DE3420313A1 - Method for detecting leaks present in switching films - Google Patents

Method for detecting leaks present in switching films

Info

Publication number
DE3420313A1
DE3420313A1 DE19843420313 DE3420313A DE3420313A1 DE 3420313 A1 DE3420313 A1 DE 3420313A1 DE 19843420313 DE19843420313 DE 19843420313 DE 3420313 A DE3420313 A DE 3420313A DE 3420313 A1 DE3420313 A1 DE 3420313A1
Authority
DE
Germany
Prior art keywords
air
switching
contact points
contact
leaks
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Withdrawn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
DE19843420313
Other languages
German (de)
Inventor
Franz Dipl.-Ing. Blöchl
Jürgen Reuschel
Gerd Dipl.-Ing. 4290 Bocholt Weiß
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to DE19843420313 priority Critical patent/DE3420313A1/en
Publication of DE3420313A1 publication Critical patent/DE3420313A1/en
Withdrawn legal-status Critical Current

Links

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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/40—Investigating fluid-tightness of structures by using electric means, e.g. by observing electric discharges
    • 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
    • H01H2229/00—Manufacturing
    • H01H2229/018—Testing

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Examining Or Testing Airtightness (AREA)

Abstract

The invention relates to a method for detecting leaks present in switching films, the individual contact points, which can be switched individually by actuating elements and are located in air chambers, being connected to one another by air ducts and tightly sealed against the outside. It is the object of the invention to indicate a method for checking switching films for leaks which permits simple and automatable detection of leaks in switching films. This object is achieved when plungers are pressed sequentially in time onto the contact points onto the switching film (1) in such a way that these plungers remain in this position, the contacts closing, when the air present between the contact points is sequentially pressed into the air chamber of the last contact point, and when a leaky switching film can be detected if contact is made in the last air chamber. <IMAGE>

Description

Verfahren zur Erkennung von in Schaltfolien vorhandenenProcess for the detection of those present in switching foils

Undichtigkeiten Die Erfindung betrifft ein Verfahren zur Erkennung von in Schaltfolien vorhandenen Undichtigkeiten, wobei die einzelnen durch Betätigungsglieder schaltbaren in Luftkammern befindlichen Kontaktstellen untereinander durch Luftkanäle verbunden und nach außen hin dicht abgeschlossen sind.Leaks The invention relates to a method for detection of leaks present in switching foils, the individual being actuated by actuators switchable contact points located in air chambers with one another through air ducts connected and sealed to the outside.

Schaltfolien müssen aus funktions- und klimatischen Gründen dicht sein, d.h., die Luft in den durch Luftkanäle untereinander verbundenen Kontaktstellen darf auch in den Fall nicht entweichen, wenn gleichzeitig mehrere Kontaktstellen betätigt werden. Bleiben hingegen nach dem Betätigen der Drucktasten die Kontakte geschlossen, so führt dies zum Funktionsausfall bzw. zum Totalausfall der Schaltfolie und somit auch der Tastatur.Switching foils must be tight for functional and climatic reasons i.e. the air in the contact points that are interconnected by air ducts must not escape even if there are several contact points at the same time be operated. On the other hand, the contacts remain after the pushbuttons are pressed closed, this leads to a functional failure or a total failure of the switching membrane and thus also the keyboard.

Bisher ließen sich Undichtigkeiten bei Schaltfolien nur durch langwierige und teure Klimauntersuchungen, Tests in Unterdruck- oder Druckkammern oder schwierige Fingertestmethoden durchführen.Up to now, leaks in switching foils could only be solved by lengthy ones and expensive climatic studies, tests in negative or pressure chambers or difficult Perform finger test methods.

Aufgabe der Erfindung ist es, ein Verfahren zur Dichtigkeitsprüfung von Schaltfolien aufzuzeigen, das eine einfache und automatisierbare Erkennung von Undichtigkeiten bei Schaltfolien ermöglicht.The object of the invention is to provide a method for leak testing of switching foils to show that a simple and automatable detection of Allows leaks in switching foils.

