EP0210973A1 - Push button key board - Google Patents
Push button key board Download PDFInfo
- Publication number
- EP0210973A1 EP0210973A1 EP86890151A EP86890151A EP0210973A1 EP 0210973 A1 EP0210973 A1 EP 0210973A1 EP 86890151 A EP86890151 A EP 86890151A EP 86890151 A EP86890151 A EP 86890151A EP 0210973 A1 EP0210973 A1 EP 0210973A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- switching
- button
- mat
- housing
- buttons
- 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- Withdrawn
Links
Images
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
- H01H2213/00—Venting
- H01H2213/002—Venting with external pressure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2213/00—Venting
- H01H2213/01—Venting with internal pressure of other switch sites
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2213/00—Venting
- H01H2213/01—Venting with internal pressure of other switch sites
- H01H2213/014—Accumulator chamber
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2221/00—Actuators
- H01H2221/05—Force concentrator; Actuating dimple
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2223/00—Casings
- H01H2223/002—Casings sealed
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2223/00—Casings
- H01H2223/034—Bezel
Definitions
- the invention relates to a touch dial block with a countermeasure for the push buttons guided in a push button switch mat made of elastic material, which at the points located between the push buttons on the one hand and their members, on the other hand, in a double-layered switching contacts located as pressure body reinforcements, the Switching mat in the areas around the pressure body has frustoconical bulges, which on the side facing the switching film together with cross-connection channels result in a coherent cavity system.
- the object of the invention is to create a keypad which ensures optimal protection against moisture and against damage by liquids. According to the invention this is achieved in that all the contact edges with which the button housing is seated on the switching mat are covered with sealing ribs lying in one plane and that the cavity system is connected to the interior of the button housing by ventilation openings in the switching film and congruent openings in a pressure plate carrying the switching film are.
- This embodiment has the further advantage that no electrical leakage current paths can occur, so that there is also an increased flashover resistance.
- FIG. 1 shows a cross section through a keypad, which in Fig. 2 in view and partially. is shown in several cuts.
- buttons of the keypad are designated, which are arranged in a key housing 2.
- the switching mat 3 is dimensioned such that it occupies the entire cross section of the upper part of the key housing 2, in which the key buttons 1, 1 'and 1''are guided, and thus separates the interior of the key housing 2 from the exterior.
- the key housing 2 is provided with sealing ribs 8 on all contact edges with which it rests on the switch mat 3, which ribs are designed in a cutting shape and thereby achieve a strong sealing effect.
- all sealing ribs 8 are arranged in one plane, so that there is an equal surface pressure in all parts of the switching mat 3.
- the contact points of the sealing ribs on the switching mat 3 are indicated in Fig. 2 by dotted lines 9.
- cavities result within the frustoconical arch, the volumes of which are greatly reduced when the associated key buttons are actuated, as shown in the key button 1 ′′.
- all of these cavities are interconnected by transverse channels 10 to form an entire cavity system.
- this cavity system is vented into the interior in such a way that both the switching film 5 and the counter-pressure plate 7 are provided with congruent ventilation openings 11 and 12, which the cavity system with Connect interior.
- openings in the switching mat 3 in the switching film 5 and in the counter-pressure plate 7 are designated, which serve to accommodate dowel pins, not shown, of the key housing 2, by means of which the parts 3, 5 and 7 with the housing 2 are firmly connected.
Landscapes
- Push-Button Switches (AREA)
Abstract
Description
Gegenstand der Erfindung ist ein Tastwahlblock mit einer die Gegenkräfte für die einem Tastengehäuse geführten Tastenknöpfe liefernden Schaltmatte aus elastischem Material, die an den zwischen den Tastenknöpfen einerseits und ihren Zugehörigen, in einer doppellagigen Schaltfolie angeordneten Kontakten anderseits befindlichen Stellen als Druckkörper wirkende Verstärkungen aufweist, wobei die Schaltmatte in den Bereichen rings um die Druckkörper kegelstumpfförmige Auswölbungen aufweist, die auf der der Schaltfolie zugewendeten Seite zusammen mit Querverbindungskanälen ein zusammenhängendes Hohlraumsystem ergeben.The invention relates to a touch dial block with a countermeasure for the push buttons guided in a push button switch mat made of elastic material, which at the points located between the push buttons on the one hand and their members, on the other hand, in a double-layered switching contacts located as pressure body reinforcements, the Switching mat in the areas around the pressure body has frustoconical bulges, which on the side facing the switching film together with cross-connection channels result in a coherent cavity system.
