EP0419717A1 - Clavier à feuilles - Google Patents

Clavier à feuilles Download PDF

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Publication number
EP0419717A1
EP0419717A1 EP89118053A EP89118053A EP0419717A1 EP 0419717 A1 EP0419717 A1 EP 0419717A1 EP 89118053 A EP89118053 A EP 89118053A EP 89118053 A EP89118053 A EP 89118053A EP 0419717 A1 EP0419717 A1 EP 0419717A1
Authority
EP
European Patent Office
Prior art keywords
rings
flexible
keyboard according
piezo elements
piezo
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
Application number
EP89118053A
Other languages
German (de)
English (en)
Other versions
EP0419717B1 (fr
Inventor
Gert Dipl.-Ing. Miller
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.)
Scheidt and Bachmann GmbH
Original Assignee
Scheidt and Bachmann 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 Scheidt and Bachmann GmbH filed Critical Scheidt and Bachmann GmbH
Priority to ES89118053T priority Critical patent/ES2065360T3/es
Priority to DE58908605T priority patent/DE58908605D1/de
Priority to EP89118053A priority patent/EP0419717B1/fr
Priority to AT89118053T priority patent/ATE113752T1/de
Publication of EP0419717A1 publication Critical patent/EP0419717A1/fr
Application granted granted Critical
Publication of EP0419717B1 publication Critical patent/EP0419717B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01H2201/00—Contacts
    • H01H2201/02—Piezo element
    • 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
    • H01H2205/028—Protuberances on substrate

