EP0538199A2 - Interrupteur à bouton poussoir - Google Patents

Interrupteur à bouton poussoir Download PDF

Info

Publication number
EP0538199A2
EP0538199A2 EP92810783A EP92810783A EP0538199A2 EP 0538199 A2 EP0538199 A2 EP 0538199A2 EP 92810783 A EP92810783 A EP 92810783A EP 92810783 A EP92810783 A EP 92810783A EP 0538199 A2 EP0538199 A2 EP 0538199A2
Authority
EP
European Patent Office
Prior art keywords
centering cap
circuit board
snap
push
pushbutton
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
EP92810783A
Other languages
German (de)
English (en)
Other versions
EP0538199A3 (en
EP0538199B1 (fr
Inventor
Ernst Ingold
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.)
FELA MANAGEMENT AG
Original Assignee
FELA MIKROTECHNIK 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 FELA MIKROTECHNIK AG filed Critical FELA MIKROTECHNIK AG
Publication of EP0538199A2 publication Critical patent/EP0538199A2/fr
Publication of EP0538199A3 publication Critical patent/EP0538199A3/de
Application granted granted Critical
Publication of EP0538199B1 publication Critical patent/EP0538199B1/fr
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
    • H01H13/7006—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
    • 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
    • H01H13/023—Light-emitting indicators
    • 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
    • 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
    • H01H2221/00—Actuators
    • H01H2221/064—Limitation of actuating pressure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2227/00—Dimensions; Characteristics
    • H01H2227/026—Separate dome contact

