EP1301936B1 - Switch device for an electrical appliance - Google Patents

Switch device for an electrical appliance Download PDF

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Publication number
EP1301936B1
EP1301936B1 EP01960322A EP01960322A EP1301936B1 EP 1301936 B1 EP1301936 B1 EP 1301936B1 EP 01960322 A EP01960322 A EP 01960322A EP 01960322 A EP01960322 A EP 01960322A EP 1301936 B1 EP1301936 B1 EP 1301936B1
Authority
EP
European Patent Office
Prior art keywords
electrically conductive
switching
conductive layer
switching device
protective element
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
EP01960322A
Other languages
German (de)
French (fr)
Other versions
EP1301936A1 (en
Inventor
Joachim Spratte
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.)
Continental Automotive GmbH
Original Assignee
Siemens VDO Automotive 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 VDO Automotive AG filed Critical Siemens VDO Automotive AG
Publication of EP1301936A1 publication Critical patent/EP1301936A1/en
Application granted granted Critical
Publication of EP1301936B1 publication Critical patent/EP1301936B1/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
    • H01H2221/00—Actuators
    • H01H2221/07—Actuators transparent
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2239/00—Miscellaneous
    • H01H2239/008—Static electricity considerations
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2239/00—Miscellaneous
    • H01H2239/01—Miscellaneous combined with other elements on the same substrate

Definitions

  • the invention relates to a switching device for an electrical device with a longitudinally displaceable, provided for depressing button, with an elastic, a range with spaced apart held electrical contacts limiting switching mat and with a protective element against electrostatic discharge, wherein the switching element for connection to a mass part the electrical device is provided.
  • the protective element is designed as arranged in front of the switching mat sheet. In the area of the button, the sheet has a recess. With an electrostatic charging of the user, voltages of up to 25 kV can arise, which are derived from the metal sheet into the mass of the electrical device. As a result, damage to electronic components of the electrical device is prevented.
  • Such a switching device is from the document GB-A-2102626 known.
  • a disadvantage of the known switching device is that the sheet is a very expensive to manufacture and to be mounted component.
  • the invention is based on the problem of designing a switching device of the type mentioned above so that it is particularly inexpensive to manufacture.
  • the protective element has an electrically conductive layer arranged on the side of the switching mat facing the push-button.
  • the protective element By applying the protective element on the safety mat, the protection against electrostatic discharge during assembly of the safety mat is automatically generated. This eliminates the separate mounting of the protective element. Furthermore, the layer can be particularly cost-effective in the manufacture of the switching mat compared to the sheet metal part. As a result, the switching device according to the invention designed particularly cost. Another advantage of the invention is that the protective element requires a particularly small space.
  • the electrically conductive layer has conductive lacquer or contact ink.
  • a conductive lacquer or such contact ink is usually used as a contact within the switching mats and contains particles with an intended electrical conductivity, such as graphite.
  • the electrically conductive layer could, for example, as the sheet of the known protective element have a very low electrical resistance. However, this leads to the fact that the electrical discharge for the user of the switching device according to the invention is associated with a noticeable electric shock. A perceptible to the user electric shock can be avoided according to another advantageous embodiment of the invention, when the electrically conductive Layer has a high electrical resistance compared to metal.
  • An electrostatic discharge is derived according to another advantageous embodiment of the invention particularly reliable if the probe has an electrically conductive layer in at least one subregion.
  • FIG. 1 shows a switching device 1 with a longitudinally displaceably guided in a diaphragm button 2.
  • the switching device 1 is a single of many side by side in a keyboard for a computer or an entertainment device used switching devices. To simplify the drawing of a grounded housing 3 of the keyboard or entertainment device, a portion of a wall is shown.
  • the switching device 1 has a diaphragm 4 and arranged at a distance from the diaphragm 4 printed circuit board 5.
  • On the circuit board 5 electrical contacts 6 and a switching mat 7 are arranged with a further electrical contact 8.
  • the contacts 8 of the switching mat 7 and the circuit board 5 are opposite each other.
  • the switching mat 7 is made of a rubber-elastic material and in the drawn position, in which the contacts 6, 8 are spaced from each other, biased. As a result, the button 2 is held in its drawn position at the same time.
  • the switching mat 7 When the button 2 is pressed down, the switching mat 7 is deformed and its contact 8 is moved against the contacts 6 of the printed circuit board 5. Furthermore, 5 electronic components 9 are arranged on the circuit board, which monitor the bridging of the contacts 6, 8 and generate an electronic signal. The electronic components 9 are also arranged below the switching mat 7.
  • the switching mat 7 On its side facing the pushbutton 2, the switching mat 7 has a protective element 10 with an electrically conductive layer 11.
  • the electrically conductive layer 11 is used as a conductive lacquer or as a contact ink, as used, for example, for the electrical contact 8 arranged on the switching mat 7, educated. Furthermore, the electrically conductive layer 11 is connected via a metal spring 12 to the housing 3. An electrostatic discharge generated upon contact of the probe 2 reaches the electrically conductive layer 11 and is discharged from there into the housing 3.
  • FIG. 2 shows a switching device 13 in which a push-button 14 and a switching mat 15 have a recess 16. In the region of the recess 16 designed as a LED light source 17 is arranged.
  • the button 14 can be illuminated by this.
  • the switching mat 15 has an electrically conductive layer 18.
  • a portion of the button 14 also has an electrically conductive layer 19.
  • the electrically conductive layers together form a protective element 20 for dissipating an electrostatic charge.
  • An electrostatic discharge is like the switching device 1 derived from Figure 1. Otherwise, the switching device 13 is formed substantially like that of Figure 1.
  • the probe is made of an electrically conductive material or painted with an electrically conductive material. A direct electrical connection of this conductive material with the switching mat is not required if the zwichen the switching mat and the conductive material existing gap is made sufficiently small.

