EP1481410A1 - Folientastatur - Google Patents
FolientastaturInfo
- Publication number
- EP1481410A1 EP1481410A1 EP03709715A EP03709715A EP1481410A1 EP 1481410 A1 EP1481410 A1 EP 1481410A1 EP 03709715 A EP03709715 A EP 03709715A EP 03709715 A EP03709715 A EP 03709715A EP 1481410 A1 EP1481410 A1 EP 1481410A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- membrane keyboard
- keyboard according
- coating
- film
- 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.)
- Granted
Links
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 actuation areas, in particular for use in a potentially explosive environment, with a cover film made of insulating material, an electrically conductive layer located below the cover film and an conductor film which is insulated from the conductive layer and has a number of conductor tracks below it Actuating areas lying switching elements.
- Non-conductive materials may only be used in potentially explosive atmospheres if precautions have been taken to avoid electrostatic charging of such materials.
- Membrane keyboards generally use a plastic film to form an upper side of the keyboard touched by an operator, to which the problems described above apply if the membrane keyboard is to be used in an explosive environment.
- a previously known membrane keyboard of this type can be found in DE 199 23 806 CI.
- the known membrane keypad has a through hole next to each actuation field in order to ensure a discharge safety in a structurally simple manner, which runs past the conductive layer and the conductor foil and ends at an earthed base plate of the membrane keypad. With a sufficiently large spacing from the conductive layer and the conductor tracks of the conductor film, the through hole represents a type of “lightning arrester”, via which the charge applied to the membrane keyboard by an operator can be discharged to the underside of the keyboard.
- a decisive prerequisite for the fact that charges on the top of the membrane keyboard can be dissipated through the through hole to the underside of the membrane keyboard is that the connection formed by the through hole to a ground potential is lower than to the conductive layer or the conductor tracks.
- the invention is therefore based on the object of providing a membrane keyboard in which any electrical charge which may be present on the top of the membrane keyboard can be discharged in a structurally simple, inexpensive and permanently safe manner, so that the membrane keyboard according to the invention in particular can be used in potentially explosive environments.
- the conductive layer is designed as a coating of conductive material applied to an inside of the cover sheet, and that at least one contact element covers the cover sheet with a conductive connection permanent contacts between the cover film and at least one conductor track kept at a given potential, and that the coating at least in partial areas above the switching elements having an electrically insulate ⁇ de lacquer layer.
- a major advantage of the membrane keyboard according to the invention is that in this case the electrostatic charge is avoided or is permanently and reliably dissipated even in a damaging environment, in contrast to other previously known membrane keyboards which use metal housings or films for this purpose use with conductive admixtures, an inexpensive manufacturing process can be maintained and at the same time all the advantages of a conventional, colored and abrasion-resistant membrane keyboard are retained.
- the switching elements have pushbuttons in the form of leaf springs, via which, with sufficient pressure load, contact can be made between two conductor tracks held at different potentials, one with the leaf spring and the other with one below the leaf spring arranged base element is connected.
- leaf springs By providing leaf springs, switching operations of the membrane keyboard can be implemented in a structurally particularly simple manner.
- leaf-spring-like buttons provide the operator with optimum operating convenience, since they suddenly and clearly give in when there is sufficient pressure and generate a characteristic clicking sound, which immediately indicates to the operator that the switching process has taken place.
- 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 film and the conductive coating of the cover film can in principle be arranged in every area of the membrane keyboard, which leaves the greatest possible scope for design, in particular in the design of the membrane keyboard.
- the grid is grounded, ie connected to the ground or ground potential of a control circuit of the membrane keyboard according to the invention.
- at least one of the coated cover films is preferably permanently 5
- Renden contact elements electrically connected to the grid. In this way, safe discharge of charges that arise on the operator side of the cover film or are applied to it by an operator is ensured.
- a spacer foil with openings in the area of the contact elements is arranged between the lacquer layers and the conductor foil.
- the lacquer layers applied to the coating are colored, in particular multi-colored, while the cover film and the coating are preferably transparent at least in the visible wavelength range.
- the different operating areas of the keypad according to the invention be indicated by one below the cover sheet arranged and thus unan Corporations against Bedie ⁇ voltage induced wear color design.
- the OF INVENTION ⁇ in another embodiment is provided dung below that the conductor foil is arranged a carrier plate. It is considered to be particularly advantageous if the carrier plate is designed as a printed circuit board.
