EP0622818A2 - Commutateur à touche - Google Patents

Commutateur à touche Download PDF

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Publication number
EP0622818A2
EP0622818A2 EP94106368A EP94106368A EP0622818A2 EP 0622818 A2 EP0622818 A2 EP 0622818A2 EP 94106368 A EP94106368 A EP 94106368A EP 94106368 A EP94106368 A EP 94106368A EP 0622818 A2 EP0622818 A2 EP 0622818A2
Authority
EP
European Patent Office
Prior art keywords
switch according
push button
button switch
printed circuit
ring body
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.)
Withdrawn
Application number
EP94106368A
Other languages
German (de)
English (en)
Other versions
EP0622818A3 (fr
Inventor
Helmut Dipl.-Ing. Gaissert
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.)
Harman Becker Automotive Systems GmbH
Original Assignee
Becker 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 Becker GmbH filed Critical Becker GmbH
Publication of EP0622818A2 publication Critical patent/EP0622818A2/fr
Publication of EP0622818A3 publication Critical patent/EP0622818A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/36—Contacts characterised by the manner in which co-operating contacts engage by sliding
    • H01H1/40—Contact mounted so that its contact-making surface is flush with adjoining insulation
    • H01H1/403—Contacts forming part of a printed circuit
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2205/00—Movable contacts
    • H01H2205/002—Movable contacts fixed to operating part
    • 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
    • H01H2215/012—Positioning of individual dome
    • 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

Definitions

  • the invention relates to a push button switch for contacting a fixed contact arranged on a printed circuit board with a mating contact which can be fastened to the printed circuit board and is axially pressed onto the fixed contact and which is provided with a flexible membrane.
  • Such a push button switch is known (brochure: "Plastic contact elements KE 1 and KE 2" from Marquardt GmbH, 78604 Rietheim-Weilheim).
  • the axially press-on mating contact has a square frame with snap-on feet integrally formed on the corners of the frame, with which the frame is fastened by snapping into holes in the circuit board.
  • a pot-shaped tappet is arranged coaxially to the frame with the interposition of a plate-shaped membrane. The contact is attached to the outside of its bottom.
  • the known push button switch has the disadvantage, on the one hand, that the upper end of the mating contact must be guided in its direction of confirmation.
  • the type of attachment of the mating contact on the circuit board is not easy to assemble because four fastening elements have to be inserted into holes and locked into place.
  • the known pushbutton switch of such large size has proven that it is not possible to accommodate a large number of such pushbutton switches on a smaller circuit board.
  • the technical problem underlying the invention now consists in creating a pushbutton switch, the counter contact of which is easier to attach to the printed circuit board in a smaller size and is largely self-guiding and is easy to manufacture.
  • the counter-contact consists of a rigid ring body which is connected to a central pin via a plate-shaped membrane.
  • the mating contact according to the invention is a sufficiently rigid element which can be fastened to the printed circuit board in a simple, durable manner with the centrally arranged pin and does not require any special guidance.
  • the area of use of the pushbutton switch according to the invention is significantly expanded.
  • This encapsulation can be achieved by using an elastic wall between the ring body and the circuit board.
  • the wall separates the area of the contact points from the environment, among other things, in a dust and moisture-proof manner and thus encapsulates them.
  • This wall is designed to be elastic so that the sealing effect in the different switching states - ring body lying on or off the circuit board - is ensured.
  • This sealing effect can be achieved by fixed connections between the wall and the ring body and / or the circuit board or by releasable connections.
  • B. Tongue-and-groove connection may also be carried out with an undercut.
  • the shape of the encapsulation with detachable connections ensures a particularly advantageous simple assembly with a small size, since the tight connection is achieved by simply snapping it into place.
  • the push button switch is preferably designed as an illuminated switch which contains the light source in the central pin.
  • light sources are light emitting diodes, miniature incandescent lamps or the ends of optical waveguides.
  • LEDs and fiber optic cables are particularly advantageous.
  • the LEDs and fiber optic cables are preferably formed using recesses in the plate-shaped membrane.
  • the light source can even form the central pin itself.
  • the membrane with the ring body is then attached to this. The attachment is preferably ensured by means of an undercut.
  • the counter contact with the central pin, the ring body and the plate-shaped membrane is preferably produced from plastic in an injection molding process.
  • This enables simple, quick and cheap manufacture of the push-button switch according to the invention, which only has to be provided with a conductive layer on the side of the printed circuit board facing the contacts in order to enable reliable contacting.
  • An example of a suitable plastic is "Hytrel G-3548W" - material name from Dupont.
  • this manufacturing step can also be omitted by using metal as the material for the mating contact, since the metal is electrically conductive.
  • a composite material made of plastic and metal has proven to be an optimized material, which is made of metal in particular in the area of the ring body and preferably made of plastic in the area of the pin and the membrane. In this case, the cheapest material can be used, optimized according to function.
  • the mating contact 1 according to the exemplary embodiment in FIG. 2 differs from the exemplary embodiment according to FIG. 1 by the pin 10.
  • the pin 10 is provided with a slot 11, so that the pin (10) has elastic properties when it is introduced into the Bore of the circuit board (5) is narrowed and then releasably fixed in the end position by its resilient action. If the pin (10) is provided with an undercut, the mating contact 1 can be detachably and securely fastened in an advantageously simple manner by latching the pin 10 into the bore in the printed circuit board 5.
  • Fig. 3 shows a mating contact 1, which was attached to the circuit board 5 by gluing.
  • the counter contact 1 consists of a central pin 4, a flexible membrane 3 connected thereto, which carries an annular body 2.
  • the ring body 2 shows an electrically conductive contact layer 6 on the side facing the printed circuit board 5.
  • An elastic wall 12 is attached to the outside of the ring body 2, which extends to the circuit board 5 and closes the area of the contact elements 6 on the ring body 2 and the contact elements 6a on the circuit board 5 from the outside world in a dustproof and moisture-proof manner.
  • central pin 4 there is also a cylindrical recess 13 which, after the mating contact 1 has been fastened, is filled with a translucent elastic covering compound.
  • This masking compound protects the LED 14 mounted on the circuit board using chip-on-board technology and gives the pin an aligning stiffness.
  • Fig. 4 shows an embodiment of the pushbutton switch
  • the counter contact 1 has a central pin 4, which is formed by an LED 14 in the conventional manner.
  • the LED 14 shows in its central part an undercut 15 in which the plastic part with the membrane 3 and the ring body 2 releasably engages.
  • the LED 14 is first firmly attached to the printed circuit board 5 and, in a further step, the plastic part is placed on to complete the mating contact 1. This simplifies the manufacture of the switch.