Landscapes

  • Push-Button Switches (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)
  • Selective Calling Equipment (AREA)
  • Control Of Electric Motors In General (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Elimination Of Static Electricity (AREA)

Abstract

A contact element (1) for an electrical device has an electrically conductive coating (11) deposited on a switching mat (7), whereby electrostatic discharge transmitted to a key (2) will be deflected by the electrically conductive coating (11) into the casing (3) of the electrical device.

Description

Die Erfindung betrifft eine Schalteinrichtung für ein elektrisches Gerät mit einem längsverschieblich geführten, zum Niederdrücken vorgesehenen Taster, mit einer elastischen, einen Bereich mit auf Abstand zueinander gehaltenen elektrischen Kontakten begrenzende Schaltmatte und mit einem Schutzelement vor elektrostatischer Entladung, wobei das Schaltelement zur Verbindung mit einem Masseteil des elektrischen Gerätes vorgesehen ist.The invention relates to a switching device for an electrical device with a longitudinally displaceable, provided for depressing button, with an elastic, a range with spaced apart held electrical contacts limiting switching mat and with a protective element against electrostatic discharge, wherein the switching element for connection to a mass part the electrical device is provided.

Solche Schalteinrichtungen werden insbesondere bei Tastaturen für Computer oder Geräte der Unterhaltungsindustrie häufig eingesetzt und sind aus der Praxis bekannt. Das Schutzelement ist dabei als vor der Schaltmatte angeordnetes Blech gestaltet. Im Bereich des Tasters hat das Blech eine Ausnehmung. Bei einer elektrostatischen Aufladung des Benutzers können Spannungen von bis zu 25 kV entstehen, die von dem Blech in die Masse des elektrischen Gerätes abgeleitet werden. Hierdurch wird eine Beschädigung von elektronischen Bauteilen des elektrischen Gerätes verhindert.Such switching devices are often used in particular for keyboards for computers or devices of the entertainment industry and are known in practice. The protective element is designed as arranged in front of the switching mat sheet. In the area of the button, the sheet has a recess. With an electrostatic charging of the user, voltages of up to 25 kV can arise, which are derived from the metal sheet into the mass of the electrical device. As a result, damage to electronic components of the electrical device is prevented.

Eine solche Schalteinrichtung ist aus dem Dokument GB-A-2102626 bekannt.Such a switching device is from the document GB-A-2102626 known.

Nachteilig bei der bekannten Schalteinrichtung ist, dass das Blech ein sehr kostenintensiv zu fertigendes und zu montierendes Bauteil ist.A disadvantage of the known switching device is that the sheet is a very expensive to manufacture and to be mounted component.

