EP0498161A1 - Flexible push-button switch - Google Patents

Flexible push-button switch Download PDF

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Publication number
EP0498161A1
EP0498161A1 EP92100369A EP92100369A EP0498161A1 EP 0498161 A1 EP0498161 A1 EP 0498161A1 EP 92100369 A EP92100369 A EP 92100369A EP 92100369 A EP92100369 A EP 92100369A EP 0498161 A1 EP0498161 A1 EP 0498161A1
Authority
EP
European Patent Office
Prior art keywords
layer
insulating material
contact surfaces
core
flexible
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
EP92100369A
Other languages
German (de)
French (fr)
Other versions
EP0498161B1 (en
Inventor
Klaus Wolkewitz
Siegfried Vogt
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.)
Blaupunkt Werke GmbH
Original Assignee
Blaupunkt Werke 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 Blaupunkt Werke GmbH filed Critical Blaupunkt Werke GmbH
Publication of EP0498161A1 publication Critical patent/EP0498161A1/en
Application granted granted Critical
Publication of EP0498161B1 publication Critical patent/EP0498161B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01H2215/00—Tactile feedback
    • H01H2215/004—Collapsible dome or bubble
    • H01H2215/006—Only mechanical function
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2215/00—Tactile feedback
    • H01H2215/004—Collapsible dome or bubble
    • H01H2215/02—Reversed domes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2227/00—Dimensions; Characteristics
    • H01H2227/036—Minimise height

Definitions

  • the invention relates to a flexible push button switch according to the preamble of claim 1.
  • a flexible push button switch is known in which the keypad consists essentially of five flexible layers glued together, a cover layer, a distribution layer, an upper contact carrier layer, a spacer layer and a lower contact carrier layer.
  • the finger When pressed, the finger is pressed on the center of a button area marked on the cover layer.
  • the force exerted by the fingertip is transferred to the edge of an associated opening in the distribution layer. From this edge, the force has a direct effect on the rectangular contact ring and ensures contact between the contact surfaces of the contact carrier layers.
  • the invention has for its object to provide a flexible push button switch, in which the actuation is carried out via a button mounted in a cover plate.
  • the advantages achieved by the invention are, in particular, that the actuating element rules out an undesirable play in the height of the control button and, because of the snap action achieved, enables reliable contacting.
  • a lower insulating material layer 2 is arranged on a base plate 1 and is provided on its upper side with conductor tracks which have a switching contact surface 3 in the form of a ring.
  • a spacer layer 4 made of insulating material is arranged on the lower insulating material layer 2 and has a circular window opening F, the diameter of which is larger than the outer diameter of the switching contact surface 3.
  • the conductor tracks provided on the underside of the upper insulating material layer 5 have a further switching contact surface 6 in the form of a ring, which is aligned with the switching contact surface 3 of the lower insulating material layer 2.
  • the upper insulating layer 5 is provided with a circular recess 7, the Diameter corresponds to the inner diameter of the switching contact surface 6 in the form of a ring.
  • An actuator 8 made in one piece from a flexible plastic consists of a cylindrical block-shaped core 9, on which a hollow cylindrical circular ring part 11 is formed by means of funnel-shaped walls 10, the lower part of which surrounds the upper part of the core 9 at a predetermined distance .
  • a cap-shaped control button 12 is fastened, which is mounted in a bore 13 of a cover plate 14 and rests with an annular shape jump 15 on the underside of the cover plate 14.
  • the block-shaped core 9 is supported with its lower end face 16 on the lower insulating layer 2.
  • the actuating member 8 is designed and arranged such that the lower end face of the ring part 11 is at a predetermined distance A from the upper insulating layer 5, which can be overcome as a switching path when a key is pressed, the snap-action walls according to FIG. 2 resulting from the funnel-shaped walls 10 which brings the lower end face 17 of the ring part 8 into contact with the switching contact surfaces 3, 6.
  • the key switch is not limited to a single key. Several button arrangements can of course be assigned to the insulating films.

