Control mechanism for an electrical appliance and evaluation method for the control mechanism

摘要

A control mechanism for an electrical appliance comprises a deformable or elastic control panel, for example, embodied as a frame of an electric cooking hob. Several piezo sensor elements are arranged under the control panel. The piezo sensor elements are arranged on the rear side of a printed circuit board, the opposite front side of said printed circuit board being arranged or fastened to the underside of the control panel in a planar manner. By determining the difference of the signals of the sensor elements arranged next to each other, it is possible to accomplish an extremely good and safe evaluation of a location where a finger is placed with light pressure on the control panel.

主权项

1. A control mechanism for an electrical appliance comprising:
a control panel that is deformable or elastic, whereby at least one piezo sensor element is arranged under said control panel, wherein the at least one piezo sensor element is arranged on the rear side of a printed circuit board with the opposing front side of said printed circuit board attached or fastened in a planar manner to the underside of the control panel, wherein said at least one piezo sensor element comprises a piezo ceramic disk that is bonded to a metal membrane, said piezo sensor element having a planar electrical connection on its upper side, as well as on its underside, wherein contact pads with contact leads connected thereto are provided on the printed circuit board, and said at least one piezo sensor element is fastened in a planar manner for electrical contact on the connecting field to the printed circuit board in an electrically conductive manner, and wherein the piezo ceramic disk faces the printed circuit board and is in direct contact therewith as a one-sided contact instead of as a two-sided contact.