| 摘要 |
PROBLEM TO BE SOLVED: To provide a small laminated piezoelectric actuator device with a low manufacturing cost having a jacket structure which is not affected by an external humidity. SOLUTION: Related to the laminated piezoelectric actuator device 6, a pair of external lead terminals 3 is connected to an external electrode 4 positioned on one end side of a laminated piezoelectric actuator element 1 where the external electrode 4 is provided to the side surface of a laminated body having a piezoelectric ceramics layer and an internal electrode layer laminated, and the almost entire side surface of the laminated piezoelectric actuator element 1 expect for the connection point for the external lead terminal 3 is covered with a glass tube 2 as a jacket part. Here, a closed space is provided between the laminated piezoelectric actuator element 1 and the glass tube 2, and a part of the glass tube 2 corresponding to the closed space is provided with a corrugated deformed part 2a of 3 stages, as a displacement absorption part for absorbing displacement (extension) of the laminated piezoelectric actuator element 1.
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