Abstract: A method for driving an optical lens system having a first and a second group of optical lenses movable along a linear path parallel to an optical axis by a first and second motor, respectively, and a drive unit, comprises reading (S2, S4) of a present position of the groups and communicating (S6) it to the drive unit. In the drive unit, a command representing a requested optical zoom degree and/or a requested focusing distance is received (S10). Requested positions of the groups, corresponding to the received command, are deduced (S20) by utilizing predetermined lens positioning data available in the drive unit. The predetermined lens positioning data represents positions of the groups causing different combinations of optical zoom degree and focusing distance. The motors are driven (S30, S32) to move the groups to the respective requested positions. The driving comprises applying (S31, S33) of voltage signals over electromechanical materials.

Abstract: A manufacturing method for an electromechanical drive element comprises providing (S10) of an excitation body comprising at least one volume of electromechanical material. The excitation body has a metal plate integrated as a surface of the excitation body. The excitation body being arranged to cause shape changes of the electromechanical material and the metal plate when the volume(s) of electromechanical material being excited by a voltage signal. A composite drive pad is provided (S20). The composite drive pad comprises a metal portion directly joined to a ceramic portion. After the providing of a composite drive pad, the metal portion of the composite drive pad is irreversibly attached (S30) to the metal plate of the excitation body by use of a metal-based bond. An electromechanical drive element and an electromechanical motor using such an electromechanical drive element are also disclosed.

Abstract: An electromechanical motor (1) comprises a stator (2) and a translator (10). The stator has two electromechanical actuators (20) having electromechanically active material (26) and means (35) for providing exciting signals. The translator is arranged between, and in driving contact with, driving portions (22) of the electromechanical actuators. The stator has a spring element (30) arranged for holding the driving portions against the translator. The electromechanical actuators are arranged for providing a vibration, which gives rise to a driving action, directed in a driving direction (X) perpendicular to the direction of the normal force, against the surface of the translator. The electromechanical motor further comprises a guiding means (50) having a circular hole (52). The translator has a cylindrically shaped guidance part (16) arranged at least partly in the circular hole. A tunable high-frequency filter comprising such a motor is also disclosed.