Piezoelectric actuator and method of manufacture therefor, and ink jet head and ink jet type recording device

摘要

A piezoelectric actuator 21 has: a piezoelectric actuator part 22 made up of a common electrode 27 , a piezoelectric element 29 , and an individual electrode 33 ; an electrical interconnection joint part 43 formed on the individual electrode 33 ; an electrical interconnection 45 formed on the electrical interconnection joint part 43 ; a head block 47 fixed to a nozzle plate 39 through the electrical interconnection 45 ; and a PI tape 49 disposed within the head block 47 . A closed space 57 is defined between the head block 47 and the nozzle plate 39 . The closed space 57 is divided by the PI tape 49 into two sections. Of these two sections of the closed space 57 , the one on the side of the head block 47 constitutes a first closed space 57 a. A moisture absorbent 52 is sealed within the first closed space 57 a. Relative humidity within the closed space 57 of the ink jet head 1 is not less than 0% nor more than 20%.