Der Erfindung liegt das Problem zugrunde, eine Schalteinrichtung der eingangs genannten Art so zu gestalten, dass sie besonders kostengünstig zu fertigen ist.The invention is based on the problem of designing a switching device of the type mentioned above so that it is particularly inexpensive to manufacture.

Dieses Problem wird erfindungsgemäß dadurch gelöst, dass das Schutzelement eine auf der dem Taster zugewandten Seite der Schaltmatte angeordnete elektrisch leitfähige Schicht aufweist.This problem is solved according to the invention in that the protective element has an electrically conductive layer arranged on the side of the switching mat facing the push-button.

Durch die Aufbringung des Schutzelementes auf der Schaltmatte wird der Schutz gegen elektrostatische Entladung bei der Montage der Schaltmatte automatisch erzeugt. Hierdurch entfällt die separate Montage des Schutzelementes. Weiterhin lässt sich die Schicht im Vergleich zu dem Blechteil besonders kostengünstig bei der Fertigung der Schaltmatte aufbringen. Hierdurch gestaltet sich die erfindungsgemäße Schalteinrichtung besonders kostengünstig. Ein weiterer Vorteil der Erfindung ist, dass das Schutzelement einen besonders geringen Bauraum erfordert.By applying the protective element on the safety mat, the protection against electrostatic discharge during assembly of the safety mat is automatically generated. This eliminates the separate mounting of the protective element. Furthermore, the layer can be particularly cost-effective in the manufacture of the switching mat compared to the sheet metal part. As a result, the switching device according to the invention designed particularly cost. Another advantage of the invention is that the protective element requires a particularly small space.

Zur weiteren Verringerung der Fertigungskosten der erfindungsgemäßen Schalteinrichtung trägt es bei, wenn die elektrisch leitfähige Schicht leitfähigen Lack oder Kontakttinte aufweist. Solch ein leitfähiger Lack oder solche Kontakttinte wird meist innerhalb der Schaltmatten als Kontakt verwendet und enthält Partikel mit einer vorgesehenen elektrischen Leitfähigkeit, wie beispielsweise Graphit.To further reduce the manufacturing costs of the switching device according to the invention, it is beneficial if the electrically conductive layer has conductive lacquer or contact ink. Such a conductive lacquer or such contact ink is usually used as a contact within the switching mats and contains particles with an intended electrical conductivity, such as graphite.

Die elektrisch leitfähige Schicht könnte beispielsweise wie das Blech des bekannten Schutzelementes einen sehr geringen elektrischen Widerstand haben. Dies führt jedoch dazu, dass die elektrische Entladung für den Benutzer der erfindungsgemäßen Schalteinrichtung mit einem spürbaren elektrischen Schlag verbunden ist. Ein für den Benutzer spürbarer elektrischer Schlag lässt sich gemäß einer anderen vorteilhaften Weiterbildung der Erfindung vermeiden, wenn die elektrisch leitfähige Schicht einen im Vergleich zu Metall hohen elektrischen Widerstand hat.The electrically conductive layer could, for example, as the sheet of the known protective element have a very low electrical resistance. However, this leads to the fact that the electrical discharge for the user of the switching device according to the invention is associated with a noticeable electric shock. A perceptible to the user electric shock can be avoided according to another advantageous embodiment of the invention, when the electrically conductive Layer has a high electrical resistance compared to metal.

Eine elektrostatische Entladung wird gemäß einer anderen vorteilhaften Weiterbildung der Erfindung besonders zuverlässig abgeleitet, wenn der Taster in zumindest einem Teilbereich eine elektrisch leitfähige Schicht aufweist.An electrostatic discharge is derived according to another advantageous embodiment of the invention particularly reliable if the probe has an electrically conductive layer in at least one subregion.

Die Erfindung lässt zahlreiche Ausführungsformen zu. Zur weiteren Verdeutlichung ihres Grundprinzips sind zwei davon in der Zeichnung dargestellt und werden nachfolgend beschrieben. Diese zeigt in

Fig.1
eine Schnittdarstellung durch eine erfindungsgemäße Schalteinrichtung,
Fig.2
eine Schnittdarstellung durch eine erfindungsgemäße, eine Beleuchtung aufweisende Schalteinrichtung.
The invention allows numerous embodiments. To further clarify its basic principle, two of them are shown in the drawing and will be described below. This shows in
Fig.1
a sectional view through a switching device according to the invention,
Fig.2
a sectional view through a lighting device according to the invention, switching device.

