| 摘要 |
<p>Torsional actuator (10), comprising monolithic piezoelectric ceramic, which is arranged as a plurality of layers one on top of the other, having electrodes (22, 23, 24) at least between the layers (20) and externally accessible head contacts (30 to 34) for connecting the electrodes (22, 23, 24) to electrical control voltages, at least for twisting the actuator (10) about its longitudinal axis (16), the electrodes (22, 23, 24) terminating parallel and at a distance from the edges of the mutually parallel piezoelectric layers (20), being interrupted along the longitudinal axis (16) and having grouped connection surfaces which project as far as the edges of the piezoelectric layers (20) and are there directly provided with laterally arranged head contacts (30 to 34) so that, relative to the central lines (19, 39) of the end face (18), the respective first adjoining electrode in the first and fourth or second and third quadrant is at positive potential and the remainder are at negative potential, with respect to a reference voltage of a central electrode (22) if the adjoining layers (20) are polarised orthogonally and parallel with respect to the electrode (22). <IMAGE></p> |
