Patent ID: 8890839
Filing Date: 2014-11-18
Classification: H03K

Abstract:
1. A capacitive proximity sensor comprising: a display field having at least one transparent region; a first printed circuit board arranged on a first side of the display field facing away from an observer, the first printed circuit board being translucent at least in a region corresponding to the at least one transparent region of the display field; a second printed circuit board arranged at a distance from the first printed circuit board and substantially parallel to the first printed circuit board; capacitance-forming sensor layers; light shafts arranged to surround the sensor layers on the side facing away from the observer and project between the first printed circuit board and the second printed circuit board; light sources arranged corresponding to the light shafts on the second printed circuit board; a contact element arranged from the first printed circuit board to the second printed circuit board; first optical waveguides applied to a side of the first printed circuit board facing the display field corresponding to the at least one transparent region of the display field; a functional opaque plastic carrier, having a same thickness as the first optical waveguides, that encapsulates the first side of the first printed circuit board, omitting regions corresponding to the first optical waveguides, and forms light shafts on a side of the carrier facing away from the observer; and an opaque decorative layer that covers the first optical waveguides and the functional carrier on the observer side defining apertures forming at least one of characters and symbols in the region corresponding to the transparent region of the display field, wherein the second printed circuit board is fastened to a side of the functional carrier that faces away from the observer.