| 摘要 |
PROBLEM TO BE SOLVED: To provide a piezoelectric actuator substrate for a liquid ejection head which is hardly brought into a contact state with a signal transmission part performing connection with the outside, and to provide a liquid ejection head using the piezoelectric actuator substrate for a liquid ejection head, and a recorder.SOLUTION: A plurality of displacement elements 50 have a pair of electrodes (common electrode 34 and surface electrode 35) along a diaphragm 21a, and a piezoelectric ceramic layer 21b put between the pair of electrodes. One electrode of the pair of electrodes is the surface electrode 35 which is exposed to the surface of the piezoelectric actuator substrate 21 and whose average thickness is 3 μm or smaller. The surface electrode 35 of one displacement element 50 includes a surface electrode body 35a existing at a portion to be bent and deformed, and a lead-out electrode 35b led out from the surface electrode body 35a. A projection 35a-1 whose height is 3 μm or more exists on the surface of the surface electrode body 35a. |