Mit der Einführung des schnurlosen Telefons ist das Problem der erhöhten Beanspruchung der Fernsprech-Handapparate aktuell geworden. Davon ist vor allem das Tastenfeld betroffen, da die Tastenknöpfe als einzige bewegliche Bestandteile auch die empfindlichsten sind. Die größte Gefahr ist hierbei die Verschmutzung und die Feuchtigkeit.With the introduction of the cordless telephone, the problem of increased demands on the telephone handsets has become topical. This affects the keypad in particular, since the key buttons are the only moving parts and are the most sensitive. The greatest danger here is pollution and moisture.
Die Erfindung hat dabei die Aufgabe gestellt, einen Tastwahlblock zu schaffen, der einen optimalen Schutz gegen Feuchtigkeit und gegen Beschädigungen durch Flüssigkeiten gewährleistet. Erfindungsgemäß wird dies dadurch erzielt, daß alle Berührungskanten, mit denen das Tastengehäuse auf der Schaltmatte aufsitzt, mit in einer Ebene liegenden Dichtrippen besetzt sind und daß das Hohlraumsystem durch Entlüftungsöffnungen der Schaltfolie und durch deckungsgleiche Öffnungen einer die Schaltfolie tragenden Gengendruckplatte mit dem Innenraum des Tastengehäuses verbunden sind. Mit dieser Ausführung ist noch der weitere Vorteil verbunden, daß keine elektrischen Kriechstromstrecken zustandekommen können, so daß auch eine erhöhte Überschlagsfestigkeit resultiert.The object of the invention is to create a keypad which ensures optimal protection against moisture and against damage by liquids. According to the invention this is achieved in that all the contact edges with which the button housing is seated on the switching mat are covered with sealing ribs lying in one plane and that the cavity system is connected to the interior of the button housing by ventilation openings in the switching film and congruent openings in a pressure plate carrying the switching film are. This embodiment has the further advantage that no electrical leakage current paths can occur, so that there is also an increased flashover resistance.
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt. Fig. 1 zeigt einen Querschnitt durch einen Tastwahlblock, der in Fig. 2 in Ansicht und z.T. in mehreren Schnitten gezeigt ist.An embodiment of the invention is shown in the drawing. Fig. 1 shows a cross section through a keypad, which in Fig. 2 in view and partially. is shown in several cuts.
Mit 1, 1' und 1'' sind drei Tastenknöpfe des Tastwahlblockes bezeichnet, die in einem Tastengehäuse 2 angeordnet sind. Die federnde Lagerung erhalten die Tasten 1, 1' und 1'' durch eine Schaltmatte 3 aus elastischem Material, die unterhalb jeder Taste 1, 1' und 1'' je eine kegelstumpförmige Aufwölbung besitzt, innerhalb der das elastische Material verstärkt ist und einen Druckkörper 4, 4' bzw. 4'' bildet. Unterhalb der Schaltmatte 3 befindet sich eine doppellagige Schaltfolie 5, innerhalb der die der Durchführung der Schaltfunktionen dienenden Koontaktteile 6, 6' an den Koppelpunkten eines Kreuzschienen-Leitungssystems angeordnet sind.With 1, 1 'and 1' 'three key buttons of the keypad are designated, which are arranged in a
Bei Drücken eines Tastknopfes werden, wie dies in Fig. 1 anhand des Tastknopfes 1'' gezeigt ist, durch den Druckkörper 4'' die entsprechenden Kontaktteile in eder Schaltfolie 5 aneinandergedrückt und der Kontakt an der zugehörigen Koppelstelle hergestellt. Zur Aufnahme des auf die Schaltfolie 5 ausgeübten Druckes dient eine Gegendruckplatte 7, die aus Hartpapier besteht.When a button is pressed, as shown in FIG. 1 with the