Definitions

  • the invention relates to a keyboard with a plurality of disk-shaped piezo elements, which are arranged behind a front panel provided with key symbols between two flexible foils, which are provided for each piezo element with a contact surface which is led through a conductor track to a connector plug of the keyboard is, as well as with a rigid support plate carrying the film and the front plate for receiving the bending forces exerted on the piezo elements by pressure loading of the front plate in the area of the key symbols.
  • Such keyboards referred to as membrane keyboards, are known from EP-A 210 386. They have the advantage that they can be inexpensively manufactured due to their structure and can be adapted in a relatively simple manner to the respective intended use.
  • an intermediate foil is used to hold the piezo elements, which is provided with corresponding recesses for the individual piezo elements.
  • This intermediate film is not only an additional component, but has to be produced to fulfill its purpose with a thickness that essentially corresponds to the thickness of the respective piezo elements.
  • the invention has for its object to provide a membrane keyboard of the type described, which on the one hand has a simpler and cheaper structure and on the other hand avoids any difficulties in the assignment between piezo elements and associated conductor tracks.
  • the solution to this problem by the invention is characterized in that one of the flexible foils is provided with rings surrounding the piezo elements, the axial thickness of which corresponds approximately to the disk thickness of the piezo elements.
  • the previously required intermediate film for accommodating the piezo elements can be dispensed with, because the position of these piezo elements is predetermined by rings which are arranged on one of the flexible cover films and their axial thickness is approximately the same as the disk thickness of the piezo elements corresponds. Since the rings are arranged directly on one of the flexible foils, the difficulty of assigning several foils to one another is eliminated when assembling the foil keyboard; it is therefore ensured that the piezo elements are reliably arranged in the region of the contact surfaces of the conductor tracks which are formed on the two cover foils. In addition to a simpler and therefore less expensive structure, the invention also avoids difficulties in assigning the individual parts of the membrane keyboard according to the invention.
  • the rings are made of plastic, preferably made of plastic resins, and are applied directly to the surface of the film provided with the contact surfaces and conductor tracks, so that the production is particularly simple.
  • the rings are arranged on a flexible carrier foil and provided with at least one slot opening; this carrier foil is placed on one of the two flexible foils, which is provided with the slots corresponding to the slotted rings, contact surfaces lying within these annular recesses and the associated conductor tracks guided through the slot openings to the contact surfaces, the axial thickness of the rings being approximately the disk thickness of the Piezo elements plus the thickness of the flexible film in the area of the contact areas corresponds. Since in this embodiment according to the invention a flexible carrier film is provided with the rings used to hold the piezo elements, conventional cover films can be used.
  • the slotted rings can preferably be produced from copper by etching off a copper layer applied to the carrier foil.
  • spacers can be arranged on the surface facing the carrier plate of the flexible film or carrier film provided with the rings on the other surface. These spacers are preferably formed as rings coaxial with the rings on the other surface. If, according to a further feature of the invention, the inner diameter is supported on the carrier plate If the rings are made smaller than the inside diameter of the rings receiving the piezo elements, the piezo elements are supported in their edge area, which ensures a particularly good response behavior.
  • the rings arranged on the underside of the flexible film or the carrier film can also preferably be produced from plastic or copper.
  • the contact areas and conductor tracks are preferably made of metal powder, preferably silver, and printed on the flexible foils.
  • the rings and / or spacers are connected to one another by at least one web, as a result of which both the manufacture is simplified and the durability is improved.
  • the invention proposes to glue or weld at least some of the foils to one another and / or to the front plate or carrier plate.
  • the membrane keyboard according to the first embodiment of Figures 1 and 2 comprises a flexible front panel 1, which is provided on its visible surface with key symbols 1a.
  • This front panel 1 is only drawn to a small extent in FIGS. 1 and 2.
  • this flexible film 2 is connected to the front panel 1 by an adhesive layer 3.
  • This adhesive layer 3 can optionally be formed on the underside of the front panel 1 and / or the top of the film 2 or as a double-sided adhesive film.
  • a second flexible film 4 which is provided on its upper side with contact surfaces 4a and conductor tracks 4b. Rings 5 are applied to this top side, which are provided with the contact surfaces 4a and conductor tracks 4b, and serve to receive a piezo element 6 each.
  • a disk-shaped piezo element 6 is shown in the sectional view in FIG. 2; in the perspective view of Fig.l the piezo elements have been omitted for clarity.
  • the rings 5 used to hold the disk-shaped piezo elements 6 preferably consist of plastic resins which have been applied directly to the surface of the film 4.
  • the thickness, i.e. the axial extent of the rings 5 essentially corresponds to the thickness of the disk-like piezo elements 6, as can be seen in particular from FIG. In this illustration of FIG. 2, the contact surfaces 2a and 4a and conductor tracks 2b and 4b are shown with an exaggerated thickness for the sake of better illustration.
  • the front plate 1 and the flexible films 2 and 4 are arranged on a rigid carrier plate 7, preferably made of aluminum.
  • spacers 8 which also have the shape of rings, are arranged between this carrier plate 7 and the adjacent film 4.
  • These annular spacers 8 are formed coaxially to the rings 5 on the top of the film 4 and have an inner diameter that is smaller than the inner diameter of the rings 5. This results in an annular contact surface for the edge of the disk-shaped piezo elements 6, so that when the front panel 1 is pressed, they are bent in a targeted manner in the area of a button symbol 1a in order to emit the corresponding impulse.
  • annular spacers 8 are applied directly to the underside of the flexible film 4.
  • both the rings 5 and the spacers 8 can be connected to the membrane 2 or the carrier plate 7 on their respective free surfaces via adhesive layers 9a, 9b.
  • Figure 1 finally shows the possibility to connect at least adjacent rings 5 to one another by webs 10.
  • the membrane keyboard comprises a flexible front panel 1 with key symbols 1a and two flexible foils 2 and 4, each on the facing sides with contact surfaces 2a and 4a and conductor tracks 2b and 4b for between they are arranged piezo elements 6 are provided.
  • the entire membrane keyboard is in turn supported by a carrier plate 7, preferably made of aluminum.
  • the individual disk-shaped piezo elements 6 are each arranged within a ring 5;
  • these rings 5 are not formed on one of the two flexible films 2 or 4, but on the top of a flexible carrier film 11, which in the exemplary embodiment is in turn provided with spacers 8 on its underside, which are concentric with the rings 5, in diameter however, smaller rings are made.
  • the film 4 according to FIG. 4 is provided with cutouts 12 which are designed as circular ring sections with an inner and an outer diameter are, which is slightly smaller or slightly larger than the inner or outer diameter of the rings 5 formed on the carrier film 11.
  • cutouts 12 which are designed as circular ring sections with an inner and an outer diameter are, which is slightly smaller or slightly larger than the inner or outer diameter of the rings 5 formed on the carrier film 11.
  • each piezo element 6 is arranged between the contact surfaces 2a and 4a of the flexible foils 2 and 4 and within a ring 5 which determines its position.
  • the axial extent, ie the thickness of the rings 5 corresponds essentially to the thickness of the disk-shaped piezo elements 6 plus the thickness of the film 4. Also at this point it should be mentioned that the thickness of the contact surfaces 2a and conductor tracks 2b for better illustration is exaggerated in Fig.5.
  • pressing a button symbol 1a on the front panel 1 leads to a certain deflection of this front panel 1 and the foils 2 and 4 located underneath, and thus to a pulse output by the respective disk-shaped piezo element 6, which in this case has its edge on the annular one Spacer 8 is supported so that there is a targeted deflection of the piezo element 6.
  • the piezo element 6, which is pressurized and thereby bent, results in a deformation of the piezo crystal; the resulting electrical pulse is fed via the contact surfaces 2a and 4a interacting with it and the connected conductor tracks 2b and 4b and via a connector (not shown in the drawing) of the membrane keyboard to an electronic evaluation device connected to the membrane keyboard.

