EP0392973A1 - Push button on printed circuit board - Google Patents
Push button on printed circuit board Download PDFInfo
- Publication number
- EP0392973A1 EP0392973A1 EP90810173A EP90810173A EP0392973A1 EP 0392973 A1 EP0392973 A1 EP 0392973A1 EP 90810173 A EP90810173 A EP 90810173A EP 90810173 A EP90810173 A EP 90810173A EP 0392973 A1 EP0392973 A1 EP 0392973A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- circuit board
- contact
- printed circuit
- snap disk
- tabs
- 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
- 239000004020 conductor Substances 0.000 claims abstract description 19
- 210000003127 knee Anatomy 0.000 claims abstract description 12
- 239000013039 cover film Substances 0.000 claims abstract description 6
- 125000006850 spacer group Chemical group 0.000 claims abstract description 4
- 238000004026 adhesive bonding Methods 0.000 claims description 2
- 238000003825 pressing Methods 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 238000005266 casting Methods 0.000 claims 1
- 239000011888 foil Substances 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
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
- H01H13/02—Details
- H01H13/26—Snap-action arrangements depending upon deformation of elastic members
- H01H13/48—Snap-action arrangements depending upon deformation of elastic members using buckling of disc springs
-
- 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
- H01H2205/00—Movable contacts
- H01H2205/016—Separate bridge contact
- H01H2205/024—Means to facilitate positioning
- H01H2205/03—Apertured plate
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2215/00—Tactile feedback
- H01H2215/034—Separate snap action
- H01H2215/036—Metallic disc
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2225/00—Switch site location
- H01H2225/012—Switch site location normally closed
Definitions
- the invention relates to a push button on printed circuit boards with an electrically conductive snap disk which is embedded in a recess in a spacer layer between a cover film and the printed circuit board coated with conductor tracks.
- Pushbuttons with snap disks are described as a membrane keyboard with a pressure point in DE-A 31 45 434. These are make contacts that short-circuit an electrical circuit when operated mechanically.
- the FR-PS 80 01600 shows various forms of foil pushbuttons, in which the partly moved conductor tracks are applied to deformable foils, and conveys the principle of an opener in the form of a spiral spring clamped in through a foil coated with a conductor track their support is lifted off on this conductor track.
- Breaker buttons have the task of interrupting circuits with a direct effect for safety reasons. They have to be characterized by a long service life and operational safety and must not cause incorrect switching due to shocks and vibrations. They are almost always used right next to closing pushbuttons. Although pushbuttons have been used as closers for several years Membrane keyboards are used, there are hardly any equivalent designs for Openers. The object of the invention is therefore to provide a pushbutton that is equivalent or better to be closed for membrane keyboards.
- the object is achieved in that the snap washer has offset contact tabs and pull tabs, in that the draw tabs are anchored to the snap disk on the circuit board under tension and in that the contact tabs form an elastic yoke, in the unactuated state they rest only on the conductor tracks and in each case between of the contact surface and the snap disk plate have a support knee curved towards the circuit board, which is supported on the printed circuit board when the snap disk is pressed down and increases the mechanical resistance, the area between the support knee and the disk plate springing elastically, the knee originally biased towards contact sliding on the circuit board Swiveling movement takes place and the end of the contact tab with its contact surface lifts off the conductor track.
- a pushbutton is shown on a printed circuit board 1 with an electrically conductive snap disk 4, which is embedded in a recess in a spacer layer 2 between a cover film 3 and the printed circuit board 1 coated with conductor tracks 7.
- the snap disk 4 has mutually offset contact tabs 5 and pull tabs 6, the draw tabs are anchored to the snap disk 4 on the printed circuit board 1 under tension and the contact tabs form an elastic yoke.
- the contact tabs 5 are pretensioned on the conductor tracks 7 and, between the contact surface 8 and the disk plate 10, have a support knee 9 curved toward the printed circuit board 1.
- the necessary actuating force When the snap disk 4 is pressed down in the actuating direction d, the necessary actuating force initially grows in an area 1 Fa and the contact force Fc until the support knee 9 is supported on the circuit board 1. Due to the shortened leverage between the support knee 9 and the disk plate 10, the necessary actuating force rises more steeply in an area II, the area between the support knee 9 and the disk plate 10 elastically deflecting, the knees originally preloaded from the contact surface 8 slidingly executing on the circuit board and the contact force Fc decreases until the contact surface 8 lifts off the conductor track 7.
