EP0795882B1 - Push-button switch - Google Patents

Push-button switch Download PDF

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Publication number
EP0795882B1
EP0795882B1 EP97100758A EP97100758A EP0795882B1 EP 0795882 B1 EP0795882 B1 EP 0795882B1 EP 97100758 A EP97100758 A EP 97100758A EP 97100758 A EP97100758 A EP 97100758A EP 0795882 B1 EP0795882 B1 EP 0795882B1
Authority
EP
European Patent Office
Prior art keywords
key
push
button switch
carrier
filter layer
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.)
Expired - Lifetime
Application number
EP97100758A
Other languages
German (de)
French (fr)
Other versions
EP0795882A3 (en
EP0795882A2 (en
Inventor
Gerhard Hochgesang
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.)
Preh GmbH
Original Assignee
Preh 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 Preh GmbH filed Critical Preh GmbH
Publication of EP0795882A2 publication Critical patent/EP0795882A2/en
Publication of EP0795882A3 publication Critical patent/EP0795882A3/en
Application granted granted Critical
Publication of EP0795882B1 publication Critical patent/EP0795882B1/en
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
    • 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
    • H01H13/82—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 contact space venting means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2213/00—Venting
    • H01H2213/002—Venting with external pressure
    • H01H2213/004—Scavenger; Filter

Definitions

  • the invention relates to a key switch according to the preamble of claim 1.
  • Such Find pushbuttons individually or multiple next to each other as a keypad Use within control panels or with input keyboards.
  • a dome-shaped key cap is arranged above the actuating element of the key switch, which can be designed as a mat for keypads.
  • Ventilation of the switching chambers inside the probe caps when pressed in the key cap is mandatory. This can occur through direct air leakage the atmosphere or through ventilation in other switchgear chambers under pressure equalization respectively.
  • a key switch which has a switching chamber under a key cap has, the switching chamber ver through several holes with the atmosphere is bound.
  • the switching chamber is encased in a housing, which is on the circumference Has sealant. This sealant can also act as a dust filter.
  • the object of the invention is to design a specified push button switch so that ingress of dust and moisture is prevented.
  • each switching chamber is separately ventilated to the outside takes place no influence on the operating forces.
  • the switching system is also contaminated prevented.
  • the only figure shows a stylized button switch in section.
  • the drawing shows schematically a key switch 1 with a dome-shaped key cap 2, which are pressed by a key, not shown, onto a contact foil 3 can and short-circuits 4 contacts with a contact pill.
  • the key switch 1 can be part of a key field consisting of many key switches be, the key cap 2 then consisting of a so-called key mat 5.
  • a Switching chamber 6 existing under the key cap 2 is through a ventilation duct 7 connected to the atmosphere so that the air in the switching chamber 6 at can flow out of the actuation and can flow back in again.
  • the ventilation channel 7 is an air-permeable Has filter layer 8 so that dust and moisture no longer in the switching chamber 6 can enter or be sucked.
  • the ventilation channel 7 through openings 9, 10 of the contact film 3 and a carrier 11 is formed, wherein between the contact sheet 3 and the carrier 11 the filter layer 8 forming filter fleece 12 is arranged.
  • each Switching chamber has its own ventilation duct.
  • switching chambers 6 have one in one of several keycaps 2 key cap mat 5 arranged connecting channel (not shown) are connected to the ventilation duct 7.
  • This allows several Breakthroughs 9, 10 in the contact film 3 or the carrier 11 are eliminated.
  • the between the contact sheet 3 and the carrier 11, the filter layer 8 or the filter fleece 12 is advantageously dust and moisture resistant. It preferably has one Thickness between 0.15 mm and 0.5 mm, preferably 0.2 mm.
  • the push button switch 1 in particular as part of a keypad 5 easy to operate by venting the switching chamber 6.
  • the air exchanged is freed of dust and moisture by the filter layer 8, 12, so that none Contamination of the contacts and the contact pill 4 can occur.
  • the proposed design can be advantageously used in large series production produce.

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  • Push-Button Switches (AREA)
  • Input From Keyboards Or The Like (AREA)

Description

Die Erfindung betrifft einen Tastschalter nach dem Oberbegriff des Patentanspruchs 1. Solche Tastschalter einzeln oder mehrfach nebeneinander als Tastenfeld angeordnet, finden Anwendung innerhalb von Schalttafeln oder bei Eingabetastaturen.The invention relates to a key switch according to the preamble of claim 1. Such Find pushbuttons individually or multiple next to each other as a keypad Use within control panels or with input keyboards.