Landscapes

  • Push-Button Switches (AREA)
  • Saccharide Compounds (AREA)
  • Orthopedics, Nursing, And Contraception (AREA)
  • Input From Keyboards Or The Like (AREA)
EP89118053A 1989-09-29 1989-09-29 Clavier à feuilles Expired - Lifetime EP0419717B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
ES89118053T ES2065360T3 (es) 1989-09-29 1989-09-29 Teclado de laminas.
DE58908605T DE58908605D1 (de) 1989-09-29 1989-09-29 Folientastatur.
EP89118053A EP0419717B1 (fr) 1989-09-29 1989-09-29 Clavier à feuilles
AT89118053T ATE113752T1 (de) 1989-09-29 1989-09-29 Folientastatur.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP89118053A EP0419717B1 (fr) 1989-09-29 1989-09-29 Clavier à feuilles

Publications (2)

Publication Number Publication Date
EP0419717A1 true EP0419717A1 (fr) 1991-04-03
EP0419717B1 EP0419717B1 (fr) 1994-11-02

Family

ID=8201949

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89118053A Expired - Lifetime EP0419717B1 (fr) 1989-09-29 1989-09-29 Clavier à feuilles

Country Status (4)

Country Link
EP (1) EP0419717B1 (fr)
AT (1) ATE113752T1 (fr)
DE (1) DE58908605D1 (fr)
ES (1) ES2065360T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004043578B4 (de) * 2004-07-12 2007-11-08 Diehl Ako Stiftung & Co. Kg Bedienfeld für ein elektrisches Gerät sowie Verfahren zur Herstellung eines Bedienfelds

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0124862A2 (fr) * 1983-05-06 1984-11-14 Wilhelm Ruf KG Clavier
FR2576726A1 (fr) * 1985-01-29 1986-08-01 Samokine Georges Clavier de commande a effleurement
EP0210386A1 (fr) * 1985-07-23 1987-02-04 Dynalab Ag Clavier à couches multiplesavec des touches piezoélectriques

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0124862A2 (fr) * 1983-05-06 1984-11-14 Wilhelm Ruf KG Clavier
FR2576726A1 (fr) * 1985-01-29 1986-08-01 Samokine Georges Clavier de commande a effleurement
EP0210386A1 (fr) * 1985-07-23 1987-02-04 Dynalab Ag Clavier à couches multiplesavec des touches piezoélectriques

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004043578B4 (de) * 2004-07-12 2007-11-08 Diehl Ako Stiftung & Co. Kg Bedienfeld für ein elektrisches Gerät sowie Verfahren zur Herstellung eines Bedienfelds

Also Published As

Publication number Publication date
EP0419717B1 (fr) 1994-11-02
ATE113752T1 (de) 1994-11-15
ES2065360T3 (es) 1995-02-16
DE58908605D1 (de) 1994-12-08

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