EP1481410B1 - Clavier a effleurement - Google Patents

Clavier a effleurement Download PDF

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Publication number
EP1481410B1
EP1481410B1 EP03709715A EP03709715A EP1481410B1 EP 1481410 B1 EP1481410 B1 EP 1481410B1 EP 03709715 A EP03709715 A EP 03709715A EP 03709715 A EP03709715 A EP 03709715A EP 1481410 B1 EP1481410 B1 EP 1481410B1
Authority
EP
European Patent Office
Prior art keywords
film
keyboard according
coating
conductor
conductive
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
EP03709715A
Other languages
German (de)
English (en)
Other versions
EP1481410A1 (fr
Inventor
Stefan Becker
Winfried Meissner
Ignaz Urrigshardt
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.)
Heinrichs Messtechnik GmbH
Original Assignee
Heinrichs Messtechnik 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
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Application filed by Heinrichs Messtechnik GmbH filed Critical Heinrichs Messtechnik GmbH
Publication of EP1481410A1 publication Critical patent/EP1481410A1/fr
Application granted granted Critical
Publication of EP1481410B1 publication Critical patent/EP1481410B1/fr
Anticipated expiration legal-status Critical
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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
    • H01H2209/00—Layers
    • H01H2209/014—Layers composed of different layers; Lubricant in between
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2209/00—Layers
    • H01H2209/068—Properties of the membrane
    • H01H2209/082—Properties of the membrane transparent
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2219/00—Legends
    • H01H2219/028—Printed information
    • H01H2219/034—Coloured areas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2239/00—Miscellaneous
    • H01H2239/008—Static electricity considerations
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/02—Bases, casings, or covers
    • H01H9/04—Dustproof, splashproof, drip-proof, waterproof, or flameproof casings
    • H01H9/042—Explosion-proof cases

