Abstract:
The invention relates to an actuator body, comprising a plurality of piezoceramic layers (4), which are separated from each other by means of a positive or negative internal electrode (2, 3) in alternation, positive and negative collecting electrodes (9, 10), which are arranged on two outer faces of the actuator body and are conductively connected to the associated positive or negative internal electrodes, wherein the actuator body of the multilayer actuator (1) has at least one positive and one negative contacting electrode (7, 8), by means of which the multilayer actuator is electrically contacted and which is conductively connected to the associated positive or negative collecting electrode, and the contacting electrodes are arranged in areas (12, 13; 16, 17) of the actuator body that are provided with a base metallization. The areas of the actuator body provided with a base metallization are spaced apart from each other (14, 18) and distances (15, 19) from the internal electrodes, wherein the distances are not less than the thickness of the piezoceramic layers in the active area of the multilayer actuator.
Abstract:
The invention relates to a device for creating a haptic feedback of keyless input units like "touch screens" or "keypads" in mobile IT-devices like mobile phones, PDA's, music or multimedia players, cameras, navigation devices and so on. The market requests a device that can create a haptic signal for a touch screen in a way, such that the display is moved as a whole substantially perpendicular to the housing surface in at least one direction. In order to achieve said aim, the invention provides a device for creation a haptic feedback of a keyless input unit, wherein the device comprises an elastic, substantially plate-shaped substrate, comprising at least one first support point for establishing the substrate on a structure of the input device and at least one second support point for establishing the substrate at the input unit, designed in a way such that the input unit is displaceably housed in relation to the structure of the input device, wherein a piezoelectric element is arranged between the first and second support points of the substrate in a way, such that one of the support points is moved transversal to the plane of the plate-shaped substrate during an electric control of the piezoelectric element.