Piezo-electric device type actuator

A piezoelectric device type actuator, comprising:

• a pre-compressed laminated piezoelectric device including a plural number of laminated piezoelectric ceramics layers, a plural number of internal electrodes sandwiched between the respective piezoelectric ceramics layers, a first external electrode connected to alternate ones of said external electrodes, and a second external electrode connected to the other alternate ones of said internal electrodes, said pre-compressed piezoelectric device having first and second side surfaces on the opposite lateral sides thereof, and further said pre-compressed piezoelectric device being pre-compressed with a predetermined compressive force;
• a stationary base member;
• a pair of resilient plates extended along the first and second side surfaces of said pre-compressed piezoelectric device, respectively, and each welded at one end to said base member;
• a movable block welded to the other end of each of said resilient plates;
• a first block interposed between said base member and one end of said laminated piezoelectric device, and securely welded to one end of each of said pair of resilient plates;
• and
• a second block interposed between said movable block and the other end of said laminated piezoelectric device, and securely welded to the other end of each of said pair of resilient plates.