Definitions

  • the present invention relates to an electrical pushbutton switch which is arranged on a printed circuit board, with electrically conductive lead fields and contact fields attached to the printed circuit board, with an electrically conductive snap disk resting on the lead fields of the printed circuit board, which, when actuated, between the lead fields on the printed circuit board and makes or breaks the contact fields on the printed circuit board.
  • Such push buttons are known for example from DE-OS 24 52 944.
  • Snap disks are used as switching elements in these pushbutton switches. The purpose of the snap disks is to make contact quickly and to have them tear off again quickly. This is necessary so that no arcing occurs between the switched contact surfaces when switching between switched and unswitched states. An arc between the contact surfaces would wear out the contacts relatively quickly.
  • Snap disks are domed disks that snap into a different position when they are actuated beyond a certain actuation point.
  • the course of the actuation force compared to the actuation path forms a mechanical hysteresis loop with a maximum resistance. In practice, this means that the disk moves quickly on its deformation path after the snap point, regardless of the operation. This is also the behavior desired for quick contact establishment.
  • the disc is released, the same process takes place in reverse. If the holding force decreases, the snap disc jumps back to its original shape from a certain point, regardless of whether it was released slowly or quickly.
  • the maximum resistance in the course of the actuating force also has the advantage that the probability of an undesirable fluttering movement of the switching element is reduced to a minimum.
  • snap disks are used as switching elements, e.g. in DE-OS 24 52 944, they are therefore designed so that they can be pushed through without damage until the contact is made. Any further movement is then limited by the contact itself. However, if the operator is not initiated at the intended initiation point and at the same time with increased force, the snap disk can still be overpressed despite the measure described and thereby lose its resilience.
  • the invention is therefore based on the object of creating a compact and flat, insensitive, universally usable and easy to manufacture pushbutton switch of the type mentioned, which can be operated as desired, without the clamping force of the snap disk suffering as a result.
  • the electrical supply lines and necessary contact surfaces should also be able to be configured on a conventional printed circuit board.
  • This circuit board should be able to be assembled and soldered in a conventional manner.
  • a snap and centering cap rests on the snap disk, which is held between the snap disk and a resilient cover film sealingly covering a front plate and the tactile and centering cap, the touch and centering cap being two mutually objectionable areas spans an actuation area with which the probe and centering cap rests on the snap disc at its actuation point, and a support region with which the probe and centering cap is supported when pressed down towards the circuit board.
  • the interaction of these measures results in a compact, flat, insensitive and easy to manufacture push button switch that can be operated as desired.
  • the actuating force acts on the switch from the intended depression point, it is always divided into two parts by the feeler and centering cap.
  • One part, no matter where and how the force has been introduced, is controlled by the actuation area of the push-button and centering cap and is deliberately delivered to the snap disk at the actuation point of the snap disk to actuate it.
  • the other part of the actuating force is introduced into the circuit board from the support area without loading the snap disk. Loads on the snap disk that are not provided for are reliably avoided as a result, the snap disk can no longer be overpressed.
  • the feeler and centering cap can protrude laterally from the snap disk and enable a pleasantly large, also polygonal keypad.
  • the subject of the invention according to claim 1 allows a solderless and dimensionally assembled construction to be realized, which ensures reliable contacting and a long service life.
  • the circuit board to be used does not have to be matched to the design of the key switch; for example, it can be a common multilayer.
  • the circuit board can be assembled and soldered in any technology and then assembled.
  • the front panel to be used may also be made of any material and also does not require any special adaptation.
  • the pushbutton switch In its combination of front and printed circuit board, the pushbutton switch is extremely stable and easy to maintain. Depending on requirements, both the front plate and the printed circuit board can be replaced individually or together - for example during a revision or an "up grade".
  • the probe and centering cap is provided with a slightly curved top, and the cover film is prestressed in the area of the top of the probe and centering cap.
  • the snap disk is fastened positively or positively within the push-button and centering cap to facilitate assembly and disassembly, at least one positioning pin being slidably engaging in a bore of the printed circuit board being arranged on the push-button and centering cap.
  • each positioning pin of the push-button and centering cap has an undercut on which the snap disk is in the unactuated state of the push-button switch while at the same time resting against the push-button on the push-button. and centering cap supports.
  • Snap disks that have at least approximately rectilinear side edges have proven successful. Together with the positioning pins, these prevent the washer from being twisted inadmissibly.
  • a force transmission ring which rests on the snap disk in the idle state, has proven particularly useful for actuating the snap disk; When the pushbutton switch is actuated, it transmits the force to the snap disk without unnecessarily stressing it mechanically. In addition, the force transmission ring helps to center the snap disk so that none Tilting and / or disruptive wear on the positioning pins can occur.
  • a push button switch allows numerous design variants for its illumination.
  • LEDs light-emitting diodes
  • the modular design of the pushbutton switch allows easy maintenance or individual replacement of lighting elements.
  • a rotationally symmetrical pushbutton switch is designated 1 and lies directly on a flat circuit board 2.
  • the push button switch 1 there is an electrically conductive snap disk 3, which rests on the surface of the printed circuit board 2 with three contact feet 3a shaped as indentations.
