EP0347375B1 - Drucktastenanordnung in einer Leiterplatte - Google Patents

Drucktastenanordnung in einer Leiterplatte 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)
English (en)
French (fr)
Other versions
EP0347375A1 (de
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
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=4229866&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0347375(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Elma Electronic AG filed Critical Elma Electronic AG
Publication of EP0347375A1 publication Critical patent/EP0347375A1/de
Application granted granted Critical
Publication of EP0347375B1 publication Critical patent/EP0347375B1/de
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)
EP19890810409 1988-06-14 1989-06-01 Drucktastenanordnung in einer Leiterplatte Revoked EP0347375B1 (de)

Applications Claiming Priority (2)

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

Publications (2)

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

Family

ID=4229866

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890810409 Revoked EP0347375B1 (de) 1988-06-14 1989-06-01 Drucktastenanordnung in einer Leiterplatte

Country Status (3)

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

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4139554A1 (de) * 1991-10-14 1993-04-15 Fela Mikrotechnik Ag Elektrischer tastschalter
DE4213084A1 (de) * 1992-04-21 1993-01-07 Bock Hans A Dipl Ing Tu (tast)schalter im lenkrad oder in konsolen, armlehnen etc. zur bedienung durch die "elastische haut" (kunststoff) der oberflaeche
DE19823894C1 (de) * 1998-04-18 2000-01-05 Inovan Stroebe Schnappscheibenschalter mit Befestigungselement
DE19847614A1 (de) * 1998-10-15 2000-05-04 Magenwirth Gmbh Co Gustav Sprungschalter
US6423918B1 (en) * 2000-03-21 2002-07-23 Lear Corporation Dome switch
DE10315202A1 (de) * 2003-04-03 2004-10-14 Leopold Kostal Gmbh & Co. Kg Fernbedienung zum Betätigen einer Schließeinrichtung eines Kraftfahrzeuges

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 (de) * 1979-01-25 1982-12-09 Rudolf Schadow Gmbh, 1000 Berlin Drucktastenschalter
US4365120A (en) * 1981-04-13 1982-12-21 Kb Denver, Inc. Illuminated keyboard
DE3145434A1 (de) * 1981-11-16 1983-05-26 Kundisch GmbH, 7730 Villingen-Schwenningen Folientastatur mit druckpunkt

Also Published As

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

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