugeordnet ist. Es kann aufgrund elektrotechnischer Belange jedoch ein zweiter, vom ersten Schaltkreis galvanisch getrennter Schaltkreis pro Taste erforderlich sein. Dies kann beispielsweise dann sein, wenn bei Stromversorgung durch das öffentliche Netz ein Notbetrieb bei Ausfall der öffentlichen Versorgung aufrechtzuerhalten ist.All these known devices have the disadvantage that only one current or circuit is assigned to a key. However, a second circuit, electrically isolated from the first circuit, per key may be required due to electrical engineering concerns. This can be the case, for example, if emergency operation in the event of a failure of the public supply is to be maintained when the power is supplied by the public network.

Zur Erhöhung der Schaltkreise hat man bisher Optokoppler sowie mechanische Umschalter verwendet. Weiterhin sind Versuche unternommen worden, die Anzahl der elastischen Isolierplatten zu erhöhen. Ein wesentlicher Nachteil ist dabei jedoch eine sich dabei einstellende ungünstige Tastcharakteristik. Der Tastenbenutzer muß erst bei gedrückter Taste eine verhältnismäßig große Kraft aufwenden, um die Isolierplatten miteinander im Bereich der Kontaktstelle zu verbinden. Daraus folgt, daß der Erhöhung der Anzahl der Isolierplatten sehr schnell Grenzen gesetzt sind.So far, optocouplers and mechanical switches have been used to increase the circuits. Attempts have also been made to increase the number of elastic insulating plates. A major disadvantage, however, is an unfavorable tactile characteristic that arises. The key user must only apply a relatively large force when the key is pressed in order to connect the insulating plates to one another in the region of the contact point. It follows that there are very quickly limits to the increase in the number of insulating plates.

Aufgabe der Erfindung ist es, eine Tastschaltvorrichtung vorzustellen, bei der es ohne allzu große Änderungen an der durch das DE-GM 81 05 649 bekannten Vorrichtung möglich ist, auf einfache Weise die Anzahl der Schaltkreise zu erhöhen.The object of the invention is to present a push-button switching device in which it is possible to increase the number of circuits in a simple manner without too great changes to the device known from DE-GM 81 05 649.

Die Aufgabe wird gemäß der Erfindung dadurch gelöst, daß die Isolierplatte als elastische Kontaktfolie ausgebildet ist und beidseitig mit Leiterbahnen und Kontaktstellen versehen ist, daß unterhalb dieser Kontaktfolie eine weitere Kontaktfolie angeordnet ist, die einseitig mit Leiterbahnen und Kontaktstellen versehen ist, daß die Kontaktfolien durch eine elektrisch nichtleitende Zwischenlage in Abstand voneinander gehalten sind und daß die Zwischenlage im Bereich der Kontaktstellen jeweils eine Ausnehmung aufweist.The object is achieved according to the invention in that the insulating plate is designed as an elastic contact film and is provided on both sides with conductor tracks and contact points, that a further contact film is arranged below this contact film, the one side with Conductor tracks and contact points are provided that the contact foils are kept at a distance from one another by an electrically non-conductive intermediate layer and that the intermediate layer has a recess in the area of the contact points.

Das der Erfindung zugrundeliegende Konzept löst die Aufgabe demnach durch eine Kombination aus einer als Schaltfolie ausgebildeten Isolierpl-atte und einer herkömmlichen Kontaktmatte mit Hubbälgen. Die Kontaktleiterbahnen des ersten Stromkreises sind auf der Oberseite der Schaltfolie z.B. durch Siebdruck aufgebracht. Die Schaltfolie selbst übernimmt die Aufgabe des zweiten Stromkreises. Der Vorteil gegenüber einer Anordnung mit mehr als zwei Schaltfolien besteht in einer besseren Tastcharakteristik und einer wesentlich geringeren Tastkraft.The concept on which the invention is based therefore achieves the object by a combination of an insulating plate designed as a switching film and a conventional contact mat with lifting bellows. The contact tracks of the first circuit are on the top of the switching foil e.g. applied by screen printing. The switching foil itself takes over the task of the second circuit. The advantage over an arrangement with more than two switching foils is a better touch characteristic and a significantly lower touch force.

