EP0073932B1 - Key switch - Google Patents

Key switch Download PDF

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Publication number
EP0073932B1
EP0073932B1 EP82107034A EP82107034A EP0073932B1 EP 0073932 B1 EP0073932 B1 EP 0073932B1 EP 82107034 A EP82107034 A EP 82107034A EP 82107034 A EP82107034 A EP 82107034A EP 0073932 B1 EP0073932 B1 EP 0073932B1
Authority
EP
European Patent Office
Prior art keywords
contact
tongue
push
button switch
sheet
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.)
Expired
Application number
EP82107034A
Other languages
German (de)
French (fr)
Other versions
EP0073932A1 (en
Inventor
Heinz Burgeth
Günter Ing. grad. Tessendorf
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.)
Telefunken Electronic GmbH
Original Assignee
Telefunken Electronic GmbH
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 Telefunken Electronic GmbH filed Critical Telefunken Electronic GmbH
Priority to AT82107034T priority Critical patent/ATE16870T1/en
Publication of EP0073932A1 publication Critical patent/EP0073932A1/en
Application granted granted Critical
Publication of EP0073932B1 publication Critical patent/EP0073932B1/en
Expired 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
    • H01H13/7013—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 in which the movable contacts of each switch site or of a row of switch sites are formed in a single plate

Definitions

  • the invention relates to a push button switch according to the preamble of claim 1.
  • a contact carrier with contacts is provided, on which a spacer film with recesses adapted to the contacts rests.
  • a film of elastic, electrically insulating material runs parallel to the spacer film and is provided with a counter contact in the region of each contact.
  • the film is provided on one side with an elastic metal covering and has punched-out tabs which, as movable counter-contacts, face the contacts on the contact carrier and are permanently bent at an acute angle at their base in relation to the plane of the film.
  • the metal covering is on the side of the film after which the tabs are bent. The tabs thus incline towards the contact carrier.
  • the interposed spacer foil In order to ensure a sufficient distance between the contacts and the counter-contacts formed by the metal layer, the interposed spacer foil must be as thick as is dictated by the required contact spacing and the height by which the tabs protrude from the plane of the foil. As a result, the overall height of the pushbutton switch is increased accordingly and to actuate the tabs which are recessed in the film, correspondingly long switching plungers are required, for which a corresponding mechanical guidance is also necessary.
  • the electrical metal covering also serves to generate a sufficient restoring force of the tabs.
  • a pushbutton switch is also known (IBM Technical Disclosure Bulletin, Vol. 16 No. 3August 1973, page 954), which has cup-like actuating elements in a cover film.
  • a projection is provided centrally within the cup-shaped actuating element, which sits on a snap element and thereby bridges the free space between the actuating surface of the actuating element and the snap element.
  • the snap element is designed as a bracket or dome and rests on contact pieces in the outer region. In the central, bulging area there is a counter-contact piece in the plane of the first-mentioned contact pieces, against which the snap element snaps when the actuating element is pressed.
  • individual snap elements and contact pieces must be provided, for which appropriate mechanical brackets and centering are required to ensure their mutual assignment.
  • the invention has for its object to take measures in a key switch according to the preamble of claim 1, which results in a small footprint.
  • the inner free space enclosed by the dome is used for accommodating the tab bent upwards.
  • a spacer film arranged between the film and the contact carrier can then be made so thin that only an electrical separation between conductor tracks on the contact carrier and the film is achieved or this spacer film can also be omitted if there is no mutual contact between the contact paths of the contact carrier and the film can occur because the required distance between the associated contact on the contact carrier and the mating contact on the film is established by the tab inclined away from the contact carrier.
  • the free switching stroke of the dome which is predetermined by the height of the space enclosed by the dome, can thus be used for depressing the tab towards the counter contact.
  • the dome forms a self-contained actuating element that does not require special guidance.
  • Contacts 2 arranged in pairs are located on a contact carrier 1 and can be connected to external connections via connecting lines (not shown).
  • a film 3 made of elastic material, from which 2 tabs 4 are punched out in the area of the contacts.
  • mating contacts 5 In the area of the free ends of the tabs 4 there are mating contacts 5, with which the respectively assigned contact pairs 2 can be bridged by pressing down the tabs 4.
  • On the film 3, which consists of electrically insulating plastic there is a cover film 6, in which dome-shaped actuating elements 7 are molded.
  • the actuating elements 7 are each assigned to a tab 4 and have a web 8 which extends from the edge of a round opening 9 encompassing the tab 4 in the cover sheet 6 covering the sheet 3 and is pulled up over the level of the cover sheet 6 and the tab 4 spreads.
  • the web 8 is pivotally attached above the foot 10 of the tab 4 connected to the film 3, the part of the web 8 overlapping the tab 4 being actuated surface 11 serves.
  • the web 8 is connected via a conical support skin 12 to the rest of the opening 9.
  • the support skin 12 brings about a dustproof and watertight closure in the region of the actuating element 7 and, particularly when the actuating element 7 is pressed down, causes a snap effect, as a result of which the contacts 2, 5 are switched to torque.
  • the film 3 made of insulating material lies directly on the contact carrier 1.
  • the tabs 4 are bent at their base 10 relative to the plane of the film 3 by permanent deformation at an acute angle so that the mating contacts 5 are lifted in an oblique position relative to the contacts 2 are.
  • a spacer film between the film 3 and the contact carrier 1 can be omitted, so that their manufacturing and assembly costs can be saved.
  • small bumps can also be provided on the contact carrier 1 in the area of the foot of each tab, which lifts the tab from the contacts 2 in the unactuated state.
  • the tab 4 engages in the dome of the actuating element 7, so that the path required for the switching stroke can also be used as a distance for the switching distance between the contacts 2 and the counter-contact 5. This means that no additional space is required.
  • a spacer film can be used between the film 3 and the contact carrier 1, which has cutouts in the area of the contacts 2, 5. As a result, a necessary distance between the contacts 2 and the counter contacts 5 can be ensured.
  • the tab 4 By depressing the actuating surface 11, which has an actuating nose 15 on its inside, the tab 4 is pressed against the assigned contacts 2 in the manner of a snap switch by the snap action of the dome-shaped actuating element 7 via the actuating nose 15. Due to the inherent elasticity of the film 3, the tab 4 then swings back into its initial position after the actuating element 7 is released.