- the resilient elements are dimensioned and matched to the height of the conductor track 7 in the area of the contact area 8 such that the contact areas 8 at the latest lift off when the peak value for the actuating force Fa is reached.
- the actuating force Fa initially decreases with progressive deformation in the actuating direction d until the snap disk plate is also seated on the printed circuit board and opposes substantially greater resistance, which protects the other snap disk areas from excessive stress.
- the contact force Fa in the unactuated state depends on the pretensioning of the pull tabs 6, which center the snap disk on the one hand and on the other hand are guided in a preferred embodiment through recesses 11 in the printed circuit board 1 and are latched with protruding bends on the back of the printed circuit board 1. Other mounting options respectively. Abutments result from encapsulation, gluing or pressing on the pull tabs.
- the play between the snap disk 4 and the cover sheet 3 is once in the case of negative play, i.e. Overlap, used to increase the contact force Fc in the unactuated state and, on the other hand, serves to center the actuating finger when there is positive play.
- a preferred application for the breaker buttons described is in gas refueling devices for motor vehicles.
Landscapes
- Push-Button Switches (AREA)
Abstract
Eine Drucktaste an Leiterplatten (1) mit einer elektrisch leitenden Schnappscheibe (4), die in einer Aussparung einer Distanzschicht 2 zwischen einer Abdeckfolie (3) und der mit Leiterbahnen (7) beschichteten Leiterplatte (1) eingebettet ist, wird als unterbrechertaste mit Druckpunkt ausgeführt, indem die Schnappscheibe zueinander versetzte Kontaktlappen (5) und Zuglappen (6) aufweist, die Zuglappen (6) unter Vorspannung an der Leiterplatte (1) verankert sind, um den nötigen Kontaktdruck bei Nichtbetätigung zu erzeugen, und die Kontaktlappen (5) zwischen der Kontaktfläche (8) und dem Schnappscheibenteller (10) ein zur Leiterplatte (1) gekrümmtes Abstützknie (9) aufweisen, das sich bei Betätigung der Schnappscheibe (4) auf der Leiterplatte (1) abstützt und mit zunehmender Betätigungskraft (Fa), die Kontaktfkraft (Fc) bis zum Abheben der Kontaktfläche (8) verringert. Abheben der Kontaktfläche (8) und das Durchlaufen des Druckpunktes resp. des Scheitelwertes für die Betätigungskraft (Fa) treten bei dem gleichen Deformationsweg (d) der Schnappscheibe auf. A push button on printed circuit boards (1) with an electrically conductive snap disk (4), which is embedded in a recess in a spacer layer 2 between a cover film (3) and the printed circuit board (1) coated with conductor tracks (7), is designed as an interrupter button with a pressure point , by the snap disc offset contact tabs (5) and pull tabs (6), the pull tabs (6) are anchored to the circuit board (1) under prestress to generate the necessary contact pressure when not actuated, and the contact tabs (5) between the Contact surface (8) and the snap disk plate (10) have a support knee (9) curved towards the printed circuit board (1), which is supported on the printed circuit board (1) when the snap disk (4) is actuated, and the contact force () with increasing actuating force (Fa). Fc) reduced until the contact surface (8) is lifted off. Lifting off the contact surface (8) and going through the pressure point respectively. of the peak value for the actuating force (Fa) occur with the same deformation path (d) of the snap disk.
Description
Die Erfindung bezieht sich auf eine Drucktaste an Leiterplatten mit einer elektrisch leitenden Schnappscheibe, die in einer Aussparung einer Distanzschicht zwischen einer Abdeckfolie und der mit Leiterbahnen beschichteten Leiterplatte eingebettet ist.The invention relates to a push button on printed circuit boards with an electrically conductive snap disk which is embedded in a recess in a spacer layer between a cover film and the printed circuit board coated with conductor tracks.