Die Aufgabe wird gemäß der Erfindung dadurch gelöst, daß auf die Kontaktstellen zeitlich nacheinander Druckstößel derart auf die Schaltfolie gepreßt werden, daß diese Druckstößel in dieser Stellung verbleiben, wobei sich die Kontakte schließen, daß die zwischen den Kontaktstellen vorhandene Luft nacheinander in die Luftkammer der letzten Kontaktstelle gepreßt wird und daß eine undichte Schaltfolie dadurch erkennbar ist, wenn eine Kontaktgabe in der letzten Luftkammer erfolgt.The object is achieved according to the invention in that on the contact points one after the other pressure tappets in such a way on the switching membrane be pressed that this pressure ram remain in this position, with the contacts close that the air present between the contact points one after the other is pressed into the air chamber of the last contact point and that a leaky switching membrane it can thus be recognized when contact is made in the last air chamber.

Durch dieses Verfahren lassen sich Schaltfolien serienmäßig und rationell auf Dichtigkeit prüfen, wobei als weiterer Vorteil die Wiederholbarkeit dieses Verfahrens angesehen werden muß.With this process, switching foils can be used in series and efficiently Check for leaks. Another advantage is the repeatability of this process must be viewed.

Das erfindungsgemäße Verfahren soll im folgenden näher erläutert werden.The method according to the invention will be explained in more detail below.

In der Abbildung ist eine Schaltfolie 1 mit vier von mehreren Kontaktstellen dargestellt, die untereinander durch Luftkanäle 2 verbunden sind. Die Kontaktstellen, die jeweils Luftkammern 3, 4, 5 und 6 besitzen, sowie die Luftkanäle 2, sind nach außen luftdicht abgeschlossen.In the figure is a switching foil 1 with four of several contact points shown, which are connected to one another by air ducts 2. The contact points, which each have air chambers 3, 4, 5 and 6, as well as the air ducts 2, are according to hermetically sealed on the outside.

Mittels einer Prüfvorrichtung soll die Schaltfolie 1 auf Dichtigkeit geprüft werden. Zu diesem Zweck besitzt die Prüfvorrichtung eine der Anzahl der zu prüfenden Luftkammern 3, 4, 5 und 6 entsprechende Anzahl von Druckstößeln 7, 8, 9 und 10, die in ihrem Aufsetzbereich elastische Teller aufweisen und so gesteuert werden, daß sie in der Pfeilrichtung A zeitlich nacheinander betätigt werden. Dadurch wird die in den Luftkammern der Kontaktstellen befindliche Luft jeweils in die nachfolgenden Luftkammern gedrückt, wobei bei niedergedrücktem Druckstößel eine registrierbare Kontaktgabe erfolgt. Wird z.B.The switching foil 1 is intended to be leak-proof by means of a test device being checked. For this purpose, the test device has one of the number of air chambers to be tested 3, 4, 5 and 6 corresponding number of pressure tappets 7, 8, 9 and 10, which have elastic plates in their contact area and are controlled in this way be that they are operated one after the other in the direction of arrow A. Through this the air in the air chambers of the contact points is transferred to the following Air chambers pressed, with a recordable when the plunger is depressed Contact is made. If e.g.

der Druckstößel 7 niedergedrückt, so entweicht die in der Luftkammer 3 befindliche Luft in die Luftkammer 4, 5 und 6. Dieser Druckstößel 7 verbleibt im weiteren Verlauf der Prüfung in der niedergedrückten Stellung, während durch den Druckstößel 8 die Luft aus der Luftkammer 4 in die Luftkammern 5 und 6 verdrängt wird. Auf ähnliche Weise wird die Luft aus der Luftkammer 5 durch den Druckstoßel 9 in die Luftkammer 6 verdrängt. Bei Dichtigkeit der Schaltfolie 1 und entsprechenden Einstellung der auf die Druckstößel 7, 8 und 9 einwirkenden Druckkraft ist aufgrund des hohen Luftdruckes in der Luftkammer 6 eine Kontaktierung der in der Luftkammer 6 angeordneten Kontaktstellen nicht mehr möglich.the plunger 7 is depressed, so escapes in the Air chamber 3 located air in the air chamber 4, 5 and 6. This plunger 7 remains in the further course of the test in the depressed position while through the pressure plunger 8 displaces the air from the air chamber 4 into the air chambers 5 and 6 will. In a similar way, the air is released from the air chamber 5 by the pressure ram 9 displaced into the air chamber 6. If the switching foil 1 and the corresponding Adjustment of the pressure force acting on the pressure tappets 7, 8 and 9 is due to the high air pressure in the air chamber 6 a contact in the air chamber 6 arranged contact points are no longer possible.