Landscapes

  • Push-Button Switches (AREA)

Abstract

1. A push-button switch having a contact carrier (1), parallel to which there is disposed a sheet (3) of resilient, electrically insulating material which comprises a resilient tongue (4) which is punched free and which is permanently bent at an acute angle at its foot (10) in relation to the plane of the sheet (3) and carries an opposite contact (5) which is lifted from a contact (2) on the contact carrier (1), and having an adjustable actuating element (7) which is disposed above the contact (2, 5), characterised in that the actuating element (7) is of dome-shaped construction and that the resilient tongue (4) is lifted from the contact carrier (1) in the region of the opposite contact (5) and is bent into the dome.

Description

Die Erfindung betrifft einen Tastschalter gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a push button switch according to the preamble of claim 1.

Bei einem bekannten Tastschalter dieser Art (FR-A-2 400 820) ist ein Kontaktträger mit Kontakten vorgesehen, auf dem eine Abstandsfolie mit den Kontakten angepaßten Aussparungen aufliegt. Über der Abstandsfolie verläuft parallel eine Folie aus elastischem, elektrisch isolierendem Material, die im Bereich jedes Kontaktes mit einem Gegenkontakt versehen ist. Die Folie ist einseitig mit einem elastischen Metallbelag versehen und weist freigestanzte Laschen auf, die als bewegliche Gegenkontakte den Kontakten auf dem Kontaktträger gegenüberstehen und an ihrem Fuß gegenüber der Ebene der Folie bleibend in einem spitzen Winkel abgeknickt sind. Der Metallbelag befindet sich dabei auf der Seite der Folie, nach der die Laschen ausgeknickt sind. Die Laschen neigen sich somit zum Kontaktträger hin. Um einen ausreichenden Abstand zwischen den Kontakten und den durch die Metallschicht gebildeten Gegenkontakten sicherzustellen, muß die zwischengefügte Abstandsfolie so dick sein, wie es durch den erforderlichen Kontaktabstand und die Höhe vorgegeben ist, um die die Laschen aus der Ebene der Folie herausstehen. Hierdurch wird die Bauhöhe des Tastschalters entsprechend erhöht und zur Betätigung der vertieft in der Folie angeordneten Laschen sind entsprechend lang ausgebildete Schaltstößel erforderlich, für die auch eine entsprechende mechanische Führung notwendig ist. Der elektrische Metallbelag dient im übrigen zur Erzeugung einer ausreichenden Rückstellkraft der Laschen.In a known push button switch of this type (FR-A-2 400 820), a contact carrier with contacts is provided, on which a spacer film with recesses adapted to the contacts rests. A film of elastic, electrically insulating material runs parallel to the spacer film and is provided with a counter contact in the region of each contact. The film is provided on one side with an elastic metal covering and has punched-out tabs which, as movable counter-contacts, face the contacts on the contact carrier and are permanently bent at an acute angle at their base in relation to the plane of the film. The metal covering is on the side of the film after which the tabs are bent. The tabs thus incline towards the contact carrier. In order to ensure a sufficient distance between the contacts and the counter-contacts formed by the metal layer, the interposed spacer foil must be as thick as is dictated by the required contact spacing and the height by which the tabs protrude from the plane of the foil. As a result, the overall height of the pushbutton switch is increased accordingly and to actuate the tabs which are recessed in the film, correspondingly long switching plungers are required, for which a corresponding mechanical guidance is also necessary. The electrical metal covering also serves to generate a sufficient restoring force of the tabs.

