PIEZOELECTRIC ACTUATOR UNIT

摘要

PROBLEM TO BE SOLVED: To provide a piezoelectric actuator in a piezoelectric actuator unit having means for extending a service life.SOLUTION: A piezoelectric actuator unit A includes: a piezoelectric actuator 1; and a filling material 7 surrounding the piezoelectric actuator 1. The filling material 7 contains thermoplastic polyester, and is disposed in a sleeve 8 containing a material that is bonded with the filling material 7 and generates no cavities if possible between the filling material 7 and the material.