PIEZOELECTRIC ACTUATOR, LENS BARREL, AND OPTICAL APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a piezoelectric actuator which can achieve stable driving and size reduction.

SOLUTION: The piezoelectric actuator includes: a first piezoelectric element 18 which is displaced in a first direction; a driving member 22 which is coupled with the first piezoelectric element; a second piezoelectric element 20 which includes an opening 20a allowing the driving member to penetrate therethrough in the first direction and is displaced in the direction crossing the first direction; and drive control parts 56, 66 for outputting drive signals by which the first and second piezoelectric elements are displaced so that a relative position to the driving member in the first direction of the second piezoelectric element is changed.

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