Figur 1 zeigt eine Schalteinrichtung 1 mit einem in einer Blende längsverschieblich geführten Taster 2. Die Schalteinrichtung 1 ist ein einzelnes von vielen nebeneinander in einer Tastatur für einen Computer oder ein Unterhaltungsgerät eingesetzte Schalteinrichtungen. Zur Vereinfachung der Zeichnung ist von einem geerdeten Gehäuse 3 der Tastatur oder des Unterhaltungsgerätes ein Teilbereich einer Wandung dargestellt. Die Schalteinrichtung 1 hat eine Blende 4 und eine mit Abstand zur der Blende 4 angeordnete Leiterplatte 5. Auf der Leiterplatte 5 sind elektrische Kontakte 6 und eine Schaltmatte 7 mit einem weiteren elektrischen Kontakt 8 angeordnet. Die Kontakte 8 der Schaltmatte 7 und der Leiterplatte 5 stehen einander gegenüber. Die Schaltmatte 7 ist aus einem gummielastischen Material gefertigt und in der eingezeichneten Stellung, in der die Kontakte 6, 8 voneinander beabstandet sind, vorgespannt. Hierdurch wird gleichzeitig der Taster 2 in seiner eingezeichneten Stellung gehalten.Figure 1 shows a switching device 1 with a longitudinally displaceably guided in a diaphragm button 2. The switching device 1 is a single of many side by side in a keyboard for a computer or an entertainment device used switching devices. To simplify the drawing of a grounded housing 3 of the keyboard or entertainment device, a portion of a wall is shown. The switching device 1 has a diaphragm 4 and arranged at a distance from the diaphragm 4 printed circuit board 5. On the circuit board 5 electrical contacts 6 and a switching mat 7 are arranged with a further electrical contact 8. The contacts 8 of the switching mat 7 and the circuit board 5 are opposite each other. The switching mat 7 is made of a rubber-elastic material and in the drawn position, in which the contacts 6, 8 are spaced from each other, biased. As a result, the button 2 is held in its drawn position at the same time.

Bei einem Niederdrücken des Tasters 2 wird die Schaltmatte 7 verformt und ihr Kontakt 8 gegen die Kontakte 6 der Leiterplatte 5 bewegt. Weiterhin sind auf der Leiterplatte 5 elektronische Bauteile 9 angeordnet, die das Überbrücken der Kontakte 6, 8 überwachen und ein elektronisches Signal erzeugen. Die elektronischen Bauteile 9 sind ebenfalls unterhalb der Schaltmatte 7 angeordnet. Auf ihrer dem Taster 2 zugewandten Seite hat die Schaltmatte 7 ein Schutzelement 10 mit einer elektrisch leitfähigen Schicht 11. Die elektrisch leitfähige Schicht 11 ist als leitfähiger Lack oder als Kontakttinte, wie sie beispielsweise für den auf der Schaltmatte 7 angeordneten elektrischen Kontakt 8 verwendet wird, ausgebildet. Weiterhin ist die elektrisch leitfähige Schicht 11 über eine Metallfeder 12 mit dem Gehäuse 3 verbunden. Eine bei Berührung des Tasters 2 erzeugte elektrostatische Entladung gelangt bis zu der elektrisch leitfähigen Schicht 11 und wird von dort aus in das Gehäuse 3 abgeleitet.When the button 2 is pressed down, the switching mat 7 is deformed and its contact 8 is moved against the contacts 6 of the printed circuit board 5. Furthermore, 5 electronic components 9 are arranged on the circuit board, which monitor the bridging of the contacts 6, 8 and generate an electronic signal. The electronic components 9 are also arranged below the switching mat 7. On its side facing the pushbutton 2, the switching mat 7 has a protective element 10 with an electrically conductive layer 11. The electrically conductive layer 11 is used as a conductive lacquer or as a contact ink, as used, for example, for the electrical contact 8 arranged on the switching mat 7, educated. Furthermore, the electrically conductive layer 11 is connected via a metal spring 12 to the housing 3. An electrostatic discharge generated upon contact of the probe 2 reaches the electrically conductive layer 11 and is discharged from there into the housing 3.

