EP0392973B1 - Push button on printed circuit board - Google Patents

Push button on printed circuit board Download PDF

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Publication number
EP0392973B1
EP0392973B1 EP90810173A EP90810173A EP0392973B1 EP 0392973 B1 EP0392973 B1 EP 0392973B1 EP 90810173 A EP90810173 A EP 90810173A EP 90810173 A EP90810173 A EP 90810173A EP 0392973 B1 EP0392973 B1 EP 0392973B1
Authority
EP
European Patent Office
Prior art keywords
contact
board
tabs
key according
snap disc
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 - Lifetime
Application number
EP90810173A
Other languages
German (de)
French (fr)
Other versions
EP0392973A1 (en
Inventor
Peter Rothlin
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.)
Sulzer AG
Original Assignee
Sulzer AG
Gebrueder Sulzer 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 Sulzer AG, Gebrueder Sulzer AG filed Critical Sulzer AG
Publication of EP0392973A1 publication Critical patent/EP0392973A1/en
Application granted granted Critical
Publication of EP0392973B1 publication Critical patent/EP0392973B1/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
    • H01H13/02—Details
    • H01H13/26—Snap-action arrangements depending upon deformation of elastic members
    • H01H13/48—Snap-action arrangements depending upon deformation of elastic members using buckling of disc springs
    • 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
    • H01H13/7006—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 comprising a separate movable contact element for each switch site, all other elements being integrated in layers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2205/00—Movable contacts
    • H01H2205/016—Separate bridge contact
    • H01H2205/024—Means to facilitate positioning
    • H01H2205/03—Apertured plate
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2215/00—Tactile feedback
    • H01H2215/034—Separate snap action
    • H01H2215/036—Metallic disc
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2225/00—Switch site location
    • H01H2225/012—Switch site location normally closed

Definitions

  • the invention relates to a pushbutton on printed circuit boards with an electrically conductive snap disk which is embedded in a recess in a spacer layer between a cover film and the printed circuit board coated with conductor tracks.
  • FR-A-2 447 598 shows various forms of film pushbuttons, in which the partly moved conductor tracks are applied to deformable films, and conveys the principle of an opener in the form of a spiral spring clamped in by a film coated with a conductor track is lifted from its support on this conductor track.
  • Breaker buttons have the task of interrupting circuits with a direct effect for safety reasons. They must be characterized by a long service life and operational safety and must not cause incorrect switching due to shocks and vibrations. They are almost always used right next to the closing pushbuttons. Although pushbuttons have been used as closers for several years Membrane keyboards are used, there are hardly any equivalent designs for Openers. The object of the invention is therefore to create a pushbutton that is equivalent or better to be closed for membrane keyboards.
  • the figures show a pushbutton on a printed circuit board 1 with an electrically conductive snap disk 4, which is embedded in a recess in a spacer layer 2 between a cover film 3 and the printed circuit board 1 coated with conductor tracks 7.
  • the snap disk 4 has mutually offset contact tabs 5 and pull tabs 6, the draw tabs are anchored to the snap disk 4 on the printed circuit board 1 under tension and the contact tabs form an elastic yoke.
  • the contact tabs 5 are pretensioned on the conductor tracks 7 and, between the contact surface 8 and the disk plate 10, have a support knee 9 curved toward the printed circuit board 1.
  • the necessary actuating force When the snap disk 4 is pressed down in the actuating direction d, the necessary actuating force initially grows in an area 1 Fa and the contact force Fc until the support knee 9 is supported on the circuit board 1. Due to the shortened leverage between the support knee 9 and the disc plate 10, the necessary actuating force rises more steeply in an area II, the area between the support knee 9 and the disc plate 10 elastically deflecting, the knees originally preloaded from the contact surface 8 slidingly performing a pivoting movement and the contact force Fc decreases until the contact surface 8 lifts off the conductor track 7.
  • the resilient elements are dimensioned and matched to the height of the conductor track 7 in the area of the contact area 8 such that the contact areas 8 at the latest when the peak value for the actuating force Fa is reached.
  • the actuating force Fa initially decreases with progressive deformation in the actuating direction d until the snap disk plate is also seated on the printed circuit board and opposes substantially greater resistance, which protects the other snap disk areas from excessive stress.
  • the contact force Fa in the unactuated state depends on the pretension of the pull tabs 6, which center the snap disk on the one hand and on the other hand are guided in a preferred embodiment through recesses 11 in the printed circuit board 1 and are latched with protruding bends on the back of the printed circuit board 1. Other mounting options respectively. Abutments result from casting around, gluing or pressing on the pull tabs.
  • the play between the snap disk 4 and the cover sheet 3 is once with negative play, i.e. Overlap, used to increase the contact force Fc in the unactuated state and, on the other hand, serves to center the actuating finger when there is positive play.
  • a preferred application for the breaker buttons described is in gas refueling devices for motor vehicles.

