| 摘要 |
PROBLEM TO BE SOLVED: To provide a liquid ejection head that reduces stress concentration of piezoelectric elements and can suppress breakage of the piezoelectric elements, and to provide a liquid ejection device.SOLUTION: A liquid ejection head comprises: a flow path formation substrate 10 on which pressure generating chambers 12 communicating with nozzle openings are arranged side by side along a short side direction; and piezoelectric elements 300 that are provided corresponding to the pressure generating chambers at one surface side of the flow path formation substrate and have first electrodes 60, piezoelectric layers 70 provided on the first electrodes and second electrodes 80 provided on the piezoelectric layers. The second electrodes are continuously provided over a direction in which the pressure generating chambers are arranged side by side while the first electrodes are being independently provided corresponding to the pressure generating chambers. In a direction intersecting with the direction in which the pressure generating chambers are arranged side by side, low dielectric layers 200 having permittivity lower than those of central portions of active portions are provided between the first electrode and the second electrode at active portion sides of at least one boundaries of the boundaries between the active portions 320 of the piezoelectric layers for substantively driving and non-active portions 330 of the piezoelectric layers for not substantively driving. |