- the carrier plate can have at least one display element, which can be designed as a liquid crystal element (LCD), as an LED or as a polymer LED.
- LCD liquid crystal element
- the cover film ensures comprehensive protection of all these elements against damage caused by mechanical or other types.
- the carrier plate is connected to a base foil carrying the conductor tracks by means of a double-sided adhesive foil, as a result of which a firm and permanent arrangement is easy to manufacture.
- the coating in the area of the at least one display element is not painted and if the spacer film, the double-sided adhesive film and the conductor film have a corresponding breakthrough in this area. This ensures that the display element, despite its protected arrangement in the lower area of the membrane keyboard according to the invention, can be easily viewed by the operator from the outside.
- the coating of the cover film consists of a conductive polymer.
- the cover film in contrast to films made conductive by adding carbon, is transparent and therefore optimally suitable for use in the context of the above-described embodiments of the membrane keyboard according to the invention.
- FIG. 1 is a schematic sectional view taken approximately along the line AA 'of FIG. form of the membrane keyboard according to the invention
- FIG. 2 shows a further sectional view of an embodiment of the membrane keyboard according to the invention along the line B-B 'of FIG. 1;
- Fig. 3 is a plan view of an embodiment of the
- the membrane keyboard shown has a cover foil 1 on the top side of the keyboard, which on its underside, e.g. by vapor deposition is provided with a transparent, conductive coating 2. Lacquer layers 3, 3 'are applied to the coating 2 for a (multi-) colored design, at least one window 4 and at least one contact point 5 being left out. Below the lacquer layers 3, 3 'there is a spacer film 6 which has openings 7, 7' in the region of the lacquers 3 'or the contacting point 5 for receiving switching and contact elements 8 or 8' in the form of leaf springs 8, 8 '.
- the membrane keyboard shown has a conductor film 9, which consists of a base film 11 coated with conductor tracks 10, 10 ', 10.1, 10.2 made of silver lacquer. In the area of the conductor tracks 10 'and 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 membrane keyboard shown is firmly connected to a printed circuit board 14 by a double-sided adhesive film 13, on the underside 15 of which a liquid crystal display 16 is arranged in the area of the window 4.
- the leaf springs 8 'and the associated base element 12' are in contact Conductor tracks 10 'are connected to a ground or ground potential of a control circuit (not shown).
- the leaf spring 8 ' makes direct and permanent contact with the conductive coating 2 of the cover film 1 at the unpainted point 5, creating a conductive connection at least between the earthed conductor track 10' and the cover film 1.
- the conductor tracks 10.1, 10.2, which form the switching elements 8, 12 are at different potentials Ui or U 2 , so that in the event of the leaf spring 8 being depressed by the operator onto the base element 12 a switching process can be triggered in the control circuit, for example by switching operation of a transistor (not shown).
- the cover membrane 1 is a clear, transparent polyester plastic membrane with 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 designed as a conductive polymer layer and is preferably applied to the cover film 1 by vapor deposition. Due to its full-surface contacting of the cover film 1 and the conductive connection to the ground potential of the control circuit which is ensured via the contact element 8 ', 12', it serves for the safe dissipation of electrostatic charges. In addition, the coating 2 has a shielding effect with regard to the electromagnetic compatibility (EMC) of the membrane keyboard according to the invention.
- EMC electromagnetic compatibility
- lacquer layers 3, 3 'to the key sheet according to the invention and in particular the polymer layer 2 is abrasion ⁇ fixed.
- the section shown in FIG. 2 along the line BB 'of FIG. 1 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 Arranged in the form of a diamond-shaped grid 17, which is formed from two sheets 18, 18 'of straight conductor tracks 10 intersecting.
- the grid 17 and the conductor tracks 10 are connected via a contact tab 19 to a control circuit, not shown.
- FIG. 3 shows an exemplary embodiment of the cover film 1 of the membrane keyboard according to the invention after the coating 2 and the lacquer layers 3, 3 'have been applied. Color differences between the different lacquer layers 3, 3 'make it possible to achieve a user-friendly, in particular multicolored, design of the membrane keyboard according to the invention.
- various operating surfaces 20, which are arranged above the leaf springs 8 of FIGS. 1 and 2 are highlighted by differently colored lacquer layers 3 'compared to a background lacquer layer 3 of the membrane keyboard according to the invention.
- the cover film 1 or the coating 2 is paint-free, so that in these areas the coating 2 can be contacted by the leaf springs 8 'in the manner shown in FIG. 1.
