EP0135835A2 - Clavier flexible - Google Patents

Clavier flexible Download PDF

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Publication number
EP0135835A2
EP0135835A2 EP19840110258 EP84110258A EP0135835A2 EP 0135835 A2 EP0135835 A2 EP 0135835A2 EP 19840110258 EP19840110258 EP 19840110258 EP 84110258 A EP84110258 A EP 84110258A EP 0135835 A2 EP0135835 A2 EP 0135835A2
Authority
EP
European Patent Office
Prior art keywords
membrane keyboard
conductive
switching chamber
keyboard according
strip
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Withdrawn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
EP19840110258
Other languages
German (de)
English (en)
Inventor
Gerhard Hochgesang
Jürgen Dipl.-Ing. Oelsch
Bertold Stürmer
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.)
Preh GmbH
Original Assignee
Preh 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 Preh GmbH filed Critical Preh GmbH
Publication of EP0135835A2 publication Critical patent/EP0135835A2/fr
Withdrawn legal-status Critical Current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
    • H01H13/702—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 with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2203/00—Form of contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2203/00—Form of contacts
    • H01H2203/036—Form of contacts to solve particular problems
    • H01H2203/046—Form of contacts to solve particular problems to save ink
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2203/00—Form of contacts
    • H01H2203/036—Form of contacts to solve particular problems
    • H01H2203/054—Form of contacts to solve particular problems for redundancy, e.g. several contact pairs in parallel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2239/00—Miscellaneous
    • H01H2239/03—Avoiding erroneous switching