Über dem Betätigungsglied des Tastschalters ist eine domförmige Tastenkappe angeordnet, die bei Tastenfeldem als Matte ausgestaltet sein kann. Bei diesen Tastenkappen ist eine Beund Entlüftung der innerhalb der Tastkappen bestehenden Schaltkammem beim Hereindrücken der Tastenkappe zwingend erforderlich. Dies kann durch direkten Austritt der Luft in die Atmosphäre oder durch eine Be- und Entlüftung in andere Schaltkammern unter Druckausgleich erfolgen.A dome-shaped key cap is arranged above the actuating element of the key switch, which can be designed as a mat for keypads. There is a problem with these keycaps Ventilation of the switching chambers inside the probe caps when pressed in the key cap is mandatory. This can occur through direct air leakage the atmosphere or through ventilation in other switchgear chambers under pressure equalization respectively.

Einen solchen Tastschalter beschreibt die DE-38 09 770 C2. Der Nachteil dieses Systems ist, daß bei direktem Austritt der Luft in die Atmosphäre durch den folgenden Ansaugeffekt Staub und Feuchtigkeit in die Schaltkammern eingezogen werden. Erfolgt dagegen die Beund Entlüftung in die anderen Schaltkammern hinein, kann kein Staub und keine Feuchtigkeit eindringen. Jedoch wird durch das Auftreten der Luftpolster und damit verbunden einer Druckänderung die Betätigungskraft des Tastschalters in dieser Schaltkammer verändert, so daß es zu Fehltastungen führen kann.DE-38 09 770 C2 describes such a push-button switch. The disadvantage of this system is that with direct escape of air into the atmosphere through the following suction effect Dust and moisture are drawn into the interrupters. On the other hand, the diagnosis is made Venting into the other interrupters, there can be no dust and no moisture penetration. However, the appearance of the air cushion and associated with it Change in pressure changes the actuating force of the key switch in this switching chamber, so that it can lead to misfiring.

Eine Folientastatur mit Schnappscheiben beschreibt die DE 42 12 562 A1. Zur Be- und Entlüftung beim Tasten befinden sich neben den Drucktasten Belüftungslöcher. Die Luft unter den Schnappscheiben wird nicht abgeführt, sondern wirkt dort als Luftfeder zur Erzeugung einer Rückstellkraft.DE 42 12 562 A1 describes a membrane keyboard with snap disks. For ventilation ventilation holes are located next to the pushbuttons. The air under the snap disks are not removed, but act there as an air spring for generation a restoring force.

Aus der US 4,453,061 ist ein Tastschalter bekannt, der eine Schaltkammer unter einer Tastenkappe besitzt, wobei die Schaltkammer über mehrere Löcher mit der Atmosphäre ver bunden ist. Die Schaltkammer wird von einem Gehäuse umhüllt, welches umfangsseitig ein Dichtmittel aufweist. Dieses Dichtmittel kann auch als Staubfilter fungieren.From US 4,453,061 a key switch is known, which has a switching chamber under a key cap has, the switching chamber ver through several holes with the atmosphere is bound. The switching chamber is encased in a housing, which is on the circumference Has sealant. This sealant can also act as a dust filter.

Die Aufgabe der Erfindung besteht darin, einen angegebenen Tastschalter so zu gestalten, daß ein Eindringen von Staub und Feuchtigkeit verhindert wird.The object of the invention is to design a specified push button switch so that ingress of dust and moisture is prevented.

Gelöst wird die Aufgabe durch die im kennzeichnenden Teil des Patentanspruchs 1 enthaltenen Merkmale. The problem is solved by the contained in the characterizing part of claim 1 Characteristics.

Dadurch, daß jede Schaltkammer getrennt nach außen be- und entlüftet wird, erfolgt keine Beeinflussung der Betätigungskräfte. Auch wird eine Verschmutzung des Schaltsystems verhindert.The fact that each switching chamber is separately ventilated to the outside takes place no influence on the operating forces. The switching system is also contaminated prevented.

Vorteilhafte Ausführungen sind in den Unteransprüchen enthalten.Advantageous designs are contained in the subclaims.

