EP0347375B1 - Push button disposition on a circuit board - Google Patents

Push button disposition on a circuit board Download PDF

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Publication number
EP0347375B1
EP0347375B1 EP19890810409 EP89810409A EP0347375B1 EP 0347375 B1 EP0347375 B1 EP 0347375B1 EP 19890810409 EP19890810409 EP 19890810409 EP 89810409 A EP89810409 A EP 89810409A EP 0347375 B1 EP0347375 B1 EP 0347375B1
Authority
EP
European Patent Office
Prior art keywords
snap
circuit board
protective cap
action disc
printed circuit
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.)
Revoked
Application number
EP19890810409
Other languages
German (de)
French (fr)
Other versions
EP0347375A1 (en
Inventor
Dieter Limberger
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.)
Elma Electronic AG
Original Assignee
Elma Electronic 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
Family has litigation
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Application filed by Elma Electronic AG filed Critical Elma Electronic AG
Publication of EP0347375A1 publication Critical patent/EP0347375A1/en
Application granted granted Critical
Publication of EP0347375B1 publication Critical patent/EP0347375B1/en
Anticipated expiration legal-status Critical
Revoked 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
    • H01H13/7006—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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2209/00—Layers
    • H01H2209/01—Increasing rigidity; Anti-creep
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2213/00—Venting
    • H01H2213/002—Venting with external pressure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2219/00—Legends
    • H01H2219/002—Legends replaceable; adaptable
    • H01H2219/014—LED
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2221/00—Actuators
    • H01H2221/064—Limitation of actuating pressure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2221/00—Actuators
    • H01H2221/07—Actuators transparent
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2227/00—Dimensions; Characteristics
    • H01H2227/002—Layer thickness
    • H01H2227/006—Spacer

Definitions

  • the invention relates to a push button arrangement on a printed circuit board.
  • the switch contact is generated via a snap disk, which is embedded in a spacer and is protected against external attack by a cover.
  • a device according to the preamble of claim 1 is known from US Pat. No. 4,365,120.
  • This patent shows pushbuttons on a printed circuit board which have a circular snap disk with a recess in the center for the passage of a light source.
  • the light source protrudes into a protective cap located above the snap disk, which is supported on the snap disk with an annular surface.
  • a disadvantage of this arrangement is that all actuating forces are transmitted to the contact surfaces, including those that are much too large.
  • the protective cap will tilt on one side if an eccentric attack force occurs on the periphery, as is the case when operating with pointed writing tools.
  • U.S. Pat. 4,056,701 pushbuttons equipped with light-emitting diodes are shown, which are designed in a sophisticated and intended for large series. With this arrangement, a uniform keypad in flat design is achieved, the keys of which are illuminated when actuated or by feeding from the outside.
  • a disadvantage of this construction is that it has four carrier bodies (58, 46, 22, 12), which requires precise processing and coverage of the processed fields. Small series with individual keypads can no longer be produced economically using this technology.
  • the buttons, the lighting of which is not necessary, do not have to be actuated on their associated light-emitting diodes, but nevertheless have to be carried out in this complex design.
  • the patent specification FR 2 280 291 shows pushbuttons on a printed circuit board with spiral springs which are pressed onto a contact via key heads. Every push of a button, no matter how big, is transferred to the contact.
  • the spiral springs project in their longitudinal direction considerably beyond the width of the keys, which limits the spacing of the keys, and they are used to operate the key body when actuated with a central bore. Eccentric actuation forces can generate longitudinal displacement forces on the spiral spring.
  • the object of the invention is to provide externally protected pushbuttons with few individual elements in a flat design on a printed circuit board.
  • the advantage of the invention is that the operator-related loads on the cover foils and the snap disks are limited in such a way that no overloading and destruction occur.
  • a pushbutton arrangement is shown on a printed circuit board, which in its basic structure consists of a printed circuit board 1 with printed conductors 6 and a snap disk 5, which rests on the one hand on the printed conductors 6 and on the printed circuit board 1 and on the other hand in its movement from an overlapping one Protective cap 4 is limited, which is held by a cover sheet 3 in an opening 12 of the spacer 2.
  • the electrically insulating spacer 2 provided with openings 12 is firmly connected to the printed circuit board 1 via a binder and to the cover film 3 on the opposite side.
  • the deformation of the cover film 3 and the snap disk 5 is limited by the freedom of movement of the protective cap 4 located in the opening 12 of the spacer 2.
  • the protective cap 4 has an outer edge 13 projecting toward the printed circuit board 1, so that the snap disk 5 is enclosed between the protective cap 4 and the printed circuit board 1 when the pressure mask arrangement is actuated, and a path limitation is created.
  • the protective cap 4 only engages on a single, dome-shaped engagement surface in the middle of the snap disk 5.
  • the position of the snap disk 5 is secured by two projecting tabs 11, each of which engages in a recess 10 of the circuit board 1.
  • a light source 9 can be attached under the printed circuit board 1, which illuminates the latter through an opening 7 in the printed circuit board 1 and through an opening 8 in the snap disk 5 when the protective cap 4 and cover film 3 are made transparent.
  • the thickness of the spacer 2 is made greater than 1 mm.

