EP0073932A1 - Key switch - Google Patents

Key switch Download PDF

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Publication number
EP0073932A1
EP0073932A1 EP82107034A EP82107034A EP0073932A1 EP 0073932 A1 EP0073932 A1 EP 0073932A1 EP 82107034 A EP82107034 A EP 82107034A EP 82107034 A EP82107034 A EP 82107034A EP 0073932 A1 EP0073932 A1 EP 0073932A1
Authority
EP
European Patent Office
Prior art keywords
tab
film
contact
key switch
switch according
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
EP82107034A
Other languages
German (de)
French (fr)
Other versions
EP0073932B1 (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
Licentia Patent Verwaltungs 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, Licentia Patent Verwaltungs 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 key switch according to the preamble of the first claim.
  • the invention has for its object to take measures in a key switch designed according to the preamble of the first claim, through which a relatively rigid film can be applied and stretching of the film is avoided.
  • the bending elasticity of the film is used, so that stretching of the film is no longer necessary.
  • the film is only slightly stressed, so that an increased service life or functional reliability is achieved.
  • thicker films can be used, the production and processing of which is easier and simpler than that of thin films.
  • the film consists of electrically insulating material and lies directly on the contact carrier, the tab being lifted off the contact carrier in the area of the mating contact.
  • 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 harnessge over the level of the cover sheet 6 is pulled and the tab 4 engages.
  • 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 serving as the actuating surface 11.
  • 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 tab 4 is in the unactuated state in the plane of the film 3.
  • a spacer film 13 is therefore inserted between the film 3 and the contact carrier 1 and has 2.5 cutouts 14 in the region of the contacts. This ensures the necessary distance between the contacts 2 and the counter contacts 5.
  • the tab 4 is pressed by the snap action of the dome-shaped actuating element 7 via the actuating nose 15 against the assigned contacts 2 in the manner of a snap switch. Due to the inherent elasticity of the film 3, the tab 4 then pivots into its flat starting position after releasing the actuating element 7, i.e. back to the level of slide 3.
  • the film 3 consisting of insulating material lies directly on the contact carrier 1.
  • the tabs 4 on their foot 10 are opposite the The plane of the film 3 is bent by permanent deformation at an acute angle so that the mating contacts 5 are lifted off from the contacts 2 in an oblique position.
  • 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.

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 Tastenschalter gemäß dem Oberbegriff des ersten Anspruchs.The invention relates to a key switch according to the preamble of the first claim.

Bei einem bekannten Tastenschalter dieser Art (US-PS 4 078 257) liegt auf einem Kontaktträger eine Abstandsfolie mit Durchbrüchen im Bereich von aufgedruckten oder aufgedampften Kontakten. Auf die Abstandsfolie ist eine durchgehende Folie aufgelegt, welche im Bereich der Durchbrüche ebenfalls mit Gegenkontakten versehen ist. Als Betätigungselement ist oberhalb der Kontaktbereiche ein in eine weitere Folie eingeformter Betätigungsknopf vorgesehen. Durch Druck auf den Betätigungsknopf wird die Folie so weit gestreckt, bis die darin angeordneten Kontaktflächen durch den Durchbruch hindurch in Berührung mit den auf dem Kontaktträger angeordneten Kontakt kommen. Bei dieser Ausgestaltung muß die verformbare Folie dünn sein, damit die zur Streckung der Folie erforderliche Betätigungskraft annehmbare Werte aufweist. Dünne Folien sind jedoch schwierig zu verarbeiten. Außerdem wird die Folie beim Hindurchdrücken durch den Durchbruch zwangsläufig gereckt wodurch die Gefahr besteht, daß eine bleibende Verformung eintritt und eine sichere Trennung der Kontakte nicht mehr gewährleistet ist.In a known key switch of this type (US Pat. No. 4,078,257) there is a spacer film with openings in the area of printed or vapor-deposited contacts on a contact carrier. A continuous film is placed on the spacer film, which is also provided with mating contacts in the area of the openings. An actuation button molded into a further film is provided as the actuation element above the contact areas. By pressing the actuation button, the film is stretched until the contact surfaces arranged therein come through the opening into contact with the contact arranged on the contact carrier. In this configuration, the deformable film must be thin so that the actuation force required to stretch the film has acceptable values. However, thin films are difficult to process. In addition, the film is inevitably stretched when it is pushed through the breakthrough, so there is a risk of permanent deformation occurs and a safe separation of the contacts is no longer guaranteed.