Es ist auch ein Tastschalter bekannt (IBM Technical Disclosure Bulletin, Vol. 16 No. 3August 1973, Seite 954), der in einer Abdeckfolie tassenförmige (cup-like) Betätigungselemente aufweist. Innerhalb des tassenförmigen Betätigungselementes ist zentral ein Vorsprung vorgesehen, der auf einem Schnappelement aufsitzt und dadurch den freien Raum zwischen der Betätigungsfläche des Betätigungselementes und dem Schnappelement überbrückt. Das Schnappelement ist als Bügel oder Kalotte ausgebildet und liegt im Außenbereich auf Kontaktstücken auf. Im mittleren, aufgewölbten Bereich befindet sich in der Ebene der erstgenannten Kontaktstücke ein Gegenkontaktstück, gegen welches das Schnappelement bei einem Druck auf das Betätigungselement schnappt. Für den Aufbau eines Schalters dieser Art müssen einzelne Schnappelemente und Kontaktstücke vorgesehen werden, für die entsprechende mechanische Halterungen und Zentrierungen erforderlich sind, um ihre gegenseitige Zuordnung zu sichern.A pushbutton switch is also known (IBM Technical Disclosure Bulletin, Vol. 16 No. 3August 1973, page 954), which has cup-like actuating elements in a cover film. A projection is provided centrally within the cup-shaped actuating element, which sits on a snap element and thereby bridges the free space between the actuating surface of the actuating element and the snap element. The snap element is designed as a bracket or dome and rests on contact pieces in the outer region. In the central, bulging area there is a counter-contact piece in the plane of the first-mentioned contact pieces, against which the snap element snaps when the actuating element is pressed. For the construction of a switch of this type, individual snap elements and contact pieces must be provided, for which appropriate mechanical brackets and centering are required to ensure their mutual assignment.

Der Erfindung liegt die Aufgabe zugrunde, bei einem Tastschalter gemäß dem Oberbegriff des Anspruchs 1 Maßnahmen zu treffen, durch die sich ein geringer Platzbedarf ergibt.The invention has for its object to take measures in a key switch according to the preamble of claim 1, which results in a small footprint.

Lösung dieser Aufgabe erfolgt gemäß der Erfindung durch die kennzeichnenden Merkmale des Anspruchs 1.This object is achieved according to the invention by the characterizing features of claim 1.

Bei einer Ausgestaltung eines Tastschalters gemäß der Erfindung wird der vom Dom umschlossene, innere freie Raum für die Unterbringung der nach oben abgeknickten Lasche ausgenutzt. Eine zwischen der Folie und dem Kontaktträger angeordnete Abstandsfolie kann dann so dünn ausgebildet werden, daß lediglich eine elektrische Trennung zwischen Leiterzügen auf dem Kontaktträger und der Folie erreicht wird bzw. kann diese Abstandsfolie auch entfallen, wenn keine gegenseitigen Berührungen von Kontaktbahnen des Kontaktträgers und der Folie eintreten können, weil der erforderliche Abstand zwischen dem zugehörigen Kontakt auf dem Kontaktträger und dem Gegenkontakt auf der Folie durch die vom Kontaktträger weggeneigte Lasche hergestellt wird. Der freie, durch die Höhe des vom Dom umschlossenen Raumes vorgegebene Schalthub des Domes kann so für das Niederdrücken der Lasche zum Gegenkontakt hin ausgenutzt werden. Dabei bildet der Dom ein in sich gefügtes Betätigungselement, das einer besonderen Führung nicht bedarf.In one embodiment of a push button switch according to the invention, the inner free space enclosed by the dome is used for accommodating the tab bent upwards. A spacer film arranged between the film and the contact carrier can then be made so thin that only an electrical separation between conductor tracks on the contact carrier and the film is achieved or this spacer film can also be omitted if there is no mutual contact between the contact paths of the contact carrier and the film can occur because the required distance between the associated contact on the contact carrier and the mating contact on the film is established by the tab inclined away from the contact carrier. The free switching stroke of the dome, which is predetermined by the height of the space enclosed by the dome, can thus be used for depressing the tab towards the counter contact. The dome forms a self-contained actuating element that does not require special guidance.