Landscapes

  • Push-Button Switches (AREA)
  • Switch Cases, Indication, And Locking (AREA)

Description

Die Erfindung bezieht sich auf eine Drucktastenanordnung auf einer Leiterplatte. Bei solchen Anwendungen, wie sie beispielsweise im Schalttafelbau verwendet werden, wird der Schaltkontakt über eine Schnappscheibe erzeugt, die in einem Distanzstück eingebettet ist und durch eine Abdeckung gegen äusseren Angriff geschützt wird.The invention relates to a push button arrangement on a printed circuit board. In such applications, such as those used in control panel construction, the switch contact is generated via a snap disk, which is embedded in a spacer and is protected against external attack by a cover.

Mehrere dieser Drucktastenanordnungen sind im allgemeinen zu Tastenfeldern auf Leiterplatten zusammengefasst.Several of these push button arrangements are generally combined into key fields on printed circuit boards.

Eine Vorrichtung gemäß dem Oberbegriff des Anspruchs 1 ist aus der Patentschrift U.S. 4,365,120 bekannt. Diese Patentschrift zeigt Drucktasten auf einer Leiterplatte, die eine kreisrunde Schnappscheibe mit einer Ausnehmung im Zentrum für das Durchführen einer Lichtquelle aufweisen. Die Lichtquelle ragt bis in eine über der Schnappscheibe liegende Schutzkappe hinein, welche sich mit einer Ringfläche auf der Schnappscheibe abstützt. Ein Nachteil dieser Anordnung besteht darin, dass alle Betätigungskräfte auf die Kontaktflächen übertragen werden also auch solche, die viel zu gross sind. Im weiteren besteht die Gefahr, dass die Schutzkappe einseitig verkantet, wenn an der Peripherie eine exzentrische Angriffskraft wie bei der Unsitte der Betätigung mit spitzen Schreibwerkzeugen auftritt. Im weiteren wird eine Leiterbahn von der Rückseite der Leiterplatte unter die Schnappscheibe auf der Vorderseite geführt, was zwangsläufig eine Handlötstelle auf der Vorderseite oder bei einer unteren Kontaktscheibe (17), mit zur Rückseite durchsteckbaren Lötfahnen, Leiter auf der Rückseite der Leiterplatte voraussetzt.A device according to the preamble of claim 1 is known from US Pat. No. 4,365,120. This patent shows pushbuttons on a printed circuit board which have a circular snap disk with a recess in the center for the passage of a light source. The light source protrudes into a protective cap located above the snap disk, which is supported on the snap disk with an annular surface. A disadvantage of this arrangement is that all actuating forces are transmitted to the contact surfaces, including those that are much too large. Furthermore, there is a risk that the protective cap will tilt on one side if an eccentric attack force occurs on the periphery, as is the case when operating with pointed writing tools. In the further one Conductor run from the back of the circuit board under the snap disk on the front, which inevitably requires a hand soldering point on the front or with a lower contact disk (17), with solder tabs that can be pushed through to the back, conductor on the back of the circuit board.