Die Schaltmatte 3 ist so bemessen, daß sie den ganzen Querschnitt des oberen Teiles des Tastengehäuses 2, in dem die Tastenknöpfe 1, 1' und 1'' geführt sind, einnimmt und somit den Innenraum des Tastengehäuses 2 vom Außenraum trennt. Um diese Trennung auch flüssigkeitsdicht zu gestalten, ist das Tastengehäuse 2 an allen Berührungskanten, mit denen es auf der Schaltmatte 3 aufsitzt, mit Dichtrippen 8 besetzt, die schneidenförmig ausgebildet sind und dadurch eine starke Dichtwirkung erzielen. Überdies sind alle Dichtrippen 8 in einer Ebene angeordnet, so daß sich ein gleicher Flächendruck in allen Teilen der Schaltmatte 3 ergibt.Die Auflagestellen der Dichtrippen auf der Schaltmatte 3 sind in Fig. 2 durch punktierte Linien 9 angedeutet.The switching
Zufolge der besonderen Gestaltung der Schaltmatte 3 ergeben sich innerhalb der kegelstumpfförmigen Aufwölbund Hohlräume, deren Volumina bei Betätigung der zugehörigen Tastenknöpfe, so wie bein Tastenknopf 1'' gezeigt, stark verringert werden. Um ein Ansteigen des Luftdruckes im jeweils verengten Hohlraum zuvermeiden, sind alle diese Hohlräume durch Querkanäle 10 zu einem ganzen Hohlraumsystem zusammengeschlossen. Wegen der Abdichtung des Innenraumes des Tastengehäuses 2 nach außen ist eine Entlüftung dieses Hohlraumsystems in den Innenraum vorgesehen und zwar in der Weise, daß sowohl die Schaltfolie 5 als auch die Gegendruckplatte 7 mit deckungsgleichen Entlüftungsöffnungen 11 bzw. 12 versehen sind, die das Hohlraumsystem mit dem Innenraum verbinden. Mit 13 sind deckungsgleiche, nur in Fig. 2 sichtbare Öffnungen in der Schaltmatte 3, in der Schaltfolie 5 und in der Gegendruckplatte 7 bezeichnet, die der Aufnahme von nicht dargestellten Paßstiften des Tastengehäuses 2 dienen, mittels derer die Teile 3, 5 und 7 mit dem Gehäuse 2 fest verbunden sind.As a result of the special design of the switching
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT177885A AT381814B (en) | 1985-06-14 | 1985-06-14 | KEY DIALING BLOCK |
AT1778/85 | 1985-06-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0210973A1 true EP0210973A1 (en) | 1987-02-04 |
Family
ID=3520773
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP86890151A Withdrawn EP0210973A1 (en) | 1985-06-14 | 1986-05-23 | Push button key board |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0210973A1 (en) |
AT (1) | AT381814B (en) |
FI (1) | FI862532A (en) |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0322514A2 (en) * | 1987-12-30 | 1989-07-05 | Hewlett-Packard Company | Keyboard switch system |
GB2219691A (en) * | 1988-06-13 | 1989-12-13 | Mitsubishi Electric Corp | Keyboards |
US4980522A (en) * | 1988-06-13 | 1990-12-25 | Mitsubishi Denki Kabiushiki Kaisha | Operating key switch unit |
DE9216956U1 (en) * | 1992-12-12 | 1993-02-11 | Skultety, Ivan, 50767 Köln | Keyboard switching device |
GB2260443A (en) * | 1991-10-08 | 1993-04-14 | Silitek Corp | Switch. |
GB2260444A (en) * | 1991-10-08 | 1993-04-14 | Silitek Corp | Switch |
EP0481193B1 (en) * | 1990-10-16 | 1993-10-13 | FRITZ HARTMANN GERÄTEBAU GMBH & CO KG | Miniature keyboard for electrical equipment |
GB2353251B (en) * | 1999-08-20 | 2002-03-20 | Nec Corp | Water-proof and dust-proof structure of key switch device |
GB2409576A (en) * | 2003-12-24 | 2005-06-29 | Dale Mcphee Purcocks | Keypad switch |
WO2006067507A1 (en) * | 2004-12-24 | 2006-06-29 | In2Connect Inc. | A switch |
US7409888B2 (en) * | 2002-12-09 | 2008-08-12 | Bendix Commercial Vehicle Systems, Llc | Cover for parking brake control valve button |
EP2175465A1 (en) | 2008-10-07 | 2010-04-14 | Research In Motion Limited | Sealed dome switch for mobile electronic device |
US7973255B2 (en) | 2007-01-15 | 2011-07-05 | Purcocks Dale Mcphee | Keyboards |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3676607A (en) * | 1969-11-25 | 1972-07-11 | Bell Telephone Labor Inc | Pushbutton telephone dial |
US3995126A (en) * | 1975-04-03 | 1976-11-30 | Magic Dot, Inc. | Membrane keyboard apparatus |
FR2330074A1 (en) * | 1975-10-30 | 1977-05-27 | Chomerics Inc | Plastic sheet pushbutton keyboard - has conductors and contacts on flexible folded over plastic sheet separated by sheet with holes |
DE3407380A1 (en) * | 1983-03-03 | 1984-09-06 | General Electric Co., Schenectady, N.Y. | Control display arrangement for an oven having a membrane switch |