Die erfinderische Lösung soll anhand eines Ausführungsbeispieles mit Zeichnung näher erläutert werden.The inventive solution should be based on an embodiment with drawing are explained.

Es zeigt die einzige Figur einen stilisierten Tastschalter im Schnitt.The only figure shows a stylized button switch in section.

Die Zeichnung zeigt schematisch einen Tastschalter 1 mit einer domförmigen Tastenkappe 2, die von einer nicht dargestellten Taste auf eine Kontaktfolie 3 gedrückt werden kann und dabei mit einer Kontaktpille 4 Kontakte kurzschließt.The drawing shows schematically a key switch 1 with a dome-shaped key cap 2, which are pressed by a key, not shown, onto a contact foil 3 can and short-circuits 4 contacts with a contact pill.

Der Tastschalter 1 kann Teil eines aus vielen Tastschaltern bestehenden Tastenfeldes sein, wobei dann die Tastenkappe 2 auf einer sogenannten Tastenmatte 5 besteht. Eine unter der Tastenkappe 2 bestehende Schaltkammer 6 ist durch einen Belüftungskanal 7 mit der Atmosphäre verbunden, so daß die in der Schaltkammer 6 befindliche Luft bei der Betätigung ausströmen und wieder hineinströmen kann.The key switch 1 can be part of a key field consisting of many key switches be, the key cap 2 then consisting of a so-called key mat 5. A Switching chamber 6 existing under the key cap 2 is through a ventilation duct 7 connected to the atmosphere so that the air in the switching chamber 6 at can flow out of the actuation and can flow back in again.

Erfindungsgenäß ist nun vorgesehen, daß der Belüftungskanal 7 eine luftdurchlässige Filterschicht 8 aufweist, so daß Staub und Feuchtigkeit nicht mehr in die Schaltkammer 6 eintreten bzw. gesaugt werden kann.According to the invention it is now provided that the ventilation channel 7 is an air-permeable Has filter layer 8 so that dust and moisture no longer in the switching chamber 6 can enter or be sucked.

Es ist vorgesehen, daß der Belüftungskanal 7 durch Durchbrüche 9, 10 der Kontaktfolie 3 sowie eines Trägers 11 gebildet ist, wobei zwischen Kontaktfolie 3 und Träger 11 ein die Filterschicht 8 bildendes Filtervlies 12 angeordnet ist.It is provided that the ventilation channel 7 through openings 9, 10 of the contact film 3 and a carrier 11 is formed, wherein between the contact sheet 3 and the carrier 11 the filter layer 8 forming filter fleece 12 is arranged.

Wie der Zeichnung entnehmbar ist, ist vorgesehen, daß die Durchbrüche 9, 10 der Kontaktfolie 3 und des Trägers 11 im Bereich der Schaltkammer 6 bestehen, d. h. jede Schaltkammer einen eigenen Belüftungskanal aufweist. As can be seen from the drawing, it is provided that the openings 9, 10 of the Contact film 3 and the carrier 11 exist in the area of the switching chamber 6, d. H. each Switching chamber has its own ventilation duct.

Alternativ hierzu kann es vorteilhaft sein, insbesondere bei eng zusammenliegenden Schaltkammern, wenn mehrere Schaltkammern 6 über einen in einer mehrere Tastenkappen 2 aufweisenden Tastenkappenmatte 5 angeordneten Verbindungskanal (nicht dargestellt) mit dem Belüftungskanal 7 verbunden sind. Hierdurch können mehrere Durchbrüche 9, 10 in der Kontaktfolie 3 bzw. dem Träger 11 entfallen. Die zwischen der Kontaktfolie 3 und dem Träger 11 befindliche Filterschicht 8 bzw. das Filtervlies 12 ist vorteilhafterweise staub- und feuchtigkeitsabweisend. Es besitzt vorzugsweise eine Dicke zwischen 0,15 mm und 0,5 mm, vorzugsweise von 0,2 mm.As an alternative to this, it can be advantageous, in particular in the case of closely lying ones Switching chambers, if several switching chambers 6 have one in one of several keycaps 2 key cap mat 5 arranged connecting channel (not shown) are connected to the ventilation duct 7. This allows several Breakthroughs 9, 10 in the contact film 3 or the carrier 11 are eliminated. The between the contact sheet 3 and the carrier 11, the filter layer 8 or the filter fleece 12 is advantageously dust and moisture resistant. It preferably has one Thickness between 0.15 mm and 0.5 mm, preferably 0.2 mm.