Landscapes
- Push-Button Switches (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2002109079 DE10209079A1 (de) | 2002-03-01 | 2002-03-01 | Folientastatur |
DE10209079 | 2002-03-01 | ||
PCT/EP2003/001735 WO2003075297A1 (de) | 2002-03-01 | 2003-02-20 | Folientastatur |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1481410A1 true EP1481410A1 (de) | 2004-12-01 |
EP1481410B1 EP1481410B1 (de) | 2006-10-18 |
Family
ID=27770920
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03709715A Expired - Fee Related EP1481410B1 (de) | 2002-03-01 | 2003-02-20 | Folientastatur |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1481410B1 (de) |
AU (1) | AU2003214067A1 (de) |
DE (2) | DE10209079A1 (de) |
WO (1) | WO2003075297A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1515350A1 (de) | 2003-09-09 | 2005-03-16 | Meierhofer Mellingen AG | Beleuchtbares Tastaturelement für ein Tastaturfeld |
EP1741116A1 (de) | 2005-01-17 | 2007-01-10 | Printed Systems GmbH | Tastatur und verfahren zur herstellung einer tastatur |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005053929A1 (de) * | 2005-11-11 | 2007-05-16 | Bsh Bosch Siemens Hausgeraete | Bedienelement für Haushaltsgerät |
EP2400363A1 (de) * | 2010-06-23 | 2011-12-28 | Siemens Aktiengesellschaft | Bedieneinrichtung zur Bedienung einer Maschine aus der Automatisierungstechnik |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6199996B1 (en) | 1998-08-26 | 2001-03-13 | Twenty-First Century Technology, Inc. | Low power, low cost illuminated keyboards and keypads |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4303960A (en) * | 1979-12-31 | 1981-12-01 | Gte Products Corporation | Electrostatic discharge-protected switch |
JPS6170247U (de) * | 1984-10-05 | 1986-05-14 | ||
DE8914142U1 (de) * | 1989-11-30 | 1990-02-01 | Siemens Ag, 1000 Berlin Und 8000 Muenchen, De | |
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 | Kundisch Gmbh & Co Kg | Frontfolie für Folientastaturen o.dgl. |
DE29501466U1 (de) * | 1995-01-31 | 1995-03-30 | Kundisch Gmbh & Co Kg | Transparente Folie, insbesondere zur Herstellung von Frontfolien für Folientastaturen o.dgl. |
KR970049350A (ko) * | 1995-12-19 | 1997-07-29 | 윤종용 | 터치패널 |
US6185108B1 (en) * | 1997-07-31 | 2001-02-06 | Toyotomi Co., Ltd. | Equipment control panel with operation signal generating switch |
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 |
-
2002
- 2002-03-01 DE DE2002109079 patent/DE10209079A1/de not_active Withdrawn
-
2003
- 2003-02-20 WO PCT/EP2003/001735 patent/WO2003075297A1/de active IP Right Grant
- 2003-02-20 EP EP03709715A patent/EP1481410B1/de not_active Expired - Fee Related
- 2003-02-20 DE DE50305415T patent/DE50305415D1/de not_active Expired - Lifetime
- 2003-02-20 AU AU2003214067A patent/AU2003214067A1/en not_active Abandoned
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6199996B1 (en) | 1998-08-26 | 2001-03-13 | Twenty-First Century Technology, Inc. | Low power, low cost illuminated keyboards and keypads |
Non-Patent Citations (2)
Title |
---|
JAMES GW FISHER: "Introducing Eluminx", WWW.ELUMINX.COM, 13 March 2003 (2003-03-13), pages 1, XP002993584, Retrieved from the Internet <URL:www.eluminx.com> |
See also references of WO03075297A1 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1515350A1 (de) | 2003-09-09 | 2005-03-16 | Meierhofer Mellingen AG | Beleuchtbares Tastaturelement für ein Tastaturfeld |
EP1741116A1 (de) | 2005-01-17 | 2007-01-10 | Printed Systems GmbH | Tastatur und verfahren zur herstellung einer tastatur |
Also Published As
Publication number | Publication date |
---|---|
EP1481410B1 (de) | 2006-10-18 |
WO2003075297A1 (de) | 2003-09-12 |
AU2003214067A1 (en) | 2003-09-16 |
DE50305415D1 (de) | 2006-11-30 |
DE10209079A1 (de) | 2003-10-16 |
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