Liquid ejection head, liquid ejection apparatus, and method for controlling liquid ejection head

Abstract

A liquid ejection head configured to eject a liquid from an ejection port while moving in a predetermined direction includes: an ejection unit including an ejection element for generating energy for ejecting the liquid from the ejection port, a pressure chamber communicating with the ejection port, an individual supply channel for supplying the liquid to the pressure chamber, an individual collection channel for collecting the liquid from the pressure chamber, and a liquid sending element disposed between the individual supply channel and the individual collection channel and configured to send the liquid from the individual supply channel to the individual collection channel; and a circulation unit fluidly connected to the ejection unit and configured to circulate the liquid in a common supply channel for commonly supplying the liquid to a plurality of the individual supply channels, wherein the circulation unit is driven on demand based on a predetermined condition determination.

Dependencies are inferred from the claim text.