Weitere, vorteilhafte Ausgestaltungen der Erfindung sind in den weiteren Ansprüchen angegeben.Further advantageous refinements of the invention are specified in the further claims.

Die Erfindung ist nachfolgend anhand der Zeichnungen von Ausführungsbeispielen erläutert.The invention is explained below with reference to drawings of exemplary embodiments.

Es zeigt

  • Fig. 1 einen Querschnitt durch eine Tastenschalteranordnung mit angehobener Lasche und
  • Fig. 2 eine Draufsicht auf die mit den Laschen versehene Folie.
It shows
  • Fig. 1 shows a cross section through a key switch arrangement with raised tab and
  • Fig. 2 is a plan view of the film provided with the tabs.

Auf einem Kontaktträger 1 befinden sich paarweise angeordnete Kontakte 2, die über nicht dargestellte Verbindungsleitungen mit äußeren Anschlüssen verbindbar sind. Oberhalb des Kontaktträgers 1 befindet sich eine Folie 3 aus elastischem Material, aus welcher im Bereich der Kontakte 2 Laschen 4 freigestanzt sind. Im Bereich der freien Enden der Laschen 4 befinden sich Gegenkontakte 5, mit welchen durch Niederdrücken der Laschen 4 die jeweils zugeordneten Kontaktpaare 2 überbrückbar sind. Es ist jedoch auch möglich, die Gegenkontakte 5 über Leitungsbahnen auf der Folie 3 mit äußeren Anschlüssen zu verbinden. Auf der Folie 3, die aus elektrisch isolierendem Kunststoff besteht, liegt eine Abdeckfolie 6 auf, in die domförmige Betätigungselemente 7 eingeformt sind. Die Betätigungselemente 7 sind je einer Lasche 4 zugeordnet und weisen einen Steg 8 auf, der vom Rand eines runden, die Lasche 4 umgreifenden Durchbruchs 9 in der die Folie 3 überdeckenden Abdeckfolie 6 ausgeht und über die Ebene der Abdeckfolie 6 hochgezogen ist sowie die Lasche 4 übergreift. Der Steg 8 ist oberhalb des mit der Folie 3 verbundenen Fußes 10 der Lasche 4 schwenkbar angesetzt, wobei der die Lasche 4 übergreifende Teil des Steges 8 als Betätigungsfläche 11 dient. Der Steg 8 ist über eine kegelförmige Stützhaut 12 mit dem übrigen Rand des Durchbruchs 9 verbunden. Die Stützhaut 12 bewirkt einen staub- und wasserdichten Abschluß im Bereich des Betätigungselementes 7 und bewirkt insbesondere beim Niederdrücken des Betätigungselementes 7 einen Schnappeffekt, wodurch eine Momentschaltung der Kontakte 2, 5 erzielt wird.Contacts 2 arranged in pairs are located on a contact carrier 1 and can be connected to external connections via connecting lines (not shown). Above the contact carrier 1 there is a film 3 made of elastic material, from which 2 tabs 4 are punched out in the area of the contacts. In the area of the free ends of the tabs 4 there are mating contacts 5, with which the respectively assigned contact pairs 2 can be bridged by pressing down the tabs 4. However, it is also possible to connect the mating contacts 5 to external connections via conductor tracks on the film 3. On the film 3, which consists of electrically insulating plastic, there is a cover film 6, in which dome-shaped actuating elements 7 are molded. The actuating elements 7 are each assigned to a tab 4 and have a web 8 which extends from the edge of a round opening 9 encompassing the tab 4 in the cover sheet 6 covering the sheet 3 and is pulled up over the level of the cover sheet 6 and the tab 4 spreads. The web 8 is pivotally attached above the foot 10 of the tab 4 connected to the film 3, the part of the web 8 overlapping the tab 4 being actuated surface 11 serves. The web 8 is connected via a conical support skin 12 to the rest of the opening 9. The support skin 12 brings about a dustproof and watertight closure in the region of the actuating element 7 and, particularly when the actuating element 7 is pressed down, causes a snap effect, as a result of which the contacts 2, 5 are switched to torque.