Der erfindungsgemäß Tastschalter 1, insbesondere als Teil eines Tastenfeldes 5 ist durch Entlüftung der Schaltkammer 6 leicht zu betätigen. Die dabei ausgetauschte Luft wird durch die Filterschicht 8, 12 von Staub und Feuchtigkeit befreit, so daß keine Verschmutzung der Kontakte und der Kontaktpille 4 eintreten kann.The push button switch 1 according to the invention, in particular as part of a keypad 5 easy to operate by venting the switching chamber 6. The air exchanged is freed of dust and moisture by the filter layer 8, 12, so that none Contamination of the contacts and the contact pill 4 can occur.

Die vorgeschlagene Ausführung läßt sich vorteilhaft in einer Großserienfertigung herstellen.The proposed design can be advantageously used in large series production produce.

Claims (4)

  1. Push-button switch having a dome-shaped key top which is pressed by a key onto a contact foil and by means of a contact pellet short-circuits contacts, the switching chamber that exists underneath the key top being connected to the atmosphere by way of a ventilation channel, characterised in that the ventilation channel (7) has an air-permeable filter layer (8), and the ventilation channel (7) is formed by openings (9, 10) in the contact foil (3) and also in a carrier (11), the filter layer (8) being arranged between the contact foil (3) and the carrier (11).
  2. Push-button switch according to claim 1, characterised in that the filter layer (8) is formed from a non-woven filter fabric (12) which is, moreover, dust- and moisture-repellent.
  3. Push-button switch according to claim 1 or 2, characterised in that a plurality of switching chambers (6) are connected to the ventilation channel (7) by way of a connecting channel in a key-top mat (5) which has a plurality of key tops (2).
  4. Key mat having a plurality of push-button switches according to claim 3, characterised in that the openings (9, 10) in the contact foil (3) and in the carrier (11) are present in each switching chamber (6) and thus form a plurality of ventilation channels (7).
EP97100758A 1996-03-07 1997-01-18 Push-button switch Expired - Lifetime EP0795882B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19608773 1996-03-07
DE19608773A DE19608773C2 (en) 1996-03-07 1996-03-07 Safety mat

Publications (3)

Publication Number Publication Date
EP0795882A2 EP0795882A2 (en) 1997-09-17
EP0795882A3 EP0795882A3 (en) 1999-01-20
EP0795882B1 true EP0795882B1 (en) 2004-03-17

Family

ID=7787463

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97100758A Expired - Lifetime EP0795882B1 (en) 1996-03-07 1997-01-18 Push-button switch

Country Status (4)

Country Link
US (1) US5874700A (en)
EP (1) EP0795882B1 (en)
DE (2) DE19608773C2 (en)
ES (1) ES2214561T3 (en)

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WO2016183498A1 (en) 2015-05-13 2016-11-17 Apple Inc. Low-travel key mechanism for an input device
US9997304B2 (en) 2015-05-13 2018-06-12 Apple Inc. Uniform illumination of keys
WO2016183510A1 (en) 2015-05-13 2016-11-17 Knopf Eric A Keyboard for electronic device
US9934915B2 (en) 2015-06-10 2018-04-03 Apple Inc. Reduced layer keyboard stack-up
US9971084B2 (en) 2015-09-28 2018-05-15 Apple Inc. Illumination structure for uniform illumination of keys
US10353485B1 (en) 2016-07-27 2019-07-16 Apple Inc. Multifunction input device with an embedded capacitive sensing layer
US10115544B2 (en) 2016-08-08 2018-10-30 Apple Inc. Singulated keyboard assemblies and methods for assembling a keyboard
US10755877B1 (en) 2016-08-29 2020-08-25 Apple Inc. Keyboard for an electronic device
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Also Published As

Publication number Publication date
ES2214561T3 (en) 2004-09-16
DE59711404D1 (en) 2004-04-22
EP0795882A3 (en) 1999-01-20
DE19608773A1 (en) 1997-09-11
EP0795882A2 (en) 1997-09-17
US5874700A (en) 1999-02-23
DE19608773C2 (en) 1998-11-26

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