The invention relates to an actuator (1), which can be moved from a starting position into a working position, and which has at least one actuator element (2) that can be changed with respect to its dimensions by way of an electrical signal, and in particular is made of a dielectric elastomer or a shape-memory alloy. At least two restoring means (20, 30) acting on the actuator element are provided for the movement into the working position, in particular a non-linear snap spring (20) and a linear helical spring (30). By way of the restoring means, a total restoring means characteristic curve, which is composed of portions of the individual, preferably prestressed restoring means and a portion of variable rigidity of the actuator element, can be advantageously tailored.
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