Landscapes

  • Push-Button Switches (AREA)

Abstract

The invention relates to a flexible push-button switch, in which a spacer layer (4), which separates the contact surfaces (3, 6) from one another, is provided between two insulating material layers (2, 5) which are provided between electrical switch contact surfaces (3, 6) that are of annular construction. When pressure is exerted on an operating push-button (12), an actuating element (8) which is connected thereto produces a snap effect which brings the contact surfaces (3, 6) into contact with the insulating material layers (2, 5). <IMAGE>

Description

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

Bei einem flexiblen Tastschalter werden mit elektrischen Leiterbahnen versehene flexible Isolierstoffschichten, welche durch eine Abstandsschicht voneinander getrennt sind, mittels eines Betätigungsgliedes manuell derart verformt, daß eine kontaktgebende Berührung zwischen den als Schaltkontaktflächen ausgebildeten Leiterbahnen während der Betätigungsdauer erfolgt.In the case of a flexible pushbutton switch, flexible insulating layers provided with electrical conductor tracks, which are separated from one another by a spacing layer, are manually deformed by means of an actuating member in such a way that contact is made between the conductor tracks designed as switch contact surfaces during the actuation period.

Aus der DE-OS 29 21 557 ist ein flexibler Tastschalter bekannt, bei dem das Tastenfeld im wesentlichen aus fünf miteinander verklebten flexiblen Schichten, einer Deckschicht, einer Verteilerschicht, einer oberen Kontaktträgerschicht, einer Distanzschicht und einer unteren Kontaktträgerschicht besteht. Bei einer Betätigung wird mit dem Finger auf die Mitte einer auf der Deckschicht markierten Tastenfläche gedrückt. Die von der Fingerkuppe ausgeübte Kraft geht bei der Verteilerschicht auf den Rand einer zugehörigen Öffnung über. Von diesem Rand wirkt sich die Kraft unmittelbar auf den rechteckförmigen Kontaktring aus und sorgt für eine Kontaktgabe zwischen den Kontaktflächen der Kontaktträgerschichten.From DE-OS 29 21 557 a flexible push button switch is known in which the keypad consists essentially of five flexible layers glued together, a cover layer, a distribution layer, an upper contact carrier layer, a spacer layer and a lower contact carrier layer. When pressed, the finger is pressed on the center of a button area marked on the cover layer. The force exerted by the fingertip is transferred to the edge of an associated opening in the distribution layer. From this edge, the force has a direct effect on the rectangular contact ring and ensures contact between the contact surfaces of the contact carrier layers.

Der Erfindung liegt die Aufgabe zugrunde, einen flexiblen Tastschalter zu schaffen, bei dem die Betätigung über einen in einer Deckplatte gelagerten Tastenknopf erfolgt.The invention has for its object to provide a flexible push button switch, in which the actuation is carried out via a button mounted in a cover plate.

Diese Aufgabe wird erfindungsgemäß durch die im kennzeichnenden Teil des Anspruchs 1 angegebenen Maßnahmen gelöst.This object is achieved by the measures specified in the characterizing part of claim 1.

Die mit der Erfindung erzielten Vorteile bestehen insbesondere darin, daß das Betätigungsglied ein unerwünschtes Höhenspiel der Bedientaste ausschließt und aufgrund der erzielten Schnappwirkung eine sichere Kontaktgabe ermöglicht.The advantages achieved by the invention are, in particular, that the actuating element rules out an undesirable play in the height of the control button and, because of the snap action achieved, enables reliable contacting.

Durch die in den Unteransprüchen angeführten Maßnahmen sind vorteilhafte Ausgestaltungen des im Anspruch 1 angegebenen Tastschalters möglich.Advantageous refinements of the push button switch specified in claim 1 are possible through the measures specified in the subclaims.

Ein Ausführungsbeispiel der Erfindung ist mit den erfindungswesentlichen Bauteilen in der Zeichnung dargestellt und wird im folgenden näher beschrieben.An embodiment of the invention is shown with the components essential to the invention in the drawing and is described in more detail below.

Es zeigen

Fig. 1
eine prinzipielle Schnittzeichnung eines flexiblen Tastschalters und
Fig. 2
ein Schaltweg-Schaltkraft-Diagramm.
Show it
Fig. 1
a basic sectional drawing of a flexible push button and
Fig. 2
a shift travel shift force diagram.

