EP0795882A2 - Push-button switch - Google Patents

Push-button switch Download PDF

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Publication number
EP0795882A2
EP0795882A2 EP97100758A EP97100758A EP0795882A2 EP 0795882 A2 EP0795882 A2 EP 0795882A2 EP 97100758 A EP97100758 A EP 97100758A EP 97100758 A EP97100758 A EP 97100758A EP 0795882 A2 EP0795882 A2 EP 0795882A2
Authority
EP
European Patent Office
Prior art keywords
contact
push button
carrier
switch according
button switch
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
Application number
EP97100758A
Other languages
German (de)
French (fr)
Other versions
EP0795882B1 (en
EP0795882A3 (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 key switches arranged one or more times next to each other as a keypad are used within control panels or for 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 key fields.
  • ventilation of the switching chambers inside the keycaps is absolutely necessary when the keycap is pressed in. This can be done by directly exiting the air into the atmosphere or by ventilating into other switching chambers under pressure equalization.
  • the object of the invention is to design a specified push button switch so that the ingress of dust and moisture is prevented.
  • each switching chamber is separately ventilated to the outside, there is no influence on the actuation forces. Contamination of the switching system is also prevented.
  • the only figure shows a stylized button switch in section.
  • the drawing schematically shows a key switch 1 with a dome-shaped key cap 2, which can be pressed onto a contact foil 3 by a key (not shown) and thereby short-circuits 4 contacts with a contact pill.
  • the key switch 1 can be part of a keypad consisting of many key switches, the key cap 2 then consisting of a so-called key mat 5.
  • An existing under the key cap 2 switching chamber 6 is connected to the atmosphere through a ventilation channel 7, so that the air in the switching chamber 6 can flow out during operation and flow back in again.
  • the ventilation channel 7 has an air-permeable filter layer 8, so that dust and moisture can no longer enter or be sucked into the switching chamber 6.
  • the ventilation channel 7 is formed by openings 9, 10 of the contact film 3 and a carrier 11, a filter fleece 12 forming the filter layer 8 being arranged between the contact film 3 and the carrier 11.
  • each switching chamber has its own ventilation channel.
  • a plurality of switching chambers 6 are connected to the ventilation channel 7 via a connecting channel (not shown) arranged in a key cap mat 5 having a plurality of key caps 2.
  • a connecting channel (not shown) arranged in a key cap mat 5 having a plurality of key caps 2.
  • several openings 9, 10 in the contact film 3 or the carrier 11 can be omitted.
  • the filter layer 8 or the filter fleece 12 located between the contact film 3 and the carrier 11 is advantageously dust and moisture repellent. It preferably has a 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, is 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 no contamination of the contacts and the contact pill 4 can occur.
  • the proposed embodiment can advantageously be produced in large series.

Landscapes

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

Abstract

The membrane switch has push button cap (2) formed in an elastic material and on the inner surface of the cap is a contact element (4). When finger pressure is applied the contact is pressed against a contact foil (3). The contact foil is formed on a porous filter mat (8) on a base plate (11). The base plate and the contact foil have ventilation holes (7,9) to allow air to be expelled when the push button is pressed.

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 key switches arranged one or more times next to each other as a keypad are used within control panels or for input keyboards.

Über dem Betätigungsglied des Tastschalters ist eine domförmige Tastenkappe angeordnet, die bei Tastenfeldern als Matte ausgestaltet sein kann. Bei diesen Tastenkappen ist eine Be- und Entlüftung der innerhalb der Tastkappen bestehenden Schaltkammern 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 key fields. With these keycaps, ventilation of the switching chambers inside the keycaps is absolutely necessary when the keycap is pressed in. This can be done by directly exiting the air into the atmosphere or by ventilating into other switching chambers under pressure equalization.

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 Schaltkammer eingezogen werden. Erfolgt dagegen die Be- und 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 pushbutton switch. The disadvantage of this system is that dust and moisture are drawn into the switching chamber when the air directly escapes into the atmosphere due to the following suction effect. If, on the other hand, ventilation takes place in the other switching chambers, no dust and no moisture can penetrate. However, the actuation force of the key switch in this switching chamber is changed by the occurrence of the air cushion and associated pressure change, so that it can lead to incorrect keying.

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. There are ventilation holes next to the pushbuttons for ventilation. The air under the snap disks is not discharged, but acts as an air spring to generate a restoring force.

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 the ingress of dust and moisture is prevented.

Gelöst wird die Aufgabe durch die im kennzeichnenden Teil des Patentanspruchs 1 enthaltenen Merkmale.The object is achieved by the features contained in the characterizing part of patent claim 1.