Der Erfindung liegt die Aufgabe zugrunde, bei einem gemäß dem Oberbegriff des ersten Anspruchs ausgebildeten Tastenschalter Maßnahmen zu treffen, durch die eine relativ steife Folie angewandt werden kann und eine Reckung der Folie vermieden wird.The invention has for its object to take measures in a key switch designed according to the preamble of the first claim, through which a relatively rigid film can be applied and stretching of the film is avoided.

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

Bei einer Ausgestaltung gemäß der Erfindung wird die Biegeelastizität der Folie ausgenutzt, so daß ein Recken der Folie nicht mehr erforderlich ist. Die Folie wird dadurch nur gering beansprucht, so daß eine erhöhte Lebensdauer bzw. Funktionssicherheit erreicht wird. Außerdem können dickere Folien zur Anwendung kommen, deren Herstellung und Verarbeitung leichter und einfacher als bei demgegenüber dünnen Folien ist.In an embodiment according to the invention, the bending elasticity of the film is used, so that stretching of the film is no longer necessary. The film is only slightly stressed, so that an increased service life or functional reliability is achieved. In addition, thicker films can be used, the production and processing of which is easier and simpler than that of thin films.

Gemäß einer vorteilhaften Ausgestaltung besteht die Folie aus elektrisch isolierendem Material und liegt unmittelbar auf dem Kontaktträger auf, wobei die Lasche im Bereich des Gegenkontaktes von dem Kontaktträger abgehoben ist. Hierdurch wird die Anwendung einer mit Durchbrüchen zu versehenden Abstandsfolie überflüssig.According to an advantageous embodiment, the film consists of electrically insulating material and lies directly on the contact carrier, the tab being lifted off the contact carrier in the area of the mating contact. As a result, the use of a spacer film to be provided with openings is superfluous.

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

Die Erfindung ist nachfolgend anhand der Zeichnungen von Aus-. führungsbeispielen näher erläutert.The invention is based on the drawings of Aus. management examples explained in more detail.

Es zeigen:

  • Figur 1. einen Querschnitt durch einen Tastenschaltermit in der Ebene der Folie liegender Lasche,
  • Figur 2 eine Draufsicht auf die mit der Lasche versehene Folie,
  • Figur 3 einen Querschnitt durch eine Tastenschalteranordnung mit angehobener Lasche und ,
  • Figur 4 eine Draufsicht auf die mit dem gemäß Figur 3 ausgebildeten Laschen versehene Folie.
Show it:
  • FIG. 1 shows a cross section through a key switch with a tab lying in the plane of the film,
  • FIG. 2 shows a top view of the film provided with the tab,
  • FIG. 3 shows a cross section through a key switch arrangement with the tab raised, and
  • Figure 4 is a plan view of the film provided with the tabs formed according to Figure 3.

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 Leitungsb-ahnen 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 hochge over the level of the cover sheet 6 is pulled and the tab 4 engages. 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 serving as the actuating surface 11. 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.

Gemäß den Figuren 1 und 2 befinden sich die Lasche 4 im unbetätigten Zustand in der Ebene der Folie 3. Es ist daher zwischen die Folie 3 und den Kontaktträger 1 eine Abstandsfolie 13 eingesetzt, die im Bereich der Kontakte 2,5 Aussparungen 14 aufweist. Hierdurch wird der-notwendige Abstand zwischen den Kontakten 2 und den Gegenkontakten 5 sichergestellt. 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 plane Ausgangslage, d.h. in die Ebene der Folie 3 zurück.According to FIGS. 1 and 2, the tab 4 is in the unactuated state in the plane of the film 3. A spacer film 13 is therefore inserted between the film 3 and the contact carrier 1 and has 2.5 cutouts 14 in the region of the contacts. This ensures the necessary distance between the contacts 2 and the counter contacts 5. By pressing the actuating surface 11, which has an actuating nose 15 on its inside, the tab 4 is pressed by the snap action of the dome-shaped actuating element 7 via the actuating nose 15 against the assigned contacts 2 in the manner of a snap switch. Due to the inherent elasticity of the film 3, the tab 4 then pivots into its flat starting position after releasing the actuating element 7, i.e. back to the level of slide 3.

