Hook-shaped piezoelectric actuator

摘要

A piezoelectric actuator has a metal sheet including a first base portion (4) and a second portion (6) bent by 90 degrees with respect to the base portion (4) and ending with an end free edge (11) acting as driving member for driving a driven body (not shown). A pair of piezoelectric elements (8, 9) are applied to the two portions (4, 6) of the sheet (3) and are supplied separetely with alternated voltages which are 90 degrees out of phase relative to each other, so as to impart a hellipsoidal movement to the above mentioned free end edge (11).