Definitions

  • the invention relates to a membrane keyboard with a number of operating areas, in particular for use in potentially explosive environments, with a cover sheet of insulating material, an electrically conductive layer located below the cover film and a conductor foil arranged below the conductive layer and having a number of conductor tracks with below Operating areas lying switching elements.
  • Non-conductive materials may only be used in potentially explosive atmospheres if measures have been taken to prevent electrostatic charging of such materials.
  • Membrane keyboards usually use for training a touched by an operator keyboard top a plastic film to which the above-mentioned problem applies when the membrane keyboard is to be used in a hazardous environment.
  • a previously known membrane keyboard of this kind can be taken from DE 199 23 806 C1 or EP 936852.
  • the well-known membrane keyboard has a structurally simple guarantee of discharge safety next to each actuation field on a through hole which extends past the conductive layer and the conductor foil and ends at a grounded base plate of the membrane keyboard.
  • the through hole with a sufficiently large spacing from the conductive layer and the conductor tracks of the conductor foil, constitutes a type of "lightning conductor" via which the charge applied by an operator to the membrane keypad can be diverted to the underside of the keyboard.
  • a crucial precondition for the fact that charges present on the upper side of the membrane keypad can be diverted through the through-hole to the underside of the membrane keypad is that the connection formed through the through-hole is lower resistance to a ground potential than to the conductive layer or the conductor tracks. This is not the case, in particular, if a high-impedance covering forms in the region of the base plate of the known membrane keypad, for example an oxidation layer, which is predetermined to the environment due to the opening formed through the through-hole.
  • penetrating substances of increased conductivity in particular fluids, contribute to the creation of a low-resistance connection to the conductive layer and / or the conductor tracks, whereby the functionality of the known membrane keyboard would at least reduced, which represents a blatant security risk especially in hazardous environments.
  • the invention is therefore based on the object to provide a membrane keyboard, in which an optionally present on the top of the membrane keyboard electrical charge can be derived in a structurally simple, cost-effective and permanently safe way, so that the membrane keyboard according to the invention can be used in particular in potentially explosive environments is.
  • a membrane keypad of the type mentioned in the present invention that the conductor yields, as a conductor is formed film and that at least one contact element, the coating of the cover sheet to create a conductive connection between the cover sheet and at least one held at a certain potential trace permanent touched.
  • An essential advantage of the membrane keypad according to the invention is that in this case the electrostatic charge is avoided or permanently safely dissipated in a damaging environment, in contrast to other previously known membrane keyboards, the metal housing or foils for this purpose with conductive admixtures, a low-cost manufacturing process can be maintained while retaining all the benefits of a conventional, colored and abrasion-resistant membrane keyboard.
  • the switching elements have buttons in the form of leaf springs, on the sufficient contact pressure contact between two held at different potential interconnects can be produced, one with the leaf spring, the other with a below the leaf spring arranged base element is connected.
  • leaf springs By providing leaf springs, switching operations of the membrane keyboard can be realized in a structurally particularly simple manner.
  • leaf spring-like feelers give the operator an optimal ease of use, as they give suddenly and clearly noticeable with sufficient pressure load and thereby generate a characteristic crackling noise, which the operator immediately indicates the switching process.
  • the conductor foil can have a conductive grid of at least two sets of intersecting conductor tracks.
  • the conductive connection according to the invention between at least one conductor track of the conductor foil and the conductive coating of the cover foil can in principle be arranged in each area of the membrane keypad, which leaves the greatest possible design freedom, in particular in the design of the membrane keypad.
  • the grid is grounded, ie connected to the ground or ground potential of a control circuit of the membrane keypad according to the invention.
  • at least one of the coated cover film permanently touching Contact elements electrically conductively connected to the grid. In this way, a safe dissipation of charges is ensured, which arise on the operator side of the cover sheet or applied by an operator to this.
  • a spacer foil with openings in the region of the contact elements is arranged in an advantageous embodiment of the membrane keypad according to the invention between the lacquer layers and the conductor foil.
  • the paint layers applied to the coating are colored, in particular multicolored, while the cover film and the coating are preferably transparent at least in the visible wavelength range.
  • the different control surfaces of the membrane keypad according to the invention can be identified by an arranged below the cover sheet and thus unresponsive to wear and tear-resistant colored design.
  • a carrier plate is arranged below the conductor foil. It is considered particularly advantageous if the carrier plate is designed as a printed circuit board.
  • the carrier plate may have at least one display element, which may be formed as a liquid crystal element (LCD), as an LED or as a polymer LED.
  • LCD liquid crystal element
  • the membrane keypad according to the invention makes it possible to achieve a compact arrangement of all relevant operating and control elements, wherein the cover sheet ensures comprehensive protection of all these elements against damage of a mechanical or other nature.
  • the carrier plate is connected to a base film carrying the conductor tracks by a double-adhesive film, whereby an easily produced solid and permanent arrangement is given.
  • the coating is not painted in the region of the at least one display element and if the spacer film, the double-adhesive film and the conductor film have a corresponding breakthrough in this region. This ensures that the display element, despite its protected arrangement in the lower region of the membrane keypad according to the invention for the operator from the outside is easily visible.
  • the coating of the cover sheet consists of a conductive polymer.
  • the cover film in contrast to films made conductive by carbon admixtures, is transparent and therefore optimally suitable for use in the context of the above-described embodiments of the membrane keyboard according to the invention.
  • the illustrated keypad on the keyboard top has a cover sheet 1 which is provided on its underside, e.g. by vapor deposition, with a transparent, conductive coating 2 is provided.
  • Coating layers 3, 3 ' are applied to the coating 2 for a (multi-) colored design, with at least one window 4 and at least one contacting point 5 being recessed.
  • Below the paint layers 3, 3 ' there is a spacer film 6, in the region of the coatings 3' and the contact point 5 openings 7, 7 'for receiving switching and contact elements 8 and 8' in the form of leaf springs 8, 8 ' having.
  • the membrane keyboard shown has a conductor foil 9 which consists of a base film 11 coated with conductor tracks 10, 10 ', 10.1, 10.2 of silver lacquer. In the area of the strip conductors 10 'or 10.1., 10.2, further switching elements are arranged as base elements 12, 12' below the leaf springs 8, 8 '.
  • the base film 11 of the illustrated membrane keyboard is connected by a double-adhesive film 13 fixed to a printed circuit board 14, on the underside 15 in the region of the window 4, a liquid crystal display 16 is arranged.
  • the leaf spring 8 'and the associated base member 12' are contacting Conductor tracks 10 'connected to a ground potential of a control circuit (not shown).
  • the leaf spring 8 ' contacts the conductive coating 2 of the cover film 1 at the non-lacquered point 5 directly and permanently, creating a conductive connection at least between the grounded conductor 10' and the cover film 1.
  • the conductor tracks 10.1, 10.2, which comprise the switching elements 8, 12 contact (of which only a pair is shown in the section of FIG. 1), are at different potentials U 1 and U 2 , so that in the case of a caused by the operator depression of the leaf spring 8 on the base member 12 in the control circuit a switching operation, for example by switching operation of a transistor (not shown), can be triggered.
  • the cover sheet 1 is a clear, transparent polyester plastic film having a thickness of less than 200 micrometers, so that electrostatic charging is minimized. It serves as a protective layer for the membrane keyboard.
  • the coating 2 is formed as a conductive polymer layer and is preferably applied to the cover sheet 1 by vapor deposition. It serves on the basis of their contact over the entire surface of the cover sheet 1 and the over the contact element 8 ', 12' secured conductive connection to the ground potential of the control circuit of the safe dissipation of electrostatic charges.
  • the coating 2 has a shielding effect with regard to the electromagnetic compatibility (EMC) of the membrane keypad according to the invention.
  • EMC electromagnetic compatibility
  • the membrane keypad according to the invention and in particular the polymer layer 2 is abrasion resistant.
  • Leaf springs 8 can increase the ease of use of the membrane keypad invention.
  • FIG. 2 shows in detail the arrangement of the conductor tracks 10, 10 ', 10.1, 10.2 on the surface of the base film 11.
  • the conductor tracks 10 are partially in.
  • FIG Formed a diamond-shaped grid 17, which is formed from two flocks 18,18 'intersecting straight conductor tracks 10.
  • the grid 17 and the tracks 10 are connected via a contact lug 19 with a control circuit, not shown.
  • at least the interconnects 18,18 'forming the grid 17, and the interconnects 10', which contact the leaf springs acting as contact elements 8 'and even in the embodiment shown are part of the grid, at the ground potential of the control circuit.
  • FIG. 3 shows an embodiment of the cover sheet 1 of the membrane keypad according to the invention after the coating 2 has been applied and the lacquer layers 3, 3 'have been applied.
  • various control surfaces 20, which are arranged above the leaf springs 8 of Figures 1 and 2, highlighted by differently colored lacquer layers 3 'against a background lacquer layer 3 of the membrane keypad according to the invention.
  • the cover film 1 or the coating 2 is free of lacquer, so that contacting of the coating 2 by the leaf springs 8 'in the manner shown in FIG. 1 can take place in these regions.