  • the snap disc 3 is made of thin sheet metal by stamping and stamping and is provided with a thin coating of gold for better contact.
  • the snap disk 3 has an embossed contact nipple 3b with a contact denoted by 5.
  • Circular contact surfaces 6 are arranged on the printed circuit board 2 below the contact feet 3a and the contact lug 3b.
  • a known front plate 7 with a punched-out portion 8 is located on the circuit board, into which the snap disk 3 is inserted.
  • a probe and centering cap 11 On the snap disk 3 is a probe and centering cap 11 with its force transmission ring 11a; she has one top 22 slightly curved outwards, cf. Fig. 3.
  • the feeler and centering cap 11 is held between the snap disc 3 and a correspondingly biased cover sheet 12. This covers both the front plate 7 and the, for example, multiple additional push-button and centering caps 11, which are present several times, dust and water-tight over the entire surface.
  • Known elastic decorative films have proven themselves as cover film 12. The prerequisite for this is that they are dimensioned in such a way that they allow a certain deflection in the area of the punching 8, in the front plate 7, which is sufficient to actuate the push button switch 1.
  • the height of the curvature of the upper side 22 of the feeler and centering cap 11 is based on the size of the spring travel of the snap disk 3, in order to achieve a clear switching sensation, it being particularly favorable if the height of the curvature corresponds to less than half the spring travel.
  • the force introduction ring 11a on the underside of the one-piece feeler and centering cap 11 lies concentrically on the snap disk 3 and switches it optimally. It also spans two existing areas with different functions.
  • the area of the snap disk 3 located above the contact point 5, with its central contact projection 3b, is designated in FIG. 1 as the actuating area 13.
  • the edge region of the push-button and centering cap 11, which projects laterally beyond the snap disk 3 and with which the push-button and centering cap 11 can be supported when depressed towards the printed circuit board 2 without loading the snap disk 3, is called the support area 14.
  • the actuation area 13, formed by the force introduction ring 11 a, ensures an optimal force distribution on the surface of the snap disk 3 and thus ensures a long service life of the pushbutton switch 1.
  • the actuation area 13 and the support area 14 are spanned by the bottom 17 of the probe and centering cap 11.
  • the bottom 17 distributes the initiated actuation forces proportionally into the support region 14 and the actuation region 13.
  • the snap disk 3 is therefore only acted upon by the corresponding, limited force component which is applied to the actuation region 13 of the push-button and centering cap 11 and which there, as provided , at the contact point 5 of the snap disk 3 takes effect.
  • a preferably spherical snap disk 3 is used, cf. FIGS. 2 and 8.
  • Three positioning pins 23 with bevels 16, which are offset by 120 ° from one another, are formed on the feeler and centering cap 11 in a support region 14.
  • the pins 23 have an undercut 24 lying in the unactuated state of the pushbutton switch 1 in the plane of the upper side of the printed circuit board 2, and dip into an associated bore 25 in the printed circuit board.
  • the arched contact feet 3a of the snap disk 3 lie on the one hand on the undercuts 24 of the positioning pins 23 and, on the other hand, on the top of the printed circuit board 2 when the pushbutton switch 1 is not actuated.
  • FIG. 2 shows, with the cover film 12 removed, details of the feeler and centering cap 11.
  • the configuration of the undercuts 24 with their supports 11b for the snap disk 3 can be seen.
  • the force introduction ring 11a was not shown here.
  • the key switch 1, Fig. 3, is constructed in a manner analogous to that described above.
  • the snap disk 3 here has a circular, wavy shape and is switched by a central push button 15 in the sensing and centering cap 11.
  • a light source 18 is arranged at the lower end of the bore 25, which serves to illuminate the probe cap, which is transparent here.
  • FIG. 4 to 8 show differently shaped snap disks 3 which can in principle be used with pushbutton switches of the type shown in FIG. 1, the snap disks 3 being associated with pushbutton and centering caps (not shown) with loosely fitting positioning pins 23 in number.
  • three positioning pins 23 belong to the snap disk according to FIG. 4, two positioning pins to the snap disk according to FIG. 5, one positioning pin to the snap disk according to FIG. 6, four positioning pins to the snap disk according to FIG. 7 and to the snap disk according to FIG. 8 three positioning pins 23.
  • FIG. 6 shows tendon-like edges 3 ⁇ and corresponds to that from FIGS. 1 and 2.
  • the snap disk 3 is fixed within the feeler and centering cap 11 and the positioning pins 23 take over the positioning of the feeler and centering cap 11 on the printed circuit board 2.
  • the alternative button switch 1 shown in FIG. 9 works with a cross-shaped snap disk 3, in which two opposite contact feet 4 are each provided with a guide web 26 bent in the direction of the printed circuit board 2.
  • the guide webs 26 also dip into associated bores 27 in the printed circuit board 2.
  • the area of the bends of the guide webs 24 snaps into a groove of a shoulder 28 attached to the feeler and centering cap 11, as a result of which the snap disk 3 is positioned.
  • the lugs 28 engage in corresponding recesses 29 in the bores 27.
  • the positioning of the feeler and centering cap 11 consequently takes place through the guide webs 26 of the snap disk 3.
  • Fig. 10 shows schematically a part of a front panel 7, in which a plurality of pushbuttons are arranged side by side in cutouts 8.
  • the front plate 7 is designed here as a light guide; this is assigned a light source 18.
  • Light supply webs 19 lead from this light source 18 to the switch arrangement. These webs 19 are designed in one piece with the front plate 7, as a result of which light is guided to the switch arrangement in a manner known per se.
  • FIG. 11 serves to illustrate very expedient lighting variants of the transparent push-button and centering cap 11.
  • Notoriously known light-emitting diodes 30 placed on the circuit board are inserted into an illumination groove 11c on the left-hand side.
  • a bore 31 is provided on the right in the same drawing, in which an inserted or glued or cast LED 32 with flexible connections 33 and 34 is shown.
  • the front plate and the printed circuit board can be screwed together and / or joined together in any desired manner.
  • the subject matter of the invention can be completely adapted to the operating conditions with regard to the installation and / or the maintenance instructions, since it is modular and solderless.