Drucktasten mit Schnappscheiben sind als Folientastatur mit Druckpunkt in der DE-A 31 45 434 beschrieben. Es handelt sich um Schliesser, die bei mechanischer Betätigung einen elektischen Stromkreis kurzschliessen. Im weiteren zeigt die FR-PS 80 01600 verschiedende Formen von Foliendrucktasten, bei denen die zum Teil bewegten Leiterbahnen auf deformierbaren Folien aufgebracht sind, und vermittelt das Prinzip eines Oeffners in Form einer einseitig eingespannten Biegefeder, die durch eine mit einer Leiterbahn beschichtete Folie hindurch von ihrer Auflage auf dieser Leiterbahn abgehoben wird.Pushbuttons with snap disks are described as a membrane keyboard with a pressure point in DE-A 31 45 434. These are make contacts that short-circuit an electrical circuit when operated mechanically. Furthermore, the FR-PS 80 01600 shows various forms of foil pushbuttons, in which the partly moved conductor tracks are applied to deformable foils, and conveys the principle of an opener in the form of a spiral spring clamped in through a foil coated with a conductor track their support is lifted off on this conductor track.
Unterbrechertasten haben die Aufgabe, aus Sicherheitsgründen Stromkreise direkt wirkend zu unterbrechen. Sie müssen sich durch hohe Lebensdauer und Betriebssicherheit auszeichnen und dürfen keine Fehlschaltungen wegen Stössen und Vibrationen hervorrufen. Sie sind fast immer direkt neben schliessenden Drucktasten eingesetzt. Obwohl Drucktasten als Schliesser seit einigen Jahren bei Folientastaturen angewendet werden, gibt es kaum gleichwertige Ausführungen für Oeffner. Die Erfindung hat daher die Aufgabe, einen zu schliessenden Drucktasten gleichwertigen oder besseren Oeffner für Folientastaturen zu schaffen.Breaker buttons have the task of interrupting circuits with a direct effect for safety reasons. They have to be characterized by a long service life and operational safety and must not cause incorrect switching due to shocks and vibrations. They are almost always used right next to closing pushbuttons. Although pushbuttons have been used as closers for several years Membrane keyboards are used, there are hardly any equivalent designs for Openers. The object of the invention is therefore to provide a pushbutton that is equivalent or better to be closed for membrane keyboards.
Gemäss der Erfindung wird die Aufgabe gelöst, indem die Schnappscheibe zueinander versetzte Kontaktlappen und Zuglappen aufweist, indem die Zuglappen unter Zugspannung zur Schnappscheibe an der Leiterplatte verankert sind und indem die Kontaktlappen ein elastisches Joch bilden, im unbetätigten Zustand nur auf den Leiterbahnen aufliegen und jeweils zwischen der Kontaktfläche und dem Schnappscheibenteller ein zur Leiterplatte gekrümmtes Abstützknie aufweisen, das sich beim Hinunterpressen der Schnappscheibe auf der Leiterplatte abstützt und die mechanische Widerstandskraft vergrössert, wobei der Bereich zwischen Abstützknie und Scheibenteller elastisch einfedert, das ursprünglich zum Kontakt hin vorgespannte Knie auf der Leiterplatte gleitend eine Schwenkbewegung vollzieht und das Ende des Kontaktlappens mit seiner Kontaktfläche von der Leiterbahn abhebt.According to the invention, the object is achieved in that the snap washer has offset contact tabs and pull tabs, in that the draw tabs are anchored to the snap disk on the circuit board under tension and in that the contact tabs form an elastic yoke, in the unactuated state they rest only on the conductor tracks and in each case between of the contact surface and the snap disk plate have a support knee curved towards the circuit board, which is supported on the printed circuit board when the snap disk is pressed down and increases the mechanical resistance, the area between the support knee and the disk plate springing elastically, the knee originally biased towards contact sliding on the circuit board Swiveling movement takes place and the end of the contact tab with its contact surface lifts off the conductor track.
Weitere Vorteile der Erfindung sind darin zu sehen, dass nur durch die unerschiedliche Anordnung der Leiterbahnen und durch die unterschiedlich gestalteten Schnappscheiben die Fertigung von Oeffnern und Schliessern an einer Leiterplatte im Verbund ermöglicht ist und dass dem Benutzer die gleiche taktile Rückmeldung für die Ausführung der Funktion durch Ueberschreiten eines Druckpunktes vermittelt wird.Further advantages of the invention can be seen in the fact that only the different arrangement of the conductor tracks and the differently designed snap disks make it possible to manufacture openers and closers on a printed circuit board in a network and that the user receives the same tactile feedback for the execution of the function Exceeding a pressure point is conveyed.