Landscapes

  • Push-Button Switches (AREA)
EP94106368A 1993-04-28 1994-04-23 Commutateur à touche. Withdrawn EP0622818A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4313870 1993-04-28
DE19934313870 DE4313870A1 (de) 1993-04-28 1993-04-28 Tastschalter

Publications (2)

Publication Number Publication Date
EP0622818A2 true EP0622818A2 (fr) 1994-11-02
EP0622818A3 EP0622818A3 (fr) 1995-08-02

Family

ID=6486566

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94106368A Withdrawn EP0622818A3 (fr) 1993-04-28 1994-04-23 Commutateur à touche.

Country Status (2)

Country Link
EP (1) EP0622818A3 (fr)
DE (1) DE4313870A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3819895A (en) * 1972-10-04 1974-06-25 Lectradate Inc Electronic momentary switch
US3916360A (en) * 1974-08-09 1975-10-28 Singer Co Magnetic keyboard
FR2441259A1 (fr) * 1978-11-06 1980-06-06 Itt Commutateur electrique a bouton-poussoir pour circuits imprimes
EP0242441A2 (fr) * 1986-04-21 1987-10-28 Tektronix, Inc. Dispositif de commutation
DE4103150C1 (fr) * 1991-02-02 1992-04-16 Blaupunkt-Werke Gmbh, 3200 Hildesheim, De

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3819895A (en) * 1972-10-04 1974-06-25 Lectradate Inc Electronic momentary switch
US3916360A (en) * 1974-08-09 1975-10-28 Singer Co Magnetic keyboard
FR2441259A1 (fr) * 1978-11-06 1980-06-06 Itt Commutateur electrique a bouton-poussoir pour circuits imprimes
EP0242441A2 (fr) * 1986-04-21 1987-10-28 Tektronix, Inc. Dispositif de commutation
DE4103150C1 (fr) * 1991-02-02 1992-04-16 Blaupunkt-Werke Gmbh, 3200 Hildesheim, De

Also Published As

Publication number Publication date
DE4313870A1 (de) 1994-11-03
EP0622818A3 (fr) 1995-08-02

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