A mechanical force switch to be disposed along a longitudinal device axis of a medical device includes an electrically conductive switching piston to form a first electrical contact of the switch, a hollow body, an end stop, a bias device, and an electrically conductive second contact of the switch electrically insulated from the piston. The piston is movably disposed in the body hollow along the axis to define different switch-making and -breaking position. The piston is also movably disposed in a cavity of the stop and the stop is disposed in the body. The stop can be a smooth or threaded puck. The bias device surrounds the piston and imparts bias against it to retain it in one of the two positions until an external axis force overcomes the bias, at which time the switch indicates a state changeover. The switch can be normally open or closed.

A mechanical force switch to be disposed along a longitudinal device axis of a medical device includes an electrically conductive switching piston to form a first electrical contact of the switch, a hollow body, an end stop, a bias device, and an electrically conductive second contact of the switch electrically insulated from the piston. The piston is movably disposed in the body hollow along the axis to define different switch-making and -breaking position. The piston is also movably disposed in a cavity of the stop and the stop is disposed in the body. The stop can be a smooth or threaded puck. The bias device surrounds the piston and imparts bias against it to retain it in one of the two positions until an external axis force overcomes the bias, at which time the switch indicates a state changeover. The switch can be normally open or closed.

Bei einer Folientastatur kreuzen sich in einer Schaltkammer 4 streifenförmige Leitbeläge 5, 6. Zur Vermeidung von Kurzschlüssen sind die gegenüberliegenden Flächen der Leitbeläge 5, 6 bezogen auf die Schaltkammerfläche klein gehalten. Es steht der Leitbeleg 5 bzw. 6 der oberen bzw. unteren Trägerfolie 2, 1 außer an den Kreuzungsstellen 10 nur solchen Bereichen der unteren bzw. oberen Trägerfolie 1, 2 gegenüber, die von Leitbelag frei sind.

The present invention discloses a key device for a mobile phone, which comprises a printed circuit board (PCB), a key disposed on the PCB and a metal dome disposed above the key. The metal dome is able to make electrical contact with the key. The key comprises a first electrode, a second electrode and a third electrode, and the third electrode is formed as two rings in which the first electrode and the second electrode are disposed respectively. The first electrode and the second electrode are electrically connected with each other to adapt to different key positions of different types of mobile phones. The metal dome is disposed to have the third electrode and the first electrode make electrical contact with each other or have the third electrode and the second electrode make electrical contact with each other. In the key device for a mobile phone provided by the present invention, the key is formed with three electrodes, so when the metal dome makes contact with the first electrode or the second electrode, the three electrodes of the key are electrically connected with each other simultaneously. This imparts the key for a mobile phone with the compatibility, thereby reducing the product cost and shortening the duration of research and development.

Rechteckförmiger Kontaktträger (1) für Tastaturen mit den einzelnen Tasten zugeordneten, aus einander gegenüberliegenden Kontaktbahnen (3, 4) aufgebauten Kontaktfeldern (2).

Die die Kontaktstellen bildenden Kontaktbahnen (3, 4) sollen so gestaltet werden, daß bei der Herstellung des Kontaktträgers (1) im Siebdruckverfahren auch bei Auftreten von Fertigungstoleranzen die Ausschußrate gering gehalten wird.

Dies wird dadurch erreicht, daß -bezogen auf einen Randbereich des Kontaktträgers (1) die Kontaktbahnen (3, 4) im Kontaktbereich parallel und unter einem Winkel von ₄5° zueinander angeordnet sind. Dadurch wird der Abstand der Kontaktbahnen (3, 4) im Kontaktbereich erheblich vergrößert, ohne daß die Abmessungen des Kontaktfeldes (2) geändert werden.