An actuator for applying an actuating force through a total displacement. The actuator includes: an actuator body; n piezo members supported by the body where n is an integer greater than or equal to two, each of the piezo members generating a force and a displacement upon application of a voltage thereon; and n-1 levers rotatably disposed in the body and each having first and second ends corresponding to two of the n piezo members such that the displacements of the n piezo members are accumulated to generate the total displacement at the nth piezo member. Preferably, at least one of the n-1 levers are rotatably disposed in the body such that the displacement from one of the n piezo members acting on the first end of the at least one of the n-1 levers is amplified at the second end of the at least one of the n-1 levers.