Bei einer Ausgestaltung des Tastschalters gemäß den Figuren liegt die aus isolierendem Material bestehende Folie 3 unmittelbar auf dem Kontaktträger 1 auf. Um hierbei eine Berührung der Kontakte 2 mit dem Gegenkontakt 5 zu verhindern, sind die Laschen 4 an ihrem Fuß 10 gegenüber der Ebene der Folie 3 durch bleibende Verformung in einem spitzen Winkel so abgeknickt, daß die Gegenkontakte 5 in schräger Lage gegenüber den Kontakten 2 abgehoben sind. Hierdurch kann eine Abstandsfolie zwischen der Folie 3 und dem Kontaktträger 1 entfallen, so daß deren Herstellungs- und Montagekosten eingespart werden können. Um die Schrägstellung der Laschen 4 zu gewährleisten, können auch auf dem Kontaktträger 1 im Bereich des Fußes jeder Lasche kleine Erhebungen vorgesehen werden, welche die Lasche in unbetätigtem Zustand von den Kontakten 2 abhebt. Die Lasche 4 greift in den Dom des Betätigungselementes 7 ein, so daß der für den Schalthub notwendige Weg zugleich als Abstand für die Schaltstrecke zwischen den Kontakten 2 und dem Gegenkontakt 5 ausgenutzt werden kann. Es ergibt sich hierdurch kein zusätzlicher Platzbedarf.In one configuration of the pushbutton switch according to the figures, the film 3 made of insulating material lies directly on the contact carrier 1. In order to prevent contact of the contacts 2 with the mating contact 5, the tabs 4 are bent at their base 10 relative to the plane of the film 3 by permanent deformation at an acute angle so that the mating contacts 5 are lifted in an oblique position relative to the contacts 2 are. As a result, a spacer film between the film 3 and the contact carrier 1 can be omitted, so that their manufacturing and assembly costs can be saved. In order to ensure the inclination of the tabs 4, small bumps can also be provided on the contact carrier 1 in the area of the foot of each tab, which lifts the tab from the contacts 2 in the unactuated state. The tab 4 engages in the dome of the actuating element 7, so that the path required for the switching stroke can also be used as a distance for the switching distance between the contacts 2 and the counter-contact 5. This means that no additional space is required.

Zwischen die Folie 3 und den Kontaktträger 1 kann eine Abstandsfolie eingesetzt werden, die im Bereich der Kontakte 2, 5 Aussparungen aufweist. Hierdurch kann ein notwendiger Abstand zwischen den Kontakten 2 und den Gegenkontakten 5 sichergestellt werden. Durch Niederdrücken der Betätigungsfläche 11, die an ihrer Innenseite eine Betätigungsnase 15 aufweist, wird durch die Schnappwirkung des domförmigen Betätigungselementes 7 über die Betätigungsnase 15 die Lasche 4 gegen die zugeordneten Kontakte 2 nach Art eines Schnappschalters gedrückt. Aufgrund der Eigenelastizität der Folie 3 schwenkt dann nach dem Loslassen des Betätigungselementes 7 die Lasche 4 in ihre Ausgangslage zurück.A spacer film can be used between the film 3 and the contact carrier 1, which has cutouts in the area of the contacts 2, 5. As a result, a necessary distance between the contacts 2 and the counter contacts 5 can be ensured. By depressing the actuating surface 11, which has an actuating nose 15 on its inside, the tab 4 is pressed against the assigned contacts 2 in the manner of a snap switch by the snap action of the dome-shaped actuating element 7 via the actuating nose 15. Due to the inherent elasticity of the film 3, the tab 4 then swings back into its initial position after the actuating element 7 is released.

