To create an actuator IPU uses the piezoelectric properties of certain crystals, which undergo mechanical deformation when electrical voltage is applied.
This actuator is composed of two main mechanisms: A pole connected to a plate containing the piezoelectric crystal and the electrical connections as detailed in figure 1.
A metal spring tightened to the pole and capable to move on the pole as detailed in figure 2.
When electrical voltage is applied on the crystal a deformation occurs on the plate and moves the pole along the axis that is perpendicular to the deformed surface (Z).
If multiple pulses are applied the pole will move along the Z axis as described in figure 3.