Patent ID: 8124897
Filing Date: 2012-02-28
Classification: G06F,H01H,H03K

Abstract:
1. An input unit for electrotechnical devices, having components operable with a human finger for electromechanical and/or electronic generation of input signals for a controlled actuation of an electrotechnical device based on these generated input signals, comprising: a rigid circuit board; a cover suited for capacitive field movement, said cover mounted on said circuit board, said cover transparent in at least selected locations, said cover comprising a contact surface for contact at more than one single location; a sensor film, wherein said sensor film is a transparent ITO film directly beneath said cover, said sensor film comprising a resistance structure that is contactable via three contact points and that responds in a continually capacitive manner as a function of a then current location of a contact of the cover by a human finger and that sets a respective corresponding resistivity that is measurable at the three contact points, wherein said resistivity can be used to generate a respectively associated input signal for the electrotechnical device for its respective corresponding actuation; switchable light-emitting diodes arranged on the circuit board in selected locations in a switchable manner by means of electronics on the circuit board; a transparent key pad located between the sensor film and the circuit board and under the sensor film; and a metal dome or poly dome film under said keypad, wherein the dome is assigned to an electrical contact on the circuit board and the dome is mechanically actuatable via the cover in such a manner that when actuating the dome the respectively assigned electrical contact on the circuit board is actuated, and that in the metal dome or poly dome film there are provided recesses that are assigned to the respective light-emitting diodes on the circuit board in such a manner that illumination by the light-emitting diodes of selected transparent locations of the cover is ensured through the transparent key pad and the transparent sensor film.