In der Patentschrift U.S. 4,056,701 sind mit Leuchtdioden bestückte Drucktasten gezeigt, die in einer ausgeklügelten und für Gross-Serien vorgesehenen Bauweise ausgeführt sind. Mit dieser Anordnung wird ein einheitliches Tastenfeld in Flachbauweise erreicht, dessen Tasten bei Betätigung oder durch Anspeisen von aussen erleuchtet sind. Ein Nachteil dieser Konstruktion ist, dass sie vier Trägerkörper (58, 46, 22, 12) aufweist, die eine exakte Bearbeitung und Ueberdeckung der bearbeiteten Felder voraussetzt. Klein-Serien mit individuellen Tastenfeldern sind in dieser Technik nicht mehr wirtschaftlich herzustellen. Die Tasten, deren Beleuchtung nicht notwendig ist, müssen zwar an ihren zugehörigen Leuchtdioden nicht angesteuert werden, aber trotzdem in dieser komplexen Bauform ausgeführt werden.U.S. Pat. 4,056,701 pushbuttons equipped with light-emitting diodes are shown, which are designed in a sophisticated and intended for large series. With this arrangement, a uniform keypad in flat design is achieved, the keys of which are illuminated when actuated or by feeding from the outside. A disadvantage of this construction is that it has four carrier bodies (58, 46, 22, 12), which requires precise processing and coverage of the processed fields. Small series with individual keypads can no longer be produced economically using this technology. The buttons, the lighting of which is not necessary, do not have to be actuated on their associated light-emitting diodes, but nevertheless have to be carried out in this complex design.

Die Patentschrift FR 2 280 291 zeigt Drucktasten auf einer Leiterplatte mit Biegefedern, die über Tastenköpfe auf einen Kontakt gedrückt werden. Jeder noch so grosser Tastendruck wird auf den Kontakt übertragen. Die Biegefedern stehen in ihrer Längsrichtung erheblich über die Breite der Tasten vor, was den Abstand der Tasten beschränkt, und sie werden beim Betätigen mit einer zentralen Bohrung zur Führung des Tastenkörpers benutzt. Exzentrische Betätigungskräfte können an der Biegefeder in Längsrichtung Verschiebekräfte erzeugen.The patent specification FR 2 280 291 shows pushbuttons on a printed circuit board with spiral springs which are pressed onto a contact via key heads. Every push of a button, no matter how big, is transferred to the contact. The spiral springs project in their longitudinal direction considerably beyond the width of the keys, which limits the spacing of the keys, and they are used to operate the key body when actuated with a central bore. Eccentric actuation forces can generate longitudinal displacement forces on the spiral spring.

Aufgabe der Erfindung ist es, nach aussen hin geschützte Drucktasten mit wenig Einzelelementen in Flachbauweise auf einer Leiterplatte anzubringen.The object of the invention is to provide externally protected pushbuttons with few individual elements in a flat design on a printed circuit board.

Diese Aufgabe wird mit den Kennzeichen von Anspruch 1 gelöst.This object is achieved with the characteristics of claim 1.

Der Vorteil der Erfindung besteht darin, dass die bedienungsbedingten Belastungen der Abdeckfolien und der Schnappscheiben derart in Grenzen gehalten werden, dass keine Ueberbelastungen und Zerstörungen auftreten.The advantage of the invention is that the operator-related loads on the cover foils and the snap disks are limited in such a way that no overloading and destruction occur.

Die Unteransprüche 2 bis 4 stellen vorteilhafte Weiterbildungen der Erfindungen dar.The sub-claims 2 to 4 represent advantageous developments of the inventions.

Im folgenden wird die Erfindung anhand von einem Ausführungsbeispiel beschrieben.