Vorteilhaft ist es, daß unterhalb der unteren Kontaktfolie eine Druckplatte angeordnet ist, die den Hub der Tasten begrenzt.It is advantageous that a pressure plate is arranged below the lower contact film, which limits the stroke of the keys.

Aus Fertigungs- und Montagegründen-kann es weiterhin zweckmäßig sein, daß die untere und obere Kontaktfolie einstückig ausgebildet sind und seitlich oder an ihrem dem elektrischen Anschluß abgewandten Ende gefaltet und/ oder miteinander verklebt sind.For manufacturing and assembly reasons, it may also be expedient that the lower and upper contact foils are formed in one piece and are folded laterally or at their end facing away from the electrical connection and / or are glued to one another.

Im folgenden sei die Erfindung anhand einer Abbildung näher erläutert.The invention is explained in more detail below with the aid of an illustration.

Die Abbildung zeigt eine Tastschaltvorrichtung im Querschnitt. Die aus einer Vielzahl von Tasten bestehende Tastschaltvorrichtung ist in einem Gehäuse 3 angeordnet. Sie besteht aus Tastenknöpfen 1, 2, von denen der Knopf 1 im nichtgedrückten, der Knopf 2 im niedergedrückten Zustand dargestellt ist. Die Knöpfe liegen an Hubbälgen 4, 5 einer Kontaktmatte 6 an. Die Hubbälge sind auf ihrer der Kontaktmatte 6 zugewandten Seite mit elektrisch leitfähigen Kontaktpimpeln 7, 8 versehen. Unterhalb der Kontaktmatte sind zwei als Kontaktfolien 9, 10 ausgebildete Isolierplatten angeordnet. Die Kontaktfolie 9 ist beidseitig mit Leiterbahnen sowie mit Kontaktstellen 11, 12, 13, 14 versehen, die Kontaktfolie 10 nur einseitig mit den Kontaktstellen 15, 16. Zwischen den Kontaktfolien ist eine aus Isolierstoff gebildete Zwischenfolie 17 angeordnet, die im Bereich der Kontaktstellen Ausnehmungen 18, 19 aufweist. Die Kontaktfolien 9, 10 sind zwischen der Kontaktmatte 6 und einer Druckplatte 20 angeordnet.The figure shows a key switch device in cross section. The key switch device consisting of a plurality of keys is arranged in a housing 3. It consists of key buttons 1, 2, of which the button 1 is shown in the non-pressed state, the button 2 in the depressed state. The buttons are on bellows 4, 5 a contact mat 6. The lifting bellows are provided on their side facing the contact mat 6 with electrically conductive contact pins 7, 8. Two insulating plates designed as contact foils 9, 10 are arranged below the contact mat. The contact film 9 is provided on both sides with conductor tracks and with contact points 11, 12, 13, 14, the contact film 10 only on one side with the contact points 15, 16. Between the contact films there is an intermediate film 17 made of insulating material, which has recesses 18 in the area of the contact points , 19 has. The contact foils 9, 10 are arranged between the contact mat 6 and a pressure plate 20.

Claims (3)