Bei einer Ausgestaltung des Tastenschalters gemäß den Figuren 3 und 4 liegt die aüs.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 a configuration of the key switch according to FIGS. 3 and 4, the film 3 consisting of insulating material lies directly on the contact carrier 1. In order to prevent the contacts 2 from touching the mating contact 5, the tabs 4 on their foot 10 are opposite the The plane of the film 3 is bent by permanent deformation at an acute angle so that the mating contacts 5 are lifted off from the contacts 2 in an oblique position. 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.

Claims (7)

1. Tastschalter mit einem Kontaktträger, zu dem parallel eine Folie aus elastischem Material angeordnet ist, welche mit Abstand von wenigstens einem Kontakt des Kontaktträgers angeordnet einen Gegenkontakt trägt, sowie mit einem oberhalb der Kontakte angeordneten, verstellbaren Betätigungselement, dadurch gekennzeichnet, daß die Folie (3) eine freigestanzte Lasche (4) aufweist, an welcher der Gegenkon- t2kt (5) angeordnet ist.1. Pushbutton switch with a contact carrier, to which a film of elastic material is arranged in parallel, which carries a counter contact at a distance from at least one contact of the contact carrier, and with an adjustable actuating element arranged above the contacts, characterized in that the film ( 3) has a punched-out tab (4) on which the counter contact 2 kt (5) is arranged. 2. Tastschalter nach Anspruch 1,dadurch gekennzeichnet, daß die Folie (3) aus elektrisch isolierendem Material besteht sowie unmittelbar auf dem Kontaktträger (1) aufliegt und daß die Lasche (4) im Bereich des Gegenkontaktes (5) von dem Kontaktträger (1) abgehoben ist.2. Key switch according to claim 1, characterized in that the film (3) consists of electrically insulating material and rests directly on the contact carrier (1) and that the tab (4) in the area of the mating contact (5) from the contact carrier (1) is lifted off. 3. Tastschalter nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Lasche (4) an ihrem Fuß (10) gegenüber der Ebene der Folie (3) bleibend in einem spitzen Winkel abgeknickt ist.3. Key switch according to claim 1 or 2, characterized in that the tab (4) on its foot (10) relative to the plane of the film (3) is permanently bent at an acute angle. 4. Tastschalter nach Anspruch 2 oder 3, dadurch gekennzeichnet, daß das Betätigungselement (7) domförmig ausgebildet ist und daß die Lasche (4) in den Dom eingreift.4. Key switch according to claim 2 or 3, characterized in that the actuating element (7) is dome-shaped and that the tab (4) engages in the dome. 5. Tastschalter nach Anspruch 1 oder einem der folgenden, dadurch gekennzeichnet, daß in Richtung der Lasche (4) ein oberhalb des Fußes (10) der Lasche (4) schwenkbar angesetzter Steg (8) des Betätigungselementes (7) verläuft, der über dem freien Ende der Lasche (4) endet und eine Betätigungsfläche 11 aufweist.5. Key switch according to claim 1 or one of the following, characterized in that in the direction of the tab (4) above the foot (10) of the tab (4) pivotally attached web (8) of the actuating element (7) which extends over the free end of the tab (4) ends and has an actuating surface 11. 6. Tastschalter nach Anspruch 5, dadurch gekennzeichnet, daß der Steg (8) vom Rand eines runden, die Lasche (4) umgreifenden Durchbruchs (9) in einer die Folie (4) überdeckenden Abdeckfolie (6) .ausgeht und über die Ebene der.Abdeckfolie (6) hochgezogen ist.6. Pushbutton switch according to claim 5, characterized in that the web (8) from the edge of a round, the tab (4) encompassing opening (9) in a foil (4) covering cover sheet (6) .The cover film (6) is pulled up. 7. Tastschalter nach Anspruch 6, dadurch gekennzeichnet, daß der Steg (8) über eine kegelförmige Stützhaut (12) mit dem übrigen Rand des Durchbruchs (9) verbunden ist.7. Key switch according to claim 6, characterized in that the web (8) is connected via a conical support skin (12) to the rest of the opening (9).
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
DE3135427A DE3135427C2 (en) 1981-09-08 1981-09-08 Push button switch
DE3135427 1981-09-08