Im folgenden wird die Erfindung anhand von einem Ausführungsbeispiel beschrieben. Es zeigen:
- Fig. 1 einen perspektivischen Ausschnitt aus einer Leiterplatte mit einer als Oeffner ausgebildeten Drucktaste und
- Fig. 2 eine graphische Darstellung für die Abhängigkeit der Betätigungskraft und des Kontaktdruckes einer Oeffnerdrucktaste vom Deformationsweg der Schnappscheibe.
- Fig. 1 shows a perspective section of a Printed circuit board with a push button designed as an opener and
- Fig. 2 is a graphical representation of the dependence of the actuation force and the contact pressure of an open push button on the deformation path of the snap disk.
In den Figuren ist eine Drucktaste an einer Leiterplatte 1 mit einer elektrisch leitenden Schnappscheibe 4, die in einer Aussparung einer Distanzschicht 2 zwischen einer Abdeckfolie 3 und der mit Leiterbahnen 7 beschichteten Leiterplatte 1 eingebettet ist, gezeigt. Erfindungsgemäss weist die Schnappscheibe 4 zueinander versetzte Kontaktlappen 5 und Zuglappen 6 auf, sind die Zuglappen unter Zugspannung zur Schnappscheibe 4 an der Leiterplatte 1 verankert und bilden die Kontaktlappen ein elastisches Joch. Die Kontaktlappen 5 liegen im unbetätigten Zustand unter Vorspannung auf den Leiterbahnen 7 auf und besitzen zwischen der Kontaktfläche 8 und dem Scheibenteller 10 ein zur Leiterplatte 1 gekrümmtes Abstützknie 9. Beim Hinunterpressen der Schnappscheibe 4 in der Betätigungsrichtung d wächst zunächst in einem Bereich 1 die notwendige Betätigungskraft Fa und die Kontaktkraft Fc, bis das Abstützknie 9 sich auf der Leiterplatte 1 abstützt. Durch die verkürzte Hebelwirkung zwischen Abstützknie 9 und Scheibenteller 10 steigt die notwendige Betätigungskraft in einem Bereich II steiler an, wobei der Bereich zwischen Abstützknie 9 und Scheibenteller 10 elastisch einfedert, das ursprünglich von der Kontaktfläche 8 her vorgespannte Knie auf der Leiterplatte gleitend eine Schwenkbewegung vollzieht und sich die Kontaktkraft Fc bis zum Abheben der Kontaktfläche 8 von der Leiterbahn 7 verringert. Die federnden Elemente sind so dimensioniert und mit der Höhe der Leiterbahn 7 im Bereich der Kontaktfläche 8 abgestimmt, dass die Kontaktflächen 8 spätestens mit dem Erreichen des Scheitelwertes für die Betätigungskraft Fa abheben.In the figures, a pushbutton is shown on a printed
Im Bereich III sinkt die Betätigungskraft Fa zunächst mit fortschreitender Deformation in Betätigungsrichtung d bis auch der Schnappscheibenteller auf der Leiterplatte aufsitzt und wesentlich grösseren Widerstand entgegensetzt, der die übrigen Schnappscheibenbereiche vor Ueberbeanspruchung schützt. Die Kontaktkraft Fa im unbetätigten Zustand hängt von der Vorspannung der Zuglappen 6 ab, die einerseits die Schnappscheibe zentrieren und andererseits in einer bevorzugten Ausführung durch Ausnehmungen 11 in der Leiterplatte 1 geführt und mit vorstehenden Abbiegungen auf der Rückseite der Leiterplatte 1 verklinkt sind. Weitere Befestigungsmöglichkeiten resp. Widerlager ergeben sich durch Umgiessen, Ankleben oder Anpressen der Zuglappen. Das Spiel zwischen Schnappscheibe 4 und Abdeckfolie 3 wird einmal bei negativem Spiel, d.h. Ueberlappung, zur Erhöhung der Kontaktkraft Fc im unbetätigten Zustand verwendet und dient zum anderen bei positivem Spiel der Zentrierung des Betätigungsfingers. Eine bevorzugte Anwendung für die beschriebenen Unterbrechertasten besteht in Gasbetankungsgeräten für Kraftfahrzeuge.In area III, the actuating force Fa initially decreases with progressive deformation in the actuating direction d until the snap disk plate is also seated on the printed circuit board and opposes substantially greater resistance, which protects the other snap disk areas from excessive stress. The contact force Fa in the unactuated state depends on the pretensioning of the pull tabs 6, which center the snap disk on the one hand and on the other hand are guided in a preferred embodiment through
