The actual growth of high-technologies and future applications in micro- and nano-manufacturing have raised the
need for low cost / high performance micro-positioners. Photonic packaging, optical device testing, MEMS
positioning/alignment, fiber alignment, micromachining, micro-manipulation, semiconductor handling systems,
microsurgery are some examples of applications, from which the most are in the optical field. Very often, micro-positioning systems with micron or submicron resolution m needed to be run open loop, without feedback position
sensors. Such devices are achievable with strain actuators like piezoelectric, magnetostrictive or electrostrictive ones.
Two kinds of actuators could be used, with continuous motion or with discrete motion. The first could reach all the
points from a space but request real time control. The second could reach only a finite number of points in space, but
the command is binary, easy to implement. The working space for discrete actuators can be reached using a lot of
actuators, series connected. The paper presents a piezoelectric actuator with 3 DOF, that could be used for micro-positioning. The investigated actuator is a scale model, for checking the principle and the models.