Patent ID: 11945221
Assignee: TOSHIBA TEC KABUSHIKI KAISHA
Field: Textile and paper machines (Mechanical engineering)
Classification: CPC B | IPC B

Claim 8:
9. A liquid ejection head, comprising:
an actuator including a piezoelectric element comprising a lead-free piezoelectric material;
a pressure chamber configured to change volume with the vibration of the piezoelectric element;
a driving circuit configured to apply a voltage to the actuator to vibrate the piezoelectric element in a first direction to expand the pressure chamber using a first electric field with a positive polarization direction of the piezoelectric element and then to contract the pressure chamber using a second electric field with a negative polarization direction, the second electric field being less than or equal to a coercive electric field for the piezoelectric element; and
a nozzle fluidly connected to the pressure chamber, wherein
the piezoelectric element comprises a plurality of layers of the lead-free piezoelectric material stacked on each other, and
a piezoelectric constant d33 of the lead-free piezoelectric material is at least 200 pC/N at a steady state.