GB2144271A (en) * | 1983-07-30 | 1985-02-27 | Casio Computer Co Ltd | Keyswitch structure |
-
1985
- 1985-06-14 AT AT177885A patent/AT381814B/en not_active IP Right Cessation
-
1986
- 1986-05-23 EP EP86890151A patent/EP0210973A1/en not_active Withdrawn
- 1986-06-13 FI FI862532A patent/FI862532A/en not_active Application Discontinuation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3676607A (en) * | 1969-11-25 | 1972-07-11 | Bell Telephone Labor Inc | Pushbutton telephone dial |
US3995126A (en) * | 1975-04-03 | 1976-11-30 | Magic Dot, Inc. | Membrane keyboard apparatus |
FR2330074A1 (en) * | 1975-10-30 | 1977-05-27 | Chomerics Inc | Plastic sheet pushbutton keyboard - has conductors and contacts on flexible folded over plastic sheet separated by sheet with holes |
DE3407380A1 (en) * | 1983-03-03 | 1984-09-06 | General Electric Co., Schenectady, N.Y. | Control display arrangement for an oven having a membrane switch |
GB2144271A (en) * | 1983-07-30 | 1985-02-27 | Casio Computer Co Ltd | Keyswitch structure |
Cited By (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0322514A2 (en) * | 1987-12-30 | 1989-07-05 | Hewlett-Packard Company | Keyboard switch system |
EP0322514A3 (en) * | 1987-12-30 | 1990-09-12 | Hewlett-Packard Company | Keyboard switch system |
GB2219691A (en) * | 1988-06-13 | 1989-12-13 | Mitsubishi Electric Corp | Keyboards |
US4980522A (en) * | 1988-06-13 | 1990-12-25 | Mitsubishi Denki Kabiushiki Kaisha | Operating key switch unit |
AU618061B2 (en) * | 1988-06-13 | 1991-12-12 | Mitsubishi Denki Kabushiki Kaisha | Operating key switch unit |
GB2219691B (en) * | 1988-06-13 | 1992-09-02 | Mitsubishi Electric Corp | Operating key switch unit |
US5274217A (en) * | 1990-10-16 | 1993-12-28 | Fritz Hartmann Geratebau GmbH & Co. KG | Keyboard having keys with different heights |
EP0481193B1 (en) * | 1990-10-16 | 1993-10-13 | FRITZ HARTMANN GERÄTEBAU GMBH & CO KG | Miniature keyboard for electrical equipment |
GB2260443A (en) * | 1991-10-08 | 1993-04-14 | Silitek Corp | Switch. |
GB2260444A (en) * | 1991-10-08 | 1993-04-14 | Silitek Corp | Switch |
DE9216956U1 (en) * | 1992-12-12 | 1993-02-11 | Skultety, Ivan, 50767 Köln | Keyboard switching device |
GB2353251B (en) * | 1999-08-20 | 2002-03-20 | Nec Corp | Water-proof and dust-proof structure of key switch device |
US6437267B1 (en) | 1999-08-20 | 2002-08-20 | Nec Corp. | Water proof and dust proof structure of key switch device |
US7409888B2 (en) * | 2002-12-09 | 2008-08-12 | Bendix Commercial Vehicle Systems, Llc | Cover for parking brake control valve button |
GB2409576B (en) * | 2003-12-24 | 2006-01-18 | Dale Mcphee Purcocks | Keyboards |
GB2409576A (en) * | 2003-12-24 | 2005-06-29 | Dale Mcphee Purcocks | Keypad switch |
US7723631B2 (en) | 2003-12-24 | 2010-05-25 | Purcocks Dale Mcphee | Keyboards |
WO2006067507A1 (en) * | 2004-12-24 | 2006-06-29 | In2Connect Inc. | A switch |
US7973255B2 (en) | 2007-01-15 | 2011-07-05 | Purcocks Dale Mcphee | Keyboards |
EP2175465A1 (en) | 2008-10-07 | 2010-04-14 | Research In Motion Limited | Sealed dome switch for mobile electronic device |
US8089017B2 (en) | 2008-10-07 | 2012-01-03 | Research In Motion Limited | Sealed dome switch for mobile electronic device |
US8507820B2 (en) | 2008-10-07 | 2013-08-13 | Research In Motion Limited | Sealed dome switch for mobile electronic device |
Also Published As
Publication number | Publication date |
---|---|
FI862532A0 (en) | 1986-06-13 |
ATA177885A (en) | 1986-04-15 |
FI862532A (en) | 1986-12-15 |
AT381814B (en) | 1986-12-10 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): CH DE LI SE |
|
17P | Request for examination filed |
Effective date: 19870424 |
|
17Q | First examination report despatched |
Effective date: 19880922 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19890203 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: FORMANEK, KARL Inventor name: BRABEC REINHARD, ING. |