Auf einer Grundplatte 1 ist eine untere Isolierstoffschicht 2 angeordnet, welche an ihrer Oberseite mit Leiterbahnen versehen ist, die eine kreisringförmig ausgebildete Schaltkontaktfläche 3 aufweisen. Auf der unteren Isolierstoffschicht 2 ist eine aus Isolierstoff bestehende Abstandsschicht 4 angeordnet, welche eine kreisförmige Fensteröffnung F aufweist, deren Durchmesser größer als der äußere Durchmesser der Schaltkontaktfläche 3 ist. Eine obere Isolierstoffschicht 5, welche aus einem Leiterbahnen aufweisenden flexiblen Kunststoff besteht, ist auf der Abstandsschicht 4 angeordnet. Die an der Unterseite der oberen Isolierstoffschicht 5 vorgesehenen Leiterbahnen weisen eine weitere kreisringförmig ausgebildete Schaltkontaktfläche 6 auf, die zu der Schaltkontaktfläche 3 der unteren Isolierstoffschicht 2 ausgerichtet ist. Die obere Isolierstoffschicht 5 ist mit einer kreisrunden Aussparung 7 versehen, deren Durchmesser dem inneren Durchmesser der kreisringförmig ausgebildeten Schaltkontaktfläche 6 entspricht. Ein aus einem flexiblen Kunststoff einstückig hergestelltes Betätigungsglied 8 besteht aus einem zylindrischen blockförmig ausgebildeten Kern 9, an den über trichterförmig ausgebildete Wandungen 10 ein hohlzylinderförmig ausgebildeter umlaufender Ringteil 11 angeformt ist, welcher mit seinem unteren Teil in einen vorgegebenen Abstand den oberen Teil des Kerns 9 umschließt. An der Oberseite des Ringteils 11 ist eine kappenförmig ausgebildete Bedientaste 12 befestigt, welche in einer Bohrung 13 einer Deckplatte 14 gelagert ist und mit einem ringförmigen Formsprung 15 an der Unterseite der Deckplatte 14 anliegt. Der blockförmige Kern 9 stützt sich mit seiner unteren Stirnfläche 16 auf der unteren Isolierstoffschicht 2 ab. Das Betätigungsglied 8 ist derart ausgebildet und angeordnet, daß die untere Stirnfläche des Ringteils 11 einen vorgegebenen Abstand A zur oberen Isolierstoffschicht 5 aufweist, der bei einer Tastenbetätigung als Schaltweg zu überwinden ist, wobei infolge der trichterförmigen Wandungen 10 eine Schnappwirkung nach Figur 2 erfolgt, bei der die untere Stirnfläche 17 des Ringteils 8 die Schaltkontaktflächen 3, 6 in kontaktgebende Berührung bringt.A lower insulating material layer 2 is arranged on a base plate 1 and is provided on its upper side with conductor tracks which have a switching contact surface 3 in the form of a ring. A spacer layer 4 made of insulating material is arranged on the lower insulating material layer 2 and has a circular window opening F, the diameter of which is larger than the outer diameter of the switching contact surface 3. An upper insulating layer 5, which consists of a flexible plastic having conductor tracks, is arranged on the spacer layer 4. The conductor tracks provided on the underside of the upper insulating material layer 5 have a further switching contact surface 6 in the form of a ring, which is aligned with the switching contact surface 3 of the lower insulating material layer 2. The upper insulating layer 5 is provided with a circular recess 7, the Diameter corresponds to the inner diameter of the switching contact surface 6 in the form of a ring. An actuator 8 made in one piece from a flexible plastic consists of a cylindrical block-shaped core 9, on which a hollow cylindrical circular ring part 11 is formed by means of funnel-shaped walls 10, the lower part of which surrounds the upper part of the core 9 at a predetermined distance . On the top of the ring part 11, a cap-shaped control button 12 is fastened, which is mounted in a bore 13 of a cover plate 14 and rests with an annular shape jump 15 on the underside of the cover plate 14. The block-shaped core 9 is supported with its lower end face 16 on the lower insulating layer 2. The actuating member 8 is designed and arranged such that the lower end face of the ring part 11 is at a predetermined distance A from the upper insulating layer 5, which can be overcome as a switching path when a key is pressed, the snap-action walls according to FIG. 2 resulting from the funnel-shaped walls 10 which brings the lower end face 17 of the ring part 8 into contact with the switching contact surfaces 3, 6.

Infolge der Elastizität der trichterförmigen Wandungen 10 des Betätigungsgliedes 8 wird ein unerwünschtes Höhenspiel der Bedientaste 12 ausgeschlossen. Der Tastenschalter ist nicht auf eine einzige Taste beschränkt. Den Isolierstoffolien können selbstverständlich mehrere Tastenanordnungen zugeordnet sein.As a result of the elasticity of the funnel-shaped walls 10 of the actuating element 8, an undesirable height play of the control button 12 is excluded. The key switch is not limited to a single key. Several button arrangements can of course be assigned to the insulating films.