Fig. 1
ist schematisch ein Schnitt in perspektivischer Darstellung durch eine erfindungsgemässe Drucktastenanordnung auf einer Leiterplatte und
Fig. 2
ist in verkleinertem Massstab eine Draufsicht ohne Abdeckfolie und ohne Schutzkappe.
The invention is described below using an exemplary embodiment.
Fig. 1
is a schematic sectional view in perspective through a push button arrangement according to the invention on a circuit board and
Fig. 2
is a plan view on a reduced scale without cover film and without protective cap.

In den Figuren ist eine Drucktastenanordnung auf einer Leiterplatte dargestellt, welche in ihrem grundsätzlichen Aufbau aus einer Leiterplatte 1 mit Leiterbahnen 6 und einer Schnappscheibe 5 besteht, die einerseits auf den Leiterbahnen 6 und auf der Leiterplatte 1 aufliegt und die andererseits in ihrer Bewegung von einer überdeckenden Schutzkappe 4 begrenzt ist, welche durch eine Abdeckfolie 3 in einem Durchbruch 12 des Distanzstückes 2 gehalten wird.In the figures, a pushbutton arrangement is shown on a printed circuit board, which in its basic structure consists of a printed circuit board 1 with printed conductors 6 and a snap disk 5, which rests on the one hand on the printed conductors 6 and on the printed circuit board 1 and on the other hand in its movement from an overlapping one Protective cap 4 is limited, which is held by a cover sheet 3 in an opening 12 of the spacer 2.

Das mit Durchbrüchen 12 versehene elektrisch isolierende Distanzstück 2 ist über einen Binder fest mit der Leiterplatte 1 und auf der Gegenseite mit der Abdeckfolie 3 verbunden. Die Deformation der Abdeckfolie 3 und der Schnappscheibe 5 ist durch den Bewegungsspielraum der im Durchbruch 12 des Distanzstückes 2 liegenden Schutzkappe 4 begrenzt. Die Schutzkappe 4 weist einen zur Leiterplatte 1 vorstehenden Aussenrand 13 auf, so, dass die Schnappscheibe 5 bei Betätigung der Drucktaskenanordnung zwischen Schutzkappe 4 und Leiterplatte 1 eingeschlossen ist und eine Wegbegrenzung entsteht. Die Schutzkappe 4 greift nur an einer einzigen, kalottenförmigen Angriffsfläche in der Mitte der Schnappscheibe 5 an.The electrically insulating spacer 2 provided with openings 12 is firmly connected to the printed circuit board 1 via a binder and to the cover film 3 on the opposite side. The deformation of the cover film 3 and the snap disk 5 is limited by the freedom of movement of the protective cap 4 located in the opening 12 of the spacer 2. The protective cap 4 has an outer edge 13 projecting toward the printed circuit board 1, so that the snap disk 5 is enclosed between the protective cap 4 and the printed circuit board 1 when the pressure mask arrangement is actuated, and a path limitation is created. The protective cap 4 only engages on a single, dome-shaped engagement surface in the middle of the snap disk 5.

Die Lage der Schnappscheibe 5 wird durch zwei vorstehende Lappen 11 gesichert, von denen jeder in eine Ausnehmung 10 der Leiterplatte 1 eingreift. Unter der Leiterplatte 1 kann eine Lichtquelle 9 angebracht werden, die durch einen Durchbruch 7 der Leiterplatte 1 und durch einen Durchbruch 8 der Schnappscheibe 5 bei transparent ausgeführter Schutzkappe 4 und Abdeckfolie 3 letztere erleuchtet.The position of the snap disk 5 is secured by two projecting tabs 11, each of which engages in a recess 10 of the circuit board 1. A light source 9 can be attached under the printed circuit board 1, which illuminates the latter through an opening 7 in the printed circuit board 1 and through an opening 8 in the snap disk 5 when the protective cap 4 and cover film 3 are made transparent.

Trotz der Forderung nach möglichst flacher Bauweise wird die Dicke des Distanzstückes 2 grösser als 1 mm ausgeführt.Despite the requirement for the flatest possible construction, the thickness of the spacer 2 is made greater than 1 mm.