Definitions

  • the invention relates to a membrane keyboard with a lower and upper carrier foil each carrying a strip-shaped conductive covering and a spacing foil between the carrier foils, which forms at least one switching chamber in which the strip-shaped conductive coverings cross each other, and when one of the carrier foils is pressurized, the conductive coverings in at least one Contact crossing point.
  • Such a membrane keyboard is known on the market.
  • the two conductive linings are each of a circular ring and parallel chords in this educated.
  • the parallel chords of the two circular rings are perpendicular to each other.
  • the two circular rings and the tendons face each other at the crossing points. Overall, there are only a few free spots on the two carrier foils within the interrupter chamber, and there are small spots in relation to the interrupter chamber surface.
  • the conductive coverings are each formed by a circular area.
  • the circular areas must not be too small, otherwise the contacting required when pressure is applied is not ensured.
  • the object of the invention is half, to design a membrane keyboard of the type mentioned in such a way that the surfaces of the conductive linings facing each other in the switching chamber are small in relation to the switching chamber surface, but without the contact making when pressure is applied being unsafe.
  • the above object is achieved in the case of a membrane keyboard of the type mentioned at the outset in that, within the switching chamber, the conductive covering of the upper carrier film, apart from at the intersection (s), only faces those areas of the lower supporting film which are free of the conductive covering and that within the switching chamber the conductive covering the lower carrier film, apart from at the intersection (s), only faces those areas of the upper carrier film which are free of conductive coating.
  • the points at which areas of the guide linings face each other are limited to the crossing points.
  • the crossing points themselves are very small compared to the switching chamber area. The fact that at least two, preferably several. Intersection points are provided, the necessary contact is guaranteed when pressure is applied.
  • the contact zone in the invention is divided into several defined crossing points.
  • the likelihood that unwanted short circuits will occur is very low. This is because it is unlikely that particles forming unevenness are present precisely at the crossing points.
  • Another major advantage is that for the conductive coatings that contain silver, much less application mass is required than with conductive coverings, which essentially cover the entire switching chamber area.
  • the guide linings are led out of the switching chamber at connection areas, the two connection areas are located at different points in the switching chamber and the guide linings extend beyond the crossing points at the areas opposite the connection areas with respect to the crossing points. This is advantageous since, in order to create the crossing points, no narrow tolerances have to be observed when assigning the two carrier foils.
  • strip width of the strip-shaped conductive coverings is narrower than the conductor tracks of the carrier film.
  • the strip width is preferably approximately half as wide as the width of the conductor tracks.
  • a membrane keyboard has a lower carrier film 1 and an upper carrier film 2. Both foils 1 and 2 are glued to a spacer foil 3. The spacer film 3 is provided with holes which form switching chambers 4.
  • the lower carrier film 1 is provided with a strip-shaped conductive covering 5.
  • a strip-shaped conductive covering 6 of the upper carrier film 2 is located within the switching chamber 4.
  • the conductive coatings 5 and 6 are connected to conductor tracks 7 and 8 of the lower and upper carrier films.
  • the conductor tracks 7 and 8 run outside the switching chamber 4.
  • connection area 11 which lies between the intersection points 10 and the conductor tracks 7 and 8
  • cross-over area 12 which lies between the individual intersection points 10
  • the strip-shaped guide linings 5, 6 are arranged such that they do not face each other in the connection areas 11 and the protruding areas 13. In the intersection areas 12, they only face each other at the intersection points 10. Any unevenness in the conductive covering layer, such as embedded particles, do not lead to short-circuits of the conductive coatings 5 and 6 in the chosen mutual arrangement of the conductive coatings 5 and 6, since the conductive coatings 5 and 6 predominantly face such areas of the other carrier foil 2 and 1, respectively that are free of conductive surface.
  • the width B of the strips forming the conductive coverings 5 and 6 is substantially smaller than the width H of the conductor tracks 7 and 8.
  • the width B is approximately half the width H.
  • the width B is, for example, 0.5 mm.
  • Overall, the total area that the guide linings 5 and 6 have is very small in comparison to the base area of the switching chamber 4.
  • the area of the conductive covering 5 or 6 is approximately 5 to 15% of the area of the switching chamber 4.
  • the conductive covering 5 and the conductive covering 6 are each formed by a pair of parallel, straight strips 14, 15 and 16, 17.
  • the strips 14, 15 are perpendicular to the Stripes 16 and 17.
  • the distance A between the stripes 14 and 15 or 16 and 17 is approximately as large as the stripe width B.
  • the crossing points 10 thus lie on a circle concentric to the switching chamber 4, the diameter of which is very small compared to the diameter of the Switching chamber 4 is.
  • the diameter of the circle is 15% of the diameter of the switching chamber 4.
  • the switching chamber diameter is, for example, 10 mm.
  • the guide linings 5 and 6 are each formed by an oval ring 18 and 19, respectively.
  • the main axes of the oval rings 18 and 19 are approximately perpendicular to each other.
  • the guide covering 5 is formed by a circular ring 20.
  • the conductive covering 6 forms strips 16 and 17.
  • the diameter of the circular ring 20 is greater than the distance A of the strips 16 and 17.
  • Four crossing points 10 lie on the circle formed by the circular ring 20.
  • the width B of the circular ring 20 and the oval rings 18 and 19 is equal to the width B of the strips 16 and 17.
  • the strips 14, 15 intersect with the strips 16, 17 at an acute angle.
  • the strips 14 and 15 or 16 and 17 in the protruding areas 13 are connected by webs 21 and 22.
  • the four crossing points 10 are created.
  • the conductive covering 5 is formed by two strips 23, 24, which diverge in a V-shape from the conductor track 7 in the switching chamber 4.
  • the conductive covering 6 is formed by three strips 25, 26, 27, the two outer ones of which diverge from the conductor track 8 in the switching chamber 4 in a V shape. There are six intersections 10 here.
  • the guide covering 6 is formed by a cross with two intersecting strips 28 and 29.
  • the guide covering 5 is designed as in FIG. 4.
  • the crossing point of the strips 28 and 29 lies approximately in the middle of the circular ring 20.
  • the strips 28 and 29 cross the circular ring 20, so that four crossing points 10 arise.
  • the guide covering 5 is designed as in FIG. 4.
  • the guide layer 6 is branched in a star shape into two branches 30 and 31. There are three crossing points 10. With several branches, several crossing points can be reached.
  • the guide linings 5 and 6 are each formed by a single strip 32 or 33.
  • the result is an intersection 10.
  • a guide covering 6 corresponding to FIG. 8 with branches 30 and 31 is provided.
  • the guide covering 5 is formed by a single strip 32 according to FIG. 9. This results in two crossing points 10. If two crossing points 10 are sufficient, then these can also be achieved by using strips with branches 30, 31 both as the leading covering 6 and as the leading covering, which face each other in such a way that the branches 30 , 31 cross.
  • Two crossing points 10 could also be created in that one conductive layer is formed by a circular ring 20 and the other conductive layer by a single strip 33.
  • the carrier foils 1 and 2 printed with the conductive coverings 5 and 6 and the conductor tracks 7 and 8 are glued to the spacer foil 3. No high demands are placed on the tolerance of the assignment of the upper carrier film 2 to the lower carrier film 1. This is because the protruding areas 13 permit dislocations in the directions D and E without the crossing points 10 being lost as a result.
  • the guide pads 5 and 6 touch in one or two, the three, the four or the six crossing points 10. This ensures reliable contact.
  • the distribution of the crossing points 10 in the switching chamber 4 can be varied according to requirements by a larger or smaller dimensioning of the crossing areas 12. For example, in the exemplary embodiment according to FIG.
  • the intersections 10 are closer than shown on the edge of the switching chamber 4, the distances A are chosen to be correspondingly larger. This does not involve a substantial increase in the total area of the conductive linings 5 and 6, so that the likelihood of a short circuit does not increase either.
  • leading surface 5 of each of the figures can be assigned to the leading surface 6 of every other figure.