Claims (5)

Flexibler Tastschalter, bei dem zwischen zwei Leiterbahnen tragenden Isolierstoffschichten eine mit einer Fensteröffnung versehene Abstandsschicht vorgesehen ist, welche die obere und die untere Schicht voneinander trennt und bei dem die aus flexiblen Kunststoff bestehende obere Schicht auf ihrer der unteren Schicht gegenüberliegenden Oberfläche elektrisch leitende, ringförmig ausgebildete Schaltkontaktflächen trägt, die zu leitenden Schaltkontaktflächen der unteren Schicht ausgerichtet sind, wobei mittels eines manuell bedienbaren Betätigungsgliedes nach innen über den Randbereich der Abtastschichtfensteröffnung ragende Schaltkontaktflächen der oberen Schicht zur Kontaktgabe an die ihnen zugeordneten Schaltkontaktflächen der unteren Schicht drückbar sind,
dadurch gekennzeichnet,
daß das aus flexiblem Kunststoff einstückig hergestellte Betätigungsglied (8) einen blockförmigen Kern (9) aufweist, an dem über trichterförmig ausgebildete Wandungen (10) ein umlaufender Ringteil (11) angeformt ist, welcher mit seinem unteren Teil in einen vorgegebenen Abstand den oberen Teil des Kerns (9) umschließt und mit seinem oberen Teil an einer Bedientaste (12) befestigt ist und daß das Betätigungsglied (8) derart ausgebildet und angeordnet ist, daß sich der blockförmige Kern (9) mit seiner unteren Stirnfläche (17) auf der die Isolierstoffschichten (2, 5) tragenden Grundplatte (1) abstützt, wobei die obere Isolierstoffschicht (5) eine Aussparung (7) für den Kern (9) aufweist, daß die untere Stirnfläche (17) des Ringteils (11) einen vorgegebenen Abstand (A) zur oberen Isolierstoffschicht (5) aufweist und daß bei einer axialen Druckausübung auf das Betätigungsglied (8) infolge der trichterförmigen Wandungen (10) eine Schnappwirkung erfolgt, bei der die untere Stirnfläche (17) des Ringteils (11) die Schaltkontaktflächen (6) der oberen Isolierstoffschicht (5) mit den Schaltkontaktflächen (3) der unteren Isolierstoffschicht (2) in kontaktgebende Berührung bringt.Flexible pushbutton switch, in which a spacer layer provided with a window opening is provided between two insulating material layers carrying conductor tracks, which separates the upper and the lower layer and in which the upper layer, which is made of flexible plastic, has an annular, electrically conductive surface on its surface opposite the lower layer Carries switching contact surfaces which are aligned with conductive switching contact surfaces of the lower layer, switching contact surfaces of the upper layer projecting inward beyond the edge region of the scanning layer window opening being able to be pressed by means of a manually operated actuating element for making contact with the switching contact surfaces of the lower layer assigned to them,
characterized,
that the one-piece actuator made of flexible plastic (8) has a block-shaped core (9), on which a circumferential ring part (11) is formed on the funnel-shaped walls (10), which with its lower part at a predetermined distance the upper part of the Core (9) encloses and is attached with its upper part to a control button (12) and that the actuator (8) is designed and arranged such that the block-shaped core (9) with its lower end face (17) on which the layers of insulating material (2, 5) supporting base plate (1), the upper insulating material layer (5) having a recess (7) for the core (9) such that the lower end face (17) of the ring part (11) a predetermined distance (A) to the upper insulating material layer (5) and that when the pressure is exerted axially on the actuating member (8) as a result of the funnel-shaped walls (10) there is a snap action in which the lower End face (17) of the ring part (11) the switch contact surfaces (6) of the upper insulating layer (5) brings into contact with the switch contact surfaces (3) of the lower insulating material layer (2). Flexibler Tastschalter nach Anspruch 1,
dadurch gekennzeichnet,
daß die ringförmig ausgebildeten Schaltkontaktflächen (3, 6) der Isolierstoffschichten (2, 5), der unteren Stirnfläche (17) des Betätigungsgliedringes (11) zugeordnet sind.Flexible key switch according to claim 1,
characterized,
that the ring-shaped switching contact surfaces (3, 6) of the insulating layers (2, 5), the lower end face (17) of the actuator ring (11) are assigned. Flexibler Tastschalter nach einem der Ansprüche 1 oder 2,
dadurch gekennzeichnet,
daß die untere Isolierstoffschicht (2) im Bereich zwischen der Grundplatte (1) und dem Kern (9) des Betätigungsgliedes (8) als geschlossene Schicht ausgebildet ist.Flexible key switch according to one of claims 1 or 2,
characterized,
that the lower insulating material layer (2) in the area between the base plate (1) and the core (9) of the actuating member (8) is designed as a closed layer. Flexibler Tastschalter nach einem der Ansprüche 1 oder 2,
dadurch gekennzeichnet,
daß die untere Isolierstoffschicht (2) im Bereich des Kerns (9) des Betätigungsgliedes (8) eine Aussparung aufweist, so daß diese auf der Grundplatte (1) anliegt.Flexible key switch according to one of claims 1 or 2,
characterized,
that the lower insulating material layer (2) has a recess in the area of the core (9) of the actuating member (8), so that it rests on the base plate (1). Flexibler Tastschalter nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet,
daß der blockförmige Kern (9) zylinderförmig und der Ringteil (11) hohlzylinderförmig ausgebildet sind.Flexible push button switch according to one of claims 1 to 4, characterized in
that the block-shaped core (9) is cylindrical and the ring part (11) is hollow cylindrical.
EP19920100369 1991-02-02 1992-01-11 Flexible push-button switch Expired - Lifetime EP0498161B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19914103150 DE4103150C1 (en) 1991-02-02 1991-02-02
DE4103150 1991-02-02

