| 摘要 |
PROBLEM TO BE SOLVED: To provide a piezoelectric actuator unit that prevents thermal damage to molding resin and a sleeve, that favorably maintains solder connection even when there is a temperature rise in a usage environment, and that prevents cracks in a piezoelectric material due to stress concentration at the time of start-up.SOLUTION: A piezoelectric actuator unit comprises: a plurality of piezoelectric elements 30 that are laminated in a direction in which voltage is applied; guides 20 that house the piezoelectric elements 30; external electrodes 33 that are provided on side surfaces of each piezoelectric element 30; and thread solder 50 that connects the external electrodes 33. The thread solder 50 and the external electrodes 33 are connected with solder 60. The solder 60 contains In and/or Bi, and the contained In and/or Bi diffuse into the thread solder 50. |
