1. An apparatus for charging a piezoelectric element (10, 20, 30, 40, 50 or 60), characterized in that an activation voltage and an activation charge value for driving the piezoelectric element (10, 20, 30, 40, 50 or 60) is controlled online by a control unit (D) which: (a) adjusts the activation voltage (U) and activation charge values in
order to compensate for deviations caused by variations in the piezoelectric element's (10, 20, 30, 40, 50 or 60) layer thickness or the number of layers; and (b) determines the activation voltage and the activation charge value as a
function of a correction factor, the correction factor measured in accordance with a manufacturing process.
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