Description

Die Erfindung bezieht sich auf eine Drucktaste an Leiterplatten mit einer elektrisch leitenden Schnappscheibe, die in einer Aussparung einer Distanzschicht zwischen einer Abdeckfolie und der mit Leiterbahnen beschichteten Leiterplatte eingebettet ist.The invention relates to a pushbutton on printed circuit boards with an electrically conductive snap disk which is embedded in a recess in a spacer layer between a cover film and the printed circuit board coated with conductor tracks.

Derartige Drucktasten mit Schnappscheiben sind als Folientastatur mit Druckpunkt in der DE-A-31 45 434 beschrieben. Es handelt sich um Schliesser, die bei mechanischer Betätigung einen elektischen Stromkreis kurzschliessen. Im weiteren zeigt die FR-A-2 447 598 verschiedende Formen von Foliendrucktasten, bei denen die zum Teil bewegten Leiterbahnen auf deformierbaren Folien aufgebracht sind, und vermittelt das Prinzip eines Oeffners in Form einer einseitig eingespannten Biegefeder, die durch eine mit einer Leiterbahn beschichtete Folie hindurch von ihrer Auflage auf dieser Leiterbahn abgehoben wird.Such push buttons with snap disks are described as a membrane keyboard with a pressure point in DE-A-31 45 434. These are make contacts that short-circuit an electrical circuit when operated mechanically. Furthermore, FR-A-2 447 598 shows various forms of film pushbuttons, in which the partly moved conductor tracks are applied to deformable films, and conveys the principle of an opener in the form of a spiral spring clamped in by a film coated with a conductor track is lifted from its support on this conductor track.

Unterbrechertasten haben die Aufgabe, aus Sicherheitsgründen Stromkreise direkt wirkend zu unterbrechen. Sie müssen sich durch hohe Lebensdauer und Betriebssicherheit auszeichnen und dürfen keine Fehlschaltungen wegen Stössen und Vibrationen hervorrufen. Sie sind fast immer direkt neben schliessenden Drucktasten eingesetzt. Obwohl Drucktasten als Schliesser seit einigen Jahren bei Folientastaturen angewendet werden, gibt es kaum gleichwertige Ausführungen für Oeffner. Die Erfindung hat daher die Aufgabe, einen zu schliessenden Drucktasten gleichwertigen oder besseren Oeffner für Folientastaturen zu schaffen.Breaker buttons have the task of interrupting circuits with a direct effect for safety reasons. They must be characterized by a long service life and operational safety and must not cause incorrect switching due to shocks and vibrations. They are almost always used right next to the closing pushbuttons. Although pushbuttons have been used as closers for several years Membrane keyboards are used, there are hardly any equivalent designs for Openers. The object of the invention is therefore to create a pushbutton that is equivalent or better to be closed for membrane keyboards.

Gemäss der Erfindung wird die Aufgabe gelöst, indem die Schnappscheibe zueinander versetzte Kontaktlappen und Zuglappen aufweist, indem die Zuglappen unter Zugspannung zur Schnappscheibe an der Leiterplatte verankert sind und indem die Kontaktlappen ein elastisches Joch bilden, im unbetätigten Zustand nur auf den Leiterbahnen aufliegen und jeweils zwischen der Kontaktfläche und dem Schnappscheibenteller ein zur Leiterplatte gekrümmtes Abstützknie aufweisen, das sich beim Hinunterpressen der Schnappscheibe auf der Leiterplatte abstützt und die mechanische Widerstandskraft vergrössert, wobei der Bereich zwischen Abstützknie und Scheibenteller elastisch einfedert, das ursprünglich zum Kontakt hin vorgespannte Knie auf der Leiterplatte gleitend eine Schwenkbewegung vollzieht und das Ende des Kontaktlappens mit seiner Kontaktfläche von der Leiterbahn abhebt.According to the invention, the object is achieved in that the snap disk has contact tabs and pull tabs offset from one another, in that the pull tabs are anchored to the snap disk on the printed circuit board under tension and by the contact tabs forming an elastic yoke, in the unactuated state they rest only on the conductor tracks and in each case between the contact surface and the snap disk plate have a support knee curved towards the printed circuit board, which is supported on the printed circuit board when the snap disk is pressed down and increases the mechanical resistance, the area between the support knee and the disk plate springing elastically, the knee originally biased towards contact sliding on the printed circuit board Swiveling movement takes place and the end of the contact tab with its contact surface lifts off the conductor track.