Landscapes

  • Push-Button Switches (AREA)
  • Switches With Compound Operations (AREA)
EP92810783A 1991-10-14 1992-10-13 Interrupteur à bouton poussoir Expired - Lifetime EP0538199B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE4133949 1991-10-14
DE4133949 1991-10-14
DE4139554A DE4139554A1 (de) 1991-10-14 1991-11-30 Elektrischer tastschalter
DE4139554 1991-11-30

Publications (3)

Publication Number Publication Date
EP0538199A2 true EP0538199A2 (fr) 1993-04-21
EP0538199A3 EP0538199A3 (en) 1993-06-30
EP0538199B1 EP0538199B1 (fr) 1997-09-03

Family

ID=25908196

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92810783A Expired - Lifetime EP0538199B1 (fr) 1991-10-14 1992-10-13 Interrupteur à bouton poussoir

Country Status (3)

Country Link
EP (1) EP0538199B1 (fr)
AT (1) ATE157808T1 (fr)
DE (2) DE4139554A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2294158A (en) * 1994-10-14 1996-04-17 Peter Stefan Jones Switch assembly
EP0764958A2 (fr) * 1995-09-21 1997-03-26 Fuji Polymertech Co., Ltd Ressort à disque en forme de dÔme
WO2002037516A2 (fr) * 2000-11-06 2002-05-10 Dyna Systems Gmbh Interrupteur electrique, notamment interrupteur piezo-electrique, avec accuse reception optique et/ou mecanique du processus de commutation
WO2009050061A1 (fr) * 2007-10-16 2009-04-23 BSH Bosch und Siemens Hausgeräte GmbH Dispositif de commande d'équipement ménager
CN102403151A (zh) * 2010-09-15 2012-04-04 霍弗·霍斯贝克及弗斯特两合公司 开关
EP2515315A1 (fr) * 2011-04-22 2012-10-24 Alps Electric Co., Ltd. Élément de contact mobile et dispositif de commutation utilisant un élément de contact mobile
EP2996129A1 (fr) 2014-09-11 2016-03-16 Wincor Nixdorf International GmbH Dispositif pour détecter la manipulation d'un objet

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29514655U1 (de) * 1995-09-12 1995-11-02 Schurter GmbH, 79346 Endingen Elektrische Tastatur
DE19605201B4 (de) * 1996-02-13 2007-04-12 Marquardt Gmbh Gehäuse für einen elektronischen Schlüssel
FR2762454B1 (fr) * 1997-04-17 1999-06-04 Afe Plasturgie Touche plate pour tableau de commande de chauffage de vehicule
DE19817369A1 (de) 1997-05-07 1998-11-12 Marquardt Gmbh Anordnung von Schaltern
DE19817239B4 (de) * 1998-04-18 2011-12-29 Grothe Gmbh Elektrischer Taster
DE19847614A1 (de) * 1998-10-15 2000-05-04 Magenwirth Gmbh Co Gustav Sprungschalter
DE10011800B4 (de) * 2000-03-14 2007-11-29 Robert Bosch Gmbh Beleuchtungsvorrichtung
DE102004004136B4 (de) * 2004-01-28 2006-04-20 Braun Gmbh Elektrisches Kleingerät mit einer Schalteinrichtung
DE102009004975B3 (de) * 2009-01-14 2009-12-24 Sick Ag Gerät mit wenigstens einem Bedienelement
DE102009036209B4 (de) * 2009-08-05 2012-01-26 Trw Automotive Electronics & Components Gmbh Beleuchtbare Tastschaltergruppe und deren Verwendung als beleuchtbares Bedienfeld in Kraftfahrzeugen
DE102019103268A1 (de) * 2019-02-11 2020-08-13 HAT-tec GmbH Druckschaltervorrichtung