Claims (4)

  1. A pushbutton arrangement on a printed circuit board (1),
       consisting of a springy snap-action disc (5) which is arranged in an opening (12) in an electrically insulating distancepiece (2) and covered over in this opening (12) by a protective cap (4), the distancepiece (2) and the protective cap (4) being coated externally with a covering foil (3), characterized in that all of the conductors (6) for making contact in the region of the snap-action disc (5) are arranged on one side of the printed circuit board (1) next the snap-action disc (5), that the protective cap (4) exhibits an outer edge (13) which projects towards the snap-action disc (5) so that upon actuation of the arrangement the snap-action disc (5) is enclosed between the protective cap (4) and the printed circuit board (1) and without touching the snap-action disc (5) the outer edge (13) forms a limit to the travel of the snap-action disc (5) under compression, and that the protective cap (4) exhibits one single centrally-arranged hemispherical area of engagement with the snap-action disc.
  2. A pushbutton arrangement as in Claim 1,
       characterized in that the snap-action disc (5) is provided with at least two projecting tabs (11) each of which engages in a recess (10) in the printed circuit board (1).
  3. A pushbutton arrangement as in Claim 1 or 2,
       characterized in that the protective cap (4) and the covering foil (3) are transparent and that underneath the protective cap (4) the snap-action disc (5) and the printed circuit board (1) exhibit openings (7, 8) lying one above the other for light to pass through.
  4. A pushbutton arrangement as in one of the Claims 1 to 3,
       characterized in that the distancepiece (2) is made of a thickness greater than 1 mm in order to insert the protective cap (4).
EP19890810409 1988-06-14 1989-06-01 Push button disposition on a circuit board Revoked EP0347375B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2271/88 1988-06-14
CH227188A CH676765A5 (en) 1988-06-14 1988-06-14

Publications (2)

Publication Number Publication Date
EP0347375A1 EP0347375A1 (en) 1989-12-20
EP0347375B1 true EP0347375B1 (en) 1993-09-15

Family

ID=4229866

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890810409 Revoked EP0347375B1 (en) 1988-06-14 1989-06-01 Push button disposition on a circuit board

Country Status (3)

Country Link
EP (1) EP0347375B1 (en)
CH (1) CH676765A5 (en)
DE (1) DE58905591D1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4139554A1 (en) * 1991-10-14 1993-04-15 Fela Mikrotechnik Ag ELECTRIC KEY SWITCH
DE4213084A1 (en) * 1992-04-21 1993-01-07 Bock Hans A Dipl Ing Tu Key switch for mounting in vehicle steering wheel, console, or armrest - is operated by plastics elastic skin of upper surface, being formed as SMD, with conductor plate on solder side of cable distributor
DE19823894C1 (en) * 1998-04-18 2000-01-05 Inovan Stroebe Snap disc switch with fastener
DE19847614A1 (en) * 1998-10-15 2000-05-04 Magenwirth Gmbh Co Gustav Snap switch
US6423918B1 (en) * 2000-03-21 2002-07-23 Lear Corporation Dome switch
DE10315202A1 (en) * 2003-04-03 2004-10-14 Leopold Kostal Gmbh & Co. Kg Remote control for operating a locking device of a motor vehicle

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1472355A (en) * 1974-07-24 1977-05-04 Amp Inc Switches for electrical assemblies
US4056701A (en) * 1976-07-08 1977-11-01 Bowmar Instrument Corporation Low profile lighted push button switch
CH632112A5 (en) * 1978-07-07 1982-09-15 Sodeco Compteurs De Geneve Push-button keypad and use of the same as a dialling keypad of a public telephone station
DE2902769C2 (en) * 1979-01-25 1982-12-09 Rudolf Schadow Gmbh, 1000 Berlin Push button switch
US4365120A (en) * 1981-04-13 1982-12-21 Kb Denver, Inc. Illuminated keyboard
DE3145434A1 (en) * 1981-11-16 1983-05-26 Kundisch GmbH, 7730 Villingen-Schwenningen Film keyboard with a pressure point

Also Published As

Publication number Publication date
DE58905591D1 (en) 1993-10-21
CH676765A5 (en) 1991-02-28
EP0347375A1 (en) 1989-12-20

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