Patent ID: 11878525
Assignee: SEIKO EPSON CORPORATION
Field: Textile and paper machines (Mechanical engineering)
Classification: CPC B | IPC B

Claim 14:
15. A liquid ejection head comprising:
a channel-formed substrate in which a plurality of pressure chambers communicating with nozzles are arranged side by side;
a vibration plate on one surface of the channel-formed substrate; and
a piezoelectric actuator including a first electrode, a piezoelectric layer, and a second electrode laminated on a surface of the vibration plate remote from the pressure chambers,
wherein the piezoelectric actuator includes, in a first direction in which the pressure chambers are arranged side by side, an active portion in which the piezoelectric layer is sandwiched between the first electrode and the second electrode in a first area of the vibration plate corresponding to opposite ends of each pressure chamber and does not include the active portion in a second area of the vibration plate corresponding to a center of each pressure chamber,
wherein the vibration plate has, in the first direction, a thick-walled portion with a predetermined thickness in the first area and a thin-walled portion thinner than the thick-walled portion in the second area, and
wherein the piezoelectric layer is thinner at a portion facing the thin-walled portion of the vibration plate than at another portion.