EP0124862A2 - Clavier - Google Patents

Clavier Download PDF

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Publication number
EP0124862A2
EP0124862A2 EP84104903A EP84104903A EP0124862A2 EP 0124862 A2 EP0124862 A2 EP 0124862A2 EP 84104903 A EP84104903 A EP 84104903A EP 84104903 A EP84104903 A EP 84104903A EP 0124862 A2 EP0124862 A2 EP 0124862A2
Authority
EP
European Patent Office
Prior art keywords
insulation layer
intermediate insulation
switch contacts
layer
base plate
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Withdrawn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
EP84104903A
Other languages
German (de)
English (en)
Other versions
EP0124862A3 (fr
Inventor
Horst Hoffmann
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.)
Wilhelm Ruf KG
Original Assignee
Wilhelm Ruf KG
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 Wilhelm Ruf KG filed Critical Wilhelm Ruf KG
Publication of EP0124862A2 publication Critical patent/EP0124862A2/fr
Publication of EP0124862A3 publication Critical patent/EP0124862A3/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Withdrawn legal-status Critical Current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
    • H01H13/78—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 characterised by the contacts or the contact sites
    • H01H13/785—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 characterised by the contacts or the contact sites characterised by the material of the contacts, e.g. conductive polymers
    • 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
    • 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
    • H01H13/703—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 characterised by spacers between contact carrying layers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2201/00—Contacts
    • H01H2201/022—Material
    • H01H2201/026—Material non precious
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2207/00—Connections
    • H01H2207/016—Jumpers; Cross-overs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2211/00—Spacers
    • H01H2211/006—Individual areas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2227/00—Dimensions; Characteristics
    • H01H2227/002—Layer thickness
    • H01H2227/006—Spacer
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2229/00—Manufacturing
    • H01H2229/002—Screen printing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2229/00—Manufacturing
    • H01H2229/016—Selective etching
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2229/00—Manufacturing
    • H01H2229/022—Modular assembly
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2229/00—Manufacturing
    • H01H2229/034—Positioning of layers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2229/00—Manufacturing
    • H01H2229/04—Solder problems