Landscapes

  • Push-Button Switches (AREA)

Claims (15)

  1. Clavier à effleurement présentant une pluralité de zones d'activation, prévu en particulier pour une utilisation en zone à risque d'explosion, comprenant une feuille de couverture (1) en matériau isolant, une couche électriquement conductrice située en-dessous de la feuille de couverture (1), la couche conductrice (2) étant réalisée sous la forme d'un revêtement (2) en matériau conducteur appliqué sur la face interne de la feuille de couverture (1) et le revêtement (2) présentant par ailleurs une couche de vernis (3, 3') électriquement isolante au moins dans des zones partielles (3') situées au-dessus d'éléments de circuit (8), et comprenant un support de conducteur(s) (9) présentant une pluralité de pistes conductrices (19) disposé de manière isolée par rapport à la couche conductrice, avec des éléments de circuit situés en-dessous des zones d'activation, caractérisé en ce que le support de conducteur(s) est réalisé sous la forme d'une feuille conductrice et en ce qu'au moins un élément de contact (8') est en contact permanent avec le revêtement (2) de la feuille de couverture (1) créant ainsi une relation conductrice entre la feuille de couverture (1) et au moins une piste conductrice (10') maintenue à un potentiel défini.
  2. Clavier à effleurement selon la revendication 1, caractérisé en ce que les éléments de circuit (8) présentent des palpeurs sous la forme de ressorts à lames.
  3. Clavier à effleurement selon la revendication 1 ou 2, caractérisé en ce que la feuille conductrice (9) présente une grille (17) conductrice composée d'au moins deux réseaux (18, 18') de pistes conductrices (10) entrecroisées.
  4. Clavier à effleurement selon la revendication 3, caractérisé en ce que la grille (17) est reliée à la terre.
  5. Clavier à effleurement selon la revendication 4, caractérisé en ce que l'au moins un élément de contact (8) en contact permanent avec le revêtement (2) de la feuille de couverture (1) est relié de manière électriquement conductrice au réseau (17).
  6. Clavier à effleurement selon l'une quelconque des revendications précédentes, caractérisé en ce qu'une feuille d'écartement (6) présentant des perçages (7,7') est disposée entre les couches de vernis (3,3') et la feuille conductrice (9) dans la zone des éléments de contact (8') et des éléments de circuit (8).
  7. Clavier à effleurement selon l'une quelconque des revendications précédentes, caractérisé en ce que les couches de vernis (3,3') sont colorées, en particulier multicolores.
  8. Clavier à effleurement selon l'une quelconque des revendications précédentes, caractérisé en ce que la feuille de couverture (1) et le revêtement (2) conducteur sont transparents, au moins dans la zone des longueurs d'onde visibles.
  9. Clavier à effleurement selon l'une quelconque des revendications précédentes, caractérisé en ce qu'une plaque-support (14) est disposée sous la feuille conductrice (9).
  10. Clavier à effleurement selon la revendication 9, caractérisé en ce que la plaque-support (14) est réalisée sous la forme d'une plaque porteuse de conducteur(s).
  11. Clavier à effleurement selon la revendication 10, caractérisé en ce que la plaque-support (14) présente au moins un élément d'affichage (16).
  12. Clavier à effleurement selon la revendication 11, caractérisé en ce que l'élément d'affichage (16) est réalisé sous la forme d'un éléments à cristaux liquides.
  13. Clavier à effleurement selon l'une quelconque des revendications 9 à 12, caractérisé en ce que la plaque-support (14) est reliée à l'une des feuilles de base (11) portant les pistes conductrices (10) par une feuille autocollante double face (13).
  14. Clavier à effleurement selon l'une quelconque des revendications 11 à 13, caractérisé en ce que le revêtement (2) n'est pas verni dans la zone de l'au moins un élément d'affichage (16) et en ce que la feuille d'écartement (6), la feuille autocollante double face (13) ainsi que la feuille conductrice (9) présentent dans cette zone un perçage (4) correspondant.
  15. Clavier à effleurement selon l'une quelconque des revendications précédentes, caractérisé en ce que le revêtement (2) est réalisé dans un polymère conducteur.
EP03709715A 2002-03-01 2003-02-20 Clavier a effleurement Expired - Lifetime EP1481410B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10209079 2002-03-01
DE2002109079 DE10209079A1 (de) 2002-03-01 2002-03-01 Folientastatur
PCT/EP2003/001735 WO2003075297A1 (fr) 2002-03-01 2003-02-20 Clavier a effleurement