Es besteht auch die Möglichkeit, die auf die Druckstößel einwirkende Druckkraft so zu bemessen, daß bei Dichtigkeit der Schaltfolie und niedergedrückten Druckstößeln 7, 8, 9 bei einer Kontaktgabe in der Luftkammer 6 durch den Druckstößel 10 einer der Druckstößel 7, 8 und 9 so weit angehoben wird, daß die Kontaktgabe in der betreffenden, dem Druckstößel zugeordneten Luftkammer unterbrochen wird.There is also the possibility of the one acting on the pressure tappet Compressive force to be dimensioned so that with tightness of the switching membrane and depressed Pressure plungers 7, 8, 9 when contact is made in the air chamber 6 by the pressure plunger 10 one of the plungers 7, 8 and 9 is raised so far that the contact is made is interrupted in the relevant air chamber assigned to the pressure tappet.

1 Patentanspruch 1 Figur Bezuqszeichenliste 1 Schaltfolie 2 Luftkanäle 3 4 Luftkammern der Kontaktstellen 5 6 7 8 Druckstößel 9 Druckstößel 10 11 12: elastische Teller 14 - Leerseite -1 claim 1 figure Bezuqszeichenliste 1 switching foil 2 air ducts 3 4 air chambers at the contact points 5 6th 7th 8 pressure tappets 9 pressure tappets 10 11 12: elastic plate 14th - blank page -

Claims (1)

Patentanspruch Verfahren zur Erkennung von in Schaltfolien vorhandenen Undichtigkeiten, wobei die einzelnen durch Betätigungsglieder schaltbaren in Luftkammern befindlichen Kontaktstellen untereinander durch Luftkanäle verbunden und nach außen hin dicht abgeschlossen sind, dadurch gekennzeichnet, daß auf die Kontaktstellen zeitlich nacheinander Druckstößel (7, 8, 9, 10) derart auf die Schaltfolie (1) gepreßt werden, daß diese Druckstößel in dieser Stellung verbleiben, wobei sich die Kontakte schließen, daß die zwischen den Kontaktstellen vorhandene Luft nacheinander in die Luftkammer der letzten Kontaktstelle gepreßt wird, und daß eine undichte Schaltfolie (1) dadurch erkennbar ist, wenn eine Kontaktgabe in der letzten Luftkammer erfolgt.Method for the detection of existing in switching foils Leaks, with the individual switchable by actuators in air chambers located contact points are connected to each other by air ducts and to the outside are closed tightly, characterized in that on the contact points successively in time pressure tappets (7, 8, 9, 10) pressed onto the switching membrane (1) in this way be that these plungers remain in this position, with the contacts conclude that the air present between the contact points successively into the Air chamber of the last contact point is pressed, and that a leaky switching membrane (1) can be recognized when contact is made in the last air chamber.
DE19843420313 1984-05-30 1984-05-30 Method for detecting leaks present in switching films Withdrawn DE3420313A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19843420313 DE3420313A1 (en) 1984-05-30 1984-05-30 Method for detecting leaks present in switching films

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19843420313 DE3420313A1 (en) 1984-05-30 1984-05-30 Method for detecting leaks present in switching films

Publications (1)

Publication Number Publication Date
DE3420313A1 true DE3420313A1 (en) 1985-12-05

Family

ID=6237299

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19843420313 Withdrawn DE3420313A1 (en) 1984-05-30 1984-05-30 Method for detecting leaks present in switching films

Country Status (1)

Country Link
DE (1) DE3420313A1 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1927550A1 (en) * 1968-07-13 1970-01-15 Sacofgas Spa Machine for checking airtight containers
DE3235656C1 (en) * 1982-09-27 1983-11-24 Siemens AG, 1000 Berlin und 8000 München Method for detecting leaks in encapsulated relay contacts

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1927550A1 (en) * 1968-07-13 1970-01-15 Sacofgas Spa Machine for checking airtight containers
DE3235656C1 (en) * 1982-09-27 1983-11-24 Siemens AG, 1000 Berlin und 8000 München Method for detecting leaks in encapsulated relay contacts

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