Definitions

  • the invention relates to a keypad according to the preamble of claim 1 and to a method for producing the same according to the preamble of claim 8.
  • Such keypads are commercially available and are characterized by their flat design and low manufacturing costs.
  • a disadvantage of this known keypad is the intermediate insulation layer described in the form of a film. It must be manufactured with separate tools, correctly aligned when installing the keypad and secured against slipping during operation by special measures.
  • the object of the invention is therefore to improve the keypad of the type mentioned and the method for its production in such a way that the production is simplified and the operational reliability is increased.
  • the invention takes advantage of the fact that, in the production of keypads of the type mentioned at the outset, certain layers are in any case firmly applied to the base plate with the conductor tracks, which is done by photolithography techniques or by screen printing technology.
  • these are insulation layers in the area of interconnect bridges or crossings.
  • those insulation layers which are realized in the known keypad through the foil with openings are also applied in the invention.
  • FIG. 1 to 3 show the section of a base plate (1) made of electrically insulating material, such as hard paper or plastic, to which switch contacts (2 and 3), which form a pair of switch contacts, are applied.
  • the switch contacts (2 and 3) exist, for example from an electrically conductive carbon layer, which are applied by screen printing. In plan view, these switching contacts are usually semicircular, their mutually facing edges (12) being at a distance (7) from one another.
  • An intermediate insulation layer (4) is arranged around a pair of switch contacts (2, 3) so that it partially overlaps the two switch contacts (2 and 3) of a pair at their outer edges.
  • the intermediate insulation layer (4) thus has the shape of a disk in plan view, which has an essentially circular central recess (10), as a result of which certain areas of the switch contacts (2 and 3) are not covered and are therefore accessible from above.
  • a switching film (5) made of electrically non-conductive and flexible material now lies over the structure described so far, this switching film (5) in the region of the cutout (10) of the intermediate insulation layer (4) being an electrically conductive layer, in the following contact surface (6) called, carries.
  • This contact surface (6) can be a carbon layer, for example, which is printed on the film.
  • the diameter of the contact surface (6) is smaller than the diameter of the recess (10).
  • the switching film (5) lies on the edges of the intermediate insulation layer (4), while the contact surface (6) protrudes completely into the recess (10).
  • the intermediate insulation layer (4) serves as a spacer, also called spacer in technical jargon, and thus prevents the switch from being inadvertently closed.
  • the diameter of the contact surface (6) is larger than the diameter of the recess (10), so that the outer edges of the contact surface (6) rest on the edge of the intermediate insulation layer (4) surrounding the recess (10). This is the distance between the contact surface (6) and the switching contacts (2 and 3) is somewhat larger than in the exemplary embodiment in FIG. 1.
  • the switching contacts (2 and 3) of a pair of switching contacts are each electrically connected to a conductor track (8) or (9), as is generally known in the prior art.
  • the switch contacts in the transition area between the straight edges (12) and their circular outer contour are also beveled, as can be seen from FIG. 2 at reference number (11).
  • the respective switch is actuated in that a mechanical force is exerted on the switching film (5) in the region of a pair of switching contacts.
  • the contact surface (6) is moved so far down with sufficient force that it touches both switching contact surfaces (2 and 3), so that an electrical connection is established, which ultimately leads to the conductor tracks (8 and 9) being electrically connected to one another are connected.
  • the contact surface (6) is also flexible to a certain extent so that there is no risk of cracks or breaks.
  • FIGS. 1 and 3 A small cavity is shown in FIGS. 1 and 3 in the transition area between the outer circumference of the switch contacts (2 and 3) and the intermediate insulation layer (4). In practice, this cavity does not exist. Rather, it will be filled by the intermediate insulation layer.
  • the intermediate insulation layer (4) partially covers the switch contacts (2 and 3).
  • the recess (10) of the intermediate insulation layer (4) can also be so large that there is no such overlap.
  • the layer thickness of the intermediate insulation layer (4) must be greater in this case than the layer thickness of the switch contacts (2 and 3) so that the intermediate insulation layer (4) can fulfill its function as a spacer.
  • the intermediate insulation layer (4) made of insulating varnish is applied, preferably printed on by means of screen printing.
  • FIGS. 4 a to 4 c show print samples of a specific exemplary embodiment.
  • FIG. 4 a shows the print pattern for a first intermediate insulation layer (13) which is printed on a base plate provided with conductor tracks. This pattern has different cutouts for switch contacts and for bridges.
  • Two substantially circular cutouts (14 and 15) for switching contacts and rectangular cutouts (16 and 17) for interconnect crossings or bridges are designated by way of example, the two cutouts (16 and 17) lying exactly over sections of two interconnects which are later through a bridge should be connected.
  • a recess (19) is also provided, which leaves solder connection points free.
  • first intermediate insulation layer (13) completely covers the base plate and the conductor tracks applied thereon.
  • second intermediate insulation layer according to FIG. 4b is applied.
  • This intermediate insulation layer on the one hand forms further spacers (24 and 25) around the cutouts (14 and 15) in FIG. 4 a and on the other hand is additionally printed in areas where printed circuit bridges are later printed.
  • the section of the second insulation layer designated by reference number 26 then covers the region of the first insulation layer (13) lying between the openings (16 and 17).
  • the section of the second insulation layer designated 27 covers the section of the first insulation layer (13) that lies between the recess (17) and the recess lying to the right with FIG. 4 a.
  • the two switch contact pairs (34 and 35) are then pressed into the openings formed by the spacers (24 and 25) and the recess (14 and 15), while the section 36 the recesses (16, 17 and 20) and thus the ones lying underneath Interconnects connects.
  • FIGS. 4b and 4c Analogously to the adjustment point (18), the layers in FIGS. 4b and 4c also have corresponding adjustment points (28 and 38).
  • FIGS. 4 a and 4 b a single layer with either the shape of FIG. 4 a or the shape of FIG. 4 b can also be printed on. However, this must then be thicker than the two layers described in FIGS. 4 a and 4 b.
  • the intermediate insulation layers can also be glued on, for example by means of self-adhesive insulation layers which have the configuration of FIG. 4a or that of FIG. 4b.
  • the thickness of the intermediate insulation layer is approx. 30 ⁇ .
  • the first intermediate insulation layer (13) also serves as a "solder stop". During the later soldering process, it is prevented in a manner known per se that the solder penetrates into areas that are covered by the intermediate insulation layer.