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2902357A1 (de) * 1979-01-22 1980-07-31 Licentia Gmbh Mehrere tastschalter aufweisendes tastenfeld
US4365120A (en) * 1981-04-13 1982-12-21 Kb Denver, Inc. Illuminated keyboard
DE3728166A1 (de) * 1987-08-24 1989-03-30 Ernst Neubert Leiterplatten-tastschalter
EP0347375A1 (fr) * 1988-06-14 1989-12-20 Elma Electronic Ag Disposition de boutons-poussoir sur une plaque à circuit
US4892988A (en) * 1987-04-10 1990-01-09 Ishii Hyoki Co., Ltd. Membrane panel switch
CH674279A5 (en) * 1987-09-04 1990-05-15 Alex Christen Solder-free snap key switch with helical spring - has doubly-sprung head secured to contact carrier by lateral projections from feet pressed into holes

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2902357A1 (de) * 1979-01-22 1980-07-31 Licentia Gmbh Mehrere tastschalter aufweisendes tastenfeld
US4365120A (en) * 1981-04-13 1982-12-21 Kb Denver, Inc. Illuminated keyboard
US4892988A (en) * 1987-04-10 1990-01-09 Ishii Hyoki Co., Ltd. Membrane panel switch
DE3728166A1 (de) * 1987-08-24 1989-03-30 Ernst Neubert Leiterplatten-tastschalter
CH674279A5 (en) * 1987-09-04 1990-05-15 Alex Christen Solder-free snap key switch with helical spring - has doubly-sprung head secured to contact carrier by lateral projections from feet pressed into holes
EP0347375A1 (fr) * 1988-06-14 1989-12-20 Elma Electronic Ag Disposition de boutons-poussoir sur une plaque à circuit

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2294158A (en) * 1994-10-14 1996-04-17 Peter Stefan Jones Switch assembly
EP0764958A2 (fr) * 1995-09-21 1997-03-26 Fuji Polymertech Co., Ltd Ressort à disque en forme de dÔme
EP0764958A3 (fr) * 1995-09-21 1998-05-13 Fuji Polymertech Co., Ltd Ressort à disque en forme de dÔme
WO2002037516A2 (fr) * 2000-11-06 2002-05-10 Dyna Systems Gmbh Interrupteur electrique, notamment interrupteur piezo-electrique, avec accuse reception optique et/ou mecanique du processus de commutation
WO2002037516A3 (fr) * 2000-11-06 2003-02-13 Dyna Systems Gmbh Interrupteur electrique, notamment interrupteur piezo-electrique, avec accuse reception optique et/ou mecanique du processus de commutation
US7250708B2 (en) 2000-11-06 2007-07-31 Dyna Systems Gmbh Electric switch, especially a piezo switch, with optical and/or mechanical feedback of the switching operation
WO2009050061A1 (fr) * 2007-10-16 2009-04-23 BSH Bosch und Siemens Hausgeräte GmbH Dispositif de commande d'équipement ménager
CN102403151A (zh) * 2010-09-15 2012-04-04 霍弗·霍斯贝克及弗斯特两合公司 开关
EP2431990A3 (fr) * 2010-09-15 2013-03-27 Huf Hülsbeck & Fürst GmbH & Co. KG Interrupteur
US8598478B2 (en) 2010-09-15 2013-12-03 Huf Hülsbeck & Fürst Gmbh & Co. Kg Switch
CN102403151B (zh) * 2010-09-15 2016-08-10 霍弗·霍斯贝克及弗斯特两合公司 开关
EP2515315A1 (fr) * 2011-04-22 2012-10-24 Alps Electric Co., Ltd. Élément de contact mobile et dispositif de commutation utilisant un élément de contact mobile
EP2996129A1 (fr) 2014-09-11 2016-03-16 Wincor Nixdorf International GmbH Dispositif pour détecter la manipulation d'un objet
WO2016037808A1 (fr) 2014-09-11 2016-03-17 Wincor Nixdorf International Gmbh Dispositif de détection d'une manipulation d'un objet
US10229798B2 (en) 2014-09-11 2019-03-12 Wincor Nixdorf International, GmbH Device for detecting manipulation of an object

Also Published As

Publication number Publication date
DE4139554A1 (de) 1993-04-15
EP0538199A3 (en) 1993-06-30
EP0538199B1 (fr) 1997-09-03
ATE157808T1 (de) 1997-09-15
DE59208850D1 (de) 1997-10-09

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