Weitere Vorteile der Erfindung sind darin zu sehen, dass nur durch die unerschiedliche Anordnung der Leiterbahnen und durch die unterschiedlich gestalteten Schnappscheiben die Fertigung von Oeffnern und Schliessern an einer Leiterplatte im Verbund ermöglicht ist und dass dem Benutzer die gleiche taktile Rückmeldung für die Ausführung der Funktion durch Ueberschreiten eines Druckpunktes vermittelt wird.Further advantages of the invention can be seen in the fact that only the different arrangement of the conductor tracks and the differently designed snap disks make it possible to manufacture openers and closers on a printed circuit board in a network and that the user receives the same tactile feedback for the execution of the function Exceeding a pressure point is conveyed.

Im folgenden wird die Erfindung anhand von einem Ausführungsbeispiel beschrieben. Es zeigen:

Fig. 1
einen perspektivischen Ausschnitt aus einer Leiterplatte mit einer als Oeffner ausgebildeten Drucktaste und
Fig. 2
eine graphische Darstellung für die Abhängigkeit der Betätigungskraft und des Kontaktdruckes einer Oeffnerdrucktaste vom Deformationsweg der Schnappscheibe.
The invention is described below using an exemplary embodiment. Show it:
Fig. 1
a perspective section from a Printed circuit board with a push button designed as an opener and
Fig. 2
a graphic representation of the dependence of the actuation force and the contact pressure of an open push button on the deformation path of the snap disk.

In den Figuren ist eine Drucktaste an einer Leiterplatte 1 mit einer elektrisch leitenden Schnappscheibe 4, die in einer Aussparung einer Distanzschicht 2 zwischen einer Abdeckfolie 3 und der mit Leiterbahnen 7 beschichteten Leiterplatte 1 eingebettet ist, gezeigt. Erfindungsgemäss weist die Schnappscheibe 4 zueinander versetzte Kontaktlappen 5 und Zuglappen 6 auf, sind die Zuglappen unter Zugspannung zur Schnappscheibe 4 an der Leiterplatte 1 verankert und bilden die Kontaktlappen ein elastisches Joch. Die Kontaktlappen 5 liegen im unbetätigten Zustand unter Vorspannung auf den Leiterbahnen 7 auf und besitzen zwischen der Kontaktfläche 8 und dem Scheibenteller 10 ein zur Leiterplatte 1 gekrümmtes Abstützknie 9. Beim Hinunterpressen der Schnappscheibe 4 in der Betätigungsrichtung d wächst zunächst in einem Bereich 1 die notwendige Betätigungskraft Fa und die Kontaktkraft Fc, bis das Abstützknie 9 sich auf der Leiterplatte 1 abstützt. Durch die verkürzte Hebelwirkung zwischen Abstützknie 9 und Scheibenteller 10 steigt die notwendige Betätigungskraft in einem Bereich II steiler an, wobei der Bereich zwischen Abstützknie 9 und Scheibenteller 10 elastisch einfedert, das ursprünglich von der Kontaktfläche 8 her vorgespannte Knie auf der Leiterplatte gleitend eine Schwenkbewegung vollzieht und sich die Kontaktkraft Fc bis zum Abheben der Kontaktfläche 8 von der Leiterbahn 7 verringert. Die federnden Elemente sind so dimensioniert und mit der Höhe der Leiterbahn 7 im Bereich der Kontaktfläche 8 abgestimmt, dass die Kontaktflächen 8 spätestens mit dem Erreichen des Scheitelwertes für die Betätigungskraft Fa abheben.The figures show a pushbutton on a printed circuit board 1 with an electrically conductive snap disk 4, which is embedded in a recess in a spacer layer 2 between a cover film 3 and the printed circuit board 1 coated with conductor tracks 7. According to the invention, the snap disk 4 has mutually offset contact tabs 5 and pull tabs 6, the draw tabs are anchored to the snap disk 4 on the printed circuit board 1 under tension and the contact tabs form an elastic yoke. In the unactuated state, the contact tabs 5 are pretensioned on the conductor tracks 7 and, between the contact surface 8 and the disk plate 10, have a support knee 9 curved toward the printed circuit board 1. When the snap disk 4 is pressed down in the actuating direction d, the necessary actuating force initially grows in an area 1 Fa and the contact force Fc until the support knee 9 is supported on the circuit board 1. Due to the shortened leverage between the support knee 9 and the disc plate 10, the necessary actuating force rises more steeply in an area II, the area between the support knee 9 and the disc plate 10 elastically deflecting, the knees originally preloaded from the contact surface 8 slidingly performing a pivoting movement and the contact force Fc decreases until the contact surface 8 lifts off the conductor track 7. The resilient elements are dimensioned and matched to the height of the conductor track 7 in the area of the contact area 8 such that the contact areas 8 at the latest when the peak value for the actuating force Fa is reached.