Landscapes

  • Push-Button Switches (AREA)
  • Manufacture Of Switches (AREA)
EP84104903A 1983-05-06 1984-05-02 Clavier Withdrawn EP0124862A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833316616 DE3316616A1 (de) 1983-05-06 1983-05-06 Tastenfeld
DE3316616 1983-05-06

Publications (2)

Publication Number Publication Date
EP0124862A2 true EP0124862A2 (fr) 1984-11-14
EP0124862A3 EP0124862A3 (fr) 1986-02-05

Family

ID=6198349

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84104903A Withdrawn EP0124862A3 (fr) 1983-05-06 1984-05-02 Clavier

Country Status (3)

Country Link
EP (1) EP0124862A3 (fr)
JP (1) JPS603816A (fr)
DE (2) DE3316616A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3524138A1 (de) * 1985-07-05 1987-01-08 Siemens Ag Vorrichtung zum kontaktieren von optoelektronischen bauelementen auf leiterplatten
EP0212252A3 (fr) * 1985-08-01 1989-08-30 SCHOELLER & CO. Elektrotechnische Fabrik GmbH & Co. Procédé de fabrication d'un interrupteur à membrane et interrupteur à membrane
EP0419717A1 (fr) * 1989-09-29 1991-04-03 Scheidt & Bachmann Gmbh Clavier à feuilles
EP2006869A1 (fr) * 2007-06-22 2008-12-24 IEE INTERNATIONAL ELECTRONICS & ENGINEERING S.A. Elément de commutation sous forme de feuille

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI51715C (fi) * 1975-07-03 1977-03-10 Raimo Talikka Menetelmä ja laitteisto rauta- ja teräsvalmisteiden karkaisemisksi ja kuumasinkitsemiseksi samanaikaisesti.
US4017697A (en) * 1975-09-15 1977-04-12 Globe-Union Inc. Keyboard membrane switch having threshold force structure
DE7624175U1 (de) * 1976-07-31 1976-11-25 Wilhelm Ruf Kg, 8000 Muenchen Tastatur
DE3012717A1 (de) * 1980-04-01 1981-10-08 Wilhelm Ruf KG, 8000 München Tastenfeld
US4317013A (en) * 1980-04-09 1982-02-23 Oak Industries, Inc. Membrane switch with universal spacer means
US4367385A (en) * 1981-01-26 1983-01-04 W. H. Brady Co. Capacitance switch

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3524138A1 (de) * 1985-07-05 1987-01-08 Siemens Ag Vorrichtung zum kontaktieren von optoelektronischen bauelementen auf leiterplatten
EP0212252A3 (fr) * 1985-08-01 1989-08-30 SCHOELLER & CO. Elektrotechnische Fabrik GmbH & Co. Procédé de fabrication d'un interrupteur à membrane et interrupteur à membrane
EP0419717A1 (fr) * 1989-09-29 1991-04-03 Scheidt & Bachmann Gmbh Clavier à feuilles
EP2006869A1 (fr) * 2007-06-22 2008-12-24 IEE INTERNATIONAL ELECTRONICS & ENGINEERING S.A. Elément de commutation sous forme de feuille
WO2009000694A1 (fr) * 2007-06-22 2008-12-31 Iee International Electronics & Engineering S.A. Elément de commutation de type film

Also Published As

Publication number Publication date
JPS603816A (ja) 1985-01-10
DE8313473U1 (de) 1986-10-02
EP0124862A3 (fr) 1986-02-05
DE3316616A1 (de) 1984-11-08

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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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PUAL Search report despatched

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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: 19861006

RIN1 Information on inventor provided before grant (corrected)

Inventor name: HOFFMANN, HORST