Publications (2)

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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011103598A1 (en) * 2011-05-30 2012-12-06 Heraeus Materials Technology Gmbh & Co. Kg Switching element produced by punch-laminating technique
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

Families Citing this family (2)

* 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

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US3240885A (en) * 1963-05-07 1966-03-15 Western Electric Co Multiple switching apparatus
US3290439A (en) * 1963-04-29 1966-12-06 Willcox Data encoding keyboard
FR2344944A1 (en) * 1976-03-17 1977-10-14 Tektronix Inc Switching mechanism with movable contact - has base plate fixed contact and movable resinous application element activated by control mechanism defining switch positions (NL 20.9.77)
US4078257A (en) * 1976-08-23 1978-03-07 Hewlett-Packard Company Calculator apparatus with electronically alterable key symbols
FR2400820A1 (en) * 1977-08-18 1979-03-16 Bunker Ramo Flexible laminated plate for printed circuit - comprises polyamide resin plastic film with copper foil contacts etc., and e.g. cadmium-copper alloy backing layer
FR2428315A1 (en) * 1978-06-08 1980-01-04 Nissan Motor LOW THICKNESS SWITCHING DEVICE WITH DESCRIPTIVE DIAGRAM
GB2053574A (en) * 1979-07-04 1981-02-04 Jaeger Illuminated keyboard
US4321441A (en) * 1980-02-04 1982-03-23 Xerox Corporation Keyswitch arrangement

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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
US4128744A (en) * 1977-02-22 1978-12-05 Chomerics, Inc. Keyboard with concave and convex domes

Patent Citations (8)

* 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
FR2344944A1 (en) * 1976-03-17 1977-10-14 Tektronix Inc Switching mechanism with movable contact - has base plate fixed contact and movable resinous application element activated by control mechanism defining switch positions (NL 20.9.77)
US4078257A (en) * 1976-08-23 1978-03-07 Hewlett-Packard Company Calculator apparatus with electronically alterable key symbols
FR2400820A1 (en) * 1977-08-18 1979-03-16 Bunker Ramo Flexible laminated plate for printed circuit - comprises polyamide resin plastic film with copper foil contacts etc., and e.g. cadmium-copper alloy backing layer
FR2428315A1 (en) * 1978-06-08 1980-01-04 Nissan Motor LOW THICKNESS SWITCHING DEVICE WITH DESCRIPTIVE DIAGRAM
GB2053574A (en) * 1979-07-04 1981-02-04 Jaeger Illuminated keyboard
US4321441A (en) * 1980-02-04 1982-03-23 Xerox Corporation Keyswitch arrangement

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IBM TECHNICAL DISCLOSURE BULLETIN, Band 16, Nr. 3, August 1973, Seite 954, New York, USA *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011103598A1 (en) * 2011-05-30 2012-12-06 Heraeus Materials Technology Gmbh & Co. Kg Switching element produced by punch-laminating technique
DE102011103598B4 (en) * 2011-05-30 2017-04-06 Heraeus Deutschland GmbH & Co. KG Laminate for making a switch
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

Also Published As

Publication number Publication date
DE3135427C2 (en) 1985-07-18
EP0073932B1 (en) 1985-12-04
ATE16870T1 (en) 1985-12-15
DE3135427A1 (en) 1983-04-21

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