Landscapes

  • Push-Button Switches (AREA)
  • Input From Keyboards Or The Like (AREA)
EP19840110258 1983-09-24 1984-08-29 Clavier flexible Withdrawn EP0135835A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833334708 DE3334708A1 (de) 1983-09-24 1983-09-24 Folientastatur
DE3334708 1983-09-24

Publications (1)

Publication Number Publication Date
EP0135835A2 true EP0135835A2 (fr) 1985-04-03

Family

ID=6210032

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840110258 Withdrawn EP0135835A2 (fr) 1983-09-24 1984-08-29 Clavier flexible

Country Status (3)

Country Link
EP (1) EP0135835A2 (fr)
JP (1) JPS60198021A (fr)
DE (1) DE3334708A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19529974C1 (de) * 1995-08-16 1996-10-24 Krone Ag Koppelfeld
GB2305780A (en) * 1995-09-29 1997-04-16 Alps Electric Co Ltd Membrane switch
US6926106B2 (en) * 1999-10-12 2005-08-09 Invacare Corporation Wheelchair having speed and direction control touchpad
EP2639808A1 (fr) 2012-03-16 2013-09-18 elobau GmbH & Co. KG Interrupteur Reed à faible course

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3606666A1 (de) * 1986-02-28 1987-09-03 Schoeller & Co Elektrotech Folientastschalter
DE3615742A1 (de) * 1986-05-09 1987-11-12 Schoeller & Co Elektrotech Folientastschalter
EP1936480A1 (fr) * 2006-12-22 2008-06-25 IEE INTERNATIONAL ELECTRONICS & ENGINEERING S.A. Dispositif d'entrée capacitif

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4143253A (en) * 1977-04-25 1979-03-06 Amp Incorporated Optically clear membrane switch
JPS54104580A (en) * 1978-02-03 1979-08-16 Canon Kk Thin electronic device
DE2902769C2 (de) * 1979-01-25 1982-12-09 Rudolf Schadow Gmbh, 1000 Berlin Drucktastenschalter
DE3140771C2 (de) * 1981-10-14 1983-11-24 Rudolf Schadow Gmbh, 1000 Berlin Mehrfach-Flachschalter
US4385215A (en) * 1981-11-09 1983-05-24 Eeco Incorporated Thin-membrane switch

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19529974C1 (de) * 1995-08-16 1996-10-24 Krone Ag Koppelfeld
GB2305780A (en) * 1995-09-29 1997-04-16 Alps Electric Co Ltd Membrane switch
GB2305780B (en) * 1995-09-29 1999-09-15 Alps Electric Co Ltd Sheet-like switch
US6926106B2 (en) * 1999-10-12 2005-08-09 Invacare Corporation Wheelchair having speed and direction control touchpad
EP2639808A1 (fr) 2012-03-16 2013-09-18 elobau GmbH & Co. KG Interrupteur Reed à faible course
DE102012102258A1 (de) 2012-03-16 2013-09-19 Elobau Gmbh & Co. Kg Kurzhub-Reedschaltertaster

Also Published As

Publication number Publication date
JPS60198021A (ja) 1985-10-07
DE3334708A1 (de) 1985-04-11

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

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STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn

Effective date: 19860901

RIN1 Information on inventor provided before grant (corrected)

Inventor name: HOCHGESANG, GERHARD

Inventor name: OELSCH, JUERGEN, DIPL.-ING.

Inventor name: STUERMER, BERTOLD