Claims (11)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH1344/89A CH677552A5 (en) | 1989-04-10 | 1989-04-10 | |
CH1344/89 | 1989-04-10 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0392973A1 true EP0392973A1 (en) | 1990-10-17 |
EP0392973B1 EP0392973B1 (en) | 1994-02-23 |
Family
ID=4208285
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90810173A Expired - Lifetime EP0392973B1 (en) | 1989-04-10 | 1990-03-07 | Push button on printed circuit board |
Country Status (7)
Country | Link |
---|---|
US (1) | US4978818A (en) |
EP (1) | EP0392973B1 (en) |
AU (1) | AU631858B2 (en) |
CA (1) | CA2014135A1 (en) |
CH (1) | CH677552A5 (en) |
DE (1) | DE59004650D1 (en) |
NZ (1) | NZ232888A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0809266A2 (en) * | 1996-05-25 | 1997-11-26 | ABBPATENT GmbH | Low tension switch device |
EP0951032A2 (en) * | 1998-04-17 | 1999-10-20 | INOVAN GmbH & Co. KG Metalle und Bauelemente | Snap disc switch having improved contact distance |
WO1999054900A1 (en) * | 1998-04-18 | 1999-10-28 | Inovan Gmbh & Co. Kg Metalle Und Bauelemente | Snap-on wafer switch with a fixing element |
FR2841037A1 (en) * | 2002-06-13 | 2003-12-19 | Itt Mfg Enterprises Inc | Push button switch normally closed having contact carriers isolating material held and conductor strip forming contact/button activated with carriers released when button pushed. |
WO2010049219A1 (en) * | 2008-10-28 | 2010-05-06 | Thales | Keypad with long key travel and improved touch feeling |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2755534B1 (en) * | 1996-11-06 | 1998-12-11 | Apem | ELECTRIC PUSH BUTTON FORMING ELEMENT |
US5898147A (en) * | 1997-10-29 | 1999-04-27 | C & K Components, Inc. | Dual tact switch assembly |
US6423918B1 (en) * | 2000-03-21 | 2002-07-23 | Lear Corporation | Dome switch |
SG100707A1 (en) * | 2000-06-07 | 2003-12-26 | Ebauchesfabrik Eta Ag | Control device with a snap function and watch fitted therewith |
TW572345U (en) * | 2003-06-23 | 2004-01-11 | Emi Stop Corp | Elastic sheet of ingle-piece circuit switch |
DE102005041029B4 (en) * | 2005-08-23 | 2007-09-06 | Prettl, Rolf | Belt buckle for seat belts |
US7700890B2 (en) * | 2008-01-15 | 2010-04-20 | Research In Motion Limited | Key dome assembly with improved tactile feedback |
DE102008063732A1 (en) * | 2008-12-18 | 2010-06-24 | Siemens Aktiengesellschaft | Membrane button for use in paging system, has contact surface contacted during actuation of contact disk with conductive strip, where strip is electrically connected with electric circuit for connection with measuring device |
KR20170022567A (en) * | 2015-08-21 | 2017-03-02 | 삼성전자주식회사 | Contact Structure and Contact device, and electronic Device including the same |
JP6689284B2 (en) * | 2015-09-30 | 2020-04-28 | アルプスアルパイン株式会社 | Push switch |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2415448A (en) * | 1942-06-05 | 1947-02-11 | Pierce John B Foundation | Snap switch |
DE3145434A1 (en) * | 1981-11-16 | 1983-05-26 | Kundisch GmbH, 7730 Villingen-Schwenningen | Film keyboard with a pressure point |
DE3226008A1 (en) * | 1982-07-12 | 1984-01-12 | Siemens AG, 1000 Berlin und 8000 München | Switching device for contacts on a support |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4163125A (en) * | 1971-06-01 | 1979-07-31 | Texas Instruments Incorporated | Pushbutton keyboard system |