1. Tastschaltvorrichtung mit mehreren zu einem Tastenfeld gruppierten Tastschaltern, die mit ihren Betätigungselementen auf eine Hubbälge aufweisende, elastische Eigenschaften aufweisende Matte einwirkt, wobei jeder Hubbalg in seinem Inneren ein elektrisch leitfähiges Kontaktstück trägt, das bei niedergedrückter Taste auf einer Isolierplatte angeordnete Kontaktstellen schnappartig überbrückt, dadurch gekennzeichnet, daß die Isolierplatte als elastische Kontaktfolie (9) ausgebildet ist und beidseitig mit Leiterbahnen und Kontaktstellen (11, 12, 13, 14) versehen ist, daß unterhalb dieser Kontaktfolie (9) eine weitere Kontaktfolie (10) angeordnet ist, die einseitig mit Leiterbahnen und Kontaktstellen (15, 16) versehen ist, daß die Kontaktfolien (9, 10) durch eine elektrisch nichtleitende Zwischenlage (17) in Abstand voneinander gehalten sind und daß die Zwischenlage im Bereich der Kontaktstellen jeweils eine Ausnehmung (18, 19) aufweist.1. Pushbutton switch device with a plurality of pushbutton switches grouped into a keypad, which acts with their actuating elements on a mat having elastic bellows and having elastic properties, each bellows carrying an electrically conductive contact piece in its interior which, when the button is depressed, bridges contact points arranged on an insulating plate in a snap, characterized in that the insulating plate is designed as an elastic contact film (9) and is provided on both sides with conductor tracks and contact points (11, 12, 13, 14), in that a further contact film (10) is arranged below this contact film (9), which is on one side is provided with conductor tracks and contact points (15, 16) that the contact foils (9, 10) are kept at a distance from one another by an electrically non-conductive intermediate layer (17) and that the intermediate layer has a recess (18, 19) in the area of the contact points . 2. Tastschaltvorrichtung nach Anspruch 1, dadurch gekennzeichnet , daß unterhalb der unteren Kontaktfolie (10) eine Druckplatte (20) angeordnet ist, die den Hub der Tasten (1, 2) begrenzt.2. Key switch device according to claim 1, characterized in that a pressure plate (20) is arranged below the lower contact film (10), which limits the stroke of the keys (1, 2). 3. Tastschaltvorrichtung nach Anspruch 1, dadurch gekennzeichnet , daß die untere und obere Kontaktfdlie (9, 10) einstückig ausgebildet sind und seitlich oder an ihrem dem elektrischen Anschluß abgewandten Ende gefaltet und/oder miteinander verklebt sind.3. Key switch device according to claim 1, characterized in that the lower and upper Kontaktfdlie (9, 10) are integrally formed and folded laterally or at their end remote from the electrical connection and / or glued together.
EP84102871A 1983-03-18 1984-03-15 Push button switch installation Withdrawn EP0119603A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3309816 1983-03-18
DE19833309816 DE3309816A1 (en) 1983-03-18 1983-03-18 KEY SWITCH DEVICE

Publications (2)

Publication Number Publication Date
EP0119603A2 true EP0119603A2 (en) 1984-09-26
EP0119603A3 EP0119603A3 (en) 1986-10-08

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP84102871A Withdrawn EP0119603A3 (en) 1983-03-18 1984-03-15 Push button switch installation

Country Status (4)

Country Link
EP (1) EP0119603A3 (en)
AU (1) AU545022B2 (en)
DE (1) DE3309816A1 (en)
NO (1) NO840708L (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3504424A1 (en) * 1985-02-07 1986-08-07 Deutsche Telephonwerk Kabel Switching-foil keyboard
DE3703546A1 (en) * 1987-02-06 1988-08-18 Telefunken Electronic Gmbh Switch having an enclosed switching mat

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3917917A (en) * 1973-08-23 1975-11-04 Alps Electric Co Ltd Keyboard pushbutton switch assembly having multilayer contact and circuit structure
DE8105649U1 (en) * 1981-02-27 1981-08-13 Siemens AG, 1000 Berlin und 8000 München Keypad for telephones
US4307268A (en) * 1978-11-17 1981-12-22 Rogers Corporation Tactile element and keyboard including the tactile element
EP0051749A1 (en) * 1980-11-06 1982-05-19 PREH, Elektrofeinmechanische Werke Jakob Preh Nachf. GmbH &amp; Co. Keyboard

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3917917A (en) * 1973-08-23 1975-11-04 Alps Electric Co Ltd Keyboard pushbutton switch assembly having multilayer contact and circuit structure
US4307268A (en) * 1978-11-17 1981-12-22 Rogers Corporation Tactile element and keyboard including the tactile element
EP0051749A1 (en) * 1980-11-06 1982-05-19 PREH, Elektrofeinmechanische Werke Jakob Preh Nachf. GmbH &amp; Co. Keyboard
DE8105649U1 (en) * 1981-02-27 1981-08-13 Siemens AG, 1000 Berlin und 8000 München Keypad for telephones

Also Published As

Publication number Publication date
AU545022B2 (en) 1985-06-27
NO840708L (en) 1984-09-19
DE3309816A1 (en) 1984-09-20
AU2568084A (en) 1984-09-20
EP0119603A3 (en) 1986-10-08

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