Publications (2)

Publication Number Publication Date
EP0498161A1 true EP0498161A1 (en) 1992-08-12
EP0498161B1 EP0498161B1 (en) 1994-10-19

Family

ID=6424241

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920100369 Expired - Lifetime EP0498161B1 (en) 1991-02-02 1992-01-11 Flexible push-button switch

Country Status (4)

Country Link
EP (1) EP0498161B1 (en)
JP (1) JPH04303528A (en)
DE (1) DE4103150C1 (en)
ES (1) ES2065073T3 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111508749A (en) * 2019-06-18 2020-08-07 光宝电子(广州)有限公司 Key structure and keyboard applying same

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4313870A1 (en) * 1993-04-28 1994-11-03 Becker Gmbh Push button

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3721778A (en) * 1971-06-21 1973-03-20 Chomerics Inc Keyboard switch assembly with improved operator and contact structure
DE7606008U1 (en) * 1976-02-28 1976-08-26 Preh, Elektrofeinmechanische Werke Jakob Preh Nachf., 8740 Bad Neustadt Push button switch
DE2921557A1 (en) * 1978-06-26 1980-01-17 Brady Co W H FLEXIBLE KEY SWITCH
FR2441886A1 (en) * 1978-11-17 1980-06-13 Rogers Corp TOUCH ELEMENT AND KEYBOARD COMPRISING THIS TOUCH ELEMENT
GB2054268A (en) * 1979-07-19 1981-02-11 Standard Telephones Cables Ltd Double-domed conductive disc
EP0117132A2 (en) * 1983-02-16 1984-08-29 Kabushiki Kaisha Ishida Koki Seisakusho Double integrating-type analog-to-digital converter

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8409257U1 (en) * 1984-03-26 1984-07-26 Ing. Gerhard Dekorsy GmbH, 7760 Radolfzell Device with at least one button

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3721778A (en) * 1971-06-21 1973-03-20 Chomerics Inc Keyboard switch assembly with improved operator and contact structure
DE7606008U1 (en) * 1976-02-28 1976-08-26 Preh, Elektrofeinmechanische Werke Jakob Preh Nachf., 8740 Bad Neustadt Push button switch
DE2921557A1 (en) * 1978-06-26 1980-01-17 Brady Co W H FLEXIBLE KEY SWITCH
FR2441886A1 (en) * 1978-11-17 1980-06-13 Rogers Corp TOUCH ELEMENT AND KEYBOARD COMPRISING THIS TOUCH ELEMENT
GB2054268A (en) * 1979-07-19 1981-02-11 Standard Telephones Cables Ltd Double-domed conductive disc
EP0117132A2 (en) * 1983-02-16 1984-08-29 Kabushiki Kaisha Ishida Koki Seisakusho Double integrating-type analog-to-digital converter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111508749A (en) * 2019-06-18 2020-08-07 光宝电子(广州)有限公司 Key structure and keyboard applying same
CN111508749B (en) * 2019-06-18 2022-02-15 光宝电子(广州)有限公司 Key structure and keyboard applying same

Also Published As

Publication number Publication date
DE4103150C1 (en) 1992-04-16
ES2065073T3 (en) 1995-02-01
EP0498161B1 (en) 1994-10-19
JPH04303528A (en) 1992-10-27

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