Dadurch, daß jede Schaltkammer getrennt nach außen be- und entlüftet wird, erfolgt keine Beeinflussung der Betätigungskräfte. Auch wird eine Verschmutzung des Schaltsystems verhindert.Because each switching chamber is separately ventilated to the outside, there is no influence on the actuation forces. Contamination of the switching system is also 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 will be explained in more detail using an exemplary embodiment with a drawing.

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 schematically shows a key switch 1 with a dome-shaped key cap 2, which can be pressed onto a contact foil 3 by a key (not shown) and thereby 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 keypad consisting of many key switches, the key cap 2 then consisting of a so-called key mat 5. An existing under the key cap 2 switching chamber 6 is connected to the atmosphere through a ventilation channel 7, so that the air in the switching chamber 6 can flow out during operation and 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 has an air-permeable filter layer 8, so that dust and moisture can no longer enter or be sucked into the switching chamber 6.

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 is formed by openings 9, 10 of the contact film 3 and a carrier 11, a filter fleece 12 forming the filter layer 8 being arranged between the contact film 3 and the carrier 11.

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 in 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, ie each switching chamber has its own ventilation channel.

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 spaced switching chambers, if a plurality of switching chambers 6 are connected to the ventilation channel 7 via a connecting channel (not shown) arranged in a key cap mat 5 having a plurality of key caps 2. As a result, several openings 9, 10 in the contact film 3 or the carrier 11 can be omitted. The filter layer 8 or the filter fleece 12 located between the contact film 3 and the carrier 11 is advantageously dust and moisture repellent. It preferably has a 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, is 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 no contamination of the contacts and the contact pill 4 can occur.

Die vorgeschlagene Ausführung läßt sich vorteilhaft in einer Großserienfertigung herstellen.The proposed embodiment can advantageously be produced in large series.

Claims (5)

Tastschalter mit einer domförmigen Tastenkappe, die von einer Taste auf eine Kontaktfolie gedrückt wird und mit einer Kontaktpille Kontakte kurzschließt, wobei die unter der Tastenkappe bestehende Schaltkammer über einen Belüftungskanal mit der Atmosphäre verbunden ist, dadurch gekennzeichnet, daß der Belüftungskanal (7) eine luftdurchlässige Filterschicht (8) aufweist.Push button switch with a dome-shaped button cap, which is pressed by a button on a contact foil and short-circuits contacts with a contact pill, the switching chamber existing under the button cap being connected to the atmosphere via a ventilation channel, characterized in that the ventilation channel (7) has an air-permeable filter layer (8). Tastschalter nach Anspruch 1, dadurch gekennzeichnet, 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.Pushbutton switch according to Claim 1, characterized in that the ventilation channel (7) is formed by openings (9, 10) in the contact film (3) and a carrier (11), the filter layer (between the contact film (3) and carrier (11) 8) forming filter fleece (12) is arranged. Tastschalter nach Anspruch 2, dadurch gekennzeichnet, daß die Durchbrüche (9, 10) der Kontaktfolie (3) und des Trägers (11) im Bereich der Schaltkammer (6) bestehen.Push button switch according to claim 2, characterized in that the openings (9, 10) of the contact film (3) and the carrier (11) exist in the region of the switching chamber (6). Tastschalter nach Anspruch 2, dadurch gekennzeichnet, daß mehrere Schaltkammern (6) über einen Verbindungskanal in einer mehrere Tastenkappen (2) aufweisenden Tastenkappenmatte (5) mit dem Belüftungskanal (7) verbunden sind.Pushbutton switch according to Claim 2, characterized in that a plurality of switching chambers (6) are connected to the ventilation duct (7) via a connecting channel in a keycap mat (5) having a plurality of keycaps (2). Tastschalter nach Anspruch 2, 3 oder 4, dadurch gekennzeichnet, daß das Filtervlies (12) staub- und feuchtigkeitsabweisend ist.Push button switch according to claim 2, 3 or 4, characterized in that the filter fleece (12) is dust and moisture repellent.
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 true EP0795882A2 (en) 1997-09-17
EP0795882A3 EP0795882A3 (en) 1999-01-20
EP0795882B1 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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US9997304B2 (en) 2015-05-13 2018-06-12 Apple Inc. Uniform illumination of keys
US10424446B2 (en) 2015-05-13 2019-09-24 Apple Inc. Keyboard assemblies having reduced thickness and method of forming keyboard assemblies
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Publication number Priority date Publication date Assignee Title
CN113257603A (en) * 2021-06-17 2021-08-13 昆山兴协和科技股份有限公司 Membrane switch

Also Published As

Publication number Publication date
DE19608773A1 (en) 1997-09-11
DE19608773C2 (en) 1998-11-26
EP0795882B1 (en) 2004-03-17
DE59711404D1 (en) 2004-04-22
EP0795882A3 (en) 1999-01-20
ES2214561T3 (en) 2004-09-16
US5874700A (en) 1999-02-23

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