Im Bereich III sinkt die Betätigungskraft Fa zunächst mit fortschreitender Deformation in Betätigungsrichtung d bis auch der Schnappscheibenteller auf der Leiterplatte aufsitzt und wesentlich grösseren Widerstand entgegensetzt, der die übrigen Schnappscheibenbereiche vor Ueberbeanspruchung schützt. Die Kontaktkraft Fa im unbetätigten Zustand hängt von der Vorspannung der Zuglappen 6 ab, die einerseits die Schnappscheibe zentrieren und andererseits in einer bevorzugten Ausführung durch Ausnehmungen 11 in der Leiterplatte 1 geführt und mit vorstehenden Abbiegungen auf der Rückseite der Leiterplatte 1 verklinkt sind. Weitere Befestigungsmöglichkeiten resp. Widerlager ergeben sich durch Umgiessen, Ankleben oder Anpressen der Zuglappen. Das Spiel zwischen Schnappscheibe 4 und Abdeckfolie 3 wird einmal bei negativem Spiel, d.h. Ueberlappung, zur Erhöhung der Kontaktkraft Fc im unbetätigten Zustand verwendet und dient zum anderen bei positivem Spiel der Zentrierung des Betätigungsfingers. Eine bevorzugte Anwendung für die beschriebenen Unterbrechertasten besteht in Gasbetankungsgeräten für Kraftfahrzeuge.In area III, the actuating force Fa initially decreases with progressive deformation in the actuating direction d until the snap disk plate is also seated on the printed circuit board and opposes substantially greater resistance, which protects the other snap disk areas from excessive stress. The contact force Fa in the unactuated state depends on the pretension of the pull tabs 6, which center the snap disk on the one hand and on the other hand are guided in a preferred embodiment through recesses 11 in the printed circuit board 1 and are latched with protruding bends on the back of the printed circuit board 1. Other mounting options respectively. Abutments result from casting around, gluing or pressing on the pull tabs. The play between the snap disk 4 and the cover sheet 3 is once with negative play, i.e. Overlap, used to increase the contact force Fc in the unactuated state and, on the other hand, serves to center the actuating finger when there is positive play. A preferred application for the breaker buttons described is in gas refueling devices for motor vehicles.

Claims (11)