BE795425A (en) * | 1972-11-20 | 1973-05-29 | Texas Instruments Inc | ADVANCED PUSH-BUTTON KEYPAD SYSTEM |
US3941964A (en) * | 1974-12-09 | 1976-03-02 | Bowmar Instrument Corporation | Push-button type binary switch device |
US3996428A (en) * | 1975-03-17 | 1976-12-07 | Litronix, Inc. | Pushbutton keyboard assembly with over center diaphragm contact |
US4029916A (en) * | 1975-04-18 | 1977-06-14 | Northern Electric Company Limited | Multi-contact push-button switch and plural embodiment for keyboard switch assembly |
US4084071A (en) * | 1976-12-06 | 1978-04-11 | Rca Corporation | Switch mechanism for a calculator type keyboard |
SU1332401A1 (en) * | 1985-06-07 | 1987-08-23 | Предприятие П/Я М-5339 | Switching device |
US4778952A (en) * | 1987-04-23 | 1988-10-18 | Eaton Corporation | Key switch assembly |
JPH0221825A (en) * | 1989-05-24 | 1990-01-24 | Iseki Foods Eng Co Ltd | Continuous steamed cooking device |
-
1989
- 1989-04-10 CH CH1344/89A patent/CH677552A5/de not_active IP Right Cessation
-
1990
- 1990-03-07 DE DE90810173T patent/DE59004650D1/en not_active Expired - Fee Related
- 1990-03-07 EP EP90810173A patent/EP0392973B1/en not_active Expired - Lifetime
- 1990-03-13 NZ NZ232888A patent/NZ232888A/en unknown
- 1990-04-06 US US07/505,846 patent/US4978818A/en not_active Expired - Fee Related
- 1990-04-09 CA CA002014135A patent/CA2014135A1/en not_active Abandoned
- 1990-04-09 AU AU52993/90A patent/AU631858B2/en not_active Ceased
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2415448A (en) * | 1942-06-05 | 1947-02-11 | Pierce John B Foundation | Snap switch |
DE3145434A1 (en) * | 1981-11-16 | 1983-05-26 | Kundisch GmbH, 7730 Villingen-Schwenningen | Film keyboard with a pressure point |
DE3226008A1 (en) * | 1982-07-12 | 1984-01-12 | Siemens AG, 1000 Berlin und 8000 München | Switching device for contacts on a support |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0809266A2 (en) * | 1996-05-25 | 1997-11-26 | ABBPATENT GmbH | Low tension switch device |
EP0809266A3 (en) * | 1996-05-25 | 1998-11-04 | ABBPATENT GmbH | Low tension switch device |
EP0951032A2 (en) * | 1998-04-17 | 1999-10-20 | INOVAN GmbH & Co. KG Metalle und Bauelemente | Snap disc switch having improved contact distance |
EP0951032A3 (en) * | 1998-04-17 | 2000-10-04 | INOVAN GmbH & Co. KG Metalle und Bauelemente | Snap disc switch having improved contact distance |
WO1999054900A1 (en) * | 1998-04-18 | 1999-10-28 | Inovan Gmbh & Co. Kg Metalle Und Bauelemente | Snap-on wafer switch with a fixing element |
DE19823894C1 (en) * | 1998-04-18 | 2000-01-05 | Inovan Stroebe | Snap disc switch with fastener |
FR2841037A1 (en) * | 2002-06-13 | 2003-12-19 | Itt Mfg Enterprises Inc | Push button switch normally closed having contact carriers isolating material held and conductor strip forming contact/button activated with carriers released when button pushed. |
WO2010049219A1 (en) * | 2008-10-28 | 2010-05-06 | Thales | Keypad with long key travel and improved touch feeling |
US8541707B2 (en) | 2008-10-28 | 2013-09-24 | Thales | Keypad with long key travel and improved touch feeling |
Also Published As
Publication number | Publication date |
---|---|
CA2014135A1 (en) | 1990-10-10 |
NZ232888A (en) | 1993-04-28 |
US4978818A (en) | 1990-12-18 |
AU5299390A (en) | 1990-10-11 |
AU631858B2 (en) | 1992-12-10 |
DE59004650D1 (en) | 1994-03-31 |
CH677552A5 (en) | 1991-05-31 |
EP0392973B1 (en) | 1994-02-23 |
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