Publications (2)

Publication Number Publication Date
EP1481410A1 EP1481410A1 (fr) 2004-12-01
EP1481410B1 true EP1481410B1 (fr) 2006-10-18

Family

ID=27770920

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03709715A Expired - Lifetime EP1481410B1 (fr) 2002-03-01 2003-02-20 Clavier a effleurement

Country Status (4)

Country Link
EP (1) EP1481410B1 (fr)
AU (1) AU2003214067A1 (fr)
DE (2) DE10209079A1 (fr)
WO (1) WO2003075297A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE505803T1 (de) 2003-09-09 2011-04-15 Schurter Input Systems Ag Beleuchtbares tastaturelement für ein tastaturfeld
DE102005002149A1 (de) 2005-01-17 2006-07-20 Printed Systems Gmbh Tastatur und Verfahren zur Herstellung einer Tastatur
DE102005053929A1 (de) * 2005-11-11 2007-05-16 Bsh Bosch Siemens Hausgeraete Bedienelement für Haushaltsgerät
EP2400363A1 (fr) 2010-06-23 2011-12-28 Siemens Aktiengesellschaft Dispositif de commande destiné à la commande d'une machine issue de la technique d'automatisation

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4303960A (en) * 1979-12-31 1981-12-01 Gte Products Corporation Electrostatic discharge-protected switch
JPS6170247U (fr) * 1984-10-05 1986-05-14
DE8914142U1 (de) * 1989-11-30 1990-02-01 Siemens Ag, 1000 Berlin Und 8000 Muenchen Schaltfolie
DE4437616C2 (de) * 1994-05-13 1997-03-06 Kundisch Gmbh & Co Kg Verfahren zur Herstellung von Frontfolien für Folientastaturen o. dgl.
DE29505969U1 (de) * 1994-10-21 1995-06-14 Celfa Ag, Seewen Frontfolie für Folientastaturen o.dgl.
DE29501466U1 (de) * 1995-01-31 1995-03-30 Celfa Ag, Seewen Transparente Folie, insbesondere zur Herstellung von Frontfolien für Folientastaturen o.dgl.
KR970049350A (ko) * 1995-12-19 1997-07-29 윤종용 터치패널
JP3843461B2 (ja) * 1997-07-31 2006-11-08 株式会社トヨトミ 機器操作用パネル
US6199996B1 (en) 1998-08-26 2001-03-13 Twenty-First Century Technology, Inc. Low power, low cost illuminated keyboards and keypads
DE19923806C1 (de) * 1999-05-19 2001-02-08 Siemens Ag Folientastatur
DE10040151C1 (de) * 2000-08-17 2002-01-31 Schurter Gmbh Tastatur zum sicheren Auslösen von elektrischen Schaltfunktionen

Also Published As

Publication number Publication date
DE50305415D1 (de) 2006-11-30
WO2003075297A1 (fr) 2003-09-12
DE10209079A1 (de) 2003-10-16
EP1481410A1 (fr) 2004-12-01
AU2003214067A1 (en) 2003-09-16

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