Claims (6)

1. A push-button switch having a contact carrier (1), parallel to which there is disposed a sheet (3) of resilient, electrically insulating material which comprises a resilient tongue (4) which is punched free and which is permanently bent at an acute angle at its foot (10) in relation to the plane of the sheet (3) and carries an opposite contact (5) which is lifted from a contact (2) on the contact carrier (1), and having an adjustable actuating element (7) which is disposed above the contact (2, 5), characterised in that the actuating element (7) is of dome-shaped construction and that the resilient tongue (4) is lifted from the contact carrier (1) in the region of the opposite contact (5) and is bent into the dome.
2. A push-button switch as claimed in Claim 1, characterised in that the insulating sheet (3) rests directly on the contact carrier (1) and that the opposite contact (5) is disposed in the region of the free end of the tongue (4) and is situated opposite a pair of associated contacts (2).
3. A push-button switch as claimed in Claim 1 or 2, characterised in that a web (8) of the actuating element, which web is pivotally attached above the foot (10) of the tongue (4), extends in the direction of the tongue (4), ends above the free end of the tongue (4) and comprises an actuating surface (11).
4. A push-button switch as claimed in Claim 3, characterised in that the web (8) originates from the edge of a round aperture (9) embracing the tongue (4) in a covering sheet (6) covering the sheet (4) and is raised above the plane of the covering sheet (6).
5. A push-button switch as claimed in Claim 4, characterised in that the web (8) is connected to the rest of the edge of the aperture (9) via a tapered supporting membrane (12).
6. A push-button switch as claimed in Claim 1 or one of the following, characterised in that a raised portion is provided in the region of the foot (10) of the tongue (4) and lifts the tongue (4) from the contact (2) in the unactuated state.
EP82107034A 1981-09-08 1982-08-04 Key switch Expired EP0073932B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82107034T ATE16870T1 (en) 1981-09-08 1982-08-04 BUTTON SWITCH.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3135427 1981-09-08
DE3135427A DE3135427C2 (en) 1981-09-08 1981-09-08 Push button switch

Publications (2)

Publication Number Publication Date
EP0073932A1 EP0073932A1 (en) 1983-03-16
EP0073932B1 true EP0073932B1 (en) 1985-12-04

Family

ID=6141074

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82107034A Expired EP0073932B1 (en) 1981-09-08 1982-08-04 Key switch

Country Status (3)

Country Link
EP (1) EP0073932B1 (en)
AT (1) ATE16870T1 (en)
DE (1) DE3135427C2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3403034A1 (en) * 1984-01-28 1985-08-01 Schoeller & Co Elektrotechnische Fabrik Gmbh & Co, 6000 Frankfurt KEY SWITCH
DE3734021C2 (en) * 1987-10-08 1996-11-14 Telefunken Microelectron Process for the production of push buttons
DE102011122862B3 (en) * 2011-05-30 2018-11-15 Heraeus Deutschland GmbH & Co. KG Laminate for producing a switch, switch and laminate web with laminate elements of such a laminate and method for producing such a laminate
DE102011103598B4 (en) * 2011-05-30 2017-04-06 Heraeus Deutschland GmbH & Co. KG Laminate for making a switch

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3290439A (en) * 1963-04-29 1966-12-06 Willcox Data encoding keyboard
US3240885A (en) * 1963-05-07 1966-03-15 Western Electric Co Multiple switching apparatus
US3800104A (en) * 1972-11-13 1974-03-26 Becton Dickinson Co Low profile keyboard switch assembly with snap action cantilever contact
US4005293A (en) * 1974-11-29 1977-01-25 Texas Instruments Incorporated Pushbutton keyboard switch assembly having individual concave-convex contacts integrally attached to conductor strips
NL7700721A (en) * 1976-03-17 1977-09-20 Tektronix Inc SWITCHING DEVICE.
US4078257A (en) * 1976-08-23 1978-03-07 Hewlett-Packard Company Calculator apparatus with electronically alterable key symbols
US4128744A (en) * 1977-02-22 1978-12-05 Chomerics, Inc. Keyboard with concave and convex domes
JPS6050590B2 (en) * 1977-08-18 1985-11-09 第一電子工業株式会社 Flexible laminates for printed circuit boards
GB2023935B (en) * 1978-06-08 1982-08-25 Nissan Motor Electric switch
FR2460444A1 (en) * 1979-07-04 1981-01-23 Jaeger LIGHTING DEVICE FOR KEYBOARDS
US4321441A (en) * 1980-02-04 1982-03-23 Xerox Corporation Keyswitch arrangement

Also Published As

Publication number Publication date
DE3135427C2 (en) 1985-07-18
EP0073932A1 (en) 1983-03-16
ATE16870T1 (en) 1985-12-15
DE3135427A1 (en) 1983-04-21

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