Figur 2 zeigt eine Schalteinrichtung 13, bei der ein Taster 14 und eine Schaltmatte 15 eine Ausnehmung 16 aufweisen. Im Bereich der Ausnehmung 16 ist eine als LED ausgebildete Lichtquelle 17 angeordnet. Der Taster 14 lässt sich hierdurch beleuchten. Die Schaltmatte 15 hat eine elektrisch leitfähige Schicht 18. Ein Teilbereich des Tasters 14 hat ebenfalls eine elektrisch leitfähige Schicht 19. Die elektrisch leitfähigen Schichten bilden zusammen ein Schutzelement 20 zur Ableitung einer elektrostatischen Aufladung. Eine elektrostatische Entladung wird wie bei der Schalteinrichtung 1 aus Figur 1 abgeleitet. Ansonsten ist die Schalteinrichtung 13 im Wesentlichen wie die aus Figur 1 ausgebildet.FIG. 2 shows a switching device 13 in which a push-button 14 and a switching mat 15 have a recess 16. In the region of the recess 16 designed as a LED light source 17 is arranged. The button 14 can be illuminated by this. The switching mat 15 has an electrically conductive layer 18. A portion of the button 14 also has an electrically conductive layer 19. The electrically conductive layers together form a protective element 20 for dissipating an electrostatic charge. An electrostatic discharge is like the switching device 1 derived from Figure 1. Otherwise, the switching device 13 is formed substantially like that of Figure 1.

Es ist auch möglich, daß der Taster aus einem elektrisch leitfähigen Material hergestellt oder mit einem elektrisch leitfähigen Material lackiert wird. Eine direkte elektrische Verbindung dieses leitfähigen Materials mit der Schaltmatte ist nicht erforderlich, wenn der zwichen der Schaltmatte und dem leitfähigen Material bestehende Spalt ausreichend klein ausgeführt ist.It is also possible that the probe is made of an electrically conductive material or painted with an electrically conductive material. A direct electrical connection of this conductive material with the switching mat is not required if the zwichen the switching mat and the conductive material existing gap is made sufficiently small.

Claims (3)

  1. Switching device for an electrical appliance with a key which is disposed in a longitudinally displaceable manner and intended for pressing down, with a flexible switching mat, bounding a region with electrical contacts which are kept at a distance from one another, and with a protective element, guarding against electrostatic discharge, the protective element being intended for connection to a frame part of the electrical appliance, characterized in that the protective element (10, 20) has arranged on the side of the switching mat (7, 15) facing the key (2, 14) an electrically conductive layer (11, 18, 19), which comprises a conductive lacquer or contact ink.
  2. Switching device according to claim 1, characterized in that the electrically conductive layer (11, 18, 19) has a high electrical resistance in comparison with metal.
  3. Switching device according to at least one of the preceding claims, characterized in that the key (14) has in at least one partial region an electrically conductive layer (19).
EP01960322A 2000-07-18 2001-06-16 Switch device for an electrical appliance Expired - Lifetime EP1301936B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10034771 2000-07-18
DE10034771A DE10034771A1 (en) 2000-07-18 2000-07-18 Switching device for an electrical device
PCT/EP2001/006828 WO2002007177A1 (en) 2000-07-18 2001-06-16 Switch device for an electrical appliance

Publications (2)

Publication Number Publication Date
EP1301936A1 EP1301936A1 (en) 2003-04-16
EP1301936B1 true EP1301936B1 (en) 2007-12-26

Family

ID=7649236

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01960322A Expired - Lifetime EP1301936B1 (en) 2000-07-18 2001-06-16 Switch device for an electrical appliance

Country Status (8)

Country Link
US (1) US6580043B1 (en)
EP (1) EP1301936B1 (en)
JP (1) JP2004504695A (en)
CN (1) CN1443359A (en)
AT (1) ATE382186T1 (en)
AU (1) AU2001281845A1 (en)
DE (2) DE10034771A1 (en)
WO (1) WO2002007177A1 (en)

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Also Published As

Publication number Publication date
DE50113419D1 (en) 2008-02-07
EP1301936A1 (en) 2003-04-16
WO2002007177A1 (en) 2002-01-24
US6580043B1 (en) 2003-06-17
JP2004504695A (en) 2004-02-12
ATE382186T1 (en) 2008-01-15
AU2001281845A1 (en) 2002-01-30
CN1443359A (en) 2003-09-17
DE10034771A1 (en) 2002-01-31

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