  1. A key for printed circuit boards (1), the key comprising an electrically conductive snap disc (4) embedded in a recess in a spacer layer (2) disposed between a cover foil (3) and the board (1), the same being coated with printed conductors (7), characterised in that the snap disc (4) has contact tabs (5) and, offset therefrom, tension tabs (6), the tension tabs (6) are fixed to the board (1) with tension relatively to the snap disc (4) and the contact tabs (5) form a resilient yoke, are supported in the inopertaive state only on the printed conductors (7) and have each between the contact surface (8) and the snap disc bulge (10̸) a set (9) which is curved towards the printed board (1), bears thereon when the snap disc (4) is depressed and increases the mechanical force opposing such depression, the zone between the set (9) and the bulge (10̸) deflecting resiliently while the set (9), which was originally biased towards the contact, pivots on the board (1) with a sliding momvement and disengages the contact surface at the end of the contact tab (8) from the printed conductor (7).
  2. A key according to claim 1, characterised in that the tension tabs (6) locate the snap disc on the board (1).
  3. A key according to claims 1 and 2, characterised in that an abutment for the tension tabs (6) is formed by the same extending through a recess (11) in the board (1) end catching on the back thereof by way of projecting bent parts (12).
  4. A key according to claims 1 and 2, characterised in that abutments are formed on the board (1) for tension tabs (6) by potting or sticking or pressing-on.
  5. A key according to any of claims 1 - 4 characterised in that when the activating force (Fa) is applied in the region of the bulge (10̸) at least one contact tab (5) disengages its contact surface (8) from the printed conductor (7).
  6. A key according to any of claims 1 - 5, characterised in that after overshooting a peak value the actuating force (Fa) decreases appreciably until the bulge (10̸) is resting on the board (1) and by virtue of its considerably greater rigidity protects the contact tabs (5) and tension tabs (6) against excessive deformations.
  7. A key according to any of claims 1 - 6, characterised in that at the latest when the actuating force (Fa) reaches its peak value the contact force (Fc) drops to zero and the contact tabs (6) disengage their contact surface (8) from the conductors (7).
  8. A key according to any of claims 1 - 7, characterised in that disengagement of the contact surfaces (8) from the conductors (7) before the peak value is reached can be varied by varying the height of the conductor (7) above the board (1) near the contact surface (8).
  9. A key according to any of claims 1 - 8, characterised in that in the normal state of the cover foil (3) is biased by a projecting snap disc (4) and helps to produce the contact force (Fc).
  10. A key according to any of claims 1 - 8, characterised in that the resilience and distance of the cover foil (3) are so adapted to the height and diameter of the snap disc (4) that a human actuating finger automatically rolls towards the bulge (10̸).
  11. An apparatus for filling the tanks of motor vehicles with gas, characterised in that the apparatus has circuits which are interruptable by means of opener keys according to claims 1 - 10.
EP90810173A 1989-04-10 1990-03-07 Push button on printed circuit board Expired - Lifetime EP0392973B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1344/89A CH677552A5 (en) 1989-04-10 1989-04-10
CH1344/89 1989-04-10

Publications (2)

Publication Number Publication Date
EP0392973A1 EP0392973A1 (en) 1990-10-17
EP0392973B1 true EP0392973B1 (en) 1994-02-23

Family

ID=4208285

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90810173A Expired - Lifetime EP0392973B1 (en) 1989-04-10 1990-03-07 Push button on printed circuit board

Country Status (7)

Country Link
US (1) US4978818A (en)
EP (1) EP0392973B1 (en)
AU (1) AU631858B2 (en)
CA (1) CA2014135A1 (en)
CH (1) CH677552A5 (en)
DE (1) DE59004650D1 (en)
NZ (1) NZ232888A (en)

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DE102008063732A1 (en) * 2008-12-18 2010-06-24 Siemens Aktiengesellschaft Membrane button for use in paging system, has contact surface contacted during actuation of contact disk with conductive strip, where strip is electrically connected with electric circuit for connection with measuring device

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DE19816956C1 (en) * 1998-04-17 1999-10-07 Inovan Stroebe Snap disk switch with increased contact path
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US6423918B1 (en) * 2000-03-21 2002-07-23 Lear Corporation Dome switch
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FR2841037B1 (en) * 2002-06-13 2004-11-26 Itt Mfg Enterprises Inc NORMALLY CLOSED MINIATURIZED ELECTRIC SWITCH WITH TACTILE EFFECT
TW572345U (en) * 2003-06-23 2004-01-11 Emi Stop Corp Elastic sheet of ingle-piece circuit switch
DE102005041029B4 (en) * 2005-08-23 2007-09-06 Prettl, Rolf Belt buckle for seat belts
US7700890B2 (en) * 2008-01-15 2010-04-20 Research In Motion Limited Key dome assembly with improved tactile feedback
FR2937789B1 (en) * 2008-10-28 2010-12-31 Thales Sa KEYBOARD WITH LONG TOUCH STROKE AND IMPROVED TOUCH SENSATION
KR20170022567A (en) * 2015-08-21 2017-03-02 삼성전자주식회사 Contact Structure and Contact device, and electronic Device including the same
JP6689284B2 (en) * 2015-09-30 2020-04-28 アルプスアルパイン株式会社 Push switch

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Publication number Priority date Publication date Assignee Title
DE102008063732A1 (en) * 2008-12-18 2010-06-24 Siemens Aktiengesellschaft Membrane button for use in paging system, has contact surface contacted during actuation of contact disk with conductive strip, where strip is electrically connected with electric circuit for connection with measuring device

Also Published As

Publication number Publication date
AU631858B2 (en) 1992-12-10
AU5299390A (en) 1990-10-11
DE59004650D1 (en) 1994-03-31
CH677552A5 (en) 1991-05-31
US4978818A (en) 1990-12-18
NZ232888A (en) 1993-04-28
CA2014135A1 (en) 1990-10-10
EP0392973A1 (en) 1990-10-17

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