LIQUID PUMP HAVING A PIEZOELECTRIC MEMBER AND INKJET APPARATUS HAVING THE SAME

摘要

A liquid pump includes a piezoelectric pump unit and a control unit. The piezoelectric pump unit includes an inlet, an outlet, and a chamber formed between the inlet and the outlet, and a wall of the chamber includes a piezoelectric member. The control unit is configured to apply to the piezoelectric member, a first voltage in a polarization direction of the piezoelectric member and a second voltage in a direction opposite to the polarization direction, such that the piezoelectric member is deformed. The first voltage is greater than the second voltage.

主权项

1. An inkjet apparatus, comprising:
a head configured to discharge liquid through a plurality of nozzles; a tank includes a first chamber into which the liquid is recovered from the head and a second chamber from which the liquid is supplied to the head; a circulation unit positioned between the head and the tank and including liquid passages by which the liquid is circulated from the tank to the head and then back to the tank, the circulating unit having a piezoelectric pump unit including an inlet, an outlet, and a chamber formed between the inlet and the outlet, a wall of the chamber including a piezoelectric member; a heating unit configured to heat the circulated liquid; and a control unit configured to cause the piezoelectric member to be deformed, by applying voltages to the piezoelectric member.